首页 | 官方网站   微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 140 毫秒
1.
梁振英  王朝立  陈华  李彩虹 《自动化学报》2016,42(10):1595-1604
研究了不确定非完整移动机器人系统的跟踪问题.首先,基于视觉反馈和状态输入变换,展示了一种非完整移动机器人运动学系统的不确定链式模型.基于反步法思想和跟踪误差系统结构,给出了两个重要的新变换.然后运用李雅普诺夫直接方法和扩展巴巴拉引理设计了自适应控制律和动态反馈鲁棒控制器,以实现理想轨迹的跟踪控制.严格证明了闭环误差系统的渐近收敛性.最后,仿真结果证实了提出的控制策略有效.  相似文献   

2.
刘勇奎  李笑牛  云健 《计算机工程与设计》2007,28(23):5680-5681,5794
提出了一种三维物体表面的逼近表示与数据压缩方法.该方法可以在不增加表示物体表面的数据量(例如面片数量)的情况下,使逼近误差降低约1/2;在逼近误差不变的情况下,使表示物体表面的数据量大幅下降.提出了用与最基本的三维物体--球体表面相交的面片来表示球面的方法,将该方法扩展到了一般曲面.理论分析与实验数据表明,新算法与传统方法相比,其数据压缩比约为35%.该研究在虚拟现实技术和三维模型的数据压缩及传输等领域有较重要的学术及应用价值.  相似文献   

3.
在OSGi服务平台中,服务的注销会使和该服务相关联的ServiceReference引用和服务引用过时,过时的ServiceReference引用和服务引用会带来许多问题.但服务什么时候被注销,无法预先知道,且无普遍实用的判定ServiceReference引用和服务引用是否过时的算法.本文通过对OSGi服务平台核心事件的产生和投递过程深入细致的分析,提出了判定ServiceReference引用和服务引用是否过时的方案.  相似文献   

4.
研究了如何在Windows与Linux这两种最流行的操作系统之间进行互操作:在单机情况下,共存于同一机器的Windows与Linux如何互访文件系统,利用模拟器软件运行各操作系统下的应用程序;在网络情况下,运行不同操作系统的计算机如何共享文件与打印机;如何利用虚拟机软件运行另一操作系统下的应用程序.并简要分析比较了所用到的软件工具的机理及安装与使用方法.  相似文献   

5.
《数码世界》2008,7(11)
本刊讯 北京时间5月12日14时28分,四川阿坝州汶川县(北纬31度,东经103.4度)发生了8.0级地震.本次地震具有强度大、影响面广、破坏严重等特点,强烈的地震造成灾区道路受阻、电力中断、通信线路和设施损毁,致使四川、甘肃、重庆、陕西等省(市)部分地区的通信不同程度的受损.  相似文献   

6.
紧随SolidWorks公司2005年用户大会,老牌SolidWorks代理商智诚科技也于2005年7月在香港、广州和深圳召开了年度用户大会.本次盛会吸引了近200名来自深圳、东莞、惠州及香港等地的工程师参加,智诚科技及其合作伙伴在会上除向与会嘉宾介绍MoldOffice、3DQuickPress和SolidCAM外,还隆重推介了SolidWorks 2006和COSMOS 2006.记者亲历本次深圳盛会,并在参会期间,同智诚科技有限公司总经理Kelvin Chong荘敏先生及其合作伙伴、用户进行了深入交流,从不同侧面了解他们对SolidWorks及智诚科技的看法.  相似文献   

7.
如何设计一款能够通过网络实现远程拍照和浏览照片的IPCamera?本文通过采用ARM9和USB摄像头实现IPCamera.IPCamera使用S3C2410、AX88796等元件来组成硬件平台,再将Linux系统移植到硬件平台上,然后设计好相应的驱动程序和应用程序,最后将软件下栽到硬件平台.  相似文献   

8.
很多用户都选择了Windwos XP和Windows Vista组成双系统,这样的方式一来可以很好地体验Vista,二来也可以随时切换到XP系统下完成Vista系统下"不可能完成的任务". 笔者就是遵循了上述想法安装了双系统,可是在格式化Vista所在分区重启机器时出现了一个问题(如图1).我明明在格式化后将C盘(XP所在分区)根目录下的"boot.ini"文件做了修改,为什么还会出现这样的情况呢?  相似文献   

9.
VoIP技术已经广泛应用于企业级的语音业务,但是为了安全性和节省IP地址的使用,目前大量的企业和局域网都采用Firewall/NAT技术连接到Internet.比较了传统的Firewall/NAT的穿越方案,并介绍和比较了较新的ICE和VPN穿越方式,描述了各种穿越方法的穿越机制,分析了各种方法的优缺点,并作了横向比较.  相似文献   

10.
计费系统的模型是计费系统的核心组成部分,计费系统模型的性能直接影响到计费系统的性能.本文针对现有计费系统模型的弊端,提出一个新的模型.经实验证明此新的模型支持新的费率,支持扩展,而且更加的灵活,更加的稳定,并且具有一定的通用性.  相似文献   

11.
智能科学与技术专业创新实践体系的构建   总被引:1,自引:1,他引:0  
在实验室与创新实践基地建设的基础上,提出以课程实验教学为基础,以课程设计与毕业设计为核心,以校外实习为补充的课内实践教学体系和以实验室课外开放项目培训为基本内容,以学科竞赛为动力支撑与效果检验,以参与教师科研与学生自主科技创新为补充的课外实践教学体系。强调课外创新实践教学的地位和作用,重点介绍实验室课外开放项目设计方案和课外创新实践活动开展的经验与体会。实践表明,创新实践体系的构建激发了学生学习兴趣,培养了学生的创新实践能力,有利于提高人才培养质量。  相似文献   

