检索结果-内蒙古大学图书馆

International Conference on Military Communications and Information systems (ICMCIS)

作者： Fikadu T. Dagefu Gunjan Verma Predrag Spasojevic Brian M. Sadler Electrical Engineering Dept. King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Power System Control Department Metropolitan Electricity Authority Bangkok Thailand

ISBN: (纸本)9781538638590

Reliable, ad hoc communication among multiple users is a crucial objective in complex tactical scenarios. A major challenge is that synchronization mechanisms (such as GPS) are intermittent and fixed centralized coordinators (e.g., base stations) are infeasible. Classical approaches to multiuser communications relying on tight time synchronization and/or power control are impractical in such scenarios. Furthermore, state-of-the-art systems operating at microwave frequencies suffer from lack of penetration and multipath effects causing significant channel variability and exacerbating the near-far effect. In this paper, we investigate the potential advantages of the favorable channel characteristics of the lower VHF band for reliable multiuser communications in highly cluttered environments among near ground nodes. We focus on a class of code division multiple access (CDMA) strategies known as quasi-synchronous (QS) direct sequence (DS) CDMA and use moderate to high QAM constellations. A key aspect of QS CDMA codes is their robustness to coarse inter-user time synchrony and power mismatch, which greatly relaxes the rate that nodes must re-synchronize with each other. Our study experimentally explores the possibilities of multiuser communications in harsh environments among near-ground nodes. Our measurements involve three canonic indoor-to-outdoor, indoor-to-indoor and through-building channels characterized by obstacles and clutter that represent very difficult propagation environments, especially at microwave frequencies. We also study the spatial and temporal variability of our system and characterize the impact of frequency offset on code orthogonality with simulations and experiments. We show that our system has strong potential for excellent multiuser performance in infrastructure-poor regimes.

关键词： Signal to noise ratio Interference Global Positioning system Simulation Delays Semiconductor device measurement Power measurement

来源：评论

学校读者我要写书评

暂无评论

Towards an intelligent reconfigurable BLDC motor controller: Commutation configuration and parameters detection

引用

AIP Conference Proceedings 2019年第1期2187卷

作者： Agus Mukhlisin Estiko Rijanto I. Nyoman Sutantra Muhammad Nur Yuniarto Agus Sigit Pramono 1Sepuluh Nopember Institute of Technology Department of Mechanical Engineering Surabaya Indonesia 2Research Center for Electrical Power and Mechatronics Indonesian Institute of Sciences LIPI Indonesia 3Design Laboratory Mechanical Eng. Dept. Institut Teknologi Sepuluh Nopember Surabaya Indonesia 4Sepuluh Nopember Institute of Technology Center of Automotive Control System IPTEK Surabaya Indonesia

One of the key components in an electric vehicle is brushless direct current (BLDC) motor controller. At present, it is difficult to match a self-made motor controller with several different BLDC motors available in the global market. One of the reasons is that the Hall sensors’ configuration is not well informed. Another reason is the motor parameter’s values used in the controller are not well suited with the real physical conditions of the motor. This study aims to design an intelligent reconfigurable BLDC motor controller. In this paper, a method for automatic commutation configuration and automatic parameter values detection is presented. The Hall sensors and motor phases configurations are identified. The BLDC motor parameter values are detected automatically using mathematical models. Those parameters include internal resistance, inductance, coefficient of back electromotive force (BEMF), torque coefficient, friction coefficient, and moment of inertia. Experimental results of the automatic commutation configuration and parameter values detection are presented. Those results were used to develop a current controller. Further experimental results indicated that the method could be implemented in a BLDC motor current controller.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Present condition of JFE-SCADA system and future prospects

引用

JFE Technical Report 2016年第21期 146-152页

作者： Matsushita, Yasushi Goto, Mitsuyuki System Integration Dept. Electrical and Control System Center JFE Engineering Japan Energy Plant System Gr. System Integration Dept. Electrical and Control System Center JFE Engineering Japan

Since the 2000s, the development of the communication technology has changed the architecture of remote monitoring system from specialized equipment to general-purpose computers. JFE engineering has developed the remote monitoring system for pipelines since the 1980s, and has been tackling development of JFE-SCADA of original specifications which is suitable for remote monitoring. In recent years, in addition to the pipeline applications, JFE engineering enlarged the SCADA system to solar power plants as a package. This paper outlines achievements and future prospects in these activities. Copyright © 2016 JFE Steel Corporation. All Rights Reserved.

