Masaaki Harada

Stefka Bouyuklieva, Iliya Bouyukliev, Masaaki Harada: Some extremal self-dual codes and unimodular lattices in dimension 40. Finite Fields and Their Applications 21: 67-83 (2013)

Naoki Chigira, Masaaki Harada, Masaaki Kitazume: On the Classification of Extremal Doubly Even Self-Dual Codes with 2-Transitive Automorphism Group. CoRR abs/1302.1626 (2013)

Masaaki Harada: Optimal self-dual Z₄-codes and a unimodular lattice in dimension 41. Finite Fields and Their Applications 18(3): 529-536 (2012)

Hirokazu Kobayashi, Masaaki Harada, Satoshi Senga, Kazushige Yamada, Junichro Soeda, Tsutomu Sekibe: Cross-Layer adaptive power save control method for wireless local area networks. WiMob 2012: 815-822

Makoto Araya, Masaaki Harada: On some optimal linear codes over F5. CoRR abs/1205.5141 (2012)

Koichi Betsumiya, Masaaki Harada, Hiroshi Kimura: Hadamard matrices of order 32 and extremal ternary self-dual codes. Des. Codes Cryptography 58(2): 203-214 (2011)

Masaaki Harada: On the residue codes of extremal Type II Z₄-codes of lengths 32 and 40. Discrete Mathematics 311(20): 2148-2157 (2011)

Masaaki Harada, Tsuyoshi Miezaki: An upper bound on the minimum weight of Type II Z_2k-codes. J. Comb. Theory, Ser. A 118(1): 190-196 (2011)

Masaaki Harada, Akihiro Munemasa: Classification of Quaternary Hermitian Self-Dual Codes of Length 20. IEEE Transactions on Information Theory 57(6): 3758-3762 (2011)

Masaaki Harada: A Complete Classification of Doubly Even Self-Dual Codes of Length 40. CoRR abs/1104.3727 (2011)

Masaaki Harada: On the Residue Codes of Extremal Type II Z4-Codes of Lengths 32 and 40. CoRR abs/1104.3925 (2011)

Masaaki Harada: Some Extremal Self-Dual Codes and Unimodular Lattices in Dimension 40. CoRR abs/1111.2637 (2011)

Masaaki Harada: Optimal Self-Dual Z4-Codes and a Unimodular Lattice in Dimension 41. CoRR abs/1111.3420 (2011)

Makoto Araya, Masaaki Harada: Mutually Disjoint Steiner Systems S(5, 8, 24) and 5-(24,12,48) Designs. Electr. J. Comb. 17(1) (2010)

Masaaki Harada, Clement W. H. Lam, Akihiro Munemasa, Vladimir D. Tonchev: Classification of Generalized Hadamard Matrices H(6,3) and Quaternary Hermitian Self-Dual Codes of Length 18. Electr. J. Comb. 17(1) (2010)

T. Aaron Gulliver, Masaaki Harada: MDS self-dual codes of lengths 16 and 18. IJICoT 1(2): 208-213 (2010)

Masaaki Harada: Extremal Type II Z₄-codes of lengths 56 and 64. J. Comb. Theory, Ser. A 117(8): 1285-1288 (2010)

Masaaki Harada, Michael Kiermaier, Alfred Wassermann, Radinka Yorgova: New binary singly even self-dual codes. IEEE Transactions on Information Theory 56(4): 1612-1617 (2010)

Masaaki Harada, Akihiro Munemasa: Classification of quaternary Hermitian self-dual codes of length 20. CoRR abs/1012.0898 (2010)

Masaaki Harada, Akihiro Munemasa: Classification of self-dual codes of length 36. CoRR abs/1012.5464 (2010)

Masaaki Harada, Akihiro Munemasa: There exists no self-dual [24, 12, 10] code over \mathbb F₅{{\mathbb F}_5}. Des. Codes Cryptography 52(1): 125-127 (2009)

Masaaki Harada, Akihiro Munemasa: A complete classification of ternary self-dual codes of length 24. J. Comb. Theory, Ser. A 116(5): 1063-1072 (2009)

