A simulation analysis of the impact of family configuration on virtual cellular manufacturing

Past research has shown that it is possible to simultaneously achieve the setup efficiencies of traditional cellular manufacturing systems and the routeing flexibility of a job shop by viewing cells not as permanent, physical structures, but as temporary, 'virtual' entities. This research demonstrates that the advantages of virtual manufacturing cells can be obtained over a range of part family configurations. In particular, virtual cellular manufacturing is robust to changes in the number and size of families being processed. Further, the research shows that the benefits can be obtained under setup conditions impartial to a family-oriented part environment.     

An efficient sequential design of clinical trials

We propose an efficient group sequential monitoring rule for clinical trials. At each interim analysis both efficacy and futility are evaluated through a specified loss structure together with the predicted power. The proposed design is robust to a wide range of priors, and achieves the specified power with a saving of sample size compared to existing adaptive designs. A method is also proposed to obtain a reduced-bias estimator of treatment difference for the proposed design. The new approaches hold great potential for efficiently selecting a more effective treatment in comparative trials. Operating characteristics are evaluated and compared with other group sequential designs in empirical studies. An example is provided to illustrate the application of the method.     

中国加入八国集团研究

八国集团对世界事务的影响举足轻重,中国对于是否加入八国集团表现的顾虑重重。究其原因,一是担心八国集团会架空联合国;二是中国考虑到自己是一个发展中国家,而八国集团从本质上来说是一个富国俱乐部;三是八国集团曾经在1989年制裁过我们。但是,我们加入八国集团却有许多好处:一是可以更好的改善中美关系;二是可以吸引和争取更多的投资和贷款;三是可以从八国集团的内部影响八国集团的决策;四是符合我们的大国外交战略。相反,如果我们长期远离八国集团,就可能在将来被边缘化。在加入的方式上,中国可以先以观察员的身份列席八国首脑会议,等待合适时机,正式加入。     

农村留守老人困境的社会工作干预实验——基于安徽省X县G乡S自然村的实证研究

利用社会工作中的小组工作和地区发展模式,对X县G乡S自然村留守老人的困境进行干预,实验证明,干预工作提升了留守老人解决问题和应对压力的能力;构建和完善了帮助留守老人解决问题和应对压力的社会支持系统。实验结果还证明,社会工作干预方法费时短、成本低、效益高,对解决农村留守老人问题有较强可行性。     

美国沿岸权制度研究

在美国,沿岸权是土地所有人用水权的根据之一,包括但不限于用水和从特定水体收益的权利。依据沿岸权的用水必须属于＂合理＂用水。在普通法中,一项用水是否＂合理＂,根据个案的具体情况进行判断。传统的沿岸权制度体系难以适应水资源日益紧张的客观形势,目前美国大多数实行沿岸权制度的州已经采用行政许可手段对传统的沿岸权体系进行了改造。     

煤炭企业集团发展战略的实证研究——以郑煤集团公司为例

大型煤炭企业近年来越来越重视企业发展战略的研究和制定。本文以郑煤集团为例,对其外部环境应用EFE矩阵、内部环境应用IFE矩阵进行了分析,发现郑煤集团在整个行业中仅处于平均水平,其发展战略亟待改进。在此基础上,本文利用SWOT矩阵为其设计了四类战略方案,并采用QSPM矩阵从中选择出了符合郑煤集团实际发展需要的战略方案。     

哈尔滨航空工业集团的技术发展历程研究

哈尔滨航空工业集团是隶属于中国航空工业第二集团公司的一个大型企业集团,从建国初期的一个修理厂发展为有职工13000余人的大型企业集团,其发展历程大致可以分为三个阶段:建国初期到改革开放以前为其第一发展阶段;改革开放以后到20世纪末为第二发展阶段;21世纪初到现在为其第三发展阶段。三个发展阶段的划分,反映了不同历史时期的政治、经济、环境对企业技术发展的影响。从对三个发展阶段的研究还可以看出,哈航集团的技术进步取得了巨大的成就,为我国航空事业的发展做出了重要贡献,但其技术发展水平同西方发达国家相比,还存在较大差距,因此,应采取积极的措施,以便促进哈航集团的技术发展速度。     

Race–gender Differences in Risk and Protective Factors among Youth in Residential Group Homes

Analysis reported here examined youth in residential group home placements in order to better understand how sexual behaviors, drug use, and environmental experiences differ by race and gender subgroups. Data were collected from 336 youth aged 14–21 residing in one of 41 group homes in Maryland. Chi square and logistic regression analyses were done to determine differences on study variables among the race-gender groupings. Results demonstrate not only significant health concerns overall but notable differences were also found between race-gender subgroups. Findings suggest that found race-gender subgroup differences might be informative for tailoring programming for youth of residential group home settings.     

The Right to Take Risks: Alcohol and Older People

This paper examines policy and practice regarding the purchase of alcohol for older clients of home carers in three local authorities in the Greater London area. Data were gathered from interviews with home carers and their managers, focus group discussions, and a postal survey. None of the local authorities had a written policy or written guidance on alcohol purchase or on appropriate responses to the identification of problematic drinking in older clients. The findings illustrate the problem of balancing "rights" and "risks" within a philosophy of community care which emphasizes client choice and autonomy, and show how policy and practice are "tailored" by local contexts. It is suggested that both home carers and other domiciliary workers, as well as their older clients, could benefit from a clear code of practice regarding responses to alcohol consumption and problematic drinking by older people.     

大学生弱势群体的心理问题探讨

随着高等教育的不断发展,大学生中的弱势群体问题也日渐突出出来,如何应对他们存在的心理问题,已引起高校思想政治工作者的普遍重视,认真分析问题产生的原因,积极探寻解决问题的有效途径和方法,努力提高学生的心理素质,减少弱势群体的存在,帮助他们走出心理困境,身心健康发展,成为社会所需的合格人才。