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최승열,주재범,김경숙,정회일 한양대학교 이학기술연구소 2002 이학기술연구지 Vol.4 No.-
적외선 흡수 분광법을 이용하여 경수 (H_(2)O) 속에 존재하는 수십 ppm 정도의 중수(D_(2_)O)를 정량하는 분석 방법을 개발하였다. 이 방법은 원자력 발전소의 경수로에서 동위 원소로 변형된 중수의 양을 정량하는데 이용될 수 있을 것으로 기대된다. Infrared absorption spectroscopy has been utilized to demonstrate its feasibility for monitoring the quatitative amount of heavy water at ppm level. This analytical method can be applied to measure the amount of heavy water in the light water cooling system of nuclear power plant.
차정열,김경석,김동춘,황충주 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.2
최근 사용되고 있는 세라믹 브라켓의 마찰력을 측정하고 비교하고자 실험군으로 3종의 세라믹 브라켓(Crystaline V(^®), Tomy, Tokyo, Japan; Clarity^(®), 3M Unitek, CA; Inspire^(®), Ormco, CA)을 사용하였으며 대조군으로 컴퍼짓 레진 브라켓(Spirit^(®), Ormco, CA)과 메탈브라켓(Kosaka^(®), Tomy, Tokyo, Japan)을 사용하였다. 활주 시 마찰력은 4개의 브라켓-교정선 경사(0°, 5°, 10°, 15°)에서 각각 측정되었으며 두 종의 교정선 [1. 스테인레스 스틸(Stainless Steel, SDS Ormco, Glendora, CA), 2. 베타-타이타늄(TMA, SDS Ormco, Glendora, CA)]이 사용되었다. 22mil 브라켓을 만능시험기기에 부착한 후 .021 × .025 크기의 교정선에 고무결찰한 후 34℃의 건조상태에서 5mm/min 속도로 교정선을 활주시켰다. TMA 교정선은 스테인레스 스틸 교정선보다 높은 마찰력을 발생시켰으며 모든 브라켓 호선과의 조합에서 브라켓-교정신의 각도가 증가함에 따라 정적, 동적 마찰력이 증가하였다. 0°~5° 구간에서 마찰력의 크기는 스테인레스 스틸 교정선과 레진 브라켓 조합이 가장 낮게 측정되었으며 다음으로 Crystaline V, 금속 브라켓, Clarity, Inspire의 순으로 나타났다. TMA 교정선에서는 Crystaline V와의 조합이 가장 낮은 마찰력을, 다음으로 컴퍼짓 브라켓, Clarity, 금속 브라켓, Inspire 순으로 나타났다. 5° 이상에서 마찰력이 급격하게 증가하였으며 스테인레스 스틸 교정선에서 레진 브라켓, Clarity, Crystaline V, 금속 브라켓, Inspire순으로 나타났다. TMA 교정선에서는 레진 브라켓, Crystaline V, Clarity, Inspire, 금속 브라켓 순으로 나타났다. 이때 호선 브라켓 조합에 대한 마찰력은 일반적으로 증가하였으나 마찰력 증가율의 차이로 인해 그룹간 마찰력의 순위가 서로 뒤바뀌는 경우가 관찰되었다. 실리카-삽입 세라믹 브라켓은 기존의 세라믹 브라켓보다 낮은 마찰력을 보여줄 뿐 아니라 브라켓-교정선의 경사도의 증가에서도 비교적 낮은 마찰력 증가율을 나타내어 세라믹 브라켓의 높은 마찰력을 감소시키는데 큰 역할을 할수 있다고 생각된다. The purpose of this study was to measure and compare the level of frictional resistance generated from three currently used ceramic brackets; 1, Crystaline V^(®), Tomy International Inc., Tokyo, Japan; 2, Clarity^(®), 3M Unitek, Monrovia, CA, USA; 3, Inspire^(®), Ormco, Orange, CA, USA; with composite resin brackets, Spirit^(®), Ormco, Orange, CA, USA; and conventional stainless steel brackets Kosaka^(®), Tomy International Inc., Tokyo, Japan used as controls. In this experiment, the resistance to sliding was studied as a function of four angulations (0°, 5°, 10°, and 15°) using 2 different orthodontic wire alloys: stainless steel (stainless steel, SDS Ormco, Orange, CA, USA), and beta-titanium (TMA, SDS Ormco, Orange, CA, USA). After mounting the 22 mil brackets to the fixture and .019 × .025 wires ligated with elastic ligatures, the arch wires were slid through the brackets as 5 mm/min in the dry state at 34℃. Silica-insert ceramic brackets generated a significantly lower frictional force than did other ceramic brackets, similar to that of stainless steel brackets. Beta-titanium archwires had higher frictional resistance than did stainless steel, and all the brackets showed higher static and kinetic frictional force as the angulations increased. When the angulation exceeded 5°, the active configuration emerged and frictional force quickly increased by 2.5 to 4.5-fold. The order of frictional force of the different wire-bracket couples transposed as the angle increased. The silica-insert ceramic bracket is a valuable alternative to conventional stainless steel brackets for patients with esthetic demands.
