On the structure of minimal winning coalitions in simple voting games

According to Coleman’s index of collective power, a decision rule that generates a larger number of winning coalitions imparts the collectivity a higher a priori power to act. By the virtue of the monotonicity conditions, a decision rule is totally characterized by the set of minimal winning coalitions. In this paper, we investigate the structure of the families of minimal winning coalitions corresponding to maximal and proper simple voting games (SVG). We show that if the proper and maximal SVG is swap robust and all the minimal winning coalitions are of the same size, then the SVG is a specific (up to an isomorphism) system. We also provide examples of proper SVGs to show that the number of winning coalitions is not monotone with respect to the intuitively appealing system parameters like the number of blockers, number of non-dummies or the size of the minimal blocking set.     

The Attitudes of Social Work Students Toward End-of-Life Care Planning

This study examined the attitudes of social work students toward end-of-life care planning, as well as their degree of willingness to engage in this area of social work practice. Factors associated with their attitudes were measured through structured surveys completed by 102 social work students (N = 102) at a school of social work in the southeast. Results indicated that these social work students tended to have positive attitudes toward end-of-life care planning in general. Moreover, these attitudes were positively associated with preference for pain relief treatment, higher levels of comfort when discussing death, more emphasis on self-determination, and apprehension of conflicts of self-determination. The results of this study underscored the increased societal need for recognition of personal preferences in end-of-life care, higher levels of comfort when discussing death, and an increased commitment of social workers' to maintaining the ethical principle of the client's right to self-determination in end-of-life planning. While this is not surprising, it points to a continuing need to re-assess where the field stands in its preparation of social work professionals who will work closely with people who are dying and their families.     

Dictatorship on top-circular domains

We consider domains with a natural property called top-circularity. We show that if such a domain satisfies either the maximal conflict property or the weak conflict property, then it is dictatorial. We obtain the result in Sato (Rev Econ Des 14(3):331–342, 2010) as a corollary. Furthermore, it follows from our results that the union of a single-peaked domain and a single-dipped domain (with respect to a given ordering over the alternatives) is dictatorial.     

North Americans' Attitudes Toward Illegal Drugs

Public opinion polls conducted from 1969 to 2003 found a variety of opinions on the use, possession, and legalization of marijuana. Public opinion about legalizing marijuana use is increasing, but it is also increasing toward harsher penalties for those who possess a small amount of marijuana. Public opinion regarding the legalization of illegal drugs appears to be influenced by the times. The majority of Americans increasingly believe that the country has made some progress in dealing with the problems of illegal drugs, but Americans are also reporting more difficulty within their families related to marijuana. This article examines trends based in public opinion polls on the use of marijuana in the United States and Canada and discusses the social and political history of marijuana and the biophysical effects, medical uses, definitions, and previous research related to marijuana.     

Measuring Family Caregiver Perceptions of Support in Caring for Children and Youth With Mental Health Concerns

ABSTRACT

This correlational study assessed how families of children with mental illness perceived the levels of support they received from informal and formal resource providers and the associations between perceived support and child outcomes. Adult caregivers (N = 904) of youth receiving public mental health care services were administered the Family Caregiver Perceptions of Support Scale developed by the authors to assess family caregiver perceptions of support prior to and at termination of services. Factor analysis identified three types of caregiver anticipated supports: informal support resources, support for treatment plan influence, and health care resources. The domains were significantly and positively associated with one another but did not uniformly correlate with youth mental health outcomes. The study provides preliminary evidence that treatment gains in youth mental health outcomes are observed when caregivers perceive support in treatment processes. Suggestions for future research are made, stressing the importance of caregivers and providers working together and describing needs related to future scale improvements.     

Future of long-term care financing for the elderly in Korea

With rapid aging, change in family structure, and the increase in the labor participation of women, the demand for long-term care has been increasing in Korea. Inappropriate utilization of medical care by the elderly in health care institutions, such as social admissions, also puts a financial burden on the health insurance system. The widening gap between the need for long-term care and the capacity of welfare programs to fulfill that need, along with a rather new national pension scheme and the limited economic capacity of the elderly, calls for a new public financing mechanism to provide protection for a broader range of old people from the costs of long-term care. Many important decisions are yet to be made, although Korea is likely to introduce social insurance for long-term care rather than tax-based financing, following the tradition of social health insurance. Whether it should cover only the elderly longterm care or all types of long-term care including disability of all age groups will have a critical impact on social solidarity and the financial sustainability of the new long-term care insurance. Generosity of benefits or the level of out-of-pocket payment, the role of cash benefits, and the relation with health insurance scheme all should be taken into account in the design of a new financing scheme. Lack of care personnel and facilities is also a barrier to the implementation of public long-term care financing in Korea, and the implementation strategy needs to be carved out carefully.     

Cox regression analysis in presence of collinearity: an application to assessment of health risks associated with occupational radiation exposure

This paper considers the analysis of time to event data in the presence of collinearity between covariates. In linear and logistic regression models, the ridge regression estimator has been applied as an alternative to the maximum likelihood estimator in the presence of collinearity. The advantage of the ridge regression estimator over the usual maximum likelihood estimator is that the former often has a smaller total mean square error and is thus more precise. In this paper, we generalized this approach for addressing collinearity to the Cox proportional hazards model. Simulation studies were conducted to evaluate the performance of the ridge regression estimator. Our approach was motivated by an occupational radiation study conducted at Oak Ridge National Laboratory to evaluate health risks associated with occupational radiation exposure in which the exposure tends to be correlated with possible confounders such as years of exposure and attained age. We applied the proposed methods to this study to evaluate the association of radiation exposure with all-cause mortality.