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金熙山,李在坤 忠南大學校 1962 論文集 Vol.2 No.-
In general, the contraction of thread in a fabric can be determined by the following factors such as tension, ends or picks per inch, weaves, counts and turns per inch. In order to simplify the calculation we ignored the effects of tension and twists on contraction, and classified the fabric as follows: a) a square fabric b) a fabric whose angle of curvature of warp or weft proceeds the other. c) a fabric whose angle of curvature of warp or weft slightly differes from the other. Firstly, we determined the maximum possible density of warp or weft as follows: D=1/cosθ(de+df) where θ; angle of curvature de; dia. of warp df; dia. of weft D; maximum possible density of warp and weft. The results are as follows L = {I×C×(de+df)×n/D}×D/N where L; original length of warp or weft in a unit length of fabric. I; number of curvature in a repeat due to weaves. C; constant of angle of curvature. n; number of threads that continuously float in a repeat due to weave. And on the variation of tension during weaving we analysed the variation of tension due to three principal motion of loom and classified the nature of variation as follows; such as a) tension which varies continuously during weaving b) tension which varies intermittenly during weaving And summerized as follows; A) tension which varies according to shedding and beating motion varies intermittenly B) tension which added to the warpbeam increases by the decrease of warp beam dia. C) tension which varies according to letting off and taking up motion varies intermittently or continuously by the mechanism.
지역별 하천수에너지 부존량 및 이용가능성에 관한 조사연구
허재영,김산 대전대학교 산업기술연구소 1998 산업기술연구소 論文集 Vol.9 No.2
River water which is one of important unused energy resources has been utilized as cooling water in industrial factories for a long time. The temperature of river water is higher than air in the summer season and vice versa in the winter season. In addition, the river water temperature is relatively stable. From these features, the river water has been expected as alternative cooling and heating heat sources with the development of the heat pump techniques. To utilize the river water as heat source, it is important to establish the standard method for estimating the quantity of river water converted into energy and evaluate the available quantity accurately and on a realistical basis. In this study, the standardization of estimating method is attempted and then the quantity of unused energy of river water is estimated regionally and its energy saving effect and potential are discussed.
전병철,조응산,김재도 한국레이저가공학회 1998 한국레이저가공학회지 Vol.1 No.1
A new wide laser beam optical system for the laser materials processing has been developed with a polygonal mirror. It consists of polygonal mirror and cooling part that prevents the surface of rotating polygonal mirror from damage by heat. The polygonal mirrors have been designed and made as 24 and 30 facets in pyramid type. This system provides a uniform linear laser heat source with the surface scanning width from 15 to 50mm according to the scanning height. To examine the wide laser beam, He-Ne laser is used. Also, Acryl is used to confirm the laser beam pattern by bum-pattern print. to analyze the energy distribution of the wide laser beam, empirical values and theoretical values are compared and discussed. To improve the efficiency of the wide laser beam optical system, methods are suggested by the optical theories. For larger area processing like turbine blade, drawing roller, cold roller and guide plate, optimal overlapping locations have been calculated and analyzed by geometric and optical theories.
Kim, Hong-Il,Yoon, Jae-San,Kim, Hong-Bae,Han, Jae-Hung IOP Pub 2010 Measurement Science and Technology Vol.21 No.8
<P>A thermal deformation measurement system, composed of fiber Bragg grating (FBG) sensors for strain measurement and a displacement measuring interferometer (DMI) system for accurate specimen expansion data acquisition, was prepared and installed in a vacuum chamber where the temperature of the test specimen can be controlled to simulate space environments. The DMI system, which consists of two heterodyne interferometers, a laser head, electronics and a thermally stable specimen base made of fused silica, was used to validate the thermal expansions of the specimens measured by the FBG sensors. We measured the average coefficient of thermal expansion (CTE) of an Invar specimen, known as a thermally stable material, using both the FBG sensors and the DMI system in vacuum conditions from 20 °C to 40 °C. The CTE results of the Invar specimen were found to be 1.226 × 10<SUP>−6</SUP> K<SUP>−1</SUP> and 1.298 × 10<SUP>−6</SUP> K<SUP>−1</SUP> based on the FBG and DMI measurements, respectively. The present results show that it is possible to precisely measure the thermal deformation of a specimen or structure in space environments using FBG sensors.</P>
Poster Session 1 : Expression of Runx2 transcription factor in male reproduction system
( Jae Hwan Jeng ),( Jung Sook Jin ),( Hyun Nam Kim ),( Hyo Jin Kim ),( Youn Kwan Jung ),( Shin Yoon Kim ),( Byung Heon Lee ),( Tae Hwan Kwon ),( Rang Woon Park ),( In San Kim ),( Je Yong Choi ) 한국생화학분자생물학회 (구 한국생화학회) 2005 생화학분자생물학회 춘계학술발표논문집 Vol.2005 No.-