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.

주요국가의 교통부문 기후변화협약 대응 정책 동향 (Polices Trends for Countermeasure Climate Change in Transportation of Major Countries)

김용기(Yong-Ki Kim),이재영(Jae-Young Lee),이철규(Cheul-Kyu Lee),이영호(Young-Ho Rhee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5

The Climate Change has been emerged as one of the most important social and economic issues and is affecting our daily life. The Post-Kyoto Protocol aims to reduce GHG(Greenhouse Gas) emission and mitigate climate change. Under this protocol, developed countries which are classified as Annex I implements programmes and strategies confronting against the climate change. South Korea has set voluntary GHG reduction goal of 30% reduction compared to BAU(Business As Usual) in 2020 and prepares National GHG inventory system and Negotiated Agreements(NA) with industries. It will affect seriously to industry and transport sector and its obligation to reduce GHG emission will be strengthened gradually. Therefore, there will be large impact on industry structure. In Korea, various strategies against climate change are being prepared as researches of development of GHG emission reduction technologies and integrated GHG emission management system in transport sector. In this study, strategy on climate change in transport sector is proposed by being based on developed countries’ respond to climate change in transport sector.

개별 조명제어시스템의 재실자 행태 개선에 따른 에너지절감 효과 분석

김용기(Yong Ki Kim),엄지영(Ji Young Eum),김원욱(Won Uk Kim),이태원(Tae Won Lee) 한국퍼실리티매니지먼트학회 2017 한국퍼실리티매니지먼트학회지 Vol.12 No.2

The individual lighting control system, which minimizes unnecessary power consumption using the individual lighting switch, is one of the methods improving occupants’ behavior. This paper analyzed empirical effects of the individual lighting control system by improving occupants’ behavior in the office building. The Lighting energy consumption of four cases were compared, considering energy saving education, time tendency without educations and position of cleaning time. The effect of the individual lighting switch had improved in 10 months after the installation of the switch, but the effects of the switch fade out in next 5 years without energy saving educations. Moreover, about 8 percents of daily lighting energy consumption were saved due to moving cleaning time. The results emphasize the necessity of the periodic education for improving occupants’ behavior and the investigation of occupants’ pattern to save lighting energy.

배합 압축작업에 있어서의 동작 시간연구

김용기 ( Young Ki Kim ) 한국경제학회 1962 經濟學硏究 Vol.10 No.1

In this thesis I tried to research a motion and time study in mixing and pressing operation of a manufacture in Korea. On this thesis I would like to summarize as follows: (1) The motion and time study have been found as an important element, also in the under-development of industrial management in our country, therefore we are in a position to suggest several important policies for the improvement to the management, according to the research of this kind. (2) A general, instead of partial, observation is needed in order to determine the base time of the operation in this kind of enterprise. The general observation is an average of the observations on every specific time-usually one hour-through all operating time in a whole day. (3) The base time of the pressing operation was observed as follows: the average one: 5.69 second the longest one:6.28 second the shortest one: 4.53 second (cf. table 27) (4) The average allowance percentage of the pressing operation was observed as follows: Job allowance: 18.5% Personal allowance: 1.0% Fatigue allowance: 5.7% Process allowance: 26.1% Total allowance: 51.3% The longest one was 84.5% and the shortest was 40.0% in total allowance percentage. (cf. Table 128) (5) Both the base time and the allowance percentage of the operation in night time was a little longer than in day time operation.(cf. Table 17. 18. 19. 139. 141. 142) (6) If the incentive wage plan will be adopted, and the operation will be improved by determining the standard time and the task according to this time study, the products will not be decreased even though the labour time would be shortened to a certain extent, and therefore they will able to promote the operation and good effects to both of employee and employer.

독자모델 감속구동장치 최적유량 선정에 관한 연구

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.

LCA 연구동향과 활용방안 사례

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.

DC전철구간의 회생인버터시스템 개발

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.

