作者机构：
[Tan, LS; Yang, Y; Xiong, NX] Cent China Normal Univ, Dept Comp Sci, Wuhan, Hubei Province, Peoples R China.
通讯机构：
[Tan, LS] C;Cent China Normal Univ, Dept Comp Sci, Wuhan, Hubei Province, Peoples R China.
关键词：
BP neural network;congestion control;data transmission;computer network
摘要：
In this paper, a novel congestion control scheme is proposed which is based on a Back Propagation (BP) neural network method. The BP neural network predicts the dynamic buffer occupancy of the bottleneck node. The proposed control scheme avoids congestion efficiently and optimizes the transmission performance as shown by the theoretic analysis and simulation results.
期刊：
Proceedings - The Fourth International Conference on Computer and Information Technology, CIT 2004,2004年:364-368
通讯作者：
Yang, Y
作者机构：
[Tan, LS; Yang, Y; Xiong, NX] Cent China Normal Univ, Dept Comp Sci, Hubei Wuhan 430079, Peoples R China.
通讯机构：
[Yang, Y] C;Cent China Normal Univ, Dept Comp Sci, Hubei Wuhan 430079, Peoples R China.
摘要：
With the rapid advances in Internet and Grid technique, an increasing number of applications will involve computing systems. These applications in turn create an increasing demand for efficient resource management, request handling policies and admission control. In this paper, we propose an efficient admission control algorithm to protect the critical resource of server and improve the performance of the computing system. Stability of CPU utilization is aimed to protect the server from overload and under-load. It is then beneficial to keep a satisfactory response time of requests, high throughput and less potential loss of service. We analyze the stability in detail and present a method for tuning control gains in order to guarantee the system stability. Finally, we perform simulations to evaluate the performance of the proposed algorithm. Simulation results demonstrate that the proposed algorithm stabilizes the utilization of CPU in the computing system if the control gains are appropriately chosen on the basis of system stability, it then achieves satisfactory performance.
作者：
SHUANGHUA YANG DEPARTMENT OF COMPUTER SCIENCE;LOUGHBOROUGH UNIVERSITY;LOUGHBOROUGH;LEICESTERSHIRE;LE TU UK LIANSHENG TAN DEPARTMENT OF COMPUTER SCIENCE（谭连生）;...
期刊：
国际自动化与计算杂志,2004年1(1):1-9 ISSN：1476-8186
通讯作者：
Shuanghua Yang
作者机构：
[SHUANGHUA YANG DEPARTMENT OF COMPUTER SCIENCE] Department of Computer Science, Loughborough University, Loughborough, UK;[LE TU UK LIANSHENG TAN DEPARTMENT OF COMPUTER SCIENCE] Department of Computer Science, Central China Normal University, Wuhan, PRC;[Guo-Ping Liu] School of Electronics, University of Glamorgan, Prontypridd, UK
通讯机构：
[Shuanghua Yang] D;Department of Computer Science, Loughborough University, Loughborough, UK
关键词：
Internet;based;CONTROL;CONTROL;system;ARCHITECTURES;requirements;specification;FUNCTIONAL;model;information;architectures.;Internet based control;control system architectures;requirements specification;functional model;information architectures
摘要：
The Internet is playing an important role in information retrieval, and additionally industrial process manipulation. This paper describes an approach to writing requirements specifications for Internet-based control systems, from which architectures can be derived. The requirements specifications developed are described in terms of a functional model, which is then extended to form an information architecture. Distinct from the functional model, the information architecture provides an indication as to the architectural structure of subsequently developed Internet-based control systems. Three general control structures are generated from the analysis of an information architecture. An integrated-distributed architecture is derived as an ideal implementation, in which a control system is linked to the Internet at all levels of a control system hierarchy.
摘要：
In recent years, the Internet has proved to be a powerful tool for real-time applications. However, security risk of the Internet communication still stops people to bring the real-time application into a reality. Little work has so far been done in developing a data encryption algorithm for Internet-based real-time applications. In order to satisfy the security requirements of Internet-based real-time systems, two hybrid data encryption algorithms are proposed. One is the combination of the Advanced Encryption Standard (AES) and the most popular public-key cryptography (RSA); the other is the combination of the AES and Secure Sockets Layer (SSL). The end-to-end encryption latency of different algorithms is investigated to show the efficiency of the two new algorithms for Internet-based real-time applications.
摘要：
ATM网络是一类虚拟的电路交换网络，它融入了电路交换技术和包交换技术。在这两个系统融入以前它们是独立的，若要五相通信必须获得彼此的通信参数才能建立虚拟连接。而TM网络通过存储技术和统计复用来共享网络资源，网络资源的共享使得通信费用大大减少。ATM是以定长的信元(cell)作为高速通信信息的载体，它具有高速、低比特借误率、动态分配带宽和高复合能力的优点，这些使得它非常适宜于需要保证服务质量(Quality of Service, QoS)的多媒体数据流。由于多媒体业务流的特性，常引起网络拥塞并降低服务的质量。因此必须采取一定的流量管理控制机制来避免网络的拥塞。
作者机构：
[Tan, LS; Chen, L; Yin, M] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Tan, LS] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
会议名称：
International Conference on Communication Technology
会议时间：
APR 09-11, 2003
会议地点：
BEIJING, PEOPLES R CHINA
会议主办单位：
Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
关键词：
ABR service;high-speed computer networks;congestion control;PID controller;performance evaluation
摘要：
In this paper, we present a novel control-theoretic explicit rate (ER) allocation algorithm for congestion control of available bit rate (ABR) service in high-speed computer communication networks. The proposed control uses a proportional-integrative-plus-derivative (PID) controller rather than the usually adopted proportional-plus-derivative (PD) controller. Based on a general traffic model of computer network and on system stability criterion, it is shown that under PID controller the source rates are regulated in such a manner that the congestion-controlled network is asymptotic stable in terms of both the buffer occupancy of the destination node and the user transmission rates, and the bandwidth fairness is achieved. The basic control theory approach for the algorithm is firstly presented, specifically z-transformation and Schur-Cohn stability test are used to achieve the stability. Steady state analysis is subsequently given to show how the max/min fairness is achieved in a natural way without additional computation. We then use simulations to compare the performance of the PID congestion control scheme with the PD control scheme under a variety of networking conditions and loads. Our simulation results show that certain PID scheme produces advantages over PD scheme, namely PID control scheme leads to less buffer occupancy, faster response of the buffer occupancy as well as of the controlled ABR rates, smaller steady overshoots of ABR traffic and better utilization of network links.
摘要：
In large computer network, the isolation of the primary source of failure is a challenging task. In this paper, we present a novel approach of modeling network fault diagnosis. With the model based on reachable theorems, we design an automated fault identification algorithm and analyze its performance and validity named as DAFMA. To judge the consistency between the fault effect of the given failure sources and the testing one, an efficient algorithm is also proposed named as FFEAJ. DAFMA can be carried out automatically in computer because both DAFMA and FFEAJ are based on matrix and Boolean operations. Finally, to illustrate the details of DAFAM, four classical fault effects are classified and the working steps of DAFAM are described.
摘要：
To guarantee network Quality of Service (QoS), network controllers designed and applied in real networks are necessary. How to automatically find efficient parameters of a controller and get the setting time of control system in simulation is a common problem in the process of controller design. Some definitions, experience rules and algorithms based on statistical theory are proposed in this paper, which are able to get the setting time, judge the stability feature of network control system and compare the control effects of different controllers. We tested the algorithms with network congestion controllers and the experiments results show that they are efficient to network controller evaluation, which enlarge the testing range and facilitate controller design.
