• 전기학회논문지
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• 제59권1호
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• pp.192-196
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• 2010

Due to a development of a modem technology as Power Line Communication(PLC) over 200 Mbps, the high-speed multi-media data trasmission could be currently possible. The strength of the PLC has no more additional wiring work. PLC has also possible to high quality data transmission with currently electrical cable. It has a various strong point campare with existing wire and wireless communication technologies. In This paper we develop a high quality media transmitter-receiver based on merging the HomePlug AV, which is 200 Mbps class PLC technology and HDMI Interface technology. The video function was used for the VEDEO TEST GENERATOR in order to a property valuation. Smart Live 6 software were used for the assessment of audio property. As the result of measurement of the HD class images by capturing from the receiver of the PLC, the quality of images couldn't be confirm any deterioration, which has compared with original reflections. In case of audio part as the result of confirmation of the Phase, Magnitude, it has been confirmed that over 90% of nomal transmition and receiving of acoustic signal. It can be possible to have HD class Media service through the PLC.

• 한국정보통신학회논문지
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• 제11권8호
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• pp.1478-1485
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• 2007

본 논문에서는 풍향 풍속 계측모듈 및 DSP 센서인터페이스 회로 보드를 포함하는 기상계측 시스템을 제안한다. 이 DSP 시스템은 풍향풍속모듈, 대기압센서, 대기 온도 센서의 정보를 받아들이고, 빠르게 처리하여 PC 모니터링 시스템에 전달한다. 특히 풍향 풍속 모듈과 DSP 하드웨어는 직접 설계하여 적용한다. 풍향 풍속 모듈은 바람에 관한 벡터적 정보를 얻기 위해 4개의 박막형 RTD(Resistive Temperature Detectors) 저항센서를 히팅 코일에 의해 일정하게 가열된 원기둥 모양의 지지 표면에 벡터적으로 배치하는 구조를 채택한다. 이 구조를 채택한 계측 모듈은 진동, 습기, 부식 등에 강인하면서 정확한 계측을 가능케 한다. 센서 신호처리 회로는 TI사의 고속 DSP인 TMS320F2812 사용한다. 적용된 풍향 풍속 모듈을 통해 얻어진 데이터와 DSP 인터페이스 회로보드의 빠른 데이터 처리를 통해 저렴한 기상계측시스템을 구성 할 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1450-1452
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• 2005

AC Servo system has been implemented to semiconductor equipments system for their requirements of the high resolution control. This paper is based on the newly produced DSP TMS320F2812 which has the performance of fast processing speed, 150 MIPS, and rich peripheral interface. The implemented system has been developed for the position control that also has speed and current control as inner loops. The controller implemented a high precision position control system with SVPWM and digital PI control and using high resolution rotary encoder.

• 한국전자통신학회논문지
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• 제12권6호
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• pp.1009-1018
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• 2017

우리는 한국우주전파관측망(: Korea VLBI Network: KVN)에 적용 가능한 새로운 디지털 샘플러를 개발하였다. 이 샘플러는 1024MHz 샘플링으로 2bits/sample의 성능을 가지고 있다. 입력 기준 주파수 Clock은 1PPS(: Pulse per second)와 10MHz를 사용하며, 1PPS 신호에 동기되어 UTC(: Universal Time Coordinated) 시각정보가 출력된다. 샘플링된 데이터 출력은 시각정보를 포함한 VSI(: VLBI Standard Interface)규격을 채택하고 있다. 개발된 샘플러의 성능을 검증하기 위하여, KVN 울산전파천문대에 설치하여 우주 전파 관측 시험을 수행하였다. 관측시험 결과, 안정적인 성능을 보여 주었다. 본 논문에서는 새로 개발된 샘플러와 관측 시험 결과를 발표하고자 한다.

• 한국전자통신학회논문지
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• 제9권8호
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• pp.915-919
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• 2014

