检索结果-内蒙古大学图书馆

Annual Conference of Industrial Electronics Society

作者： Rafael B.C. Lima Péricles R. Barros George Acioli Post-graduate Program in Electrical Engineering - PPgEE - COPELE UFCG Brazil Fed. University of Campina Grande Brazil Fed. University of Campina Grande Campina Grande PB BR

It is presented a state-space realization approach for identification of a pilot scale heat exchanger plant. The proposed methodology is a computational efficient way to estimate state-space models from experimental d... 详细信息

关键词： Heat recovery Heat pumps Resistance heating State-space methods Water heating Heat transfer

来源：评论

学校读者我要写书评

暂无评论

Transmission of real-time video signal with interference density and human traffic

引用

Telkomnika (Telecommunication Computing Electronics and Control) 2015年第4期13卷 1352-1360页

作者： Bahaweres, Rizal Broer Karya, Oki Teguh Alaydrus, Mudrik Post-Graduate Program of Electrical Engineering Departement Mercu Buana University Indonesia KompasTV Indonesia Faculty of Science and Technology State Islamic University Syarif Hidayatullah Jakarta Indonesia

The use of mobile phone as a communication tool rapidly increases, as well as various types of functions therein. Among of the many applications on the mobile phone, which are used skype androidbased for teleconferencing via mobile phone. Things can not be separated from these applications is the need of qualified internet network access for these applications can be felt up function. One of the network access to the Internet is widely used today's society is a wi-fi network. Access to the Internet does not always provide the best performance, this is due to many factors, one of which is the presence of interference. In this study, we tested transmission of video signals in real-time using an application skype on the mobile phone. Skype run on wi-fi network, which is influenced by the presence of interference or objects such as human traffic in the network. Wireshark were used to obtain data reliability wi-fi network, known as QoS. While evalvid used to obtain the data QoE restricted only get the data PSNR (Peak Signal To Noise Ratio) and MSE (Mean Square Error). © 2015 Universitas Ahmad Dahlan.

关键词： Wi-Fi

来源：评论

学校读者我要写书评

暂无评论

Three-phase four-wire inverters based on cascaded three-phase converters with four and three legs

Three-phase four-wire inverters based on cascaded three-phas...

引用

IEEE Energy Conversion Congress and Exposition

作者： Joao P. R. A. Mello Cursino B. Jacobina Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering (PPgEE/COPELE) Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil

ISBN: (纸本)9781509007387

This paper presents three-phase converter topologies for four-wire systems. The converters are series connected by three-phase transformers with accessible neutral. They possess a common dc-link, which is the power supply of the system, and two or more converters, where one of them is connected directly to the ac system, and the others cascaded through three-phase transformers. The three-phase transformers have turn ratios that are calculated in order to maximize the number of levels produced by the inverters. The Level-Shifted Pulse Width Modulation technique is developed for two and three cascaded converters, and a control system is used to set the electrical grid currents on desired values. Simulation and experimental results are exposed for configurations with two cascaded converters, each one with either three or four legs.

关键词： three phase transformers Converters AC SYSTEMS cascades phase convertors Phase transformers Electric Power Source Inventors control systems three-phase four-wire Leg grid current

来源：评论

学校读者我要写书评

暂无评论

Four H-bridge based shunt active power filter for three-phase four wire system

Four H-bridge based shunt active power filter for three-phas...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Edgard L. L. Fabricio Cursino B. Jacobina Gregory A. A. Carlos Maurício B. R. Correa Academic Unity of Control and Industrial Processes Federal Institute of Parafba (IFPB) João Pessoa PB Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Post-Graduate Program in Electrical Engineering COPELE

ISBN: (纸本)9781467395519

This paper proposes a shunt active power filter (SAPF) composed of four H-bridge converters. Each of them is connected by means of isolation transformers. Compared to conventional topologies, the proposed converter permits reducing: dc-link voltage rating, grid current harmonic distortion and/or switching frequency (switching losses). A suitable control strategy to adjust the filter currents as well as dc-link voltage are presented. Two PWM strategies are designed to command the converter according to the reference voltage provided by the controllers. Simulation and experimental results are presented in order to validate theoretical approaches.

