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Noh, Jac-Kyou;Oh, Dae-Kyun
- Journal of the Korean Society of Marine Environment & Safety
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- v.17 no.3
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- pp.275-281
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- 2011
One of the major technology issues in the ship production processes is the curved hull forming process that is a bottle neck and performed by experienced workers. In order to automate the curved hull forming process, there are a lot of attempts to develop the automation system by many shipbuilding companies and academic labs. However they have some problems which put the developed system in the difficulties to be used and maintained in the yard. In this paper, the problems are formed and solved by using tailored Systems Engineering Process which consists of four steps, those are requirement definition, system design, implementation of subsystem and components, and system integration and verification. A prototype for the proposed system development methodology is implemented. From the consideration of the prototype implemented, it is verified that this methodology can be an alternative to solve the problems.
https://doi.org/10.7837/kosomes.2011.17.3.275 인용 PDF KSCI

김문식
- Food Industry
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- s.17
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- pp.45-49
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- 1973
세계적으로 식량사정이 가장 궁색했던 73년도 이제 저문다. 언제나 식량은 생산과잉상태에서 곡가는 침체하기 마련이라는 예상은 언제나 드러맞는 것 같지는 않다. 올해 식량은 수요를 따르지 못하여 국제적곡가시세는 대체로 100$\%$를 상회하는 폭등세를 보였다.
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Jung, Sung-Soo;Lee, Weon-Hee
- Journal of the Korean Wood Science and Technology
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- v.27 no.3
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- pp.17-22
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- 1999
The effect of microwave irradiation on wood bending was investigated in this study. The specimens irradiated with microwave were bent around a form by using pedestal-steel and clamps. The specimens, korea red pine (Pinus densiflora), for this test were water-soaked for 78 hours. Saturated specimens were boiled in water for an hour. The size of specimens was 350mm(L) by 20mm(R) by 10mm(T). These specimens were heated by microwave of 2,450MHz. The most suitable time for microwave irradiation seems to range from 60 to 90 seconds. Wood moisture content decreased remarkably with the increase of irradiation time. When a softened wood piece is bent, its convex side was stretched while the concave side was compressed. It can be compressed considerably, but stretched very little. Therefore the failure will be governed by the tensile breaking strain and occur mainly on the convex face. So we obtained results from three different bending process methods as follows : 1) When bending with a pedestal-steel, convex face had not tensile breakings, but concave face had compression fails. 2) When bending with a clamp, bending time increased more than pedestal-steel and occurred tensile breaking. 3) Bending with a pedestal-steel and a clamp was found to be the most excellent operation method in this study.
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