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Control of Autonomous Solid Oxide Fuel Cells Subject to Sudden Load Variations

Control of Autonomous Solid Oxide Fuel Cells Subject to Sudd...

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2008 IEEE/PES Transmission & Distribution Conference & Exposition, part 1

作者： Dong-Jing Lee Li Wang Department of Electrical Engineering and Computer Science Chair for Computer Architecture and System Programming National Cheng Kung University Tainan Taiwan

This paper presents dynamic behaviors of autonomous solid oxide fuel cells (SOFC) with AC bus control. Both voltage and frequency control are utilized to achieve load-sharing of the studied SOFC feeding isolated loads. A DC-to-DC converter is connected to the output terminals of the studied SOFC for stabilizing output voltage and current fluctuations under different loading conditions. The PWM inverter connected to the output terminals of the DC-to-DC converter is operated under voltage-controlled mode to regulate the voltage profile across the connected loads. It can be concluded from the simulation results that the proposed voltage and frequency droop controllers of the PWM inverter may operate satisfactory under stand-alone mode.

关键词： Solid oxide fuel cells (SOFC) DC-to-DC converter PWM inverter Stand-alone mode

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Using the Model of a Functional Rationalizer of Consumer Behavior in Recommendation Systems for Managing the Transport Activity of the Urban Population 23

Using the Model of a Functional Rationalizer of Consumer Beh...

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23rd International Conference on Soft Computing and Measurements, SCM 2020

作者： Seliverstov, Yaroslav A. Seliverstov, Svytoslav A. Podoprigora, Nikolay V. Starichenkov, Alexey L. Naryshkin, Roman S. Solomenko Institute of Transport Problems Russian Academy of Sciences Institute of Computer Science and Technology Peter the Great St.Petersburg Polytechnic University Laboratory of Intelligent Transport Systems St. Petersburg Russia Saint Petersburg State University of Architecture and Civil Engineering Department of Ground Transportation Technological Machines St. Petersburg Russia Saint Petersburg Electrotechnical University 'LETI' Department of Ship Control Systems St. Petersburg Russia Saint Petersburg State University Department of Programming Technology St. Petersburg Russia

ISBN: (纸本)9781728196923

An overview of existing urban software mobile applications of the transport and economic direction is given. A model of a functional rationalizer of consumer behavior is being built. The software model of the functional rationalizer of consumer behavior (SM FRCB) was developed for the first time. PMFRCB allows the user to expand the number of his preferred needs (occupations, activities) during the daily cycle through intelligent recommendations. Also, SM FRCB allows you to optimize needs (activities, activities) at the cost and rate of their use. The SM FRCB is made in Python_3 using the libraries matplotlib, collections, numpy, pyplot, mplot3d. The analysis of consumer behavior before and after using the functional rationalizer model is carried out. The graphical results of a structural analysis of the costs of old and new consumer behavior, analysis of consumer behavior within the boundaries of the theory of possibilities and the model of transport behavior of a resident before and after applying the functional rationalizer model are presented. The prospects of further improving the SM FRCB are considered. © 2020 IEEE.

关键词： Smart city

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Statistical Analysis of Capacity Loss for Stored Batteries

Statistical Analysis of Capacity Loss for Stored Batteries

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International Conference on Electronics, computers and Artificial Intelligence (ECAI)

作者： Luminita–Mirela Constantinescu Bogdan–Adrian Enache Violeta–Georgiana Dogaru Teodor Iulian Voicila Irina Vilciu Silvia–Carmen Vasile Electronics Computer and Electrical Engineering Department University of Pitesti Pitesti Romania Measurements Electrical Apparatus and Static Converters Department University Politehnica of Bucharest Bucharest Romania Electrical Engineering Faculty University Politehnica of Bucharest Bucharest Romania Programming and Planning Department for the Teritorial Dispatch Center Bucharest Transelectrica S.A Bucharest Romania

Lithium-ion battery production is generally geared towards current demand from the main sectors: electric vehicles, consumer electronics, and energy storage. These sectors typically require the batteries to be as fresh as possible to ensure maximum lifespan and performance. Still, sometimes manufacturers work with buffer stocks and deliver batteries from different production series. In this context, the present paper examines stored batteries' capacity loss, employing an exhaustive statistical study. This study aims to establish if the capacity loss is statistically significant and can lead to battery pack unbalances.

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Methods for Using Class Based N-gram Language Models in the Kaldi Toolkit 23rd

Methods for Using Class Based N-gram Language Models in the ...

