Efficient Heuristics for MRP Lot Sizing with Variable Production/Purchasing Costs*

Two heuristics based on branch and bound (B&B) are developed to solve closed-loop material requirements planning (MRP) lot-sizing problems that have general product structures and variable costs. A “look ahead method'’(LAM) heuristic allows for variable production/purchasing costs and uses a single-level B&B procedure to rapidly improve lower bound values; thus, LAM efficiently uses computer-storage capacity and allows solution of larger problems. The “total average modification'’(TAM) heuristic uses B&B, applied level by level, and modified setup and carrying costs to solve the variable production/purchasing costs MRP lot-sizing problem. LAM and TAM are tested on problems and compared to heuristics in the literature. TAM may be used to solve large MRP lot-sizing problems encountered in practice.     

Integrating Analysis and Communication Skills into the Decision Science Curriculum*

The teaching of decision sciences presupposes that careful attention is directed toward improving students' critical thinking and analytical skills. This paper presents an approach to teaching quantitative methods classes that focuses on developing student skills in the areas of analytical and critical thinking through written and oral communication. The approach requires very little additional instructor preparation time and does not require the instructor to make major changes in either the content or organization of the course. While the instructor's investment is minimal, the benefits to the students appear to be substantial.     

Beyond “filling in the gap”: the state and status of Latina/o Feminist Media Studies

Against the socio-economic and cultural backdrop of the ongoing Latina/o media “boom,” this critical literature review delineates the location and status of contemporary Latina/o Feminist Media Studies. Departing from a critique of current mainstream Feminist Media Studies research and citational practices, it traces the influence of rapidly expanding transnational Latina/o media markets, the gendering of Latinidad, and transnational feminisms on recent Latina/o Feminist Media Studies scholarship. As it not only breaks with exclusively domestic analyses of intersectionality and accurately reflects twenty-first century media’s transnational orientation, this essay argues that the theoretical paradigms and thematic concerns of Latina/o Feminist Media Studies must ultimately be reframed as central, not marginal, to Feminist Media Studies research.     

Which Spouse Initiates Marital Separation When There Are Children Involved?

This report examines whether the presence of children in marriage differentially influences the risk of wives or husbands initiating separation. The analytic sample consists of 9,118 first marriages from the Households, Income and Labour Dynamics in Australia survey (2001). Using event history and competing risks analysis, I find weak evidence that wives are less likely than husbands to initiate when they have infants, and husbands are less likely than wives to initiate when children are school age or older. Overall, the results show that children deter marital separation for both wives and husbands, indicating that gender differences in the decision to separate are likely attributable to other factors such as a willingness to remain in an unhappy marriage.     

Communicative Correlates of Satisfaction,Family Identity,and Group Salience in Multiracial/Ethnic Families

Guided by the Common Ingroup Identity Model ( S. L. Gaertner & J. F. Dovidio, 2000 ) and Communication Accommodation Theory ( C. Shepard, H. Giles, & B. A. LePoire, 2001 ), we examined the role of identity accommodation, supportive communication, and self‐disclosure in predicting relational satisfaction, shared family identity, and group salience in multiracial/ethnic families. Additionally, we analyzed the association between group salience and relational outcomes as well as the moderating roles of multiracial/ethnic identity and marital status. Individuals who have parents from different racial/ethnic groups were invited to complete questionnaires on their family experiences. Participants (N = 139) answered questions about relationships with mothers, fathers, and grandparents. The results of the multilevel modeling analyses are discussed in terms of implications for understanding multiracial/ethnic families and family functioning.     

Fathering With Multiple Partners: Links to Children's Well‐Being in Early Childhood

The claim that multiple partner fertility may pose a risk of adverse outcomes for children has not been tested. We test this argument using a sample of 4,027 resident fathers and children from the Fragile Families and Child Well‐being Survey by examining the pathways through which fathers' multipartnered fertility is associated with children's externalizing behaviors and physical health status at 36 months. Path analyses indicate that multiple partner fertility exerted both a significant direct and indirect effect through paternal depression to influence children's externalizing behaviors. Fathers' multiple partner fertility also exerted a significant indirect effect through one mediator—father involvement—to influence children's physical health. This evidence suggests that the disruptions brought about by multipartnered fertility are important for understanding child well‐being.     

埃伦?伍德对20世纪70年代后西方新左翼理论的批判--以普兰查斯、拉克劳-墨菲和后现代主义为典型

埃伦?伍德批评20世纪70年代后西方新左翼在理论上日渐背离经典马克思主义,其中以普兰查斯、拉克劳与墨菲、后现代主义最为典型。在她看来,普兰查斯过分抬高了意识形态与政治的重要性,其理论中存在诸多矛盾与混乱,并具有很大的危害;而拉克劳与墨菲的理论中存在诸多对马克思和马克思主义的误读,其“激进民主”方案也缺乏可靠的社会根基,政治策略本质上是一种改良主义;后现代主义的产生有其特定的历史根源,其理论逻辑混乱,政治主张亦具有很大的迷惑性并可能导致严重后果。伍德批判的出发点在于捍卫经典马克思主义的思想地位,其中贯穿着马克思主义思维方法,但在有些问题上批判过于笼统,分寸上也不是很适当。     

包头师范学院有机化学实验教学改革探索

本文介绍了有机化学实验课程教学中存在的问题,初步探讨了包头师范学院化学、应用化学专业在有机化学实验教学过程中对实验教学内容、实验教学方式、实验室三废处理、学生成绩评定等方面进行的改革以及取得的成果。     

包头师范学院公共体育课教学模式改革的研究

目前我国各高校对公共体育课教学的改革以深入展开,其中公共体育教学模式的改革已是研究的热点问题之一。本文根据国内外研究现状及趋势结合我校的实际教学状况探讨我校公共体育教学改革的新思路,并在此研究的基础上,尝试构建新的,更为有效、合理的教学模式。此研究对于探讨有效开展大学体育新教改理念的教学实践活动提供理论依据和具体的教学应用技术,无疑具有重要的实践意义。     

Shame and pride in second-generation German identity in Melbourne,Australia: emotions and white ethnicity

As members of an established, well-integrated, white ethnic group, second-generation Germans are largely invisible in Australian society. Given this, they are easily presumed a group for whom Gans’ notion of ‘symbolic ethnicity’ might apply. However, based on interviews with adult children of German immigrants in Melbourne, Australia, this article suggests an alternative interpretation using recent literature on the role of emotions for identity. In the interviews with adult children of German immigrants in Melbourne, Australia, the notions of shame and pride in relation to ethnic identity were clearly evident. Shame often emerged in interaction with other people in Australia, and particularly in relation to Nazism and the Second World War. However, most respondents felt equally proud of their German heritage, particularly later in life. These findings suggest that ethnic identity for these second-generation Germans is a deeper, embodied experience that is similar to what Bourdieu terms habitus.