Electronic Enclosure 의 냉각시스템 설계

이종신,이충구 ( Jong Shin Lee,Chung Gu Lee ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.2

Abstract_Roman Electronic components and electronic systems are rapidly shrinking in size while ther complexity and capability continue to grow at an amazing rate. This has produced a dramatic increase in the power density, resulting in rapidly rising te

유럽규격 시험방법에 의한 국산 유용 침엽수재의 천연 내후성 평가

이종신(Jong-Shin Lee),김영숙(Young-Sook Kim),김규혁(Gyu-Hyeok Kim),김경태(Kyung-Tae Kim),김윤희(Yoon-Hee Kim) 한국가구학회 2015 한국가구학회지 Vol.26 No.3

To evaluate the natural decay durability of valuable domestic softwoods which are used for preservative treatment in our country, we carried out decay test by European standard method. Of all test wood species, Japanese larch (Larix leptolepis) showed slightly high natural decay durability compared to other 4 wood species, Japanese red pine (Pinus densiflora), pitch pine (Pinus rigida), Japanese cedar (Cryptomeria japonica), and scots pine (Pinus sylvestris). However, all of evaluated domestic softwood species in this study caused high weight losses over about 30% in heartwood by test fungus, Poria placenta. We can hardly expect a good natural decay durability from these softwood species. According to the classification of the natural durability of European standard (EN 350-1), they are classified into “Not durable” or “Slightly durable”. Therefore, if using these softwoods as exterior materials, we must do preservative treatment to ensure durability.

세절 사무용 폐지를 적용한 탄성매트 평가

이종신(Jong Shin Lee),성용주(Yong Joo Sung) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5

The applicability of cut office waste paper as a raw material for manufacturing elastic mats for infants was evaluated in this study. The elastic mat samples were prepared by using the cut office waste paper and various polymer binders with different making conditions. The density of each mat sample was controlled by changing the amount of binder addition. The tensile strength increased with the increase of the sample mat density. From this result, it can be estimated that the physical adhesion between the waste paper and the urethane binder was established. The optimum density for the manufacture and material properties of the elastic mat is about 0.7 g/cm³. On the other hand, the elongation of the mat decreased when the mat density increased. The elasticity of the manufactured mat was equal to or superior to that of the ready-made plastic mats.

파라핀 왁스 처리 목재의 조직 내 왁스 분포 상태

이종신(Jong-Shin Lee),김진경(Jin-Kyoung Kim),박순(Soon Park),손기혁(Ki-Hyuk Son),윤선미(Seon-Mee Yoon) 한국가구학회 2021 한국가구학회지 Vol.32 No.4

After paraffin wax treatment with different wood species and treatment methods, the differences in the weight percent gain density and wax distribution of treated wood were investigated, and the following conclusions were obtained. Paraffin wax penetrates low-density wood better than high-density wood, and thus the weight and density of treated wood are greatly increased. The lumen of the cells of the wood treated with the heat replacement method in which the water in the wood is replaced with paraffin wax is filled with wax, which greatly affects the weight and density increase of the treated wood. After pressure treatment with paraffin wax, the decompressed wood leaves no wax in the cell lumen. It shows a thin coating pattern only on the cell lumen wall. Accordingly, the increase in weight and density is small compared to heat replacement treated wood.

