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INTRODUCTION Pneumatic devices are traditionally used as airclamp to position worktable tools, because they cantransfer a wild range of power at the high responsespeed of the actuators; while electro-servo systemsare used in the areas where servo control and accuratepositioning control are the basic requirements such asin process automation and robotics. There are twolimitations in the use of pneumatic technology inthese areas. The first one is the compressibility of theatmosphere, leadin… 相似文献
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CHOI Jin-hwa JEON Byung-cheol KIM Gun-hee SHIN Bong-cheol LEE Honghee CHO Myeong-woo SEONG Eun-je PARK Dong-sam 《浙江大学学报(A卷英文版)》2006,7(9):1474-1481
INTRODUCTION Today, the manufacturing industry makes con- stant effort in order to construct an E-manufacturing system using information technology for effective production control, and then, it offers the integrated production control to the workers, the production managers, and the consumers, etc. (Lee, 2003; Choi, 2004). In the mould manufacturing industry, the process managers often request paperwork to know the information of the processes on CNC machine tools or they visit the shop… 相似文献
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The contradiction between the rapid growth of training demand and the current tense teachers and equipment is becoming increasingly fierce. In order to effectively alleviate the pressure of civil aviation institutions to control the shortage of simulators and control teachers,we train new engineering talents who can adapt to new technologies,new products,new formats and new modes,and build a practical teaching mode of integration of production and teaching so as to create“Internet plus education”online“golden class”. The air traffic control intelligent learning platform system for new engineering is designed. The system adopts B / S（Browser /server）architecture system,which has the advantages of good expansibility,strong compatibility and low system maintenance cost| MySQL open source database is used in the background,which can realize data migration among multiple operating systems. Combined with the theoretical learning and practical training needs of controllers,four functional modules of student learning subsystem,teacher management subsystem,administrator subsystem and intelligent learning subsystem are designed. Through in-depth learning algorithm and cloud computing,accurate statistics and analysis of land and air call instructions are carried out,and the workload is calculated. Finally,the command level of controllers is compared with that of machine learning evaluation. The system enriches the training mode of control trainees,improves the training efficiency and lays the foundation for ensuring flight safety. 相似文献
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冷战后北约历经两次扩大.本文分析了新入盟国加入北约的原因和美国扩大北约的战略目的.中东欧国家加入北约有国家安全的历史原因,政治、经济发展的现实目的和集体认同;美国则强调在欧洲的军事存在和世界霸权.扩大后的北约性质是美国占主导地位的安全共同体.北约未来的走向取决于与俄国的关系,成员国内部以及成员国与美国的互动,北约在国际关系中的地位和作用. 相似文献
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SHIN Bong-cheol KIM Gun-hee CHOI Jin-hwa JEON Byung-cheol LEE Honghee CHO Myeong-woo HAN Jin-yong PARK Dong-sam 《浙江大学学报(A卷英文版)》2006,7(9):1467-1473
INTRODUCTION Recently, the application of the information technology into manufacturing fields gets more and more importance on the whole manufacturing shop floors. Currently, many researches reflect the effec- tiveness of knowledge-based production system re- lated to the exchange and management of various manufacturing information using information tech- nology via the Internet in order to increase the com- petitive power of industries. This research suggests a Web-based machining proce… 相似文献
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为保证无人机飞行试验的安全性,提升无人机飞控系统设计的可靠性,自主研发了无人机飞行控制半实物仿真系统。结合准确的无人机6自由度非线性数学模型和xPC实时系统模块模拟生成无人机飞行状态信息,根据地面站控制指令、传感器故障模注入指令解算获得不同飞行模式和飞行状态下的舵面偏转量,实现了实时系统闭环反馈控制,并驱动舵面偏转检验控制系统的响应速度。该系统不仅能验证飞控系统的逻辑性和实时性,而且借助虚拟现实技术和航迹地图显示,具备在线整定控制律参数的功能。该系统模块化程度高,相关硬件和软件对无人机平台和飞控计算机通用性广,依据多平台实验和多架次试飞的实验流程实用性强,为无人机飞控系统开发提供了切实可行、高效可靠的途径。 相似文献
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民航机务计算机辅助训练系统(CBT)是对机务人员进行培训的新型训练方式,民航机务CBT系统知识库用来为CBT课件开发人员提供全面准确的素材和学习资源。采用S1000D规范对机务维修信息进行模块化存储,实现知识库知识共享和交换。基于本体论建立CBT系统知识库检索机制,实现知识库信息的智能检索。 相似文献
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在NOVELL远程自举工作站上,用FORMAT及SYS命令制作系统盘存在不足,跨版本制作系统盘更是困难,本文提供几种简单可行的方法,解决了这些问题。 相似文献
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网络教育研究中的基本问题 总被引：8，自引：0，他引：8
武法提 《北京师范大学学报(社会科学版)》2006,1(2):17-22
网络教育是当前教育技术学研究的重要方向。网络教育理论研究中的三个基本问题是:网络教育中WEB(互联网)的教育技术学本质、媒体对学习的影响、网络学习环境中的学习控制。在网络教育中WEB在本质上是一种学习环境;媒体并不是学习效果的决定性因素,而媒体运用的方法和教与学过程中的媒体策略才是影响学习效果的因素;在网络学习环境中,完全的学习者控制是不适当的,应通过创设有效的认知支架,帮助学习者作出合理的学习决策。 相似文献
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Steven Hodge 《Critical Studies in Education》2016,57(2):143-159
