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.
作者机构：
[金聪; 彭嘉雄] State Key Laboratory of Education, Huazhong Univ. of Sci. and Technol., Min. Image Proc./Intelligent Contr., Wuhan 430074, China;[金聪] Department of Computer Science, Central China Normal University, Wuhan 430079, China
通讯机构：
[Jin, C.] S;State Key Laboratory of Education, Huazhong Univ. of Sci. and Technol., Min. Image Proc./Intelligent Contr., China
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.
作者机构：
[李蔚; 何军; 刘德明; 黄德修] Department of Optoelectronic Engineering, Huazhong University of Science and Technology;[李源] Department of Computer Science, Central China Normal University
通讯机构：
[Li, W.] D;Dept. of Optoelectron. Eng., Huazhong Univ. of Sci. and Technol., China
关键词：
Genetic algorithms;Optical networks
摘要：
In a wavelength routing optical network (WRON), the optimal allocation of wavelength converters (WCs) is very important to minimize the number of WCs, enhance the fiber utilization, reduce the blocking probability, etc.. In this paper, a novel simplified network model with shared WCs has been proposed. An effective algorithm for optimal allocation of shared WCs has been presented by using a revised Dijkstra algorithm and genetic algorithm (GA). The effectiveness of the revised algorithm was verified through the simulation on Nature and Science Foundation (NSF) net of USA. This revised algorithm can achieve blocking probability 36% less than the algorithm in previous work, and the calculating time of the minimum blocking probability can be reduced dramatically.
作者机构：
[黄德修; 刘德明; 何军; 李蔚; 杨春勇] Dept. of Optoelectron. Eng., Huazhong Univ. of Sci. and Technol., Wuhan 430074, China;[李源] Dept. of Comp. Sci., Central China Normal Univ., Wuhan 430070, China
通讯机构：
[Li, W.] D;Dept. of Optoelectron. Eng., Huazhong Univ. of Sci. and Technol., China
期刊：
IEEE/WIC/ACM INTERNATIONAL CONFERENCE ON WEB INTELLIGENCE (WI 2004), PROCEEDINGS,2004年:481-484
通讯作者：
Liu, HY
作者机构：
[Liu, HY] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, HY] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
摘要：
In this paper, we propose content-based video retrieval, which is a kind of retrieval by its semantical contents. Because video data is composed of multimodal information streams such as visual, auditory and textual streams, we describe a strategy of using multimodal analysis for automatic parsing sports video. The paper first defines the basic structure of sports video database system, and then introduces a new approach that integrates visual streams analysis, speech recognition, speech signal processing and text extraction to realize video retrieval. The experimental results for TV sports video of football games indicate that multimodal analysis is effective for video retrieval by quickly browsing tree-like video clips or inputting keywords within predefined domain.
期刊：
Lecture Notes in Computer Science,2004年3332:197-204 ISSN：0302-9743
通讯作者：
Liu, HY
作者机构：
[Liu, HY] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Hubei, Peoples R China.;Wuhan Univ, Dept Finance, Sch Business, Wuhan 430072, Hubei, Peoples R China.
通讯机构：
[Liu, HY] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Hubei, Peoples R China.
摘要：
An advanced content-based news video browsing and retrieval system, NewsBR, is proposed in this work. The system is built on high-accuracy news story segmentation and topic caption text extraction. Its main features include category-based news story browsing, key-frame-based video abstract and keyword-based news story retrieval. In the paper, news story segmentation and topic caption text extraction, as well as content-based video browsing and retrieval, are addressed in detail. The system is helpful and effective for the overall understanding of the news video content.
