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임재혁(Jae Hyuk Lim),한만희(Man-Hee Han),이준연(Jun-Youn Lee),박정순(Jeong Soon Park),엄윤용(Youn Young Earmme),임세영(Seyoung Im) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Prediction of warpage and residual stress in semiconductor chip devices play an important role in chip design. However, there are a few uncertainties in warpage prediction due to unknown patterning material properties, and moisture effect on polymer film. To estimate patterning material properties, we adopt a composite plate analysis and experimental techniques. and measure the warpage of chip after drying at about 250℃ for 30min to remove moisture. In 100㎛, 80㎛ chip cases, finite element analysis result shows a good agreement with measured values, but for 50㎛ and 60㎛ chip cases, there exist a substantial deviation from the measured values due to local deformation from imperfection and defects inherently embedded in the patterning layer and nonuniform bonding between PIcoating and silicon.
강판 마감형 조립식 벽패널 복사냉난방시스템의 냉난방 방열 특성 평가
임재한(Lim, Jae-Han),구보경(Koo, Bo-Kyoung),김성임(Kim, Sung-Im),송승영(Song, Seung-Yeong) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.2
Recently the radiant panel heating and cooling system has been regarded as an alternative of low temperature heating and high temperature cooling by applying the renewable energy sources to the heating and cooling of buildings. Especially this system can be used as HVAC system alternatives in super high-rise buildings for energy saving and thermal comfort. Also it can be possible to reduce the plenum space because the minimum ventilation air will be supplied into the space. This study focused on the evaluation the basic characteristics of thermal output in prefabricated steel wall panel system for radiant heating and cooling. In order to evaluate the thermal output according to both various supply water temperatures and supply water flow rates, three-dimensional dynamic heat transfer analysis was performed. As results, for the heating mode, thermal output increased by 26% with the supply temperature increasing by 5℃. The surface temperature of panels range within 1~3℃. For the cooling mode, thermal output decreased by 18.2% with the supply temperature increasing by 2℃. The surface temperature of panels range within 0.5~1℃ and it was shown the even temperature distribution.
차축발열검지를 위한 4픽셀 적외선 디텍터 광학계에 관한 연구
임재우(Jae-Woo Lim),최재식(Jae-Sik Choi),윤석한(Seok-Han Yoon),신진호(Jin-Ho Shin),임형태(Hyung-Tae Lim),곽수영(Soo-Young Kwak) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
현재 국내에 설치된 HBD(차축발열검지장치, Hot Box Detector)는 고속열차의 차축에서 발생하는 온도 검지를 위해 적외선을 이용한 비접촉 온도측정방식을 사용하고 있다. 비접촉 온도측정방식은 움직이는 사물에 대한 온도측정과 같이 접촉식 온도센서로 측정이 불가능한 환경에서도 온도측정을 가능하게 해준다. 본 연구에서 사용하는 적외선 디텍터는 총 4 개 픽셀로 이루어진 적외선 검지센서들을 사용하여 4개의 포인트에서 발생되는 3 ~ 5㎛의 파장대역의 적외선을 검지함으로써 온도를 측정한다. 적외선 디텍터를 사용하여 차축의 발열을 검지하기 위해서는 발열체에서 발생하는 적외선을 센서에 집중시켜 줄 수 있는 전용 광학계를 필요로 한다. 본 논문에서는 차축발열검지를 위해 4 개의 픽셀로 이루어진 적외선 디텍터를 위한 광학계의 개발에 관하여 소개하고자 한다. HBD(Hot Box Detector), which is installed in Korea, applies non-contact temperature measuring methods using infrared rays to detect the temperature emitted from the axle box of highspeed trains. The non-contact temperature measuring methods make it available to check the temperature that is impossible to measure with a contact temperature sensor like gauging the temperature of moving objects. The infrared detector used in this study utilizes the detection sensors that have total 4 pixels and measures the temperature by detecting the infrared light in 3 ~ 5㎛ wavelength band, which is generated in 4 points. Therefore, the dedicated optical system that is able to concentrate the infrared rays from heating elements on the sensors is required to detect the heat of axle box with the infrared detector. In this research, the development of optical system for 4-pixels infrared detector will be introduced to detect the heat of axle box.
실내외 베네시안 블라인드가 결합된 창호시스템의 일사획득계수에 미치는 영향
임재한(Jae-Han Lim) 한국생활환경학회 2010 한국생활환경학회지 Vol.17 No.5
Energy performance of glazing systems can be evaluated by U-value and SHGC(g-value, solar heat gain coefficient) through experiment and simulation. Normally the venetian blind has been used to obtain the comfortable day lighting environment and prevent the overheating due to the incident solar radiation. We can anticipate that the exterior shading device is superior to the interior shading device with regard to the cooling load reduction through the fenestration system by blocking the incident solar radiation. This paper aimed to evaluate the effect of interior and exterior venetian blinds on the SHGC of glazing system. SHGC was evaluated through the experiment and simulation. In results, the SHGC was different from each cases according to the location and slat angle of venetian blind. Also significant dependence on the intensity of incident solar radiation through the fenestration system was found in comparison of the SHGC according to the solar incident angle.
