期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Interaction of Conormal Waves With Strong and Weak Singularities For Semi-Linear Equations
1
作者 Wang Weike Sheng Weiming(Department of Mathematics, Wuhan University, Wuhan 430072,China) 《Wuhan University Journal of Natural Sciences》 CAS 1996年第1期20-24,共5页
We first define a kind of new function space, called the space of twice conormal distributions. With some estimates on these function spaces, we can prove that if there exist two characteristic hypersurfaces bearing s... We first define a kind of new function space, called the space of twice conormal distributions. With some estimates on these function spaces, we can prove that if there exist two characteristic hypersurfaces bearing strong and weak singularities respectively intersect transversally, then some new singularities will take place anti their strength will be no more than the original weak one. 展开更多
关键词 semi-linear hyperbolic partial differential equation conormal distribution nonlinear wave energy estiMate
下载PDF
Distributed cooperative task planning algorithm for multiple satellites in delayed communication environment 被引量:2
2
作者 Chong Wang Jinhui Tang +2 位作者 Xiaohang Cheng Yingchen Liu Changchun Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第3期619-633,共15页
Multiple earth observing satellites need to communicate with each other to observe plenty of targets on the Earth together. The factors, such as external interference, result in satellite information interaction delay... Multiple earth observing satellites need to communicate with each other to observe plenty of targets on the Earth together. The factors, such as external interference, result in satellite information interaction delays, which is unable to ensure the integrity and timeliness of the information on decision making for satellites. And the optimization of the planning result is affected. Therefore, the effect of communication delay is considered during the multi-satel ite coordinating process. For this problem, firstly, a distributed cooperative optimization problem for multiple satellites in the delayed communication environment is formulized. Secondly, based on both the analysis of the temporal sequence of tasks in a single satellite and the dynamically decoupled characteristics of the multi-satellite system, the environment information of multi-satellite distributed cooperative optimization is constructed on the basis of the directed acyclic graph(DAG). Then, both a cooperative optimization decision making framework and a model are built according to the decentralized partial observable Markov decision process(DEC-POMDP). After that, a satellite coordinating strategy aimed at different conditions of communication delay is mainly analyzed, and a unified processing strategy on communication delay is designed. An approximate cooperative optimization algorithm based on simulated annealing is proposed. Finally, the effectiveness and robustness of the method presented in this paper are verified via the simulation. 展开更多
关键词 Earth observing satellite(EOS) distributed coo-perative task planning delayed communication decentralized partial observable Markov decision process(DEC-POMDP) simulated annealing
下载PDF
A Complex Algorithm for Solving a Kind of Stochastic Programming
3
作者 Yunpeng Luo Xinshun Ma 《Journal of Applied Mathematics and Physics》 2020年第6期1016-1030,共15页
Considering that the probability distribution of random variables in stochastic programming usually has incomplete information due to a perfect sample data in many real applications, this paper discusses a class of tw... Considering that the probability distribution of random variables in stochastic programming usually has incomplete information due to a perfect sample data in many real applications, this paper discusses a class of two-stage stochastic programming problems modeling with maximum minimum expectation compensation criterion (MaxEMin) under the probability distribution having linear partial information (LPI). In view of the nondifferentiability of this kind of stochastic programming modeling, an improved complex algorithm is designed and analyzed. This algorithm can effectively solve the nondifferentiable stochastic programming problem under LPI through the variable polyhedron iteration. The calculation and discussion of numerical examples show the effectiveness of the proposed algorithm. 展开更多
关键词 Stochastic Programming with Recourse Probability distribution with Linear partial Information Maximized Minimum Expectation Complex Algorithm
下载PDF
Discovering admissible Web services with uncertain QoS 被引量:3
4
作者 Xiaodong FU Kun YUE +2 位作者 Li LIU Ping ZOU Yong FENG 《Frontiers of Computer Science》 SCIE EI CSCD 2015年第2期265-279,共15页
Open and dynamic environments lead to inher- ent uncertainty of Web service QoS (Quality of Service), and the QoS-aware service selection problem can be looked upon as a decision problem under uncertainty. We use an... Open and dynamic environments lead to inher- ent uncertainty of Web service QoS (Quality of Service), and the QoS-aware service selection problem can be looked upon as a decision problem under uncertainty. We use an empiri- cal distribution function to describe the uncertainty of scores obtained from historical transactions. We then propose an approach to discovering the admissible set of services in- cluding alternative services that are not dominated by any other alternatives according to the expected utility criterion. Stochastic dominance (SD) rules are used to compare two services with uncertain scores regardless of the distribution form of their uncertain scores. By using the properties of SD rules, an algorithm is developed to reduce the number of SD tests, by which the admissible services can be reported pro- gressively. We prove that the proposed algorithm can be run on partitioned or incremental alternative services. Moreover, we achieve some useful theoretical conclusions for correct pruning of unnecessary calculations and comparisons in each SD test, by which the efficiency of the SD tests can be im- proved. We make a comprehensive experimental study using real datasets to evaluate the effectiveness, efficiency, and scal- ability of the proposed algorithm. 展开更多
关键词 Web services uncertain QoS partial preference empirical distribution function stochastic dominance admis-sible set
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部