无损压缩技术在GIS文档管理中的应用

利用LZ77算法对GIS文档库中相关文档进行了压缩处理,并在基于B/S架构的电子政务系统中进行了应用,其测试结果满足了浏览器端客户对文档库进行访问操作的需求。     

基于W77E58的跑步机联网系统的开发

对于传统的跑步机无法联机组网,保存历史数据,实时调试等问题,介绍了一个由多台跑步机通过RS-232串行总线与上位机相连组成的跑步机联网系统。系统采用W77E58作为下位机核心控制器件,它具有双串行通讯端口,其中一个串口用于与变频器通讯,另一个串口则与上位机相连．构成跑步机网络。     

HLZ:一种采用混合字典的自适应无损编码算法

研究了在数据无损压缩领域影响常规的两种压缩算法：LZ78及LZ77， 一种改进的混合字典压缩算法HLZ（Hybrid LZ）。HLZ是基于LZ78和LZ77的一种混合算法，利用了LZ78和LZ77的互补特性，在用HLZ算法进行地，当发现已经到达字典中提供的词汇终点时，并不立刻进行编码，而是与滑动窗口相比较，若当前 字符串在滑动窗口中的匹配长度尚不及它在字典中的匹配串的长度，则采用LZ78输出，否则用LZ77编码输出，在还原输出编码时，HLZ算法建立了一个链结构，将字典中具有相同首字母的词链接起来，大大养活了搜索字典中对应最长匹配串的时间，实验结果表明，HLZ算法具有与LZ78和LZ77町似的计算复杂度和存储复杂度，但具有更好的全局与局部自适应性，更高的压缩效率。     

The Efficiency of Critical Slicing in Fault Localization

In software testing, developing effective debugging strategies is important to guarantee the reliability of software under testing. A heuristic technique is to cause failure and therefore expose faults. Based on this approach mutation testing has been found very useful technique in detecting faults. However, it suffers from two problems with successfully testing programs: (1) requires extensive computing resources and (2) puts heavy demand on human resources. Later, empirical observations suggest that critical slicing based on Statement Deletion (Sdl) mutation operator has been found the most effective technique in reducing effort and the required computing resources in locating the program faults. The second problem of mutation testing may be solved by automating the program testing with the help of software tools. Our study focuses on determining the effectiveness of the critical slicing technique with the help of the Mothra Mutation Testing System in detecting program faults. This paper presents the results showing the performance of Mothra Mutation Testing System through conducting critical slicing testing on a selected suite of programs. Zuhoor Abdullah Al-Khanjari is an assistant professor in the Computer Science Department at Sultan Qaboos University, Sultanate of Oman. She received her BSc in mathematics and computing from Sultan Qaboos University, MSc and PhD in Computer Science (Software Engineering) from the University of Liverpool, UK. Her research interests include software testing, database management, e-learning, human-computer interaction, programming languages, intelligent search engines, and web data mining and development. ~Currently, she is the coordinator of the software engineering research group in the Department of Computer Science, College of Science, Sultan Qaboos University. She is also coordinating a program to develop e-learning based undergraduate teaching in the Department of Computer Science. Currently she is holding the position of assistant dean for postgraduate studies and research in the College of Science, Sultan Qaboos University, Sultanate of Oman. Martin Woodward is a Senior Fellow in the Computer Science Department at the University of Liverpool in the UK. After obtaining BSc and Ph.D. degrees in mathematics from the University of Nottingham, he was employed by the University of Oxford as a Research Assistant on secondment to the UK Atomic Energy Authority at the Culham Laboratory. He has been at the University of Liverpool for many years and initially worked on the so-called ‘Testbed’ project, helping to develop automated tools for software testing which are now marketed successfully by a commercial organisation. His research interests include software testing techniques, the relationship between formal methods and testing, and software visualisation. He has served as Editor of the journal ‘Software Testing, Verification and Reliability’ for the past thirteen years. Haider Ramadhan is an associate professor in the Computer Science Department at Sultan Qaboos University. He received his BS and MS in Computer Science from University of North Carolina, and the PhD in Computer Science and AI from Sussex University. His research interests include visualization of software, systems, and process, system engineering, human-computer interaction, intelligent search engines, and Web data mining and development. Currently, he is the chairman of the Computer Science Department, College of Science, Sultan Qaboos University, Sultanate of Oman. Swamy Kutti (N. S. Kutti) is an associate professor in the Computer Science Department at Sultan Qaboos University. He received his B.E. in Electronics Engineering from the University of Madras, M.E. in Communication Engineering from Indian Institute of Science (Bangalore), and the MSc in Computer Science from Monash University (Australia) and PhD in Computer Science from Deakin University (Australia). His research interests include Real-Time Programming, Programming Languages, Program Testing and Verification, eLearning, and Distributed Operating Systems.     

