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Reduction of radiated electromagnetic interference in 4-phases pulse width modulation converter system

Reduction of radiated electromagnetic interference in 4-phas...

引用

Electrical Design of Advanced Packaging and systems Symposium, EDAPS

作者： Hee-Jung Kim Hyun Kim Seung-Young Ahn Il-Young Oh Jong-Gwan Yook Department of Electrical and Electronic Engineering Yonsei University Seoul South Korea Computer System Division Samsung Electronics Limited Suwon Gyeonggi South Korea

Radiated electromagnetic interference (EMI) in pulse width modulation (PWM) converter system is analyzed using discrete time Fourier series (DTFS) and a snubber circuit. The causes of radiated EMI are found through DTFS analysis of output waveform of switched voltage. By designing a snubber circuit with resistor (R) and capacitor (C) filter, overshoot and ringing of switched voltage are suppressed and the EMI is also reduced. The important factors are to minimize peak voltage and to reduce power dissipation in selecting of RC value. The design of snubber circuit is considered these points and measured EMI shows the improvement of 6 dBuV/m.

关键词： Electromagnetic interference Pulse width modulation converters Snubbers Voltage Pulse width modulation EMP radiation effects Pulse circuits Electromagnetic analysis Time series analysis Fourier series

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All-optical five-functional logic generator by using semiconductor optical amplifiers

All-optical five-functional logic generator by using semicon...

引用

International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD)

作者： Kyoung Sun Choi Young Min Jhon Seok Lee Jinwoo Park Department of Electronics and Computer Engineering Korea University Seoul South Korea Intelligent System Research Division Korea Institute of Science and Technology Seoul South Korea

All-optical five-functional logic generator is demonstrated by using the cross gain modulation (XGM) characteristics of four semiconductor optical amplifiers (SOAs). All-optical five-functional logic generator demonst... 详细信息

关键词： Semiconductor optical amplifiers Logic gates Probes Laser excitation Optical signal processing Clocks Optical wavelength conversion Character generation Stimulated emission Optical pumping

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Road traffic estimation based on position and velocity of a cellular phone

Road traffic estimation based on position and velocity of a ...

引用

International Conference on ITS Telecommunications (ITST)

作者： S. Promnoi P. Tangamchit W. Pattara-Atikom Department of Control System and Instrumentation Engineering King Mongkut''s University of Technology Thonburi Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

This research studies the proof of concept to road traffic estimation based on the position and velocity of cellular phones. The positioning technique, received signal strength method, was applied to obtain road traffic data. The two algorithms: Linear interpolation of position from signal strength and centroid of signal strength were implemented to identify the positions and velocity of a mobile phone in cars. Successfully estimated results, position and speed, showed that both of two methods have the potential to estimate traffic congestion while the first method is more efficient than another. According to the first method, it yielded an average error of 190.8 m, while the velocity estimation yielded an average error of 10.38 km/hr. The errors from another are 195.29 m and 10.39 km/hr respectively.

关键词： Cellular phones Mobile handsets Roads Base stations Neurons Interpolation Signal processing Broadcasting Velocity control Control systems

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A Performance Evaluation of Vertical Hanover Architecture with Low Latency Handover

A Performance Evaluation of Vertical Hanover Architecture wi...

引用

International Conference on Hybrid Information Technology, ICHIT

作者： Do-Hyung Kim Won-Tae Kim Hwan-Gu Lee Sun-Ja Kim Cheol-Hoon Lee Convergence SW Research Division Electronics and Telecommunications Research Institute South Korea Department of Computer Engineering System Software Laboratory Chungnam National University South Korea

This paper describes the vertical handover architecture with low latency handover for mobile terminals which supports interworking between heterogeneous networks. The vertical handover architecture defines handover-related modules for mobile terminal and the handover switching flows among them. We adapt low latency handover method to mobile IP for reducing handover time. The architecture is designed to be easily extended to support more than two heterogeneous networks, so that it is easy to apply architecture to terminals that have multiple heterogeneous wireless network interfaces. We analyze the performance of handover method in terms of handover delay time using test bed system.

关键词： Mobile communication computer architecture IP networks Wireless LAN Switches Mobile computing Network interfaces

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Design and Implementation of Embedded Linux Based Mobile Location-Awareness Service

Design and Implementation of Embedded Linux Based Mobile Loc...

引用

International Conference on Networked Computing and Advanced Information Management (NCM)

作者： Do-Hyung Kim Hwan-Gu Lee Won-Tae Kim Sun-Ja Kim Cheol-Hoon Lee Department of Computer Engineering System Software Laboratory Chungnam National University South Korea Convergence SW Research Division Electronics and Telecommunications Research Institute South Korea

This paper describes the design and implementation of mobile location-awareness service based on embedded Linux. In mobile location-awareness, the picture and GPS information at mobile terminal are stored on server through wireless network. With the mobile location-awareness, user can easily identify the location where the picture was taken on through Yahoo map. The implemented mobile location-awareness also helps user to manage pictures according to the location where they were taken and visit that place again. We verified functions of mobile location-awareness using MCC mobile terminal made by ETRI.