구리,알킬암모늄화합물계 목재방부제 (ACQ) 유효성분의 목재 흡착 특성

이종신 ( Jong Shin Lee ),최광식 ( Gwang Sik Choi ) 한국목재공학회 2014 목재공학 Vol.42 No.4

ACQ 목재 방부처리 현장에서 약액의 농도관리에 필요한 기초 자료를 얻기 위하여 ACQ 약액을 회수하여 재사용하는 과정에서 일어나는 약액의 농도 변화, 처리 목재의 약제 흡수량 그리고 Cu (CuO로써)와 DDAC의 유효성분 비율변화 등을 조사하였다. 목재 수종은 낙엽송, 미송, 라디에타소나무를 사용하여 조사하였다. ACQ 약액을 회수하여 재사용하는 과정에서 재사용 횟수가 증가함에 따라 약액의 농도는 감소하였으며, 농도 감소경향은 유효성분의 종류별로 다르게 나타나 Cu보다는 DDAC의 농도 감소가 크게 나타났다. Cu의 농도감소는 처리 수종에 크게 영향을 받지 않았으나, DDAC의 경우에는 약액 흡수가 많은 수종에서 농도 감소의 폭이 크게 나타났다. 약액의 재사용 횟수에 관계없이 Cu의 목재 흡수량은 일정한 수준을 유지하였으나 DDAC 흡수량은 재사용 횟수의 증가와 함께 지속적으로 감소하였다. 약액의 재사용 횟수의 증가로 DDAC 농도가 감소하면 Cu의 흡수량이 증가하였으며, 이것은 처리 목재 내 흡착반응 과정에서 경쟁 관계에 있는 DDAC의 양이 감소함에 따라 상대적으로 Cu의 흡착량이 많아지기 때문인 것으로 판단하였다. In order to obtain basic data for concentration control of alkaline copper quat (ACQ) solution in wood preservative treatment, this study investigates the change of concentration and adsorption of treating solution and active ingredient, copper oxide (CuO) and didecyldimethyl ammonium chloride (DDAC), in the process of recycling of ACQ solution. Japanese larch (Larix leptolepis), Douglas-fir (Psedotsuga menziesii) and Radiata pine (Pinus radiata) were treated with ACQ solution. The active ingredient concentration of ACQ solution was decreased continuously with increase of recycling. There are differences between extent of concentration decrease of Cu (as CuO) and DDAC. DDAC was decreased more quickly and to a higher degree than Cu for all recycling. The extent of DDAC concentration decrease was remarkable than that of Cu for wood species. The amount of DDAC adsorbed into wood decreased with the increase of ACQ solution recycling, but adsorption of Cu was little difference regardless of recycling. The adsorption of Cu into wood increased as DDAC concentration decrease by recycling of ACQ solution. This is likely due to decrease of DDAC competition with Cu for the same reaction site in wood.

이충구(李忠求) 교수(敎授) 정년퇴임기념특집(停年退任紀念特輯) : Electronic Enclosure 의 냉각시스템 설계

이종신 ( Jong Shin Lee ),이충구 ( Chung Gu Lee ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2

Electronic components and electronic systems are rapidly shrinking in size while thr complexity and capability continue to grow at an amazing rate. This has produced a dramatic increase in the power density, resulting in rapidly rising temperatures and a large increase in the number of failures. The temperatures must be controlled on every component to ensure a reliable electronic system. If the operating temperatures become too high, electronic malfunctions may occur. This study is to show the method for designing electronic enclosure to withstand severe thermal environments, such as electronic equipments for excavator, ships, missiles etc. without failing.

탁도에 의한 구리ㆍ알킬암모늄화합물계 목재방부제(ACQ)의 농도 예측

이종신 ( Jong Shin Lee ),김경태 ( Kyoung Tae Kim ),최광식 ( Gwang Sik Choi ) 한국목재공학회 2016 목재공학 Vol.44 No.5

균일한 품질의 방부처리 목재 생산을 위해서는 방부약액의 농도관리가 필요하다. 아직까지 목재방부처리 현장에서 농도관리를 위하여 간편하게 방부약액의 농도를 측정할 수 있는 방법은 개발되어 있지 않다. 본 연구에서는 ACQ 목재방부제를 대상으로 비교적 손쉽게 측정할 수 있는 탁도를 이용하여 농도를 예측할 수 있는 방법을 검토하였다. 탁도가 현저하게 작은 알칼리성의 ACQ 약액에 20%의 인산 용액을 첨가하면 백색의 현탁 물질이 생성되며 탁도가 증가한다. 인산 용액의 최적 첨가량은 약액의 탁도가 최고치에 도달하는 pH 7 수준이며, 첨가량이 많아지면 약액의 산성화와 함께 탁도가 급격하게 떨어지고 약액은 투명해진다. ACQ 약액의 농도와 탁도 간에는 정(正)의 상관을 가지며 고도의 유의성이 인정되었다. 농도와 탁도로부터 유도된 회귀방정식을 사용하여 산출한 현장 채취 약액의 예측 농도 값과 적정법으로 측정한 실측 농도 값 간의 농도 차이에는 t 검정 결과, 유의성이 인정되지 않았다. 따라서 탁도와 회귀방정식을 이용하여 ACQ 현장 약액의 농도 관리가 가능할 것으로 예상된다. The concentration control of wood preservatives is necessary to produce a preservative treated wood having a uniform quality. Concentration measurement method of wood preservatives to be easily used in the field has not been developed yet. This study examined the way to estimate the concentration from turbidity of ACQ wood preservative that can be relatively easily measured by using a portable turbidity meter. The addition of phosphoric acid solution in an alkaline ACQ solution having a very low turbidity is created a suspension of the white substance and the turbidity suddenly increased. The optimum amount of addition of the phosphoric acid solution is until the pH of ACQ solution reaches 7, the turbidity of the ACQ solution reaches maximum value. Excessive addition of the phosphoric acid solution results in a turbidity decrease with acidification of the ACQ solution. Also ACQ solution becomes transparent. The high significance was recognized with positive correlation between the concentration and the turbidity of the ACQ solution. From the t-test, The significant difference between the actually measured concentrations and the concentrations predicted by the regression equation for industrial ACQ solutions was not recognized. Thus, it was possible to know that concentration prediction and control of industrial ACQ solution using the turbidity and a regression equation. Therefore, using the regression equation and turbidity is expected to be able to management the concentration of ACQ solution in the industrial field.

