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1.
Nazir Hawi 《美中教育评论》2010,7(9):47-57
The author has undergone a major shift in the way of teaching his undergraduate computer programming courses. In the classroom, the teacher＇s computer is connected to a splitter and a video projector that display the computer＇s screen to the entire class. Using this technology, the programming language itself is used live in class to help the students learn how to program. The students are learning in a context by far livelier than those of previous methods. Teaching computer programming is not achieved by lecturing and writing the program instructions on board or by displaying program instructions to the class on transparencies or slides of electronic presentations. With the implementation of student-centered approaches, the students migrated from the state of passive receivers to constructors of computer programming concepts. Students are coached to develop a sense of exploration, individuality and autonomous thinking. The enthusiasm for technology has been facilitating and supporting the learner-centered approach. Everyone in this approach is a learner, including the teacher. 相似文献
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郑玲 《重庆大学学报(英文版)》2003,2(2)
1. Introduction As is known, the function of a suspension system is to support an entire vehicle at axles so as to improve ride comfort by vibration absorption. It also provides handling stability in steering and acceleration as well as braking. However, the solution of the design contradiction between ride comfort and handling stability can抰 be achieved by passive suspension system elements. Some active suspension systems have been developed in order to handle the compromise, but they requi… 相似文献
3.
Mudasser F. Wyne 《美中教育评论》2010,(2):95-100
It is hard to define a single set of ethics that will cover an entire computer users community. In this paper, the issue is addressed in reference to code of ethics implemented by various professionals, institutes and organizations. The paper presents a higher level model using hierarchical approach. The code developed using this approach could be adopted easily by the entire community of computer users working in different environments. The hierarchical approach allows refinement and customization of code at lower levels to address the needs of diverse sub groups of users. It also provides comfort of flexibility as well as the potential for evolution. The work reported here is in continuation of the research reported in an earlier paper （Wyne,2009）. 相似文献
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Traffic monitoring is of major importance for enforcing traffic management policies. To accomplish this task, the detection of vehicle can be achieved by exploiting image analysis techniques. In this paper, a solution is presented to obtain various traffic parameters through vehicular video detection system( VVDS). VVDS exploits the algorithm based on virtual loops to detect moving vehicle in real time. This algorithm uses the background differencing method, and vehicles can be detected through luminance difference of pixels between background image and current image. Furthermore a novel technology named as spatio-temporal image sequences analysis is applied to background differencing to improve detection accuracy. Then a hardware implementation of a digital signal processing (DSP) based board is described in detail and the board can simultaneously process fourchannel video from different cameras. The benefit of usage of DSP is that images of a roadway can be processed at frame rate due to DSP‘s high performance. In the end, VVDS is tested on realworld scenes and experiment results show that the system is both fast and robust to the surveillance of transportation. 相似文献
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Omnidirectional imaging sensors have been used in more and more applications when a very large field of view is required. In this paper, we investigate the unwrapping, epipolar geometry and stereo rectification issues for omnidirectional vision when the particular mirror model and the camera parameters are unknown in priori. First, the omnidirectional camera is calibrated under the Taylor model, and the parameters related to this model are obtained. In order to make the classical computer vision algorithms of conventional perspective cameras applicable, the ring omnidirectional image is unwrapped into two kinds of panoramas： cylinder and cuboid. Then the epipolar geometry of arbitrary camera configuration is analyzed and the essential matrix is deduced with its properties being indicated for ring images. After that, a simple stereo rectification method based on the essential matrix and the conformal mapping is proposed. Simulations and real data experimental results illustrate that our methods are effective for the omnidirectional camera under the constraint of a single view point. 相似文献
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In developing distributed systems, conformance testing is required to determine whether an implementation under test （IUT） conforms to its specification. With distributed test architectures involving multiple remote testers, testing approaches may become more complicated because of issues known as controllability and observability problems. Based on a finite state machine （FSM） representation of the system＇s specification, this paper proposes a new method to generate a test sequence utilizing multiple UIO sequences. The method is essentially guided by the way of minimizing the use of external coordination messages and input/output operations. Experiments are given to evaluate the proposed method. 相似文献
7.
Menekse Seden TAPAN Cigdem ARSLAN 《美中教育评论》2009,6(3):54-60
The main purpose of this research is to elements and mathematical properties when they are axiomatic structure of the Euclidian geometry forms a determine to what extent preservice teachers use visual dealing with a geometrical construction activity. The coherent field of objects and relations of a theoretical nature; and thus it constitutes a favorable ground for the learning of the reasoning and justification. In geometry, even if the reasoning is assisted by concrete elements such as drawings, it is not based on actions or spatio-visual elements. Arguments based on mathematical properties are required in geometrical reasoning. A successful teaching of the geometry directly depends on the subject knowledge of the teachers. Another purpose is to map out the different kinds of justifications implemented by teachers related to such an activity. Analyses of the responses indicate that a large proportion of preservice teachers use visual elements for their geometrical constructions and they are tended to use naive empiricism concerning their justifications. 相似文献
8.
