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1.
可重构制造系统重构算法的实例研究   总被引:19,自引:0,他引:19  
可重构制造系统(RcMS)的模型及其重构算法是可重构制造系统的形式化表示,是研究RcMS优化的理论基础,基于赋时可重构Petri网的可重构制造系统模型(TRPN-RcMS)及其重构算法是RcMS的形式化表示方法之一。文中以实例对RcMS重构算法进行说明和论证。首先假设一个RcMS的实例系统;然后,根据RcMS的当前系统组成及其生成计划生成RcMS当前系统的TRPN-RcMS模型;最后,根据RcMS重构后的系统组成及其生产计划的变化情况,利用RcMS的TRPN-RcMS模型的重构算法,生成重构后的系统的TRPN-RcMS模型。  相似文献
2.
Abstract  Online discussion forums are an increasingly common use of new information and communication technologies in education. As a tool for promoting conversational modes of learning, it has been suggested that online discussion forums can lead to enhanced learning outcomes for students. However, there is a need to explore further the implications of the highly mediated nature of computer–based interaction on student learning within these virtual learning environments. This paper presents results from a detailed study of students' learning outcomes and patterns of interaction within an online discussion forum. The findings suggest that the typical nonlinear branching structure of online discussion may be insufficient for the realisation of truly conversational modes of learning. The paper discusses the implications of these findings in relation to students' learning.  相似文献
3.
The challenges of redressing the digital divide: a tale of two US cities   总被引:5,自引:0,他引:5  
Abstract.  In this paper, we examine efforts undertaken by two cities – Atlanta and LaGrange, Georgia – to redress the digital divide. Atlanta's initiative has taken the form of community technology centres where citizens can come to get exposure to the internet, and learn something about computers and their applications. LaGrange has taken a very different approach, providing free internet access to the home via a digital cable set-top box. Using theoretical constructs from Bourdieu, we analysed how the target populations and service providers reacted to the two initiatives, how these reactions served to reproduce the digital divide, and the lessons for future digital divide initiatives. In our findings and analysis, we see a reinforcement of the status quo. When people embrace these initiatives, they are full of enthusiasm, and there is no question that some learning occurs and that the programmes are beneficial. However, there is no mechanism for people to go to the next step, whether that is technical certification, going to college, buying a personal computer or escaping the poverty that put them on the losing end of the divide in the first place. This leads us to conclude that the Atlanta and LaGrange programmes could be classified as successes in the sense that they provided access and basic computer literacy to people lacking these resources. However, both programmes were, at least initially, conceived rather narrowly and represent short-term, technology-centric fixes to a problem that is deeply rooted in long-standing and systemic patterns of spatial, political and economic disadvantage. A persistent divide exists even when cities are giving away theoretically 'free' goods and services.  相似文献
4.
Case study is a suitable research methodology for software engineering research since it studies contemporary phenomena in its natural context. However, the understanding of what constitutes a case study varies, and hence the quality of the resulting studies. This paper aims at providing an introduction to case study methodology and guidelines for researchers conducting case studies and readers studying reports of such studies. The content is based on the authors’ own experience from conducting and reading case studies. The terminology and guidelines are compiled from different methodology handbooks in other research domains, in particular social science and information systems, and adapted to the needs in software engineering. We present recommended practices for software engineering case studies as well as empirically derived and evaluated checklists for researchers and readers of case study research.  相似文献
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6.
This paper presents a decision support system for cyclic master surgery scheduling and describes the results of an extensive case study applied in a medium-sized Belgian hospital. Three objectives are taken into account when building the master surgery schedule. First of all, the resulting bed occupancy at the hospitalization units should be leveled as much as possible. Second, a particular operating room is best allocated exclusively to one group of surgeons having the same speciality; i.e., operating rooms should be shared as little as possible between different surgeon groups. Third, the master surgery schedule is preferred to be as simple and repetitive as possible, with few changes from week to week. The system relies on mixed integer programming techniques involving the solution of multi-objective linear and quadratic optimization problems, and on a simulated annealing metaheuristic.  相似文献
7.
基于案例教学的“人工智能”教学的实践与探索   总被引:4,自引:2,他引:2  
本文结合教学实践,从基于案例的教学及教学内容、教学手段、实践教学等几个方面探讨了“人工智能”课程的教学。  相似文献
8.
Mobile learning in teacher training   总被引:3,自引:0,他引:3  
Abstract  This paper describes a mobile learning project, where mobile devices are used for educational activities. The main focus of this paper is teacher training. Experiences on the use of mobile technology and how it was used in teacher training, especially how trainees and supervising teachers felt about it, are presented. The pilot study was carried out at the Department of Home Economics and Craft Science in University of Helsinki. The idea of the pilot was that the supervising teacher and trainee students could discus and share their ideas about teaching methods through the mobile device and use of a short message service (SMS) and digital pictures as a part of the supervising process. The use of digital pictures which were delivered via the mobile device proved to be surprisingly successful. The goal of these innovative pilot projects is to create flexible teaching solutions, which will enable access to information using different devices, and support learning in a variety of situations.  相似文献
9.
Factors contributing to teachers' successful implementation of IT   总被引:3,自引:0,他引:3  
Abstract It has become increasingly important for educators to examine successful ICT implementations with the aim of understanding precisely what makes them successful in teaching and learning. In this study, an analysis of data from qualitative case studies of four Canadian schools illuminates factors that facilitate successful ICT implementation. Findings suggest that informal ICT education, such as 'just-in-time' learning, is most influential. Furthermore, supportive and collaborative relationships among teachers, a commitment to pedagogically sound implementation of new technologies, and Principals who encourage teachers to engage in their own learning are viewed as highly useful factors.  相似文献
10.
中国省级环境信息系统建设   总被引:3,自引:0,他引:3  
本文介绍覆盖我国27个省的省级环境信息系统(PEIS)的总体设计、主要内容、软硬件环境、开发方法和特点。采用客户/服务器结构、大型关系数据库技术、地理信息系统等手段,建成的系统基本满足省级环境管理需要。  相似文献
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