Competency-based training (CBT) is a curriculum model employed in educational sectors, professions and industries around the world. A significant feature of the model is its permeability to control by interests outside education. In this article, a ‘Neoliberal’ version of CBT is described and analysed in the context of Australian Vocational Education and Training (VET). In this version of the model, a division of curriculum labour is instituted that, from the perspective of Neoliberal theory, allows the interests of educators to be limited in accordance with the belief that they will neglect the interests of students and other stakeholders if they have control over the whole curriculum construction process. But this version of CBT denigrates the expertise of educators by forcing them to set aside their own judgement about what is important to teach and implement a pre-existing picture of an occupation that may or may not be an effective representation. Empirical evidence is reviewed that suggests curriculum work in VET is indeed alienating for educators. Existing critiques of CBT are considered and found to have overlooked the specifically Neoliberal form of CBT in VET analysed in the article. 相似文献
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The Advanced Instructional Design Advisor is an Air Force project which involves the development and testing of automated instructional design guidance for use by Air Force technical training specialists in the development of computer-based training (CBT). This paper discusses the particular structure of an experimental instructional design advisor and how it has and will be used as a research platform to guide future efforts in automating instructional design. The experimental system described makes use of automated instructional strategies which can be systematically altered along a number of dimensions (e.g., amount of learner control, use of qualitative feedback during practice, etc.). Such a tool is essential to conduct research in this area, and has the added benefit of facilitating the rapid prototyping of CBT. 相似文献
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The authors describe a Web-based survey system developed for evaluating distributed learning at the University of Central Florida. Results from data collection, data validation, and survey results analyses are incorporated into a participation database table that restricts duplicate and unwanted responses. In addition, participants can validate and modify their responses before submission. A predetermined analysis design generates an immediate set of reports that can be modified according to user specifications. The authors then compare the pilot test results of this Web-based survey (summer 1999) to those of a traditional mailed survey. 相似文献
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近年来,利用网络学习社群学习受到越来越多网络学习者的欢迎。网络学习社群的成员分散在不同区域,藉由因特网相互沟通、学习并且完成群组工作,以达到学习的目的。本文介绍了网络学习社群的基本特点、使用注意事项,同时提出方案,解决网络学习社群中分享知识遇到的障碍。 相似文献
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在长期的作战实践中,美国空军提出了突然袭击、速战速决等一系列作战指导原则,这些原则在一定程度上反映了《孙子兵法》的一些思想。结合《孙子兵法》解读美国空军作战指导原则,总结其中符合孙子思想精髓的内容,试图从东方传统兵学的角度对美国空军作战指导原则加以诠释和分析。主要从四个方面加以分析:精确与即时的情报是空战胜利的重要因素;速战速决是作战成功的标准之一;突袭是制胜的重要途径;集中使用兵力对敌实施突击。 相似文献
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结合开放式实验室管理系统的建设,针对其设计与开发进行深入的研究。分析信息管理系统发展的现状和要求,探讨基于Web开发技术的开放式动态网站开发JSP和基于Windows NT平台的Web数据库开发技术。通过对主流的开发体系结构的比较,指出B/S(浏览器/服务器)模式的优势。采用三层B/S结构,设计开发了一个基于Web的开放式实验室管理的原型系统。 相似文献
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"新北约"与神圣同盟是两个不同时代的区域组织,也没有历史的亲缘关系,但二者的发展轨迹却惊人地相似,即二者都是强国争霸的产物,也是由代表旧制度国家战胜代表新制度国家的结果,二者在理论上都具有极大的虚伪性和反动性,在实践中又成为各自所处时代的国际宪兵组织.以史为鉴,从神圣同盟的演变过程可以预测,"新北约"由于其内部矛盾的不可调和,它的解体势在必然. 相似文献
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周琦 《湘潭师范学院学报(社会科学版)》2001,23(6):23-29
北约新战略和日美安保体制新定义是冷战后东西方安全格局中的重大事件;北约新战略只是美国全球战略的一个组成部分,即以建立以美国称霸世界为目标的单极世界战略的一部分;修改后的日美安全保障体制是美国欧亚地缘战略连环套体系中的一环,是美国主导下的在亚洲的“北约”：两对本地区乃至全球的国际关系都将带来巨大影响。 相似文献
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Sophie C. Alsem Anouk van Dijk Esmée E. Verhulp Tycho J. Dekkers Bram O. De Castro 《Child development》2023,94(6):e344-e361
This multicenter randomized controlled trial investigated whether interactive virtual reality enhanced effectiveness of Cognitive Behavioral Therapy (CBT) to reduce children's aggressive behavior problems. Boys with aggressive behavior problems (N = 115; Mage = 10.58, SD = 1.48; 95.7% born in Netherlands) were randomized into three groups: CBT with virtual reality, CBT with roleplays, or care-as-usual. Bayesian analyses showed that CBT with virtual reality more likely reduced aggressive behavior compared to care-as-usual for six of seven outcomes (ds 0.19–0.95), and compared to CBT with roleplays for four outcomes (ds 0.14–0.68). Moreover, compared to roleplays, virtual reality more likely enhanced children's emotional engagement, practice immersion, and treatment appreciation. Thus, virtual reality may be a promising tool to enhance CBT effectiveness for children with aggressive behavior problems. 相似文献