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GALIS 구조 기반 실시간 분산 위치 데이타 서버 구현
이준우,이운주,이호,나연묵,Lee, Joon-Woo,Lee, Woon-Ju,Lee, Ho,Nah, Yun-Mook 한국공간정보학회 2005 한국공간정보시스템학회 논문지 Vol.7 No.1
LBS 시스템 분야의 도전할 만한 과제는 이동 객체를 다루는 수준부터 수백만 개의 이동 객체를 처리할 수 있는 높은 신뢰도의 시스템 아키텍처를 구현하는 것이다. GALIS로 명명된 아키텍처는 각각 다른 지리적 영역과 시간적 영역에 연관된 레코드를 유지하는 다수의 프로세서로 구성된 클러스터 기반 분산 컴퓨팅 시스템 아키텍처이다. 이 논문에서는 실시간 분산 객체 프로그래밍과 실시간 분산 컴퓨팅 시스템 디자인을 지원하는 미들웨어 실행 엔진을 포함하는 TMO 프로그래밍 기법을 적용하여 GALIS의 주요 요소를 구성하는 위치 데이타 서버의 프로토타입을 구현했다. 본 논문에서는 실질적으로 위치 측위 정보가 발생하는 과정과 이런 위치 정보와 위치 관련 질의가 어떻게 처리되는지도 기술하였다. 몇 가지 실험은 분산을 통해 프로세서의 부하를 줄여주어 성능향상이 있음을 살펴볼 수 있었다. A challenging task in the LBS system engineering is to implement a highly scalable system architecture which can manage moderate-size configurations handling thousands of moving items as well as upper-end configurations handling distributed computing system architecture that consists of multiple data processors, each dedicated to keeping records relevant to a different geographical zone and a different time zone. In this paper, we explain a prototype location data server structuring major components of GALIS by employing the TMO programming scheme, including the execution engine middleware developed to support real-time distributed object programming and real-time distributed computing system design. We present how to generate realistic location sensing reports and how to process such location reports and location-related queries. Some experimental results showing performance factors regarding distributed query processing are also explained.
이준우,박범진 ( Joon Woo Lee,Bum Jin Park ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.1
This study was carried out to investigate working time, performance, and to predict performance that related to the factor of forest road in earth work using excavator. It was found that the real working time was 503 minutes in a day. The ratio of real working time and allowance per total working time was approximately 85.7% and 14.3% individually. The rate of soil movement(Sm) to net working time was 38.6%, and earth cutting(Ec) was 32.5% . According to performance analysis, performance of earth work using excavator(0.8㎥) in straight part was 1.4 times larger than curve part and rock work using excavator(0.8㎥) which had breaker in straight was 9.1 times larger than earth work using excavator(0.8㎥) which had bucket. Performance of earth work using excavator(1.0㎥) was 1.3 times larger than using excavator(0.8㎥) in straight and curve part. Working performance in earth work using excavator(0.8㎥) was influenced by the conditions of radius of curve, width of roadway, slope gradient. It is not influenced by diameter and number of root stock.
이준우,박범진,김재원,송태영 ( Joon Woo Lee,Bum Jin Park,Jae Won Kim,Tae Young Song ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.2
This study was carried out to investigate working time, productivity, and heart rate during thinning using chain saw in Japanese larch(Larix leptolepis) plantation site for analysis of physical work load, and to investigate maximal oxygen uptake of worker for analysis of maximal work capacity. The real working time was 366 minutes in a day ; about 192 minutes in the a.m., 174 minutes in the p.m.. The ratio of real working time per total working time was approximately 90%. The rate of moving(Mo) to real working times was 26.3, which was the largest one of work elements. Average maximal oxygen uptake, as an asset of personnel performance, was 2.42ℓ/min(46.5㎖/㎏/ min) . During the real working time, average productivity, the mean rate of increase of heart rate, and the mean work load index was 2.62㎥/hr, 93.2%, and 41.9%, respectively.
이준우(Lee Joon-Woo),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
The dominant heating system used in Korean residential apartment buildings is a hydronic radiant floor heating system, known as the Ondol system. The most widely used control strategy applied to this traditional hydronic radiant system is a simple on-off control that intermittently supplies 'hot water of a fixed temperature' at 'constant flow rate' to each room. But, the current problems with the aforementioned control are as follows: (1) since the control is based on one point measured temperature (usually a signal from a thermostat installed in a living room) in each dwelling unit, significant difference in temperatures between spaces(master bedroom, living room, bedroom1, bedroom2) can occur. (2) the most widely used residential water splitter has static valves, thus is not able to change the flow rate to each room depending on heating load of spaces. In other words, the ratio of flow rates to rooms is fixed after once constructed. (3) Due the aforementioned reasons, over-or under-heating can happen, leading to improper use of energy. Thus, the paper aims to investigate the difference in the system's performance between four control strategies.
직교 좌표 공간에서 로봇 팔을 위한 카테시안 시간지연제어기의 구현 및 실험
이준우(Joon-Woo Lee),정도진(Do-Jin Jung),정슬(Seul Jung) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
This paper presents the implementation of the time-delayed controller(TDC) for a robot manipulator in the Cartesian space. The time-delayed controller is usually implemented in the joint space due to the actual joint control implementation. However, when the Cartesian controllers are required such as force control applications, the TDC can be implemented in the Cartesian space since it requires only Jacobian. Experimental studies are conducted to demonstrate the performance of the Cartesian TDC and the difficulties of Cartesian TDC are addressed as the practical problem.