The problem of computing a piecewise linear approximation to a surface from its sample has been a focus of research in geometry modeling and graphics due to its widespread applications in computer aided design. In this paper, we give a new algorithm, to be called offset surface filtering （OSF） algorithm, which computes a piecewise-linear approximation of a smooth surface from a finite set of cloud points. The algorithm has two main stages. First, the surface normal on every point is estimated by the least squares best fitting plane method. Second, we construct a restricted Delaunay triangulation, which is a tubular neighborhood of the surface defined by two offset surfaces. The algorithm is simple and robust. We describe an implementation of it and show example outputs. 相似文献
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V. B. Saputra S. K. Ong A. Y. C. Nee 《上海大学学报(英文版)》2014,(3):222-230
This paper presents a calibration method for parallel manipulators using a measurement system specially installed on an external fixed frame. The external fixed frame is important as an error reference for calibration in certain operations, such as in the configuration of a parallel manip- ulator functioning as a machine tool where the workpiece is fixed to a worktable. The pose of the end-effector is mea- sured using three digital indicators installed on the external fixed frame. To enable measurement, the end-effector is assumed to be a plane large enough that all digital indicators could touch. The error is defined as the difference between the theoretical and actual readings of the digital indicators. The geometric parameters of the parallel manipulator are optimized to minimize this error. This calibration method is low cost and feasible for compensating geometric parameter errors for a parallel manipulator. Optimal pose selection for the calibration is achieved using a swarm intelligence search algorithm. The method is implemented on a prototype of a six degrees-of-freedom （DOFs） Gough-Stewart platform constructed to function as a machine tool. 相似文献
10.
This paper introduces a set of services for the creation of on-line surveys, questionnaires, exams and self-assessment tests within a virtual community system used in e-learning settings. The system, called ＂Online Communities＂, is a dynamic web application used as platform for blended learning activities by the Faculty of Economics of the University of Trento. The functionalities added to the platform are contextualized into virtual communities, where activities take place. This allows us to create, submit and analyze questionnaires within and/or outside the boundaries of a community. Furthermore, the system allows to manage libraries of queries organized by the teacher/administrator of the community according to topics and levels of difficulty, in order to produce tests and generate self-assessment sessions on behalf of students. The addition of a questionnaire/ poll/self-assessment tool to a virtual community system can add a lot of interesting features, mainly using the inheritance mechanism implemented among different hierarchically-connected communities. This paper will present these functionalities and highlight one of these services, precisely the one dedicated to self-assessment. In the system, self-assessment tests have indeed a double nature： （1） They are useful to students for checking their own level of preparation; and （2） They are useful to lecturers as an indicator of the level of preparation reached by the students. In order to encourage the use of the system within the whole educational process, and not to limit the real use of the service to the period of the final exams only, the possibility has been foreseen for each participant to share his/her own test results, comparing them with the other members of the community, and even offering real ＂challenges＂, thus transforming passive and ＂solitary＂ learning into something much more stimulating and ＂social＂. 相似文献
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双目定位跟踪系统涉及到的关键技术有摄像机标定、立体匹配和三维重建等.在三维重建阶段,利用匹配的结果采用最小二乘法计算定位标靶上标记的三维坐标.实验结果表明,在现有条件下,双目定位跟踪系统的定位精度比较高,相对误差在1%以内;基于此定位跟踪系统,能够初步准确完成对经络的三维定位和实时显示,为临床诊断治疗和基础教学提供直观的分析依据. 相似文献
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立体显示技术是未来信息显示系统的发展方向之一,本文对立体显示技术做了简要介绍,并给出如何利用目前个人PC机的主流显卡Nvdia的显示驱动实现立体显示的方法。通过利用立体眼镜以及我们自行研制的立体显示器测试表明目前在利用立体三维显示技术改进和提高多媒体装备和多媒体教学质量的方案中,采用Nvidia显卡进行实现是最为简便、成本最低的最佳方式之一。 相似文献
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通过对多媒体教学中常用的LCD和DLP以及新投入市场的LED激光混合光源投影机的光源、分光系统、显示器件分析、对比和研究,得出三种投影机在投影图像显示效果及投影机性能方面的差异,为用户选购投影机提供参考。 相似文献
15.
一种简单实用的LCD数显温度计 总被引：3，自引：0，他引：3
文章介绍了一种基于半导体集成温度传感器和液晶显示器的数字温度计。对笔段式液晶显示器的驱动与使用进行了介绍,并对该温度计的电路构成、工作原理、校准方法等也作了详细分析。 相似文献
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提出一种供配电计算机模拟演示系统，通过设计系统的硬件和软件，给出演示功能和监控功能的实现方法，并说明了系统的特点。 相似文献
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采用GS2217单片数字立体声调频收音芯片与微控制器MSP430F149,并结合实时时钟、LCD显示、环境温度采集技术,实现多功能数字调频收音机.详细阐述了系统设计原理与软硬件的实现方法.该收音机具有自动搜台、频段存储、频率显示、静音、立体声输出与环境温度实时采集、显示等功能. 相似文献
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介绍了信息显示与光电技术产业发展和人才需求现状,从课程建设、师资条件建设、教学条件建设三方面阐述了信息显示与光电技术特色专业建设,建立了以平板显示器件为核心,覆盖材料、系统的课程体系、师资力量和教材体系以及以平板显示器件工艺为核心实验平台的实验教学体系。 相似文献
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针对智能停车库中的泊车机器人视觉系统研究需求,提出一种基于双目视觉的泊车机器人障碍物识别系统。通过双目摄像头进行图像采集,利用张正友棋盘标定法进行双目相机标定;采用Bouguet进行立体校正,将高斯滤波与拉普拉斯算子相结合进行图像预处理;采用YOLO卷积神经网络对目标障碍物进行快速识别;利用区域匹配算法进行立体匹配并生成目标障碍物视差图;通过成像点和目标障碍物的立体几何关系计算得到目标障碍物的深度信息。实验结果表明,该系统具有良好的实时性和较高精度,障碍物识别时间平均为0.0901s,在2 600mm具有最佳测距精度,可为泊车机器人自动泊车提供保障。 相似文献