Hajime MATSUMURAAssociate Professor
■Researcher basic information
Organization
- College of Education Training Course for School Teachers Program for Subject Education / Major in Mathematics Education
- Graduate School of Education(Course for Professional degree ) Division of Professional Teacher Education Professional Course in School Subjects
- Faculty of Education Domain of Language, Social,& Natural Sciences
Research Areas
Educational Background
Member History
- Oct. 2024 - Oct. 2024, 全国選抜小学校プログラミング大会, 茨城県大会審査委員
- Oct. 2023 - Oct. 2023, 全国選抜小学校プログラミング大会, 茨城県大会審査委員
- Oct. 2022 - Oct. 2022, 茨城県大会審査委員, 全国選抜小学校プログラミング大会
- Oct. 2021 - Oct. 2021, 茨城県大会審査委員, 全国選抜小学校プログラミング大会
- Jun. 2021 - Jun. 2021, 科学の甲子園ジュニア茨城県大会実行委員, 茨城県教育委員会
- Oct. 2020 - Oct. 2020, 茨城県大会審査委員, 全国選抜小学校プログラミング大会
- Apr. 2016 - Jul. 2016, Program Committee, DSIR 2016
- Apr. 2015 - Jul. 2015, Program Committee, DSIR 2015
- Apr. 2014 - Sep. 2014, Program Committee, IRIM2014
■Research activity information
Paper
- Path-systems in regular graphs and bipartite graphs
Mikio Kano; Haruhide Matsuda; Hajime Matsumura, <p>We say that a graph <span class="math inline">\(G\)</span> has a <span><em>path-system</em></span> with respect to a set <span class="math inline">\(W\)</span> of even number of vertices in <span class="math inline">\(G\)</span> if <span class="math inline">\(G\)</span> has vertex-disjoint paths <span class="math inline">\(P_1,P_2, \ldots, P_m\)</span> such that (i) each path <span class="math inline">\(P_i\)</span> connects two vertices of <span class="math inline">\(W\)</span> and (ii) the set of end-vertices of the paths <span class="math inline">\(P_i\)</span> is exactly <span class="math inline">\(W\)</span>. In particular, <span class="math inline">\(m=|W|/2\)</span>. Moreover, if <span class="math inline">\(G\)</span> has a path-system with respect to every set <span class="math inline">\(W\)</span> of even number of vertices in <span class="math inline">\(G\)</span>, we say that <span class="math inline">\(G\)</span> has a <span><em>path system</em></span>. We prove the following theorems: (i) if <span class="math inline">\(G\)</span> is an <span class="math inline">\(r\)</span>-edge-connected <span class="math inline">\(r\)</span>-regular graph, then for any <span class="math inline">\(r-1\)</span> edges <span class="math inline">\(e_1,\ldots, e_{r-1}\)</span>, <span class="math inline">\(G-\{e_1,\ldots, e_{r-1}\}\)</span> has a path-system, (ii) every <span class="math inline">\(k\)</span>-connected <span class="math inline">\(K_{1,k+1}\)</span>-free graph has a path-system, and (iii) if a connected bipartite graph <span class="math inline">\(G\)</span> with bipartition <span class="math inline">\((A,B)\)</span> satisfies <span class="math inline">\(|A| \le 2|B|\)</span>, <span class="math inline">\(|N_G(X)| \ge 2|X|\)</span> or <span class="math inline">\(N_G(X)=B\)</span> for all <span class="math inline">\(X\subseteq A\)</span>, and <span class="math inline">\(|N_G(Y)| \ge |Y|\)</span> or <span class="math inline">\(N_G(Y)=A\)</span> for all <span class="math inline">\(Y\subseteq B\)</span>, then <span class="math inline">\(G\)</span> has a path-system with respect to every set <span class="math inline">\(W\)</span> of even number of vertices of <span class="math inline">\(A\)</span>.</p>, Combinatorial Press
Utilitas Mathematica, 26 Jun. 2025, [Reviewed] - Odd-Even Factors of Graphs
Mikio Kano; Hajime Matsumura, Springer Science and Business Media LLC
Graphs and Combinatorics, 10 Apr. 2025, [Reviewed] - 授業で集めたデータを元にした推定,検定に関する授業の実践事例
松村初, Lead
茨城大学教育学部紀要(教育科学), 31 Jan. 2024 - Existence of a spanning tree having small diameter
Yoshimi Egawa; Michitaka Furuya and Hajime Matsumura, Elsevier
Discrete Mathematics, 01 Nov. 2021, [Reviewed] - Spanning trees with small diameters
