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161.
We investigate the stability of measured risk attitudes over time, using a 13-year longitudinal sample of individuals in the National Longitudinal Survey of Youth 1979. We find that an individual’s risk aversion changes systematically in response to personal economic circumstances. Risk aversion increases with lengthening spells of employment and time out of labor force, and decreases with lengthening unemployment spells. However, the most important result is that the majority of the variation in risk aversion is due to changes in measured individual tastes over time and not to variation across individuals. These findings that measured risk preferences are endogenous and subject to substantial measurement errors suggest caution in interpreting coefficients in models relying on contemporaneous, one-time measures of risk preferences.  相似文献   
162.
This study examined whether health conditions and service-related environmental factors (i.e. accessibility and infrastructure) affected multidimensional disability (i.e. body function, activity and participation), considering service-related environmental factors as moderators. The sample included 10,451 Korean adults aged 65 and older. The main findings revealed that the number of chronic illnesses negatively influenced multidimensional disability. Better accessibility positively affected all three disability dimensions, whereas infrastructure had different associations with each dimension. Additionally, only infrastructure moderated the associations between chronic illnesses and activity capacity and chronic illnesses and participation frequency. Theoretical, practical and policy implications are discussed.  相似文献   
163.
ABSTRACT

This article examines children and adolescent exposure to violence in various contexts. A systematic review of the literature was conducted to identify the definitions and types of violence reported in studies on victimization using the ecological systems framework. Sources included research studies and/or reports from scholarly journals (n = 140), books (n = 9), conferences/workshops (n = 5), and Web sources, such as Uniform Crime Reports (n = 23). The findings indicated that research differed in terminologies, conceptual and operational definitions, sample sizes, and age group classification for children and adolescents. Furthermore, studies lacked focus on the co-occurrence and interrelatedness of victimization and how these factors might affect the outcomes. Many studies employed a cross-sectional design, which limits strong conclusions about the temporal order of victimization experiences and outcomes. Future research efforts need more consistency among researchers in conceptual and operational definitions and the use of more rigorous designs. Increased holistic assessments are critical for effective prevention and intervention strategies for at-risk children and adolescents.  相似文献   
164.
This study compared middle-aged and older adults with multiple sclerosis (MS, N = 1,275) according to their use of support groups and identified factors associated with perceived need. Over 64.6% (n = 824) of participants had attended a MS support group meeting at least once. Individuals who had never attended a group were more likely to reside in urban or suburban communities, report lower symptom interference, and fewer activity limitations. Women, individuals without a helper, and people with greater symptom interference were more likely to perceive a need for a support group. Findings raise questions for professionals involved in developing and implementing multiple sclerosis support groups.  相似文献   
165.

The main purpose of this study is to examine distinctive aspects of the quality of life (QOL) of Korean government employees utilizing in large part many features of the 1999 QOL survey of Korean government and private sector employees. To this end, responses of government and private sector employees regarding various dimensions of QOL are compared. This study finds that the QOL of government employees is significantly lower than that of private sector employees. The result of regression analysis of QOL dimensions shows that the level of satisfaction with one's work environment is the most influential determinant of the overall QOL of Korean government employees. Based on this finding, this study recommends that the government agencies consider improving their employees' work-related environment.

  相似文献   
166.
International marriage has increased drastically in South Korea in recent years, and by 2005, 13.6 per cent of marriages involved a foreign spouse. The purpose of this study is twofold: to explore the demographic demand and supply of foreign spouses in the marriage market in South Korea, and to examine how social positions of foreign wives vary by their place in the marriage market as determined by their nationality and ethnicity. Data show that the demand for foreign spouses is particularly strong among rural never-married and urban divorced Korean men. Among foreign wives, Chinese, especially Korean Chinese, tend to marry divorced Koreans, partly because many of them have also been married before. The Korean Chinese are the most autonomous among five groups of foreign wives examined, showing the highest rates of Korean citizenship, divorce-separation, and employment. Southeast Asian women tend to marry rural never-married men, and they are the most adaptive to the host society in the way they show among the highest rates of Korean citizenship and employment (after controlling for their poor Korean proficiency and short duration in Korea). Their divorce-separation rate is the lowest regardless of such control. This study demonstrates that marriage migrants adaptation to the host society differs significantly by nationality and ethnic origin.  相似文献   
167.
In this study the Job Demand-Control model was used to study the quality of working life of Dutch secondary teachers. The Job Demand-Control model of Karasek is a theoretical model in which stress and learning are both considered as dependent variables which are influenced by three different task characteristics: job demands, job control, and social support. This model was tested for Dutch secondary teachers (n = 542). Results shed light on the relationship between stress and learning, on the one hand, and the effects of task characteristics on work stress and on work-based learning, on the other hand. It is concluded that the relationship between stress and learning is mediated by the amount of job control as the model predicts. However, the results also reveal that the Karasek model is better suited for explaining stress than for explaining learning. To explain work-based learning variables other than task characteristics have to be taken into account.  相似文献   
168.
We analyze use of a quasi‐likelihood ratio statistic for a mixture model to test the null hypothesis of one regime versus the alternative of two regimes in a Markov regime‐switching context. This test exploits mixture properties implied by the regime‐switching process, but ignores certain implied serial correlation properties. When formulated in the natural way, the setting is nonstandard, involving nuisance parameters on the boundary of the parameter space, nuisance parameters identified only under the alternative, or approximations using derivatives higher than second order. We exploit recent advances by Andrews (2001) and contribute to the literature by extending the scope of mixture models, obtaining asymptotic null distributions different from those in the literature. We further provide critical values for popular models or bounds for tail probabilities that are useful in constructing conservative critical values for regime‐switching tests. We compare the size and power of our statistics to other useful tests for regime switching via Monte Carlo methods and find relatively good performance. We apply our methods to reexamine the classic cartel study of Porter (1983) and reaffirm Porter's findings.  相似文献   
169.
An abundance of flawed software has been identified as the main cause of the poor security of computer networks because major viruses and worms exploit the vulnerabilities of such software. As an incentive mechanism for software security quality improvement, software liability has been intensely discussed among both academics and practitioners for a long time. An alternative approach to managing software security is patch release, which has been widely adopted in practice. In this paper, we examine these two different ways of mitigating customer risk in the software market: liability and patch release. We study the impact of both mechanisms on a monopolistic software vendor's decision on security quality. We find the conditions under which each mechanism is effective in terms of improving security quality and increasing social surplus. The heterogeneous nature of loss is identified to be a key factor for the effectiveness of the liability mechanism. On the other hand, patch release can be effective and welfare‐enhancing regardless of the nature of loss as long as customers incur low patching cost, and/or the vendor incurs low patch development cost. We also examine the impact of customer misperception of the outcome from vulnerable software on the effectiveness of liability.  相似文献   
170.
Dong W. Cho 《决策科学》1977,8(4):663-676
Although the diffusion and transmission of cyclical impulses are basic characteristics of economic and business activities, traditional studies of business cycles do not provide an effective measure of cyclical interaction. The purpose of this paper is to use spectral analysis to determine the cyclical patterns of multivariate economic and business time series. The proposed methodology was applied to the regional industrial diversification problem.  相似文献   
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