Synthesis, X-ray structure and Hg, Se CP MAS NMR studies on the first tris(imidazolidine-2-selone) mercury complex: {Chloro-tris[N-methyl-2(3H)-imidazolidine-2- selone]mercury(II)}chloride

A novel cationic Hg(II) complex has been synthesized with N-methyl-imidazolidine-2-selone ligand. The tris(N-Methyl-imidazolidine-2-selone) mercury(II) complex, [(MeImSe)₃HgCl]⁺Cl⁻ (1), has been characterized by single crystal X-ray analysis and CP MAS ¹⁹⁹Hg and ⁷⁷Se NMR.     

嵌入式警用枪支指纹识别系统

介绍了嵌入式指纹识别系统在警用枪支上的应用,围绕小体积,高性能,低功耗,实时性等要求在软硬件上给出了可行的设计方案.该系统采用新型传感器,高性能ARM处理器和实时操作系统Vxworks使得整个识别模块达到手枪上的应用要求,大大提高提供了警用手枪使用的安全性.     

基于形状文法的鄱阳漆器纹样特征与创新设计方法研究

目的 为进一步保护和传承鄱阳漆器,提高非遗的文化和经济价值,在传统鄱阳漆器纹样的基础上进行创新推演设计,以便保留传统纹样特征的同时满足现代审美需求。方法 通过实地调研、专家访谈等方法构建鄱阳漆器纹样样本图谱;运用眼动实验法,将被试者对鄱阳漆器纹样的感性认知量化分析,识别出认可度较高的纹样;运用形状文法理论,对传统纹样进行解读和创新推演。结果 最终获取样本纹样进行提取和创新推演设计,并结合产品设计实践,验证该创新设计方案的有效性和可行性。结论 鄱阳漆器蕴含着丰富的传统文化内涵,其纹样作为传统漆器纹饰中的重要组成部分,具备很高的艺术和研究价值。以创新纹样为主要元素的衍生品能在满足当代消费需求的同时增加产品的文化内涵,体现鄱阳漆器特色,为非遗创新提供参考。     

基于数据分析的DEFLATE算法特征研究

DEFLATE压缩算法作为计算机领域中使用最广泛的开源压缩算法,大量网络协议和应用程序使用该算法对数据进行压缩处理.在当前大数据时代,无论对数据压缩算法进行适应性改进,还是为网络流量识别中的压缩流量识别提供依据,都需要对数据压缩算法特征进行分析研究.采用数据分析方法,根据DEFLATE算法流程特点,对算法进行模块分割,...     

HAl77-2铝黄铜耐脱锌腐蚀性能的研究

利用正交试验的设计方法,采用静态腐蚀试验、电化学和扫描电镜的试验和检测方法对添加了不同含量B、Sn、Ce元素的HAl77-2铝黄铜的耐脱锌腐蚀性能进行了研究。结果表明:B、Sn和Ce对提高HAl77-2铝黄铜的耐脱锌腐蚀性能都有一定的影响,影响程度顺序:BSnCe。其中,当添加量为0.05%B、0.5%Sn和0.15%Ce时,其耐脱锌腐蚀性能最佳。     

6×K36WS+IWRC—30干熄焦用压实股钢丝绳生产

干熄焦用钢丝绳由于受气体侵蚀、粉尘黏附、红焦烘烤等原因,恶劣的工作环境对钢丝绳的综合性能要求很高。介绍6×K36WS+IWRC—30干熄焦用压实股钢丝绳试制过程,给出干熄焦提升用钢丝绳生产技术要求。选用直径8.0 mm SWRH77A盘条作为制绳钢丝原料,针对不同层成品钢丝直径选择的半成品钢丝直径分别为3.40,4.30,5.30,6.50 mm。拉丝采用多道次、小压缩率方法,股绳生产中采用股淋油,钢丝绳表面涂进口油脂,股绳捻距79.2～83.3 mm,左交互捻钢丝绳整绳破断拉力达784 kN,右交互捻钢丝绳整绳破断拉力达831 kN。使用表明该钢丝绳满足用户要求,可替代进口钢丝绳。