전 세계적으로 스마트폰이 널리 보급되고 있으며, 이에 따라 이동통신망에서 데이터 통신의 수요가 폭증하고 있다. 이를 수용하기 위하여 전 세계적으로 LTE-Advanced와 같은 차세대 이동통신 서비스가 보급되고 있다. 이러한 LTE-Advanced 기지국을 구현함에 있어서 DU(digital unit)와 RU(radio unit)로 분리된 형상의 기지국이 많이 사용되고 있다. 이때에 DU와 RU를 연결하는 네트워크 구간인 Fronthaul 구간에 기존에는 CPRI(common public radio interface)라는 디지털 광통신 기술로 구현되어 왔으나, 폭증하는 데이터 수용을 감당하기에는 그 한계에 다다른 상태이다. 따라서, 본 논문에서는 이 구간을 아날로그 광통신 기술인 RoF(Radio over Fiber)로 구현하여 폭증하는 전송용량을 경제적으로 수용할 수 있는 방안을 연구하였다. 또한, LTE-Advanced 이동통신망의 Fronthaul 구간을 RoF로 구현하기 위한 기술적인 요구사항을 연구하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.237-239
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• 2001

This paper describes the digital relay simulator system using digital signal processor. The simulator system has two parts, one is software and the other is hardware part. The simulation software has variety calculation engines ; EMTP simulation data file conversion, user define simulation data generation, sequence data generation, data analysis engines. etc, these are designed upon GUI. And simulator software provides easy control interface for users, the simulator software performs on every MS Windows OS. The simulator hardware design uses 32bit floating point DSP(TMS320C32) architecture to achieve flexibility and high speed operation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.284-287
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• 2001

In this paper, we designed and implemented a precise pulse motor control chip that generates the parabolic speed pattern. This chip can control step motor[1], DC servo[2] and AC servo motors at high speed and precisely. It can reduce the mechanical vibration to the minimum at the change point of a degree of acceleration. Because the parabolic speed pattern has the continuous acceleration change. In this paper, we present the pulse generation algorithm and the parabolic pattern speed generation. We verify these algorithm using visual C++. We designed this chip with VHDL(Very High Speed Integrated Circuit Hardware Description Language) and executed a logic simulation and synthesis using Synopsys synthesis tool. We executed the pre-layout simulation and post-layout simulation with Verilog-XL simulation tool. This chip was produced with 100 pins, PQFP package by 0.35 um CMOS process and implemented by completely digital logic. We developed the hardware test board and test program using visual C++. We verify the performance of this chip by driving the servo motor and the function by GUI(Graphic User Interface) environment.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제48권1호
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• pp.42-47
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• 1999

This paper presents the information transmission between on-board and ground-site in MAGLEV. considering safety and high speed operation and density operation, information transmission between them is necessary. Therefore it is necessary for transmission system to ensure high speed transmission, low error rate, massive information, and reliability of information. To provide above conditions, 1.1km signal line assembly was constructed and Frequency Shift Keying(FSK) modulation and Open System Interconnection(OSI) based high-level data link control(HDLC) protocol are applied. To modulate digital signal for transmission from ground-site to on-board, carrier frequency of 70kHz is used and 90khz is used for transmission from on-board to ground-site. Transmission speed is 2400bps for consideration of train speed, quantity of information, and data error rate. And this paper introduces information monitoring considering user interface and presents the method for an effective data transmission in MAGLEV which is now being tested and intends to provide for an intelligent train operation system in future.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.69-72
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• 1997

A universal controller is designed using a DSP (digital signal processor). The design objectives of the system are to implement control algorithms that require a lot of calculations and to develop a convenient user-interface environment. To demonstrate the efficiency of the system, the time delay control algorithm is implemented for the 2 D.O.F.SCARA type robot and the experimental results are presented.

• Journal of Mechanical Science and Technology
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• 제16권2호
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• pp.165-174
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• 2002

In the present study, interfacial cracks between an isotropic and orthotropic material, subjected to static far field tensile loading are analyzed using the technique of photoelasticity. The fracture parameters are extracted from the full-field isochromatic data and the same are compared with that obtained using boundary collocation method. Dynamic photoelasticity combined with high-speed digital photography is employed for capturing the isochromatics in the case of propagating interfacial cracks. The normalized stress intensity factors for static cracks are greate. when ${\alpha}$: 90$^{\circ}$(fibers perpendicular to the interface) than when ${\alpha}$=0$^{\circ}$(fibers parallel to the interface), and those when ${\alpha}$=90$^{\circ}$are similar to ones of isotropic material. The dynamic stress intensity factors for interfacial propagating cracks are greater when ${\alpha}$=0$^{\circ}$ than ${\alpha}$=90$^{\circ}$. For the velocity ranges (0.1 < C/C$\sub$s1/<0.7) observed in this study, the complex dynamic stress intensity factor │K$\sub$D/│increases with crack speed c, however, the rate of increase of │K$\sub$D/│with crack speed is not as drastic as that reported for homogeneous materials.