• Membrane and Water Treatment
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• 제8권2호
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• pp.137-147
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• 2017

A water treatment utility in South Korea operates a large system of pressurized hollow fiber membrane (PHFM) modules. The optimal selection of membrane module for the full scale plant was critical issue and carried out using Risk-based Life Cycle Cost (RbLCC) analysis based on the historical data of operation and maintenance. The RbLCC analysis was used in the process of decision-making for replacing aged modules. The initial purchasing cost and the value at risk during operation were considered together. The failure of modules occurs stochastically depending on the physical deterioration with usage over time. The life span of module was used as a factor for the failure of Poisson's probability model, which was used to obtain the probability of failure during the operation. The RbLCC was calculated by combining the initial cost and the value at risk without its warranty term. Additionally, the properties of membrane were considered to select the optimum product. Results showed that the module's life span in the system was ten years (120 month) with safety factor. The optimum product was selected from six candidates membrane for a full scale water treatment facility. This method could be used to make the optimum and rational decision for the operation of membrane water purification facility.

• 한국응용곤충학회지
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• 제60권2호
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• pp.185-191
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• 2021

농림축산검역본부는 해외해충 연구를 위해 밀폐능력을 갖춘 검역해충실험동을 구축하였다. 연구실험실로써 검역해충실험동의 적합성을 확인하기 위해 파밤나방을 이용하여 해충사육, 연구, 밀폐기능을 검증하였다. 해충사육 기능검증에서 한 세대의 파밤나방 완성에 필요한 온도별 생활사는 25℃에서 32.2일이 소요되었으며, 알 부화율은 80%, 유충 용화율은 86.6%, 번데기 우화율은 90%로 조사되었다. 연구기능 검증에서 살포법과 침지법을 이용하여 2종의 살충제(풀룩사메타마이드와 히드라메칠론)에 대한 고도의 유충 감수성을 확인하였다. 밀폐기능 검증에서는 겨울 동안 수행된 검역해충실험동의 유출시험에서 외부에 설치된 성페로몬 트랩에 파밤나방 수컷성충이 포획되지 않아 성충 유출은 없었다. 본 연구결과를 바탕으로 해외해충에 대한 다양한 연구가 검역해충실험동에서 가능할 것으로 판단된다.

• Food Science and Biotechnology
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• 제17권1호
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• pp.216-218
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• 2008

The present study was designed to determine how the phytochemical genistein activates caspase-3 to cause cell cycle arrest and apoptosis. When human ovarian cancer SK-OV-3 cells were treated with $200\;{\mu}M$ genistein for 24 hr, cell growth decreased significantly (p<0.05). Conversely, genistein treatment significantly increased cytotoxicity (measured as lactate dehydrogenase release) under the same conditions (p<0.05). To elucidate the mechanism behind the induction of apoptosis by genistein, we studied the cell cycle and caspase-3 activation. When cells were treated with genistein, the population of cells in sub-G1 phase increased by 44.2% compared to untreated cells. Genistein caused decrease in precursor caspase-3, increase in cleaved caspase-3 and a significant increase in caspase-3 activity (p<0.05). Therefore, genistein may induce apoptosis via caspase-3 activation. However, high-dose genistein treatment must be viewed with caution because of its potential cytotoxicity.

• The Plant Pathology Journal
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• 제39권1호
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• pp.28-38
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• 2023

Plant viruses are responsible for worldwide production losses of numerous economically important crops. The most common plant RNA viruses are positivesense single-stranded RNA viruses [(+)ss RNA viruses]. These viruses have small genomes that encode a limited number of proteins. The viruses depend on their host's machinery for the replication of their RNA genome, assembly, movement, and attraction to the vectors for dispersal. Recently researchers have reported that chloroplast proteins are crucial for replicating (+)ss plant RNA viruses. Some chloroplast proteins, including translation initiation factor [eIF(iso)4E] and 75 DEAD-box RNA helicase RH8, help viruses fulfill their infection cycle in plants. In contrast, other chloroplast proteins such as PAP2.1, PSaC, and ATPsyn-α play active roles in plant defense against viruses. This is also consistent with the idea that reactive oxygen species, salicylic acid, jasmonic acid, and abscisic acid are produced in chloroplast. However, knowledge of molecular mechanisms and functions underlying these chloroplast host factors during the virus infection is still scarce and remains largely unknown. Our review briefly summarizes the latest knowledge regarding the possible role of chloroplast in plant virus replication, emphasizing chloroplast-related proteins. We have highlighted current advances regarding chloroplast-related proteins' role in replicating plant (+)ss RNA viruses.

