检索结果-内蒙古大学图书馆

International Conference on Communication Systems Software and Middleware (COMSWARE)

作者： Husain Husna Santi Phithakkitnukoon Srikanth Palla Ram Dantu Network Security Laboratory Department of Computer Science and Engineering University of North Texas Denton TX USA

Compromised computers, known as bots, are the major source of spamming and their detection helps greatly improve control of unwanted traffic. In this work we investigate the behavior patterns of spammers based on their underlying similarities in spamming. To our knowledge, no work has been reported on identifying spam botnets based on spammerspsila temporal characteristics. Our study shows that the relationship among spammers demonstrates highly clustering structures based on features such as content length, time of arrival, frequency of email, active time, inter-arrival time, and content type. Although the dimensions of the collected feature set is low, we perform principal component analysis (PCA) on feature set to identify the features which account for the maximum variance in the spamming patterns. Further, we calculate the proximity between different spammers and classify them into various groups. Each group represents similar proximity. Spammers in the same group inherit similar patterns of spamming a domain. For classification into Botnet groups, we use clustering algorithms such as Hierarchical and *** identify Botnet spammers into a particular group with a precision of 90%.

关键词： Principal component analysis Unsolicited electronic mail Filtering Pattern analysis computer security Laboratories computer science computer networks Communication system traffic control Frequency

来源：评论

学校读者我要写书评

暂无评论

Research on the Solving Scheme of E-Commerce System Based on Web Services

Research on the Solving Scheme of E-Commerce System Based on...

引用

International Conference on Management of e-Commerce and e-Government, ICMECG

作者： Ying Hao Cheng Lv Department of Computer Instruction&Network Information Beijing University of Civil Engineering and Architecture Beijing China

ISBN: (纸本)9781479965441

The problems and drawbacks of existing e-commerce systems are discussed in this paper. A new solving scheme for modern e-commerce system framework is presented. And then, the solution of sharing function and data for each node of a modern business flow is designed including data reuse, elastic cart, order of automatic collection, trusteeship calculating of logistics cost request and automatic chamberlain based on Web Services. The new scheme improves the enormous efficiency of commercial affairs.

关键词： Logistics Companies Logic gates Business Web services Marketing and sales Synchronization

来源：评论

学校读者我要写书评

暂无评论

Analysis of Offline Fair Exchange Protocols in Strand Spaces

Analysis of Offline Fair Exchange Protocols in Strand Spaces

引用

International Conference on Computational Intelligence and Security

作者： Xiangdong Li Qingpu Guo Qingxian Wang Department of Network Engineering Information and Engineering University Zhengzhou Henan China Computer Center Henan University of Finance and Economics Zhengzhou Henan China

ISBN: (纸本)9781424441969

Formal and efficient protocol analysis by pen and paper is highly desired when informal and model-checking methods are not trusted in proving correctness of complicated e-commerce protocols. Based on strand spaces, this paper presents a method for fairness analysis of offline fair exchange protocols. With the new method, this paper formally analyzes an important offline fair exchange protocol -- the ASW certified email protocol, detects two flaws, and makes an improvement. The security analysis shows that such protocols as complicated as fair exchanges can be formally analyzed by pen and paper.

关键词： Protocols Logic Space technology Body sensor networks Authentication Research and development Computational intelligence Information security Finance Explosions

来源：评论

学校读者我要写书评

暂无评论

Cartoon repairing via color segmentation and Bézier curves

Cartoon repairing via color segmentation and Bézier curves

引用

IEEE International Conference on Ubi-Media Computing

作者： Chun-Hong Huang Jason C. Hung Nick C. Tang Ta-jen Chen Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taiwan Department of Information Technology Overseas Chinese Institute of Technology China Department of Computer Science and Information Engineering Tamkang University Taiwan

ISBN: (纸本)9781424418657

In this paper, we propose a new inpainting algorithm based on color segmentation to preserve the structure of image. We use color segmentation to construct contour lines, and estimate the slope of contour lines and how they should extend. We also use the advantage of Bezier curves that fit the curves to the real world. The algorithm also fit to more general cases.

