Sexual self control as a mediator of high risk sexual behavior in a New York city cohort of HIV+ and HIV‐ gay men

This paper describes the development of the Perceived Sexual Control inventory (PSC) and a study investigating the relationship between an individual's perception of control over sexual behavior and actual sexual risk behavior in a New York City cohort of 108 HIV+ and 48 HIV‐ gay men. Correlational analysis indicated that reported difficulty controlling sexual behavior was associated with having more male sex partners and sex occasions over lifetime and in the 6 months prior to interview, with a greater number of one‐time partners and out‐of‐home partners, with less monogamy, and with being abstinent in the prior 6 months. Those who perceived difficulty with sexual control were significantly more likely to use cocaine or amyl nitrate (poppers) during sex, to do so on more occasions and to use more drugs overall. Additionally, perceptions of sexual control were found to relate to high risk sexual practices. Those lower in perceived sexual control reported more occasions of receiving anal ejaculation than those who reported greater sexual control. Two subscales (Perceived Control Over Sex Drive and Perceived Control Over Risk Behavior), derived via factor analysis from the 20‐item inventory used to assess perceived sexual control, were also examined in relation to the above variables, and differential findings are discussed. The overall pattern of findings supports the construct validity of the PSC.     

Testing the Economic Independence Hypothesis: The Effect of an Exogenous Increase in Child Support on Subsequent Marriage and Cohabitation

We examine the effects of an increase in income on the cohabitation and marriage of single mothers. Using data from an experiment that resulted in randomly assigned differences in child support receipt for welfare-receiving single mothers, we find that exogenous income increases (as a result of receiving all child support that was paid) are associated with significantly lower cohabitation rates between mothers and men who are not the fathers of their child(ren). Overall, these results support the hypothesis that additional income increases disadvantaged women’s economic independence by reducing the need to be in the least stable type of partnerships. Our results also show the potential importance of distinguishing between biological and social fathers.     

三螺旋模式与知识经济

大学、产业与政府三者之间关系构成了一个三螺旋模型，可将此关系网络的新体制模型推广为三种选择环境如何相互作用的新进化模型。两种相互作用的选择机制能形成一个轨道，而三个选择环境则有望生成一种管理制度。通过新进化模型既可理解大学、产业与政府三者间关系的机构整合，又可理解财富创造、知识生产和立法等功能的不同。对于国家、部门和区域创新系统的说明便可以确切地阐述为一个实证问题：协同是否由关系网络的不同功能而产生？由此，该三螺旋模型使我们能在全球层次上，根据局部稳定（和潜在锁定）轨道之间的权衡，对比技术经济制度，研究某种经济的知识基础。     

Clean and green organizing in urban neighborhoods: Measuring perceived and objective outcomes

ABSTRACT

One way in which urban community organizations attempt to improve neighborhood health is through cleaning and greening efforts. Few studies have evaluated how such efforts are related to changes in both residents’ perceptions of neighborhoods and objective community-wide cleaning and greening indicators over time. Drawing upon quantitative and qualitative data collected during an evaluation of a community-building initiative in two communities, results show how neighborhood changes in cleaning and greening were reflected in perceived and objective measures and how these measures compare across different time periods and sub-groups of residents within the two target communities. We provide suggestions for additional ways that future evaluations of urban cleaning and greening efforts can examine the impact.     

Social Welfare and Urban Problems

Financing Higher Education: Recommendations of the Carnegie Commission on Higher Education. Four volumes (see below). Berkeley, California, Carnegie Commission on Higher Education, 1968.

The Economics of the Major Private Universities, William G. Bowen. 66 pages. $1.25 softbound.

The Finance of Higher Education, Howard R. Bowen. $1.00 softbound.

Alternative Methods of Federal Funding for Higher Education, Ronald A. Wolk. 261 pages. $2.00 softbound.

Quality and Equality: New Levels of Federal Responsibility for Higher Education. A Special Report and Recommendations by the Commission. 54 pages. $1.00 softbound.     

