排序方式： 共有85条查询结果，搜索用时 15 毫秒
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CS战略--图书馆信息服务质量管理的核心 总被引：1，自引：0，他引：1
阐述信息服务质量管理中“顾客满意战略”（CS）的涵义和实现CS战略应该遵循的原则,并就如何实现图书馆信息服务质量管理CS战略的对策进行了探讨. 相似文献
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基于CS3000的分程控制系统的研究与应用 总被引：1，自引：0，他引：1
给出一种CENTU MC S3000集散控制系统中分离信号软件模块的分程控制方案。提出利用该模块的信号分配功能,可以产生一种新型分程控制模式,即不必调整阀门定位器的机电机构就能使送到两个控制阀的输入信号范围均为0％-100％。通过应用软件组态能够实现分程控制。这种方法具有工程实施省时省力、节省资金,控制效果更加准确可靠等优点,克服了传统分程控制参数调整不方便且稳定性较差等缺点。在石油化工企业的釜式间歇反应器温度分程控制和精馏塔塔压分程控制等系统中,有着广泛的应用前景。 相似文献
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Computer science is possibly one of the few remaining disciplines almost entirely dominated by men, especially university staff and in the hi-tech industries. This phenomenon prevails throughout the western world; in Israel it starts in high school, where only 30% of students who choose to take computer science as an elective are women, and continues in university and college, where usually less than 30% of the entire computer science student population is female. In this paper we present data describing women taking the undergraduate computer science program at the Open University of Israel. Covering a period of 10 years, we have examined the enrollment and results of thousands of students on 20 undergraduate computer science courses. An attempt has been made to identify whether there is a specific stage in the undergraduate program which is more difficult for women to pass. The good news is that within the Open University of Israel out of the entire population of computer science students the percentage of female enrolments and the percentage of females graduating is almost the same, and the differences in average final grade between men and women are generally not significant. This study is unique because of the large number of students which served as the study population, covering the entire undergraduate program. 相似文献
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采用CAN(Controller Area Network)构建汽车灯控制系统,基于英飞凌C167CS微控制器及智能功率器件设计了高端车用灯光控制模块,详细介绍其软、硬件的实现过程.该模块可实现对每个车灯的控制. 相似文献
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使用FLASH和XML相结合的技术,制作了一个实用的用于教学的随机点名工具。通过使用3DEnrivonment组件,使得此工具不仅能有炫目的3D动画效果,而且通过ActionScript脚本语言的使用,还使它具有强大的交互能力,大大活跃了教学气氛。 相似文献
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为提高船舶在复杂施工水域通行的安全性,提出一种基于Maklink图和布谷鸟搜索(cuckoo search, CS)算法的船舶路径规划方法。利用改进的Maklink图构建施工水域环境模型;设置变量参数并用改进的CS算法对模型进行求解,其中采用基于Dijkstra算法得到的最短路径长度作为种群个体的适应度值;采用3个衡量算法性能的指标——优化性能指标、时间性能指标和动态性能指标,对多种算法进行分析比较。结果表明,采用指数型自适应步长和线性自适应发现概率对CS算法进行改进,能提高其在路径规划中的搜索效率和迭代速度,并可以保证求出一定精度内的近似最优解,显示出该算法的优越性。 相似文献
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Predicting introductory programming performance: A multi-institutional multivariate study 总被引：1，自引：1，他引：0
A model for predicting student performance on introductory programming modules is presented. The model uses attributes identified in a study carried out at four third-level institutions in the Republic of Ireland. Four instruments were used to collect the data and over 25 attributes were examined. A data reduction technique was applied and a logistic regression model using 10-fold stratified cross validation was developed. The model used three attributes: Leaving Certificate Mathematics result (final mathematics examination at second level), number of hours playing computer games while taking the module and programming self-esteem. Prediction success was significant with 80% of students correctly classified. The model also works well on a per-institution level. A discussion on the implications of the model is provided and future work is outlined. 相似文献
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Helem Sabina Sánchez Damiano Rotondo Teresa Escobet Vicenç Puig Jordi Saludes Joseba Quevedo 《Journal of The Franklin Institute》2019,356(5):2798-2824
This paper proposes a frequency-based approach for the detection of replay attacks affecting cyber-physical systems (CPS). In particular, the method employs a sinusoidal signal with a time-varying frequency (authentication signal) into the closed-loop system and checks whether the time profile of the frequency components in the output signal are compatible with the authentication signal or not. In order to carry out this target, the couplings between inputs and outputs are eliminated using a dynamic decoupling technique based on vector fitting. In this way, a signature introduced on a specific input channel will affect only the output that is selected to be associated with that input, which is a property that can be exploited to determine which channels are being affected. A bank of band-pass filters is used to generate signals whose energies can be compared to reconstruct an estimation of the time-varying frequency profile. By matching the known frequency profile with its estimation, the detector can provide the information about whether a replay attack is being carried out or not. The design of the signal generator and the detector are thoroughly discussed, and an example based on a quadruple-tank process is used to show the application and effectiveness of the proposed method. 相似文献