最佳自正交不等保护能力码的组合构造

本文给出了基于区组设计的最佳自正交不等保护能力(UEP)码的两种新的构造方法,并且,获 得了具有丰富保护层次的最佳自正交UEP码。      

带有能力约束的VRP的一种遗传算法

就商品配送中,带有能力约束的车辆路径问题(VRP),设计了一种新的遗传算法.该算法的核心在于构建一种新的染色体编码,将VRP问题转化为m个TSP问题,并设计出新的杂交算子.算法中染色体表示、评价函数的构造、杂交变异算子的设计经过实例计算的检验被证明较为可靠,算法运算速度快,容易获得有效解.     

全电子移频电码化驱动模块分析与应用

介绍了移频电码化信号驱动模块的组成、功能及工作原理;结合站场图,分析四显示自动闭塞区段移频电码化驱动模块的2种可用编码模式;以赛音温都日站为例,说明移频电码化驱动模块的具体应用.     

ALC中RS码应用于FLPIM的差错性能分析

针对DPIM调制与RS码结合中的矛盾,分析了一种DPIM的改进形式—FLPIM与RS码结合的差错性能。结果表明,FLPIM峰值光功率相等时,在高斯信道中可获得约2-4dB的编码增益,在弱湍流信道中可获得约2-4dB的编码增益。     

霍夫曼编码和游程编码在图像编码中的应用

传真图像的信息量非常大,对其进行数据压缩,不仅可以节省存储空间,而且可以有效地降低传输时间。针对传真图像压缩这一实际问题提出了一种实用编码,实用编码将霍夫曼编码与自适应游程编码有机结合,对于出现频率较大的游程长度,采用霍夫曼编码,出现频率较小且长度较长的游程,采用自适应游程编码,从而有效地缩短了码字,提高了编码效率。     

关于前缀码的一点注记

主要目的是研究前缀码,得到了前缀码与极大前缀码的若干特征.从而推广了Shyr的关于前缀码的结果     

EXPERIMENTAL INVESTIGATION ON TWO-DIMENSIONAL UNSTEADY COLD FLOW IN MPC EXHAUST MANIFOLD

IntroductionIt is obvious that the gas flow in the exhaustmanifolds,especially at the conjunctions has amulti- dimensional characteristic[1] .The study onthis characteristic is very important for the uti-lization of exhaustenergy and the decrease of ex-haust pumping loss.In this paper,the measure-ment of cold flow has been carried out to studythe multi- dimensional phenomena of unsteadyflow in the exhaust manifolds.In order to em-phasis the important characteristics of the flowand reduce the a…     

RESEARCH ON THE DOF DISPOSITION AND MECHANISMS DESIGN OF HUMANOID ROBOT

IntroductionSome researchers[1～ 3] in Yugoslavia,Japan andAmerica have got many achievements in bipedrobot since the beginning of1 970 s.The bipedrobot can walk in static and dynamic gait and al-so can turn around and go up stairs.Recentlyhumanoid robot has become a hot researchingpoint[4,5 ] .Humanoid robot has body includinghead,neck,waist and hands.Biped robot is abasis of humanoid robot.Usually a humanoidrobot should have more than 2 0 DOF.All thetechnology problems in DOF planning,m…     

AN EFFICIENT BTC IMAGE COMPRESSION ALGORITHM

IntroductionBlock truncation coding( BTC) [1] is a simple andfast lossy image coding technique,which has theadvantage of being easy to implement comparedto transform coding and vector quantization[2 ] .Its simplicity,performance and channel error re-sisting capability make it attractive in the real-time image transmission.BTC is a one- bit adap-tive moment- preserving quantizer that preservescertain statistical moments of small blocks of theinput image in the quantized output.The origi-nal …     

UNCERTAIN KNOWLEDGE MANAGEMENT IN EXPERT SYSTEMS USING FUZZY METAGRAPHS

IntroductionThe fuzzy graph- theoretic constructs are widelyapplied in modeling and analyzing fuzzy sys-tems[1] .Whereas,existing fuzzy constructs arenot suitable for the analysis of the directed rela-tionships between sets of elements.In addition,such relationships widely exist in fuzzy systems,for example,knowledge base in fuzzy expertsystem. So,based on the metagraph proposedby A.Basu and R.W.Blanning[2 ,3] ,this paperpresents a new graph- theoretic construct,afuzzy metagraph and applies …