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1.
《Journal of The Franklin Institute》2022,359(17):10120-10144
In this paper, a Fault Detection and Isolation (FDI) system based on an ensemble-based hierarchical classifier is devised to detect and isolate twelve typical turbine faulty scenarios and a healthy scenario. The hierarchical classifier is designed based on eight studied classifiers' best-practice confusion patterns, ranging from classical to state-of-the-art methods. The proposed hierarchical classifier discriminates five faulty classes with almost perfect accuracy while increasing the accuracy of healthy scenario discrimination by 10%, which is particularly important since it significantly reduces the false alarm rate for any form of fault. The overall accuracy of classification is improved by 2%, as well. Along with the classifier, an appropriate notion of confidence rate helps evaluate the classifier's decisions, especially when unlabeled data are involved. This motivation leads to devising a confidence rate concept that suits the devised classifier well. The obtained results show that the introduced confidence rate changes monotonically with classification accuracy. In the case of the high confidence rate of unlabeled data, this property is utilized to label the data with high accuracy. The proposed confidence rate is particularly effective in decision-making in the labeling of challenging mixed-up scenarios. Obtained results show that the classifier's decisions are reliable, with a confidence rate greater than 0.7. The developed FDI system is examined with simulated and real data, where obtained results verify the satisfactory performance of the system. 相似文献
2.
In this paper, a robust actuator fault diagnosis scheme is investigated for satellite attitude control systems subject to model uncertainties, space disturbance torques and gyro drifts. A nonlinear unknown input observer is designed to detect the occurrence of any actuator fault. Subsequently, a bank of adaptive unknown input observers activated by the detection results are designed to isolate which actuator is faulty and then estimate of the fault parameter. Fault isolation is achieved based on the well known generalized observer strategy. The simulation on a closed-loop satellite control system with time-varying or constant actuator faults in the form of additive and multiplicative unknown dynamics demonstrates the effectiveness of the proposed robust fault diagnosis strategy. 相似文献
3.
软件复用技术是在软件开发过程中避免重复劳动的解决方案。从软件复用技术的概念出发,提出了过程复用的总体框架,描述了演化过程构件的基本算法,提出了复用模型在系统开发中的步骤。 相似文献
4.
分析了软件工程专业课程体系设置的现状、开源软件的优势以及社会对开源软件人才的需求,提出了建设基于开源技术的软件工程课程体系的思路,并在教学实践中进行了课程改革探索。 相似文献
5.
在人事、财务及图书情报等部门的办公自动化管理中,统计出数据库中某项内容占某项数据总数百分比,以得到Word数据统计报表是经常遇到的。这样的制表工作一般都较为烦琐,既要制表,还要计算并填写数据。本文就高效解决这类问题,提出了一种思路,介绍了一种利用Excel工具来高效快速计算并生成含百分比数据项Word统计表的方法和技巧。 相似文献
6.
本文要介绍MIS软件开发过程中 ,通过截尾寿命测试所采集到的软件故障数据 ,应用可靠性统计的方法 ,对寿命服从Weibull分布的MIS软件 ,建立最大似然方程的参数迭代法 ,确定可靠性指标 ,并以实例计算验证。 相似文献
7.
软件工程是软件工程专业重要的基础理论课,随着卓越工程师计划的推进,如何提高软件工程课程教学质量成为越来越重要的问题。本文结合软件工程课程的特点,提出以团队为单位,学生为主体,基于项目驱动的教学方法。该方法在教学实践过程中取得较好的效果,对其他基础理论课程的教学具有一定的参考价值。 相似文献
8.
Matheus A. Marins Felipe M.L. Ribeiro Sergio L. Netto Eduardo A.B. da Silva 《Journal of The Franklin Institute》2018,355(4):1913-1930
Similarity-based modeling (SBM) is a technique whereby the normal operation of a system is modeled in order to detect faults by analyzing their similarity to the normal system states. First proposed around two decades ago, SBM has been successfully used for fault detection in varied systems. In spite of this success, there is not much study performed in the literature regarding its design, that encompasses both similarity metrics and model training. This work aims at contributing with an in-depth study of SBM for fault detection considering these two design aspects. This is done in the context of proposing a novel system to identify rotating-machinery faults based on SBM, that is employed either as a standalone classifier or to generate features for a random forest classifier. New approaches for training the model and new similarity metrics are investigated. Experimental results are shown for the recently developed Machinery Fault Database (MaFaulDa) that has an extensive set of sequences and fault types, and for the Case Western Reserve University (CWRU) bearing database. Results for both databases indicate that the proposed techniques increase the generalization power of the similarity model and of the associated classifier, achieving accuracies of 98.5% on MaFaulDa and 98.9% on CWRU database. 相似文献
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10.
This study evaluates the effect of conversion between tacit and explicit knowledge, and its influence on Software engineering and Software Process Improvement in the context of a small school software company in which undergraduate students participate as personnel. A survey measurement instrument was applied to the last three generations of students. The effect was measured from an interaction of the four modes of the SECI model knowledge conversion using regression analysis associated with four hypotheses study. The findings show that students are able to generate tacit and explicit knowledge in a similar way to software organizations. This study is considered a contribution of both academia and software industry that encourages this type of experiences in undergraduate students and prepares them as intellectual capital with an organizational culture that shares knowledge. 相似文献
11.
南京作为全国第一个“中国软件名城”,软件人才是软件产业持续发展的动力和源泉。本文从南京市三级软件人才培养体系的现状出发,分析其目前存在的规模性失衡、结构性失衡和品质性失衡,在此基础上提出进一步优化南京软件人才培养体系的对策与建议。 相似文献
12.
