基于心智模型的恐怖主义袭击扩展式演化博弈分析

政府反恐措施与恐怖分子袭击手段存在着相互观察、适应性演化的过程。本文首先构建了政府作为先行动者、恐怖分子作为后行动者的斯塔克伯格博弈模型,进一步建立了恐怖袭击问题的扩展式演化博弈模型。由于扩展式演化博弈的均衡分析需要考虑代际内和代际间不同层次的信念学习,造成了演化分析的复杂性。本文将"心智模型"概念引入到演化博弈,采取了心智模型演化解的分析方法,得出了简化后的演化均衡解。最后,结合新疆墨玉县6.28暴恐事件进行算例分析,比较怀特流形演化解和心智模型演化解的差异。心智模型演化解的结果表明,根据恐怖分子群体中选择袭击比例是否高于临界值,政府策略收敛到防御或者不防御。该求解方法通过将普遍接受的社会规范引入到演化过程分析,不仅简化了怀特流形的分析过程,而且均衡解展示了更为丰富的、更为切合实际管理问题的演化特征。     

The embeddedness of organizational performance: Multiple Membership Multiple Classification Models for the analysis of multilevel networks

We present a Multiple Membership Multiple Classification (MMMC) model for analysing variation in the performance of organizational sub-units embedded in a multilevel network. The model postulates that the performance of organizational sub-units varies across network levels defined in terms of: (i) direct relations between organizational sub-units; (ii) relations between organizations containing the sub-units, and (iii) cross-level relations between sub-units and organizations. We demonstrate the empirical merits of the model in an analysis of inter-hospital patient mobility within a regional community of health care organizations. In the empirical case study we develop, organizational sub-units are departments of emergency medicine (EDs) located within hospitals (organizations). Networks within and across levels are delineated in terms of patient transfer relations between EDs (lower-level, emergency transfers), hospitals (higher-level, elective transfers), and between EDs and hospitals (cross-level, non-emergency transfers). Our main analytical objective is to examine the association of these interdependent and partially nested levels of action with variation in waiting time among EDs – one of the most commonly adopted and accepted measures of ED performance. We find evidence that variation in ED waiting time is associated with various components of the multilevel network in which the EDs are embedded. Before allowing for various characteristics of EDs and the hospitals in which they are located, we find, for the null models, that most of the network variation is at the hospital level. After adding these characteristics to the model, we find that hospital capacity and ED uncertainty are significantly associated with ED waiting time. We also find that the overall variation in ED waiting time is reduced to less than a half of its estimated value from the null models, and that a greater share of the residual network variation for these models is at the ED level and cross level, rather than the hospital level. This suggests that the covariates explain some of the network variation, and shift the relative share of residual variation away from hospital networks. We discuss further extensions to the model for more general analyses of multilevel network dependencies in variables of interest for the lower level nodes of these social structures.     

The Contingent-Claims Approach to Investment Decisions*

This paper presents a contingent-claims approach to project valuation when capital expenditures are made sequentially over time. It focuses on an important facet of sequential investment projects that the firm can undertake—or pass up projects—as more information becomes available. The contingent-claims approach takes account of this important feature of firms' investment decision process, whereas the traditional capital budgeting procedure does not. Since the traditional method does not reflect the options nature of investment opportunities, it underestimates the value of sequential investment projects. As a result, a naive implementation of the traditional capital budgeting procedure could result in rejecting profitable projects. The extent of undervaluation associated with the traditional capital budgeting procedure is greater when the correlation between the random component of the future asset value and that of the required capital expenditure is smaller and/or when the growth rate of the required capital expenditure is higher.     