关键词： Image segmentation Image edge detection Filters computer networks Information technology computer science Image reconstruction Rendering (computer graphics) Art Filling

来源：评论

学校读者我要写书评

暂无评论

Geographic convergecast in wireless sensor networks

Geographic convergecast in wireless sensor networks

引用

IFIP Wireless Days, WD

作者： Tzung-Shi Chen Hua-Wen Tsai Yu-Hsin Chang Department of Computer Science and Information Engineering National University of Tainan Tainan Taiwan Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Graduate Institute of Communication Engineering National University of Tainan Tainan Taiwan

This paper presents a novel Virtual Circle Combined Straight Routing (VCCSR) algorithm for a mobile sink to collect data in wireless sensor networks. Tree-based routing is a common scheme to collect data from sensors to a sink. Most of the previous proposed tree-like aggregation approaches are not suitable for mobile sink, because the routes between sink and sensors have to be reconstructed when a mobile sink moved. This causes a lot of link reconstruction to waste a lot of energy. The VCCSR algorithm is a structure-based routing with a virtual backbone. A set of cluster heads is located at the virtual backbone. When a mobile sink needs to collect data from sensors, a dynamic tree routing is constructed on the virtual backbone. Each cluster head is able to adjust tree routes when the mobile sink location is updated. This algorithm only needs to update the location information of mobile sink to a part of cluster heads to change their routing. This paper proposes a set of regular updating rules for the virtual structure to adjust routes effectively. The VCCSR algorithm is compared with tree-based algorithms in simulation. This paper demonstrates that a mobile sink can collect data and save energy effectively in a wireless sensor network. The VCCSR algorithm reduces the reconstructing cost so that it can prolong the network lifetime.

关键词： Wireless sensor networks Routing Costs Clustering algorithms Chemical and biological sensors Data engineering Mobile communication Spine Biosensors Animals

来源：评论

学校读者我要写书评

暂无评论

Programmable Numerical Function Generators for Two-Variable Functions

Programmable Numerical Function Generators for Two-Variable ...

引用

Euromicro Symposium on Digital System Design

作者： Shinobu Nagayama Jon T. Butler Tsutomu Sasao Department of Computer and Network Engineering Hiroshima City University Hiroshima Japan Department of Electrical and Electronics Engineering Naval Postgraduate School CA USA Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Japan

This paper proposes a design method and programmable architectures for numerical function generators (NFGs) of two-variable functions. To realize a two-variable function in hardware, we partition a given domain of the given function into segments, and approximate the function by a polynomial in each segment. This paper introduces two planar segmentation algorithms that efficiently partition a domain of a two-variable function. This paper also introduces two architectures that can realize a wide range of two-variable functions. Our architectures allow a systematic design of two-variable functions. FPGA implementation results show that, for a complicated function, our NFG achieves 58% of memory size and 39% of delay time of a circuit designed using one-variable NFGs.

关键词： Signal generators Design methodology Hardware computer architecture Polynomials Approximation error computer networks Design engineering Partitioning algorithms Signal processing algorithms

来源：评论

学校读者我要写书评

暂无评论

Efficient one-copy MPI shared memory communication in Virtual Machines

Efficient one-copy MPI shared memory communication in Virtua...