Model-based fault detection and isolation (FDI) requires an analytical system model from which fault indicators can be derived by assigning proper computational causalities. Many bond graph (BG) model-based techniques for FDI have been developed in recent past. Furthermore, many other advances have been made in the field of control engineering applications of BG modelling. Supervision systems not only perform FDI, but also take the necessary steps for fault accommodation. Fault accommodation is done either through system reconfiguration or through fault tolerant control (FTC). In this paper, it is shown that bicausal BG modelling proves to be a unified approach for sensor placement from the FDI and FTC viewpoint, identification of hardware redundancies for system reconfiguration, generation of fault indicators, estimation of fault parameters for fault accommodation, inversion of systems and actuator sizing for FTC, etc. It is shown that the use of bicausalled BG helps to integrate many of the recently developed advances made in the field of control engineering into development of complex supervision systems. 相似文献
13.
江苏省卓越工程师（软件类）教育培养计划的启动,构建了又一个校企联合培养软件类人才的平台,我校通信工程、软件工程两个专业被遴选为卓越工程师（软件类）教育培养计划试点专业。以此为契机,对“卓越工程师（软件类）”校企合作教育培养模式进行了探析。实践证明,在卓越工程师（软件类）的教育培养过程中,采取校企合作教育培养模式切实可行。 相似文献
14.
《Journal of The Franklin Institute》2022,359(13):7115-7139
Fault detection and diagnosis is crucial in recent industry sector to ensure safety and reliability, and improve the overall equipment efficiency. Moreover, fault detection and diagnosis based on k-nearest neighbor rule (FDD-kNN) has been effectively applied in industrial processes with characteristics such as multi-mode, non-linearity, and non-Gaussian distributed data. The main challenge associated with FDD-kNN is the on-line computational complexity and storage space that are needed for searching neighbors. To deal with these issues, this paper proposes a monitoring approach where the Fuzzy C-Means clustering technique is used to decrease the overall on-line computations and required storage by measuring the neighbors of the clusters’ centres rather than the raw data. After building the monitoring model off-line based on the data clusters’ centres, the faults are detected by comparing the average squared Euclidean distance between the on-line data sample and the clusters’ centres with a predefined threshold. Then, the detected faults can be diagnosed by calculating the contribution of each variable in the fault detection index. Furthermore, for easily analysing the fault diagnosis results, the relative contribution for each sample data vector is considered. A numerical example and the Tennessee Eastman chemical process are used to demonstrate the performance of the proposed FCM-kNN for fault detection and diagnosis. 相似文献
15.
故障管理对于一个网络管理系统来说必不可少并非常重要。故障管理实现的好坏直接影响网络管理系统的性能,故障管理系统的设计必须有功能全、可靠性高、使用范围广、使用便捷等特点。探讨了网络故障管理系统的设计与实现。 相似文献
16.
针对计算机绘图实验室的计算机绘图软件在网络克隆后不能直接使用,需要逐台计算机进行软件许可证安装配置从而导致工作效率低下的问题,提出了综合运用联想硬盘保护系统、凤麟教学多媒体软件和MS-DOS批处理程序技术对计算机绘图软件进行批量自动化管理的方法。该方法使用联想硬盘保护系统进行多种计算机绘图软件的初始批量安装,运用凤麟教学多媒体软件的远程桌面控制功能批量安装和配置软件许可证,应用MS-DOS批处理程序自动获取软件许可证所需系统参数从而简化软件许可证安装配置过程中的操作步骤。本校公共基础课实验教学中心的计算机绘图实验室运用该自动化管理方法成功实现计算机绘图软件的自动化批量安装和维护,提高了实验室工作效率和管理水平。 相似文献
17.
王清 《科技成果管理与研究》2008,(7):90-92
随着现代信息社会的快速发展,计算机技术的应用已经触及社会的每一个角落,计算机系统的应用也愈加广泛,随之而来的问题——系统软件的老化导致系统性能衰退甚至崩溃的现象越来越严重。软件恢复是一种针对系统中的软件使用过程中出现的软件老化现象提出积极反应的技术。 相似文献
18.
软件开发是一种创造性很强的活动,由于项目的一次性和独特性的特点,因此在软件项目实施完后,很多在项目实施过程中积累起来的知识经验就会随着项目的结束而消失,从而忽略了让开发小组从历史项目中学习和总结经验的机会。本文对项目后评价的定义以及实施意义进行了描述,并对两种不同的项目后评价方法作出了比较分析,最后以某高校学生选课系统项目为例,阐述了如何实施项目后评价工作,并为该项目的日后改进提出了意见和建议。 相似文献
19.
软件测试不仅是软件开发生存周期过程中最艰巨、最复杂的任务,也是软件开发过程中的一个非常重要的阶段。软件测试的目的不仅发现软件的错误与缺陷,还对软件的质量进行度量和评估,确保软件质量,提高软件可靠性。主要从软件测试方法、原理、应用、可行性研究等方面进行分析。 相似文献
20.
王海军 《科技成果管理与研究》2010,(7):87-88,108
锦7块位于辽河盆地西部凹陷西斜坡南段第一断阶带上，断块被两条北东向断层所夹持，呈长条状，西界为锦14断层，东界为地层下倾部位的-1075m构造线。断块东西长8km，南北宽0．8km，构造面积6．29Km2，地质储量1486×104t。构造总体形态是由西向东倾没的断鼻构造。 相似文献