关键词： Topology Pulse width modulation Voltage control Harmonic analysis Wires Shunts (electrical) Harmonic distortion

来源：评论

学校读者我要写书评

暂无评论

Mechanomyography signals in spastic muscle and the correlation with the modified Ashworth scale

Mechanomyography signals in spastic muscle and the correlati...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： E. L. Santos M. C. Santos E. Krueger G. N. Nogueira-Neto P. Nohama Biomedical Engineering at the Graduate Program in Electrical and Computer Engineering Federal Technological University of Paraná - (CPGEI-UTFPR) Curitiba/PR Brazil Biomedical Engineering at the Graduate Program in Biomedical Engineering Federal Technological University of Paraná - (PPGEB-UTFPR) Biomedical Engineering UTFPR Curitiba PR Brazil Anatomy department Londrina State University Electrical Engineering Pontifical Catholic University of Paraná (PUCPR) Curitiba PR Brazil Electrical Engineering UTFPR and PUCPR Curitiba PR Brazil

ISBN: (纸本)9781457702198

The modified Ashworth scale (MAS) is the most widely used measurement technique to assess levels of spasticity. In MAS, the evaluator graduates spasticity considering his/her subjective analysis of the muscular endurance during passive stretching. Therefore, it is a subjective scale. Mechanomyography (MMG) allows registering the vibrations generated by muscle contraction and stretching events that propagate through the tissue until the surface of the skin. With this in mind, this study aimed to investigate possible correlations between MMG signal and muscle spasticity levels determined by MAS. We evaluated 34 limbs considered spastic by MAS, including upper and lower limbs of 22 individuals of both sexes. Simultaneously, the MMG signals of the spastic muscle group (agonists) were acquired. The features investigated involved, in the time domain, the median energy (MMGME) of the MMG Z-axis (perpendicular to the muscle fibers) and, in the frequency domain, the median frequency (MMG mf ). The Kruskal-Wallis test (pme. There was a high linear correlation between the MMG me and MAS (R 2 =0.9557) and also a high correlation as indicated by Spearman test (ρ=0.9856; pmf did not present significant differences between MAS spasticity levels. There was moderate linear correlation between MAS and MMG mf (R 2 =0.4883 and Spearman test [ρ = 0.4590; p

关键词： Muscles Correlation Skin Spectral analysis Biomedical engineering Elbow Vibrations

来源：评论

学校读者我要写书评

暂无评论

Analysis of the influence of the window used in the Short-Time Fourier Transform for High Impedance Fault detection

Analysis of the influence of the window used in the Short-Ti...

引用

International Conference on Harmonics and Quality of Power

作者： #x00C9 rica Mangueira Lima Núbia Silva Dantas Brito Benemar Alencar de Souza Wellinsílvio Costa dos Santos Laís Martins de Andrade Fortunato Post-Graduate Program in Electrical Engineering - PPgEE Federal University of Campina Grande - UFCG Campina Grande Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil Undergraduate student in Electrical Engineering Department (DEE) Federal University of Campina Grande - UFCG Campina Grande Brazil

A study on the length and type of the window function used in the Short-Time Fourier Transform (STFT), along with its suitability to extract the harmonic content from a High Impedance Fault (HIF) current is presented on this paper. Additionally, a method to detect HIF based on the phase angle of the third harmonic current is developed. The proposed algorithm performance is evaluated by two database: one containing HIF simulated signals and other containing actual HIF oscillographic records. This paper presents the current state of this research, and, so far, the method is able to detect HIF occurring in different types of surfaces (wet and dry), as well as it is insusceptible to typical noises present in the real oscillograms.

关键词： Harmonic analysis Time-frequency analysis Signal resolution Fourier transforms Impedance Conductors

来源：评论

学校读者我要写书评

暂无评论

An efficient heuristic for calculating a protected path with specified nodes

An efficient heuristic for calculating a protected path with...

