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비컨노드 확장과 좌표공간 분해 기반 3차원 위치인식시스템
이호철(Ho Chul Lee),이동명(Dong Myung Lee) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.1B
본 논문에서는 실내환경에 적합한 3차원 위치인식시스템의 설계를 위해 비컨노드 확장 기반의 3차원 위치인식시스템을 제안하고 성능을 분석하였다. 또한 실제 이동노드가 위치한 좌표에 대한 오차를 각각 계산하여 제안하는 3차원 위치인식 보정알고리즘의 위치인식률을 분석하였다. 실험결과, 제안한 위치인식알고리즘을 적용한 3차원 위치인식시스템의 오차거리는 제안한 알고리즘을 적용하지 않은 경우에 비해 오차거리가 평균 0.47m 더 적은 것으로 나타났다. 그리고 천장을 기준으로 천장과 이동노드와의 거리가 1.5m 및 2.5m인 경우에 대해 각각 실험한 결과, 12개의 좌표에 대한 위치인식 평균 오차거리는 1.5m의 경우가 2.5m 경우 보다 0.38m 더 낮음을 확인하였다. 비컨노드 확장과 좌표공간 분해 기반의 3차원 위치인식알고리즘은 3차원 위치인식에서 센서의 조건과 성능차이로 인해 발생하는 서비스 품질의 저하를 향상시킬 수 있다. The 3-Dimensional(3D) localization system based on beacon expansion and coordinate-space disassembly for the design of the 3D localization system in indoor environment is proposed and the performance of the proposed system is analyzed in this paper. The localization ratio of the 3D localization system adapts the proposed algorithm is analyzed by the calculation of errors occurred in the coordinates that the mobile node locates. It is indicated that the average error distance of the 3D localization system adapts the proposed algorithm is less than that of the 3D localization system not adapts the proposed algorithm as 0.47m. The localization average distance error in 12 coordinates is indicated that the 1.5m case is less than 2.5m case as 0.38m by some experimentations under the condition that the distances between the ceiling and the mobile node are 1.5m and 2.5m measured from the ceiling respectively. It is seen that the 3D localization system based on beacon expansion and coordinate-space disassembly can improved the degradation of the quality of service that is caused by some conditions and performance differences in sensors.
이호철(Ho-Chul Lee),송성환(Sung-Hwan Song),윤용태(Yong-Tae Yoon) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
This paper proposes Direct Load Control(DLC) operation scheme using a bidding system and the methodology to value proper quantity decided by the DLC program, which is a kind of resources for stabilization of electricity market price during peak times by managing consumer electricity demand. Since DLC program in Korea is based on the contract with the customers participating in this program, it is difficult to anticipate voluntary participation. That is, incentive for participants in DLC program is insufficient. To cope with this point, it is necessary to develop a new market mechanism and market compatible operation scheme for DLC programs. DLC market mechanism is deemed to be equipped with iterative bidding system, independent operation from energy market, and interactive with bidding information on energy market. With this market mechanism, it is important to find the optimal operation point of DLC allowing for the factors of stabilizing the electricity market price and compensating DLC implementation. This paper focuses on the mathematical approaches for the bid-based DLC operation scheme and examines several scenarios for the following technical justifications: 1) stabilization of electricity market price during peak times, 2) elasticity of demand.
막성 사구체신염 혼자에서 스테로이드 치료 중 발생한 Kaposi 육종 치험
이호철 ( Ho Chul Lee ),김향 ( Hyang Kim ),박정식 ( Jeong Sik Park ),박현덕 ( Hyun Duk Park ),이규백 ( Kyu Beck Lee ),유재학 ( Jae Hak Yoo ),박찬필 ( Chan Phil Park ),박문향 ( Moon Hyang Park ) 대한신장학회 2003 Kidney Research and Clinical Practice Vol.22 No.1
Membranous glomerulonephropathy is a common cause of nephrotoc sundrome in adults. Kaposi sarcoma is a well-known entity with distinct clinical forms such as nodular cutaneous lesions, generalized lymphadenopathy and visceral involvement. Incidence of Kaposi sarcoma is greater in patients with immunosuppression, particularly those having undergone renal transplantation, but also in patients with other underlying disorders treated with immunosuppressive therapy, notably, corticosteroids. We present a case of Kaposi sarcoma in patient with membranous glomerulopathy during corticosteroid therapy. A 49-year-old man was admitted with a complain of facial and leg edema, 5-kg weight gain for 1 month and foamy urine. Kidney biopsy showed membranous glomerulopathy. We started corticosteroid therapy to the patient. Two month later, his 24 hrurinary protein was decreased to 2.1 g/day. But, the well defined, various-sized, purple-colored papules and plaque appeared on the both hands and feet. He underwent skin biopsy, which revealed abnormally proliferated and dilated vessels, vascular slits, spindle-shaped cells and extravasated erythrocytes in the dermis. The findings were in accordance with Kaposi sarcoma. So he received cryotherapy with discontinuing corticosteroid. Four months after cryotherapy, skin lesions were cleared leaving slight hypopigmentation and amount of proteinuria was preserved without definite aggravation.
다중 센서 및 다중 전술데이터링크 환경 하에서의 표적정보 처리 기법
이호철(Ho Chul Lee),김태수(Tae Su Kim),신형조(Hyung Jo Shin) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.2
This paper is concerned with a track management method for a naval combat system which receives the tracks information from multi-sensors and multi-tactical datalinks. Since the track management of processing the track information from diverse sources can be formulated as a data fusion problem, this paper will deal with the data fusion architecture, track association and track information determination algorithm for the track management of naval combat systems.
이호철(Ho-Chul Lee),황현숙(Hyun-Suk Hwang),이석철(Seok-Cheol Lee),김창수(Chang Soo Kim) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.2
최근 지구 온난화, 이상 기후 등의 영향으로 태풍, 해일, 홍수와 같은 자연재해가 빈번히 발생하고 있으며, 우리나라에서도 태풍매미, 대구지하철참사 등 다양한 자연재해와 인위재난 이후 위기관리를 보다 효율적이고, 과학적이며, 체계적으로 강화할 필요성이 제기되고 있으며, 특히 산업화, 정보화에 따른 유비쿼터스 정보기술을 활용한 실시간적이고 즉시적인 정보를 제공해 준다. 최근에 이러한 유비쿼터스 기술을 이용한 초고속 정보통신 인프라 기반으로 도시 서비스를 제시 하는 U-City모델을 선보이고 있으나 U-방재분야에 있어서는 지역 환경에 관한 문헌 자료, 기상청, 재해 관련 보고서 등을 통해 재해ㆍ재난을 대비하는 미흡한 부분이 적지 않다. 이에 본 논문에서는 유비쿼터스 센서 네트워크기반의 U-City 모델에 U-방재분야를 추가시킴으로써 보다 안전한 생활환경을 누리면서, 편리한 서비스를 제공받을 수 있는 모델을 제시하였다.