自动排课系统中专家系统的建立和分析

人工智能中专家系统是进行推理分析的基础。本文重点分析了专家知识的特点,并提出了在计算机数据库中对专家知识进行表达的方法,提出了一种可行的基于关系数据库的推理机制,使之用于自动排课的专家系统,实现对课程自动科学地编排。     

半模糊超球支持向量机多类分类方法研究

针对支持向量机在大类别模式分类中存在的问题,提出了一种基于半模糊核聚类的超球支持向量机分类方法.该方法首先利用半模糊核聚类方法对样本进行预处理,完成边缘样本的选取,进而以所选样本为训练样本进行超球支持向量机训练,从而有效提高分类器的性能.实验表明,该方法比标准支持向量机多类分类方法具有更高的速度和精度.     

工业设计可塑空间原理解析

工业设计是由技术、艺术与市场三门主体学科构成的融合体 ,可用“可塑空间”表述。其原理可解析为融合的中介、沟通的保证和支持点、艺术形式美原则和造型与传媒广告的设计。由此构成充满创新、宜人的可塑空间原理 ,可以满足需求方在物质和精神上的新需要。     

A Risk Analysis Model of the Relationship Between Beverage Consumption from School Vending Machines and Risk of Adolescent Overweight

Risk analysis is a widely used tool to understand problems in food safety policy, but it is seldom applied to nutrition policy. We propose that risk analysis be applied more often to inform debates on nutrition policy, and we conduct a risk assessment of the relationship of regular carbonated soft drink (RCSD) consumption in schools and body mass index (BMI) as a case study. Data for RCSD consumption in schools were drawn from three data sets: the Continuing Survey of Food Intake by Individuals 1994-1996, 1998 (CSFII), the National Health and Nutrition Examination Survey 1999-2000 (NHANES), and the National Family Opinion (NFO) WorldGroup Share of Intake Panel (SIP) study. We used the largest relationship between RCSD and BMI that was published by prospective observational studies to characterize the maximum plausible relationship in our study. Consumption of RCSD in schools was low in all three data sets, ranging from 15 g/day in NFO-SIP to 60 g/day in NHANES. There was no relationship between RCSD consumption from all sources and BMI in either the CSFII or the NHANES data. The risk assessment showed no impact on BMI by removing RCSD consumption in school. These findings suggest that focusing adolescent overweight prevention programs on RCSD in schools will not have a significant impact on BMI.     

On-Line Scheduling Algorithms for a Batch Machine with Finite Capacity

We study the problem of on-line scheduling jobs with release dates on a batch machine of finite capacity with the objective of minimizing the makespan. We generalize several existing algorithms for the problem to a class of on-line algorithms that are 2-competitive for any arbitrary finite machine capacity. Then, we show that one of these generalized algorithms is in fact 7/4-competitive for machine capacity 2. This is the first on-line algorithm for a finite machine capacity with competitive ratio less than 2.This research is substantially supported by a grant from City Univ. of Hong Kong (Grant No. 7001119). The second author is supported by this grant and by the Natural Science Foundation of China.     

新开"数控机床位置精度测试与补偿"实验的探索

为了满足教学改革对实验教学提出的新要求,自行设计了"数控技术"课程中"数控机床位置精度测试与补偿"新实验,已应用于教学实践,并取得良好的教学效果.文章讨论了新开实验的设计思路、教学内容、教学效果、改进方向等.     

Double machine operation and psychological strain

This study examines the effects of double machine operation on psychological strain. CNC drilling machine operators' reactions to their job were monitored as they rotated between three different work conditions; single machine operation, double machine operation, and double machine operation with additionally high responsibility for products. Results show no effect of double machine operation on strain where responsibility was low. Double machine operation under the condition of high responsibility, however, was found to increase strain.     

面向成套订单问题的工艺规划与排序的集成研究

本文从工艺规划与排序的集成优化角度研究了成套订单问题^[1],克服了单独研究工艺规划和排序局部优化的局限性.文章中考虑了同一工件内部各道工序之间存在的优先加工限制,以及工件在不同机器上加工需要转移时间和工序间接连加工需要机器调整时间的情况,建立了成套订单问题的集成排序模型,并提出了针对求解大规模问题的基于遗传算法的启发式算法,最后通过一个算例对所研究的集成排序问题和所提出的算法进行了说明,计算结果表明了算法的有效性.     

Fathers at Work: A Ghost in the Organizational Machine

This article first provides a review of fatherhood in the gender and organization literature on work and family, and the body and (in)visibility. It observes how organizational assumptions which frame fathers as breadwinners, ignoring their paternal role, remain extraordinarily persistent because policies (no matter how long established) do not necessarily change social attitudes and behaviours. The article then draws upon original qualitative data to demonstrate how while male workers may feel valued as employees, they often feel invisible at work in their paternal role. Fathers perceive that, while family‐friendly policies might in theory be available to ‘parents’ these are in practice targeted at working mothers. The article considers why working men's paternity is so often ignored, as though fathers are a ghost in the organizational machine. A recommendation for the establishment of a fatherhood and motherhood passport is made.     

TIMSS试题的机器翻译系统构建及其效果

研究以范例为基础的机器翻译技术和英汉双语对应的结构辅助英汉单句语料的翻译。翻译范例是运用一种特殊的结构,此结构包含来源句的剖析树、目标句的字符串、以及目标句和来源句词汇对应关系。将翻译范例建立数据库,以提供来源句作词序交换的依据,最后透过字典翻译,以及利用统计式中英词汇对列和语言模型来选词,产生建议的翻译。研究是以2010年国际数学与科学教育成就趋势调查测验试题为主要翻译的对象,以期提升翻译的一致性和效率。以NIST和BLEU的评比方式,来评估和比较在线翻译系统和本系统所达成的翻译质量。