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센서네트워크에서 시그니처 기반 데이터 집계를 이용한 이동객체 트래킹 기법
김용기,김영진,윤민,장재우,Kim, Yong-Ki,Kim, Young-Jin,Yoon, Min,Chang, Jae-Woo 한국공간정보학회 2009 한국공간정보시스템학회 논문지 Vol.11 No.2
현재, 센서네트워크 기술을 이용한 많은 응용들이 개발되고 있다. 이러한 많은 응용 가운데 이동객체 트래킹 기법은 중요한 이슈 중에 하나이다. 그러나 현재 이에 대한 연구는 많은 연구가 이루어지지 않은 상태이며, 존재하는 연구는 다음과 같은 2가지 문제점을 가지고 있다. 첫째, 이동객체의 트래킹을 위해 반복적으로 센서노드를 방문해야하는 오버헤드가 발생한다. 둘째, 여러 이동객체를 동시에 지원하지 못한다. 이러한 문제를 해결하기 위해 본 논문에서는 시그니처 기반의 효율적인 데이터 집계를 이용한 이동객체 트래킹 기법(SigMO-TRK)을 제안한다. 이를 위해, 첫째, 공간 필터링 방법을 이용하여 효과적으로 이동객체들의 궤적을 집계하기 위한 지역적 라우팅 계층트리를 구성한다. 둘째, 시그니처를 사용하여 효율적으로 모든 이동객체들의 궤적에 대한 트래킹을 수행한다. 또한, SigMO-TRK를 확장하여 주어진 질의에 대한 이동객체의 유사궤적을 검색한다. 마지막으로, TOSSIM 시뮬레이터를 사용하여 제안하는 이동객체 트래킹 기법이 기존의 트래킹 기법보다 에너지 효율성 측면에서 우수함을 보인다. Currently, there are many applications being developed based on sensor network technology. A tracking method for moving objects in sensor network is one of the main issue of this field. There is a little research on this issue, but most of the existing work has two problems. The first problem is a communication overhead for visiting sensor nodes many times to track a moving object. The second problem is an disability for dealing with many moving objects at a time. To resolve the problems, we, in this paper, propose a signature-based tracking method using efficient data aggregation for moving objects, called SigMO-TRK. For this, we first design a local routing hierarchy tree to aggregate moving objects' trajectories efficiently by using a space filtering technique. Secondly, we do the tracking of all trajectories of moving objects by using signature in a efficient way, our approach generates signatures to method. In addition, by extending the SigMO-TRK, we can retrieve the similar trajectories of moving objects for given a query. Finally, by using the TOSSIM simulator, we show that our signature-based tracking method outperforms the existing tracking method in terms of energy efficiency.
김용기(Yong-Ki Kim),이영호(Young-Ho Rhee),이재영(Jae-Young Lee),이철규(Cheul-Kyu Lee),임성수(Sung-Soo Lim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Along with response of the Climactic Change Convention the government is demanding a measuring and reporting system for green-house gas emission and energy consumption on the railroad sector in order to make a transition to a low carbon green railroad system. According to the plans to electric railway line and increase the number of electric rolling stock the electric consumption is increasing more than the consumption of diesel. Therefore the development of monitoring device for green-house gases became important issue. In this study we developed a prototype of the monitoring system for estimating electric consumption. This study is expected to make accurate GHG emission inventory and be used to have confidence of emission factor.
실리콘 웨이퍼 생산공정용 왁스 스핀코팅장치 내 기류 특성에 대한 3차원 전산유동해석
김용기(Yong-Ki Kim),김동주(Dong-Joo Kim),우마로프 알리세르(Alisher Umarov),김경진(Kyoung-Jin Kim),박준영(Jun-Young Park) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
Wax spin coating is a part of several wafer handling processes in the silicon wafer polishing station. It is important to ensure the wax layer free of contamination to achieve the high degree of planarization on wafers after wafer polishing. Three-dimensional air flow characteristics in a wax spin coater are numerically investigated using computational fluid dynamics techniques. When the bottom of the wax spin coater is closed, there exists a significant recirculation zone over the rotating ceramic block. This recirculation zone can be the source of wax layer contamination at any rotational speed and should be avoided to maintain high wafer polishing quality. Thus, four air suction ducts are installed at the bottom of the wax spin coater in order to control the air flow pattern over the ceramic block. Present computational results show that the air suction from the bottom is quite an effective method to remove or minimize the recirculation zone over the ceramic block and the wax coating layer.
김용기(Kim Yong-Ki),김주락(Kim Ju-Rak),한문섭(Han Moon-Seob),김준구(Kim Jun-Gu),양영철(Yang Young-Chul) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
when electric traction system used DC 1500V runs on decline of rail road track and slows down, dc voltage goes beyond regular voltage. In this case extra power is forcibly wasted by resister because rectifier of substation and electric train including power converter and so on are out of order. This paper described a DC electric railway system, which can generate the excessive DC power form DC bus line to AC source in substation for traction system. The purpose of this study was the development of the regenerative inverter system which suppress extra DC-line voltage and regenerate the energy instead of using a resister. That is Developed regenerative inverter system returns the regenerative energy from the DC line voltage to the utility. In addition, the inverter can be compensate the harmonics caused by the power conversion devices used in the DC traction system.
김용기(Kim Yong-Ki),윤희택(Yoon Hee-Taek),이재영(Lee Jae-Young),김진용(Kim Jin-Yong) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
To assure our competition in the stream of international society, nowadays, environmental policy can lead to favorably environmental economy and society. Using a LCA method is authorized as one internationally as one kind of decision factor to accomplish the target of sustainable development and environment policies. It is quick development scientifically and intentionally fair standard of assessment method for pursuing environmental friendly in environment regulation policy. This paper deals with the study trend of practical application of LCA by reviewing of the domestic and abroad.
김용기(Kim Young-Ki),차수덕(Cha Soo-Deok),김종연(Kim Jong-Youn),이민수(Lee Min-Soo) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper describes determination of optimal lubricant quantity for driving gear unit. The purpose of selecting optimal lubricant quantity is to evaluate durability of driving gear unit. Lubricant quantity of driving gear unit is important factor affecting durability. The determination methode of lubricant quantity evaluation is used calculation necessary lubricant quantity first, then selection of optimal oil quantity as a base for moving of oil temperature according to changing oil quantity.