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排序方式: 共有2196条查询结果,搜索用时 15 毫秒
1.
文章透析了监理单位的外部管理现状 ,内部运行机制及监理业务的竞争环境 ,并提出了相应的对策与建议 相似文献
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Estimated associations between an outcome variable and misclassified covariates tend to be biased when the methods of estimation that ignore the classification error are applied. Available methods to account for misclassification often require the use of a validation sample (i.e. a gold standard). In practice, however, such a gold standard may be unavailable or impractical. We propose a Bayesian approach to adjust for misclassification in a binary covariate in the random effect logistic model when a gold standard is not available. This Markov Chain Monte Carlo (MCMC) approach uses two imperfect measures of a dichotomous exposure under the assumptions of conditional independence and non-differential misclassification. A simulated numerical example and a real clinical example are given to illustrate the proposed approach. Our results suggest that the estimated log odds of inpatient care and the corresponding standard deviation are much larger in our proposed method compared with the models ignoring misclassification. Ignoring misclassification produces downwardly biased estimates and underestimate uncertainty. 相似文献
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任常茂 《长江大学学报(社会科学版)》1996,(5)
利用上下解,Brouwer不动点原理及Lyapunov泛函方法,讨论了一类具有反馈控制的Logistic扩散系统的周期解问题;获得了周期解存在且稳定的判别条件. 相似文献
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In this paper we develop a study on several types of parallel genetic algorithms (PGAs). Our motivation is to bring some uniformity to the proposal, comparison, and knowledge exchange among the traditionally opposite kinds of serial and parallel GAs. We comparatively analyze the properties of steady-state, generational, and cellular genetic algorithms. Afterwards, this study is extended to consider a distributed model consisting in a ring of GA islands. The analyzed features are the time complexity, selection pressure, schema processing rates, efficacy in finding an optimum, efficiency, speedup, and resistance to scalability. Besides that, we briefly discuss how the migration policy affects the search. Also, some of the search properties of cellular GAs are investigated. The selected benchmark is a representative subset of problems containing real world difficulties. We often conclude that parallel GAs are numerically better and faster than equivalent sequential GAs. Our aim is to shed some light on the advantages and drawbacks of various sequential and parallel GAs to help researchers using them in the very diverse application fields of the evolutionary computation. 相似文献
7.
周仁勇 《合肥工业大学学报(社会科学版)》2002,16(2):131-133
文章通过分析运动员身体能量和心理能量的关系 ,认为主客观都要求运动员赛前将心理能量和身体能量调控到相对较高点 ,以发挥其最大的竞争力。由于心理技能的训练和发展有赖于各心理技能间的相互发展 ,因此 ,对运动员必须从心理能量有效调控关联的技能训练着手进行心理技能训练 相似文献
8.
小议"类词缀"的判别标准 总被引:5,自引:0,他引:5
任志萍 《新疆石油教育学院学报》2002,6(2):48-50
本文主要讨论类词缀的判别标准和类词缀“意义虚化”的内涵 ,认为只有“意义虚化”才是类词缀与词根的区别性特征 ,而类词缀“意义的虚化”主要有“类化”和“泛化”两个表征。定位性、变性功能以及能产性是类词缀的重要特征 ,但不能单独地把它们作为判定标准 ,尤其是能产性不能作为判定标准 相似文献
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高校学生思想政治工作进公寓初探 总被引:1,自引:0,他引:1
高校完全学分制与高校后勤社会化改革的逐步实施,使学生公寓正日渐取代班级而上升为学生生活、学习、思想、情感交流的基本空间及日常教育管理的基本载体。唯有树立依法管理、学生是消费者、师生平等交往的观念,建立由学生考核、实行责任联带追究的高素质管理队伍,以交流、对话、感染的基本方式营造民主和谐的教育管理氛围,探索以辅导员进驻学生公寓为主体的一系列工作新机制,坚持服务意识,强化设施建设,才能真正使公寓成为学生全面发展、成长成才的有效载体。 相似文献
10.
Recently, we developed a GIS-Integrated Integral Risk Index (IRI) to assess human health risks in areas with presence of environmental pollutants. Contaminants were previously ranked by applying a self-organizing map (SOM) to their characteristics of persistence, bioaccumulation, and toxicity in order to obtain the Hazard Index (HI). In the present study, the original IRI was substantially improved by allowing the entrance of probabilistic data. A neuroprobabilistic HI was developed by combining SOM and Monte Carlo analysis. In general terms, the deterministic and probabilistic HIs followed a similar pattern: polychlorinated biphenyls (PCBs) and light polycyclic aromatic hydrocarbons (PAHs) were the pollutants showing the highest and lowest values of HI, respectively. However, the bioaccumulation value of heavy metals notably increased after considering a probability density function to explain the bioaccumulation factor. To check its applicability, a case study was investigated. The probabilistic integral risk was calculated in the chemical/petrochemical industrial area of Tarragona (Catalonia, Spain), where an environmental program has been carried out since 2002. The risk change between 2002 and 2005 was evaluated on the basis of probabilistic data of the levels of various pollutants in soils. The results indicated that the risk of the chemicals under study did not follow a homogeneous tendency. However, the current levels of pollution do not mean a relevant source of health risks for the local population. Moreover, the neuroprobabilistic HI seems to be an adequate tool to be taken into account in risk assessment processes. 相似文献