共查询到20条相似文献,搜索用时 31 毫秒
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Brito Claúdia Esteves Marisa Peixoto Hugo Abelha António Machado José 《Wireless Networks》2022,28(3):1269-1277
Wireless Networks - Continuous ambulatory peritoneal dialysis (CAPD) is a treatment used by patients in the end-stage of chronic kidney diseases. Those patients need to be monitored using blood... 相似文献
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Economou G.-P. Lymberopoulos D. Karavatselou E. Chassomeris C. 《IEEE transactions on information technology in biomedicine》2001,5(1):55-65
The original concept that led to the structuring of a computer-based medical decision support system (DSS) that is able to support a physician's diagnosis is introduced in this paper. The concept's implementation modeled a generic DSS, the core of which are an integrated knowledge/information base (KIB) along with the inference properties of a data evaluator. The KIB encapsulates the necessary medical knowledge and experience in the form of rules and constraints, preemptive tasks and actual patients' clinical data. The data evaluator handles approved medical subjective and objective criteria for assessing the KIB's data. The data evaluator incorporates a medical standard data gathering and decision process, structured upon the principles of the clinical differential diagnosis methodology, and has been integrated in the system by means of both algorithmic and artificial intelligence techniques. The novel model and the resulted computer-based package have been extensively tested at the Pulmonary Department of the University Regional Hospital Patras, Greece 相似文献
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关于粗糙集属性约简的进化算法研究和应用 总被引:11,自引:6,他引:5
粗糙集理论是一种新的处理模糊和不确定知识的数学工具.属性约简是粗糙集理论研究中的重要内容之一。本文提出了用其构建科学、合理、简洁有效的科研项目评审指标体系,为科研智能管理提供新的解决方法。本文中提出一种基于进化算法的知识相对约简算法。通过在知识表达系统中引入决策属性支持度的概念.来描述由条件属性所提供的知识对整体决策的支持程度.并通过决策属性支持度定义条件属性对决策属性的相对重要性。以此作为启发式信息求出相对核。并将相对核加入进化算法的初始种群中以加快算法的收敛。同时.在适应值函数中引入惩罚函数。可以保证所求约筒既含较少的属性又有较强的支持度,能够获得最佳的搜索效果。 相似文献
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Test programs are conducted to identify system failure modes and to estimate reliability. If the system can be changed so that some of the identified failure modes are eliminated and new failure modes are not introduced, the reliability of the system is improved. This paper examines small-sample techniques for estimating the change in reliability without the benefit of test data from the improved system. A decision to make the improvements can be based on the estimated increase in reliability. The procedures used for estimating changes can also be adapted to estimating reliability using data from a test program conducted in stages. For this case, a sample is taken at each stage and changes are made so that all newly identified failure modes which are correctable are eliminated from the system. Simulation is used to study reliability estimators both when just one sample is taken and when sampling is conducted in stages. 相似文献
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TANABU Motonari 《中国电子科技》2004,2(3)
Business game can be used not only as an educational tool for the development of decision making ability, but also can be used for supporting the knowledge creation activity in organizations. In this paper, some conceptual considerations to meanings of the business game in the knowledge creation activity by using the knowledge creation theory and other related theories are given, and business game activity concept which refers to game play and development is proposed. Then focusing on the business game activity as an instantiation of the knowledge creation activity, and a Web based gaming activity support system based on the former system called YBG that enables us to play and develop many business games through the standard web browser is proposed. This system also provides us a lot of opportunities to play and develop the business games over business game communities. 相似文献
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Islei G. Lockett G. Cox B. Stratford M. 《Engineering Management, IEEE Transactions on》1991,38(3):202-209
The development of a computerized decision support system for R&D project ranking, monitoring and control in the pharmaceutical industry is described. Using a series of techniques based on a judgmental modeling approach, an overall system has been developed that covers several different aspects of the whole decision making process. Illustrative examples are given to show how the components of the model are used in practice, indicating their place in the overall management process. The results provide evidence supporting the value of such models which help reduce ambiguity by using structured approaches 相似文献
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Dempere-Marco L Hu XP MacDonald SL Ellis SM Hansell DM Yang GZ 《IEEE transactions on medical imaging》2002,21(7):741-754
This paper presents a new method of knowledge gathering for decision support in image understanding based on information extracted from the dynamics of saccadic eye movements. The framework involves the construction of a generic image feature extraction library, from which the feature extractors that are most relevant to the visual assessment by domain experts are determined automatically through factor analysis. The dynamics of the visual search are analyzed by using the Markov model for providing training information to novices on how and where to look for image features. The validity of the framework has been evaluated in a clinical scenario whereby the pulmonary vascular distribution on Computed Tomography images was assessed by experienced radiologists as a potential indicator of heart failure. The performance of the system has been demonstrated by training four novices to follow the visual assessment behavior of two experienced observers. In all cases, the accuracy of the students improved from near random decision making (33%) to accuracies ranging from 50% to 68%. 相似文献
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Simple triplication is widely analyzed either as a static redundancy by itself or as an active core for dynamic redundancy. Its practical value was tested when it was used to protect the hardcore test and repair processor (TARP) of JPL STAR computer and the CPU of Guidance Computer for SATURN V. Two current techniques for using triplicated modules are TMR and TMR/Simplex. In this paper a set of dynamic decision techniques is proposed for better use of triplication, assuming Pr {system is in a specified failure mode | system has failed} is known for all failure modes of concern. 相似文献
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Obtaining a good maintenance strategy for a standby system is discussed. The problem is analyzed via decision theory to determine the waiting time to call the repair facility (for a two-unit standby system) when the first piece of equipment fails. Previous research into this kind of system is briefly described, and a need for constructing a decision model is explained. The uncertainty of the parameters is accounted for in a Bayes approach in order to consider expert prior knowledge. The failure and repair rates are assumed to be constant and are elicited from an expert's prior beliefs. When no data are available, expert guesses are used. A method is presented for solving the conflicting requirements of system availability and cost through a multiattribute utility function which can express cardinal values for the decision maker's preferences over the objective variables. The decision model derives the appropriate maintenance strategy; it corresponds to a set of actions, procedures, and resources, giving a consequent waiting time before calling the repair facility. The use of the model is demonstrated for a telecommunication system 相似文献
