• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.202-202
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• 2017

Global climate change resulted in unwarranted change in global temperature and caused heat and cold stress, which are consider major threat to agriculture productivity around the world. The use of plant growth-promoting microbes is an eco-friendly strategy to counteract such stresses and confer tolerance to the plants. In current study, previously isolated endophytic fungi Preussia sp. BSL-10 has been found to produce phytohormones such as IAA and GA and as such, endophyte Preussia sp. BSL-10 found to induced tolerance against heat and cold stress. The results showed that under both heat and cold stress the plant growth parameter such as shoot, root length, shoot fresh weight and root fresh weight is higher in Preussia sp. BSL-10 treated plants as compare to free Preussia sp. BSL-10 control plants. In addition, the stress-sensitive endogenous ABA levels were significantly increased in Preussia sp. BSL-10 host plant. The current result suggest that the phytohormone-producing endophyte Preussia sp. BSL-10 can increase plant resistance toheat and cold stress, in turn improving agricultural productivity.

• 한국수소및신에너지학회논문집
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• 제35권1호
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• pp.105-113
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• 2024

The natural gas dehydration process plays a central role in liquefying LNG. This study proposes two natural gas dehydration process systems applicable to liquefied natural gas (LNG) liquefaction plants, and compares and analyzes energy optimization measures through simulation. The fuel gas from feed stream (FFF) case, which requires additional equipment for gas circulation, disadvantages are design capacity and increased energy. On the other hand, the end flash gas (EFG) case has advantages such as low initial investment costs and no need for compressors, but has downsides such as increased power energy and the use of gas with different components. According to the process simulation results, the required energy is 33.22 MW for the FFF case and 32.86 MW for the EFG case, confirming 1.1% energy savings per unit time in the EFG case. Therefore, in terms of design pressure, capacity, device configuration, and required energy, the EFG case is relatively advantageous. However, further research is needed on the impact of changes in the composition of regenerated gas on the liquefaction process and the fuel gas system.

• 원예과학기술지
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• 제32권5호
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• pp.721-729
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• 2014

본 연구에서는 소비자들의 주요 절화류에 대한 구매행동과 인식을 파악하여 시장을 예측하고, 소비 활성화 방안을 제시하고자 하였다. 설문조사를 전문 리서치 기관에 대행하여 실시하였고, 주요 절화류를 대상을 조사를 하여 컨조인트 및 군집분석을 하였다. 설문조사결과, 장미의 경우는 선택 속성별 중요도는 가격과 절화수명이 비슷하게 높았으며, 그 다음으로 화색, 화형의 순으로 분석되었다. 각 속성별 부분가치를 보면, 가격은 1000원, 꽃의 형태는 군집1의 남성의 경우만 빼고 여성 군집 2,3,4,5,6,7의 경우 모두 스프레이 형태의 장미를 선호하였다. 꽃의 절화수명에 대한 중요도는 높은 수준을 보여 모든 군집에서 7-8일로 나타났고 화색은 빨강색을 가장 선호하였다. 국화의 경우 선택속성별 중요도는 화색이 가장 높고, 그 다음으로 절화수명, 화형, 가격 순으로 분석되었다. 부분가치를 보면 가격은 1000원, 화형은 스탠다드, 절화수명은 16-20일, 화색은 노란색이 가장 높았다. 백합의 경우 선택속성별 중요도는 화형이 가장 높았고, 그 다음으로 절화수명, 가격, 화색 등의 순으로 분석되었다. 부분가치를 보면, 가격은 2000원, 화형은 대형을, 절화수명은 4-7일, 화색은 노란색이 가장 높았다. 주요 절화(장미, 국화, 백합)을 대상으로 컨조인트 분석 결과, 장미의 경우 가격과 절화수명이 가장 높게 나타났으며, 국화는 절화수명과 화색, 백합은 화형과 절화수명으로 나타났다. 주요 절화 모두 공통적으로 절화수명의 중요도가 높은 것으로 나타났다. 본 연구에서는 소비자 조사를 통해 주요 절화류에 대한 소비자의 선호 패턴을 분석하고 이를 근거로 소비자의 기호에 맞는 상품을 기획 생산하여 화훼류 소비 활성화 방안을 위한 기초조사 자료를 제시하고자 하였다.

• 한국전통조경학회지
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• 제31권3호
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• pp.38-44
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• 2013

칼 푀르스터(Karl Foerster)는 독일 정원문화 형성에 가장 큰 영향을 미친 인물로서, 새로운 소재의 선정과 정원을 보급하는데 크게 기여하였다. 특히, 재식설계의 관점으로 볼 때 최근 들어 유행하고 있는 자연식재의 계기를 만들었고, 현대에 사용되고 있는 그라스류를 이미 사용하여 디자인한 점 등 현시점에서 재조명해 볼 필요가 있다. 본 연구는 칼 푀르스터의 정원을 통해서 그의 재식설계방법과 역사적인 의의를 찾고자 하는 것이다. 연구의 결과를 요약하면, 첫째, 공간의 형식면에서는 기후와 시대적인 영향에 의해 선큰가든 스타일로 조성하였고, 자연스럽게 개방된 목초지와 양치류, 그라스류의 사용으로 자연식재의 유행을 선도하였다. 둘째, 소재의 사용은 다년초의 필요성을 주장함과 동시에 일반인들이 쉽게 재배할 수 있고, 추위에 잘 견디는 강한 식물의 다년초를 직접 육종하였다. 또한, 식물의 특징과 결합방식을 전시용 정원으로 조성하여 대중에게 알려주는 실험적인 방법을 사용하였다. 셋째, 재식설계의 미적 원칙은 색상과 계절에 집중하고, 파란색, 노란색, 흰색을 선호하여 델피니움, 루드베키아, 플록스 등의 신품종 개발을 하였다. 계절을 세분한 7계절에 대한 생각은 지금의 윈터가든을 조성하는 효시가 되었다.

