齐勇
分布式系统、普适计算、中间件技术、移动计算和面向对象等方向
个性化签名
- 姓名:齐勇
- 目前身份:
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学术头衔:
博士生导师,
- 职称:-
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学科领域:
计算机软件
- 研究兴趣:分布式系统、普适计算、中间件技术、移动计算和面向对象等方向
齐勇,博士、教授、博士生导师,1987研究生毕业后在西安交通大学工作至今,现任西安交通大学计算机科学与技术系系主任,计算机软件与理论研究所副所长;获2002年教育部全国高等学校优秀骨干教师奖。兼任中国计算机学会理事,中国计算机学会系统软件专委会常委,陕西省计算机学会常务理事,“十五”国家863计划城市信息化技术总体组成员,国家教育部电子信息与电气教学指导委员会秘书长(2006-2010),以及多个学术会议的程序委员会成员和分会主席。主要研究方向:分布式系统、普适计算、中间件技术、移动计算和面向对象等方向。负责主持过国家863重点项目、国家自然基金、省部级科研课题,以及国际合作科研课题近20项,获得省部级科技进步奖3项,发表论文40余篇,取得软件登记著作权6项,申请发明专利3项。
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617
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成果数
13
齐勇, 张庆生, 沈均毅, 赵季中, 候迪, 赵天海
,-0001,():
-1年11月30日
用户活动的传感器记录是其在装有简单普适传感器的智能空间中交互所产生的上下文信息,使用这些上下文信息可以感知用户活动。有关研究表明手工标记等方法对这些传感器记录分类是不准确和费时的,而且用于聚类这些传感器数据的特征值还不足以得到很好的聚类效果。因此,本文研究如何根据活动理论从传感器记录中提取特征值动作链,并且用k-平均和层次聚类算法对所提取的特征值和活动时间进行聚类,从而实现对活动数据进行标记。本文提出了一种关于用户活动的传感器记录的特征值提取方法,用来改善这类数据的标记过程,为以后的应用提供训练样本。
特征抽取, 动作链, 聚类, 上下文感知
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【期刊论文】Application Server Aging Model and Multi-level Rejuvenation Strategy Using Semi-Markov Process
齐勇, ZHAO Tianhai, QI Yong, SHEN Junyi*, HOU Di, ZHENG XiaoMei, LIU Liang
,-0001,():
-1年11月30日
Aiming at the characteristic of the dependency between the application components and the application server platform, a rejuvenation strategy with two different levels of rejuvenation granularities is put forward in this paper including the application component rejuvenation and the application server system rejuvenation. The availability and maintenance cost functions are obtained by means of establishing the application server aging model and the boundary condition of the optimal rejuvenation time is analyzed. Theory analysis indicates that the two-level rejuvenation strategy is superior to the traditional single level one. Finally, evaluation experiments are carried out and numerical result shows that compared with the traditional rejuvenation policy, the rejuvenation strategy proposed in this paper can further increase availability of the application server and reduce maintenance cost.
application server, software rejuvenation, reliability, software maintenance CLC number, P228., 4
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【期刊论文】A Balanceable Task Allocation Algorithm of Mobile Agent Based on Ad Hoc Network*
齐勇, Fan Wei, Yong Qi, Jizhong Zhao, Pu Sheng
Jul. 2006, Volume 3, No.7 (Serial No.20),-0001,():
-1年11月30日
A novel algorithm of task allocation of mobile agent in ad hoc network is introduced in this paper. This algorithm extends the task oriented negotiation method to task allocation of n-people cooperation, makes the allocation balanceable to satisfy agents as much as possible. This algorithm also reduces the whole cooperation cost a lot. The simulation result is given at the end, and it proves that this algorithm is very useful in ad hoc network.
Cooperation, Task Oriented, Market Bidding, Task Allocation, Ad Hoc
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24浏览
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【期刊论文】OTMSA CORBA-compliant object Transaction Management System
齐勇, Qi Yong, Ma Li, Zhao Jizhong, Shen Junyi
,-0001,():
-1年11月30日
gy,the computer application under distributed environment has become a trend of development. However,the even higrher requirement of the data consistency and integrality under the distributed environment makes the traditional transaction process technology incompetent. To meet the new challenge,the Object Transaction Service model for distributed application environment was proposed,it combines both the traditional transaction process technology and the distributed object technology. The Object Transaction Management System (OTMS) we implemented was based on the OTS Mol,which providesfull capability of transaction service and management. Both the theory and the concrete implement technology of Object Transaction Management System are presented in this PapeF.
