检索结果-南通市图书馆

Construction of nonbinary quantum cyclic codes by using graph method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in china(Series F) 2005年第6期48卷 693-702页

作者： LIU Tailin1,2.3, WEN Qiaoyan1 & LIU Zihui4 1. School of Science, Beijing university of Posts and Telecommunications, Beijing 100876, china 2. State Key Laboratory of Integrated Services {2., Xidian university, Xi’an 710071,china 3. Shandong Finance institute, Jinan 2.0014, china 4. School of Mathematical Sciences, Peking university, Beijing 100871, china 1. School of Science Beijing University of Posts and Telecommunications 100876 Beijing China 2. State Key Laboratory of Integrated Services network Xidian University 710071 Xi’an China 3. Shandong Finance institute 250014 Jinan China 4. School of Mathematical Sciences Peking University 100871 Beijing China

Using the graph method proposed by Schlingemann and Werner, this paper introduces a technique to construct nonbinary quantum cyclic codes and provides a specific example. We also construct the quantum codes [[8, 2. 4]... 详细信息

关键词： nonbinary quantum stabilizer codes quantum cyclic codes

A network-Based VPN Architecture Using Virtual Routing

在线全文

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural Sciences 2005年第1期10卷 161-164页

作者： ZHANG Bao-liang 1,2.HU Han-ping 1,2.,WU Xiao-gang 1,2. KONG Tao 31.State Education Ministry Key Laboratory of Image Information and Intelligent Control, Wuhan 430074, Hubei, china 2.institute of Pattem Recognition and Artificial Intelligonce, Huazhong {2. of Science and technology, Wuhan 430074, Hubei, china 3.709th Research institute of china Shipbuilding Engineering Society, Wuhan 430074, Hubei, china State Education Ministry Key Laboratory of Image Information and Intelligent Control Wuhan China Huazhong university of Science and technology Institute of Pattern Recognition and Artificial Intelligonce Wuhan China (GRID:grid.33199.31) (ISNI:***) State Education Ministry Key Laboratory of Image Information and Intelligent Control Wuhan China (GRID:grid.33199.31) Huazhong university of Science and technology Institute of Pattern Recognition and Artificial Intelligonce Wuhan China (GRID:grid.33199.31) (ISNI:***) 709th Research institute of china Shipbuilding Engineering Society Wuhan China (GRID:grid.33199.31)

A network-based Virtual Private network (VPN) architecture by using fundamental routing mechanism is proposed. This network is a virtual overlay network based on the relay of IP-in-IP tunneling of virtual routing modules. The packet format employs the encapsulation of IPSec ESP(Encapsulating Security Payload), an impact path code and an extended DS(Differentiated Services) code to support multi-path routing and QoS. Comparing with other models of VPN, this network system can be deployed in the current network with little investment, and it is easy to implement. The simulation result shows its performance is better than the traditional VPN system of black box mode.

关键词： virtual routing network-based VPN proactive defense

An implementation and optimization for scalable DHT crawler

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第4期53卷 769-779页

作者： ZHOU Mo1*, ZHANG JianYu2.& DAI YaFei1 1The National Laboratory on Local Fiber-Optic Communication networks and Advanced Optical Communication Systems of Peking university, Beijing 100871,{2. 2.3} of Computer Science and technology of Peking university, Beijing 100871,{2. 1. The National Laboratory on Local Fiber-Optic Communication networks and Advanced Optical Communication Systems of Peking university Beijing 100871 China2. Institute of Computer Science and Technology of Peking University Beijing 100871 China

KAD is one of the largest scale DHT based on real applications. Measurements on KAD is a good approach for researching DHT. Many different active and passive measurements have been made on those systems, and crawlers are novel approach in active measurement. A crawler begins crawling into the DHT with a basic set of given nodes, sending node searching requests to the nodes in the given set for contact information from more unknown nodes. There are three goals in mind while we design the crawler: finishing crawling the given nodes set as soon as possible; retrieving more nodes information after the crawling; getting result while sending as few network packets as possible. The above goals are correlated with each other. Optimizing one may impact others. This paper proposes a basic DHT crawler framework and discusses possible extension to the framework. After that we exploit the fact that the connectivity in the overlay network is universality, thus we do not need to crawl the whole overlay network space while maintaining the crawling affect.

