Presentations -

Applications of Algebra to Information Security

Akihiro Yamamura  [Invited]

Lecture at Rajamangala University of Technology Rattanakosin  (Rajamangala University of Technology Rattanakosin, Thailand)  2024.04  -  2024.04  Rajamangala University of Technology Rattanakosin

On Permutation Statistics of Parikh Matrices

Akihiro Yamamura  [Invited]

International Conference of Young Algebraists in Thailand  (Rajamangala University of Technology Isan, Khon Kaen, Thailand)  2024.03  -  2024.03  Rajamangala University of Technology Isan, Khon Kaen

Entringer family of permutations determined by Parikh matrices

Akihiro Yamamura

Groups, Algebra and Related Areas in Computer Science  (京都大学数理解析研究所)  2024.02  -  2024.02  京都大学数理解析研究所

Permutation Statistics by Parikh Matrix

Akihiro Yamamura

104th WORKSHOP ON GENERAL ALGEBRA  (Blagoevgrad, Bulgaria)  2024.02  -  2024.02  South-West University "Neofit Rilski" Department of Mathematics

Blind Decryption and Private Information Delivery

Akihiro Yamamura

暗号と情報セキュリティシンポジウム（SCIS2024)  (出島メッセ長崎)  2024.01  -  2024.01  暗号と情報セキュリティシンポジウム（SCIS2024)

Inverse Semigroups, Cryptography and Language Theory

Akihiro Yamamura  [Invited]

The 16th International Conference of YOUNG ALGEBRAISTS IN THAILAND  (Maejo University, Thailand)  2023.03  -  2023.03 

Latin Hexahedra and Related Combinatorial Structures

Akihiro Yamamura

群・環・言語と計算機科学の周辺領域  (京都大学数理解析研究所)  2023.02  -  2023.02  京都大学数理解析研究所

Latin Hexahedra and Related Combinatorial Structures

Akihiro Yamamura

Annual International Conference on Algorithms and Discrete Applied Mathematics  (Gandhinagar, India)  2023.02  -  2023.02  Association for Computer Science and Discrete Mathematics

Privacy Protection Data Delivery Scheme

Akihiro Yamamura

The 6th International Symposium on Mobile Internet Security  2022.12  -  2022.12 

Euler numbers appearing in tree of Parikh matrices of permutations

山村明弘

Logic, Algebraic system, Language and Related Areas in Computer Science  (京都大学数理解析研究所)  2022.02  -  2022.02  京都大学数理解析研究所

Left simple and left cancellative semigroups without idempotents

Akihiro Yamamura

Logic, Language, Algebraic system and Related Areas in Computer Science  (京都大学数理解析研究所)  2021.02  -  2021.02 

Two-Way Jumping Automata

Szilard Zsolt Fazekas, Kaito Hoshi, Akihiro Yamamura

The Fourteenth International Frontiers of Algorithmics Workshop  (Haikou Hainan)  2020.10  -  2020.10  Hainan University

Groupoid Action and Rearrangement Problem of Bicolor Arrays by Prefix Reversals

Akihiro Yamamura, Riki Kase and Tatiana Jajcayova

Computer Sicence in Russia 2020 (Ekaterinburg, Russia)  2020.06  -  2020.07 

OBG v BAG = CBG?

Akihiro Yamamura

Algebraic system, Logic, Language and Related Areas in Computer Science II  (京都大学)  2020.02  -  2020.02  数理解析研究所

Enhancement of Automata with Jumping Modes

Szilard Zsolt Fazekas, Kaito Hoshi, Akihiro Yamamura

International Workshop on Cellular Automata and Discrete Complex Systems   (University of Guadalajara, Mexico)  2019.06  -  2019.06 

Combinatorial Designs and One Factorizations of Tripartite Graphs

Akihiro Yamamura

International Workshop on Graphs, Semigroups, and Semigroup Acts  (Technical University Berlin, Germany)  2017.10  -  2017.10 

Rearrangement Problem of Multidimensional Arrays by Prefix Reversals

Akihiro Yamamura

International Conference on Automata and Formal Languages  2017.09  -  2017.09 

Rearrangement Problem of Multidimensional Arrays by Prefix Reversals

Akihiro Yamamura

International Conference on Automata and Formal Languages  (Debrecen, Hungary)  2017.09  -  2017.09  University of Debrecen