引用

International Workshop on Reliable Networks Design and Modeling (RNDM)

作者： Lúcia Martins Teresa Gomes David Tipper INESC Coimbra DEEC Coimbra Portugal Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA USA

The problem of determining a path between two nodes in a network that must visit specific intermediate nodes arises in a number of contexts. For example, one might require traffic to visit nodes where it can be monitored by deep packet inspection for security reasons. In this paper a new recursive heuristic is proposed for finding the shortest loopless path, from a source node to a target node, that visits a specified set of nodes in a network. In order to provide survivability to failures along the path, the proposed heuristic is modified to ensure that the calculated path can be protected by a node-disjoint backup path. The performance of the heuristic, calculating a path with and without protection, is evaluated by comparing with an integer linear programming (ILP) formulation for each of the considered problems. The ILP solver may fail to obtain a solution in a reasonable amount of time, especially in large networks, which justifies the need for effective, computationally efficient heuristics for solving these problems. Our numerical results are also compared with previous heuristics in the literature.

关键词： Algorithm design and analysis Amplitude shift keying Integer linear programming Routing Routing protocols Heuristic algorithms Electronic mail

来源：评论

学校读者我要写书评

暂无评论

Modeling and control of a XY positioning table

Modeling and control of a XY positioning table

引用

IEEE/IAS International Conference on Industry Applications

作者： Lucas J. da S. Moreira Christian C. Dias Rafael B. C. Lima Péricles R. Barros George Acioli Júnior Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Graduate Program in Electrical Engineering - PGEE Electrical Engineering Department - DEE Federal University of Campina Grande - UFCG 58429-900 Campina Grande - PB - Brazil

ISBN: (纸本)9781509051281

This paper is about modeling and control of a XY positioning table. It is described the construction and instrumentation of a double axis positioning system. It is developed a general electromechanical model, followed by the identification of simplified models for control purposes. At last, it is proposed a PID control strategy, tuned by Internal Model Control (IMC) technique.

关键词： IMC XY PID

来源：评论

学校读者我要写书评

暂无评论

Retraction: LUC Algorithm in Visual Cryptography (J. Phys.: Conf. Ser. 1114 012090)

引用

Journal of Physics: Conference Series 2018年第1期1114卷

作者： Ratnadewi Christian Dio Alpha G Darmawan Napitupulu Heri Nurdiyanto Nuning Kurniasih Abdurrozaq Hasibuan GS Achmad Daengs Rosida Tiurma Manurung Indrya Mulyaningsih Robbi Rahim Castaka Agus Sugianto Dahlan Abdullah Department of Electrical Engineering Universitas Kristen Maranatha Bandung Indonesia Research Center for Quality System and Testing Technology Indonesian Institute of Sciences Banten Indonesia STMIK Dharma Wacana Indonesia Faculty of Communication Sciences Library and Information Science Program Universitas Padjadjaran Bandung Indonesia Universitas Islam Sumatera Utara Indonesia University of 45 Surabaya Indonesia Graduate Program in Scientific Psychology Universitas Kristen Maranatha Bandung Indonesia Department of Education Institut Agama Islam Negeri Syekh Nurjati Cirebon Indonesia School of Computer and Communication Engineering Universiti Malaysia Perlis Kubang Gajah Malaysia Politeknik TEDC Bandung Indonesia Department of Informatics Universitas Malikussaleh Aceh Utara Indonesia

This paper was retracted by IOP Publishing on 12 December 2018. This paper was published due to a technical error and was not intended to be included in this journal. Retraction published: 8 February 2019

关键词：

来源：评论

学校读者我要写书评

暂无评论

LUC Algorithm in Visual Cryptography

引用

Journal of Physics: Conference Series 2018年第1期1114卷

Nowadays, messaging technology in digital data form more often used and not less messages that confidentially wanted. Then it should be modified so that can be understood only by the sender and the intended recipients. All of this system can be realization by using cryptography. LUC algorithms are introduced by Smith and Lennon in 1993. LUC algorithm is an algorithm that based on the use of Lucas sequence (specific arithmetic operations derived from Lucas row) that rarely used to enhance the security of the messages. In this research, LUC algorithm is combined with visual cryptography to process the encryption and the description of a colored image. Four different images were used in the trial here. The performance of the system is assessed using Structural similarity (SSIM) which has an assessment similar to human eye. If the image quality is the same as the original image, then the SSIM value is one. Whereas if the quality of decryption image is very different from the original image then the value of SSIM is zero.

关键词：

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：