Web Applications for Sharing Teacher PC Screen to Student PCs via WebRTCTatsuma Okuda; Michitoshi Niibori; Hiroshi Noguchi; Yasuhiro Ohtaki; Masaru Kamada, Last, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224, 20 Sep. 2024,
[Reviewed] A Web AR Application to Practice DrumsAsahi Onuki; Galang Prihadi Mahardhika; Michitoshi Niibori; Masaru Kamada, Last, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224,, 20 Sep. 2024,
[Reviewed] An Evaluation of Implementation Options for Web-Based Interactive AnimationsShusuke Okamoto; Masaki Kohana; Masaru Kamada, Last, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224,, 20 Sep. 2024,
[Reviewed] Proposal of a State Diagram-Based Programming Paradigm for Embedded DevicesErjing Zhou; Keigo Takayasu; Masaru Kamada; Shusuke Okamoto, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224, 20 Sep. 2024,
[Reviewed] Improvement of Graphical User Interface of IslayTabYuta Niinami; Erjing Zhou; Michitoshi Niibori; Masaki Kohana; Shusuke Okamoto; Masaru Kamada, Last, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224, 20 Sep. 2024,
[Reviewed] A Web-Based Math Graph Art Tool for Understanding Quadratic FunctionsHironao Iwase; Erjing Zhou; Michitoshi Niibori; Masaru Kamada, Last, Springer Nature Switzerland
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 27th International Conference on Network-Based Information Systems, NBiS-2024), Lecture Notes on Data Engineering and Communication Technologies 224, 20 Sep. 2024,
[Reviewed] A semiautonomous drone system for inspecting structures
Yuta Sato; Masaru Kamada; Munehiro Takimoto and Yasushi Kambayashi
The 29th International Symposium on Artificial Life and Robotics (AROB 2024), 26 Jan. 2024, [Reviewed]
Certificate service for unboxing video images
Kenshin Miyamoto Michitoshi Niibori and Masaru Kamada, Last, Springer
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 26th International Conference on Network-Based Information Systems, NBiS-2023), Lecture Notes on Data Engineering and Communication Technologies 183, 06 Sep. 2023, [Reviewed]
A JavaScript library for user interface by tapping smartphone bodies
Shunsuke Takano; Michitoshi Niibori and Masaru Kamada, Last, Springer
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 26th International Conference on Network-Based Information Systems, NBiS-2023), Lecture Notes on Data Engineering and Communication Technologies 183, 06 Sep. 2023, [Reviewed]
An early warning system by PoseNet for pedestrians
Taichi Tsukahara; Yudai Okui; Michitoshi Niibori and Masaru Kamada, Last, Springer
L. Barolli (Ed.), Advances in Networked-Based Information Systems, (Proceedings of the 26th International Conference on Network-Based Information Systems, NBiS-2023), Lecture Notes on Data Engineering and Communication Technologies 183, 06 Sep. 2023, [Reviewed]
Web application with built-in remote support capability by means of voice communication and screen sharing
Shinya Nakamura; Michitoshi Niibori and Masaru Kamada, Last, Springer
L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems, (Proceedings of the 25th International Conference on Network-Based Information Systems, NBiS-2022), Lecture Notes in Networks and Systems 526, 07 Sep. 2022, [Reviewed]
Evaluation of information aggregation performance of PPN-integrated networks by changing the interval for input part switching
Yudai Okui; Tatsuhiro Yonekura and Masaru Kamada, Last, Springer
L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems, (Proceedings of the 25th International Conference on Network-Based Information Systems, NBiS-2022), Lecture Notes in Networks and Systems 526, 07 Sep. 2022, [Reviewed]
Integrating PPN into autoencoders for better information aggregation performance
Yudai Okui; Tatsuhiro Yonekura and Masaru Kamada, Last, Springer
L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems, (Proceedings of the 24th International Conference on Network-Based Information Systems, NBiS-2021), Lecture Notes in Networks and Systems 313, 31 Aug. 2021, [Reviewed]
An AR system to practice drums
Kaito Kikuchi; Michitoshi Niibori and Masaru Kamada, Last, Springer
L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems, (Proceedings of the 24th International Conference on Network-Based Information Systems, NBiS-2021), Lecture Notes in Networks and Systems 313, 31 Aug. 2021, [Reviewed]
A SPA of online lecture contents with voice
Masaki Kohana; Shusuke Okamoto and Masaru Kamada, Last, Springer
L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems, (Proceedings of the 24th International Conference on Network-Based Information Systems, NBiS-2021), Lecture Notes in Networks and Systems 313, 31 Aug. 2021, [Reviewed]
A web-based attendance management system with NFC seat identifiersKohei Takahashi; Michitoshi Niibori and Masaru Kamada, Last, Springer
In: L. Barolli et al. (Eds.), Advances in Networked-Based Information Systems (Proceedings of the 23rd International Conference on Network-Based Information Systems, NBiS-2020), Advances in Intelligent Systems and Computing 1264, 28 Aug. 2020,
[Reviewed] Web service for searching Halal compliant restaurants
IMAMA; Masaki Kohana and Masaru Kamada, Last
L. Barolli et al. (eds.), Advances in Network-based Information Systems (Proceedings of the 22nd International Conference on Network-based Information Systems, NBiS-2019), Advances in Intelligent Systems and Computing 1036, Springer, 05 Sep. 2019, [Reviewed]
Implementation of interactive tutorial for IslayPub by hooking user events
Daisuke Tanaka; Masaki Kohana; Michitoshi Niibori; Yasuhiro Ohtaki; Shusuke Okamoto and Masaru Kamada, Corresponding
L. Barolli et al. (eds.), Advances in Network-based Information Systems (Proceedings of the 22nd International Conference on Network-based Information Systems, NBiS-2019), Advances in Intelligent Systems and Computing 1036, Springer, 05 Sep. 2019, [Reviewed]
A graphical front-end interface for React.js
Shotaro Naiki; Masaki Kohana; Shusuke Okamoto and Masaru Kamada, Last, Springer
In: Barolli L., Kryvinska N., Enokido T., Takizawa M. (eds) Advances in Network-Based Information Systems. NBiS 2018. Lecture Notes on Data Engineering and Communications Technologies, vol 22., 04 Sep. 2018, [Reviewed]
An attendance management system capable of mapping participants onto the seat map
Shinya Kinoshita; Michitoshi Niibori and Masaru Kamada, Corresponding, Springer
In: Barolli L., Kryvinska N., Enokido T., Takizawa M. (eds) Advances in Network-Based Information Systems. NBiS 2018. Lecture Notes on Data Engineering and Communications Technologies, vol 22., 04 Sep. 2018, [Reviewed]
Real-time web-cast system by multihop WebRTC communications
Daiki Ito; Michitoshi Niibori and Masaru Kamada, Corresponding, Inderscience Enterprises (in press)
International Journal of Grid and Utility Computing, Sep. 2018, [Reviewed]
A block-based structure editor for the English language
Osamu Goto; Michitoshi Niibori and Masaru Kamada, Corresponding, Springer
In: L. Barolli et al. (eds.), Advances in Network-based Information Systems (Proceedings of the 20th International Conference on Network-based Information Systems, NBiS-2017), Lecture Notes on Data Engineering and Communications Technologies 7, Aug. 2017, [Reviewed]
A web application for passengers to watch coming buses in rural areasYukiya Yamaguchi; Ryosuke Iiya; Michitoshi Niibori; Erjing Zhou; Masaru Kamada; Osamu Saitou and Susumu Shibusawa, Corresponding, Springer
In: L. Barolli et al. (eds.), Advances in Network-based Information Systems (Proceedings of the 20th International Conference on Network-based Information Systems, NBiS-2017), Lecture Notes on Data Engineering and Communications Technologies 7, Aug. 2017,
[Reviewed] An HTML5 implementation of Web-Com for recording chalk annotations and talk voices onto web pages
Shuji Ogawa; Michitoshi Niibori; Tatsuhiro Yonekura and Masaru Kamada, Corresponding, Springer
In: L. Barolli et al. (eds.), Advances in Network-based Information Systems (Proceedings of the 20th International Conference on Network-based Information Systems, NBiS-2017), Lecture Notes on Data Engineering and Communications Technologies 7, Aug. 2017, [Reviewed]
Sparse approximation of ion-mobility spectrometry profiles by binomial splines
Yuki Koshino and Masaru Kamada, Corresponding
Proceedings of the12th International Conference on Sampling Theory and Applications (SampTA 2017), Jul. 2017, [Reviewed]
Locally Supported Bivariate Splines in Piecewise Constant TensionMasaru Kamada and Kunimitsu Takahashi, Lead, We derive a means to construct a locally supported basis for the truly bivariate cardinal spline functions under the influence of parameter called tension being a different constant in each grid cell. First, the functions are formulated as a solution for a functional minimization problem. Then the associated differential equation is analyzed in the state-space representation to derive formulae for transitions of the state vectors. Finally, the locally supported basis, which is indispensable for practical applications, are constructed by the technique of dead-beat control of the state vectors. Adaptively varying the tension in each grid cell, we can reduce the ringing artifacts when applied to interpolation of image signals., IEEE
Proceedings of the 2016 International Conference on Advances in Electrical, Electronic and System Engineering (ICAEESE 2016), 14 Nov. 2016,
[Reviewed] Islay– An Educational Programming Tool Based on State DiagramsMasaru Kamada, Lead, This tool allows children to describe how autonomous characters in their video games should behave at the minimal cost of understanding ovals (states) and arrows (transitions). Its use in educational practices for a decade has confirmed that the tool helps children find their own talent and understand the fundamental concepts of computers such as finite state machines, concurrent processing, object classes and instances. Enthusiastic users run into the combinatorial explosion of states. Then it is the time for them to move on to the structured programming languages where they can use variables to represent states., IEEE
2016 INTERNATIONAL CONFERENCE ON ADVANCES IN ELECTRICAL, ELECTRONIC AND SYSTEMS ENGINEERING (ICAEES), 14 Nov. 2016
IslayTouch: an educational visual programming environment for tablet devicesErjing Zhou; Michitoshi Niibori; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, Educational programming languages are programming languages that have been designed for users without programming experience, with the purpose of teaching them the skill of logical thinking or as an introduction to regular programming languages. Although these languages are relatively easier for beginners, difficult concepts of regular programming languages are still being introduced into some of them. As a new approach to this problem, an educational visual programming environment called Islay has been developed, in which the concept of state-transition diagram is used to compose a program. As a result, Islay becomes even easier for beginners than some other educational programming languages. In this research, a new version of Islay is developed as an Android application, with more features being added and a new user interface that is suitable for tablet devices., INDERSCIENCE ENTERPRISES LTD