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A strong motivation for reliability analyses is to support decision-making relative to the construction and operation of systems involving an economic/environmental risk. The Bayes approach to making decisions in face of uncertainty about mission survival is presented step by step. The authors show how the decision maker defines his own predictive probability distribution on the system time to failure and ranks the couples [decision taken, observed value of system failure time] by means of a loss function. They also introduce the minimum-expected-loss principle as a leading criterion for decision making. Finally, they address the more general case in which the final decision can be delayed in favor of collecting more information and derive the optimal termination procedure for life testing. For selecting the best course of action in a Bayes reliability frame there is neither need nor room for estimation of probability distribution parameters 相似文献
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飞机战伤评估与修理决策支持系统研究 总被引:2,自引:0,他引:2
研究和探讨了建立飞机战伤评估与修理决策支持系统的可行性、有益性,以及飞机战伤评估与修理决策支持系统的总体结构和功能,知识表示方法,推理机制和过程等方面的问题。 相似文献
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Stephen M. Corey member of the Artificial Intelligence Group Richard S. Carnahan Jr member of the Artificial Intelligence Group 《Telematics and Informatics》1990,7(3-4):379-402
Work reported in this paper is part of a continuing effort to apply rapid prototyping and Artificial Intelligence techniques to problems associated with projected Space Station-era information management systems. In particular, timely updating of the various databases and knowledge structures within our proposed intelligent information management system (IIMS) is critical to support decision making processes. Because of the significantly large amounts of data entering the IIMS on a daily basis, information updates will need to be automatically performed with some systems requiring that data be incorporated and made available to users within a few hours. Meeting these demands depends first, on the design and implementation of information structures that are easily modified and expanded, and second, on the incorporation of intelligent automated update techniques that will allow meaningful information relationships to be established. This paper examines potential techniques for developing such an automated update capability and examines IIMS update requirements in light of results obtained from our IIMS prototyping effort. 相似文献
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Based on the enhanced segmentation of suspicious mass areas, further development of computer-assisted mass detection may be decomposed into three distinctive machine learning tasks: 1) construction of the featured knowledge database; 2) mapping of the classified and/or unclassified data points in the database; and 3) development of an intelligent user interface. A decision support system may then be constructed as a complementary machine observer that should enhance the radiologists performance in mass detection. We adopt a mathematical feature extraction procedure to construct the featured knowledge database from all the suspicious mass sites localized by the enhanced segmentation. The optimal mapping of the data points is then obtained by learning the generalized normal mixtures and decision boundaries, where a is developed to carry out both soft and hard clustering. A visual explanation of the decision making is further invented as a decision support, based on an interactive visualization hierarchy through the probabilistic principal component projections of the knowledge database and the localized optimal displays of the retrieved raw data. A prototype system is developed and pilot tested to demonstrate the applicability of this framework to mammographic mass detection. 相似文献
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Jingguo Wang Sharman R. Ramesh R. 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2008,38(1):110-124
Replication is one of the primary techniques used to improve the quality of distributed content service. It generally reduces user latencies and increases a site's availability. However, to our knowledge, there is no systematic framework that combines the structure of both content and service components of a Web application to design effective replica hosting architectures. Recent advances in interconnected and multiple content distribution network (CDN) architectures render this problem even more complex. In this study, we develop a systematic framework for designing and evaluating large-scale, component-based replication architectures for Web systems that are driven by both the quality and effectiveness of service provisioning on the service network. The proposed framework employs a combination of problem decomposition, configuration evaluation through controlled system simulations, and a neural-network-based feedback learning mechanism in the exploration of the design space. A case study demonstrates the viability of the framework. The framework can be an effective decision support tool for a system designer to systematically explore design options and select an appropriate design configuration that best meets the desired design objectives. 相似文献
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《IEEE transactions on information technology in biomedicine》2008,12(5):678-686
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Pattern discovery: a data driven approach to decision support 总被引:1,自引:0,他引:1
A.K.C. Wong Yang Wang 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2003,33(1):114-124
Decision support nowadays is more and more targeted to large scale complicated systems and domains. The success of a decision support system relies mainly on its capability of processing large amounts of data and efficiently extracting useful knowledge from the data, especially knowledge which is previously unknown to the decision makers. With a large scale system, traditional knowledge acquisition models become inefficient and/or more biased, due to the subjectivity of the experts or the pre-assumptions of certain ideas or algorithmic procedures. Today, with the rapid development of computer technologies, the capability of collecting data has been greatly advanced. Data becomes the most valuable resource for an organization. We present a fundamental framework toward intelligent decision support by analyzing a large amount of mixed-mode data (data with a mixture of continuous and categorical values) in order to bridge the subjectivity and objectivity of a decision support process. By considering significant associations of artifacts (events) inherent in the data as patterns, we define patterns as statistically significant associations among feature values represented by joint events or hypercells in the feature space. We then present an algorithm which automatically discovers statistically significant hypercells (patterns) based on: 1) a residual analysis, which tests the significance of the deviation when the occurrence of a hypercell differs from its expectation, and 2) an optimization formulation to enable recursive discovery. By discovering patterns from data sets based on such an objective measure, the nature of the problem domain will be revealed. The patterns can then be applied to solve specific problems as being interpreted or inferred with. 相似文献