关键词： Mobile communication Servers Global positioning system Linux Mobile computing Acceleration Catalogs

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Design and Implementation of Mobile Broadcasting Service which Supports Personal Mobile Broadcasting in Wireless Environments

Design and Implementation of Mobile Broadcasting Service whi...

引用

International Conference on Networked Computing and Advanced Information Management (NCM)

This paper describes the design and implementation of embedded Linux based Mobile Broadcasting Service which supports personal broadcasting in wireless network environment. The Mobile Broadcasting Service makes possible for mobile user to make contents using his own terminal while he is moving or he is in a place, and send the created contents to server in real-time which has his blog Web page. All users connected to the his blog Web page can look and listen the contents in real-time. We verify the Mobile Broadcasting functions using MCC mobile terminal made by ETRI.

关键词： Broadcasting Servers Mobile communication Internet Web sites Information services Real time systems

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Design and Implementation of Mobile Cobrowsing Service which Supports the Sharing of Web Page Among Mobile Users

Design and Implementation of Mobile Cobrowsing Service which...

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International Conference on Hybrid Information Technology, ICHIT

作者： Do-Hyung Kim Hwan-Gu Lee Won-Tae Kim Sun-Ja Kim Cheol-Hoon Lee Convergence SW Research Division Electronics and Telecommunications Research Institute South Korea Department of Computer Engineering System Software Laboratory Chungnam National University South Korea

This paper describes the design and implementation of Mobile Cobrowsing Service based on embedded Linux Mobile Cobrowsing supports the sharing of same web page among mobile users. For effective web page sharing among mobile users, Mobile Cobrowsing provides the synchronization of web page movement, synchronization of web page scroll, synchronization of annotation, and management of control authority. It also provides the voice chatting function among users. Mobile Cobrowsing is developed on MCC mobile terminal made by ETRI and we verify the Mobile Cobrowsing service using web page contents.

关键词： Mobile communication Web pages Servers Synchronization Mobile computing Collaboration Wireless networks

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Design of 600Mbps 4×2 MIMO-OFDM Wireless LAN system and Its FPGA Implementation

Design of 600Mbps 4×2 MIMO-OFDM Wireless LAN System and Its...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Akihiro Teramoto Kunitoshi Nishijo Tadashi Maemura Yuhei Nagao Masayuki Kurosaki Hiroshi Ochi Kyushu Kogyo Daigaku Kitakyushu Fukuoka JP Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Department of Computer Science and Electronics Kyushu Institute of Technology Fukuoka Japan

This paper presents a model-based register transfer level (RTL) design of a 4times2 multiple-inputs multiple-outputs (MIMO)-orthogonal frequency domain multiplexing (OFDM) wireless communication systems transmitter and its field programmable gate array (FPGA) implementation. This system provides a maximum of 600 Mbps with 20 meter of propagation distance using 80 MHz baseband bandwidth with 4times2 MIMO scheme.

关键词： Wireless LAN Field programmable gate arrays Detectors Chromium Signal detection Cognitive radio Delay effects computer vision Radio spectrum management Frequency

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Design and Implementation of Smartphone Edition based on Embedded Linux

Design and Implementation of Smartphone Edition based on Emb...

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International Conference on Advanced Communication Technology (ICACT)

作者： Do-Hyung Kim Min-Hong Yun Sun-Ja Kim Cheol-Hoon Lee Embedded S/W Research Division Electronics and Telecommunications Research Institute South Korea Department of Computer Engineering System Software Laboratory Chungnam National University South Korea

The paper describes the design and implementation of Qplus Smartphone Edition based on embedded Linux. Existing Smartphone platforms entailed royalty expenses and had customization difficulties due to the closure of their source codes. The Qplus Smartphone Edition requires no royalty because it is based on the embedded Linux. And, it supports key navigation functionality such as moving between folders or running applications with key-only operations. It also provides more user friendly environment through screen interfaces and indicators similar to those of the cellular phones.

关键词： Linux Application software Kernel Graphics Libraries Cellular phones Databases Navigation Software architecture Telephony

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Which Spot Should I Test for Effective Embedded Software Testing?

Which Spot Should I Test for Effective Embedded Software Tes...

引用

International Conference on Secure system Integration and Reliability Improvement, SSIRI

作者： Jooyoung Seo Yuhoon Ki Byoungju Choi Kwanghyun La Department of Computer Science and Engineering Ewha University Seoul South Korea Mobile Solution System LSI Division Samsung Electronics Company Limited Yongin si South Korea

ISBN: (纸本)9780769532660

Today, the embedded industry is changing fast - systems have become larger, more complex, and more integrated. Embedded system consists of heterogeneous layers such as hardware, HAL, device driver, OS kernel, and application. These heterogeneous layers are usually customized for special purpose hardware. Therefore, various hardware and software components of embedded system are mostly integrated together under unstable status. That is, there are more possibilities of faults in all layers unlike package *** this paper, we propose the embedded software interface as two essential parts: interface function that represents the statement of communication between heterogeneous layers, and interface variable that represents software and/or hardware variable which are defined in different layer from integrated software and used to expected output for decision of fault. Also, we statically investigate various views of embedded software interface and demonstrate that proposed interface should be new criterion for effective embedded software testing.

关键词： Software Hardware Testing Complexity theory Software measurement system software Embedded system

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