Int. J. Space-Based and Situated Computing, Nov. 2016,
[Reviewed] A university information system made robust against natural disasters by taking advantage of remotely distributed campuses
Hiroshi Noguchi; Yasuhiro Ohtaki and Masaru Kamada, Last
Int. J. Space-Based and Situated Computing, Nov. 2016, [Reviewed]
A Preliminary Experiment of Tweet Filtering by Back PropagationShumpei Fujii; Michitoshi Niibori and Masaru Kamada, Corresponding, It happens that one you are following in Twitter has several aspects in his personality. Suppose we are so attracted by his bright aspect that we are following his tweets. Then we have to endure dirty tweets from his dark side. In attempt to construct Twitter client software that filters out dirty tweets (from our point of view), we trained neural networks of different depths by the standard back propagation algorithm and tested if they can tell preferable tweets from dirty ones. The result says that the shallow network having only two hidden layers and more than 32 and 64 units per layer achieves over 96% and 97% of accuracy, respectively., IEEE
The 5th International Workshop on Web Service and Social Media (WSSM 2016), Sep. 2016,
[Reviewed] A Structure Editor for the English LanguageMarina Nakano; Emi Masuda and Masaru Kamada, Corresponding, We present a trial implementation of a structure editor for the English language. That might be the first attempt of applying the idea of structure editors, which have been quite common for the programming languages, to a natural language. This structure editor forces the writer to construct a derivation tree manually by selecting an admissible derivation rule after another and by filling a leaf node with a word. Each word is checked with a dictionary API if a (pro) noun is properly in the single or plural form, if a verb is properly inflected accordingly, and if other components such as adjective, adverb, preposition are placed at the right leaves. Then the writer gets a grammatically correct sentence together with its derivation tree. This kind of editor may be useful in writing technical documents like operating manuals that should be prepared in different natural languages because a sentence accompanied by its derivation tree may be more easily translated into other languages than a freely written sentence with its possibly wrong parse tree. At the moment, the implemented editor covers only a limited class of simple affirmative sentences., IEEE
The 5th International Workshop on Web Service and Social Media (WSSM 2016), Sep. 2016,
[Reviewed] A Handy Real-Time Location System for Community Bus ServiceRyousuke Iiya; Erjing Zhou; Michitoshi Niibori; Masaru Kamada; Osamu Saitou and Susumu Shibusawa, Corresponding, We present a handy information system for community bus services. Its main feature is that we have only to go around a new route as a test drive with a terminal device in order to collect and publish its geographic data such as the positions of the stops in the Google's general transit feed specification (GTFS) format. A template time table is recorded during the test drive which can be edited to complete a time table for publication in the GTFS format. From the bus on duty, its real-time position is uploaded in the GTFS realtime format. Those data can be accessible by the passengers through Google. It has been planned and yet to be implemented that voice announcements can be recorded during the test drive with the location data so that the announcements can be played back automatically., IEEE
The 5th International Workshop on Web Service and Social Media (WSSM 2016), Sep. 2016,
[Reviewed] Recognition of antagonistic exercise using a depth image sensor
Sheik Arick Hasan; Kazuki Kamata; Toshiya Watanabe; Susumu Shibusawa; Masaru Kamada; Tatsuhiro Yonekura; and Minoru Yamada
International Journal of Advances in Electronics and Computer Science, Apr. 2016, [Reviewed]
Recognition of antagonistic exercise using a depth image sensor
Sheik Arick Hasan; Kazuki Kamata; Toshiya Watanabe; Susumu Shibusawa; Masaru Kamada; Tatsuhiro Yonekura; and Minoru Yamada
Proceedings of the 25th International Conference on Recent Innovations in Engineering and Technology (ICRIET), 20 Feb. 2016, [Reviewed]
A Real-TimeWeb-Cast System for Classes in the BYOD StyleDaiki Ito; Michitoshi Niibori; Masaru Kamada, A real-time web-cast system for classes in the BYOD (Bring Your Own Device) style is presented. The teacher starts up our server application software to keep capturing the screens and the voices. The student PCs will be organized in the shape of a binary tree in the following steps. Each student lets his browser connect to the teacher's PC with its FQDN or IP address. The first comer becomes the root that receives screen images and voices directly from the teacher's PC by the WebSocket protocol. Two browsers newly coming in become child nodes of the root or an existing leaf node from which they receive screens and voices by the WebRTC protocol. It is advantageous especially for the classes in the BYOD style because no students are required to install anything other than a browser into the PCs in advance. It is even possible to host students outside the classroom since the teacher's voices are delivered to their PCs., IEEE
PROCEEDINGS OF 2016 19TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS), 2016,
[Reviewed] Design and practice of file backup system taking advantage of remotely distributed campusesHiroshi Noguchi; Yasuhiro Ohtaki and Masaru Kamada, We present a file backup system designed for a university on the basis of its experiences with the 2011 east Japan earthquake. This system has two levels of security: (1) The web site for public relations and the e-mail systems for communications that will work continuously even in the case of commercial power failure. (2) The personal computer systems that will be down during power failure but will restart working without any loss of data as soon as the power supply is back. The former has been implemented by employing a private cloud computing platform and a public one in combination. To the latter, the same cloud-computing approach was not applicable because it causes latency and extra cost of communications in the normal time to keep the frequently accessed data in a cloud storage. Fortunately, this particular university has three campuses so far away that one may be destroyed by a single disaster but the other two will survive. Taking advantage of the remote campuses, we designed and implemented a file storage system that keeps the original copy on-premise in a campus and its backup copy in one of the other two campuses. Its operations have shown that the communication traffic among the campuses increased only by half in order to keep the data safe against natural disasters., IEEE
The 4th International Workshop on Web Service and Social Media (WSSM 2015), Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] Web-based location sharing service for a group of people to get togetherShuji Ogawa; Michitoshi Niibori and Masaru Kamada, A web service is developed which enables a group of people to share their locations for the purpose of getting together. This service is accessible through any web browsers capable of HTML5, JavaScript, Ajax and Geolocation API on the smartphones. It does not require installation of any special application software. The system has been implemented by using the Geolocation API and Ajax. In any occasion of a group gathering, the group members can start and continue sharing their real-time locations by this service until they finally get together., IEEE
The 4th International Workshop on Web Service and Social Media (WSSM 2015), Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] Development of IslayPub3.0 – Educational programming environment based on state-transition diagramsKazuomi Suzuki; Michitoshi Niibori; Adnan Saleh Rashed; Shusuke Okamoto and Masaru Kamada, An enhanced version of IslayPub is developed in this study. IslayPub is an educational programming environment available on any browsers capable of HTML5 and JavaScript. Its unique feature is to describe the behavior of automatic characters in terms of state-transition diagram visually easy to understand even for children. The former version did not offer the functions of publishing what they created and receiving likes and comments from others. In this paper, we enhance IslayPub to include those two functions which will give more fun and motivation to the children., IEEE
The 4th International Workshop on Web Service and Social Media (WSSM 2015), Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] A software framework for internet of thingsTakahiro Inui; Masaki Kohana; Shusuke Okamoto aand Masaru Kamada, This paper describes a software framework for building the Internet of Things widget with Raspberry Pi. This framework utilizes an interactive animation authoring tool called 'Islay,' which generates an interactive animation written in a programming language. A generated program for Raspberry Pi runs without any operating system. It is a bootable program, which uses hardware timer interrupt by itself. This paper gives an overview of the framework, some description of Raspberry Pi, and its mechanism of timer interrupt as well as a preliminary evaluation of a program using timer interrupt., IEEE
The 4th International Workshop on Web Service and Social Media (WSSM 2015), Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] Library navigation system with FeliCa cards as landmarksXiao-Lei Li; Osamu Saitou; Erjing Zhou and Masaru Kamada, A library navigation system is developed to help the user reach any book in the library. The FeliCa cards are used as landmarks to acquire the user's location instead of the GPS, which is not available indoor, or expensive indoor markers like the beacon devices. The user is supposed to have an Android device on which the developed application software runs to (1) allow the user to search for a book in the library catalogue system, (2) show the map of library indicating the location of the book, (3) get the current location of the user when the user touches a FeliCa card posted on each book shelf with the device, and (4) show the route from the current location to the book location on the map. This system navigates the user to the destination as long as he touches the FeliCa on the nearest shelf every time he is lost in the library., IEEE