Rearrangement problem of two-dimensional arrays by prefix reversals

Akihiro Yamamura

AAA94 + NSAC 2017  (Novi Sad, Serbia)  2017.06  -  2017.06 

The difference of class makes carelessness

Saaya Konno, Szilárd Zolt Fazekas, Akihiro Yamamura

Integrative Methods of Inquiry in Education: SYMMETRY  (国際教養大学)  2017.03  -  2017.03 

Reforming Calculus Textbook of High Schools and Colleges in Japan

Akihiro Yamamura, Mahito Kobayasahi

Integrative Methods of Inquiry in Education: SYMMETRY  (国際教養大学)  2017.03  -  2017.03 

Rearrangement problem

Akihiro Yamamura

Mini Workshop 2017 on Algebraic Systems and Theoretical Computer Science  (京都産業大学)  2017.02  -  2017.02  京都産業大学

Application of Firefly Algorithm to Uncapacitated Facility Location Problem

Kohei Tsuya, Akihiro Yamamura

Mini Workshop on Algebraic Systems and Theoretical Computer Science  (京都産業大学)  2017.02  -  2017.02  京都産業大学

Proposal of anonymous single sign-on using attribute-based signatures

Koyo Horikawa, Akihiro Yamamura

Mini Workshop on Algebraic Systems and Theoretical Computer Science  (京都産業大学)  2017.02  -  2017.02  京都産業大学

Application of Firefly Algorithm to Uncapacitated Facility Location Problem

Kohei Tsuya, Mayumi Takaya, Akihiro Yamamura

International Symposium on Intelligent Systems Technologies and Applications  (Jaipur, India.)  2016.09  -  2016.09  LNM Institute of Information Technology

Facility Location Problem Using Firefly Algorithm

Kohei Tsuya, Akihiro Yamamura

International Workshop on Natural Computing  (国際教養大学)  2016.05  -  2016.05 

Analysis of a Monte Carlo Tree Search in Knight-Amazons

Akihiro Yamamura

International Workshop on Natural Computing  (国際教養大学)  2016.05  -  2016.05 

Anonymous Single Sign-on Using Attribute-based Signatures

Koyo Horikawa, Akihiro Yamamura

International Workshop on Natural Computing  (国際教養大学)  2016.05  -  2016.05 

Fitness Function in ABC Algorithm for Uncapacitated Facility Location Problem

Yusuke Watanabe, Mayumi Takaya, Akihiro Yamamura

ICT-Eurasia 2014  (Daejeon, South Korea)  2015.10  -  2015.10 

Invitation to Yamamura Laboratory

Akihiro Yamamura

Security Symposium  (Asan, South Korea)  2015.10  -  2015.10  Soon Chun Hyang University

Comparative Study of Monte-Carlo Tree Search and Alpha-Beta Pruning in Amazons

Hikari Kato, Szilard Zsolt Fazekas, Mayumi Takaya, Akihiro Yamamura

ICT-Eurasia 2014  (Daejeon, South Korea)  2015.10  -  2015.10 

Rearranging Two Dimensional Arrays by Prefix Reversals

Akihiro Yamamura

Reachability Problem  (Warsaw, Poland)  2015.09  -  2015.09 

Rearranging Two Dimensional Arrays by Prefix Reversals

Akihiro Yamamura

University Seminar  (Bratislava, Slovakia)  2015.09  -  2015.09  Comenius University

Rearranging Two Dimensional Arrays by Prefix Reversals

Akihiro Yamamura

Semigroups Algebras and Applications  (Cochin, India)  2015.09  -  2015.09  Cochin University of Science and Technology

Analysis of a Monte Carlo Tree Search in Knight-Amazons

Hikari Kato, Mayumi Takaya, Akihiro Yamamura

International Conference on Soft Computing and Software Engineering  (University of California-Berkeley, U.S.A.)  2015.03  -  2015.03 