• 대한조선학회논문집
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• 제50권2호
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• pp.104-110
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• 2013

In this paper, the design procedure and results for 'Residual Life Prediction System Considering Corrosion and Coating' are explained, which is one module of 'Life-cycle Management System of Ship and Offshore Plant's' Operation. This 'Residual Life Prediction System' has two main functions; one is residual life prediction function based on probability processing using corrosion measurement data of ship's major structural members, and another is rust rate prediction function based on visual image processing of inspection photos. The analysis of system user requirements and functions are introduced, and the structure and environment of the developed system are explained.

• 한국압력기기공학회 논문집
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• 제6권1호
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• pp.50-56
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• 2010

Fatigue has been known as a major degradation mechanism of ASME class 1 components in nuclear power plants. Fatigue damage could be accelerated by combined interaction of several loads and environmental factors. However, the environmental effect is not explicitly addressed in the ASME S-N curve which is based on air at room temperature. Therefore many studies have been performed to understand the environmental effects on fatigue behavior of materials used in nuclear power plants. As a part of efforts, we performed low cycle fatigue tests under various environmental conditions and analyzed the environmental effects on the fatigue life of SA508 Gr. 1a low alloy steel by comparing with higuchi's model. Test results show that the fatigue life depends on water temperature, dissolved oxygen and strain rate. But strain rate over 0.4%/s has little effect on the fatigue life. To find the cause of different fatigue life with ANL's and higuchi's model, another test performed with different heat numbered and heat treated materials of SA508 Gr. 1a. On a metallurgical point of view, the material with bainite microstructure shows much longer fatigue life than that with ferrite/pearlite microstructure. And the characteristics of crack propagation as different microstructure seem to be the main cause of different fatigue life.

• 한국태양에너지학회 논문집
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• 제33권2호
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• pp.50-55
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• 2013

On a plan for the Winter Olympics 2018, Korean government is in the process of the world's first use of ocean energy for the Olympic ice-rink. This technology will be applied to a seaside town and have possibility of an export industry. In this study, we researched facilities and system for P ice-rink that acts as a cultural center as well as a physical plant in Busan and provided the way that apply by seawater heat source. Also, existing system and seawater heat source system of P ice-rink was analyzed by the most commonly used life cycle cost analysis among economics methods. Such economics data for ice-rink using seawater will be utilized by a basic information.

• 한국응용곤충학회지
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• 제40권4호
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• pp.309-313
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• 2001

벼먹노린재(Scotinophara lurida)에 대한 생활사와 기주식물에 대한 연구를 1999년부터 2001년에 걸쳐 수행하였다. 벼먹노린재의 알은 엷은 회색의 란형이다. 약충은 5령까지 발육하고, 체색은 적갈색, 흑갈색 그리고 갈색으로 체장은 1.19~7.24mm이다. 성충은 암수 모드 검은색이며 체장은 각각 9.34, 8.47mm, 월동성충의 수명은 27.2일, 산란수는 30.7개이다. 각 태별 발육기간은 알기간이 4.3일, 약충기간은 45.8일이다. 기주식물로 확인 종은 총 9종이었다.

• 상하수도학회지
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• 제27권2호
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• pp.223-232
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• 2013

In this study, carbon emissions and energy consumption were evaluated to establish a design strategy which has low energy consumption and carbon emission production, by using life cycle energy (LCE) and life cycle $CO_2(LCCO_2)$ calculation methods in life cycle management(LCM) tools. After improvement design projects, the energy consumption and $CO_2$ emission were calculated and compared in three sewage treatment plants (STPs), which are A STP, B STP, and C STP. The reduction of carbon emissions was 28,020.1 ton $CO_{2-}e/yr$, 37,399.6 ton $CO_{2-}e/yr$ and 8,788.3 ton $CO_{2-}e/yr$, respectively. Production of energy was 792 TOE/yr, 1,235 TOE/yr and 1,023 TOE/yr, respectively. As a result, the estimation of energy and energy self-sufficiency was 5.1 %, 14.5 % and 23.5 %, respectively. The result of this study shows the LCM can be contributed to establish strategy for energy and carbon emission reduction in sewage treatment plants.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.700-701
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• 2015

Nuclear power plant construction project can be called essential to establish a systematic project management system compared to other construction projects, taking into account the size and complexity and safety. To develop into a project management system for the Korea situation with the ongoing construction of the nuclear power plant was directed to promote nuclear power project management. In this paper, we introduce a comprehensive project management system for nuclear power projects. Currently considering the nuclear life cycle design, construction, and was developed by considering the flow of information to operate, and test each step linkage. The systems in English were developed to meet owner's requirements for advancing into overseas projects. Another point is that the systems were developed by management module, so that functions of each area can be selectively applied. It is expected that the system will establish itself as one that can be used for the entire lifecycle of nuclear power plants through gradual and systematic establishment of necessary data.