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전력선통신기반 LED를 이용한 단거리 무선통신 시스템 개발에 관한 연구
윤지훈(Yun, Ji-Hun),김용갑(Kim, Yong-Kab) 한국정보전자통신기술학회 2010 한국정보전자통신기술학회논문지 Vol.3 No.1
본 연구는 전력선통신과 LED를 이용한 단거리 무선통신 시스템개발을 목적으로 하며, LED와 광센서를 이용한 광 송 수신기를 제작하고 송 수신부에 표시 장치 및 통신을 하기위한 컨넥터 등을 구성하였다. 실험 방법은 효율이 높은 LED를 선택한 후 광 센서를 통하여 나온 수신 데이터를 오실로스코프를 통하여 신호 및 파형을 관찰한다. 또한 가시광통신 프로그램을 이용하여 원활한 Data의 송 수신이 이루어지는가를 확인하였다. 이 실험을 통해 문제점을 보완하고 전력 손실에 대한 지속적인 연구 및 개선이 필요하다. This study is to develop power line communication and short-range wireless communication system using LED. I will create optical receiver and transmitter using LED and optical sensor and connectors for display device and communication in receiver and transmitter were created. Experiment method is to signal and waveform through oscilloscope date from optical sensor after chosen a highly efficient LED. In addition, reception and transmitter of smoothly data using visible light communication program were checked. I will compliment problems through this experiment and constantly study, improve on power loss.
산업용 Turbo형 송풍기의 Cutoff 각도에 따른 유동특성
윤지훈(Ji-Hun Yun),정인국(In-Guk Jeong),이중섭(Chung-Seob Yi),서정세(Jeong-Se Suh) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
This study aims to analyze the flow characteristics of turbo-fan which is applied to the industrial field. Numerical analysis has been carried out to investigate the pulsation behavior of exhaust air flown out turbo fan by rotating impeller with constant speed. Moving mesh technique is proved as time-accurate solution for the flow inside impeller. As numerical results come within the error range of 1% by comparing with theoretical results, the numerical analysis can be verified. Cutoff angle has large influence on the amplitude of pulsation and the least pulsation of flow can be generated by the cutoff angle of 20°.
윤지훈(Ji-Hun Yun),이중섭(Chung-Soeb Yi),서정세(Jeong-Se Suh),송철기(Chul-Ki Song) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
In this study, numerical analysis was conducted to understand the flow characteristics of lubrication system in a manual transmission installed in a commercial vehicle. Also, the analysis was conducted with the purpose of improving the heat and lubricative condition of the transmission. Discharging flow rates on each oil hole outlet according to various engine rotating speed and the length of oil hole branch was calculated. In conclusion, as engine rotating speed is high and the length of oil hole branch is long, the discharging flow rate is high by virtue of the centrifugal force. In addition, this study proposed data for optimal design of lubrication system in manual transmission for a commercial vehicle.
진공관형 집열기 히트파이프 접촉방식에 따른 집열성능 비교
윤지훈(Ji hun Yun),정인국(In guk Jeong),이중섭(Chung seob Yi),정경택(Kyeong teak Jeong),서정세(Jeong se Suh) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this study, it was compared collecting performance according to contact types between heatpipe and manifold of vacuum tube type solar collector. Between two types, direct contact type is better in collecting performance. On the other hand, Indirect type have advantage in maintenance. In the result of numerical analysis, As the temperature of heatpipe and flow rate of working fluid increased, difference of outlet mean temperature of two types became large. Also, it could be confirmed, as contact resistance between heatpipe and copper wall in indirect type increased, the difference increased too. Useful data in selection and design in vacuum tube type solar collector were proposed by the results of numerical analysis.
ATmega16 마이크로컨트롤러를 이용한 전력선통신용 가시광 무선통신 시스템 구현 및 수신 특성 분석
윤지훈(Ji-Hun Yun),홍근빈(Geun-Bin Hong),김용갑(Yong-Kab Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
This study is to solve problems of depletion of RF bandwidth frequency, confusion possibility, security that current wireless communications system have and is to confirm possibility of applying next generation network. To solve problems of current wireless communications system, visible light communications system for power line communications using ATmega16 Microcontroller is was realized and receiver property was analyzed. PLC exclusive chip APLC-485MA, Microcontroller ATmega16, 5pi bulb type LED and high flux LED, visible light receiving sensor LLS08-A1 were used for transmitter and receiver. Performance was analyzed by designed program and an oscilloscope. It was showed average 20% improved receiver rate rather than bulb type LED in the case of high flux LED through voltage change rate on communication distance and LED type of distance between 10 to 50 cm. The blue LED showed the best performance among measured LED types with above 10% of voltage decreasing rate. But As it gradually becomes more distant, the precise date was difficult to obtain due to weak light. To overcome these sort of problems, specific values such as changing conditions and efficiency value relevant to light emitting parts and visible light receiving sensor should be calculated and continuous study and improvements should also be accomplished for the better communications condition.