关键词： DHT crawler network measurements

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

贵黄高速公路边坡防护效果调查与分析

上海交通大学学报 2011年第S1期45卷 120-123页

作者：陈开圣殷源吴江贵州大学土木建筑工程学院贵州贵阳550003 贵州省招标有限公司贵州贵阳550004

公路边坡的稳定性是目前研究热点之一.采用现场调查、观测与统计的方法,对贵黄公路边坡的防护形式、坡型、坡高、坡度、地质结构、稳定性以及植被的情况进行了分析.总结了不同防护形式边坡的稳定性与破坏规律,并进行了原因分析.在此基础... 详细信息

公路边坡的稳定性是目前研究热点之一.采用现场调查、观测与统计的方法,对贵黄公路边坡的防护形式、坡型、坡高、坡度、地质结构、稳定性以及植被的情况进行了分析.总结了不同防护形式边坡的稳定性与破坏规律,并进行了原因分析.在此基础上,提出了一些有意义的建议,为今后的公路边坡设计、施工和养护提供科学依据.

关键词：贵黄公路边坡防护植被调查分析

Bioinformatics analyses for signal transduction networks

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2008年第11期51卷 994-1002页

作者： LIU Wei1,2. LI Dong2. ZHU YunPing2.& HE FuChu1,2.1 College of Mechanical & Electronic Engineering and Automatization, National university of Defense technology, Changsha 410073,{2. 2.State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing institute of Radiation Medicine, Beijing 102.06,{2. 1. College of Mechanical & Electronic Engineering and Automatization National University of Defense Technology Changsha 410073 China 2. State Key Laboratory of Proteomics Beijing Proteome Research Center Beijing Institute of Radiation Medicine Beijing 102206 China

Research in signaling networks contributes to a deeper understanding of organism living activities. With the development of experimental methods in the signal transduction field, more and more mechanisms of signaling pathways have been discovered. This paper introduces such popular bioin-formatics analysis methods for signaling networks as the common mechanism of signaling pathways and database resource on the Internet, summerizes the methods of analyzing the structural properties of networks, including structural Motif finding and automated pathways generation, and discusses the modeling and simulation of signaling networks in detail, as well as the research situation and tendency in this area. Now the investigation of signal transduction is developing from small-scale experiments to large-scale network analysis, and dynamic simulation of networks is closer to the real system. With the investigation going deeper than ever, the bioinformatics analysis of signal transduction would have immense space for development and application.

关键词： signal transduction structural motif automated pathways regeneration dynamics simulation

Information content security on the Internet:the control model and its evaluation

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第1期53卷 30-49页

作者： FANG BinXing1, GUO YunChuan2.3 & ZHOU Yuan4 1School of Computer, Beijing university of Posts and Telecommunications, Beijing 10002., china 2.2. of Computing technology, Chinese Academy of Sciences, Beijing 100190, china 3Graduate university of Chinese Academy of Sciences, Beijing 100049, china 4National Computer network Emergency Response Technical Team/Coordination Center of china, Beijing 10002., china 1. School of Computer Beijing University of Posts and Telecommunications Beijing 100029 China2. Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China3. Graduate University of Chinese Academy of Sciences Beijing 100049 China4. National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China

Flooding of harmful information on the Internet seriously endangers the physiological and mental health of teenagers. Due to the user-friendliness of the Internet as well as the difficulty in the authentication for the access of specific categories of information, curbing the transmission of harmful information, i.e., assuring the information content security (ICS), has become a reasonable yet challenging alternative. At present, there is an urgent need to develop a systematic model that can effectively carry out the curbing. In fact, curbing the transmission of harmful information by way of filtering can be modeled by access control. In the paper, based on the three core-elements of communication, namely, "Who communicates with whom", "How do they communicate" and "What is the content of communication", we propose a control model, called ICCON. Unlike the existing access control, the reference monitor (RM) of our model is placed in the transmission channel, and moreover, an evaluation frame is proposed, through which the effectiveness of the RM in controlling information transmission on the Internet can be quantitatively evaluated.

