• The Plant Pathology Journal
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• 제29권4호
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• pp.418-426
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• 2013

Pseudomonas isolates from different crop plants were screened for in vitro growth inhibition of Phytophthora capsici and production of biosurfactant. Two in vivo experiments were performed to determine the efficacy of selected Pseudomonas strains against Phytophthora blight of pepper by comparing two fungicide treatments [acibenzolar-S-methyl (ASM) and ASM + mefenoxam]. Bacterial isolates were applied by soil drenching ($1{\times}10^9$ cells/ml), ASM ($0.1{\mu}g$ a.i./ml) and ASM + mefenoxam (0.2 mg product/ml) were applied by foliar spraying, and P. capsici inoculum was incorporated into the pot soil three days after treatments. In the first experiment, four Pseudomonas strains resulted in significant reduction from 48.4 to 61.3% in Phytophthora blight severity. In the second experiment, bacterial treatments combining with olive oil (5 mL per plant) significantly enhanced biological control activity, resulting in a reduction of disease level ranging from 56.8 to 81.1%. ASM + mefenoxam was the most effective treatment while ASM alone was less effective in both bioassays. These results indicate that our Pseudomonas fluorescens strains (6L10, 6ba6 and 3ss9) that have biosurfactant-producing abilities are effective against P. capsici on pepper, and enhanced disease suppression could be achieved when they were used in combination with olive oil.

• Journal of the Korean Wood Science and Technology
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• 제35권2호
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• pp.9-15
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• 2007

A comparative study of the structure and organization of the primary and secondary walls in different types of tropical plant waste fibers was carried out using transmission electron microscopy (TEM). The thickness of each layer was also measured using Image Analyzer. TEM micrographs haveconfirmed that cell wall structure of all six types of tropical plant waste fibers (empty fruit bunch, oil palm frond, oil palm trunk, coir, banana stem and pineapple leaf) has the same ultrastructure with wood fibre. The fibers consisted of middle lamella, primary and thick secondary wall with different thickness for different types of fibers. The secondary wall was differentiated into a $S_1$ layer, a unique multi-lamellae $S_2$ layer, and $S_3$ layer.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.65-67
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• 2008

일본 홋카이도 도야코에서 2008년 7월 열린 주요 8개국(G8) 정상회의에서는 2050년까지 전 세계 온실가스 배출량을 절반으로 줄이는 장기 목표론 추진하기로 했다. 본 논문은 D 발전소의 중유 연소에 따른 비용과 LNG 연소에 따른 비용이 같아지는 ton 당 $CO_2$ 배출비용을 찾고자 한다.

• 한국환경과학회지
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• 제33권5호
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• pp.333-343
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• 2024

This study aimed to investigate whether inhaling the aroma of essential oils could alleviate physiological stress responses and mimic the effects of forest therapy in urban settings. Briefly, 31 participants underwent stress index assessments for two days and inhaled the selected plant essential oils. The effects of this treatment on physiological responses were determined through electroencephalogram (EEG) and heart rate variability (HRV) measurements taken before and after inhaling the aroma of essential oils, extracting results for low frequency (LF) and high frequency (HF) components of HRV, as well as 𝜃 and 𝛼 brainwave activities. The results indicated that lavender oil did not yield significant differences, whereas pine, chamomile, and cypress oils exhibited significant differences in effects. Overall, stress relief was associated with enhanced 𝜃 and 𝛼 brainwave activities, a decrease in the LF component and an increase in the HF component of HRV. Among the essential oils studied, pine oil was the most effective. These findings underscore the potential of plant essential oils in replicating the therapeutic benefits of forest therapy, even in urban environments. Further investigations into their utilization are warranted to better understand and harness their therapeutic potential.

• 한국정보시스템학회지:정보시스템연구
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• 제18권3호
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• pp.231-249
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• 2009

Recently, plant construction industries are enjoying a favorable business climate centering around developing countries and oil producing countries rich in oil money. This paper proposes a methodology of implementing case-based reasoning(CBR) system for managing knowledge like lessons learned and various documents accumulated in performing power plant construction projects which are receiving a lot of order from foreign countries such as the Middle East, etc. Our methodology is consisted of 10 steps : user requirement gathering, information modeling, case modeling, case base design, similarity function design, user interface design, case base building, CBR module development, user interface implementation, integration test. Also, to illustrate the effectiveness of proposed methodology, the real CBR system is implemented for the plant business division of 'H' company which has international competitiveness in the field of plant construction industry. At present, the implemented CBR system is successfully utilizing as storing, sharing, and reusing knowledge which is accumulated in performing power plant construction projects in the target enterprise.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.375-380
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• 2009

Gas & Oil plant construction projects are increasing recently all over oil-producing countries. An EPC (Engineering, Procurement and Construction) company, which participates in the plant projects, should possess pertinent engineering licenses and EPC management skills to create high added-value. Nonetheless, there exist various risks involved in the EPC life cycle process due to such characteristics of construction projects as long duration of construction time and complicated processes along with the procured goods or services subjected to various logistics. The objective of this paper is to analyze the overall EPC life cycle for proper process and to examine various information and document. Additionally, the principal data for the analysis of the EPC process are derived from personal interviews with experts and specialty contractors of the plant projects. The results of this study would be widely used as a guide for efficient and effective management of overseas gas plant projects.