철도 폐침목의 크레오소오트유 잔류 및 재질 특성

이종신(Jong-Shin Lee),박종영(Jong-Young Park) 충남대학교 농업과학연구소 2010 농업과학연구 Vol.37 No.3

In order to develop effective recycling technologies of disused railway wood ties, wood properties and residual creosote oil of wood ties were investigated. Among the total 50 wood ties, 32 wood ties were identified as tropical hardwood tree, such as, Keruing ( Dipterocarpus spp.), Kempas ( Koompassia malaccensis), Kapur ( Dryobalanops spp.) Naytoh ( Palaquium rostratum), and so on. Disused wood ties showed mostly sound structure without degradation of cell walls by decay fungi. Disused wood ties showed high strengths of bending and compressive parallel to grain because degradation of wood properties was hardly occurred in use under exterior condition. Disused railway wood ties had relatively poor depth of penetration and residual of creosote oil because of refractory wood structures. These results suggest that disused railway wood ties may be useful as recycling wood wastes.

파라핀 왁스 처리 목재의 치수안정성

이종신(Jong-Shin Lee),김진경(Jin-Kyoung Kim),박순(Soon Park),손기혁(Ki-Hyuk Son),윤선미(Seon-Mee Yoon) 한국가구학회 2022 한국가구학회지 Vol.33 No.1

As a result of comparing the dimensional stability and water droplet contact angle of paraffin wax-treated wood with the conventional treatment technique, the heat replacement method, and the new technique, the pressure-vacuum method, the following conclusions were obtained. When treated with paraffin wax, radiata pine shows superior Reduction in water absorptivity (RWA) and Moisture excluding efficiency (MEE) compared to hard maple. The effect of paraffin wax treatment on Anti-swelling efficiency (ASE) and Anti-shrinkage efficiency (ASE), which are the criteria for dimensional stability evaluation, is higher in hard maple than in radiata pine. In the paraffin wax treatment, the pressure-vacuum method can obtain higher dimensional stability compared to the heat replacement method. A large droplet contact angle was formed on the surface of the pressure-vacuum wax treated wood. A relatively smooth wax layer was formed on the surface of the pressure-vacuum treated wood compared to the heat-replacement treated wood.

스카라 로봇 암의 최적화 설계 및 시뮬레이션

이종신(Jong Shin Lee) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.6

This study is concerned about the optimal design of the arm 1 and arm 2 in the SCARA robot. The mass and inertia moment of the arm 1 and arm 2 in a SCARA robot is greatly affected on the performance such as a cycle time, and torques loaded on 1<SUP>st</SUP> axis and 2<SUP>nd</SUP> axis. To reduce the mass and inertia moment, this study carried out optimal design by FEM analysis using parametric variables, which is a width, a height of the rib and a thickness of arm in the arm. The rib is adapted instead of reducing the thickness in the ann. And the simulation by computer was conducted on two given paths in X direction and Y direction. After optimal design, the result showed that maximum torque of 1<SUP>st</SUP> axis and 2<SUP>nd</SUP> axis reduced to maximum 9.5% on a given path.