Masaaki Harada, Akihiro Munemasa, Boris Venkov: Classification of ternary extremal self-dual codes of length 28. Math. Comput. 78(267): 1787-1796 (2009)

Masaaki Harada, Akihiro Munemasa: On the Classification of Self-dual -Codes. IMA Int. Conf. 2009: 78-90

Masaaki Harada, Tsuyoshi Miezaki: An Upper Bound on the Minimum Weight of Type II ZZ_2k-Codes. CoRR abs/0906.5023 (2009)

Masaaki Harada: An Extremal Doubly Even Self-Dual Code of Length 112. Electr. J. Comb. 15(1) (2008)

Stefka Bouyuklieva, Masaaki Harada, Akihiro Munemasa: Determination of weight enumerators of binary extremal self-dual [42, 21, 8] codes. Finite Fields and Their Applications 14(1): 177-187 (2008)

Masaaki Harada, Keiji Taniguchi: Performance Analysis of M-ary Orthogonal Code Shift Keying in Fading Channels. IEICE Transactions 91-B(2): 673-676 (2008)

T. Aaron Gulliver, Masaaki Harada: New Nonbinary Self-Dual Codes. IEEE Transactions on Information Theory 54(1): 415-417 (2008)

Masaaki Harada, Akihiro Munemasa: There exists no self-dual [24,12,10] code over F5. CoRR abs/0809.0733 (2008)

Naoki Chigira, Masaaki Harada, Masaaki Kitazume: Extremal self-dual codes of length 64 through neighbors and covering radii. Des. Codes Cryptography 42(1): 93-101 (2007)

Masaaki Harada, Wolf H. Holzmann, Hadi Kharaghani, M. Khorvash: Extremal Ternary Self-Dual Codes Constructed from Negacirculant Matrices. Graphs and Combinatorics 23(4): 401-417 (2007)

Hiroaki Nakazima, Masaaki Harada: Performance Improvement of M-ary CSK by Using a Code Set Having Low Auto- and Cross-Correlation Properties in Multipath Fading Channels. IEICE Transactions 90-B(6): 1532-1534 (2007)

Masaaki Harada: Self-Orthogonal 3-(56, 12, 65) Designs and Extremal Doubly-Even Self-Dual Codes of Length 56. Des. Codes Cryptography 38(1): 5-16 (2006)

T. Aaron Gulliver, Masaaki Harada: Classification of extremal double circulant self-dual codes of lengths 74-88. Discrete Mathematics 306(17): 2064-2072 (2006)

Masaaki Harada, Akihiro Munemasa: Some restrictions on weight enumerators of singly even self-dual codes. IEEE Transactions on Information Theory 52(3): 1266-1269 (2006)

Masaaki Harada, Clement W. H. Lam, Vladimir D. Tonchev: Symmetric (4,4)-Nets and Generalized Hadamard Matrices Over Groups of Order 4. Des. Codes Cryptography 34(1): 71-87 (2005)

Masaaki Harada: Remark on a 5-Design Related to a Putative Extremal Doubly-Even Self-Dual [96, 48, 20] Code. Des. Codes Cryptography 37(2): 355-358 (2005)

T. Aaron Gulliver, Masaaki Harada, Takuji Nishimura, Patric R. J. Östergård: Near-Extremal Formally Self-Dual Even Codes of Lengths 24 and 32. Des. Codes Cryptography 37(3): 465-471 (2005)

Masaaki Harada, Masaaki Kitazume, Akihiro Munemasa, Boris Venkov: On some self-dual codes and unimodular lattices in dimension 48. Eur. J. Comb. 26(5): 543-557 (2005)

T. Aaron Gulliver, Masaaki Harada: On the Minimum Weight of Codes over F₅ Constructed from Certain Conference Matrices. Des. Codes Cryptography 31(2): 139-145 (2004)

Masaaki Harada, Michio Ozeki, Kenichiro Tanabe: On the Covering Radius of Ternary Extremal Self-Dual Codes. Des. Codes Cryptography 33(2): 149-158 (2004)

