Discovering Spatio-Temporal Models of the Spread of West Nile Virus

Emerging infectious diseases are characterized by complex interactions among disease agents, vectors, wildlife, humans, and the environment. Since the appearance of West Nile virus (WNV) in New York City in 1999, it has infected over 8,000 people in the United States, resulting in several hundred deaths in 46 contiguous states. The virus is transmitted by mosquitoes and maintained in various bird reservoir hosts. Its unexpected introduction, high morbidity, and rapid spread have left public health agencies facing severe time constraints in a theory-poor environment, dependent largely on observational data collected by independent survey efforts and much uncertainty. Current knowledge may be expressed as a priori constraints on models learned from data. Accordingly, we applied a Bayesian probabilistic relational approach to generate spatially and temporally linked models from heterogeneous data sources. Using data collected from multiple independent sources in Maryland, we discovered the integrated context in which infected birds are plausible indicators for positive mosquito pools and human cases for 2001 and 2002.     

供应商—客户关系与代理成本

关系交易作为中国企业间交易的典型模式,其对代理成本产生的影响尚不明确。以2012—2018年沪深A股上市公司为样本,研究了供应商—客户关系对企业代理成本的影响。研究发现,关系型交易与两类代理成本均呈显著的U型关系。即在关系型交易初期,随着关系型交易的深入,两类代理成本均有所降低;但随着关系型交易深入的程度超过拐点,两类代理成本会上升。进一步研究发现,高管持股会正向调节关系交易与第一类代理成本之间的关系,但对第二类代理成本的调节作用不显著。供应商—客户关系与代理成本之间的关系,为合作双方适度把握关系型交易的深度与频率,最大程度地发挥关系型交易的优势作用提供了经验证据。企业要认识到高管持股对代理成本的影响,充分发挥其对第一类代理成本的抑制作用。     

家族企业的关系治理:一个探索性研究

由于家族企业的特殊性,其治理模式常常包含关系治理和契约治理两种手段,两种治理手段交织形成了弱关系治理弱契约治理、弱关系治理强契约治理、强关系治理弱契约治理、强关系治理强契约治理4种治理模式.环境干扰、资产规模、企业领导价值观以及所有权结构等方面因素影响了企业治理模式的选择,治理模式又直接影响企业的经济绩效.实证研究显示,在强关系治理强契约治理的模式下,家族企业才能取得最好的经济绩效.     

语义网络的关系结构和词义检索模式

语义网络是模拟人脑记忆的知识表征系统,记忆中的概念通过关系结构互相连接,主要有分层结构、主题分类、并列结构、搭配等等.在扩散性语义网络模型中,词义检索始于激活一个概念节点,相关的其他概念继而平行激活,特定方向的激活一定程度上是串行的.语义网络的关系结构影响词义检索.意义关系是主要的语义提示,能缩小潜在的搜索范围,加快识别目标词.     

怀柔县产业结构的灰色关联分析

本文采用灰色关联分析 ,从总体到局部全面分析了怀柔县的产业结构的特点、现状和发展趋势 ,指出其长处和不足 ,并对今后的产业结构调整提出了建议。     

比较文学视阈下的中国各民族文学关系研究

中国各民族文学关系研究是在少数民族文学研究逐渐成熟的过程中发展而成的新兴学科,其跨民族、跨文化、跨语言、跨学科的文学研究的学科特性,决定了其在比较文学研究领域不可或缺的地位。民族文学关系研究是有关双方文学与文化系统的研究,影响关系研究和平行研究是中国民族文学研究的两个重要方面。     

The NEGOPY network analysis program

A method and its associated computer program for (specifically communication) network analysis are described. The program described here, NEGOPY, is relational, or linkage-based. The conceptual orientation, computational algorithm, operating characteristics, format and availability of NEGOPY are described. Finally, a partial bibliography of works describing other aspects of NEGOPY and research studies using NEGOPY is included.     

The Guijin Therapist and the Nature of Therapeutic Truth: A Relational Perspective

The professional literature is replete with examples of the benefits of the client–clinician dyad being of the same ethnic group. Noted advantages include a perceived implicit understanding of the clients subjective experience and a furthering of the therapists personal and professional growth as a result of the therapeutic interaction. This paper suggests that there are also benefits to the clinician being considered a guijin or outsider to the clients culture of origin. Utilizing a relational perspective with an emphasis on multiple self-state theory, this paper will discuss the advantages of being perceived as an outsider when working with an Asian bicultural client.An earlier version of this paper was presented at the Annual International Conference for the Advancement of Private Practice in Clinical Social Work in Lisbon, Portugal on June 8, 2002.     

企业间合作的经济学研究框架

近年来,企业间的各种合作形态一直是企业理论、产业组织理论以及新制度经济学研究的重点。在对传统的市场和企业“两分法”的批评中,人们不断用新的研究范式来弥补两分法的中间地带。但是这些范式有很多混乱、雷同和牵强的地方。以交易成本经济学为基础,在关系性缔约的框架下,研究交易的治理结构以及产业的效率特征,是一个研究企业间联盟、供应链等企业间合作现象的合理框架。