The 4th International Workshop on Web Service and Social Media (WSSM 2015), Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] IslayTouch: An educational visual programming environment based on state-transition diagrams that runs on Android devicesErjing Zhou; Shusuke Okamoto; Michitoshi Niibori; Masaru Kamada and Tatsuhiro Yonekura, Educational programming languages are programming languages that have been designed for beginners, with the purpose of teaching them the skill of logical thinking or as an introduction to regular programming languages. Although these languages are relatively easier for beginners, difficult concepts of regular programming languages are still being introduced into some of them. As a new approach to this problem, an educational visual programming environment called Islay has been developed. Due to the adoption of the simple concept of state-transition diagram, Islay becomes even easier for beginners than some other educational programming languages. In this research, a new version of Islay is developed as an Android application, with more features being added and a new user interface that is suitable for tablet devices., IEEE
Proceedings of the 18th International Conference on Network-Based Information Systems (NBiS 2015), 02 Sep. 2015,
[Reviewed] Design and development of lower limb chair exercise support system with depth sensor
Toshiya Watanabe; Naohiro Ohtsuka; Susumu Shibusawa; Masaru Kamada and Tatsuhiro Yonekura
Transactions on Networks and Communications, Aug. 2015, [Reviewed]
Bivariate splines in piecewise constant tensionKunimitsu Takahashi and Masaru Kamada, Lead, We derive a means to construct a locally supported basis for the truly bivariate cardinal spline functions under the influence of parameter called tension being a different constant in each grid cell. First, the functions are formulated as a solution for a functional minimization problem. Then the associated differential equation is analyzed in the state-space representation to derive formulae for transitions of the state vectors. Finally, the locally supported basis, which is indispensable for practical applications, are constructed by the technique of dead-beat control of the state vectors. Adaptively varying the tension in each grid cell, we can reduce the ringing artifacts when applied to interpolation of image signals., IEEE
The 11th International Conference on Sampling Theory and Applicationsa (SampTA 2015), May 2015,
[Reviewed] 歩行者の位置に応じて情報を正対表示するシステム
須藤翔太; 小玉駿; 福田貴大; 渋沢進; 鎌田賢; 米倉達広
電子情報通信学会論文誌(A), 01 Jan. 2015, [Reviewed]
Design of lower limb chair exercise support system with depth sensorToshiya Watanabe; Naohiro Ohtsuka; Susumu Shibusawa; Masaru Kamada and Tatsuhiro Yonekura, Sustaining lower limb functionality is extremely important in the preventative care of the elderly. Chair exercise, in which the exerciser sits on an ordinary chair, offers a way for seniors with little physical strength to exercise without a great deal of effort. Meanwhile, Microsoft's Kinect sensor that is capable of detecting human motion without the subject having to wear any kind of a special marker are becoming widely available. Exploiting this new sensor technology, this paper describes the development and deployment of a prototype lower limb chair exercise support system that takes full advantage of the Kinect depth sensor. The system supports five different chair exercises designed to strengthen the lower limbs, recognizes and evaluates exercises based on 3D position data and joint angles for each joint obtained from the Kinect sensor. The system illustrates how to do the exercises by voice instructions and model images, and superimposes the muscles used onto an image of the exerciser in real time. The system also provides exercise assessment results and advice by voice and text. In a series of trials involving seven elderly subjects in their late 70s and early 80s, an overall average recognition rate of 89% was obtained for the five exercises., IEEE
The 11th IEEE International Conference on Ubiquitous Intelligence and Computing (UIC 2014), ,Bali, Indonesia, Dec. 2014,
[Reviewed] Motion detection and evaluation of chair exercise support system with depth image sensorToshiya Watanabe; Naohiro Ohtsuka; Susumu Shibusawa; Masaru Kamada and Tatsuhiro Yonekura, Sustaining lower limb functionality is extremely important in the preventative care of the elderly. Chair exercise, in which the exerciser sits on an ordinary chair, offers a way for seniors with little physical strength to exercise without a great deal of effort. Meanwhile, Microsoft's Kinect sensor that is capable of detecting human motion without the subject having to wear any kind of a special marker are becoming widely available. Exploiting this new sensor technology, this paper describes the development and deployment of a prototype lower limb chair exercise support system that takes full advantage of the Kinect depth sensor. The system supports five different chair exercises designed to strengthen the lower limbs, recognizes and evaluates exercises based on 3D position data and joint angles for each joint obtained from the Kinect sensor. The system illustrates how to do the exercises by voice instructions and model images, and superimposes the muscles used onto an image of the exerciser in real time. The system also provides exercise assessment results and advice by voice and text. In a series of trials involving seven elderly subjects in their late 70s and early 80s, an overall average recognition rate of 89% was obtained for the five exercises. Feedback was obtained through a questionnaire given to five male subjects ranging in age from 50 to 65, which highlighted a number of issues that should be addressed to improve the effectiveness of the system., IEEE
The International Workshop on Future Trends in Computing System Technologies and Applications (FUSION 2014), ,Bali, Indonesia, Dec. 2014,
[Reviewed] BCPとしての学内データセンターの設置とその活用方針
野口宏; 大瀧保広; 鎌田賢
学術情報処理研究, 17 Sep. 2014, [Reviewed]
NeighborNote : An Evernote application with capability of suggesting related notes based on user operation historyYuki Takahashi; Michitoshi Niibori and Masaru Kamada, This paper presents application software named NeighborNote which extends Evernote to include the capability of suggesting related notes based on the user operation history. NeighborNote calculates the relativeness between the notes based on the idea that the notes, which the user opened at the same time or copied & pasted across, may be related to one another. NeighborNote helps users find related notes by showing other notes associated with the currently open note. We have publicly released this application software as a derivative service of Evernote and are getting feedback from its users., IEEE
Proceedings of the 17th International Conference on Network-Based Information Systems (NBiS 2014), ,Salerno, Italy, 10 Sep. 2014,
[Reviewed] A business Log system to display related logs based on past cyclic events of businessYuto Yoshida; Michitoshi Niibori and Masaru Kamada, Business logs on information systems have greatly improved business efficiency. Log records can be easily found by keyword search if we only know right keywords. Further efficiency may be achieved by a system that automatically shows log records in the past related to what the user is currently doing or what is likely to happen in the near future even if the user does not notice their existence. In this paper, we develop a business log system that presents related log records of similar events taking place in a cycle in the past log., IEEE
5th International Workshop on Heterogeneous Networking Environments and Technologies (HETNET 2014), Proceedings of the 17th International Conference on Network-Based Information Systems (NBiS 2014),Salerno, Italy, 10 Sep. 2014,
[Reviewed] Interactive animation authoring platform based on state-transition diagrams that runs on Android devicesErjing Zhou; Michitoshi Niibori; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, An interactive animation is a presentation of moving pictures that behave dynamically according to the input from users. It can be composed of animation characters modeled as finite-state machines. Based on the fact that the behavior of a finite-state machine can be defined by a state-transition diagram, an interactive animation authoring tool called Islay has been developed. Islay allows users to create interactive animation simply by drawing state-transition diagrams on a GUI-based editor. Up to now Islay mainly runs on the PCs. But we cannot use it on the portable devices that have become popular recently. In this research, a new version of Islay that runs on Android devices is developed with its user interface adapted to the touch screen interface., IEEE
3rd International Workshop on Web Service and Social Media (WSSM 2014), Proceedings of the 17th International Conference on Network-Based Information Systems (NBiS 2014), Salerno, Italy, 10 Sep. 2014,
[Reviewed] File manager that shows off notes out of the filesSatoshi Kozawa; Michitoshi Niibori; Yasuhiro Ohtaki and Masaru Kamada, In the real world, sticky notes are often used to mark important pages in the documents with some notes. Sticky notes sticking out of documents are so visible that we can easily locate where the information is. Existing word-processing software is capable of managing virtual sticky notes inside the files. But we cannot see them until we open the files. In this study, we develop a file manager that enables us to see the virtual sticky notes in the Microsoft Office documents as if they are sticking out of the files. This file manager will improve the productivity of our office work., IEEE
3rd International Workshop on Web Service and Social Media (WSSSM 2014), Proceedings of the 17th International Conference on Network-Based Information Systems (NBiS 2014), Salerno, Italy, 10 Sep. 2014,
[Reviewed] A structure health monitoring system using wireless sensor
Masaru Kabashima; Shinji Nagata; Osamu Saitou; Masaru Kamada; and Yuji Kuwahara
International Symposium on Remote Sensing 2014, 17 Apr. 2014, [Reviewed]
Rapid Authoring of Web-based Multiplayer Online GamesShusuke OKAMOTO; Masaki KOHANA; Masaru KAMADA and Tatsuhiro YONEKURA, This paper describes a method for rapidly authoring multiplayer online games. The game author specifies state machines that define the behavior of game characters. The results are translated into a JavaScript code. The entire application is supported by Node.js at the server side and by modern Web browsers at the client side. Utilization of the WebSocket feature allows the communication between the Web browsers and the web server to be processed efficiently, and the player's interaction with the game interface is smooth. © 2013 ACM.