Makoto Araya, Masaaki Harada: MDS codes over F₉ related to the ternary Golay code. Discrete Mathematics 282(1-3): 233-237 (2004)

T. Aaron Gulliver, Masaaki Harada, Jon-Lark Kim: Erratum to "Construction of new extremal self-dual codes" [Discrete Mathematics 263 (2003) 81-91]. Discrete Mathematics 289(1-3): 207- (2004)

Masaaki Harada, Akihiro Munemasa, Kenichiro Tanabe: Extremal self-dual [40, 20, 8] codes with covering radius 7. Finite Fields and Their Applications 10(2): 183-197 (2004)

Masaaki Harada, Masaaki Kitazume, Akihiro Munemasa: On a 5-design related to an extremal doubly even self-dual code of length 72. J. Comb. Theory, Ser. A 107(1): 143-146 (2004)

Koichi Betsumiya, Masaaki Harada: Optimal self-dual codes over F₂*F₂ with respect to the Hamming weight. IEEE Transactions on Information Theory 50(2): 356-358 (2004)

Radinka Dontcheva, Masaaki Harada: Some Extremal Self-Dual Codes with an Automorphism of Order 7. Appl. Algebra Eng. Commun. Comput. 14(2): 75-79 (2003)

Koichi Betsumiya, Masaaki Harada: Formally Self-Dual Codes Related to Type II Codes. Appl. Algebra Eng. Commun. Comput. 14(2): 81-88 (2003)

Stefka Bouyuklieva, Masaaki Harada: Extremal Self-Dual [50, 25, 10] Codes with Automorphisms of Order 3 and Quasi-Symmetric 2-(49, 9, 6) Designs. Des. Codes Cryptography 28(2): 163-169 (2003)

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada: Extremal Self-Dual Codes over F₂ × F₂. Des. Codes Cryptography 28(2): 171-186 (2003)

Koichi Betsumiya, Stelios Georgiou, T. Aaron Gulliver, Masaaki Harada, Christos Koukouvinos: On self-dual codes over some prime fields. Discrete Mathematics 262(1-3): 37-58 (2003)

T. Aaron Gulliver, Masaaki Harada, Jon-Lark Kim: Construction of new extremal self-dual codes. Discrete Mathematics 263(1-3): 81-91 (2003)

Masaaki Harada, Vladimir D. Tonchev: Self-orthogonal Codes from Symmetric Designs with Fixed-point-free Auto-morphisms. Discrete Mathematics 264(1-3): 81-90 (2003)

Masaaki Harada, Patric R. J. Östergård: On the Classification of Self-Dual Codes over F₅. Graphs and Combinatorics 19(2): 203-214 (2003)

Stelios Georgiou, Masaaki Harada, Christos Koukouvinos: Orthogonal Designs and Type II Codes over Z2k. Des. Codes Cryptography 25(2): 163-174 (2002)

Masaaki Harada: Self-dual Z₄-codes and Hadamard matrices. Discrete Mathematics 245(1-3): 273-278 (2002)

Stefka Bouyuklieva, Masaaki Harada: On Type IV self-dual codes over Z₄. Discrete Mathematics 247(1-3): 25-50 (2002)

Masaaki Harada, Patric R. J. Östergård: Self-dual and maximal self-orthogonal codes over F₇. Discrete Mathematics 256(1-2): 471-477 (2002)

Masaaki Harada, Masaaki Kitazume: Z₆-Code Constructions of the Leech Lattice and the Niemeier Lattices. Eur. J. Comb. 23(5): 573-581 (2002)

Masaaki Harada, Patric R. J. Östergård: Classification of Extremal Formally Self-Dual Even Codes of Length 22. Graphs and Combinatorics 18(3): 507-516 (2002)

Radinka Dontcheva, Masaaki Harada: New extremal self-dual codes of length 62 and related extremal self-dual codes. IEEE Transactions on Information Theory 48(7): 2060-2064 (2002)

