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随着计算机技术和电子技术的迅速发展,Protel 2004软件已经成为电路设计、印制电路板设计中至关重要工具。制作PCB印制电路板的基础内容是电路原理图的设计,它主要包括元器件的选择、布局和连线;核心内容是通过软件将原理图中电路的连线完整表现在电路板设计中。 相似文献
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本文在简要分析了4种Windows2000Professional安装方法的利弊之后,提出了使用Sysprep制作没有SID和计算机名的通用母盘问题,并根据作者的实践经验,叙述了制作没有SID和计算机名的通用母盘的一般性操作步骤和制作中的注意事项,从而实现Windows2000的快速部署。 相似文献
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光探测器是光纤通信系统的重要组成部分。金属-半导体-金属光电探测器(metal-semicondctor-metal photodetector,MSMPD)具有寄生电容低,响应波长可覆盖光通信1300-1550nm的低损耗窗口波段等优点。在制作工艺方面,MSM-PD结构简单,易于制作,从晶体生长到器件制作的整个过程与FET兼容。因此,MSM-PD已成为光电子集成电路、高速光纤通信系统的高响应光电器件领域的重要研究对象。简要介绍了MSM光探测器的技术概况,分析了MSM-PD的基本原理和性能参数,并论述了MSM探测器的发展趋势。 相似文献
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简述了Authorw are5.0在开发《普通化学习题》多媒体课件中的应用及课件特点,为化学多媒体教学软件的制作提供参考。 相似文献
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随着信息时代的发展,网站建设已经越来越多的走入了我们的校园,我们的每一们课程都可以在Internet上创建自己的网站。网站的设计,日益被网站建设者所注重。本文以实际经验为依据,比较详细地论述了教学网站的组织结构、制作过程、技术要点,包括立题、结构、素材的搜集、多媒体制作和网页的制作等内容。 相似文献
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三相三线制作为高压输电线路中最重要的接线方式,其在社会生活中的作用不言而喻。而三相三线的接线方式对接线的准确性有着较高的要求,假使接线错误会对电网的正常运行产生极大的影响。本文就三相三线电能表的错误接线方式进行简要分析,以其能够对三相三线方式连线方式可能出现的错误提出警醒。 相似文献
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观察和研究了２５０ 例喙突与剑胸结合中点连线上喙突下臂丛神经阻滞麻醉。方法,测量喙突、剑胸结合中点两点连线长度,带入回归方程ｙ＝ ０．１６ｘ－ ０．９（ｘ：喙剑连线长度,ｙ：喙突到腋腔神经血管鞘中线在体表投影距离）。依此距离在喙剑线上确定穿刺点。成功率９４％ 。结论,喙剑连线喙突下臂丛神经阻滞是一个比较简单易行安全可靠的臂丛神经阻滞的途径。 相似文献
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信号与系统课程是电子信息类专业的核心基础课程,在各种经典教材中都采用冲激响应匹配法求解微分方程零时刻的跳变值。本文分析了冲激响应匹配法求解跳变问题存在的问题,提出了一种应用laplace变换求解跳变问题的新方法,简述了此种方法的原理和求解过程。多年的教学经验表明这种方法更简单,更易让学生掌握。 相似文献
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多目标遗传算法NSGA—Ⅱ是解决0／1背包问题^[1]的有效算法,但是它还存在一定的缺陷,当0／1背包问题的规模较大时,这种方法很难收敛到Pareto最优边界,因此解的分布性不是很好,解集也很难收敛。针对此问题,提出基于ε支配的MOGA来求解0／1背包问题,通过实验验证该算法在求解分布性上优于NSGA-Ⅱ。 相似文献
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The aim of this paper is the development of a general class of input shapers with distributed time delay which leads to retarded spectral properties. The design of the shaper is formulated as a multi-objective optimization problem, where response time and robustness, expressed in terms of residual vibrations, are the main objectives. As a part of the optimization formulation, common requirements for input shapers such as non-decreasing step response and unity steady state gain are considered in the design. Moreover, additional optional requirements, such as smoothness of a step response, jerk and even jounce limits can be added to optimization procedure. The resulting problem can be solved using convex optimization techniques. Several illustrative examples are presented in comparison with classical input shaping techniques. Finally, implementation aspects are discussed. The paper is accompanied by an implementation in MATLAB, including a user-friendly interface for the interactive shaper design. 相似文献
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目前高职教育在人才培养上存在如学生基础较差、人文素质较低、实践性环节实施不到位等问题。在教学上往往缺少高职教育的特点,使得教学与社会脱轨。针对这些问题应当加强基础教育、重视人文素质提高、改革课程设置、以实践性环节为主导来解决问题。 相似文献
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Haifeng Sun Daixuan Cheng Jingyu Wang Qi Qi Jianxin Liao 《Information processing & management》2021,58(5):102605
Controllable response generation is an attractive and valuable task to the success of conversational systems. However, controlling both pattern and content of the response has not been well studied in existing models since they are mainly based on matching mechanisms. To tackle the problem, we first design a pattern model to automatically learn and extract speech patterns from words. The pattern is then integrated into the encoder–decoder model to control the response pattern. Second, a sentence sampling algorithm is built to directly insert or delete words in the generated response, so that the content is controlled. In this two-stage framework, the response could be explicitly controlled by the pattern and content, without any human annotation of the post-response dataset. Experiments show the proposed framework achieves better performance in response controllability than the state-of-the-art. 相似文献
