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RISS 인기검색어
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- 저자 : 윤지훈(Yun, Ji-Hun) (검색결과 84 건)
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이중 무선 인터페이스 결합 시스템을 위한 적응적 인터페이스 활성화 기법의 성능 분석
윤지훈,Yun, Ji-Hoon 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.8
스마트폰을 비롯한 최신의 사용자 단말은 대체로 복수 개의 무선 인터페이스를 갖는다. 이러한 복수 개의 무선 인터페이스를 결합하여 동시에 사용함으로써 데이터 전송 속도를 향상시킬 수 있다. 하지만, 이 경우 각 인터페이스가 전력을 소모하므로 단말의 총 소비 전력은 매우 클 수 있다. 본 논문에서는 이중 무선 인터페이스를 결합하여 사용 시 단말의 버퍼 상태에 따라 무선 인터페이스를 적응적으로 활성화시키는 기법의 성능 모델을 마코브체인을 이용해 도출한다. 도출된 성능 모델은 패킷 발생률, 딜레이 성능 요구 조건, 결합으로 인한 성능 손실 등 다양한 동작 환경 및 설정에 대해 전송 딜레이 성능과 전력 소모를 예측할 수 있게 한다. 모델을 통해 적응적 활성화 기법이 일정 이하의 낮은 트래픽 발생 상황에서 기존 대비 절반 정도의 전력 소모를 하는 것을 보인다. Today's smartphones and user devices are equipped with multiple radio interfaces increasingly. Aggregating theses multiple radio interfaces and using them concurrently will increase a user's communication speed immediately, but at the expense of increased power consumption. In this paper, we develop a mathematical performance model of an adaptive radio activation scheme by which a radio interface is activated only when needed for performance increase and deactivated otherwise. The developed model shows that the adaptive scheme reduces delay significantly and almost halves power consumption below a certain level of traffic input.
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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.
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궤도차량용 보조동력장치 발전기 냉각팬 유동특성에 관한 수치해석
윤지훈(Jihun Yun),정인국(Inguk Jeong),이중섭(Chungseob Yi),서정세(Jeongse Suh),이태의(Taeeui Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, Use of Auxiliary power unit(APU) is increasing by growing demand for improvement of insufficient electric power and installation of emergency generation devices in military tracked vehicles and civil markets. And the trend is that the units are demanded for smaller size, lighter weight and higher output power, etc to suit consumer demands. To achieve these, cooling system and heat transfer characteristic investigations becomes very important designing factor. This paper is performed to get a useful data of thermal characteristics in the engine room of APU by experimental study. As a results, the temperature distribution data and rotational speed variation obtained and they will serve as useful design data for performance improvement in APU.
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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.
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윤지훈(Ji Hun Yun),서정세(Jeong Se Suh),이중섭(Chung Seob Yi),정경택(Kyung Taek Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
A numerical study has been performed to investigate the effect of two types of heatpipe solar collector manifold, direct and indirect, on the outlet averaged temperature by using CFD. As a result, the outlet averaged temperature in the two type was almost same. And, the higher heat flux make the outlet averaged temperature go high in both types. Also, in direct type, the phenomenon that the working fluid was congested around the joint of the manifold and heatpipe was found.
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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°.
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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.
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진공관형 집열기 히트파이프 접촉방식에 따른 집열성능 비교
윤지훈(Ji-Hun Yun),정인국(In-Guk Jeong),이중섭(Chung-Seob Yi),정경택(Kyung-Teak Chung),서정세(Jeong-Se Suh) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
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 tube 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.
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