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1.
用系统自组织理论分析和论证了系统结构在整体上的非完美性、序的非逻辑性和相对保守性;功能的可变性与目的的非完全一致性、非协调性;信息的不稳定性、可干扰性、可湮灭性;环境的多变性。并对自然巨系统从宇观到基因各具有关节点意义的层次进行了非优的考察。其结论是:非优也是世界上一切系统的普遍存在,认识此点,有利于促进非优向优的转化。  相似文献   

2.
一种模糊偏好的群体决策方法   总被引:6,自引:2,他引:4  
用模糊集观点研究群体决策。首先给出两种具体算法:贴近度法和多数规则法,将专家对方案集的个体模糊偏好判断集结成群体模糊序关系;证明了贴近度法比多数规则法更有实用价值。其次,定义了非优超方案模糊集的概念,在此基础上提出了从群体模糊序关系中确定“获胜方案”的方法;最后,给出了一个实际案例:三峡工程群体模糊决策问题。  相似文献   

3.
用系统自组织理论分析了系统非优的性质 (客观性、多样性 )、特征 (离散性、潜隐性、突发性 )及类型 (恶非优、隐性非优、中性非优、假性非优、变性非优等 )。  相似文献   

4.
研究了一类广义不确定分布参数系统的综合问题,由广义不确定分布参数系统的特点,直接给出了变结构控制的设计方法。设计过程简单,控制易于实现,且给出了实例  相似文献   

5.
独立决定和非二元性选择函数的Arrow不可能性定理   总被引:3,自引:1,他引:2  
研究Arrow不可能性定理的弱化问题,将独立不相关条件(IIA)弱化为独立相关决定条件,证明在非二元性选择函数环境下对IIA弱化后Arrow不可能性定理仍然成立,并将它推广到选择函数不具有连通性的群格序决策问题。所得结论表明导致IIA弱化后,不可能性定理仍然成立的根本原因不是选择函数的连通性。  相似文献   

6.
滞后不确定广义系统的稳定性与变结构控制   总被引:1,自引:0,他引:1  
利用Lyapunov函数方法、变结构控制方法研究滞后广义不确定系统,得到两个主要结果,一是关于一类滞后广义非线性不确定系统的鲁棒性判据,二是对不确定的滞后广义系统利用变结构控制方法给出了鲁棒镇定的充分条件。  相似文献   

7.
对线性和非线性不确定脉冲系统的鲁棒指数稳定性问题进行了研究,利用拟Lyapunov函数法以及Riccati和Hamilton-Jacobi不等式等方法,分别得到了线性和非线性不确定脉冲系统鲁棒指数稳定的充分条件,这些鲁棒指数稳定性判据可用Riccati不等式方程或Hamilton-Jacobi不等式方程是否有正定解检验,最后,给出了一个实例加以验证所得到的结论。  相似文献   

8.
给出一种斜率关联度的计算方法,它的最大优点是不要求变量服从一定的概率分布,将这种方法应用油松生长量的研究,得出了油松树高生长与光照射时数,湿度及降水量相关度最大,胸径和材积的生长量对单个气候因子变化不敏感。  相似文献   

9.
基于D-S证据推理的项目投资综合决策模型与应用   总被引:9,自引:1,他引:9  
针对投资决策系统的不确信因素,阐述提取指标体系不确信度的五种方法;并基于D-S证据推理建立投资项目决策模型,最后以实例作对比研究验证该模型在不确信投资决策系统中应用的有效性和实用性。  相似文献   

10.
在项目收入流不确定的假设下,研究如何寻找最优投资时点问题,建立了问题的最优停止模型,利用高切原理求解一个自由边界问题,得到候选解,运用最优停止理论验证了其的确为最优解,显式地给出最优投资时点并进行了比较静态分析,研究结果修正了传统投资准则,特别包括了传统的Jorgenson投资准则作为其特殊情形,论文的方法不需要完全金融市场和市场无套利的假定。  相似文献   

11.
A concept of system waste has been developed, and reported in the literature, to focus explicitly on waste and its reduction. In this study, which is a part of the authors' ongoing research on system waste, an attempt has been made to estimate current and future system waste in education and research (EDR) in India. The concept of system waste, which is defined as “any unnecessary input to and/or any undesirable output from any system,” is complex, multifaceted, subjective and not generally clearly understood. Its study is a fit case for the use of qualitative group problem-solving techniques. Delphi is the technique which has been used here to learn about system waste. A two-round Delphi study was conducted in 1990 in EDR in which teachers, educational administrators, planners, and parents participated. The paper describes the study and its results.  相似文献   

12.
基于CBR的损伤评估系统研究   总被引:3,自引:0,他引:3  
在基于案例的战场损伤评估研究中,提取了案例属性,进行了案例表示,确定了案例检索机制。在此基础上,描述了基于CBR的评估过程,采用统一建模语言进行了系统分析建模,并用ROSE工具进行描述。在建立了战场损伤评估案例库的基础上,开发了系统原型并进行了分析。分析表明,利用CBR思想来处理损伤评估领域问题是科学可行的,在此原型系统基础上可以开发损伤评估案例系统,实现正确、快速的损伤评估。  相似文献   