Predicting treatment efficacy via quantitative magnetic resonance imaging: a Bayesian joint model

The prognosis for patients with high grade gliomas is poor, with a median survival of 1 year. Treatment efficacy assessment is typically unavailable until 5-6 months post diagnosis. Investigators hypothesize that quantitative magnetic resonance imaging can assess treatment efficacy 3 weeks after therapy starts, thereby allowing salvage treatments to begin earlier. The purpose of this work is to build a predictive model of treatment efficacy by using quantitative magnetic resonance imaging data and to assess its performance. The outcome is 1-year survival status. We propose a joint, two-stage Bayesian model. In stage I, we smooth the image data with a multivariate spatiotemporal pairwise difference prior. We propose four summary statistics that are functionals of posterior parameters from the first-stage model. In stage II, these statistics enter a generalized non-linear model as predictors of survival status. We use the probit link and a multivariate adaptive regression spline basis. Gibbs sampling and reversible jump Markov chain Monte Carlo methods are applied iteratively between the two stages to estimate the posterior distribution. Through both simulation studies and model performance comparisons we find that we can achieve higher overall correct classification rates by accounting for the spatiotemporal correlation in the images and by allowing for a more complex and flexible decision boundary provided by the generalized non-linear model.     

Non-linear state space modelling of fisheries biomass dynamics by using Metropolis-Hastings within-Gibbs sampling

State space modelling and Bayesian analysis are both active areas of applied research in fisheries stock assessment. Combining these two methodologies facilitates the fitting of state space models that may be non-linear and have non-normal errors, and hence it is particularly useful for modelling fisheries dynamics. Here, this approach is demonstrated by fitting a non-linear surplus production model to data on South Atlantic albacore tuna ( Thunnus alalunga ). The state space approach allows for random variability in both the data (the measurement of relative biomass) and in annual biomass dynamics of the tuna stock. Sampling from the joint posterior distribution of the unobservables was achieved by using Metropolis-Hastings within-Gibbs sampling.     

Allocation Processes in Mergers and Acquisitions: An Organizational Justice Perspective

This paper contributes to the understanding of allocation processes in mergers and acquisitions by applying an organizational justice perspective. This is a perspective that has been neglected in past research on mergers and acquisitions, but which is important in understanding the challenges managers face in allocating human resources and other resources of symbolic importance. In particular, the paper examines the trade-offs between multiple goals in selecting distributive and procedural justice rules, and identifies factors that constrain these choices. Mergers and acquisitions are typically driven by multiple motives. The findings presented in this paper suggest that there are different approaches to applying justice rules in mergers and acquisitions and that these approaches have different implications for meeting multiple goals. The choice of equity in combinations with fair procedural rules is an approach which complies with the two goals of maximizing economic productivity and fostering relationships. However, the choice of this approach rests upon an unbalanced power relationship and relatively low ambiguity. When there is a high degree of ambiguity and a balanced power relationship, management has to make trade-offs between maximizing economic productivity and fostering relationships.     

Making Radical Change Happen Through Selective Inclusion and Exclusion of Stakeholders*

The purpose of this paper is to explore how political leaders can gain acceptance for radical reforms through selective inclusion and exclusion of stakeholders. We had inside access to the formulation of a radical reform in the Scandinavian context and found that radical change was not secured through extensive participation, but rather through selective inclusion and exclusion of stakeholders. Change leaders cannot always choose who to include and exclude in participative processes and both proponents and opponents can influence the content in ways that make it less radical. In the context of the public sector, it becomes particularly challenging to gain acceptance for radical reforms because of the influence from multiple stakeholders, many of whom have the right to be included in the process. Based on a study of a Norwegian regulatory reform, we identify five tactics change leaders can use to manage selective inclusion and exclusion. These include deleting stages in the process, including new stakeholders, alternating the process sequence, suppressing issues, and controlling the kind of influence. By consciously including and excluding stakeholders, change leaders can secure that the radicalness of a reform is preserved in the formulation process.