Mikio Kano; Hajime Matsumura
AKCE International Journal of Graphs and Combinatorics, 04 Jun. 2020, [Reviewed] - エビデンスに基づく校内研修
大西有; 松村初
茨城大学全学教職センター研究報告(2019), 26 Feb. 2020 - 面積1の正方形を用いた条件付き確率の解法
松村初
茨城大学教育学部紀要(教育科学), Jan. 2020 - 5枚のカードを用いたコピープロトコルの改良
中川祐弥; 松村初
茨城大学教育学部紀要(自然科学), Jan. 2020 - 教員養成課程における算数に対する大学生の信念
野村幸代; 松村初; 小口祐一
高知大学学校教育研究, Mar. 2019 - エクセルを用いたプログラミングの授業
松村初
茨城大学教育学部紀要(教育科学), 31 Jan. 2019 - 小学校算数科における学習内容の統合的・発展的な扱い
小口祐一; 梅津健一郎; 栗原博之; 松村初; 吉井豊
茨城大学教育学部紀要(教育科学), 30 Jan. 2018 - A spanning k-spider in a graph
Ryota Matsubara; Haruhide Matsuda and Hajime Matsumura
Ars Combinatoria, Jan. 2018, [Reviewed] - Degree sum conditions for path-factors with specified end vertices in bipartite graphs
Ryota Matsubara; Hajime Matsumura; Masao Tsugaki; Tomoki Yamashita
DISCRETE MATHEMATICS, Feb. 2017, [Reviewed] - On a spanning k-tree in which specified vertices have degree less than k
Hajime Matsumura
Discussiones Mathematicae Graph Theory, Jan. 2015, [Reviewed] - Degree bounded spanning trees
Jun Fujisawa; Hajime Matsumura; Tomoki Yamashita
Graphs and Combinatorics, Sep. 2010, [Reviewed] - Degree conditions and degree bounded trees
Haruhide Matsuda; Hajime Matsumura
Discrete Mathematics, Jun. 2009, [Reviewed] - Cycle-partitions with specified vertices and edges
Hikoe Enomoto; Hajime Matsumura
Ars Combinatoria, Apr. 2009, [Reviewed] - Partitions of a graph into cycles containing a specified linear forest
Ryota Matsubara; Hajime Matsumura
Discussiones Mathematicae. Graph Theory, Jan. 2008, [Reviewed] - A note on a longest cycle which is vertex dominating
Hajime Matsumura; Kenta Ozeki; Takeshi Sugiyama
AKCE International Journal of Graphs and Combinatorics, Dec. 2007 - Vertex-disjoint short cycles containing specified edges in a graph
Hajime Matsumura
Ars Combinatoria, Jul. 2006, [Reviewed] - On a k-tree containing specified leaves in a graph
Haruhide Matsuda; Hajime Matsumura
Graphs and Combinatorics, Jun. 2006, [Reviewed] - Degree sum conditions and vertex-disjoint cycles in a graph
Shinya Fujita; Hajime Matsumura; Masao Tsugaki; Tomoki Yamashita
The Australasian Journal of Combinatorics, Jun. 2006, [Reviewed] - Vertex disjoint cycles containing specified paths of order 3 in a bipartite graph
Ryota Matsubara; Hajime Matsumura
SUT Journal of Mathematics, Dec. 2005, [Reviewed] - Vertex-disjoint 4-cycles containing specified edges in a bipartite graph
Hajime Matsumura
Discrete Mathematics, Jul. 2005, [Reviewed]
Books and other publications
Lectures, oral presentations, etc.
- 特定の stem を持つ全域木が存在するための十分条件について
第19回組合せ論若手研究集会, 18 Feb. 2023 - 教員養成における算数に対する学習者の意識の変化
日本教授学習心理学会第 14 回年会プログラム, 08 Jul. 2018 - グラフの最小次数と全域木の直径について
第13回組合せ論若手研究集会, 02 Mar. 2017 - On a diameter of a spanning tree
YCU GRAPH THEORY WORKSHOP, 01 Aug. 2016 - 2 部グラフにおける指定した頂点を結ぶパスによる分割に ついて
2014年度応用数学合同研究集会, 20 Dec. 2014 - Degree conditions for vertex-disjoint paths joining speci ed vertices in bipartite graphs
離散数学とその応用研究集会2014, 21 Aug. 2014 - Degree conditions for spanning k-spiders
Japan Conference on Graph Theory and Combinatorics, 18 May 2014 - グラフのspiderについて
離散数学1日セミナー, 08 Mar. 2014 - leafの個数を制限したグラフのspiderについて
2013年度応用数学合同研究集会, 20 Dec. 2013 - 次数を制限した全域木について
日本応用数理学会2013年度年会, 09 Sep. 2013
Affiliated academic society
Research Themes
Social Contribution Activities
- さんすうバスケイベント開催
presenter
22 Jul. 2021 - 24 Jul. 2021 - さんすうバスケイベント開催
planner
28 Nov. 2020 - 28 Nov. 2020 - 令和元年度第2回清真学園公開授業
advisor
清真学園, 30 Oct. 2019 - 30 Oct. 2019 - 教員免許状更新講習
lecturer
21 Aug. 2019 - 21 Aug. 2019 - 教員免許状更新講習
lecturer
30 Jul. 2018 - 30 Jul. 2018 - 教員免許状更新講習
lecturer
22 Aug. 2017 - 22 Aug. 2017 - 茨城県教育研究連盟研究会
advisor
08 Oct. 2016 - 08 Oct. 2016 - 茨城県教育研究連盟研究集会
advisor
08 Oct. 2016 - 08 Oct. 2016 - 第69回関東都県数学教育研究(茨城)大会
advisor
14 Nov. 2014 - 14 Nov. 2014