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.

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.

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.

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.

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。