Proceedings of the 15th International Conference on Information Integration and Web-based Applications & Services, Dec. 2013,
[Reviewed] Web-based tool for programming interactive 3D animations in terms of state-transition diagramsDandy Ling Kwong; Michitoshi Niibori; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, This paper presents a tool for creating interactive 3D animations and video games in terms of state transition diagrams whose content can run on any HTML5 browser with WebGL enabled. © 2013 IEEE., IEEE Computer Society
Proc. Second International Workshop on Web Services and Social Media, Sep. 2013,
[Reviewed] Real-time water level visualization with pervasive IC sensorsOsamu SAITOU; Yuji KUWAHARA; Michitoshi NIIBORI and Masaru KAMADA, The climate change has increased heavy rain falling sporadically within a small spot of towns. It rains extremely heavily for a short time to cause local flash flood that may put lives in danger. For the purpose of early warning, we have developed a web-based system for real-time water-level visualization. This system is made up of newly developed compact water-level sensors with short-range radio, an access point to collect data from the sensors, and a web site to visualize the water level in real time. The sensor measures the water level by a pressure-sensitive device and transmits the data to the access point by the IEEE 802.15.4-compliant protocol to the access point. The access point collects data wirelessly from many sensors and uploads them to the web server. The web server renders a water-level map. © 2013 IEEE., IEEE Computer Society
Proc. Second International Workshop on Web Services and Social Media, Sep. 2013,
[Reviewed] A dynamic bus guide based on real-time bus locations -A demonstration plan-Ikuko SHIGIHARA; Akiko ARAI; Osamu SAITOU; Yuji KUWAHARA and Masaru KAMADA, Motorization liberated our life from timetables of the public transportation. As the cars became more affordable, the buses became more unpopular and less frequent. Too many cars flooding on the streets caused heavy traffic jam, which made the buses even more unpopular for their arrival got almost unpredictable. Now the bus transportation in small cities has only sparse and unreliable timetables. That forms a negative spiral for our community to keep losing efficiency in both fuel and time. Even though we cannot operate buses punctually to a fixed timetable, we can still operate them precisely relative to a dynamic timetable that is based on the location of buses actually running in real time. This dynamic timetable will be a first step toward regaining popularity for the buses and breaking the negative spiral. This paper presents our project of implementing a dynamic timetable of buses in a small city in Japan. Each bus carries an Android tablet with GPS and 3G wireless connections. The tablets transmit the bus positions to a server. The server shows the real-time bus locations on a map and also predicted future locations. Passengers can check this dynamic timetable to plan their travel., IEEE
Proc. Second International Workshop on Web Services and Social Media, Sep. 2013,
[Reviewed] A Parallelization of Interactive Animation Software with Web WorkersYuta WATANABE; Shusuke OKAMOTO; Masaki KOHANA; Tatsuhiro YONEKURA and Masaru KAMADA, Our interactive animation software is written in JavaScript, and is serial execution. However, it has a problem, which is related to drawing intervals. In case the software has to process a number of animation objects, it takes a long time. The longer drawing intervals are, the slower speed of animation playing is. So, we parallelize interactive animation software with Web Workers that is one part of HTML5. We partition drawing animation with some approaches, and parallelize their process. This time, we report the parallelization approach that takes into consideration the property of Web Workers and the interactive animation software. © 2013 IEEE., IEEE Computer Society
Proc. Second International Workshop on Web Services and Social Media, Sep. 2013,
[Reviewed] A web-based platform for clients and designers to prototype web sitesTsukasa SOUTOME; Dandy LING KWONG; Michitoshi NIIBORI and Masaru KAMADA, A web-based tool for creating web sites is presented where clients and designers work together toward their goal. It is similar to gomockingbird.com with respect to being fully online and capable of sharing half-cooked web pages among the clients and designers. The present tool is different from mockingbird with respect to the way the clients interact with the designers. We allow for dynamic components built on the web pages so that the clients can check how they dynamically look to the users. Feedback from the clients can be placed as comments on the pages so that the clients operation may not destroy the pages. This tool is written in JavaScript and HTML5., IEEE
Proc. Second International Workshop on Web Services and Social Media, Sep. 2013,
[Reviewed] Sparse approximation of ion-mobility spectrometry profiles by minutely shifted discrete B-splines
Masaru KAMADA and Masakazu OHNO
Proceedings of the 10th International Conference on Sampling Theory and Applications, Bremen, Jul. 2013, [Reviewed]
Adaptive image interpolation by cardinal splines in piecewise constant tensionSatoshi Matsumoto; Masaru Kamada; Renchin-Ochir Mijiddorj, The cardinal spline in tension is modified to allow for different tensions in different sampling intervals. Varying the tension in proportion to an index of sharp change in image brightness, we obtain image interpolation results with less ringing artifacts compared to those by the cubic spline interpolation., SPRINGER HEIDELBERG
OPTIMIZATION LETTERS, Oct. 2012,
[Reviewed] An authoring tool for Flash games in ActionScript 3.0Michitoshi NIIBORI; Yutaro ARISAWA; Shusuke OKAMOTO; Masaru KAMADA and Tatsuhiro YONEKURA, We present a tool for authoring interactive Flash games, which consists of its front-end graphical interface and a newly developed translator into Flash via Action Script3.0. The main feature is that the behaviors of characters are described in terms of state transition diagrams. Each state has a picture and activities. The picture represents appearance of the character in that state. The activities can be selected out of a set of performances such as relocation of the character and generation of other characters. A transition is conditioned in terms of events such as mouse click and collision with other characters. The graphical editor of state-transition diagrams built in this tool is so easy to manipulate that even children can compose interactive Flash games. © 2012 IEEE.
First International Workshop on Web Services and Social Media (WSSM 2012), Melbourne, 15th International Conference on Network-Based Information Systems, Sep. 2012,
[Reviewed] Authoring tool for Flash 3D animations in terms of state-transition diagramsMakoto ROKUJO; Michitoshi NIIBORI; Shusuke OKAMOTO; Masaru KAMADA and Tatsuhiro YONEKURA, A tool for authoring interactive three-dimensional animations is presented of which features are intuitive comprehensiveness of the user interface by way of state-transition diagrams and output being Flash contents that run on almost all web browsers. © 2012 IEEE.
First International Workshop on Web Services and Social Media (WSSM 2012), Melbourne, 15th International Conference on Network-Based Information Systems, Sep. 2012,
[Reviewed] 分散キャンパスを用いたファイルバックアップシステム
野口 宏; 大瀧 保広; 鎌田 賢
学術情報処理研究, Sep. 2012, [Reviewed]
Dynamic reallocation rules on multi-server web-based MORPG systemMasaki Kohana; Shusuke Okamoto; Masaru Kamada; Tatsuhiro Yonekura, The web-based-application user base has witnessed rapid growth. It has become necessary to develop techniques that enable systems to manage simultaneous access by a large number of users. We focus on web-based MultiPlayer Online Role-Playing Games (MORPGs), which must be able to cope with a large number of users and a high frequency of user requests. In our previous work, we introduced a system using multiple web servers and a dynamic data allocation method, which is able to manage dynamic change in user requests. Using this method, we achieved a capacity of 320 users, as opposed to the user capacity of 200 for single-server MORPG system. However, we found some cases in which our method was not effective. In this paper, we propose three rules for dynamic data allocation to address different situations. Our evaluation shows that the cache works effectively if the most avatars gather in a certain place. Copyright © 2012 Inderscience Enterprises Ltd.
International Journal of Grid and Utility Computing, Jul. 2012,
[Reviewed] Orthogonal exponential spline pulses with application to impulse radio
Masaru KAMADA; Semih ÖZLEM and Hiromasa HABUCHI
Sampling Theory in Signal and Image Processing, Jul. 2011, [Reviewed]
Image data compression by compact wavelets orthogonal with respect to weighted Sobolev inner product
Takashi MIYASHIMA; Masaru KAMADA; Renchin-Ochir MIJIDDORJ and Rentsen ENKHBAT
Proceedings of the International Conference on Sampling Theory and Applications 2011, Singapore, 02 May 2011, [Reviewed]
Image interpolation by cardinal splines in piecewise constant tension
Satoshi MATSUMOTO; Masaru KAMADA; Renchin-Ochir MIJIDDORJ and Rentsen ENKHBAT
Proceedings of the International Conference on Sampling Theory and Applications 2011, Singapore, 02 May 2011, [Reviewed]
Reallocation Criteria on Multi-Server Web-based MORPG SystemMasaki Kohana; Shusuke Okamoto; Masaru Kamada; Tatsuhiro Yonekura, In recent times, the web-based applications has grown rapidly and there has been an explosive increase in the number of users. Hence, it is necessary to develop technique to deal with several users. In this study, we particularly focus on web-based multiplayer online role-playing games (MORPGs), which have a large number of users and deal with high frequency of user requests. In our previous work, we introduced a method to deal with a large number of users using multiple web servers and a dynamic data allocation method to deal with dynamic change in the user request. Using our method, we achieved a user capacity of 320 for the web-based MORPG system as opposed to 200 user capacity of the single server MORPG system. However, we found some cases in which our dynamic data allocation role was not effective. In this paper, we propose three rules for our dynamic data allocation method to address various situations. We evaluate these rules using four web servers and investigate their properties and effectiveness., IEEE COMPUTER SOC
25TH IEEE INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA 2011), 2011,
[Reviewed] Evaluation of a dynamic data allocation method for web-based multi-server MORPG systemMasaki KOHANA; Shusuke OKAMOTO; Masaru KAMADA and Tatsuhiro YONEKURA, We have investigated the bottleneck in web based MORPG system and proposed a load distribution method using multiple web servers This technique uses a dynamic data allocation method called the moving home This paper describes the evaluation of our method using 4 8 16 web servers We evaluated it on both the single server system and multi server system And we confirm that the effect of the moving home through the comparison between the multi server system without the moving home and that with the moving home Our experimental result shows that the upper bound of the number of avatars in the eight server system with the moving home becomes 380 by contrast that in the single server system is 200, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE TRANSACTIONS on Information and Systems, 01 Dec. 2010,
[Reviewed] Orthogonal exponential spline pulses for impulse radio communicationsMasaru KAMADA; Semih ÖZLEM and Hiromasa HABUCHI, With application to the impulse radio communications in mind, a time-limited and zero-mean pulse which is orthogonal to its shifts by integers is sought among the exponential splines having the knot interval 1/2. An example pulse is obtained that complies with the regulation imposed by the US Federal Communications Commission and will potentially enable an impulse radio communications system as fast as 6 giga pulses per second., IEEE
Proceedings of the 36th Annual Conference of the IEEE Industrial Electronics Society, Glendale, Arizona, 09 Nov. 2010,
[Reviewed] Dynamic Data Allocation Scheme for Multi-Server Web-based MORPG SystemMasaki Kohana; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, Recently, due to the spread of broadband access to the Internet, the speeding up JavaScript on Web browsers and the development of communication technology such as Ajax, a variety of Web applications are provided. However, the access congestion to the Web server and the lower usability in case of higher frequent communication are major problems on the Web application. We have investigated the bottleneck in Web-based MORPG system and proposed the load-distribution technique using multiple Web servers[8]. This technique uses a dynamic allocation of the data, called the moving home. We proposed some rules for the moving home[9]. In this paper, we applied these rules to our MORPG system and evaluated them. © 2010 IEEE.
