作者机构：
[陈矛] Engineering Center for Educational Information Technology, Huazhong Normal University, Wuhan 430079, China;[陈矛; 黄文奇] School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
通讯机构：
Engineering Center for Educational Information Technology, Huazhong Normal University, China
摘要：
Fiber Bragg grating (FBG) sensors are of particular interest for applications in the high voltage environments of electric power industry. The study on the parameter examination and health monitor of the electric power apparatus has great social significance and economic benefits. In this paper, the electric field or voltage sensor is constructed by using the electrostriction material PZT combined with the FBG, while the magnetic field or current sensor is based on the giant magnetostriction material (GMM). The characteristics of FBG strain, the relationship between the electrostriction displacement of piezoelectric ceramic (PZT) material and the excitation voltage, relationship of the magnetostriction displacement with excitation current, are analyzed respectively. The designed intelligent electrostrictive and magnetostrictive sensors are both with temperature compensation. In each sensor, two FBG's are bonded in perpendicular to each other that the electrostictive or magnetostrictive effects on the two gratings are added together, while the temperature effects are cancelled out. These electrical parameter sensors can be widely used for fault diagnosis in electrical substation. The development trend and applications of FBG sensors for power system are discussed.
摘要：
In order to meet the personalized E-learning, a personalized E-learning system based on Mobile Agents (PESMA) was proposed and realized in the paper. The structure of system, work process, key realization technologies of PESMA, the design of mobile agent, and the realization of mobile agent were introduced in the paper. After the test use of the system by certain network school, we found that the system could improve the learners' initiative participation, which can provide learners with personalized knowledge service. Thus, we thought it might be a practical solution to realize self- learning and self-promotion in the lifelong education age.
作者机构：
[程文青; 杨宗凯; 朱晓亮; 杜旭] Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;[朱晓亮] Engineering Research Center for Education Information Technology, Huazhong Normal University, Wuhan 430079, China
通讯机构：
Department of Electronics and Information Engineering, Huazhong University of Science and Technology, China
关键词：
移动自组织网络;流媒体;TCP友好速率控制;链路层重传
摘要：
针对移动自组织网络(Mobile Ad hoc Networks,MANET)的特点和IEEE802.11的链路层重传机制和分包策略的不足,研究基于广义误码率(Generalized Bit Error Ratio,GBER)和参考无线包重传概率(Packet Retransmission Ratio,PRR)的时延约束方程理论和传输层包长调整方法,并设计基于时延约束的MANET流媒体传输可变包长TCP友好速率控制机制(Variable Packet size TCP-Friendly Rate Control,VPTFRC).与其他方案不同,该机制进一步考虑了无线包重传概率对于包长调整和TCP友好速率控制机制的影响,给出了这一机制的理论模型与相关计算的详细说明,仿真试验的结果验证了该方法在有效吞吐量、传输延时及抖动和TCP友好性方面优于TFRC协议.
作者机构：
[宁国勤; 彭烈新; 朱光喜; 卢小峰] Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;Department of Information Technology, Huazhong Normal University, Wuhan 430079, China
通讯机构：
Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, China
期刊：
IFIP Advances in Information and Communication Technology,2007年252:282-288 ISSN：1868-422X
作者机构：
[Zhan, Yihong] Cent China Normal Univ, Grad Dept, Wuhan, Peoples R China.;[Bai, Yu] Cent China Normal Univ, Informat Management Dept, Wuhan 430072, Peoples R China.;[Liu, Ziheng] Cent China Normal Univ, Dept Informat Technol, Wuhan 430072, Peoples R China.
会议名称：
Integration and innovation orient to e-society, volume 2 :
会议时间：
2007-01-01
会议地点：
Wuhan(CN)
会议论文集名称：
Integration and innovation orient to e-society, volume 2 :
摘要：
As technology has improved and collaborative software has been developed, virtual teams with geographically dispersed members spread across diverse physical locations have become increasingly prominent. Virtual team is supported by advancing communication technologies, which makes virtual teams able to largely transcend time and space. Virtual teams have changed the corporate landscape, which are more complex and dynamic than traditional teams since the members of virtual teams are spread on diverse geographical locations and their roles in the virtual team are different. Therefore, how to realize good governance of virtual team and arrive at good virtual team performance is becoming critical and challenging. Good virtual team governance is essential for a high-performance virtual team. This paper explores the performance and the governance mechanism of virtual team. It establishes a model to explain the relationship between the performance and the governance mechanisms in virtual teams. This paper is focusing on managing virtual teams. It aims to find the strategies to help business organizations to improve the performance of their virtual teams and arrive at the objectives of good virtual team management.