引用

IEEE International Conference on Cluster Computing

作者： Wei Huang Matthew J. Koop Dhabaleswar K. Panda Network-Based Computing Laboratory Department of Computer Science and Engineering Ohio State Uinversity Colombus OH USA

Efficient intra-node shared memory communication is important for high performance computing (HPC), especially with the emergence of multi-core architectures. As clusters continue to grow in size and complexity, the use of virtual machine (VM) technologies has been suggested to ease the increasing number of management issues. As demonstrated by earlier research, shared memory communication must be optimized for VMs to attain the native-level performance required by HPC centers. In this paper, we enhance intra-node shared memory communication for VM environments. We propose a one-copy approach. Instead of following the traditional approach used in most MPI implementations, copying data in and out of a pre-allocated shared memory region, our approach dynamically maps user buffers between VMs, allowing data to be directly copied to its destination. We also propose a grant/mapping cache to reduce expensive buffer mapping cost in VM environment. We integrate this approach into MVAPICH2, our implementation of MPI-2 library. For intra-node communication, we are able to reduce the large message latency in VM-based environments by up to 35%, and increase bandwidth by up to 38% even as compared with unmodified MVAPICH2 running in a native environment. Evaluation with the NAS Parallel Benchmarks suite shows up to 15% improvement.

关键词： Receivers Protocols Libraries Kernel Pipelines Virtual machine monitors Driver circuits

来源：评论

学校读者我要写书评

暂无评论

End-User IPTV Traffic Measurement of Residential Broadband Access networks

End-User IPTV Traffic Measurement of Residential Broadband A...

引用

IEEE network Operations and Management Symposium Workshops (NOMS Workshops)

作者： Young J. Won Mi-Jung Choi Byung-Chul Park James W. Hong Hee-Won Lee Chan-Kyu Hwang Jae-Hyoung Yoo Department of Computer Science & Engineering POSTECH Pohang South Korea Network Technology Laboratory Daejeon South Korea

ISBN: (纸本)9781424420674

Offering IPTV to broadband access subscribers is a key challenge as well as a prospective revenue source for ISPs. Despite of its growing interest, no comprehensive study has presented the traffic details of real-world commercial IPTV services yet. We have measured commercial IPTV traffic via four different residential broadband access networks, namely xDSL, Cable, FTTB, and FTTH. In this paper, we present traffic statistics and insight of the IPTV traffic impact onto these end- subscriber broadband accesses. We also present the mathematical formulas to describe traffic behavior and bandwidth demand in IPTV VoD services.

关键词： IPTV Telecommunication traffic Traffic control Bandwidth Streaming media US department of Transportation Peer to peer computing Optical fiber subscriber loops Statistics Optical fiber cables

来源：评论

学校读者我要写书评

暂无评论

Wireless Mesh Infrastructure for Ubiquitous Voice and Video

Wireless Mesh Infrastructure for Ubiquitous Voice and Video

引用

Consumer Communications and networking Conference, CCNC IEEE

作者： Liang Song Dimitrios Hatzinakos Xiaoyu Wang Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada OMESH Network Inc. Toronto

Here is to propose a demonstration of opportunistic wireless mesh networks for broadband wireless Internet access, supporting real-time services, e.g., of voice and video. The enabling technology is of the large-scale cognitive networking, which opportunistically utilizes network resources including both spectrum bandwidth and mesh radio (station) availability. We further demonstrate that: (1) vast saving in the deployment/planning costs of wireless mesh networks can be achieved by establishing fluid networks without predetermined topology; (2) Better (opportunistic) network resource utilization can be achieved to establish reliable communications over multiple wireless hops. The network performance therefore reaches its instantaneous maximum.

关键词： Wireless mesh networks IP networks Web and internet services Large-scale systems Bandwidth Availability Costs network topology Resource management Telecommunication network reliability

来源：评论

学校读者我要写书评

暂无评论

Markov Chain Induced by Random Dynamical System on Graph

引用

Chinese Quarterly Journal of Mathematics 2008年第2期23卷 207-214页

作者： ZHENG Jie LIU Chao-yang Department of Applied Mathematics Donghua University Shanghai 201620 China Zhengzhou Dongxifang Computer Network Engineering Limited Henan University Zhengzhou 450008 China

In this paper, we define a model of random dynamical systems（RDS） on graphs and prove that they are actually homogeneous discrete-time Markov chains. Moreover, a necessary and sufficient condition is obtained for th... 详细信息

关键词： random dynamical system（RDS） Markov chain communicate

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：