Defining a complex intervention: The development of demarcation criteria for “meditation”.

The authors used a 5-round Delphi study with a panel of 7 experts in meditation research to achieve agreement on a set of criteria for a working definition of “meditation” for use in a comprehensive systematic review of the therapeutic use of meditation. Participants agreed that essential to a meditation practice is its use of (a) a defined technique, (b) logic relaxation, and (c) a self-induced state. Participants also agreed that a meditation practice may (d) involve a state of psychophysical relaxation somewhere in the process; (e) use a self-focus skill or anchor; (f) involve an altered state/mode of consciousness, mystic experience, enlightenment or suspension of logical thought processes; (g) be embedded in a religious/spiritual/philosophical context; or (h) involve an experience of mental silence. The results of this study provide insight into the challenges faced by researchers who want to demarcate meditative practices from nonmeditative practices, and they describe an approach to this problem that may prove useful for researchers trying to operationalize meditation in the context of comparative research. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于LibreCAD的电火花线切割CAM实体排序算法研究

在电火花线切割CAM软件的开发过程中,针对DXF文件的实体排序问题,提出了基于Libre CAD文件读取的实体排序算法,可同时实现封闭图形、非封闭图形及多图形文件的实体排序。通过分析DXF文件中实体自身的排序特点,提出了一种用于处理大数据量实体搜索的记忆搜索算法,基于前一步搜索的实体进行区域内智能搜索。经过数值计算及实际测试对比,记忆搜索算法能实现高适应性、高准确率、高效率的实体搜索与排序。     

基于任务驱动的模具CAD/CAM实训体系改革

模具CAD/CAM技术是现代模具技术重要的发展方向,《模具CAD/CAM》课程培养的是现代模具企业急需的应用性技能。本文结合模具企业生产模具的真实过程,介绍了基于任务驱动的《模具CAD/CAM》实训体系,并对该体系中六个主任务模块所要开展的实训项目和要达到的能力培养目标进行了说明。优化后的《模具CAD/CAM》实训体系符合高职高专的教育理论和教育规律,加强了学生实践能力和创新精神的培养,体现了教、学、做一体化的特色。     

基于MasterCAM的印章加工方法研究

印章是常见的办公用品.利用MasterCAM软件对印章进行了加工设置,介绍了采用曲面加工对印章进行加工的方法,达到了提高加工效率,提升加工质量的目的.     

电子绣花机圆柱剪线凸轮的自动编程及数控加工

本文对在轻工机械中应用广泛的圆柱凸轮的计算机辅助编程和计算机辅助制造进行了初步研究，为空间立体凸轮的编程及加工提供了参考。     

新型的CAD／CAM人机接口的研究

集中讨论了ＣＡＤ／ＣＡＭ系统人机交互的特点，抽象出完整的接口模型，并以此为基础实现了接口开发工具的设计，提高了软件的开发效率。     

模具造型机器人运动规划

本文建立了一种结构简单、行之有效的平面运动规则系统，能迅速判断机器人与工件的关系，实现了模具造型机器人无碰撞轨迹规划。     

薄壁元件的变形量研究

本文通过实验对薄壁元件切削加工的专家系统进行了开发性研究,首先对薄壁元件切削加工的有关参数及条件等进行了分析和实验优化,然后将优化的切削加工数据按特殊的逻辑关系存入计算机,从而实现了其在CAD/CAM系统中的自动调用。     

Intelligent Programming of CNC Turning Operations using Genetic Algorithm

CAD/CAM systems are nowadays tightly connected to ensure that CAD data can be used for optimal tool path determination and generation of CNC programs for machine tools. The aim of our research is the design of a computer-aided, intelligent and genetic algorithm(GA) based programming system for CNC cutting tools selection, tool sequences planning and optimisation of cutting conditions. The first step is geometrical feature recognition and classification. On the basis of recognised features the module for GA-based determination of technological data determine cutting tools, cutting parameters (according to work piece material and cutting tool material) and detailed tool sequence planning. Material, which will be removed, is split into several cuts, each consisting of a number of basic tool movements. In the next step, GA operations such as reproduction, crossover and mutation are applied. The process of GA-based optimisation runs in cycles in which new generations of individuals are created with increased average fitness of a population. During the evaluation of calculated results (generated NC programmes) several rules and constraints like rapid and cutting tool movement, collision, clamping and minimum machining time, which represent the fitness function, were taken into account. A case study was made for the turning operation of a rotational part. The results show that the GA-based programming has a higher efficiency. The total machining time was reduced by 16%. The demand for a high skilled worker on CAD/CAM systems and CNC machine tools was also reduced. Received: September 2004 / Accepted: September 2005     

点云数据与CAD/CAM软件接口方法研究与实现

测量系统获得的点云数据只有转换成CAD/CAM软件所要求的格式才能被其接受并完成建模。本文针对CAXA、UG、Pro/E三种常用CAD/CAM软件接受点云数据的格式进行了深入研究并实现了数据接口。