共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
朱帮助 《小型微型计算机系统》2009,30(5)
针对多属性决策中的高维、非线性问题,提出一种基于粗糙集和粒子群优化神经网络的智能多属性决策方法.该方法利用粗糙集对多属性决策问题的条件属性进行约简,利用粒子群算法训练神经网络的权重和阈值形成粒子群优化神经网络模型,约简后的属性数据进入粒子群优化神经网络的智能决策系统.实证结果表明,该方法具有较好的泛化能力,与标准支持向量机、遗传神经网络等方法相比,该方法具有一定的优势. 相似文献
3.
Unconstrained influence diagrams extend the language of influence diagrams to cope with decision problems in which the order of the decisions is unspecified. Thus, when solving an unconstrained influence diagram, we not only look for an optimal policy for each decision but also for a so‐called step policy specifying the next decision given the observations made so far. However, due to the complexity of the problem, temporal constraints can force the decision maker to act before the solution algorithm has finished and, in particular, before an optimal policy for the first decision has been computed. This paper addresses this problem by proposing an anytime algorithm that at any time provides a qualified recommendation for the first decisions of the problem. The algorithm performs a heuristic‐based search in a decision tree representation of the problem. We provide a framework for analyzing the performance of the algorithm, and experiments based on this framework indicate that the proposed algorithm performs significantly better under time constraints than dynamic programming. 相似文献
4.
《Journal of Parallel and Distributed Computing》1996,37(1):41-54
Programming distributed-memory multiprocessors and networks of workstations requires deciding what can execute concurrently, how processes communicate, and where data is placed. These decisions can be made statically by a programmer or compiler, or they can be made dynamically at run time. Using run-time decisions leads to a simpler interface—because decisions are implicit—and it can lead to better decisions—because more information is available. This paper examines the costs, benefits, and details of making decisions at run time. The starting point is explicit fine-grain parallelism with any number (even thousands) of threads. Five specific techniques are considered: (1) implicitly coarsening the granularity of parallelism, (2) using implicit communication implemented by a distributed shared memory, (3) overlapping computation and communication, (4) adaptively moving threads and data between nodes to minimize communication and balance load, and (5) dynamically remapping data to pages to avoid false sharing. Details are given on the performance of each of these techniques as well as on their overall performance for several scientific applications. 相似文献
5.
Recent developments on multimedia systems and networking technology show that using desktop multimedia conferencing for group decision making on wide area networks such as the Internet is possible. In this paper we review the design, hardware and software requirements and organizational issues in a desktop multimedia conferencing system. We draw on our experiences from multiple multimedia conferences on the Internet and in particular we focus on a case study on urban planning using desktop multimedia conferencing on the Internet. Further we discuss implications for further research on desktop multimedia conferencing. 相似文献
6.
David L. Olson 《Information Systems Frontiers》2001,3(2):239-248
Management information systems serve business organizations by providing information for decision making. Various types of systems serve different types of decision contexts. The philosophic basis of information system support is discussed. The rational (or normative) philosophy is widely used, and appears in business theory in the form of agency theory and transaction cost analysis. While this approach has been valuable in some contexts, there are other contexts where the rational approach has limited in utility for real business decision making. Decision makers need to consider subjective factors to enable them to cope with the high levels of uncertainty, incomplete understanding, and imperfect data typical of dynamic open systems. There are alternative philosophies upon which to base decision-making that are appropriate for specific decision contexts. Churchman identified empirical, multi-perspective frameworks, dialectic, and cause-and-effect inquiring systems as alternatives to the rational (normative) system. A number of information system tools, such as decision support systems, expert systems, and group support systems can be supported by models based on philosophies other than rational models. A more empirically based philosophy, with decision-makers balancing hypothesis generation and observations of performance, is often more appropriate. The relationship between Churchman's inquiring systems and information system types are discussed. 相似文献
7.
A New Generalized Pythagorean Fuzzy Information Aggregation Using Einstein Operations and Its Application to Decision Making 下载免费PDF全文
Harish Garg 《国际智能系统杂志》2016,31(9):886-920
The objective of this article is to extend and present an idea related to weighted aggregated operators from fuzzy to Pythagorean fuzzy sets (PFSs). The main feature of the PFS is to relax the condition that the sum of the degree of membership functions is less than one with the square sum of the degree of membership functions is less than one. Under these environments, aggregator operators, namely, Pythagorean fuzzy Einstein weighted averaging (PFEWA), Pythagorean fuzzy Einstein ordered weighted averaging (PFEOWA), generalized Pythagorean fuzzy Einstein weighted averaging (GPFEWA), and generalized Pythagorean fuzzy Einstein ordered weighted averaging (GPFEOWA), are proposed in this article. Some desirable properties corresponding to it have also been investigated. Furthermore, these operators are applied to decision‐making problems in which experts provide their preferences in the Pythagorean fuzzy environment to show the validity, practicality, and effectiveness of the new approach. Finally, a systematic comparison between the existing work and the proposed work has been given. 相似文献
8.
