Genetic algorithm to production planning and scheduling problems for manufacturing systems

Fundamental and extended multi-objective (MO) models are designed to address earliness/tardiness production scheduling planning (ETPSP) problems with multi-process capacity balance, multi-product production and lot-size consideration. A canonical genetic algorithm (GA) approach and a prospective multi-objective GA (MOGA) approach are proposed as solutions for different practical problems. Simulation results as well as comparisons with other techniques demonstrate the effectiveness of the MOGA approach, which is a noted improvement to any of the existing techniques, and also in practice provides a new trend of integrating manufacturing resource planning (MRPII) with just-in-time (JIT) in the production planning procedure.     

高效率内旋式海参吸捕装置吸嘴结构设计及参数优化

为了提升海参吸捕装置吸嘴性能以提高系统的效率，课题组在传统直管状吸嘴的基础上，提出了内涡旋式吸嘴和外涡旋式吸嘴2种新式结构。通过对直管状吸嘴、锥形罩吸嘴、内涡旋式吸嘴和外涡旋式吸嘴进行FLUENT仿真分析，筛选出管口轴线高度和吸拾能力均最强的吸嘴；通过正交试验法得到最优的吸嘴结构；最后通过搭建实验平台进行吸嘴实验验证。仿真与实验结果表明：内涡旋式吸嘴管口轴线高度和吸拾能力均最强，且内流道涡旋式引导板宽度20 mm、内流道涡旋式引导板的高度30 mm和内涡旋式引导板的螺距130 mm时效率最高。该研究有利于提高海参吸嘴在实际应用中的吸捕效率。     

Children with challenging behaviour: past and present in the United Kingdom

The aim of this paper is to give a brief overview of the historical and current understanding of and care for children with learning difficulties who displayed challenging behaviour in the United Kingdom. It is clear that challenging behaviour is not a new phenomenon but has existed throughout the history of learning difficulty.     

东乡族女童教育现状及对策思考

本文依据第一手的实地调查资料 ,概括了东乡族女童的受教育现状 ,分析了这一现象产生的原因 ,并提出了相关建议     

《侵权责任法》医疗损害责任归责原则体系评析

《侵权责任法》第七章"医疗损害责任"立足司法实践,借鉴域外经验,创设了一般归责原则与特殊归责原则相结合的归责原则体系,有利于依法平衡医患利益与妥善解决医患纷争。这一体系的设计也存在一些问题,造成各种归责原则之间逻辑不清,界限不明,影响《侵权责任法》的准确理解与正确适用。建议有关部门尽快制定相关司法解释,为准确适用法律提供参考。     

重温弗雷泽——简述西方人类学界关于弗雷泽的论争

弗雷泽在西方人类学史上的地位和影响颇为复杂,其人类学研究方法、研究内容、写作范式、作品价值、个人地位和影响等问题在西方人类学界曾引起广泛争议和讨论,而相关论争并不为国内学界所熟知。对20世纪60年代和80年代西方人类学界的两场关于弗雷泽的重要论争进行回顾和梳理,按图索骥,旨在以此表现"弗雷泽问题"的复杂性及其与人类学发展诸问题的关联性,有利于国内人类学研究的进一步深入展开。     

Personality and Life Events as Predictors of Adolescents’ Life Satisfaction: Do Life Events Mediate the Link Between Personality and Life Satisfaction?

This study examined the association among personality traits, life events and life satisfaction, and the underlying pathways from personality traits to life satisfaction. A total of 1,961 adolescents were recruited from 21 secondary schools in Hong Kong. The adolescent version of the Chinese Personality Assessment Inventory (CPAI-A), the Chinese Adolescent Life Events Checklist (CALEC) and the Satisfaction With Life Scale (SWLS) were employed to assess their personality, life events and life satisfaction, respectively. Multiple regression analysis showed there was an additional value of the indigenously derived scales of CPAI-A, including the Family Orientation, Harmony and Ren-Qing scales, in predicting life satisfaction beyond the universal personality traits. Results also indicated that there was a partial mediation effect of negative life events on personality traits in the prediction of life satisfaction.     

Some Properties of the Hazard Function of the Two-Mutation Clonal Expansion Model

We discuss the hazard function of the two-mutation clonal expansion model with time-dependent parameters, with particular emphasis on identifiability of the parameters. We explicitly construct identifiable parameter combinations, and illustrate the properties of the hazard function under perturbations of the underlying biological parameters.     

Psychological Stress and Parenting Behavior Among Chinese Families: Findings from a Study on Parent Education for Economically Disadvantaged Families

With the recognition of the crucial role of family and with the belief that parents have the greatest influence on a child’s life, family and parent education has been widely practiced in Hong Kong and many other countries as measure for poverty alleviation. A study, employed quantitative method of a cross-sectional parent survey (N = 10,386) was conducted to comprehend needs and parenting practice of poor families, and to identify appropriate strategies to promote family and parent education in Hong Kong. Regression analysis was used to investigate the association between family variables, psychological stress and parenting behavior. The study identified five categories of disadvantaged families and salient factors that distinguished families from the normal population based on the findings of discriminant analysis. Moreover, data indicates that family relationship and social networks are protective factors to economically disadvantaged families, whereas sense of powerlessness amplifies the negative effects of low income. Base on the findings, the paper suggests that strategies for poverty alleviation that focus purely on parenting or parent education are fragmented and fail to address the complexity of poverty as a social issue. A holistic perspective that goes beyond the scope of parent education to support families, adopting a family perspective in poverty-alleviation work and service provision, and addressing barriers constrain parenting are the future service directions.