非经营性政府投资项目特许经营期决策动态博弈模型

在非经营性政府投资项目中引入特许经营可有效地实现项目投资主体多元化,从而解决项目资金短缺、投资主体缺位以及项目激励和约束机制失效等问题。通过构建无现金收益的非经营性政府投资项目实施过程中政府与项目公司之间的动态博弈模型,深入剖析了特许权期与项目公司建设成本、补偿费用等因素之间的相互影响,从而得出项目特许权期的决策方案,确定项目建设成本与补偿费用。算例分析结果表明非经营性政府投资项目的补偿费用对项目公司具有一定的激励效用。     

自动生产线的同步维修模型及实例研究

自动生产线故障停机时间长、停机费用高,其原因在于:设备种类多且相关联,存在各设备协同维修的难题。首先,寻求生产线故障时间和检查时间之间的平衡点,建立检查周期与总停机时间之间关系的目标函数。其次,借鉴同步维修的"对故障隐患集中式批处理,减少分散维修的停机时间"思想,以及时间延迟维修理论,建立生产线的同步维修模型,该模型利用生产线每天停机次数、每次停机时间及检查时发现的缺陷数,计算出合理的生产线检查周期,并以此为依据制定维修计划,实现"提高维修批量,减少生产线停机时间"的目标。最后,实例研究。收集某生产线近十年的故障记录数据,在分析生产流程、设备布局、各设备停机影响的基础上,提出对策指导生产线维修管理。     

基于供应链金融的随机需求条件下的订货策略

本文将供应链金融中的融资问题融入到允许延迟支付的报童模型中,同时考虑了订货商的销售情况对偿还能力的影响,融资利息、销售收入利息以及支付信用期等现金管理要素,建立起订货商在连续随机需求条件下的库存管理模型,通过对模型的求解与灵敏度分析,对供应链金融模式下订货商的订货策略进行了深入探讨,得出了一系列有益的结论。所建立的模型同时为中小销售型企业提供一种新的资金获取以及确定订货策略的方法。     

Information Technology Project Escalation: A Process Model*

Information technology (IT) a common and costly problem. While much is known about the factors that promote escalation behavior, little is known about the actual escalation process. This article uses an in‐depth case study to construct a process model of escalation, consisting of three phases: drift, unsuccessful incremental adaptation, and rationalized continuation. Each phase encompasses several within‐phase escalation catalysts and the model also identifies triggering conditions that promote transition from one phase to the next: project framing (antecedent condition), problem emergence, increased problem visibility, and imminent threat to project continuation (triggering the outcome deescalation). The results show that escalation is not necessarily the result of collective belief in the infallibility of a project. Rather, escalation results from continued unsuccessful coping with problems that arise during a project. Furthermore, the results suggest that the seeds of escalation are sown early: the very manner in which a project is framed contributes to whether or not the project will become prone to escalation. As problems ensue, repeated mismatches between attempted remedies and underlying problems contribute to fueling the escalation process. Implications for research and practice are discussed.     

Identifying Social Interactions Through Conditional Variance Restrictions

This paper proposes a new method for identifying social interactions using conditional variance restrictions. The method provides a consistent estimate of the social multiplier when social interactions take the “linear‐in‐means” form (Manski (1993)). When social interactions are not of the linear‐in‐means form, the estimator, under certain conditions, continues to form the basis of a consistent test of the no social interactions null with correct large sample size. The methods are illustrated using data from the Tennessee class size reduction experiment Project STAR. The application suggests that differences in peer group quality were an important source of individual‐level variation in the academic achievement of Project STAR kindergarten students.     

Motivations for self-assembling into project teams

This study investigates the self-assembly mechanisms of ad hoc project teams using a bipartite network perspective. Individuals and projects are modeled as two types of nodes and team membership as relations between them. This approach enables us to investigate factors that impact voluntary team assembly at the individual, dyadic, and team levels simultaneously. Using Exponential Random Graph Models (ERGM/p*), we study players’ combat teams in a Massively Multiplayer Online Role-Playing Game (MMORPG) as a case of self-assembled project teams. Empirical results show that individuals are motivated to join ad hoc teams to complete difficult projects but not projects with long durations. We also found that individuals tend to collaborate with specific teammates who have complementary skills, those who have similar age or skill level, and those who are affiliated with the same organizational entity.     

Improving body image and sexual health behaviors among college women

ABSTRACT

Objective: To conduct a pilot test to determine if the Body Project, an eating disorder prevention program, was able to reduce risky sexual behaviors. Participants: Twenty college-age women ages 18–21 (in March, 2015) who endorsed both body image dissatisfaction and previous or current sexual activity. Methods: Participants were randomized to the Body Project or psychoeducational control group, and completed baseline, post-test, and 6-month follow-up measures assessing body image concerns, eating behaviors, and sexual behaviors and attitudes. Results: An intervention manipulation check demonstrated that body image variables were in expected directions, though were not significant by group. There was a significant interaction across group and time for “unanticipated sexual encounters,” which decreased in the Body Project group. Conclusions: This pilot study supports the feasibility of using an eating disorder prevention program to reduce other risky behaviors, specifically risky sexual behaviors.     

项目教学法在高职《计算机辅助设计》课程中的应用

项目教学法是近年来高职教学中运用的新型教学法,它能为学生提供实践环境,又能让学生获得知识掌握技能。利用＂项目＂形式进行教学,对于高职院校培养复合型人才具有极为重要的意义。在教学中实现了师生角色的互换,还创设了新颖的学习环境。以高职建筑装饰专业为例,计算机辅助设计课程,实质上就是让学生自主掌握利用的软件AutoCAD、3DS max、photoshop等绘制出建筑装饰需要的图纸。     

Many Faces of Openness in Adoption: Perspectives of Adopted Adolescents and Their Parents

Parents and adolescents (mean age, 15.7 years) from 177 adoptive families participating in the second wave of the Minnesota/Texas Adoption Research Project were interviewed about their post-adoption contact arrangements. The sample included families with no contact, stopped contact, contact without meetings, and contact with face-to-face meetings between the adolescent and birth mother. Openness arrangements were dynamic, and different openness arrangements were associated with different experiences and feelings. Adoptive families with contact reported having higher levels of satisfaction about their openness arrangements, experiencing more positive feelings about the birth mother, and possessing more factual and personal knowledge about the birth mother than did families without contact. Adolescents and adoptive mothers in the contact with meetings group reported the greatest satisfaction with their openness arrangements; those with no contact or stopped contact reported the least satisfaction with their arrangements. Participants having no contact were more likely to want the intensity of contact to increase in the future rather than stay the same. Many participants already having contact wanted it to increase in the future. Fewer than 1 percent of all participants wanted to see the intensity of contact decrease.     

Cyber Counselling: An Innovative Field Education Pilot Project

With the ascendancy of the cyber world, client demand for online counselling has increased and is expected to continue to increase dramatically in the coming years. The purpose of this article is to describe an innovative pilot practicum project in which social work graduate interns offered cyber counselling within a university to undergraduate students. In this paper, we describe the key elements of this project, including those that are unique and those that follow typical practicum processes, along with the challenges identified. Implications for practice and social work education are offered.