期刊：
IFIP Advances in Information and Communication Technology,2007年252:514-520 ISSN：1868-422X
通讯作者：
Wang, Shujuan
作者机构：
[Wang, Shujuan; Liu, Qingtang] Huazhong Normal Univ, Dept Informat Technol, Wuhan, Hubei, Peoples R China.;[Liu, Qingtang] Huazhong Normal Univ, Engn Res Ctr, Educ Informat, Wuhan, Hubei, Peoples R China.
通讯机构：
[Wang, Shujuan] H;Huazhong Normal Univ, Dept Informat Technol, Wuhan, Hubei, Peoples R China.
会议名称：
Integration and innovation orient to e-society, volume 2 :
会议时间：
2007-01-01
会议地点：
Wuhan(CN)
会议论文集名称：
Integration and innovation orient to e-society, volume 2 :
摘要：
The virtual learning community is an important application pattern of E-Learning. It emphasizes the cooperation of the members in the community, the members would like to share their learning resources, to exchange their experience and complete the study task together. This instructional mode has already been proved as an effective way to improve the quality and efficiency of instruction. At the present time, the virtual learning communities are mostly designed using static access control policy by which the access permission rights are authorized by the super administrator, the super administrator assigns different rights to different roles, but the virtual and social characteristics of virtual learning community make information sharing and collaboration a complex problem, the community realizes its instructional goal only if the members in it believe that others will offer the knowledge they owned and believe the knowledge others offered is well-meaning and worthy. This paper tries to constitute an effective trust mechanism, which could promise favorable interaction and lasting knowledge sharing.
期刊：
IFIP Advances in Information and Communication Technology,2007年252:437-444 ISSN：1868-422X
通讯作者：
Han, Lilong
作者机构：
[Yang, Zongkai; Han, Lilong; Liu, Qingtan] Huazhong Normal Univ, Dept Informat & Technol, Wuhan, Peoples R China.
通讯机构：
[Han, Lilong] H;Huazhong Normal Univ, Dept Informat & Technol, Wuhan, Peoples R China.
会议名称：
Integration and innovation orient to e-society, volume 2 :
会议时间：
2007-01-01
会议地点：
Wuhan(CN)
会议论文集名称：
Integration and innovation orient to e-society, volume 2 :
摘要：
In role-based access control (RBAC) permissions are associated with roles, and users are made members of appropriate roles thereby acquiring the roles' permissions. The principal motivation behind RBAC is to simplify administration. An appealing possibility is to use RBAC itself to manage RBAC, to further provide administrative convenience. In this paper we investigate one aspect of RBAC administration concerning assignment of users to roles. We define a role-based administrative model, called URA (User-Role Assignment), for this purpose and describe its implementation in the Oracle database management system. Although our model is quite different from that built into Oracle, we demonstrate how to use Oracle stored procedures to implement it.
期刊：
IFIP Advances in Information and Communication Technology,2007年251:330-336 ISSN：1868-422X
通讯作者：
Jiang, Ling
作者机构：
[Wang, Jixin; Jiang, Ling] Huazhong Normal Univ, Dept Informat Technol, Wuhan 430079, Peoples R China.;[Jiang, Ling] Huazhong Normal Univ, Engng Res Ctr Educ Informat Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Jiang, Ling] H;Huazhong Normal Univ, Dept Informat Technol, Wuhan 430079, Peoples R China.
会议名称：
Integration and innovation orient to e-society, volume 1 :
会议时间：
2007-01-01
会议地点：
Wuhan(CN)
会议论文集名称：
Integration and innovation orient to e-society, volume 1 :
摘要：
To meet the mobile communication development, the necessary choice for mobile operators is to build up a convergence management system for the value-added services, which should support multiple value-added services openly. This paper introduced a new convergent management system for different mobile data services, which was developed by the author. And it focused on the development of convergent management system of mobile data services. It discussed the architecture of convergent management system and described three main management methods of typical data services.
作者机构：
[黄德修; 刘德明; 杨春勇] Department of Optoelectronics Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;[吴绍靖] Department of Information Technology, Huazhong Normal University, Wuhan 430079, China;[杨春勇] School of Electronics Information Engineering, South-Central University of Nationalities, Wuhan 430074, China
通讯机构：
[Yang, C.-Y.] D;Department of Optoelectronics Engineering, Huazhong University of Science and Technology, China