임재한(Lim, Jae-Han),송승영(Song, Seung-Yeong),구보경(Koo, Bo-Kyoung) 한국건축친환경설비학회 2011 한국건축친환경설비학회 논문집 Vol.5 No.4
Recently the radiant panel heating and cooling system has been regarded as an alternative of low temperature heating and high temperature cooling by applying the renewable energy sources to the heating and cooling of buildings. Especially this system can be used as HVAC system alternatives in super high-rise buildings for energy saving and thermal comfort. Also it can be possible to reduce the plenum space because the minimum ventilation air will be supplied into the space. This study aimed at evaluating the basic characteristics of thermal output in light-weight radiant wall panel heating system. For this purpose, the thermal output of several light-weight radiant wall panel types were analysed by 3D dynamic heat transfer simulation. According to the supply water temperature, composition of panel layers and panel dimension, the thermal output characteristics such as surface temperature distribution, temperature difference between supply and return water were analyzed. The results show that we should improve the heat storage performance of wall panel for better distribution of surface temperature and thermal comfort.
6가 크롬 처리를 위한 알루미늄 산화물을 함유한 재생 분말 폐기물의 적용
임재우(Jae Woo Lim),김태환(Tae Hwan Kim),강형식(Hyung Sik Kang),김도선(Do Son Kim),김한선(Han Seon Kim),조석희(Seok Hee Cho),양재규(Jae Kyu Yang),장윤영(Yoon Young Chang) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.3
본 연구에서는 알루미늄 산화물을 함유한 재생 분말 폐기물에 의한 Cr(VI)의 제거특성을 조사하였다. 가공하지 않은 폐기물의 유기물을 제거하기 위해 550℃에서 소성하여 재생 분말 폐기물(RPW)을 준비하였다. 수용액 상에서 Cr(VI)의 흡착 경향에 관한 연구를 위해 회분식 반응장치를 이용하여 pH 변화, 흡착 속도, 등온 흡착 실험을 4가지 다른 이온세기 화학종(NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-))의 존재 하에서 수행하였다. SO₄<sup>2-</sup>와 PO₄(3-)가 존재할 때는 전체 pH 범위에서 크롬의 흡착이 크게 감소하였다. 반면 NO₃-와 CO₃<sup>2-</sup>에 의한 흡착 방해의 영향은 SO₄<sup>2-</sup>와 PO₄(3-)에 의한 것보다 상대적으로 낮았다. NO₃-와 CO₃<sup>2-</sup>의 존재 하에 Cr(VI) 흡착은 pH 4.5에서 최대로 나타났다. 이온세기 화학종의 농도가 증가함에 따라 Cr(VI)의 흡착은 감소하였다. 이러한 결과를 토대로 할 때 RPW와 Cr(VI) 사이의 흡착은 외부배위권 착물을 통하여 발생되는 것으로 사료된다. RPW에 의한 Cr(VI)의 흡착은 2차 반응으로 잘 표현되었다. Langmuir 등온흡착식을 이용하여 pH 3에서 RPW에 의한 Cr(VI)의 최대 흡착량을 구한결과 NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-)가 이온세기 화학종으로 있을 때 각각 11.1, 10, 3.33, 5 mg/g으로 얻어졌다. In this research, the removal capacity of Cr(VI) by the reused powdered wastes (RPW) containing aluminium oxides was studied. As a pre-treatment process for the preparation of calcined wastes, calcination was conducted at 550℃ to remove organic fraction in the raw wastes. In order to study the adsorption trend of Cr(VI) ions from aqueous solutions, the pH-edge adsorption, adsorption kinetic and adsorption isotherm were investigated using a batch reactor in the presence of four different background electrolytes(NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-)). Cr(VI) adsorption was greatly reduced in the presence of SO₄<sup>2-</sup> and PO₄(3-) over the entire pH range. Meanwhile the inhibition effect by NO₃- and CO₃<sup>2-</sup> was relatively lower than that by SO₄<sup>2-</sup> and PO₄(3-). Cr(VI) adsorption was maximum around pH 4.5 in the presence of NO₃- and CO₃<sup>2-</sup>. As the concentration of background electrolytes increased, Cr(VI) adsorption decreased. This result mightly suggests that adsorption between the surface of RPW and Cr(VI) occurs through outer-sphere complex. Cr(VI) adsorption onto the RPW was well described by second-order kinetics. From the Langmuir isotherm at initial pH 3, the maximum adsorbed amount of Cr(VI) onto the RPW was 11.1, 10, 3.3, 5 mg/g in the presence of NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, and PO₄(3-), respectively.