Steven T. Dougherty, Masaaki Harada, Manabu Oura: Note on the g-fold Joint Weight Enumerators of Self-Dual Codes over Z_k. Appl. Algebra Eng. Commun. Comput. 11(6): 437-445 (2001)

T. Aaron Gulliver, Masaaki Harada: Codes over and Improvements to the Bounds on Ternary Linear Codes. Des. Codes Cryptography 22(1): 89-96 (2001)

Koichi Betsumiya, Masaaki Harada: Binary Optimal Odd Formally Self-Dual Codes. Des. Codes Cryptography 23(1): 11-22 (2001)

Koichi Betsumiya, Masaaki Harada: Classification of Formally Self-Dual Even Codes of Lengths up to 16. Des. Codes Cryptography 23(3): 325-332 (2001)

Masaaki Harada: An extremal ternary self-dual [28, 14, 9] code with a trivial automorphism group. Discrete Mathematics 239(1-3): 121-125 (2001)

T. Aaron Gulliver, Masaaki Harada: Orthogonal Frames in the Leech Lattice and a Type II Code over _{Integer 22}. J. Comb. Theory, Ser. A 95(1): 185-188 (2001)

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada, Akihiro Munemasa: On type II codes over F₄. IEEE Transactions on Information Theory 47(6): 2242-2248 (2001)

Koichi Betsumiya, Masaaki Harada, Akihiro Munemasa: Type II Codes over F_2^r. AAECC 2001: 102-111

T. Aaron Gulliver, Masaaki Harada: Optimal Double Circulant Z₄-Codes. AAECC 2001: 122-128

Steven T. Dougherty, T. Aaron Gulliver, Masaaki Harada: Optimal Formally Self-Dual Codes over F₅ and F₇. Appl. Algebra Eng. Commun. Comput. 10(3): 227-236 (2000)

T. Aaron Gulliver, Masaaki Harada: Double Circulant Self-Dual Codes over GF(5). Ars Comb. 56 (2000)

Masaaki Harada, Michio Ozeki: Extremal self-dual codes with the smallest covering radius. Discrete Mathematics 215: 271-281 (2000)

Steven T. Dougherty, Masaaki Harada, Patrick Solé: Shadow lattices and shadow codes. Discrete Mathematics 219(1-3): 49-64 (2000)

Masaaki Harada: On the existence of extremal Type II codes over Z₆. Discrete Mathematics 223(1-3): 373-378 (2000)

Masaaki Harada, Masaaki Kitazume: Z₄-Code Constructions for the Niemeier Lattices and their Embeddings in the Leech Lattice. Eur. J. Comb. 21(4): 473-485 (2000)

Philippe Gaborit, Masaaki Harada: Construction of Extremal Type II Codes over Z. Des. Codes Cryptography 16(3): 257-269 (1999)

T. Aaron Gulliver, Masaaki Harada: Extremal double circulant Type II codes over Z₄ and construction of 5-(24, 10, 36) designs. Discrete Mathematics 194(1-3): 129-137 (1999)

Steven T. Dougherty, T. Aaron Gulliver, Masaaki Harada: Optimal ternary formally self-dual codes. Discrete Mathematics 196(1-3): 117-135 (1999)

Alexis Bonnecaze, Philippe Gaborit, Masaaki Harada, Masaaki Kitazume, Patrick Solé: Niemeier lattices and Type II codes over Z₄. Discrete Mathematics 205(1-3): 1-21 (1999)

T. Aaron Gulliver, Masaaki Harada: New Optimal Self-Dual Codes over GF(7). Graphs and Combinatorics 15(2): 175-186 (1999)

T. Aaron Gulliver, Masaaki Harada: An Optimal Unimodular Lattice in Dimension 39. J. Comb. Theory, Ser. A 88(1): 158-161 (1999)

Steven T. Dougherty, Philippe Gaborit, Masaaki Harada, Patrick Solé: Type II Codes Over F₂ + u F₂. IEEE Transactions on Information Theory 45(1): 32-45 (1999)