Study of 3D L-systems

Ryo Takahashi, Szilard Zolt Fazekas, Akihiro Yamamura

Mini Workshop in KSU 2015   (京都産業大学)  2015.02  -  2015.02  京都産業大学

One-way Jumping Finite Automata

Hiroyuki Chigahara, Szilrd Zolt Fazekas, Akihiro Yamamura

Mini Workshop in KSU 2015  (京都産業大学)  2015.02  -  2015.02  京都産業大学

One-way Jumping Automata

Hiroyuki Chigahara, Szilard Zolt Fazekas, Akihiro Yamamura

Semigroups, Languages and Algebras  (秋田大学)  2014.08  -  2014.08  秋田大学

2-Dimensional Pancake Sorting

Kohei Tsuya, Akihiro Yamamura

Semigroups, Languages and Algebras  (秋田大学)  2014.08  -  2014.08  秋田大学

Public Key Encryptions Based on Conjugacy Search Problem

Ryo Takahashi, Akihiro Yamamura

Semigroups, Languages and Algebras  (秋田大学)  2014.08  -  2014.08  秋田大学

Security Analysis of Public Key Encryptions Based on Conjugacy Search Problem

Akihiro Yamamura

ICT-EurAsia 2014  (Bali, Indonesia)  2014.04  -  2014.04 

Security Analysis of Public Key Encryption Based on Conjugacy Search Problem

Akihiro Yamamura

International Conference on Recent Trends in Algebra and Analysis with its Application  (Aligarh Muslim University, India)  2014.02  -  2014.02  Aligarh Muslim University

Basic Study on Pancake Sorting

Kohei Tsuya, Akihiro Yamamura

The Seventh International Conference on Materials Engineering for Resources  2013.11  -  2013.11  ICMR

Recognition of One-Stroke Symbols by Humans and Computers

Mayumi Takaya, Hikari Kato, Takeshi Komatsubara, Yusuke Watanabe, Akihiro Yamamura

International Cocference on Cognitive Science  (Kuching, Sarawak, Malaysia)  2013.08  -  2013.08 

CAPTCHA Suitable for Smartphones

Yusuke Tsuruta, Mayumi Takaya, Akihiro Yamamura

ICT-Eurasia  (Yogyakarta, Indonesia)  2013.03  -  2013.03 

CAPTCHA suitable for smartphones

Akihiro Yamamura

Mini Workshop in KSU 2013  (京都産業大学)  2013.02  -  2013.02  京都産業大学

Quasicrystals and Tiling Semigroups

Akihiro Yamamura

International Conference on Materials Engineering for Re- sources  (秋田大学)  2009.09  -  2009.09  ICMR

Word problem of amalgamated free products of commutative inverse semigroups

Akihiro Yamamura

Novi Sad Algebraic Conference  (Novi Sad, Serbia)  2009.08  -  2009.08 

Automata theoretic methods in inverse semigroups

Akihiro Yamamura

Seminar  (Milano, Italy)  2008.11  -  2008.11  Politechnico di Milano

Automata theoretic methods in inverse semigroups

2008.11  -  2008.11 

Homomorphic encryptions of sums of groups

Akihiro Yamamura

Applied Algebra, Algebraic Algorithms, and Error Correcting Codes  (Bangalore, India)  2007.12  -  2007.12 

Threshold anpnymous group identification and zero-knowledge proof

Akihiro Yamamura, Takashi Kurokawa, Junji Nakazato

Information Security and Privacy  (Townsville, Australia)  2007.07  -  2007.07 

Introduction on research in NICT

Akihiro Yamamura

Seminar  (Shanghai, China)  2007.07  -  2007.07  上海交通大学

Threshold Zero-Knowledge Proof and Anonymous Group Identification

Akihiro Yamamura

Seminar  (Shanghai, China)  2007.07  -  2007.07  上海交通大学

Krull-Remak-Schmidt decompositions of orthocryptogroups

Akihiro Yamamura

Conference on Semigroups, Acts, and Categories with Applications to Graphs  (Tarutu, Estonia)  2007.06  -  2007.06 

Krull-Remak-Schmidt theorem for orthocryptogroups

Akihiro Yamamura

Algebras, Languages and Computation  (東邦大学)  2006.09  -  2006.09  東邦大学

Research activities on cryptography

Akihiro Yamamura

INDIA-JAPAN ICT FORUM  (Chennai, India)  2006.09  -  2006.09 

t-out-of-m anonymous group identification schemes

Akihiro Yamamura

Workshop on Fomal Languages and Automata  (京都産業大学)  2006.09  -  2006.09 

Research activities on cryptography

Akihiro Yamamura

INDIA-JAPAN ICT FORUM  (東京)  2006.04  -  2006.04  総務省

Embedding theorems for HNN extensions of inverse semigroups

Akihiro Yamamura

Intenational Algebraic Conference  (Ekaterinburg, Russia)  2005.08  -  2005.08 

Homomorphic encryptions and cryptographic protocols

Akihiro Yamamura

Equations in Groups and Applications of Algebraic Methods in Computer Science and Cryptology  (Piestany, Slovak Republic)  2005.07  -  2005.07 

Geometrical methods of Schutzenberger automata for embedding theorems of inverse semigroups

Akihiro Yamamura

Workshop on Fomal Languages and Automata  (京都)  2005.07  -  2005.07  京都産業大学

Embedding theorems for HNN extensions of inverse semigroups

Akihiro Yamamura

International Conference on Semigroups and Language  (Lisbon, Portugal)  2005.07  -  2005.07 