期刊：
Proceedings - The Fourth International Conference on Computer and Information Technology, CIT 2004,2004年:1159-1164
通讯作者：
Hu, P
作者机构：
[He, TT; Hu, P; Ji, DH; Wang, M] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Hu, P] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
摘要：
Automatic Summarization is an important research issue in natural language processing. This paper presents a special summarization method to generate single-document summary with maximum topic completeness and minimum redundancy. It initially implements the semantic-class-based vector representations of various kinds of linguistic units in a document by means of HowNet (an existing ontology), which can improve the representation quality of traditional term-based vector space model in a certain degree. Then, by adopting K-means clustering algorithm as well as a novel clustering analysis algorithm, we can capture the number of different latent topic regions in a document adoptively. Finally, topic representative sentences are selected from each topic region to form the final summary. In order to evaluate the effectiveness of the proposed summarization method, a novel metric which is known as representation entropy is used for summarization redundancy evaluation. Preliminary experimental results show that the proposed method outperforms the conventional basic summarization method under the evaluation scheme when dealing with diverse genres of Chinese documents with free writing style and flexible topic distribution.
期刊：
PACLIC 17: Language, Information and Computation, Proceedings,2003年:282-289
作者机构：
[He, TT; Xiaohua, LH; Liu, JZ] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
摘要：
Automatic Multi-word Units Extraction is an important issue in Natural Language Processing. This paper has proposed a new statistical method based on a large-scale balanced corpus to extract multi-word units. We have used two improved traditional parameters: mutual information and log-likelihood ratio, and have increased the precision for the top 10,000 words extracted through the method to 80.13%. The results of the research indicate that this method is more efficient and robust than previous multi-word units extraction methods.
作者机构：
[Shengsheng Yu] College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, China;Department of Computer Science, Central China Normal University, Wuhan, China;[Jingzhong Mao] Department of Mathematics, Central China Normal University, Wuhan, China;[Kaihua Xu] Educational Informatization Research Center, Central China Normal University, Wuhan, China;[Yuhua Liu] College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, China<&wdkj&>Department of Computer Science, Central China Normal University, Wuhan, China
通讯机构：
[Yuhua Liu] C;College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, China<&wdkj&>Department of Computer Science, Central China Normal University, Wuhan, China
关键词：
maximum flow;minimum cutset;capacity-expanded network;optimization algorithm
摘要：
The paper points out the relationship between the bottleneck and the minimum cutset of the network, and presents a capacity expansion algorithm of network optimization to solve the network bottleneck problem. The complexity of the algorithm is also analyzed. As required by the algorithm, some virtual sources are imported through the whole positive direction subsection in the network, in which a certain capacity value is given. Simultaneously, a corresponding capacity-expanded network is constructed to search all minimum cutsets. For a given maximum flow value of the network, the authors found an adjustment value of each minimum cutset arc’s group with gradually reverse calculation and marked out the feasible flow on the capacity-extended networks again with the adjustment value increasing. All this has been done repeatedly until the original topology structure is resumed. So the algorithm can increase the capacity of networks effectively and solve the bottleneck problem of networks.
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.
作者机构：
[Liu, YH] Huazhong Univ Sci & Technol, Coll Comp Sci & Technol, Wuhan 430074, Peoples R China.;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Dept Math, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Educ Informat Res Ctr, Wuhan 430079, Peoples R China.
关键词：
maximum flow;minimum cutset;capacity-expanded network;optimization algorithm.
摘要：
The paper points out the relationship between the bottleneck and the minimum cutset of the network, and presents a capacity expansion algorithm of network optimization to solve the network bottleneck problem. The complexity of the algorithm is also analyzed. As required by the algorithm, some virtual sources are imported through the whole positive direction subsection in the network, in which a certain capacity value is given. Simultaneously, a corresponding capacity-expanded network is constructed to search all minimum cutsets. For a given maximum flow value of the network, the authors found an adjustment value of each minimum cutset arc's group with gradually reverse calculation and marked out the feasible flow on the capacity-extended networks again with the adjustment value increasing. All this has been done repeatedly until the original topology structure is resumed. So the algorithm can increase the capacity of networks effectively and solve the bottleneck problem of networks.