9.
An Evidential Axiomatic Design Approach for Decision Making Using the Evaluation of Belief Structure Satisfaction to Uncertain Target Values 下载免费PDF全文
Axiomatic design (AD) provides a general theory for system and product development. In recent years, the principles of AD have been successfully applied to the decision‐making field, and derived a fuzzy AD approach for fuzzy decision‐making environment. In this work, the interest is paid on the theoretical developments and applications of AD in the uncertain environment expressed by Dempster–Shafer evidence theory. Based on the concept of belief structure satisfaction to uncertain target values, an evidential AD approach is proposed for decision making by combining the independence axiom and information axiom of AD with the framework of Dempster–Shafer theory. An illustrative example has demonstrated the effectiveness of the proposed approach. This work, on the one hand, has successfully generalized the principles of AD to the Dempster–Shafer uncertain environment; on the other hand, it has presented a successful application of the concept of belief structure satisfaction. 相似文献
10.
Pandian M. Vasant 《Journal of Intelligent Manufacturing》2006,17(1):5-12
This paper presents new methods for solving a production-planning problem. First the modified s-curve membership function
as a methodology is constructed. Then fuzzy production planning problems with vagueness parameters alpha and fuzzy objective
coefficients, fuzzy technical coefficients and fuzzy resource variables are outlined. The objective of this paper is to find
a satisfactory solution for optimal profit in which vagueness is playing major factor in selecting the solution. Finally a
practical application of decision-making in production planning is illustrated. 相似文献
11.
目前在智能领域中对Vague集的研究已越来越广泛与深入,并运用于决策问题中,有学者已把Vague集用于多评价指标的模糊决策中,但其决策方法在某些时候却难以得到目标。为此,本文提出了一个基于Vague集模糊推理的多评价指标模糊决策方法。在这个方法中,从基于Vague集的模糊推理的观点来看待模糊决策问题。将评价指标和候选方案之间的关系用一组基于Vague集的推理规则来表示,将决策者的要求用一组Vague集来表示,经过模糊推理等过程最后得到决策结果。然后还给出了一个实例说明这种多评价指标模糊决策方法。这个基于Vague集模糊推理的多评价指标模糊决策方法的提出为决策系统提供了一个有用的工具。 相似文献
12.
Group Decision Making in Information Systems Security Assessment Using Dual Hesitant Fuzzy Set 下载免费PDF全文
Network information system security has become a global issue since it is related to the economic development and national security. Information system security assessment plays an important role in the development of security solutions. Aiming at this issue, a dual hesitant fuzzy (DHF) group decision‐making (GDM) method was proposed in this paper to assist the assessment of network information system security. A systemic index containing four aspects was established including organization security, management security, technical security, and personnel management security. The DHF group evaluation matrix was constructed based on the individual evaluation information from each expert. Some power average operator–based DHF information aggregation operators are proposed and used to fusion the performance of each criterion for information systems. The advantage of these operators is that they can describe the relationship between the indexes quantitatively. Finally, a case study about information systems security assessment was presented to verify the effectiveness of proposed GDM methods. 相似文献
13.
14.
犹豫模糊集作为定量描述犹豫不决的有效工具,通过同时处理不确定性信息中的犹豫性与模糊性,解决犹豫不决背景下的多属性决策问题.文中针对属性值为犹豫模糊数的多属性决策问题,研究基于模糊图论的相关模型与多属性决策方法.首先,提出犹豫模糊图的概念和部分常见运算规则.然后,构建基于犹豫模糊图的一般性多属性决策方法.最后,通过具体算例和对比性分析验证文中方法的合理性. 相似文献
15.
16.
We combined the case study approach and information technologies to create a multi-media courseware that brought real-world decision making from engineering industry into the classrooms. This paper describes the process of developing the CD-ROM courseware, details of classroom administration, and results of measuring the effectiveness of using the courseware in classes. This courseware was selected as the Premier Courseware of 1998 by NEEDS and John Wiley and Sons through a rigorous application and review process. Evaluation results of the use of the courseware in classrooms show that it enhanced classroom experience of students and helped them understand how decisions were made in the real-world. It also enhanced their higher-level cognitive skills. We expect that widespread use of multi-media courseware build on similar principles could lead to significant changes in the way students are educated. 相似文献
17.
18.
19.
20.
This paper describes a novel and practical Japanese parser that uses decision trees. First, we construct a single decision tree to estimate modification probabilities; how one phrase tends to modify another. Next, we introduce a boosting algorithm in which several decision trees are constructed and then combined for probability estimation. The constructed parsers are evaluated using the EDR Japanese annotated corpus. The single-tree method significantly outperforms the conventional Japanese stochastic methods. Moreover, the boosted version of the parser is shown to have great advantages; (1) a better parsing accuracy than its single-tree counterpart for any amount of training data and (2) no over-fitting to data for various iterations. The presented parser, the first non-English stochastic parser with practical performance, should tighten the coupling between natural language processing and machine learning. 相似文献