The 6th International Symposium on Web and Mobile Information Services (WAMIS 2010), Perth, Australia, 20 Apr. 2010,
[Reviewed] Improving bottleneck in Web-based MORPGMasaki KOHANA; Shusuke OKAMOTO; Masaru KAMADA and Tatsuhiro YONEKURA, The recent spread of broadband Internet access, speeding up of Java Script in Web browsers, and development of communications technology such as Ajax has led to the development of a variety of Web applications. The access congestion of Web servers and lower usability in the case of frequent requests are the major problems that affect the use of Web applications. In this study, we investigate the bottlenecks in single-server system. and propose a technique to improve the usability of Web-based MORPG servers., IEEE
Proceedings of 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM'09), 22 Aug. 2009,
[Reviewed] Spline interpolation in piecewise constant tension
Masaru KAMADA and Rensten ENKHBAT
CD-ROM Proceedings of the International Conference on Sampling Theory and Applications 2009, Marseille, 18 May 2009
Orthogonal exponential spline pulses with application to impulse radio
Masaru KAMADA; Semih ÖZLEM and Hiromasa HABUCHI
CD-ROM Proceedings of the International Conference on Sampling Theory and Applications 2009, Marseille, 18 May 2009, [Reviewed]
State-transition diagram for visual programming tool GUESTYuka OBU; Kazuhiro MARUO; Tatsuhiro YONEKURA; Masaru KAMADA and Shusuke OKAMOTO, Many people have been interested in Web 2.0, which is a new concept of Web service. Web sites became sources of information and functionality that enables users to create new content of their own. For this demand, more versatile browsers that enables users to edit and display content based on their creative concepts and preferences are required. Motivated by this demand, we have developed a state-transition diagram-based Web browser programming scheme that supports participatory Web use and enables end-user to interact with Web content. We implemented a prototype of our scheme called GUEST (Graphical User interface Editor by State-transition Diagram). GUEST enables users to define behaviors of a Web browser easily. However, there are some parts of complexity of user interfaces that prevent the users' intuitive understanding in the original version of GUEST. Therefore, in this paper, we focus on user interface, and introduce a new concept of the design., SPRINGER-VERLAG BERLIN
Web Information Systems and Technologies 4th International Conference, WEBIST 2008, Funchal, Madeira, Portugal, May 4-7, 2008, Revised Selected Papers, Lecture Notes in Business Information Processing (Springer), 20 Apr. 2009,
[Reviewed] ISLAY-PUB - a user-participatory service for video game creation on the web
Kazuya SHINDOME; Shusuke OKAMOTO; Tatsuhiro YONEKURA and Masaru KAMADA
International Journal of Computer Science and Network Security, 25 Jan. 2009, [Reviewed]
Real-time cheat-free gaing on the basis of time-stamp service
Shusuke MOGAKI; Masaru KAMADA; Tatsuhiro YONEKURA; Shusuke OKAMOTO; Yasuhiro OHTAKI and Mamun Bin Ibne REAZ
International Journal of Computer Science and Network Security, 25 Jan. 2009, [Reviewed]
階層構造をもつ状態遷移図に基づくロボットプログラミング環境の提案
竹原陽道; 岡本秀輔; 鎌田賢; 米倉達広
電子情報通信学会論文誌D分冊, 01 Dec. 2008, [Reviewed]
Construction of orthogonal overlapping pulses for impulse radio communicationsMasaru KAMADA; Semih ÖZLEM and Hiromasa HABUCHI, A procedure is developed to construct a time-limited pulse for its use in the short-range impulse radio communications. The even-numbered shifts of the pulse constitute a train of overlapping pulses. The pulses are intentionally made orthogonal to the second derivative of one another. This orthogonality makes it possible to detect the received pulses, which are assumed to be the second derivative of the transmitted pulses, by means of correlation with the original pulses. An example pulse is presented that complies with the FCC regulation for indoor ultra-wide bandwidth radio communications., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, , Special Section on Wideband Systems, 01 Nov. 2008,
[Reviewed] Prototyping tool for web-based multiuser online role-playing gameShusuke OKAMOTO; Masaru KAMADA and Tatsuhiro YONEKURA, This letter proposes a prototyping tool for Web-based Multiuser Online Role-Playing Game (MORPG). The design goal is to make this tool simple and powerful. The tool is comprised of a GUI editor, a translator and a runtime environment. The GUI editor is used to edit state-transition diagrams, each of which defines the behavior of the fictional characters. The state-transition diagrams are translated into C program codes, which plays the role of a game engine in RPG system. The runtime environment includes PHP, JavaScript with Ajax and HTML. So the prototype system can be played on the usual Web browser, such as Firefox, Safari and IE. On a click or key press by a player, the Web browser sends it to the Web server to reflect its consequence on the screens which other players are looking at. Prospected users of this tool include programming novices and schoolchildren. The knowledge or skill of any specific programming languages is not required to create state-transition diagrams. Its structure is not only suitable for the definition of a character behavior but also intuitive to help novices understand. Therefore, the users can easily create Web-based MORPG system with the tool., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Jun. 2008,
[Reviewed] Enhancement of web browser programming with GUEST - Visual programinng tool for non-programmers -
Yuka OBU; Kazuhiro MARUO; Tatsuhiro YONEKURA; Masaru KAMADA and Shusuke OKAMOTO
Web Information Systems and Technologies, May 2008, [Reviewed]
Wildelife net-gamekeepers using sensor networkLeoardo M. TREJOS; Masaru KAMADA; Tatsuhiro YONEKURA and Mamun Bin Ibre REAZ, Wildlife lies in vast and wide areas where human gamekeepers work as protectors. The task of recognizing poachers in protected areas is tedious, tiring, and requires huge manpower and computational overhead. A fully automated system cannot accurately identify every such poacher. This paper proposes a conceptual system based on sensor network, which will provide amusement for cyberspace gamekeepers while protecting the wildlife. For this, the sensory data from the park is mapped to a game-like virtual environment. Cyberspace gamekeepers will access the system and play the game. While playing, they will help to conserve the wildlife in national parks by pattern recognition of intruders in the game. The sensor network in the proposed system will use microphone, accelerometers and wireless transmission system.
Proceedings of the 6th Annual Workshop on Network Systems Support for Games 2007, Melbourne, Sep. 2007,
[Reviewed] Time-stamp service makes real-time gaming cheet-freeShunsuke MOGAKI; Masaru KAMADA; Tatsuhiro YONEKURA; Shusuke OKAMOTO; Yasuhiro OHTAKI and Mamun Bin Ibre REAZ, Assuming time-stamp servers that we can trust exist everywhere in the Internet, we propose a cheat-proof protocol for real-time gaming that has the minimum latency. The assumptions are: 1) Time-stamp servers are available near each player that issue serially numbered time stamps. 2) There is no communication break down between the player and the nearest time-stamp server. By this protocol, each player sends its own action to the other player and also sends its hash to the nearest time-stamp server. The time-stamp server sends back to the player the signed hash with time and a serial number involved. The signature is an undeniable evidence of the action. The actions are checked if they are compatible with the hashes and the signed hashes are checked if they have the correct time and if the serial numbers are contiguous. This verification can be done as a batch after the game is finished. The latency in this protocol is only the packet traveling time from a player to another.
Proceedings of the 6th Annual Workshop on Network Systems Support for Games 2007, Melbourne, Sep. 2007,
[Reviewed] Expert system for power quality disturbance classifierM. B. I. REAZ; F. CHOONG; M. S. SULAIMAN; F. HOHD-YASIN and Masaru KAMADA, Identification and classification of voltage and current disturbances in power systems are important tasks in the monitoring and protection of power system. Most power quality disturbances are non-stationary and transitory and the detection and classification have proved to be very demanding. The concept of discrete wavelet transform for feature extraction of power disturbance signal combined with artificial neural network and fuzzy logic incorporated as a powerful tool for detecting and classifying power quality problems. This paper employes a different type of univariate randomly optimized neural network combined with discrete wavelet transform and fuzzy logic to have a better power quality disturbance classification accuracy. The disturbances of interest include sag, swell, transient, fluctuation, and interruption. The system is modeled using VHSIC Hardware Description Language (VHDL), a hardware description language, followed by extensive testing and simulation to verify the functionality of the system that allows efficient hardware implementation of the same. This proposed method classifies, and achieves 98.19% classification accuracy for the application of this system on software-generated signals and utility sampled disturbance events., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Power Delivery, Jul. 2007,
[Reviewed] Cardinal spline pulses for impulse radio communications
Masaru KAMADA; Semih ÖZLEM and Hiromasa HABUCHI
CD-ROM of the International Workshop on Sampling Theory and Application 2007, Thessaloniki(Greece), Jul. 2007, [Reviewed]
Estimation of color images by box splines from their observation through honeycomb color filterTomoko Yokokawa; Masaru Kamada; Yasuhiro Ohtaki and Tatsuhiro Yonekura, An experimental test has been done on the suitability of box splines for the estimation of color images from their observation through the honeycomb color filter. The estimation is made by following the framework of consistent sampling by Unser and Aldroubi. Numerical evaluation of the estimation errors has shown that the best estimation may be made by choosing the box splines which are twice locally averaged along each of the three axes consisting of the unilateral triangular mesh. A close look at estimated images has indicated that those box splines are almost free from directional jaggy noises that the traditional B-splines suffer from., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Dec. 2006,
[Reviewed] Implementation of outdoor mixed reality gaming on mobile devicesYoshimichi Sasaki; Masaru Kamada and Tatsuhiro Yonekura, A system of vision-based mixed reality is developed for implementing outdoor gaming on a mobile device having a single camera and a slow CPU. To help the poor device, it is assumed that sufficiently man), marker objects of the same size are scattered in the real world so that relative translation and rotation of the camera can be easily calculated from their position and size in the camera image. This system can be applied to outdoor games of which scenario allows for existence of some items that the markers can mimic., IEEE COMPUTER SOC
Proceedings of the 2006 IEEE International Conference on Cyberworlds, Lausanne, Nov. 2006,
[Reviewed] 状態遷移図に基づくビジュアルWebブラウザプログラミングの提案
山本瑞秋; 米倉達広; 岡本秀輔; 鎌田賢; 荒木俊郎
電子情報通信学会論文誌D分冊, 01 Oct. 2006, [Reviewed]
A game authoring tool based on character definition in terms of state-transition diagramsTatsuya Shimomura; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, A tool for authoring dynamical animations and video games is presented. The logical behavior of characters such as its internal feeling and icon images representing its appearance is described as finite state machines in terms of the state-transition diagrams. The physical behavior is controlled by plug-in modules that can be optionally incorporated into the main body. An example video game is also presented. Copyright 2006 ACM.
