• The Korean Publising Journal, Monthly
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• s.313
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• pp.12-12
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• 2001

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.10
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• pp.925-933
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• 1991

Caracteristics of cylindrical rectanyular patch microshtrip resonator are analyzed by cavity model. To minimize the error of resonant frequency due to fringing field, the resonant frequency is calcylated by the concept of effective dielectric constant. The transmisson type resonator operating at 3GHz is designed and manufactured. The measured data of the resonant frequency and reflection loss are 3.019Ghz and \ulcorner32.78dB respectively. These results nearly coincide with theoretical results.

• Proceedings of the Korean Fiber Society Conference
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• 1996.10a
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• pp.244-246
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• 1996

• Solar Energy
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• v.17 no.1
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• pp.47-58
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• 1997

The objective of this research was to investigate the enhancement of heat transfer by wire mesh in impinging air jet system at the potential core region. The first experiment was carried out without mesh between nozzle exit and flat plate and the second experiment was done with mesh between them. When mesh was installed in front of the plate, heat transfer has been Increased due to the acceleration between rectangular halls and divided small jet In case clearances are changed, heat transfer comes to maximum under the condition of C=1mm, irrespective of nozzle exit velocity and H/B. Also the average heat transfer enhancement rate of a flat plate with mesh has been increased about 44% at maximum under the condition of U=18m/s, H/B=2 and C=1mm, compared to the result of a flat plate without mesh.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2006.11a
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• pp.167-169
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• 2006

• The Science & Technology
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• v.28 no.10 s.317
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• pp.70-71
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• 1995

최근 구미에서는 과학연구분야에서 부정사건이 잇따라 드러나 정부차원에서 과학계의 비리 예방에 대한 논의가 한창이라는 소식이다. 이같은 연구비리사건은 우리나라에서도 종종 제기 됐던 문제인만큼 '강 건너 불'로만 여길 것은 아닌 것 같다. 연구비리에 얽힌 과학이면사를 3회 걸쳐 정리해 보았다 <편집자>

• The Science & Technology
• /
• v.28 no.8 s.315
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• pp.72-73
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• 1995

최근 구미에서는 과학연구분야에서 부정사건이 잇따라 드러나 정부차원애서 과학계의 비리예방에 대한 논의가 한창이라는 소식이다. 이같은 연구비리사건은 우리나라에서도 종종 제기됐던 문제인만큼 '강 건너 불'로만 여길 것은 아닌 것 같다. 연구비리에 얽힌 과학이면사를 3회에 걸쳐 정리해 본다. <편집자 주>

• The Science & Technology
• /
• v.28 no.9 s.316
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• pp.20-21
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• 1995

최근 구미에서는 과학연구분야에서 부정사건이 잇따라 드러나 정부차원에서 과학계의 비리예방에 대한 논의가 한창이라는 소식이다. 이같은 연구비리사건은 우리나라에서도 종종 제기됐던 문제인만큼 '강 건너 불'로만 여길 것은 아닌 것 같다. 연구비리에 얽힌 과학이면사를 3회에 걸쳐 정리해 본다.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2007.11a
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• pp.99-100
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• 2007

• Korean Journal of Heritage: History & Science
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• v.51 no.4
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• pp.84-107
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• 2018

Cheommojik is a pile cloth, a type of textile whose surface is covered with short piles. The term chaedam was used during the late Joseon dynasty to refer to pile cloth rugs, while the terms yoongjeon, dantong and yangtanja were used in the early twentieth century. Various documents, newspaper articles and photographs confirm that pile cloth rugs were used by the general public as well as the royal family from the late Joseon dynasty onward, and that there were domestic manufacturers of such rugs at that time. This study investigated six pile cloth rugs that were produced after the late Joseon dynasty, five of which feature Persian knots made of cut pile, the other being made with the loop pile method. The cut pile rugs are rectangular in shape and measure between 72-98cm by 150-156cm; and they are decorated in the middle with patterns of butterfly, deer, and tiger or the ten longevity symbols, and along the edges with patterns composed of 卍 symbols. The ground warp of all six rugs are made from cotton yarn, while the ground weft is made of cotton yarn on three pieces, wool on one piece and cotton and viscose rayon. The ground weft yarn from four pieces are Z-twist yarn made with two or more S-twist cotton yarn. Four to six colors were used for the pile weft, all being natural colors except for red. Two or more S- or Z-twist yarn were twisted together in the opposite twist for the pile weft, with the thickness determining the number of threads used. Six or more weft threads were used to make the start and end points of the rug; and the ground warp ends were arranged by tying every four of them together. For the left and right edges, three or more threads were wrapped together into a round stick-like form, and the second and third inner ground warps from the edges were stitched on to the wrapped edge. For the loop pile, loops were made in the direction of the warp; the ground warp and the ground weft may have been made with cotton, the pile warp with wool yarn. An analysis of the components of three rugs was conducted to determine which types of animal hair were used for the pile weft. Despite some inconclusive results, it was revealed that goat hair and fat-tailed sheep hair were used, raising the possibility that various kinds of animal fur were used in the production of pile cloth rugs. The six rugs examined in this study are estimated to have been made between the late 1800s and the early 1900s. Although the manufacturer of the rugs cannot be confirmed, we concluded that the rugs were produced in Korea after referring to the documentation of the domestic production of pile cloth rugs during the aforementioned period and the form and placements of the patterns on the rugs.