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The past few years have witnessed an explosive popularity of mobile services, especially in the form of smart phone applications. To cope with the limited batteries and computational capacities of mobile devices, prior studies suggest to deploy service instances in clouds for accomplishing most of the computation-intensive tasks. Service composition, which compensates for the simplicity of single service, is an effective way to utilize the plentiful services on the clouds all over the world. In this paper, we focus on the problem of service instance selection with service instance replica limitation constraint. The objective is to select the optimal set of service instances, which composes the integrated service and brings out the optimal QoS (quality of service), in terms of service response time. To characterize the problem, we establish a new QoS model, which considers the comprehensive quality over all users, not just for any single user or service instance. We prove that the problem is NP-hard, since many functionally equivalent service instances spread all over the distributed clouds. To address the problem, we classify the problem into three cases, including two special cases and the general case. We present two effective heuristic algorithms to determine the service instances selection for the two special cases, which are still NP-hard. The two special cases provide empirical bounds for the general case. We propose an algorithm that simulates a vote procedure for the users in the general case. The selected service instances, which come from the vote procedure, can satisfy a majority of users. We conduct extensive simulations for all of the algorithms. The simulation results show that our algorithms work efficiently on service response time reduction. 相似文献
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A novel recommendation method based on social network using matrix factorization technique 总被引：1，自引：1，他引：0
Chonghuan Xu 《Information processing & management》2018,54(3):463-474
The rapid development of information technology and the fast growth of Internet have facilitated an explosion of information which has accentuated the information overload problem. Recommender systems have emerged in response to this problem and helped users to find their interesting contents. With increasingly complicated social context, how to fulfill personalized needs better has become a new trend in personalized recommendation service studies. In order to alleviate the sparsity problem of recommender systems meanwhile increase their accuracy and diversity in complex contexts, we propose a novel recommendation method based on social network using matrix factorization technique. In this method, we cluster users and consider a variety of complex factors. The simulation results on two benchmark data sets and a real data set show that our method achieves superior performance to existing methods. 相似文献
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加快信息化建设 提高科研管理水平 总被引：3，自引：0，他引：3
为了在新的形势下提高高校科研管理水平,分析了信息化工作在科研管理工作中的重要性以及存在的问题,并针对这些问题从管理制度、资源整合、扩展应用、队伍建设等方面提出了一系列的解决方案推进信息化建设的进程。 相似文献
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配送车辆优化调度问题是物流系统中的一个重要环节,本软件借助VB语言,在分析静态配送的基础上,针对不断变化的市场需求,建立动态的物流配送模型,在生成路网的平台上,通过研究物流配送货物过程中路径、车辆选择的问题,提出对物流配送最优路径的动态选择方案,提高物流配送效率,满足客户需求,更符合实际。 相似文献