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23rd International Conference on Speech and computer, SPECOM 2021

作者： Pakoci, Edvin Popović, Branislav AlfaNum Speech Technologies Bulevar vojvode Stepe 40 Novi Sad21000 Serbia Faculty of Technical Sciences Department of Power Electronic and Telecommunication Engineering University of Novi Sad Trg Dositeja Obradovića 6 Novi Sad21000 Serbia Department of Music Production and Sound Design Academy of Arts Alfa BK University Nemanjina 28 Belgrade11000 Serbia Computer Programming Agency Code85 Odžaci Železnička 51 Odžaci25250 Serbia

ISBN: (纸本)9783030878016

This paper explains in detail several methods for utilization of class based n-gram language models for automatic speech recognition, within the Kaldi speech recognition framework. It reexamines an existing implementation for word-level grammars, and then presents two methods of converting ARPA-format language models into a corresponding weighted finite state transducer which is then used for decoding in Kaldi in a usual way. One of the methods relies on implicit expansion of class n-grams within the language model during the conversion into the transducer, and the other one on explicit expansion of the ARPA file by changing class n-gram entries into an array of regular class instance n-grams, while the conversion procedure remains unchanged. Some limitations and optional restrictions for the procedures are discussed as well. The proposed methods are tested on a model trained on a Serbian judicial corpus which includes classes for all types of personal nouns (first names, last names, place names, street names and organization names). © 2021, Springer Nature Switzerland AG.

关键词： Speech recognition

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Method for calculating of R-learning traffic peakedness

Method for calculating of R-learning traffic peakedness

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International Scientific-Practical Conference Problems of Infocommunications Science and Technology

作者： Nina Kuchuk Oleksandr Mozhaiev Mykhailo Mozhaiev Heorgii Kuchuk Department of Computer Science National University Kharkiv Ukraine Laboratory on Speech and Audio Computer Engineering and Telecommunication Kharkov SRI examinations named Dist. prof. N.S. Bokariusa Kharkiv Ukraine Department of Information Technologies Kharkiv National University of Internal Affairs Kharkiv Ukraine Department of Computer science and programming National Technical University “Kharkiv Polytechnic Institute” Kharkiv Ukraine

In this article e-leaming traffic which is served by system on the hyper convergent platform is considered. It was done the analysis of the known methods of determine the degree of pulsation of traffic. The method for calculating of e-learning traffic peakedness is proposed. Simulation and calculation results peakedness is analyzed.

关键词： Wireless networks Economic indicators System implementation

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Advanced IOT Traffic Light Control System

Advanced IOT Traffic Light Control System

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International Conference on Advances in Computational Tools for engineering Applications, ACTEA

作者： Martin Abou Hamad Antonio El Hajj Roy Abi Zeid Daou Ali Hayek Gaby Abou Haidar Biomedical Technologies Department Faculty of Public Health Lebanese German University Lebanon MART Learning Education and Research Center Lebanon Department of Computer Architecture and System Programming University of Kassel Kassel Germany Engineering Faculty American University of Science and Technology Zahle Lebanon

For several years, traffic congestion has been a major problem in big cities where the number of cars and different means of transportation has been increasing significantly. The problem of congestion is becoming more and more critical, and if not treated smartly this issue will negatively affect drivers by wasting time and fuel gas while waiting for hours in lanes. This paper presents a new and smart way to mitigate this issue in an affordable cost, minimum processing power, and low power consumption. This concept takes into consideration the majority of the cases that may cause congestion and presents a smart and accurate outputs to ease traffic flow leading to the prediction of the peak hours of traffic congestion for smarter control. A model is designed to study the case of a four lanes crossroad with two traffic lights and two LCD monitors. The strategy in reading data is divided into two parts: real data from sensors and pre collected data from google maps to create a kind of a predicted pattern over a certain time interval. The responsiveness of the system is analyzed thoroughly, and the accuracy of all possible cases is carefully considered and evaluated. Each part of the system was tested alone, and the overall system is still in an ongoing testing phase. The results have shown minimum faulty errors and accepted outputs that can lead to safe traffic control decisions. Finally, integrating more IoT devices and sensors between V2V, V2P, V2I with the help of artificial intelligence will definitely optimize this system with higher accuracy.

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Redundant optical data transmission using semiconductor lasers

Redundant optical data transmission using semiconductor lase...

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ACS/IEEE International Conference on computer Systems and Applications

作者： H. D. Wacker J. Borcsok H. Hillmer Development HIMA Paul Hildebrandt GmbH + Co KG Bruehl GERMANY Department of Electrical Engineering and Computer Science Chair for Computer Architecture and System Programming Kassel GERMANY University of Kassel Institute of Nanostructure Technologies and Analytics (INA) and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT) Kassel GERMANY

This paper is dealing with redundant optoelectronic data transmission with special respect to laser channels. The concept of the generalized erasure channel (GEC) is used to determine the probability of undetected error for some binary symmetric and non-symmetric channels protected by appropriate codes. In detail, communication via different binary symmetric channels (BSCs), generalized erasure channels and symmetrized binary non symmetric channels (BNSCs) is investigated. Simple upper bounds are given, relating the new formulas to that one of the BSC Finally the results in connection with an inequality for proper codes are applied to multi wavelength optical transmission through channels generated by semiconductor lasers.