T. Aaron Gulliver, Masaaki Harada: Codes of Lengths 120 and 136 Meeting the Grey-Rankin Bound and Quasi-Symmetric Designs. IEEE Transactions on Information Theory 45(2): 703-706 (1999)

Eiichi Bannai, Steven T. Dougherty, Masaaki Harada, Manabu Oura: Type II Codes, Even Unimodular Lattices, and Invariant Rings. IEEE Transactions on Information Theory 45(4): 1194-1205 (1999)

Masaaki Harada: Construction of an Extremal Self-Dual Code of Length 62. IEEE Transactions on Information Theory 45(4): 1232-1233 (1999)

Steven T. Dougherty, Masaaki Harada: New extremal self-dual codes of length 68. IEEE Transactions on Information Theory 45(6): 2133-2136 (1999)

Toru Aoki, Philippe Gaborit, Masaaki Harada, Michio Ozeki, Patrick Solé: On the covering radius of Z₄-codes and their lattices. IEEE Transactions on Information Theory 45(6): 2162-2168 (1999)

Steven T. Dougherty, Philippe Gaborit, Masaaki Harada, Akihiro Munemasa, Patrick Solé: Type IV self-dual codes over rings. IEEE Transactions on Information Theory 45(7): 2345-2360 (1999)

T. Aaron Gulliver, Masaaki Harada: Construction of optimal Type IV self-dual codes over F₂+_µF₂. IEEE Transactions on Information Theory 45(7): 2520-2521 (1999)

Masaaki Harada: New extremal self-dual codes of lengths 36 and 38. IEEE Transactions on Information Theory 45(7): 2541-2543 (1999)

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada: Binary Optimal Linear Rate 1/2 Codes. AAECC 1999: 462-471

T. Aaron Gulliver, Masaaki Harada: Classification of Extremal Double Circulant Self-Dual Codes of Lengths 64 to 72. Des. Codes Cryptography 13(3): 257-269 (1998)

Masaaki Harada: New Extremal Type II Codes over Z₄. Des. Codes Cryptography 13(3): 271-284 (1998)

Masaaki Harada, T. Aaron Gulliver, Hitoshi Kaneta: Classification of extremal double-circulant self-dual codes of length up to 62. Discrete Mathematics 188(1-3): 127-136 (1998)

T. Aaron Gulliver, Masaaki Harada: Double Circulant Self-Dual Codes Over Z_2k. IEEE Transactions on Information Theory 44(7): 3105-3123 (1998)

Masaaki Harada: Weighing Matrics and Self-Dual Codes. Ars Comb. 47 (1997)

T. Aaron Gulliver, Masaaki Harada: Classification of Extremal Double Circulant Formally Self-Dual Even Codes. Des. Codes Cryptography 11(1): 23-35 (1997)

T. Aaron Gulliver, Masaaki Harada: Weight Enumerators of Double Circulant Codes and New Extremal Self-Dual Codes. Des. Codes Cryptography 11(2): 141-150 (1997)

Steven T. Dougherty, T. Aaron Gulliver, Masaaki Harada: Extremal binary self-dual codes. IEEE Transactions on Information Theory 43(6): 2036-2047 (1997)

T. Aaron Gulliver, Masaaki Harada: Certain Self-Dual Codes over Z₄ and the Odd Leech Lattice. AAECC 1997: 130-137

Masaaki Harada: Existence of New Extremal Doubly-Even Codes and Extremal Singly-Even Codes. Des. Codes Cryptography 8(3): 273-283 (1996)

T. Aaron Gulliver, Masaaki Harada: Weight enumerators of extremal singly-even [60, 30, 12] codes. IEEE Transactions on Information Theory 42(2): 658-659 (1996)

Masaaki Harada, Hiroshi Kimura: New Extremal Doubly-Even [64, 32, 12] Codes. Des. Codes Cryptography 6(2): 91-96 (1995)

Masaaki Harada, Vladimir D. Tonchev: Singly-Even Self-Dual Codes and Hadamard Matrices. AAECC 1995: 279-284