Proceedings of the Fifth Workshop on Network and System Support for Games 2006, (NetGames 2006), Oct. 2006,
[Reviewed] Flash movie authoring environment based on state diagramMasayuki Nakagawa; Shusuke Okamoto; Masaru Kamada and Tatsuhiro Yonekura, A tool for authoring interactive Flash movies is presented. Characters that play in a movie are modeled as object definitions in terms of state-transition diagrams. Each state has a picture and activities. The picture represents appearance of the character in that state. The activities can be selected out of a set of performances such as relocation of the character and generation of other characters. A transition is conditioned in terms of events such as mouse click and collision with other characters. The graphical editor of state-transition diagrams built in this tool is so easy to manipulate that even children can compose interactive Flash animations including video games. Copyright 2006 ACM.
Proceedings of the Fifth Workshop on Network and System Support for Games 2006, (NetGames 2006), Oct. 2006,
[Reviewed] A numerical approach for solving some convex maximization problemsR. ENKHBAT; B. BARSBOLD and Masaru KAMADA, We are concerned with concave programming or the convex maximization problem. In this paper, we propose a method and algorithm for solving the problem which are based on the global optimality conditions first obtained by Strekalovsky (Soviet Mathematical Doklady, 8(1987)). The method continues approaches given in (Journal of global optimization, 8(1996); Journal of Nolinear and convex Analyses 4(1)(2003)). Under certain assumptions a convergence property of the proposed method has been established. Some computational results are reported. Also, it has been shown that the problem of finding the largest eigenvalue can be found by the proposed method., SPRINGER
Journal of Global Optimization, May 2006,
[Reviewed] Design of UWB pulses in terms of B-splinesMitsuhiro MATSUO; Masaru KAMADA and Hiromasa HABUCHI, The present paper discusses a new construction of UWB pulses within the framework of soft-spectrum adaptation., The employed basis functions are B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) The, first-order B-splines are rectangular pulses and they converge band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. Simple application of Gram-Schmidt orthonormalization process to the shifted B-splines results in a few basic pulses, which are well time-limited and have a broad band width, but do not comply with the FCC spectral mask. A constrained approximation technique is proposed for adaptively designing pulses so that they approximate target frequency characteristics. At the cost of using eleven shifted B-splines, an example set of four pulses comforting the FCC spectral mask is obtained., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Sep. 2005,
[Reviewed] Easy creation of network-based interactive animations using Islayhusuke OKAMOTO; Takahiro HASHIMOTO; Masaru KAMADA; Tatsuhiro YONEKURA, This paper describes an implementation of our tool for authoring network-based interactive animations. The toot is named Islay. The interactive animation addressed in this paper is one of computer animations whose scenario is varied according to key and mouse inputs by viewers. An animation made by the tool is constructed as a collection of characters. The behavior of a character is defined by a state-transition diagram. The GUI editor makes it possible to create a simple animation by mouse manipulation within half a minute, if the prepared pictures are used.
The animation interpreter in the tool serves multi viewers who operate each network-connected computer. The core routine of the interpreter runs on each viewer's computer in this case. The communication between the computers is implemented using our software DSM (Distributed Shared Memory) library. This paper shows the implementation details of the interpreter, as well as the brief overview of the rest of the tool., IEEE
Procedings of IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM'05), Aug. 2005
Locally supported cardial splines biorthogonal when shifted by every two knots
Mitsuhiro Matsuo; Masaru Kamada; Hiromasa Habuchi
Preprints of the 2005 International Workshop on Sampling Theory and Applications, 10 Jul. 2005
Design of UWB pulses based on B-splinesMitsuhiro MATSUO; Masaru KAMADA and Hiromasa HABUCH, The present paper discusses construction of UWB pulses on the basis of B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) They are rectangular pulses when their order is one and they converge to band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained minimization technique is proposed for designing pulses so as to comfort the FCC spectral mask and satisfy basic requirements for UWB pulses. © 2005 IEEE.
Proceedings of the IEEE International Symposium on Circuits and Systems 2005, Kobe, 23 May 2005
Design of UWB pulses based on B-splinesMitsuhiro MATSUO; Masaru KAMADA and Hiromasa HABUCH, The present paper discusses construction of UWB pulses on the basis of B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) They are rectangular pulses when their order is one and they converge to band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained minimization technique is proposed for designing pulses so as to comfort the FCC spectral mask and satisfy basic requirements for UWB pulses., IEEE
Proceedings of the IEEE International Symposium on Circuits and Systems 2005, Kobe, 23 May 2005
A Network Game based on Fair Random NumbersMasaru KAMADA; Kaoru KUROSAWA; Yasuhiro OHTAKI and Shusuke OKAMOTO, A compromising technique is proposed for deterring clients from cheating by robot players in skill-based real-time network games. This technique is to inject a fair random noise into the manual input for a real-time game modeled as a chaotic dynamical system. The fair random noise is determined by means of the bit commitment protocol so that neither host nor client can control the noise in their favor. A scenario possibly plotted by a robot player for its victory may be spoiled by slight noise injection because of the sensitivity of chaotic systems to the input. The noise injection brings a luck-based factor into a skill-based game. In this sense, the technique proposed in this paper is not a solution but a compromise for the inherent problem of robot players with the skill-based network games. An example implementation of pinball is presented. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers., Institute of Electronics, Information and Communication, Engineers, IEICE
IEICE Transactions on Information and Systems, Special Section on Cyberworlds, 01 May 2005
A Network Game based on Fair Random NumbersMasaru KAMADA; Kaoru KUROSAWA; Yasuhiro OHTAKI and Shusuke OKAMOTO, A compromising technique is proposed for deterring clients from cheating by robot players in skill-based real-time network games. This technique is to inject a fair random noise into the manual input for a real-time game modeled as a chaotic dynamical system. The fair random noise is determined by means of the bit commitment protocol so that neither host nor client can control the noise in their favor. A scenario possibly plotted by a robot player for its victory may be spoiled by slight noise injection because of the sensitivity of chaotic systems to the input. The noise injection brings a luck-based factor into a skill-based game. In this sense, the technique proposed in this paper is not a solution but a compromise for the inherent problem of robot players with the skill-based network games. An example implementation of pinball is presented., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Information and Systems, Special Section on Cyberworlds, 01 May 2005
Design of UWB pulses by Spline ApproximationMitsuhiro MATSUO; Masaru KAMADA and Hiromasa HABUCHI, The present paper discusses a new construction of UWB pulses within the framework of soft-spectrum adaptation. The employed basis functions are B-splines having the following properties: (i) The B-splines are time-limited piecewise polynomials. (ii) The first-order B-splines are rectangular pulses and they converge band-limited functions at the limit that their order tends to infinity. (iii) There are an analog circuit and a fast digital filter for the generation of B-splines. A constrained approximation technique is proposed for adaptively designing pulses so that they approximate target frequency characteristics. At the cost of using eleven shifted B-splines, an example set of four pulses comforting the FCC spectral mask is obtained., IEEE
Proceedings of the IEEE Wireless Communications and Networking Conference 2005, New Orleans, Mar. 2005
A Scheme for Partial Disclosure of Transaction LogYasuhiro OHTAKI; Masaru KAMADA and Kaoru KUROSAWA, To investigate cyber-criminals, Police sometimes asks Administrator of a computer system to disclose the whole transaction log. Administrator, however, wants to protect the privacy of innocent users. This paper presents a solution for the disclosure/privacy problem of transaction log. In this scheme, Police can search over the encrypted records of the transaction log by keywords. The administrator discloses only the records which include the keyword, but nothing more. Police can verify that the administrator faithfully disclosed all the records which include the keyword., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Jan. 2005
状態遷移図にもとづく対話型アニメーション作成ツールの提案
岡本秀輔; 鎌田賢; 中尾隆司
情報処理学会論文誌：プログラミング, Jan. 2005
A Fair Dynamical Game over NetworksMasaru KAMADA, A model of dynamical net-work game is presented that provides a fair environment for the participants without assuming any trusted parties. A game is regarded as identical discrete-time dynamical systems running individually on each participant's computer They are driven by the identical input at each discrete-time clock tick. The input is decided by the participants in the equal condition at the same time. The identity and the equality are realized by the lockstep synchronization well-established on the basis of cryptographic commitment and digital signature. A new technique that works for chaotic systems is proposed to spoil attacks by intentional delay and robot players. This technique is based on the notion of fair random noise generated out of a part of the input to be injected to the other part of the input. An example implementation of pinball is reported., IEEE COMPUTER SOC
Proceedings of the 2004 International Conference on Cyberworlds, Tokyo, 18 Nov. 2004
CSK/SSMA ALOHA System with Nonorthogonal SequencesNobuyoshi KOMURO; Hiromasa HABUCHI and Masaru KAMADA, In this paper, the CSK/SSMA ALOHA system with nonorthogonal sequences which combines the ALOHA system with Code Shift Keying (CSK) using nonorthogonal sequences is proposed. The throughput performance was evaluated by theoretical analysis. Moreover, the throughput performance of the system is compared with those of the DS/SSMA ALOHA and M-ary/SSMA ALOHA systems. It is found that the throughput performance of our system to be better than those of the other two systems., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Oct. 2004