13.
综合人工智能优化矿业工程复杂大系统   总被引:5,自引:0,他引:5  
矿业工程是一个涉及多因素、多层次的、动态变化的复杂大系统,在分析人工智能技术在矿业工程中应用基础上,提出综合人工智能技术优化方法,并以矿业工程中的工艺系统及设备选择为例,介绍了它在矿为工程复杂大系统优化中的应用研究成果。  相似文献   

14.
基于遗传算法寻优的PID控制技术及应用   总被引:7,自引:0,他引:7  
以电液比例机械手为研究对象,提出一种基于遗传算法寻优的PID控制算法,并进行了计算机仿真和试验研究.结果表明,根据遗传算法寻优设计的PID控制器具有较强的鲁棒性,即使在外部环境恶劣的条件下,系统的控制性能仍具有较好的动态品质和稳态精度.  相似文献   

15.
全方位轮式移动机器人控制器设计与实现   总被引:1,自引:0,他引:1  
全面介绍了一种全方位移动机器人的控制系统体系结构及软件的控制策略 ,包括采用的超声和激光传感器系统、网络化无线通讯系统、基于上下位机的计算机控制系统等方面。重点介绍了基于LM6 2 8的系统的伺服控制方法 ,并给出了机器人运动实验的结果 ,证明了系统的可行性。该系统适合在非结构化动态环境中进行分布式多Agnet(智能体 )、多机器人的协作与协调、移动机器人路径规划与避碰等研究。  相似文献   

16.
Abstract: Two mathematical models are developed in this paper to study the effectiveness of system administration effortson the improvement of system availability, based on the assumption that there exists a transitional state for a computer sys-tem in operation before it is brought down by some hardware or software problems and with intensified system administra-tion efforts, it is possible to discover and fix the problems in time to bring the system back to normal state before it isdown. Markov chain is used to simulate the transition of system states. A conclusion is made that increasing system admin-istration efforts may be a cost-effective way to meet the requirements for moderate improvement on system availability, buthigher demand on this aspect still has to be met by advanced technologies.  相似文献   

17.
1992-2001年我国灰色系统理论应用研究进展   总被引:21,自引:0,他引:21  
李孜军 《系统工程》2003,21(5):8-12
对1992-2001年国内主要刊物上发表的有关灰色系统理论应用研究方面的论文进行全面检索和统计,并在此基础上系统分析我国灰色系统理论应用研究的进展情况。  相似文献   

18.
解决由人参与的不确定问题情境是当代系统方法论应用研究的主要方向。硬系统方法论采用功能主义整体优化的分析手段来解决目标明确的复杂技术问题,忽视了关于人的价值观和世界观等因素。软系统方法论采用诠释主义的范式来探询和改善问题情境,在处理组织内部关于权力不对等和价值观对立的问题情境时遇到很大挑战。批判系统思想融合了哈贝马斯的三种理性,其中创造性整体论提出了根据不同问题情境采用相适应的系统方法论来解决问题的研究进路。  相似文献   

19.
Electronic medical records (EMR) are generally used by nurses in hospitals. However, studies investigating views on and evaluations of EMR by nurses are limited in Turkey and in other countries around the world. In this study, nurses’ views on EMR systems were investigated in terms of “Nursing care management”, “Order entry”, “Information Management”, “Information quality”, “Service quality”, “Impact of EMR system on clinical care”. The purpose of this study was to investigate the views/perceptions on EMR used by nurses working at hospital clinics in Turkey. The research questions were: (a) What are nurses’ perceptions on EMR? (b) Were there relationships among nurses’ perceptions on EMR? (c) Were there differences among nurses’ perceptions on EMR according to hospitals in Turkey. This study is composed of field research conducted using questionnaires. To prepare the data-measuring instrument, the literature on EMR was reviewed. A Likert scale type was used in this questionnaire. The study was planned and conducted on nurses working at inpatient care units at four Turkish hospitals. At the end of this study, the questionnaire had been conducted on 517 nurses. Total response rate is 66.70 %. We found that the Information quality of EMR, impact of EMR system on clinical care and service quality were high level. Information quality has the highest mean score. EMR system is an important system for nurses’ hospital has the highest mean score in this study. Nurses feel about impact of EMR system on clinical care that generally ‘EMR system’s usefulness’, ‘improving quality of information due to EMR system’, ‘improving quality of nurses’ work’, ‘improving quality of information due to EMR system’. All of the six subscales of EMR were positively correlated with each other. This study revealed that there are significant differences among the mean scores for six subscales according to the ownership of hospitals. EMR systems were not well integrated into their workflow. In addition, half of all respondents had not been trained in using EMR systems. This study will added to evaluation views and assessments of nurses about EMR literature. The results will assist in determining “Information quality”, “Service quality”, of EMR, and “Impact of EMR system on clinical for nurses in Turkish health system”. This survey suggests that nurses favor the use of an EMR and suggests opportunities for EMR enhancement.  相似文献   

20.
基于结构元理论的模糊多服务台排队模型   总被引:1,自引:0,他引:1  
在排队论中,引入模糊数学方法,把实际中的模糊事件用精确的数学表达式表示.同时将结构元理论引入到模糊排队论中,把模型中的模糊参数用结构元表示,使模糊排队论系统特征值的隶属函数得到解析表达.该方法能为管理决策提供更丰富的信息.对阜新大商集团新玛特超市进行实证研究.将模糊随机服务系统与传统随机服务系统研究的结果进行了对比,得到了重要的信息.  相似文献   

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