关键词： content security access control quantitative evaluation

The Design, Performance Analysis and Implementation of VCAT in Backbone networks for Software Radio System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

china Communications 2009年第1期6卷 85-91页

作者： Wang Peng1, JiaDong1, Jin Depeng2., Zeng Lieguang2.1JiangNan institute of Computer technology, Wuxi, Jiangsu, 2.4083, P. R.{2. 2.epartment of Electronic Engineering, Tsinghua university, Beijing, 100084, P.R.{2. JiangNan institute of Computer technology Wuxi Jiangsu 214083 China Department of Electronic Engineering Tsinghua University Beijing 100084 China

Software Radio is a kind of promising technology in today and future’s communication systems. To share the resources of software radio systems to a large extent, we need to connect the instruments through backbone networks, such as the Multi-Service Transport Platform (MSTP), which is a dominating network technology that adopts both telecom and datacom traffic into existing transport infrastructures — Synchronous Digital Hierarchy (SDH). Virtual concatenation (VCAT) is one of the key technologies in MSTP. Compared with traditional contiguous concatenation, VCAT reduces transmission granularities, provides more flexibility to network Management System (NMS) and as a result, improves the network efficiency greatly. In this paper, we introduce our design and implementation of VCAT module for a MSTP ASIC. The procedure of theoretical analysis to determine several important performance related parameters is also discussed in detail. The over- all design has been thoroughly simulated and verified through our self-made FPGA board, and has been successfully applied in our MSTP ASICs. We believe our work is significant for future development of software radio technology.

关键词： SRT VCAT NMS MSTP ASIC

Cell cycle-dependent gene networks relevant to cancer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第8期18卷 945-952页

作者： Yun Xiao a,1, Xia Lia,b,*,1, Yueying Yang a, Yadong Wangc, Shaoqi Rao a,b a College of Bioinformatics Science and technology, and Bio-pharmaceutical Key Laboratory of Heilongjiang Province and State, Harbin Medical university, Harbin 150086,{2. b Biomedical Engineering institute of Capital Medical university, Beijing 10004,{2. c Department of Computer Science, Harbin institute of technology, Harbin 150080,{2. College of Bioinformatics Science and technology and Bio-pharmaceutical Key Laboratory of Heilongjiang Province and State Harbin Medical University Harbin 150086 China Biomedical Engineering institute of Capital Medical university Beijing 10004 China Department of Computer Science Harbin Institute of Technology Harbin 150080 China

The analysis of sophisticated interplays between cell cycle-dependent genes in a disease condition is one of the largely unexplored areas in modern tumor biology research. Many cell cycle-dependent genes are either oncogenes or suppressor genes, or are closely associated with the transition of a cell cycle. However, it is unclear how the complicated relationships between these cell cycle-dependent genes are, especially in cancers. Here, we sought to identify significant expression relationships between cell cycle-dependent genes by analyzing a HeLa microarray dataset using a local alignment algorithm and constructed a gene transcriptional network specific to the cancer by assembling these newly identified gene-gene relationships. We further characterized this global network by partitioning the whole network into several cell cycle phase-specific sub-networks. All generated networks exhibited the power-law node-degree distribution, and the average clustering coefficients of these networks were remarkably higher than those of pure scale-free networks, indicating a property of hierarchical modularity. Based on the known protein-protein interactions and Gene Ontology annotation data, the proteins encoded by cell cycle-dependent interacting genes tended to share the same biological functions or to be involved in the same biological processes, rather than interacting by physical means. Finally, we identified the hub genes related to cancer based on the topological importance that maintain the basic structure of cell cycle-dependent gene networks.

关键词： Cell cycle Microarray HeLa cell Gene network

Nerual　network　Expert　System　and　Their　Application　to　Forecasting　Water　Invasion　of　Colliery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 1995年第2期6卷 52-57页

作者： Zhang Jing & Li Renhou (Computer & Application Group, Xi’an university of technology, Xi’an 710048,{2.)(System Engineering institute of Xi’an JiaoTong university, Xi’an 710049,{2.) Computer & Application Group Xi'an University of Technology Xi'an 710048 China System Engineering institute of Xi'an JiaoTong university Xi'an 710049 China

In this paper, we propose a formal definition, general structure and work principle of the Neural network Expert System (NNES) based on joint-type knowledge representation, and show a practical application example usi... 详细信息

关键词： Neural network Expert system Water calamity Forecasting.