关键词： Pipelines

来源：评论

学校读者我要写书评

暂无评论

A neural network for predicting unintentional lane departures

A neural network for predicting unintentional lane departure...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： Jamaa M. Ambarak Hao Ying Fazal Syed Dimitar Filev Dept. of Electrical and Computer Engineering Wayne State University Detroit Michigan USA Hybrid Electric Vehicle Control System Ford Motor Company Dearborn Michigan USA Research and Advanced Engineering Ford Motor Company Dearborn Michigan USA

ISBN: (纸本)9781509053216

Unintended lane departure accidents are due to driver's inattention, incapacitation, and drowsiness. Lane departure warning systems have been developed to enhance traffic safety by predicting/detecting driving situation and alerting drivers to avoid or mitigate traffic accidents. This paper explores effectiveness of a three-layer perceptron neural network in predicting an unintentional lane departure, which to the best of our knowledge has not been reported in the literature. This study used driver experiment data generated by VIRTTEX, a hydraulically powered 6-degrees-of-freedom moving base driving simulator at Ford Motor Company. The experimental data represented 16 drowsy drivers who drove a simulated 2000 Volvo S80 (three hours per driver), which consisted of a total of 3,508 lane departure occurrences. Two-third of the lane departures were randomly selected to generate training examples for the network (82,040 examples for a 0.2-second prediction horizon and 171,112 for a 0.5-second horizon). The number of hidden neurons as well as the input vehicle variables were optimized experimentally through the training process. The optimized network was then used to predict lane departure by processing the entire driving time series of the 16 drivers one by one after all the training data was removed from the time series. The network made a prediction at each sampling moment of the time series and there were over 6.3 million predictions. The overall recall and precision of the optimized network for the 0.2-second horizon were 99.74% and 99.66%, respectively, which degraded to 99.23% and 85.49%, respectively, when the horizon increased to 0.5 s.

关键词： Vehicles Training Roads Time series analysis Biological neural networks Alarm systems

来源：评论

学校读者我要写书评

暂无评论

New rank codes with efficient decoding

New rank codes with efficient decoding

引用

International Conference on engineering and Telecommunication

作者： E. M. Gabidulin Dept. of Radio Engineering and Control System Moscow Institute of Physics and Technology (State University)

ISBN: (纸本)9781538645482

Linear maximum rank distance (MRD) codes in vector representation for all parameters are known for many years [3], [4]. There exist fast decoding algorithms to correct rank errors and rank erasures for these codes [3], [5], [6], [7]. Recently, Sheekey [8] and other researches [9], [10], [11], [12] proposed new families of the vector MRD codes. No decoding algorithms were still described. In this paper, generator and parity-check matrices are constructed for a few new codes. Our contribution is a new construction of the vector MRD codes based on modification of codes from [3]. Efficient decoding algorithms are described.

关键词： Finite field New MRD codes Syndrome Decoding algorithm

来源：评论

学校读者我要写书评

暂无评论

Maintaining high level information security in enterprises using event correlation

UPB Scientific Bulletin, Series C: Electrical Engineering an...

引用

UPB Scientific Bulletin, Series C: Electrical engineering and Computer Science 2016年第1 1期78 78卷 73-86页

作者： VlǍdescu, Marius Sgârciu, Valentin Dept. of Automatic Control and System Engineering University Politehnica of Bucharest Romania

This paper presents measures for ensuring high level information security for enterprise systems. These mechanisms are based on the correlation of the events with risk factor, collected from the security systems deployed in the company's infrastructure. The role of event correlation systems is to detect real time security threats and to notify security personnel about those breaches, in order to take measures to reduce the impact of the threat. Our personal contributions in this field consist in creating correlation rules meant to ensure enterprise sensitive data confidentiality inside the company, mostly compromised by employees, and to secure industrial processes targeted by worms. We are also extending the functionality of the event correlation systems from alerting capabilities to real time response capabilities. Also, we conceived additional measures to secure the correlator, which involve approval workflows and encryption techniques.

关键词： Cryptography

来源：评论

学校读者我要写书评

暂无评论

Identification of Static Boundary Model Based on Gaussian Process Classification

引用

IFAC-PapersOnLine 2016年第11期49卷 787-792页

作者： Oyama, H. Yamakita, M. Sata, K. Ohata, A. Dept. of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo Japan Advanced Unit Management System Development Div. TOYOTA MOTOR CORPORATION Shizuoka Japan TECHNOVA INC. Higashifuji Technical Center Toyota Motor Corporation Shizuoka Japan

