• KSCE Journal of Civil and Environmental Engineering Research
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• v.5 no.3
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• pp.137-144
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• 1985

This paper deals with the adjoint variable method in design sensitivity analysis that is essential to the structure optimization. The method is shown to be much simpler than the conventional method in structure optimization by applying it to the optimal design of finite dimensional structures. Design sensitivity analyses and their numerical solutions for the principal constraints, i.e., displacement and stress constraints under static loads are obtained. Furthermore, it is proved that optimization can be carried out efficiently by applying the optimization algorithm. Structure optimization problems of minimizing the volumes of the truss structures(finite dimensional structures) under the appropriate boundary conditions, loading conditions and constraints are considered.

• Transactions of the Korean Society of Mechanical Engineers
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• v.14 no.5
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• pp.1272-1281
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• 1990

A numerical study to predict the contamination behavior in a room being contaminated has been performed. The room with one inlet and three exits, which maintained same pressure at the ceiling, has been chosen as test model. Six sets of calculation have been performed, for one, two or three contamination sources of 1*10$^{-4}$ kg$_{c}$/s strength at two different velocities(0.2m/s, 20m/s). Numerical results show that the number the contamination concentration near the first source increased by every 20%-30% of the maximum concentration for each increase of the contamination source.e.

• Korean Journal of Logic
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• v.14 no.2
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• pp.105-121
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• 2011

The late professor Young-Jung Kim advanced a view that Existential Specification Rule (ES Rule) can be understood as a kind of polylemma. In arguing for this view, he also claimed that all propositions containing free variables are universal propositions. In this paper, I argue that his view on free variables incur numerous problems. Moreover, I introduce a new rule of inference called 'Universalized Conditionalization Rule' (UC Rule), so that I can show that his insight about ES Rule can be substantialized without an appeal to his problematic view on free variables. Finally, I show that ES Rule can be directly derived from UC Rule.

• Journal of the Society of Naval Architects of Korea
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• v.31 no.3
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• pp.154-164
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• 1994

In this study, to find an economical production method which yields welded built-up beams with high quality, simulation techniques and optimization method are used. At first, fabrication variables such as welding current, voltage and speed and heated depth and breadth are selected and fabrication cost of a built-up beam is expressed by these parameters, which is optimized under the constraints. As advanced studies, total production cost including the fabrication cost and the material cost of the beam is expressed by the fabrication and design variables, and optimized with the design constraints by the class rules. In addition, assuming that heating for straightening is impossible. the optimization method of multi-objective functions based on the weighting method is applied to obtain the compromised optimal solutions of the total production cost and the welding deformation.

• The Korean Journal of Mycology
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• v.42 no.1
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• pp.64-68
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• 2014

Up to date several mycoviruses including Lentinula edodes Spherical Virus (LeSV) have been reported. As fungal virus was spreaded by infested hypae and spores it could be important to use virus-free spawns to eradicate the mushroom virus disease in the culture farm. We tested the imported spawns of Lentinula edodes by PCR whether LeSV was infested them or not. The primer set targeting the RdRp gene of LeSV was prepared based on partial sequence of the LeSV genome. The RT-PCR analysis showed that 87 among 88 imported spawns of L. edodes were infested by LeSV.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.189-192
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• 2017

본 논문에서는 하이브리드라디오 서비스를 성공적으로 도입하기 위해 필요한 정책적 조건들을 제안한다. 하이브리드라디오는 그 UI(User Interface) 특성과 오디오 방송 콘텐츠 외 서비스 구현으로 인해 기존 지상파플랫폼 외 추가적인 플랫폼이 필요하며, 이들 플랫폼을 구축하고 운영하는 새로운 플랫폼사업자의 등장을 수반하게 된다. 콘텐츠공급자와 플랫폼사업자가 일치하던 지상파 방송 산업과 달리 콘텐츠사업자와 플랫폼사업자가 분리되는 산업에서는 소수 플랫폼사업자가 다수 콘텐츠사업자에 비해 협상력 우위에 서는 역학관계가 생기게 되고, 이런 게임의 룰에 익숙하지 않고 사업적 규모도 영세한 지상파라디오 사업자들은 힘겹고 불공정한 사업 환경 속에 던져지는 상황을 맞게 될 수도 있다. 따라서 플랫폼사업자와 콘텐츠사업자가 상생하면서도 경쟁의 효율을 높이기 위해선 정교한 정책적, 제도적 장치가 필요하다. 또 하이브리드라디오가 기존 라디오 산업 내 제로섬 경쟁을 넘어 전체 이용자 규모를 확대하고 이를 효과적으로 수익과 연결하기 위해서는, 하이브리드라디오의 기술적 특성이 수용자에게 의미 있는 편익이 될 수 있도록 하이브리드라디오의 사업적 가능성을 충분히 활성화할 수 있는 제도 개선이 필요하다. 마지막으로 급변하는 미디어 빅뱅 상황에서 유의미한 유효 기간 내에 하이브리드라디오라는 신규 콘텐츠 유통 플랫폼을 성공적으로 도입하기 위해서는 산업 플레이어 간 불필요한 오해를 줄여 무의미한 논란을 최소화해야 한다.