丹麦劳动力市场模式分析

丹麦劳动力市场模式是近年来国际劳动力市场模式中非常成功的一种模式,日益受到国际社会的关注。“丹麦模式”的基本特征是将灵活化的劳动力市场、慷慨的福利制度与积极的劳动力市场政策有机结合在一起构成了一个“金三角”,成功地平衡了劳动力市场的灵活性与安全性。丹麦劳动力市场模式以其传统的价值理念、良好的社会合作机制和混合经济体制为基础。随着全球化时代社会经济条件的变化,丹麦劳动力市场模式也面临着严峻的挑战。     

对现代苏南模式转型发展的思考

"十二五"时期,是江苏全面建成小康社会并向率先基本实现现代化迈进的关键时期,苏南地区更是要走在江苏的前列,争取早日实现现代化。苏南经济社会的又好又快发展与在实践中走出来的苏南模式是息息相关的。在国内外经济形势变化的情况下,现代苏南模式要继承苏南模式的核心价值,把握好转型发展、创新发展和开放发展的内涵,积极发展民营经济,加快发展传统文化产业,增强模式的内生动力,助力江苏早日实现现代化。     

西方儿童虐待成因的发展生态模型理论研究述评

发展生态模型是西方儿童虐待成因研究的重要理论框架,但国内对此缺少系统性介绍。该理论认为,儿童虐待产生自互动个体与嵌套生态系统层面间的交互影响,它主要以生态系统理论为理论基础,并以“生态整合模型”和“生态交互模型”为代表性理论模型。该理论具有重要的方法论意义,它可促使研究者突破单因素变量研究的窠臼,并转向多因素共构视角去理解儿童虐待成因;同时,也为儿童虐待治理实践提供了多因素和多层次的系统干预视角。该理论的出现丰富了儿童虐待研究者的理论想象力,可为我国家庭、学校等场域的儿童虐待和儿童保护研究和干预提供启示。     

On the use of quasi-likelihood for estimation in hidden-Markov random fields

This paper illustrates the use of quasi-likelihood methods of inference for hidden Markov random fields. These are simple to use and can be employed under circumstances where only the model form and its covariance structure are specified. In particular they can be used to derive the same estimating equations as the E-M algorithm or change of measure methods, which make full distributional assumptions.     

城镇企业职工基本养老保险基金支付能力预测研究

随着人口老龄化进程的加剧。我国城镇企业职工基本养老保险基金收支出现了巨大缺口并呈现逐步扩大的趋势,导致基金支付能力持续下降。本文应用社会保障精算方法与技术,以社会养老保险现行政策为导向。引入2005年颁布的《国务院关于完善企业职工基本养老保险制度的决定》中新养老金计发办法的经济参数。构建城镇企业职工基本养老保险基金收入与基金支出测算模型,其中以2006年新政策实施年为时间界限。分别构建“老人”、2006年前退休的“中人”（“老中人”）、2006年后退休的“中人”（“新中人”）、“新人”四类群体的基本养老保险基金支出洲算模型。从而推导出城镇企业职工基本养老保险基金支付能力预测精算模型。以期对养老保险基金失衡风险和支竹能力危机进行及时预测。并为社会养老保险政策调整和制度完善提供量化依据。     

水电工程移民收入测算模型构建及其应用研究

移民安置的目标已不再仅仅是按照水库蓄水的要求如期将淹没区居民和有关企、事业单位迁出库区,而且还要特别关注移民生产生活水平的恢复与提高。本文在构建水电工程移民收入测算理论模型以及第一手调查数据资料的基础上,建立符合实际经济社会发展状况的西南地区水电工程移民收入的测算模型,研究成果可以在西南地区水电工程移民收入的测算中推广。收入测算的结果也可以为移民政策的调整、改革及完善提供依据。     

黑河流域人口承载力预测分析

人口承载力的研究对象是由若干个内部关系错综复杂、相互之间联系紧密的子系统所组成的“自然-经济-社会”复合巨系统,本文运用系统动力学建立复合模型仿真模拟预测黑河流域人口承载力状况．并建立黑河流域人口承载力的预警指标体系。复合模型预测数据显示,黑河流域人口承载力呈超载状态．而预警目标值Z=0．979〈1,说明该区没有实现持续发展,乃“磊、乙三个指标小于1,说明黑河流域生态环境和固定资产投资占比是影响黑河流域发展的主要因素。