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排序方式: 共有481条查询结果,搜索用时 15 毫秒
21.
Reuven Cohen Mira Gonen Asaf Levin Shmuel Onn 《Journal of Combinatorial Optimization》2017,33(2):645-659
In this paper we define the exact k-coverage problem, and study it for the special cases of intervals and circular-arcs. Given a set system consisting of a ground set of n points with integer demands \(\{d_0,\dots ,d_{n-1}\}\) and integer rewards, subsets of points, and an integer k, select up to k subsets such that the sum of rewards of the covered points is maximized, where point i is covered if exactly \(d_i\) subsets containing it are selected. Here we study this problem and some related optimization problems. We prove that the exact k-coverage problem with unbounded demands is NP-hard even for intervals on the real line and unit rewards. Our NP-hardness proof uses instances where some of the natural parameters of the problem are unbounded (each of these parameters is linear in the number of points). We show that this property is essential, as if we restrict (at least) one of these parameters to be a constant, then the problem is polynomial time solvable. Our polynomial time algorithms are given for various generalizations of the problem (in the setting where one of the parameters is a constant). 相似文献
22.
Research linking childhood physical abuse (CPA) and adult intimate partner aggression (IPA) has focused on individuals without sufficient attention to couple processes. In this study, 109 couples reported on histories of CPA, IPA, and anger expression. Actor-partner interdependence model (APIM) was used to examine links between CPA and revictimization and perpetration of IPA, with anger suppression as a potential mediator. Women's CPA histories were associated with more physical aggression towards and more revictimization by partners. Men's CPA histories were only associated at the trend level with their revictimization. Anger suppression fully mediated the link between women's CPA and both revictimization and perpetration of IPA. Findings suggest that women with CPA histories are more prone to suppress anger, which leaves them at greater risk for revictimization and perpetration of IPA. 相似文献
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This article provides a comprehensive overview of the Hmong in America and encompasses their mental health status for the past 35 years. Since their mass arrival to the United States in 1975, limited research has been compiled to track the specific mental health issues that affect this collective community alone. Major chronological research findings were compiled for this article and specific findings concerning the Hmong and their mental health issues were compared to findings for other Southeast Asian groups. In conclusion, the findings of this article indicate that the Hmong still have higher rates of being diagnosed with depression, the lowest help-seeking behaviors in utilizing Western medicine, and the lowest arithmetic average of "happiness" scaled on an assessment tool. The purpose of this article is to better steer future research projects that entail tracking and differentiating the specific mental health domains of the Hmong. 相似文献
25.
Tali Kristal Yinon Cohen Guy Mundlak 《Research in social stratification and mobility》2011,29(4):351-369
In this paper, we analyze the distribution of fringe benefits among workers and underline its implications for income inequality. To this end, we develop a positional approach to inequality based on the concept of rent as a potential link between positions and their rewards. We hypothesize that workers extract rent in the form of benefits in industries with worker leverage (in the form of unioniziation, internal labor market, and public employment) or share rent with firms in highly profitable industries that endure for efficiency wage reasons. On the basis of a unique dataset from Israel, we test these hypotheses by estimating the probabilities of obtaining benefits according to industries’ structural features while controlling for cross-industrial differences in workers’ demographic and human capital characteristics. The analyses reveal that benefits are determined by structural factors, representing a separate dimension of the rewards attached to positions, different from earnings. We further stress the importance of incorporating fringe benefits into inequality research, given that benefits together with earnings stratify workers and evidently signify structured positions in the economy. 相似文献
26.
Summary. A unique aspect of the social work profession is the combination of intervention on the personal, community, and societal levels and their interaction. The purpose of this research is to determine students’ perceptions of community practice. Qualitative research was conducted among Israeli social work students before gaining any practical experience in community practice. Findings. The results demonstrated a change in students’ perceptions of the importance of community practice to the profession, and the factors that contributed to this change. Applications. Recommendations that may contribute to changing students’ perceptions of community practice are offered to educators. 相似文献
27.
Orna Cohen Ph.D. Dorit Segal‐Engelchin M.S.W. 《Smith College studies in social work》2013,83(3):475-500
This paper analyzes the “gender strategies” of a sample of Israeli women social workers as evidenced in the recommendations that they write for the courts on custody and visiting rights for divorcing couples. Textual analysis of these reports reveals what Hochchild terms a “traditional gender strategy,” manifested in a consistent pattern of gender stereotyping. There are clear differences in the way the social workers present the husband and wife as persons, both separately and in relation to one another, and in the roles that they expect them to fulfill, with the man being assigned the provider role and the woman the parent role. Even the way they collect information about the two parents' relationships with their children is different. The paper concludes with a discussion of the practical implications of the findings. 相似文献
28.
Abstract There is a growing emphasis in the social work literature that social work's overall mission should be that of social justice and that mental health be relegated as outside of social work's realm. This paper draws upon a constructionist and narrative perspective in developing a general formulation of clinical social work to bridge the gap between social justice and mental health. 相似文献
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Jeffrey H. Cohen Nidia Merino Chavez 《International migration (Geneva, Switzerland)》2013,51(2):24-31
Columbus, Ohio has witnessed rapid growth in its Latino population as immigrants settle in the city to access jobs and a generally low cost of living. Immigrants also face discrimination as they settle in Columbus and interact with the city's citizens. In this paper, we note how discrimination plays out in social and economic isolation; a lack of programmes to support the incorporation of Latinos in the city; and state laws that target immigrants. We present results of ongoing ethnographic work with the Latino community in Columbus. 相似文献