学术报告信息(一)
报告名称:A Generic Construction of Non-Generalized Reed-Solomon MDS Codes
报告时间:2026年4月15日(星期三)9:00-10:30
报告地点:翡翠湖校区科教楼B座1710室
报 告 人:刘宏伟 教授
工作单位:华中师范大学
举办单位:数学学院
报告简介:
GRS codes form the most prominent class of MDS codes, codes that are optimal in the sense that their minimum distance cannot be improved for a given length and code size. The study of codes that are MDS yet not GRS codes, called non-GRS MDS codes, started with the work by Roth and Lemple (1989), where the first examples were exhibited. It then gained traction thanks to the work by Beelen et al. (2017), who introduced twisted Reed-Solomon codes, and showed that families of such codes are non-GRS MDS codes. Finding non-GRS MDS codes is naturally motivated by the classification of MDS codes. In this talk, we provide a generic construction of MDS codes, yielding infinitely many examples. We then explicit families of non-GRS MDS codes. Finally, we position some of the proposed codes with respect to generalized twisted Reed-Solomon codes, and provide new view points on this family of codes.
报告人简介:
刘宏伟,华中师范大学数学与统计学学院教授,博士生导师,兼任非线性分析及其应用教育部重点实验室(华中师范大学)副主任。主要从事代数编码与密码的研究和教学工作。曾兼任中国工业与应用数学学会第八届理事会理事,现任中国工业与应用数学学会编码密码及相关组合理论专业委员会委员。2003年研究生毕业于武汉大学基础数学专业,获理学博士学位。曾先后就职于武汉重型机床厂职工大学,湖北经济学院从事教学科研工作,2001年5月至今在华中师范大学工作。先后访问美国斯克兰顿大学、肯特州立大学、新加坡南洋理工大学、香港科技大学、韩国KIAS和西江大学等海外高校和研究所进行学术交流。主持国家自然科学基金专项项目、国际合作与交流项目和面上项目等。在包括IEEE Trans. Inf. Theory, Des. Codes Cryptogr., Finite Fields Appl., Discrete Math., Sci. China Math.等国内外知名期刊发表相关研究论文80余篇。合作编写编著教材、著作5部。
学术报告信息(二)
报告名称:Expansion and Embedding of Linear Codes with Prescribed Hull Dimensions
报告时间:2026年4月15日(星期三)10:30-12:00
报告地点:翡翠湖校区科教楼B座1710室
报 告 人:罗金权 教授
工作单位:华中师范大学
举办单位:数学学院
报告简介:
In this talk, we study both expansion and embedding of linear codes in both Euclidean and Hermitian cases. Firstly we show how to expand Euclidean/Hermitian self orthogonal code preserving their orthogonal property. Our results show that every k-dimension Hermitian self-orthogonal code is contained in a (k + 1)- dimensional Hermitian self-orthogonal code. Also, for k less than half of n, every [n, k] Euclidean self-orthogonal code is contained in an [n, k + 1] Euclidean self-orthogonal code.Secondly we study the shortest t-dimensional hull embeddings of linear codes in both Euclidean and Hermitian cases. We obtain the exact length of such embeddings by adopting tools from quadratic form theory over finite fields and classical group theory. Finally, applying these algorithms, we provide examples for various settings and obtain several optimal codes inequivalent to those in the BKLC database.
报告人简介:
罗金权,2007年博士毕业于清华大学, 2007-2014年在扬州大学工作, 2014年至今在华中师范大学工作, 教授, 博导. 研究方向为代数编码、序列密码。曾在新加坡南洋理工大学和挪威卑尔根大学Selmer研究中心从事博士后研究。在包括IEEE TIT, DCC, FFA, DM, Sci. China Math等国内外知名期刊合作发表相关研究论文70余篇。