Oblivious transfer and private information retrieval based on the p-subgroup assumption

A.Yamamura, T,Jajcayova, T.Kurokawa

SOFSEM 2005  (Liptovsky Jan, Slovak Republic)  2005.01  -  2005.01  Slovak Society for Computer Science

A class of inverse monoids acting on ordered forests

Akihiro Yamamura

68th Workshop on General Algebra  (Dresden, Germany)  2004.06  -  2004.06 

Groups presented via partial automorphisms

Akihiro Yamamura

AMS International meeting  (Pisa, Italy)  2002.06  -  2002.06  American Mathematical Society

Groups presented via partial automorphisms

Akihiro Yamamura

Crema meeting  (Crema, Italy)  2002.06  -  2002.06 

Generic algorithms and key agreement protocols based on group actions

Akihiro Yamamura

The twelfth international conference on algorithms and computations  (Christ Church, New Zealand)  2001.12  -  2001.12 

Embedding problems for groups presented via partial automorphisms

Akihiro Yamamura

Algebra Conference  (Sumy, Ukraine)  2001.07  -  2001.07 

Embedding problems for groups presented via partial automorphisms

Akihiro Yamamura

Finitely presented groups: algorithms and open problems  (Trento, Italy)  2001.07  -  2001.07 

Private information retrieval based on the subgroup membership problem

A. Yamamura and T. Saito

Information Security and Privacy  (Sydney, Australia)  2001.07  -  2001.07 

Error detection and authentication in quantum key distribution

A. Yamamura and H. Ishizuka

Information Security and Privacy  (Sydney, Australia)  2001.07  -  2001.07 

Embedding problems for groups presented via partial automorphisms

Akihiro Yamamura

Semigroups, algorithms, automata and languages  (Coimbra, Portugal)  2001.07  -  2001.07 

Van Kampen diagram and E-unitary coextensions

Akihiro Yamamura

61st Workshop on General Algebra  (Darmstadt, Germany)  2001.02  -  2001.02 

A class of inverse monoids acting on ordered forests

Akihiro Yamamura

International Colloquium on Semigroup Theory  (Szeged, Hungary)  2000.07  -  2000.07 

Semigrooup actions and Cryptography

Akihiro Yamamura

Seminar  (Brno, Czec Republic)  2000.07  -  2000.07  Brno University

Semigrooup actions and Cryptography

Akihiro Yamamura

Seminar  (Bratislava, Slovakia)  2000.07  -  2000.07  Comenius University

Embedding theorems for groups

Akihiro Yamamura

International Conference on Geometric Methods in Group Theory and Semigroup Theory  (Lincoln, U.S.A.)  2000.05  -  2000.05 

Key agreement protocol over a commutative group

Akihiro Yamamura

ICWAC 2000  (京都)  2000.03  -  2000.03  京都産業大学

A functional cryptosystem using a group action

Akihiro Yamamura

Information Security and Privacy  (Wollongong, Australia)  1999.04  -  1999.04 

Amalgams, SL(2, Z) and Cryptography

Akihiro Yamamura

International Conference on Algorithmic Problems in Groups and Semigroups,  (Lincoln, U.S.A.)  1998.05  -  1998.05 

Public-key cryptosystems using the modular group

Akihiro Yamamura

International Workshop on Practice and Theory in Public Key Cryptography  (横浜)  1998.02  -  1998.02 

HNN extensions of semilattices

Akihiro Yamamura

AMS section meeting  (Milwaukee, U.S.A.)  1997.10  -  1997.10  American Mathematical Society

HNN extensions of semilattices and the Nielsen-Schreier theorem

Akihiro Yamamura

International Congress in Algebras and Combinatorics  (Hong Kong)  1997.08  -  1997.08 

Universal unitary covers of inverse semigroups

Akihiro Yamamura

Semigroups and Applications  (St.Andrews, U.K.)  1997.07  -  1997.07 

Graphs of inverse monoids

Akihiro Yamamura

International Conference on Algebraic Engineering and Semigroups  (会津)  1997.03  -  1997.03 

HNN extensions of inverse semigroups and applications

Akihiro Yamamura

International Conference on Modern Algebra and its Applications  (Nashville, U.S.A.)  1996.05  -  1996.05 

HNN extensions of inverse semigroups

Akihiro Yamamura

AMS national meeting  (Orlando, U.S.A.)  1996.01  -  1996.01  American Mathematical Society