数据加密新方法的研究

本文提出了利用复数旋转码进行数据加密的基本原理和方法。研究表明,这种码字可以很方便地实现由密令、密位或密标组成的多层保密系统。由于加密解密过程和纠错编码译码过程类似,复数旋转码可以同时完成数据加密和差错控制功能,从而能够构造出一种包括数据加密、纠错和调制环节的多功能组合式传输器。     

A New Algorithm for Mining Frequent Pattern

Mining frequent pattern in transaction database,time-series databases,and many other kinds of databases have been studied popularly in data mining research.Most of the previous studies adopt Apriori-like candidate set generation-and-test approach.However,candidate set generation is very costly.Han J.proposed a novel algorithm FP-growth that could generate frequent pattern without candidate set.Based on the analysis of the algorithm FP-growth,this paper proposes a concept of equivalent FP-tree and proposes an improved algorithm,denoted as FP-growth,which is much faster in speed,and easy to realize,FP-growth adopts a modifeid structure of FP-tree and header table,and only generates a header table in each recursive operation and projects the tree to the original FP-tree,The two algorithms get the same frequent pattern set in the same transaction database,but the performance study on computer shows that the speed of the improved algorithm,FP-growth,is at least two times as fast as that of FP-growth.     

高码率Turbo码中确定性交织器的设计

交织器设计在Turbo码理论中具有重要地位，高码率Turbo码对交织器具有特殊要求，通过对影响交织器设计的5个重要因素分析，研究了如何设计理想的Turbo码交织器，并讨论了3种常见确定性交织器的映射函数以及在高码率Turbo码中的奇偶性设计，计算机模拟结果显示通过映射函数得以的3种奇偶交织器实现简单且在高码率Turbo码中能够取得较好的性能。     

Identification Simulation for Dynamical System Based on Genetic Algorithm and Recurrent Multilayer Neural Network

Introduction　　Inpracticalapplication ,thereexistmoreorlessnonlinearphenomenainamajorityofphysicalsystems .Inordertostudythesekindsofphysicialsystems ,anonlinearsystemmodelmustbesetupfirstofall,andthensomeparametersidentificationofthepredefinedmodelmustb…     

Chinese Remainder Codes

Chinese Remainder Codes are constructed by applying weak block designs and Chinese Remainder Theorem of ring theory．The new type of linear codes take the congruence class in the congruence class ring R/I1∩I2∩…∩In for the information bit,embed R/Ji into R/I1∩I2∩…∩In,and asssign the cosets of R/Ji as the subring of R/I1∩I2∩…∩In and the cosets of R/Ji in R/I1∩I2∩…∩In as check lines.There exist many code classes in Chinese Remainder Codes,which have high code rates.Chinese Remainder codes are the essential generalization of sun Zi Codes.     

一类双环网络的最短路径问题

对双环网络DL（N，h）（满足gcd（N，h－1）＝h－1），进行了分析，证明了这类双环网络中任意两节点间的最短路径可用简单的数学表达式来描述，且当最短路径形式不唯一时，给出了所有形式的最短路径的公式。在此基础上给出了一个求最短路径的非常简便的算法。文中还讨论了该类网络的直径等有关问题。     

基于自适应谐振理论的Web文档聚类集成方法

提出了基于自适应谐振理论的Web文档聚类集成方法．该方法先用蚁群算法对Web文档进行聚类,再用ART神经网络对聚类结果集成．实验结果表明,集成后的聚类综合质量高于集成前的聚类综合质量．     

神经网络求解MTSP的应用研究

对多路施行商问题（ＭＴＳＰ）根据出发城市的不同和返回情况分成了四个子问题，建立了各问题的神经网络计算能量函数和迭代公式，提出了智能化的优化方法，并用中国３１个直辖市、省会和自治区首府为例对ＭＴＳＰ进行了计算机模拟，说明了神经网络用于求解组合优化问题是十分有效的。