• Nuclear Engineering and Technology
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• 제56권6호
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• pp.1989-2001
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• 2024

Artificial intelligence (AI) techniques are now being considered in the nuclear field, but application faces with the lack of actual plant data. For this reason, most previous studies on AI applications in nuclear power plants (NPPs) have relied on simulators or thermal-hydraulic codes to mimic the plants. However, it remains uncertain whether an AI model trained using a simulator can properly work in an actual NPP. To address this issue, this study suggests the use of metadata, which can give information about parameter trends. Referred to here as robust AI, this concept started with the idea that although the absolute value of a plant parameter differs between a simulator and actual NPP, the parameter trend is identical under the same scenario. Based on the proposed robust AI, this study designs an event diagnosis algorithm to classify abnormal and emergency scenarios in NPPs using prototypical learning. The algorithm was trained using a simulator referencing a Westinghouse 990 MWe reactor and then tested in different environments in Advanced Power Reactor 1400 MWe simulators. The algorithm demonstrated robustness with 100 % diagnostic accuracy (117 out of 117 scenarios). This indicates the potential of the robust AI-based algorithm to be used in actual plants.

• 한국토양비료학회지
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• 제48권1호
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• pp.15-21
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• 2015

The use of cover crops has a beneficial effect on sustainable soil management in pear orchards. We aimed to compare changes in soil chemical properties and biota with the use of different cover crops. We tested the effects of five cover plants, including hairy vetch, orchard grass, rattail fescue, rye, and perennial ryegrass. Use of different cover crops had a minimal impact on soil chemical properties through three year experiments. The aboveground biomass was greatest with the use of rye. The potential amounts of returnable N and P were highest when leguminous hairy vetch was used as a cover plant. Changes in the composition of the microbial community were investigated by phospholipid fatty acid (PLFA) analysis. Microbial PLFAs were highest with the use of rattail fescue and lowest with the use of hairy vetch. Minimal changes in the abundances of nematodes and microarthropods suggested that there was no bottom-up control in the soil ecosystem. The results also show that increases in aboveground biomass and nutrient content with the use of cover crops may not promote the abundance of soil organisms.

• Mycobiology
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• 제45권1호
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• pp.20-24
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• 2017

We investigated the effects on various crops of inoculation with species of arbuscular mycorrhizal fungi (AMF) in soils from different sources and selected AMF species suitable for domestic environment-friendly farming. Effects on plants varied with the AMF species used. In carrot, Scutellospora heterogama, Acaulospora longula, and Funneliformis mosseae had a positive effect on growth of the host, whereas AMF had only weak effects on the growth of red pepper and leek. AMF inoculation had positive effects on the growth of carrot and sorghum. The results of this study indicate the nature of the relationship between soil, plants, and AMF; this study therefore has important implications for the future use of AMF in environment-friendly agriculture.

• 한국산림과학회지
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• 제98권5호
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• pp.524-530
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• 2009

We scrutinized the Korean taxonomic literature, with special focus on some nomenclatural points and four different cases were listed categorically. Several naked names (nomen nudum), invalidly published names, typographical and orthographical errors, incorrect use of hybrid names and authorship, and errors in the citation of the bibliographic references have appeared in newly published literature in Korea, due to misapplications of ICBN (International Code of Botanical Nomenclature). Although literature review and synonyms are imperative and essential elements of taxonomic study, many author citations tend to be copied from one publication to another without any confirmation of the original source. It is strongly recommended that scientists who have previously published careless work should be more careful, and they should be instructed to read original descriptions and to learn current practices in the code.

• 전력전자학회논문지
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• 제24권5호
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• pp.342-348
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• 2019

The emergency power supplies (EPSs) are required to increase battery sizing for protecting power source loss above designed criteria. This study proposes a sizing method for lithium-based batteries for EPSs in nuclear power plants on the basis of the calculation method for the required energy under variable conditions. The variable conditions are related with the characteristics of lithium-based batteries, such as the temperature of the location of EPS installation, aging, and design margin. The usage of lithium-based battery reduces the cost and installation space and enables the safe and long-term supply of power compared with the use of lead-acid battery.

• 한국산업융합학회 논문집
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• 제23권2_2호
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• pp.199-207
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• 2020

These days, many different types of valves are developed in the industrial area according to their use purpose. Multiple kinds of valves are installed to control a flow and pressure of the pipe conveying fluid. Valves serve as critical roles in land plants such as power plants. The performance of equipment varies depending on valve characteristics. In this study, the internal flow analysis on Cone-type valve is conducted to analyze flow field and secure a value of the flow coefficient Cv. According to the internal flow analysis, when the flow distribution of the middle cross-section of valve was open 100%, flow field was relatively and smoothly taken out. If it was open 50%, flow recirculation region increased and a little complex flow field occurred. Unlike ball valve or butterfly valve, this valve had flow recirculation in its outlet depending on a valve opening amount. Therefore, it was found that there was no flow recirculation in the outlet of Cone-type valve.