일 도농복합지역 저소득층 노인의 건강문제 분석 : 보건소 방문간호사업 대상자 중심으로
고일선,,이태화,이경자,이정렬,임미혜,천의영,주윤미,이계철 노인간호학회 2005 노인간호학회지 Vol.7 No.2
Purpose: The purpose of this study was to analyze the health problems of low-income aged with chronic illness living in urban-rural composite area. Method: The sample consisted of 440 aged who were receiving home care services from a public health center. MDS-HC was applied to analyze the health problems of the aged. Data were collected through a face- to-face interview by six trained interviewers from June 28 to July 15, 2004. Result: Subjects had average number of 8 health problems in both urban and rural area. Lack of preventive health care measure, pain, and visual function were the most frequent health problem. The rural aged had more pain, bowel management problems, compared to the urban aged having more urinary incontinence and indwelling catheter. There were many health problems related to falls and pressure ulcers with middle-old aged in urban, and old-old aged in rural area. Conclusion: The results of this study showed strategies for care intervention of low-income elderly to put in practice. Therefore, tailored-service for each subject should be provided.
Chung, Kyung-Yul,Song, Young-Hoon,Oh, Sang-Hoon The Korean Society of Marine Engineering 2003 한국마린엔지니어링학회지 Vol.27 No.5
Combined De-NOx Process in which $NH_3$ SCR (Selective Catalytic Reduction) and non-thermal Plasma Process are simultaneously used, has been investigated with a pilot test facility. The pilot test facility treats the combustion flue gases exhausted from a diesel engine that generates 240 kW of electrical power. Test results show that up to 80 % of NOx (NO and NO2) can be removed at 100 - $200^{\circ}C$. None of conventional De-NOx techniques works under such low temperature range. In addition to NOx. the Pilot test results show that soot can be simultaneously treated with the present non-thermal plasma technique. The present pilot test shows that the electrical power consumption to operate the non-thermal plasma reactor is equivalent to 3 - 4 % of the electrical power generated by the diesel engine.
전력설비 감시용 무선센서네트워크 Front-End Node 구동프로그램에 관한 연구
정경열(Kyung-yul Chung),박창대(Chang-dae Park),임병주(Byung-ju Lim),한정은(Jeong-eun Han),이후락(Hoo-rock Lee),최대석(Dae-seok Choi),류길수(Keel-soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In the corona discharge detection system for electric power equipments, we propose suitable control method for the application of efficient wireless sensor networks. It is the POSIX standard lightweight thread which is each TCP and RF transceiver function for minimize load on the system. In addition, we have applied for mutual exclusion technique to the program, the data transmission rates increase and the prevent collisions between the data communication. The program consists of a clustered END nodes and the FRONT-END node that lab test was performed.
정경열(Kyung-yul Chung),박창대(Chang-dae Park),이후락(Hoo-rock Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In the power plant, the integrated condition monitoring technology is emerging part of a machine technology convergence with information technology. In this paper, we will present the state of today's new IT convergence technology for power plants.
지중배전선의 부분방전 원격감시 시스템의 구성과 서버의 역할
정경열(Kyung-Yul Chung),김진영(Jin-Young Kim),이수태(Soo-Tae Lee),최대석(Dae-Seok Choi),김용식(Young-Sik Kim),이후락(Hoo-Rock Lee) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
This paper is the result of on-going research & development of partial discharge remote monitoring system of underground power distribution line, which is installed in the central area of a city. To set up Remote Monitoring System with effective component parts, the Remote Monitoring System on partial discharge is designed as following scheme. The system begins with the operation of sensor equipped at the manhole or some defined spots of underground electricity roadway to precisely measure the signal of partial discharge from the power distribution line. The signals of partial discharge measured at the sensors are analyzed & assorted in the local control unit and transferred through the wireless communication network to the system server. the role of server in this system is considered to enable the measured and analyzed signals at the local control unit to be displayed and to monitor the acquired data, trend, PRPD/PRPS, and in addition, to make conclusions by diagnosis algorithm for using the various data at real-time as well as to classify all accumulated data in database.
프리넬렌즈를 이용한 Ⅲ-Ⅴ족 CPV 단위 모듈의 야외 성능시험에 관한 연구
정경열(Kyung-yul Chung),서현수(Hyun-soo Seo),강성원(Sung-won Kang),임재우(Jae-woo Lim),심상용(Sang-yong Sim),김용환(Yong-hwan Kim),김용식(Yong-sik Kim),박창대(Chang-dae Park),임병주(Byung-ju Lim),이후락(Hoo-rock Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
Recently, developments in the solar technology with Ⅲ-Ⅴ concentrating photovoltaic cell technology has much attention in the market. In this paper, we propose the concentrating photovoltaic module packaging method with fresnel lens and verify test for performance by using the 2-axis solar tracker for concentrating photovoltaic system in the out-door.