전동차 환경성 진단을 위한 DB구축 방향

김용기(Kim Yong Ki),이재영(Lee Jae Young),윤희택(Yoon Hee Tak),천윤영(Chun Yoon Young) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

The sustainable development is a key issue in the field of economy, culture and society. The national environmental production system has been established to reduce environmental impact and to foster the environmental-friendly industry. Recently, life cycle assessment (LCA) has been applied to evaluate the environmental performance of a product through its life cycle from resource to disuse. The LCA method can be utilized effectively to improve environmental problems and to prevent contamination instead of end-of-pipe treatment. The railway is the most environmental-friendly transportation system compared to others. However, the effort to minimize the environmental impact of railway should be continued to keep its role as core public transportation. For electric motor units (EMUs), their demand will be increased continuously due to their speed and punctuality. In this research, life cycle inventory (LCI) database was established for main parts of EMU to assess and improve EMUs’ environmental performance. The main materials with each part of EMU were chosen and simplified LCA was performed to evaluate environmental impact quantitatively. All of results in this study were based on 1 car of T-car (bogie, car-body and interior panel). This research provides not only the result of LCA for each phase but several functions such as automatically computing of total weight, comparing environmental index and assessment results according to impact categories, figuring out some key issues and preparing a report the results.

상황인식 처리를 위한 미들웨어 및 컨텍스트 서버의 설계 및 구현

김용기(Yong-Ki Kim),김영국(Young-Gug Kim),심춘보(Choon-Bo Sim),장재우(Jae-Woo Chang),김정기(Jeong-Ki Kim),박승민(Seung-Min Park) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1B

사용자를 중심으로 하는 주변환경과 사용자간 혹은 사용자와 장치간의 상호 운용성을 지능적, 자동적으로 선택하여 지원해 줌으로써 사용자로 하여금 정보 획득 및 실행을 보다 용이하게 하는 상황인식 기술은 유비쿼터스 컴퓨팅 환경에서 가장 중요한 핵심 기술이다. 따라서, 본 논문에서는 유비쿼터스 컴퓨팅을 위한 상황인식 기반의 미들웨어 및 컨텍스트 서버를 설계 및 구현한다. 먼저 미들웨어는 블루투스(Bluetooth) 무선 통신 기술을 이용하여 이동성을 지닌 이동 노드를 발견하고, 컨텍스트 서버에 등록하여 해당 컨텍스트에 적합한 실행 모듈을 서비스하는 기능을 담당한다. 컨텍스트 서버는 주어진 원격 객체의 정보와 사용자의 현재 상태 물리적 환경의 상태 등의 상황 정보를 효율적으로 데이터베이스 서버에 저장하고 관리할 수 있는 기능을 수행한다. 마지막으로 응용 시스템을 통해 제안하는 미들웨어와 컨텍스트 서버의 유용성을 보인다.

철도교통부문 온실가스배출 관리체계 구축방안에 관한 연구

김용기(Yong-Ki Kim),이재영(Jae-Young Lee),이철규(Cheul-Gyu Lee),이영호(Young-Ho Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7

United Nations Framework Convention on Climate Change(UNFCCC) is one of the international environmental convention with the goal of stabilizing Greenhouse Gas(GHG) concent in the atmosphere and preventing potentially dangerous change in the earth's climate. The purpose of this convention is to reduce fossil fuel consumption and to prevent GHG emission. The Republic of Korea was one of the Annex-II parties submitted its national communication to the UNFCCC. As a developing county, there is no GHG emission reduction commitments made by South Korea during first commitment period(2008~2012). On the contrary, South Korea' status as an OECD member, joining in 1996, ranks 6th in GHG emission. Furthermore the rate of increase of GHG is first among OECD countries in year 2005. As a result, Korea will probably be incorporated into Annex-I in second commitment period (after 2013). So, Korea government established and announced Voluntary GHG Reduction scheme to reduce emissions of 4%(accounting for 30% reduction base on Business As Usual) from the 2005 level by the year 2020 for mitigation of reduction duty impact. In specific case of Korea, transportation section occupied almost 21% of total energy consumption and nearly 17% of total GHG emission at 2005, so systematic emission management is required. To do so, in this research, we focus on systematic way of GHG management system to handle GHG reduction duties in Railroad section.