Reconstruction of images from their observation through Bayer and honeycomb color filter arrays
Tomohide Someya; Tomoko Yokokawa and Masaru Kamada
Proceedings of the 12th European Signal Processing Conference, 07 Sep. 2004
Digital/Analog Hybrid Implementation of Cardinal Spline InterpolationMasaru KAMADA and Mitsuhiro MATSUO, A digital/analog hybrid system is presented which implements the cardinal polynomial spline interpolation of arbitrary degree. Based on the fact that the (m - 1)st derivative of a spline of degree m - 1 is a staircase function, this system generates a cardinal spline of degree m - 1 by m - 1 cascaded integrators with a staircase function input. A given sequence of sampled values are transformed by a digital filter into coefficients for the B-spline representation of the spline interpolating the sampled values. The values of its (m - 1)st derivative with respect to time are computed by the recurrence formula interpreting differentiation of the spline as difference of the coefficients. Then a digital-to-analog converter generates a staircase function representing the (m - 1)st derivative, which is integrated by a cascade of m - 1 analog integrators to make the expected spline. In order to cope with the offset errors involved in the integrators, a dynamical sampled-data control is attached. An analog-to-digital converter is employed to sample the output of the cascaded integrators. Target state of the cascaded integrators at each sampling instance is computed from the coefficients for the B-spline representation. The state error between the target and the estimated is compensated by feeding back a weighted sum of the state error to the staircase input., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 01 Sep. 2004
Periodic spline orthonormal bases closest to periodic B-spline basis
Masaru Kamada and Rentsen Enkhbat
International Journal of Pure and Applied Mathematics, Jul. 2004
Synthesis of letter strings in script style based on minimum principle
Masaru Kamada; Rentsen Enkhbat and Takayuki Kawahito
Advanced Modeling and Optimization, Mar. 2004
Optimal synthesis of handwritten letters from their characteristic points
Masaru Kamada; Takayuki Kawahito and Rentsen Enkhbat
Optimization and Optimal Control, P.M.Pardalos, I.Tseveendorj and R.Enkhbat, eds., World Scientific, Singapore, Oct. 2003
Sampling and modified optimization for reproduction of handwritten letters
Masaru Kamada
Sampling Theory in Signal and Image Processing, May 2003
Hardware implementation of cardinal spline interpolation
Masaru Kamada and Mitsuhiro Matsuo
International Workshop on Sampling Theory and Applications 2003, May 2003
Throughput analysis of nonorthogonal multilevel spread ALOHA systemsNobuyoshi Komuro; Hiromasa Habuchi and Masaru Kamada, In this paper, the nonorthogonal multilevel spread ALOHA system,, which combines the spread ALOHA system with the nonorthogonal multilevel system is investigated. In particular, the throughput performance of the nonorthogonal multilevel spread ALOHA system is evaluated by theoretical analysis. It is found that the throughput performance of the nonorthogonal multilevel spread ALOHA system is greater than that of the conventional spread ALOHA systems when the network traffic is not busy. It is found that application of the traffic control to the nonorthogonal multilevel spread ALOHA system is effective in improvement of the performance., IEEE
IEEE Global Telecommunications Conference, Nov. 2002
Jerk minimum interpolation of spatial points with application to generation of cursive letters
Takayuki Kawahito and Masaru Kamada
Proceedings of the 2001 International Conference on Sampling Theory and Applications, Orlando(Florida), May 2001
Sampling and reconstruction of audio signals with finite time delay
Masaru Kamada and Naoto Tayama
Proceedings of the 2001 International Conference on Sampling Theory and Applications, May 2001
A sampling theory for hand-drawn letters
Masaru Kamada
Proceedings of the 1999 International workshop on sampling theory and applications, Aug. 1999
A note on designing a digital simulator of continuous-time systems
Koichi Ichige; Masaru Kamada; Naohisa Otsuka and Rokuya Ishii
Proceedings of the 1999 International Technical Conference on Circuits/Systems, Computers and Communications, Jul. 1999
Finite algorithm for maximizing convex quadratic functions over compact set
Rentsen Enkhbat; Masaru Kamada and Ya Bazarsad
Journal of the Mongolian Mathematical Society, 1999
A simple scheme of decomposing and reconstructing continuous-time signal by B-splnes
Koichi Ichige; Masaru Kamada and Rokuya Ishii
IEICE Transactions on Fundamentals, Nov. 1998
A method of obtaining a digital simulator of continuous-time systems for computer simulation
Koichi Ichige; Masaru Kamada; Naohisa Otsuka and Rokuya Ishii
1998 IFAC Workshop on Control in Disasters, Sep. 1998
A simple discrete version of B-splinesKoichi Ichige and Masaru Kamada, A simple discrete version of B-splines defined as a manifold discrete convolution of sampled rectangular functions is proposed in the analogy of B-splines being multifold convolution integrals of rectangular functions. It is then proven that its staircase interpolation tends to the B-spline when the sampling interval goes to zero. Differences between those functions at various sampling intervals are numerically compared., TAYLOR & FRANCIS LTD
International Journal of Systems Science, Mar. 1998
A finite method for quadratic programming
Rentsen Enkhbat; Masaru Kamada and Ya Bazarsad
Journal of the Mongolian Mathematical Society, 1998
A simple scheme of decomposition and reconstruction of continuous-time signals by B-splinesKoichi Ichige; Masaru Kamada and Rokuya Ishii, An approximate scheme is proposed for decomposing and reconstructing a continuous-time signal as a linear combination of the B-splines. It is an oversampling discrete-time implementation derived by substituting the multifold RRS functions for the B-splines. Its analysis yields conditions for the circuit parameters to avoid instability and overflow, and to meet required precision. A design example and its numerical simulation are also presented., IEEE
CD-ROM Proceedings of the IEEE 1998 International Symposium on Circuits and Systems, Monterey(California), Jun. 1997
An Implementation-Oriented Scheme of Sampling and Reconstructing Continuous-Time Signals
Masaru Kamada and Osamu Sasaki
Proceedings of the 1997 International Workshop on Sampling Theory and Applications, Aveiro(Portugal, Jun. 1997
An approximation for discrete B-splines in time domainKoichi Ichige and Masaru Kamada, A simple discrete version of B-splines defined as a multifold discrete convolution of sampled rectangles Is proposed in the analogy of B-splines being multifold convolution integrals of rectangular functions. Then it is proven that its staircase interpolation tends to the B-spline when the sampling interval goes to zero, This version can be regarded as an approximation for the discrete B-splines established in the literature, and it is faster in numerical evaluation., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE signal Processing Letters, Mar. 1997
Quadratic spline interpolatorMasaru Kamada; Takafumi Endoh; Koichi Ichige and Kazuo Toraichi, A simple system is proposed which generates a quadratic spline function interpolating a given discrete-time signal. It works as a D-A converter which is free from phase distortions and whose output is smooth. The output is constructed as two-fold integration of a staircase signal. A kind of sampled data feedback is employed to stabilize the system. Its circuit is mainly composed of a pair of D-A and A-D converter chips and two analogue integrators. This hardware complexity is about a quarter of current systems., TAYLOR & FRANCIS LTD
International Journal of Systems Science, Oct. 1996
Discrete B-spline functions
Koichi Ichige and Masaru Kamada
Proceedings of the 1996 European Signal Processing Conference, Trieste, Sep. 1996
A mathematical model for coding hand-drawn letters
Masaru Kamada; KenYa Yozezawa and Yuji Abe
Proceedings of the 1996 European Signal Processing Conference, Trieste, Sep. 1996
A time function to express hand-drawn lettersMasaru Kamada; Akira kawakami and Kaz Ishikawa, An efficient function to express curves of hand-drawn letters is derived from a simple model of hand-drawing. The pen-tip is modeled as a point mass which is moved by force as constant as possible on a plane and is navigated to go through some characteristic points to form the curve's peculiar shape. The characteristic points are assumed to be where the pen-tip has locally minimal velocity and where it touches the baseline. Among those points, a steeple like the left bottom of 'h' is prominent, which is modeled as a pausing point where the tip should pause at a moment to alter its moving direction. The derived solution is a mixture of a fifth order spline with its knots placed at the characteristic points and a fourth order spline with those at the pausing ones. This mixed function is proven by computer experiments employing real hand-drawn data to be efficient in expressing hand-drawn letters. This means that the proposed model well imitates hand-drawing., IEEE
Proceedings of the 22nd Annual International Conference of the IEEE Industrial Electronics Society, Taipei, Aug. 1996
A scheme of discretization and reconstruction of signalsMasaru Kamada; Takahiro Yamada and Ken-Ichi Takahashi, A scheme of discretizing and reconstructing continuous-time signals is proposed which is based on a system-theoretic model of continuous-time signals, and directly implementable by real circuitry in continuous-time, A continuous-time signal is modeled as the output of a fixed continuous-time dynamical system Sigma excited by a staircase function with a fixed width of stairs. The discretization system estimates the stair heights from a given signal so that it will be reproduced well by the reconstruction system comprising the zero-order hold and the model system Sigma., IEEE
Proceedings of the 22nd Annual International Conference of the IEEE Industrial Electronics Society, Taipei, Aug. 1996
A smooth signal generator based on quadratic B-spline functionsMasaru Kamada; Kazuo Toraichi and Rudolf E. Kalman, A hardware system of quadratic spline interpolation is proposed, Its properties are that switching noise with digital-to-analog (D-A) converter chips does not appear and that the output is smooth without any analog low pass filters that disorganize the phase characteristics., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Signal Processing, May 1995
Knots position for the smoothest periodic quadratic spline interpolation of equispaced dataKazuo Toraichi and Masaru Kamada, The knot positions of a periodic quadratic spline function which furnishes the smoothest interpolation of equispaced data are clarified. It is proved that the knots are to be at the midpoints of every two adjacent data points for the smoothest interpolation. This gives a partial answer to the problem where to locate the knots to obtain the smoothest spline interpolation of even degree., ELSEVIER SCIENCE PUBL CO INC
