Network diversity,contact diversity,and status attainment

We propose that diversity in social relations measured by network diversity and cross-race/cross-gender contacts affords job seekers higher contact status that in turn brings better status attainment outcomes. Controlling for traditional strength of tie measures and other confounders, the empirical study confirms that (1) network diversity in race and gender are significantly associated with actual utilization of cross-race/cross-gender contacts in job search, (2) use of cross-race/cross-gender contacts is significantly related to higher contact status for nonwhite and female job seekers, but (3) contact status (activated social capital) partially provides jobs of higher SEI scores for white job seekers. Similarly, male job seekers obtain better jobs through female contacts, but the same does not apply to female job seekers. These findings show relative return deficits of social capital experienced by racial minorities and females even when they exert extra effort to obtain heterogeneous social relations and contacts.     

首调唱名法的制度原则对理解西方音乐的启示

理解的对象是文本,音乐的文本指的是用符号记下来的乐谱按照规则而组成的乐句系统。因此,理解西方音乐的关键是对西方音乐文本制度的正确解读。首调唱名法的制度原则给予我们对理解西方音乐最大的启示是,"音"与"乐音"之间的重要区别,即"音"要在具体的音乐制度体系中才有意义。     

The complexity of influence maximization problem in the deterministic linear threshold model

The influence maximization is an important problem in the field of social network. Informally it is to select few people to be activated in a social network such that their aggregated influence can make as many as possible people active. Kempe et al. gave a $(1-{1 \over e})$ -approximation algorithm for this problem in the linear threshold model and the independent cascade model. In addition, Chen et al. proved that the exact computation of the influence given a seed set is #P-hard in the linear threshold model. Both of the two models are based on randomized propagation, however such information might be obtained by surveys and data mining techniques. This will make great difference on the complexity of the problem. In this note, we study the complexity of the influence maximization problem in deterministic linear threshold model. We show that in the deterministic linear threshold model, there is no n ^1??? -factor polynomial time approximation for the problem unless P=NP. We also show that the exact computation of the influence given a seed set can be solved in polynomial time.     

论周作人后期散文风格

本文认为周作人心中“绅士鬼”抬头后散文文风由前期向后期转变 ,风格转向平柔、内省、中庸、隐晦、模糊、清苦和闲适。与“鲁迅风”散文风格相对而另成一格 ,文风柔淡犹疑有余 ,清醒、果断不足     

“Let’s talk about the real issue”: Localized perceptions of environment and implications for ecosocial work practice

ABSTRACT

This interpretive study investigated how residents from socioeconomically challenged communities in North St. Louis understand and make meaning of environmental change and its impact on their well-being. Based on these localized data, we argue that racial minorities facing socioeconomic challenges may experience some environmental issues as less of an immediate concern than violence and racism. However, race and racism shape both the realities of environmental threats as well as residents’ perceptions about environmental injustice in their communities. This study informs ecosocial work practices such as educating communities on local environmental issues and mobilizing community members toward environmental decision-making.     

The Psycho‐Social Processes Linking Income and Volunteering: Chronic Financial Strain and Well‐Being

The positive effect of income on volunteering found in many studies is conventionally explained in utilitarian terms: volunteer work is “costly” or demands “resources.” This explanation overlooks important sociopsychological processes. By situating the income‐volunteering relationship within the stress process framework, we develop a theory that traces the influence of income on chronic financial strain which in turn affects subjective well‐being, which functions as a psychological resource for volunteers. Data taken from two waves of the National Survey of Midlife in the United States confirm this theory: household income has no direct effect on volunteering once chronic financial strain and two measures of subjective well‐being—social and eudaimonic—are taken into account.     

THE WELFARE IMPACT OF TRADE LIBERALIZATION

This paper analyzes the distributional welfare impact of trade liberalization reforms on heterogeneous households. We develop a static applied general equilibrium model, and using a Social Accounting Matrix and Household Expenditure Survey, we calibrate it to match Slovenian data. We simulate the case of Slovenia joining the EU and quantify its welfare impact on households that differ in terms of age, income, and education. Additionally, we compare this benchmark case with two alternative scenarios: (1) a free trade agreement between Slovenia and the EU and (2) a custom union arrangement where tariff revenues are rebated proportionally to the households. We find that while trade liberalization leads to falling consumer prices, increased production in the export sectors, and aggregate welfare gains, the differentiated welfare impacts across heterogeneous households vary in their degrees. (JEL D58, F14, F15)     

Education,Perceived Control,and Volunteering

The consistent effect of education on volunteering has been explained in a number of ways. In this study we test the hypothesis that perceived control beliefs are partly responsible. Using two waves of panel data from National Survey of Midlife in the United States we estimated cross‐lagged structural equation models in which education is positioned as the exogenous variable and perceived control and volunteering are allowed to be reciprocally related across the two waves. We find that perceived control predicts volunteering, but there is no reciprocal effect: volunteering has no effect on sense of control. One reason, therefore, that educated people are more likely to volunteer is that they have stronger control beliefs. The findings enrich the theory of volunteering by introducing the idea of agency, showing one way in which resources influence the decision to volunteer.