12.
This paper examines the possible effects of labour market institutional characteristics on young people's perceptions of their internship experiences as expressed on Twitter. By looking at these opinions (satisfaction versus dissatisfaction) in relation to certain features of internships as well as to the more general labour market regulatory framework, this project aims to give a voice to young people, enabling them (indirectly) to provide policy suggestions to law-makers. Furthermore, we propose a preview of a possible empirical model for data collection based on the manual coding of Tweets. By employing a Probit regression and Blinder–Oaxaca and Fairlie decompositions, we have tried to establish a link between the perceived evaluation of internships and the country where the internship is based, the latter being used as a proxy for the legal system. In all our tests we found that the country in which the internship is placed is the main factor in the positive or negative perception. We also find that the more difficult is to hire a young worker on a temporary basis the lower will be his valuation of the internship experience. Ultimately we propose the use of Twitter not only as a relevant research tool, but also as an instrument for bringing young people's needs to the attention of law-makers.  相似文献   

13.
14.
To apply final as-built BIM models to facility management (FM) during the operation phase, it is important for owners to obtain an accurate, final as-built model from the general contractors (GCs) following project closeout. Confirming the accuracy of the final as-built BIM model is one of the most important works executed by owners to meet the accuracy requirement of final as-built models for FM. However, many practical problems arise relating to the management of final as-built models such as final as-built model mismatch, the lack of available final as-built models, and the entry of incorrect non-geometric information into the final as-built models. To solve these practical problems, this study develops a Final As-built BIM Model Management (FABMM) system for owners to handle final as-built BIM model inspection, modification, and confirmation (BMIMC) work beyond project closeout. The proposed approach and system can be used to manage the status and results of BMIMC management work for the final as-built BIM model to be performed. The proposed approach and system were applied in a case study in a selected building in Taiwan to verify and demonstrate its practical effectiveness. This study identifies the benefits, limitations, and conclusions of the FABMM system, and presents suggestions for its further application.  相似文献   

15.
为了提高高等职业院校学生的专业实践能力,各高校十分重视学生的实践能力培养。在“互联网+”的推动下,构建基于“互联网+”的学生顶岗实习管理系统,能加强对整个顶岗实习工作过程进行科学管理,对学生的顶岗实习各项数据的收集、统计与分析等工作将更加规范、科学,更好地保障学生顶岗实习的效果和质量。  相似文献   

16.
针对高职工学结合过程中存在的诸多问题,应用ASP.NET及数据库技术,设计了B/S结构的高职工学结合实习管理系统,实现了工学结合实习信息的计算机网络化管理和信息共享。为学校、企业、学生三方的合作交流提供了平台,使实习信息的采集、管理、共享规范化和现代化。  相似文献   

17.
This paper reports the results of a study of the extent to which processes and procedures from the discipline of project management can scaffold online project-based learning in a graduate-level instructional technology course, by facilitating intra-team interaction, enhancing project outcomes and promoting a positive project team experience. With one course section using tools and templates from project management and one section using only free-form text forms and instructor guidelines as project scaffolding tools, team interactions were compared via qualitative and quantitative analyses of team threaded discussions over an 8-week project lifecycle. Project outcomes were assessed by comparing project product scores using the t-test for independent samples, while project experience was assessed via a post-project survey using the University of Wisconsin-Madison Student Assessment of Learning Gains (SALG) questionnaire. Results indicate that the project management methodology facilitates intra-team communication and positive collaborative behavior, but is not a critical factor for final product quality. The results provide a starting point for educators and researchers seeking to assess cross-disciplinary approaches to project-based learning.  相似文献   

18.
In order to solve the problem of insufficient integration of school-enterprise supervisors in the current school-enterprise cooperation model, this article introduces the ideas and results of the construction of a team with double-qualified instructors majored in software engineering. Specifically, the integration of production and education are carried out in three stages, i.e., enterprise cooperation courses, enterprise internship, and graduation design (internship), by taking the software engineering major of the School of Information and Software Engineering of the University of Electronic Science and Technology of China as a case study.  相似文献   

19.
本文通过对软件工程课程实践的关键核心任务进行分析和提炼,提出了一个面向软件工程课程实践的学生项目管理平台。该平台有效地实现了教学管理和学生项目过程管理的无缝集成,实现了从教务人员下达课程任务,到组织指导教师,创建学生项目组,项目开发过程控制,再到项目的中期检查、验收和答辩,到最终的成绩汇总和质量评价的一个完整的软件工程实践课程的全生命周期管理。  相似文献   

20.
Blogging has been recommended as a suitable tool for learning during internship due to its associated usefulness in collaborative learning, reflection, communication, and social support. In this study, blogging was incorporated into the internship activities of two discipline-specific groups of interns: information management (n = 53) and nursing (n = 28). In examining the behavior, perceptions and processes of blogging among interns from the two disciplines, a mixed-methods design was used to obtain quantitative and qualitative data through structured interviews and blogging entries. Results revealed that the interns engaged regularly in the writing and reading of their own blogs, and commented on others’ blog-writing. The interns perceived blogs to be useful during internship in providing an avenue for knowledge construction, problem solving, reflection, and communicating their emotions. Positive perceptions were not influenced by discipline background, frequency of use, or blogging platform. Qualitative analyses of blog contents indicated that the students engaged in cognitive, metacognitive-reflective, affective, and social-collaborative learning processes in blogging. Higher engagement was found in cognitive and metacognitive processes. Responses to open-ended probes suggest that pedagogical factors (e.g., grading system, supervision) may also have influenced students’ blogging behaviors and perceptions. Overall, this study offers evidence to support the use of blogging during internship as computer-based support for learning.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号