Linear Algebra and Its Applications, 1995
A function to express hand-drawn lettersMasaru Kamada; Kazuo Toraichi; C. Y. Huang and W. E. Pan, An efficient function to express curves of hand-drawn letters is derived from a simple model of hand-drawing. The pen-tip is modeled as a point mass which is moved by force as constant as possible on a plane and is navigated to go through some characteristic points to form the curve's peculiar shape. The characteristic points are assumed to be where the pen-tip has locally minimal velocity and where it touches the baseline. Among those points, a steeple like the left bottom of 'h' is prominent, which is modeled as a pausing point where the tip should pause at a moment to alter its moving direction. The derived solution is a mixture of a fifth order spline with its knots placed at the characteristic points and a fourth order spline with those at the pausing ones. This mixed function is proven by computer experiments employing real hand-drawn data to be efficient in expressing hand-drawn letters. This means that the proposed model well imitates hand-drawing., IEEE
Proceedings of the 1994 European Signal Processing Conference, Edinburgh, Sep. 1994
A general formula for the wavelets in fluency approachKazuo Toraichi and Masaru Kamada, Fluency approach is to deal with staircase, polygonal and band-limited signals as those in a unified series of signal spaces of which characteristics vary with the parameter of degree. Scaling functions and their duals have been obtained which fulfill a part of the requirements to constitute a multiresolutional analysis in this approach. The purpose of the present paper is to derive general formulae to express wavelets and their duals which fulfill the rest of the requirements. It is the first step to have a general expression of every possible wavelet in selecting a wavelet. The degree is limited to be arbitrary positive odd integers so far in this paper. The general formulae derived in this paper are in the form of linear combinations of the sampling functions, which are scaling functions, and their duals. These formulae can be also regarded as a reduced version of the conditions for multiresolutional analysis in terms of sampling functions and their duals. The general formulae provide a start point for selecting a wavelet which decides characteristics of a multiresolutional analysis in the fluency approach. Some criteria for the concrete selection for each purpose of multiresolutional analysis and a formula for the even-degree cases are yet to be aquired in the future., IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, May 1994
A method of designing windows based on spline approximationKazuo Toraichi; Ryuichi Kawamoto; Masaru Kamada; Mamoru Iwaki and Rokuya Ishii, A practical method of designing windows by using C-spline functions is proposed. Given sidelobe fall-off controls the frequency characteristics at higher frequencies, while desired characteristics and specified error tolerance control those at lower frequencies. The optimal dimension is determined as the minimum to satisfy the tolerance of error in approximating the desired characteristics in the logarithmic scale. The effectiveness of this method is demonstrated by several design examples superior to Kaiser-Bessel, gaussian, Hanning, Blackman, Parzen or cos(alpha) x windows. respectively., TAYLOR & FRANCIS LTD
International Journal of Systems Science, Aug. 1993
A Design Method of Window Functions by Spline Functions Based on Weighted Equiripple Approximation
Kazuo Toraichi; Mamoru Iwaki; Masaru Kamada; Rokuya Ishii and Ryuichi Kawamoto
Transactions of Institute of Electrical Engineers of Japan, Apr. 1993
A Function Generator Based on Quadratic B-spline Functions
Masaru Kamada; Kazuo Toraichi and Norio Nakamura
Trans. IEICE Japan, May 1992
A method of automatically compressing fonts with high resolution
Yasuhiro Ohtaki; Kazuo Toraichi; Takahiko Horiuchi and Masaru Kamada
Proceedings of ICPR International Conference on Document Analysis and Recognition, Sep. 1991
A D/A convertor based on B-spline functions
Norio Nakamura; Masaru Kamada and Kazuo Toraichi
Proceedings of IASTED International Conference on Circuits and Systems, Jul. 1991
A series of signal spaces covering the staircase and bandlimited ones
Masaru Kamada and Kazuo Toraichi
Proceedings of IASTED International Conference on Circuits and Systems, Jul. 1991
A Design Method of Window Functions by Spline Approximation
Kazuo Toraichi; Ryuichi Kawamoto; Masaru Kamada and Rokuya Ishii
Trans. IEICE Japan, Nov. 1990
On the improvement on accuracy of handwritten Japanese character recognition system based on fluency function approximation
Takahiko Horiuchi; Kazuo Toraichi; Masaru Kamada; Kazuhiko Yamamoto and Hiromitsu Yamada
Proceedings of IASTED International Symposium on Machine Learning and Neural Networks, Oct. 1990
An optional processor unit specific to relaxation operations
Masaru Kamada; Kazuo Toraichi; Kazuhiko Yamamoto and Hiromitsu Yamada
Proceedings of IASTED International Symposium on Machine Learning and Neural Networks, Oct. 1990
A Note on Connection between Spline Signal Spases and Bond-Limited Signal Spaces
Kazuo Toraichi and Masaru Kamada
Trans. IEICE Japan, Sep. 1990
Design of window function based on spline approximation
Kazuo Toraichi; Ryuichi Kawamoto; Masaru Kamada and Rokuya Ishii
Proceedings of IASTED International Conference on Signal Processing and Digital Filtering, Jun. 1990
A Note on Error Estimation for Spline Interpolation with Sampling Bases
Masaru Kamada; Kazuo Toraichi and Yasuhiko Ikebe
Trans. IEICE Japan, 1990
Characterizotion of periodic spline functions in comparison with Fourier series
Kazuo Toraichi and Masaru Kamada
Transactions of Institute of Electronics, Information and Communication Engineers of Japan, Jun. 1989
Biorthonormal expansion in signal spaces composed of spline functions
Kazuo Toraichi; Mamoru Iwakiand Masaru Kamada
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, May 1989
A quadratic spline function generator based on B-spline functionsMasaru Kamada; Hitoshi Sakai and Kazuo Toraichi, Pi. function generator is developed which purges D-A conversion of phase distortions by replacing both the hold circuit and the analog lowpass filter. This generator implements interpolation of a discrete-time signal by a quadratic spline function which is a smooth piecewise polynomial. Fidelity in the amplitude characteristic of the generator is estimated referring to the one of the ideal lowpass filter. It is also proved that the generator is of linear phase. The generator is constructed in the form of an FIR digital filter with a time-varying impulse response. Based on the linear phase characteristic, the generator is useful in D-A conversion, especially in audio signal processing applications. © 1989 IEEE
roceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, May 1989
Effects of ultrasonic components on perceived tone quality
Masaru Kamada and Kazuo Toraichi
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, May 1989
A quadratic spline function generatorKazuo Toraichi; Masaru Kamada and Ryoichi Mori, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Trans. on Acoustics, Speech, and Signal Processing, Apr. 1989
Design of Window Functions Using Spline Functions
Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Transactions of Institute of Electronics, Information and Communications Engineers, Jul. 1988
Improvement of Video Hardcopy Image Quality by Using Spline InterpolationKazuo Toraichi; Masaru Kamada; Satomi Ishiuchi and Ryoichi Mori, This paper aims at realizing a video hardcopy of a quality required for photographs in an album. A method is proposed for digital image interpolation by which the subjective quality of the static image is improved to the same level as that of the original dynamic image. The goal of the improvement of the subjective quality was set as 1.5 times in terms of the improvement in the resolution in vertical and horizontal directions. The method is based on the bivariate quadratic spline interpolation. By calculating the corresponding impulse response, a digital filter with a high‐speed operation was designed. By simulation and psychovisual experiment, it was verified that the goal of the improvement was achieved. Copyright © 1989 Wiley Periodicals, Inc., A Wiley Company
Transactions of Institute of Electronics, Information and Communications Engineers, Jul. 1988
Sampling Bases for the Signal Spaces Composed of Spline Functions
Masaru Kamada; Kazuo Toraichi and Ryoichi Mori
Trans. IEICE Japan, Mar. 1988
Formulation of digital signal processing in spline signal spaces
Masaru Kamada; Kazuo Toraichi and Ryoichi Mori
Proceedings of International Symposium on Signal Processing and Its Applications, Aug. 1987
A D-A Converter which generates smooth signals
Kazuo Toraichi; Masaru Kamada; Qi Wang and Ryoichi Mori
Proceedings of International Symposium on Signal Processing and Its Applications, Aug. 1987
Feature extraction by spline function for relaxation matching
Iwao Sekita; Kazuo Toraichi; Masaru Kamada; Ryoichi Mori; Kazuhiko Yamamoto and Hiromitsu Yamada
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, Apr. 1987
A Spline Function Generator
Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Transactions of Institute of Electrical Engineers of Japan, Apr. 1987
A microprocessor-based left ventricular cineangiogram analyser
Kazuo Toraichi; Sai Yang; Masaru Kamada; Ryoichi Mori and Nobuyuki Otsu
Journal of Medical and Biological Engineering and Computing, Mar. 1987
A Series of Window Functions Obtained by Convolution Integrals of Rectangle Window with Itself
Transaction of Institute of Electonics, Information and Communications Engineers, 1987
An orthonormal basis in the space of periodic spline functions
Masaru Kamada; Kazuo Toraichi and Ryoichi Mori
Tensor (Nwe Series), 1987
Properties of interpolation by periodic spline functions of degree 2
Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Transactions of Institute of Electrical Engineers of Japan, Dec. 1986
A round-robin architecture for relaxation operation
Masaru Kamada; Kazuo Toraichi; Kazuhiko Yamamot; Hiromitsu Yamada and Ryoichi Mori
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, Apr. 1986
Spline filter- A time-varying digital filter and its application
Haruhiko Takeuchi; Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, Apr. 1986
Sampling theorem in the signal space spanned by spline functions of degree 2
Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Transactions of Institute of Electronics and Communication Engineers of Japan, Oct. 1985
A note on periodic spline sampling basis
Kazuo Toraichi; Masaru Kamada and Ryoichi Mori
Transactions of Institute of Electronics and Communication Engineers of Japan, Sep. 1984