• 한국응용곤충학회지
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• 제57권3호
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• pp.199-207
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• 2018

본 연구에서는, 20종의 식물정유를 이용하여 점박이응애 성충에 대한 살비활성 및 기피활성을 확인하였다. 살비활성 평가에서는 샌달우드 오일이, 기피활성 평가에서는 클라리 세이지 오일이 가장 높은 효과를 나타내었고, 평가에 사용한 20종의 식물정유간에는 살비활성과 기피활성간의 상관관계가 매우 낮게 나타났다. 높은 활성을 나타낸 정유들의 혼합시험에서는, 거의 대부분의 조합이 서로간에 저해효과를 갖는 것으로 확인되었다. 샌달우드 및 클라리 세이지 오일의 구성성분은 GC/MS 분석을 통해 확인하였으며, 샌달우드는 세스퀴터펜류가, 클라리 세이지 오일은 모노터펜류가 주종을 이루었다. 클라리세이지 오일의 구성성분 중에서는 linalyl acetate가 가장 높은 함량을 갖고 있을 뿐만 아니라, 해당정유가 기피효과를 갖는 주된 효능물질임을 확인하였다.

• 한국식품영양과학회지
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• 제20권5호
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• pp.426-432
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• 1991

Rat에 들깨유, 옥수수유, 올리브유를 28일간 매일 투여하여 rat성장율과 간대사 및 지질대사에 미치는 영향을 측정한 결과는 다음과 같다. 체중 증가율은 2주째까지는 대조군 11.72~23,07%에 비교한 실험군 모두 7.86~20.89%로 약간 둔화되나 대체로 정상으로 볼 수 있고, 3, 4주째 들깨유 투여군(A군)이 7.57~8.63%로 대조군의 17.53~13.81%에 비해 현저히 감소되고 기타 B, C군은 대조군과 거의 같은 수준이다. 혈액의 생호학적 검사결과에서 GOT, GPT값은 전 4주간 대조군의 평균 158.8와 178.8u와 비교한 B, C군은 각각 148.1~72.5u와 153.71~83.58u로 별 영향이 없으나 들깨군(A군)은 GOT, GPT가 174.87과 93,46u로 대조군 보다 약간 증가된 값이다. Alk-P는 대조군의 58.5u에 비교한 전 실험군의 평균 58.62~61.95u는 별차이가 없다. Cholesterol과 triglyceride값은 시료의 불포화도 증대에 비례하여 감소하는 경향이고 대조군의 cholesterol과 triglyceride값 60.33mg/dl~50mg/dl과 비교한 A, B, C군이 각각 54.6~36, 61.89~44, 63.71~51mg/dl을 보여 큰 폭의 차이는 없었다. 간조직 검사 결과 A, B, C군 모두 4주재 1필에서 kupffer cell의 증식내지 활동도 증가를 보이고 특히 들깨유군의 경우는 담관의 팽대, 옥수수유군은 vesicular nuclei의 관찰, 올리브유군은 mild fatty metamorphosis가 관찰되었으나 나머지는 대부분 정상이었다. 이상의 결과에서 들깨유, 옥수수유, 올리브유를 1개월간 rat kg당 1.57ml을 매일 투여하니 유지의 불포화도의 증가에 따라 혈중 중성지방과 cholesterol 농도의 근소한 감소를 보였지만 들깨유의 4주간 투여군은 간기능에 다소 부담을 주는 것으로 보이나 대부분 실험군은 별다른 증상을 보이지 않아 . 따라서 들깨유의 장기간 복용은 간기능에 다소 유해적으로 작용할 것으로 보인다.으로 보인다.

• KSBB Journal
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• 제25권1호
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• pp.103-107
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• 2010

Oil degradation agent was developed with organic sludge and modified peat moss (MPM) to recover oil contaminated soil. Waste sludge discharged from wastewater treatment plant of chemical plant in Ulsan National Industrial Park was used as organic sludge, and MPM was purchased. Organic sludge was adequate to use as growth medium for microorganism, the surface of MPM had porous structure which could enhance the cultivation condition of oil degradation microorganisms. Water contents and TPH variation with time were observed to investigate the degradation capacity of developed degradation agent. Water contents were rapidly decreased with higher contents of MPM, however, in case of TPH, high MPM content decreased the degradation capacity. Therefore, it was recommended that the content of MPM was controlled to below 10% in degradation agent as mixing organic sludge with MPM.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.190-195
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• 2002

The intermittent high vibration has been occurred one or two times a day for a 500MW large steam turbine during 5 months. This abnormal vibration was caused by the rubbing between the rotor and the carbide accumulated on the seal tooth of oil deflector. It was found that the accumulated carbide was insulation material installed on the HIP casing from the examination of the chemical composition. Also, this paper presents the mechanism of the intermittent high vibration and the proper method to eliminate this vibration problem. This result would be good practice to find the solution of similar high vibration in the steam turbines for power plant as well as industrial rotating machineries.