• Korean Journal of Plant Tissue Culture
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• v.28 no.1
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• pp.47-52
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• 2001

Bet A and Bet B genes related to salt resistance were introduced into Lycium chinense through high efficiencies of plant regeneration. The explants were precultured on the shooting medium which is consisted of MS medium added 1mg/L kinetin and 0.05mg/L IBA for 2 days. After pre-culture, they were immersed in LB media containing Agrobacteria tumefaciens harboring Bet genes, and cultured on the same medium. Putative transformants could be selected after cocultivation of the explants with Agrobacteria on the shooting medium supplemented with 30mg/L kanamycin. The presence of both Bet A and Bet B genes from the transgenic plants were confirmed by PCR amplification with the gene specific primers and subsequent PCR-Southern blot with labeled Bet genes probe. The expression of Bet A and Bet B genes in the transgenic plants were observed by RT-PCR method.

• Korean Journal of Plant Tissue Culture
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• v.27 no.6
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• pp.491-496
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• 2000

A RAG25 gene regulating flowering time was introduced into Codonopsis lanceolata through high efficiencies (ca. 90%) of plant regeneration. The leaf explants were immersed in YEP media containing Agrobacterium tumefaciens (pGA 1209) harboring RAG25 gene, and cocultivated for 3 days. After cocultivation, they were cultured in shoot inducing media (SIM), N2B2 (NAA 2 mg/L, BA 2 mg/L and kanamycin 20 mg/L) and N2B4 (NAA 2 mg/L, BA 4 mg/L and kanamycin 20 mg/L), and the putative transformants were regenerated. The introduction of nptII and RAG25 gene into Codonopsis lanceolata was confirmed by 0.7 kb and 0.6 kb bands from polymerase chain reaction and reconfirmed by Southern hybridization using PCR product of RAG25 gene.

• Journal of the Korean Society of Food Science and Nutrition
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• v.41 no.9
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• pp.1310-1314
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• 2012

Gastrointestinal digestibility of new proteins inserted in the food supply is a significant parameter for assessing the safety of GM foods based on the assumption that digestive stability is undesirable. In this study, we performed in vitro digestion of CP4EPSPS, a new protein, expressed in genetically modified (GM) soybean in order to evaluate its digestibility in three different ratios of simulated gastric fluid with preheating. Ratios of GM soybean to simulated gastric fluid were 2:2, 2.5:1.5, and 1.5:2 and preheating was conducted at $100^{\circ}C$ for 5 min. Electrophoresis and Western blotting were used to confirm changes in soybean protein patterns and CP4EPSPS gene expression after in vitro digestion. At ratios in which the amount of gastric fluid was equal to (2:2) or relatively higher than that of soybean (1.5:2), no CP4EPSPS (47.4 kDa) protein was detected after 15 seconds of simulated gastric fluid incubation, the earliest time interval evaluated. However, when the ratio of GM soybean to gastric fluid was 2.5:1.5, CP4EPSPS was detected in 5 min and gradually decreased according to time. After preheating, no CP4EPSPS protein was detected after 15 seconds under all conditions. From these results, we concluded that the digestibility of CP4EPSPS in simulated gastric fluid increased upon preheating. Accordingly, we suggest that it is important to account for the ratio of gastric fluid to GM food in in vitro digestibility assessment models of GM food.

• Journal of the Korea Computer Graphics Society
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• v.1 no.2
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• pp.254-261
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• 1995

지금까지 솔리드의 인식이나 복원 문제는 단면이나 삼면도에서의 다면체에 관한 것들이 대부분이다. 본 연구에서는 2면도로 표현된 도면을 이용하여 3차윈 솔리드 모델로 자동 복원하는 알고리즘의 제안으로, 주어진 2면도를 해석하고 이 2면도를 만족하면서 물체의 구성 조건에 모순되지 않는 입체 모델을 생성하는 방법에 관해서 논한다. 본 논문의 특징은, 첫째 두 면도간의 정합성을 고려하는 규칙(rule)을 도입하여 후보면의 수를 줄이고, 둘째, 면의 combinatorial search과정에서 면의 결정 규칙을 도입하여 탐색 후보면을 솔리드 생성에 사용되는 면과 사용하지 않는 허물체 요소로 미리 구분하는 과정을 통해 탐색 공간의 축소와 탐색 시간의 효율화를 이루는 것이다. 실험을 통하여 이 방법에 대한 유효성과 타당성을 확인한다.