Middleware, Distributed Application Environment, Distributed Object Technology, Application Server, Oect Transaction Management System
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【期刊论文】Software Aging Prediction Model Based on Fuzzy Wavelet Network with Adaptive Genetic Algorithm
齐勇, Meng Hai Ning, Qi Yong, Hou Di, Chen Ying, Zhao Ji Zhong
,-0001,():
-1年11月30日
According to the characteristics of the operational behavior and runtime state of application sever, the resource consumption time series are observed and modeled by fuzzy wavelet network (FWN) with fuzzy logic inference and learning capability. The objective is to model the extracted data series of systematic performance parameters to predict software aging in application server. The dimensionality of input variables of FWN is reduced by principal components analysis (PCA), and the structure and parameters of FWN are optimized with adaptive genetic algorithm (GA). Judging by the model, we can get the aging threshold before application server failed and preventively maintenance the application server before systematic parameter value reaches the threshold. The experiments are carried out to validate the efficiency of the proposed model and show that the aging prediction model based on FWN with adaptive genetic algorithm is superior to the neural network (NN) model and wavelet network (WN) model in the aspects of convergence rate and prediction precision.
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齐勇, Meng Hai Ning, PQI Yong, Hou Di, Liu Liang, He Hui
,-0001,():
-1年11月30日
Software aging is an important factor that affects the software reliability. According to the characteristic of performance parameters of application sever middleware, a new model for software aging prediction based on wavelet networks is proposed. The structure and parameters of wavelet network are optimized with genetic algorithm and simulated annealing algorithm. The objective is to observe and model the existing resource usage time series of application server middleware to predict accurately future unknown resource usage value. Judging by the model, we can get the aging threshold before application server fails and rejuvenate the application server before systematic parameter value reaches the threshold. The experiments are carried out to validate the efficiency of the proposed model, and show that the aging prediction model based on wavelet network with hybrid genetic algorithm is superior to the BP neural network model and wavelet network model in the aspects of convergence rate and prediction precision.
application server, middleware, software aging, software rejuvenation, time series prediction, wavelet network, genetic algorithm, simulated annealing algorithm
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23浏览
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【期刊论文】The Optimal Rejuvenation Schedule Driven by Maintenance Cost in Application Server
齐勇, Zhao Tianhai, Qi Yong, Shen Junyi, Hou Di, Zheng Xiaomei
Journal of Communication and Computer,Aug.2006, Volume 3, No.8 (Serial No.21),-0001,():
-1年11月30日
The unplanned system crash in application server leads to huge maintenance cost. In order to reduce the maintenance cost and prevent the failure, the optimal rejuvenation schedule is put forward based on the degradation of application server. Further, the degradation process of application server is modeled and the long-term cost is analyzed by renew processes theory. Then the boundary condition of the optimal rejuvenation schedule is discussed. Finally, the numerical result shows that the optimal rejuvenation schedule can further reduce the maintenance cost of application server.
Application Server, Rejuvenation, Maintenance Cost, Renew Processes
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【期刊论文】基于Web 的中间件系统集成框架——应用服务器的研究
齐勇, 赵季中, 侯迪, 沈钧毅, 曾斌异
计算机研究与发展,2001,38(4):433~437,-0001,():
-1年11月30日
以“八六三”项目为背景,在探讨应用服务器技术、组件和框架技术的基础上,通过结合CORBA开放性、跨平台、跨语言的特性和EJB业务处理能力,设计并实现了一个可伸缩、健壮的、支持Web分布式应用的中间应用服务器系统平台,其功能包括:组件容器、管理控制台、事务服务、外部资源管理、名字服务等;并在实际中得到了初步应用,取得了很好的效果。与其它方式的服务相比,它有着易于开发、易于管理和易于加载服务等特点。对其理论背景、体系结构、关键技术以及其上的应用领域框架等进行了全面的研究。
应用服务器, 构件, 核心框架, 派生框架, CORBA, EJB, XML
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齐勇, 赵天海, 沈钧毅, 郑晓梅
西安交通大学学报,2006,40(2):152~156,-0001,():
-1年11月30日
针对企业Java业务组件(EJB)的负载请求特点,提出了基于关联对象组的EJB负载分配算法(ROGRD)。该算法对集群环境下的EJB资源创建情况进行划分,并根据划分的集合在排队论系统模型的基础上建立了代价函数和回报函数,然后依据不同的请求类型,且在请求内容的分布,服务器的负载状况以及服务器的处理性能的衰减3个约束条件下,获得代价最小而回报最大分配方案。实验结果表明,ROGRD比基于位置的请求分配算法的响应时间减少了11%,吞吐量提高了2815%。
企业Java组件, 请求分配算法, 关联对象组
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【期刊论文】基于软件老化累积损伤模型的应用服务器再生策略研究
齐勇, 赵天海, 沈钧毅, 侯迪, 郑晓梅, 钟虓
系统仿真学报,2006,18(2):2~5,-0001,():
-1年11月30日
基于软件老化现象机理的分类研究,针对资源消耗尽而导致的系统性能衰减和处理容量的下降原因,考虑应用服务器组件和平台之间的老化依赖关系特征,本文提出了软件老化累积损伤的应用服务器再生模型,采取等间隔时间的部分再生和基于资源阈值的两种软件再生的执行策略。获得了应用服务器的维护费和可靠性用函数,同时分析了最优再生时间的边界条件。仿真试验给出了不同内存资源阈值下的,应用服务器的最优再生时间间隔以及变化趋势。
应用服务器, 软件再生, 维护代价, 老化积累损伤模型
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