关键词： Data communication Semiconductor lasers Error probability Optical transmitters Protection Safety Wavelength division multiplexing Laser theory Upper bound Linear code

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Design and Implementation of a QoL Improvement System for Visually Impaired Patients

Design and Implementation of a QoL Improvement System for Vi...

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International Conference on Advances in Computational Tools for engineering Applications, ACTEA

作者： Roy Abi Zeid Daou Jad Beaino Johnny Hawat Ramy Ibrahim Ali Hayek Josef Boercsoek Jose Javier Serrano Olmedo Mechatronics department Faculty of Engineering Université La Sagesse Beirut Lebanon MART Learning Education and Research Center Chananir Lebanon Department Lippstadt 2 Hardware Engineering University of Applied Science Hamm-Lippstadt Hamm Department of Computer Architecture and System Programming Faculty of Electrical Engineering/Computer Science University of Kassel Germany Lab of Bioinstrumentation and Nanomedicine Centro de Tecnología Biomédica Universidad Politécnica de Madrid Spain

Visually impaired people encounter several challenges in their mobility and navigation. Their daily activities are obstructed due to their inability to adapt or recognize accurately their surroundings, especially outside their house which they are more familiar with. Thus, it becomes the main reason of accidents, falling off, getting lost in unknown areas, etc. Furthermore, one of the sensory systems that helps the body to process data about the external environment is the visual system. Blind people also lose touch with the outside world, develops poor motor habits, which results in postural problems as a result. This project will assist visually impaired people in their daily life and simplify normal tasks through a system combining two previously designed projects, “Smart Shoes for Blind and Visually Impaired People”, and “Human posture monitoring device”. The multifunctional system is developed with the goal of securing safe movements for visually impaired people as well as maintaining a good back posture by detecting leaning postures (LP). The purpose of the smart shoe is to identify obstacles and protect the user from unintended accidents. A compatible Android application has been developed to alert the user when there is an obstruction or when he is walking on a wet surface. Voice alarms will be used to acoustically alert the user. If the user collapses, a message with their position will be sent right away to a relative. On the other hand, the smart vest will identify the position of the user's back and alert him to maintain a straight posture through the same application as well. As the system is dealing with human health, some safety measurements would be taken into consideration to implement a safe electrical system in order to reduce error and to increase accuracy.

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OpenModelica - A free open-source environment for system modeling, simulation, and teaching

OpenModelica - A free open-source environment for system mod...

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IEEE International Conference on computer-Aided Design

作者： Peter Fritzson Peter Aronsson Adrian Pop Hakan Lundvall Kaj Nystrom Levon Saldamli David Broman Anders Sandholm PELAB-Programming Environment Laboratory Department Computer Science Linköping University Linkoping Sweden MathCore Engineering AB Teknikringen 1B SE-583 30 Linköping Sweden EPACT AB Linköping Sweden

Modelica is a modern, strongly typed, declarative, and object-oriented language for modeling and simulation of complex systems. This paper gives a quick overview of some aspects of the OpenModelica environment - an open-source environment for modeling, simulation, and development of Modelica applications. An introduction of the objectives of the environment is given, an overview of the architecture is outlined and a number of examples are illustrated.

关键词： Open source software Education Load modeling Protection Equations Control systems System testing Packaging Connectors

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Comparision of Multi-Carrier Techniques in Seven-Level Asymmetric Cascade Multilevel Inverter

Comparision of Multi-Carrier Techniques in Seven-Level Asymm...

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International Conference on Power engineering, Energy and Electrical Drives

作者： Ilhami COLAK Ersan KABALCI Gokhan KEVEN Faculty of Technology Department of Electric & Electronic Engineering Gazi University Ankara Turkey Faculty of Engineering & Architecture Dep. of Electrical & Electronic Eng. Nevsehir University Nevsehir Turkey Vocational College of Haci Bekta? Veli Dep. of Computer Programming Nevsehir University Nevsehir Turkey

ISBN: (纸本)9781467363914

The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and asymmetric topologies. Asymmetric Cascade MLI (ACMLI) topologies consist of unequal DC sources. Many modulation techniques have been used in ACMLI topology such as Multi-Carrier PWM (MC-PWM), Space Vector PWM and Selective Harmonic PWM. The MC-PWM technique is achieved by four different types. In this study, MC-PWM techniques which are named Phase Disposition PWM, Phase Opposition Disposition PWM, Alternate Phase Opposition Disposition PWM and Phase Shifted PWM have been compared. It is uncovered that Phase Opposition Disposition PWM technique is more convenient in terms of Total Harmonic Distortion of output voltage and current signals and in terms of the quality of power factor in ACMLI which is performed in this study.

关键词： asymmetric cascade multilevel inverter multi carrier PWM THD frequency index power factor

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