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.
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.
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.
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.
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.
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.
期刊：
PACLIC 17: Language, Information and Computation, Proceedings,2003年:235-242
作者机构：
[He, TT; Luo, CR] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
摘要：
In this paper, vector-distance-weighted algorithm and representative-vector-distance algorithm are described and used to implement the process of automatic text classification. Two experiments have been done by means of the algorithms (experiment1 is based on vector-distance-weighted algorithm and experiment2 is based on representative-vector-distance algorithm). Characters are selected as features. The average precision of experiment1 and experiment2 is 80.36% and 69.27%, respectively. Comparing the two experiments, it can be concluded that the efficiency of text classification can be improved by means of vector-distance-weighted algorithm.
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.
摘要：
The goal of this paper is to research the topology discovery of a computer network algorithms. Sonic key techniques Of backbone topology discovery are discussed in detail, and sonic Solutions are proposed, Such as how to ascertain the link relations of network equipments, how to mark a router, how to avoid a router being accessed repeatedly, and how to distinguish a router from gateway. This paper also analyses the principle of subnet topology discovery and presents a method for discovering the live hosts in a subnet. On these basis, a backbone topology discovery algorithm and a subnet topology discovery algorithm are designed by ourselves. and the complexity of these algorithims are analysed. At last all the algorithms are implemented successfully in object oriented language-JAVA2.
作者机构：
[Tan, LS; Yu, YJ; Liu, Q; Xiao, DB] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Yu, YJ] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
关键词：
network management;control theory;SNMP;closed-loop control;real time
摘要：
Network management system (NMS) is required not only to have network performance monitoring function but also to have automated real time network control. Most NMSs configure devices manually without processing data from SNMP agents. In order to make it, automatic, it's suggested that automated NMS should be built based on SNMP and control theory. This proposed that Manager-Agent network management model is similar to the closed-loop control model. According to device features, local network control systems are divided into two kinds, one is switch control, and the other is server control. The engineering implementations of the two control systems are analyzed in detail. How to choose a sampling time in network control system is discussed because it's difficult in almost every network control system design. We find that sampling time should be close to the agent sampling time of devices in centralized control model, and it should be also larger than time delay of Internet in distributed network control model. To show how to realize network management with control theory,,an example about admission control system in a genetic algorithm computing server is illustrated step by step and control effects are tested. The experiments results support the novel approach is efficient to automated network management.
作者机构：
[Tan, LS; Yu, YJ; Liu, Q] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Yu, YJ] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
关键词：
TSP;CORBA;Java;genetic algorithm;DGAandCORBA
摘要：
Distributed Genetic Algorithm (DGA) has been used to parallel computing and, Common Object Request Broker Architecture (CORBA) is, popular in software integration. In order to reduce the complexity of DGA software development and to minimize the maintenance costs, DGA software with CORBA and Java (DGAandCORBA) is proposed. The advantages and software architecture of DGAandCORBA are illustrated in detail. China Traveling Salesman Problem (CTSP) has been computed with different parameters and three rules about parameters selections are exposed. It's shown that the solution quality with best-migration policy is the same as that of random-migration policy, the good solution is easily available both in the case when migration rate is about 20parts per thousand. and reproduction generation is between 25,000, and 30,000. Finally, Several experiments are carried out to verify these rules. Experiments show the efficiency of our approach in solving TSP.
作者机构：
[Zheng, SJ; Zhang, JL] Cent China Normal Univ, Dept Comp Sci, Wuhan 430074, Hubei, Peoples R China.
通讯机构：
[Zheng, SJ] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430074, Hubei, Peoples R China.
关键词：
WDD;cluster system;data storage;software RAID;Virtual Disk Drives;Virtual Router
摘要：
This paper, we discuss the Methods of Data Storage Using WWD & Cluster Software RAID, describe the WDD a large scale multi-wavelength network in essence can be considered like a large disk drive, with each wavelength being a separate track and specialized routers with the WDD software acting as record, analyze Data Storage using Cluster Software RAID, and, look forward application technology of WDD in the future.
摘要：
The present paper proposes a control-theoretic approach to design rate-based controllers in order to flow-regulate the best-effort service and guaranteed service traffic through asynchronous transfer mode (ATM) switching networks. Classical control theory and Schur-Cohn stability criterion are exploited to design the traffic controllers for ATM switching networks. The stability and transient response of closed-loop congestion controlled systems are analyzed by utilizing Schur-Cohn stability criterion, which leads to certain necessary and sufficient stability condition under which the controlled ATM switching network is asymptotically stable in terms of buffer occupancy. Such proposed stability condition is then shown to be a key tool in designing a wide scope of adaptive controllers. Simulations are performed that show good performance of such controlled networks.
期刊：
WORLD MULTICONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL XVII, PROCEEDINGS: CYBERNETICS AND INFORMATICS: CONCEPTS AND APPLICATIONS (PT II),2001年:119-125
通讯作者：
Wei, CH
作者机构：
[Wei, CH; Wang, S] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Wei, CH] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
