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Living lab 개념을 이용한 실내용 스마트 LED등 전력절감 효과 비교분석
유기한(Ki-Han Yu),권기태(Ki-Tae Kwon),염정덕(Jeongduk Ryeom) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.1
In this study, to verify the electromagnetic safety and power saving effect of indoor smart LED luminaire in apartment building where residents actually live, the living lab concept was used to measure and evaluate the electromagnetic wave, electric power and the actual condition of use by questionnaire. Smart LED luminaire consists of a microwave sensor module and a 0-10 step dimming module. First, the power density of the electromagnetic wave was measured by connecting the Horn antenna and the frequency analyzer. As a result, the maximum intensity was 3.23E-6 [W/㎡] at the lower part of the sensor. It was confirmed that the measurement result is safer than the human body maximum strength. Next, each 100 households equipped with smart LED luminaire and general LED luminaire were selected and the monthly average power per household was measured for four months. As a result, 209.6kWh and 204.6kWh were confirmed, respectively. In addition, the standby power of the household equipped with smart LEDs and general LEDs was measured and it was 8kWh and 6kWh respectively. As a result of a survey, to find the cause of more power consumption in smart LEDs, we found that only 38.7% of respondents use dimming function. Therefore, in order to improve usage of smart LED luminaire, it is essential to promote its convenience and make familiar User interface so even the elders can easily use.
김유한(Yu-Han Kim),이현동(Hyeoun-Dong Lee),유기호(Ki-Ho Yoo) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
연료전지차 및 하이브리드차용 전기구동시스템의 냉각성능은 차량의 동력성능을 보장하기 위한 중요한 요소이다. 각 단품의 성능 확보를 위해 냉각수를 허용 온도 이하로 관리해야 하며 이때 라디에이터 방열량과 냉각수 유량이 중요 변수가 된다. 본 논문에서는 현대자동차 연료전지차량의 모터, 인버터를 포함한 100㎾ 전기구동시스템의 최적 냉각 설계를 위하여 차량 주행모드에 따른 전기동력부품의 발열량을 이론적으로 산출하고, 시험을 통하여 냉각시스템의 성능을 검증하였다.
최대봉(Dae-Bong Choi),유기한(Ki-Han Yu),김수태(Soo-Tae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools recently. The important problem in this spindle is to reduce and minimize the thermal effect by motor and bearing. This paper presents the thermal characteristics analysis of a high speed motor spindle system consisted of angular constant ball bearings and built-in motor with oil-jet lubrication. The analysis of thermal characteristic of spindle is performed according to the oil-jet lubrication by using finite element method. This result can be applied to the design and manufacture of the high speed spindle.