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태양광발전 연계 가정용 배터리 에너지저장장치의 블랙박스 개발
김상동(Sang-Dong Kim),박지호(Ji-Ho Park),김동완(Dong-Wan Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.7
In this paper, a black box, which is provided the reliability and user safety of home battery energy storage system connected with solar energy generation, is developed. In the developed scheme, a status and diagnosis data of battery management system, power conditioning system, solar energy generation and grid is measured. This status and diagnosis data is stored and displayed in the developed black box. In addition, this status and diagnosis data is stored and displayed in a monitoring system and a smart phone of user. A performance evaluation of the developed black box is carried out using emulator of home battery energy storage system connected with solar energy generation. Consequently, the developed black box is proved its superiority of the reliability and user safety.
전력선통신을 이용한 소규모 주택용 맞춤형 전력피크 제어시스템 개발
김상동(Sang-Dong Kim),박지호(Ji-Ho Park),김동완(Dong-Wan Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.1
In this paper, adaptive home power peak-cut control system is developed using PLC. The developed scheme provides monitoring of power usage, power peak-cut control and additional function. In test bed, zone is presented by bedroom, living room, kitchen and bathroom. And individual load is presented by lighting, heater and fan in zone. In developed scheme, zone control is implemented by single PLC modem. And individual load control is implemented by key-map table. In addition, power peak-cut control system S/W, which can perform setting of power peak, power peak-cut control and monitoring of power usage.
실내 측위에서 AP 배치가 측위 정확도에 미치는 영향 분석
김상동(Sang-Dong Kim),이종훈(Jong-Hun Lee),정우영(Woo-Young Jung),박용완(Yongwan Park) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we analyze the effect of access point (AP) deployment on the accuracy of indoor localization. Two representative geometrical arrangements of AP deployment are selected. One is that a Tag is centered at the regular triangle composed of 3 AP's, and the other is that a Tag is set apart from the straight line composed of 3 AP's. As a result of simulation, the first case has a probability of 93% with distance errors within 1m, while the second case has a 32% of probability.
수평식 연속주조법에 의한 순 Al 및 Al-5wt%Si 합금 주괴제조시 주조변수에 관한 고찰
김상동,조형호,김명한 ( Sang Dong Kim,Hyung Ho Jo,Myung Han Kim ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.6
N/A The effect of casting variables for making pure Al and Al-5wt%Si alloy rods free from any surface and inside defects was studied by adopting the horizontal continuous casting method with heated mold. The rods were cast under the casting conditions such as the mold temperature of 670∼690℃, water flow rate of 0.2∼0.6ℓ/min, and rod diameter of 4∼8㎜, when the melt temperature and mold to cooler distance was fixed at 700℃ and 20㎜, respectively. The results represented that the casting speed for good quality rod increased as the water flow rate increased, whereas, the casting speed decreased as the rod diameter or mold temperature increased. The statistical analysis of 2³factorial design was also applied and the results represented that the averaged optimum casting speed for pure Al(302㎜/min) was higher than that of Al-5wt%Si alloy(273㎜/min) resulting from the difference of superheat applied. The effect of rod diameter on the optimum casting speed was the highest for pure Al as well as Al-5wt%Si alloy. The effect of water flow rate and mold temperature on the optimum casting speed was in decreasing order.
차량용 FMCW 레이더의 탐지 성능 분석 및 신호처리부 개발
김상동,현유진,이종훈,최준혁,박정호,박상현,Kim, Sang-Dong,Hyun, Eu-Gin,Lee, Jong-Hun,Choi, Jun-Hyeok,Park, Jung-Ho,Park, Sang-Hyun 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.12
본 논문에서는 차량용 FMCW(Frequency Modulated Continuous Wave) 레이더의 도플러 주파수와 아날로그-디지털 변환기 비트 수에 따른 탐지 성능 분석 및 신호처리부 개발을 진행하고자 한다. 성능 평가를 위한 FMCW 레이더의 시스템 모델은 송신부와 수신부로 구성되어 있으며 채널은 가우시안 잡음 환경을 사용한다. 이론과 시뮬레이션을 통해서 시스템 모델을 검증한다. 수신부에서는 수신 신호와 기준 신호사이의 부정합으로 인한 주파수 오차가 발생하게 된다. 75cm의 분해능를 갖는 FMCW 레이더에서 도플러 주파수가 약 38KHz이하인 경우 탐지 성능의 열화가 발생하지 않음을 알 수 있다. 아날로그-디지털 변환기 비트에 따른 탐지 성능은 6비트가 최소의 비트로 결정될 수 있음을 알 수 있다. 그리고 FPGA를 이용하여 디지털 송신 파형 발생기를 위한 집적 디지털 신디사이저(Direct Digital Synthesis) 칩을 기반한 FMCW 레이더 신호처리부를 설계 및 구현을 진행한다. This paper analyzes the detection probability of FMCW (Frequency Modulated Continuous Wave) radar based on Doppler frequency and analog-digital converter bit and designs and implements signal processing part of FMCW radar. For performance evaluation, the FMCW radar system consists of a transmitted part and a received part and uses AWGN channel. The system model is verified through analysis and simulation. Frequency offset occurs in the received part caused by the mismatching between the received signal and the reference signal. In case of Doppler frequency less than about 38KHz, performance degradation of detection does not occur in FMCW radar with 75cm resolution The analog-digital converter needs at least 6 bit in order not to degrade the detection probability. And, we design and implement digital signal processing part based on DDS chip of digital transmitted signal generator for FMCW radar.
구안괘사에 대한 침구치료(鍼灸治療)와 침(鍼), 약(藥) 병용치료(竝用治療)의 비교 고찰
김칠갑,박상동,김경호,Kim, Chil-Gab,Park, Sang-Dong,Kim, Kyung-Ho 대한침구의학회 2001 대한침구의학회지 Vol.18 No.3
Objective : Many methods have been used for treatment of facial nerve paralysis. The purpose of this study was to evaluate the clinical difference between acupuncture therapy and acupuncture-oriental herb medicine therapy. Materials and Methods : From 05-01-2000 to 01-30-2001, 46 facial paralysis patients who were hospitalzed and treated more than five times at the Department of Acupuncture & Moxibustion of Dongguk University Bundang Oriental Medical Hospital were selected for two group. One group(A group) was treated by acupuncture therapy, the other group(B group) was treated by acupuncture and oriental herb medicine therapy. A group was composed of 15 patients and B group was 31 patients. Results and Conclusion : As the results of study, both acupuncture therapy and acupunture-oriental herb medicine therapy were usable for facial nerve paralysis treatment. But, we could not discover any available difference between acupuncture therapy group and acupuncture-oriental herb medicine therapy group.