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가돌리늄(Gd) 첨가에 따른 1A 등급 듀플렉스 스테인레스 강의 미세조직 및 파괴 특성 변화
임재한 ( Jae Han Lim ),정현도 ( Hyun Do Jung ),안지호 ( Ji Ho Ahn ),문병문 ( Byung Moon Moon ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.1
CD4MCU duplex stainless steel with gadolinium was fabricated as a neutron absorbing material by the air induction melting method. The gadolinium formed intermetallic compounds of Cu-Gd-Fe. There were no significant differences in hardness or ultimate tensile strength between experimental alloys. With the addition of gadolinium the yield strength of the cast alloy significantly increased, from 478.8 ± 11.6 to 514.2 ± 29.9 MPa, whereas elongation of the cast alloy decreased with the addition of gadolinium, from 26.0 ± 7.1 to 7.0 ± 2.5% due to the formation of gadolinium based intermetallic compounds.
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.
임재찬(Jae-Chan Lim),김재철(Jae-Chul Kim),한성호(Soung-ho Han),이수길(Su-Gil Lee) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
It’s essential to measure electrical signals of Korea tilting train ""Hanvit 200"" during operation, Because we neep to study operation characteristics of new electric train ""Hanvit 200"" and we want to develop diagnosis system of main circuit of Korea tilting train ""Hanvit 200"". So, we measure electrical signals for developing diagnosis system of ""Hanvit 200"" during operation. We measure voltage and current of the primary winding of main transformer and analyze them. In result, we know that each operation has specific waveform and frequency. In addition, we also measure are currents and are voltage and we know that arc of each situations has specific waveform of pattern.
임재한(Lim, Jae-Han),윤미숙(Yoon, Mi-Sook),송승영(Song, Seung-Yeong) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.6
Generally residential kitchen hood has been used to remove the airborne grease, combustion products, fumes, smoke, odors, heat, and moisture from the air by evacuation of the air and filtration. This ventilation equipment is containing a mechanical exhaust fan that hangs above the stove or cooktop in the kitchen. Previous research indicates that kitchen hood use is infrequent mainly due to the noise problem. To solve this noise problem, it is necessary to analyze the sound level and characteristics of sound spectrum at first. The purpose of this study is to analyze noise characteristics of residential kitchen hood and to evaluate the noise criterion according to the dB(A), PSIL, NC, and NR. For this, in-depth interview with questionnaire was conducted for the better understanding of current operation status of kitchen hood. And field measurements of noise level were conducted at 15 cases in residential building. In results, sound pressure level is around 51.1~66.2dB(A). Sound pressure level on each frequency is irregular in the lower range and gradually decrease in the higher range.
거주자의 건물에너지 절약을 위한 건축물 에너지 소비량 정보 구축 및 활용 전략
임재한(Lim, Jae-Han),진혜선(Jin, Hye-Sun),최보혜(Choi, Bo-Hye),김성임(Kim, Sung-Im),송승영(Song, Seung-Yeong) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.2
The purpose of this paper is to deduct the scheme of construction related to the building end-use energy consumption associated with domestic integrated management system for building energy by analyzing various building energy consumption statistics and database. Although building officials can be considered as a direct influencing factor to reduce building energy consumption, they are just given information related to the primary or total energy consumption like gas or electricity and it has been mainly used for national political purposes. In some countries, however, building energy consumption database or related statistics are given as a form of end-use energy units including space-heating, space-cooling, hot-water supply, ventilation, lighting etc. Furthermore, by constructing standard end-use energy database, real energy consumption could be compared with the standard one and building owners could be given some guidelines to reduce building energy. By doing this, we can take part in the building energy preservation spontaneously.
국내 공동주택의 에너지절약 설계기준 강화에 따른 냉난방설비 설계 기준 개선 방안
임재한(Lim Jae-Han),김성임(Kim Sung-Im),송승영(Song Seung-Yeong) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.3
Recently design standard for energy-saving in apartment buildings has been consolidated gradually on the basis of evaluation and certification standards of energy efficiency of buildings, the energy-saving policy of building at home and abroad. Performance criteria for thermal insulation as well as fenestration has been progressively enhanced, and performance criteria for ventilation and airtightness of the building have also been re-developed. Therefore, heating and cooling load characteristics of the apartment building can be changed. For the design of the upcoming heating and cooling equipment in apartment buildings, it is necessary to evaluate the heating and cooling load characteristics according to the design strategies for energy saving in apartment buildings. As a result, in this study, it is intended to use as a resource for analyzing the impact that the adoption of energy-saving design variables for each of the apartment buildings, to predict the heating and cooling load characteristics in the apartment building.