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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
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
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.
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.
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.
구리 · 알킬암모늄화합물계 목재방부제(ACQ)를 처리한 목재 중의 Didecyldimethylammonium Chloride (DDAC) 성분의 발색처리 방법 개발
이종신 ( Jong Shin Lee ),최광식 ( Gwang Sik Choi ) 한국목재공학회 2018 목재공학 Vol.46 No.3
To determine the depth of preservative penetration in ACQ treated wood, the degree of penetration of Cu was measured. In this study, we developed a DDAC coloring method to investigate the penetration depth of DDAC, which is one of the active ingredient of ACQ, into wood. The following conclusions were obtained. The DDAC component reacts with a 2′, 7′-dichlorofluorescein indicator and results in a deep orange color. This orange coloring reaction appears not only in DDAC solutions but also in ACQ treated wood tissues in which DDAC is present. It is possible to visually verify that DDAC has better wood penetration than Cu in the spruce, which is an refractory wood species, by the DDAC coloring method developed this study. In addition to the results, it is necessary to investigate the difference in penetration of Cu and DDAC for other wood species with poor preservative penetration.