Due to the needs for CO2emission reduction, the control region for automotive engine system is pushed toward the boundary between normal and abnormal engine operations such as knocking and misfiring. When an engine is operated outside of admissible region, the engine or the catalyst is seriously damaged or passengers feel very uncomfortable. Therefore the identification of the boundary is highly demanded. In this paper we propose a design of experiment (DoE) strategy based on the Gaussian process classifier (GPC) with the expectation propagation (EP) algorithm. In the experimental result, the proposed algorithm can identify the boundaries of an engine benchmark problem, provided by the joint research committee of the Society of Automotive Engineers (JSAE) and Society of Instrument and control Engineers (SICE). © 2016

关键词： Gaussian distribution Classification (of information) Design of experiments Emission control Engines Gas emissions Gaussian noise (electronic) Engine control Engine modelling Gaussian Processes Identification algorithms Model based controls Statistical design

来源：评论

学校读者我要写书评

暂无评论

Study on establishing investment mathematical models for each application ESS optimal capacity in nationwide perspective

引用

Transactions of the Korean Institute of Electrical Engineers 2016年第6期65卷 979-986页

作者： Kim, Jung-Hoon Youn, Seok-Min School of Electrical Engineering Hongik University Korea Republic of Dept. of Electricity Control System Engineering Hongik University Seoul Korea Republic of

At present, electric power industry around the world are being gradually changed to a new paradigm, such as electrical energy storage system, the wireless power transmission. Demand for ESS, the core technology of the new paradigm, has been growing worldwide. However, it is essential to estimate the optimal capacity of ESS facilities for frequency regulation because the benefit would be saturated in accordance with the investment moment and the increase of total invested capacity of ESS facilities. Hence, in this paper, the annual optimal mathematical investment model is proposed to estimate the optimal capacity and to establish investment plan of ESS facility for frequency regulation. The optimal mathematical investment model is newly established for each season, because the construction period is short and the operation effect for the load by seasons is different unlike previous the mathematical investment model. Additionally, the marginal operating cost is found by new mathematical operation model considering no-load cost and start-up cost as step functions improving the previous mathematical operation model. ESS optimal capacity is established by use value in use iterative methods. In this case, ESS facilities cost is used in terms of the value of the beginning of the year. Copyright © The Korean Institute of Electrical Engineers.

关键词： Investments

来源：评论

学校读者我要写书评

暂无评论

A study on establishing operation mathematical model for optimum capacity estimation of the ess applications for each in the nationwide perspective

引用

Transactions of the Korean Institute of Electrical Engineers 2016年第6期65卷 969-978页

作者： Kim, Jung-Hoon Youn, Seok-Min School of Electrical Engineering Hongik University Korea Republic of Dept. of Electricity Control System Engineering Hongik University Seoul Korea Republic of

Around the world are increasing the demand for ESS. Currently, the domestic is expected to benefit by operating ESS. In the domestic, it is expected to benefit from operations of the installed ESS because of the introduction of ESS less capacity. However ESS capacity to the maximum profit occurs is unknown. ESS is different from the charge-discharge characteristics and the reserve to replace, depending on the application. Therefore, it should be established in accordance with the ESS optimal capacity according to the purpose used because it can maximize the quality and efficiency of the electric energy. To the ESS optimal capacity estimation by the purpose used, It should compare the investment cost caused by ESS facility installation and operation cost caused by operating ESS. In this paper, the operation mathematical model for estimating marginal operation costs established. In operation mathematical model, operating cost is considered fuel cost and no-load cost start-up cost. Because no-load cost and start-up cost are not related to cost and power plant output, there are expressed an integer variable costs as a step function. Copyright © The Korean Institute of Electrical Engineers.

关键词： Operating costs

来源：评论

学校读者我要写书评

暂无评论

Computer aided system for seismic surveying process using UAVs

Computer aided system for seismic surveying process using UA...

引用

Conference of Basic Sciences and engineering Studies (SGCAC)

作者： Ahmed O. G. Ramadan Sami El Ferik Dept. System and control Engineering King Fahd University for petroleum and minerals Dhahran Saudi Arabia

In this paper, a methodology for a texture-based classification between sand and rock images will be proposed, and an object recognition algorithm is added for the sand images. Eighteen types of sand and rock textures have been used to extract different type of features which are hypothetically should help in the classification process. The features discrimination ability were tested and ranked using t-test and signal to noise ratio measurements respectively, and based on those, the features with the strongest discrimination power were selected to be used in the classification process to increase the efficiency and reduce the processing time. A back-propagation neural network classifier was trained using the best-selected features until an accuracy of 100% was reached. Different edge detection object recognition methods where used to detect objects in the sand images which was tested with 18 images and the result was an accuracy of 100%.

关键词： Feature extraction Rocks Entropy Training Signal to noise ratio Sensors Image resolution

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：