日本語
The University of Electro-Communications 
Graduate School of Informatics and Engineering, School of Informatics and Engineering 
Division of General Education 

Associate Professor 
HARUHISA ISHIDA 

Academic degrees
Doctor of Philosophy (Science)  University of Tsukuba  1997/03 

Classes responsible within the university
2017  微分積分学第一  Spring semester  Undergraduate, daytime  Liberal arts 
2017  解析学基礎論  Spring semester  Graduate, IE  Master's program  Liberal arts 
2017  解析学基礎論(夜間修士対応用)  Spring semester  Graduate, IE  Master's program  Liberal arts 
2017  微分積分学第二  Fall semester  Undergraduate, daytime  Liberal arts 
2017  数学演習第二  Fall semester  Undergraduate, daytime  Liberal arts 
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Current research areas
Basic analysis 
Mathematical analysis 

Research keywords
hyperbolic partial differential equations, systems of linear ordinary differential equations 
Cauchy problem, boundary value problem, mixed problem 
well-posedness, global solvability 
oscillation theory 
asymptotic analysis 

Current research subjects
Global solvability for nonlinear weakly hyperbolic equations  Time global solution Hyperbolic equation Energy method  1997-Present 
Well-posedness of the Cauchy problem for weakly hyperbolic equations  Hyperbolicity Cauchy problem Well-posedness  1999-Present 
Oscillation Theory for Degenerate Hyperbolic Equations  degenerate hyperbolic equation, Cauchy problem, mixed problem, super eigenfunction, variational method, representation formula  2007-Present 
Energy estimates for solutions of hyperbolic equations via refined diagonalizations  hyperbolic equation, energy estimate, diagonalization  2011-Present 

Published books
Book  理工系 基礎数学演習  石田晴久,伊東裕也,榎本直也,大野真裕,木田雅成,久藤衡介,田吉隆夫,内藤敏機,山口耕平,山田裕一  コロナ社  2015/04/20  978-4-339-06109-3 
Book  Series and Differential Equations  Haruhisa Ishida, Jong Son Shin  Makino Shoten  2011/09/20 
Book  Basic Exercises in Mathematics in Courses of Science and Technology  石田晴久,伊東裕也,大野真裕,木田雅成,久藤衡介,田吉隆夫,内藤敏機,山口耕平,山田裕一  昭晃堂  2005/04/10 
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Published papers
Paper  Yes  On second order weakly hyperbolic equations and the ultradifferentiable classes  Fumihiko Hirosawa, Haruhisa Ishida  Journal of Differential Equations  255/ 7, 1437-1468  2013/10 
Paper  Yes  On asymptotic behavior of solutions to linear differential systems with variable coefficients via characteristic numbers  Haruhisa Ishida, Hyung-Ju Lee  Funkcialaj Ekvacioj (Serio Internacia)  53/ 3, 359-379  2010/12 
Paper  Yes  Oscillatory properties for semilinear degenerate hyperbolic equations of second order  Haruhisa Ishida, Yasuo Yuzawa  Journal of Mathematical Analysis and Applications  356/ 2, 624-632  2009/08 
Paper  Yes  Levi conditions to the Gevrey well-posedness for hyperbolic operators of higher order  Haruhisa Ishida  Journal of Mathematics of Kyoto University  49/ 1, 173-191  2009/05 
Paper  Yes  Well-posedness of the Cauchy problem in Gevrey classes for some weakly hyperbolic equations of higher order  Ferruccio Colombini, Haruhisa Ishida  Journal d'Analyse Mathematique  90, 13-25  2003/11 
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Research presentations
Oral presentation for an academic conference  On second order weakly hyperbolic equations and the ultradifferentiable classes  Division of Functional Equations, Annual Meeting of Mathematical Society of Japan in 2014  No  Haruhisa Ishida, Fumihiko Hirosawa  2014/03/15 
Oral presentation for an academic conference  Levi conditions for higher order hyperbolic equations by weight functions  函数方程式論分科会講演アブストラクト、2008年度年会、日本数学会,2008年度年会、日本数学会  No  Haruhisa Ishida  2008/03 
Oral presentation for an academic conference  Well-posedness of the Cauchy problem in Gevrey classes for some weakly hyperbolic equations of higher order  函数方程式論分科会講演アブストラクト、2002年度年会、日本数学会  No  Ferruccio Colombini, Haruhisa Ishida  2001/03 
Symposium  On linear systems of Lanchester-type differential equations  「第23回超局所解析と古典解析」研究集会  No  石田晴久  2016/12/03 
Symposium  On asymptotic equivalences of linear differential systems  「第22回超局所解析と古典解析」研究集会  No  石田晴久  2015/12/05 
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Memberships of academic societies
Mathematical Society of Japan  1995/06-Present 
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Committee activity in the University
図書館委員会  委員  2017/04-Present 
オンライン資料検討WG委員  委員  2017/04-2019/03 
学部時間割作成WG  委員  2013/04-2017/03 
学生支援センター会議  委員  2013/04-2015/03 
図書館委員会  委員  2011/04-2013/03 
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