• 지질공학
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• 제2권1호
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• pp.58-69
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• 1992

피압대수층에 있어서 피압층을 관통하는 시추공에는 대기압의 변화에 따라 수위변화가 이루어지며, 그들의 관계는 대기압이 상승하면 수위는 하강하고, 대기압이 하강하면 수위는 상승하는 반비례의 관계를 갖는다. 이러한 대기압이 압력변화를 수위로 환산한 후 수위변화량과 기압변화량과의 비율을 대기압효율이라 한다. 본역 경상계 퇴적층에 있어 주 대수층은 파쇄대, 절리면, 층리면과 지역적으로 분포하는 marl층내에 분포하는 용해공극 등에 의해 이루어진다. 본역내 대기압 효율의 분포는 8-90%로서 지역적 특성에 따라 Confinde, Unconfinde, Semi-Confined Aqifer 가 분포함을 알 수 있다. 대기압효율은 저류계수와 반비례함으로 양수시험 이전의 대수층 특성파악을 위한 경제적인 방법이기도 하다.

• 한국대기환경학회지
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• 제30권6호
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• pp.600-618
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• 2014

The metadata for urban meteorological observation is standardized through comparison with those established at the World Meteorological Organization and the Korea Meteorological Administration to understand the surrounding environment around the sites exactly and maintain the networks and sites efficiently. It categorizes into metadata for an observational network and observational sites. The latter is again divided into the metadata for station general information, local scale information, micro scale information, and visual information in order to explain urban environment in detail. The metadata also contains the static information such as urban structure, surface cover, metabolism, communication, building density, roof type, moisture/heat sources, and traffic as well as the update information on the environment change, maintenance, replacement, and/or calibration of sensors. The standardized metadata for urban meteorological observation is applied to the Weather Information Service Engine (WISE) integrated meteorological sensor network and sites installed at Incheon area. It will be very useful for site manager as well as researchers in fields of urban meteorology, radiation, surface energy balance, anthropogenic heat, turbulence, heat storage, and boundary layer processes.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2006년도 춘계학술대회 논문집
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• pp.579-580
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• 2006

• 한국식품저장유통학회지
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• 제23권7호
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• pp.960-966
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• 2016

건고추에 존재하는 미생물은 세균 3종(S. aureus, B. amyloliquefaciens, L. crispatus), 곰팡이 2종(I. lacteus, T. crustaceus)이 동정되었고, 그 중 인체 유해성이 있는 S. aureus를 대상으로 대기압 유전체장벽방전 플라즈마를 이용한 미생물 사멸효과와 건고추의 품질변화에 미치는 영향을 조사하였다. S. aureus의 사멸율은 플라즈마 처리를 위한 전력과 노출시간의 증가에 따라 증가하였고, 노출거리 증가에 따라 사멸율이 감소하였다. 한편, 다양한 전력, 노출시간, 노출거리 범위에서 건고추에 플라즈마를 처리한 결과, 건고추의 ASTA value 및 경도는 영향을 받지 않았고, 관능 특성(향, 맛, 색, 전체적 기호도)에서도 유의적 차이가 관찰되지 않았다. 최종적으로, $25^{\circ}C$에서 12주 동안 플라즈마 처리된 건고추의 저장성을 평가한 결과, 건고추의 ASTA value, capsaicin 농도, 경도가 일정하게 유지됨으로 인해 대기압 유전체장벽방전 플라즈마기술이 농 식품산업에 적용될 수 있는 유용한 살균기술임을 확인하였다.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.227.1-227.1
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• 2003

Acetyl-L-carnitine (ALC), an endogenous component of L-Carnitine, is the acetyl ester of carnitine that has been reported to be beneficial in depressive disorders and Alzheimer's disease.ALC is so hygroscopic that deliquescence took place when it absorbed moisture by 15%(w/w) in a week and then reached steady-state at 45%(w/w) in 40$^{\circ}C$, 75% RH storage condition. Therefore it is necessary to prevent ALC from absorbing atmospheric moisture. For this purpose, we chose hydroxypropylmethylcellulose phthalate (HPMCP) an enteric polymer, as a film former. (omitted)

• Journal of Biosystems Engineering
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• 제41권4호
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• pp.373-388
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• 2016

Background: Recent inquiries into high-quality foods have discussed the importance of the functional aspects of foods, in addition to traditional quality indicators such as color, firmness, weight, trimming loss, respiration rate, texture, and soluble solid content. Recently, functional Chinese cabbage, which makes up a large portion of the vegetables consumed in Korea, has been identified as an anticancer treatment. However, the investigation of practical issues, such as the effects of storage conditions on quality indicators (including functional compounds), is still limited. Purpose: We reviewed various studies on variations in the quality indicators and functional compounds of Chinese cabbage in response to different storage environments, focusing on storage temperature and storage period. In particular, we emphasized the effect of storage temperature and storage period on glucosinolate (GSL) levels, in order to provide guidelines for optimizing storage environments to maximize GSLs. Additionally, we used response surface methodology to propose experimental designs for future studies exploring the optimal storage conditions for enhancing GSL contents. Review: Large variations in quality indicators were observed depending on the cultivar, the type of storage, the storage conditions, and the harvest time. In particular, GSL content varied with storage conditions, indicating that either low temperatures or adequate air composition by controlled atmospheric storage may preserve GSL levels, as well as prolonging shelf life. Even though genetic and biochemical approaches are preferred for developing functional Chinese cabbage, it is important to establish a practical method for preserving quality for marketability; a prospective study into optimal storage conditions for preserving functional compounds (which can be applied in farms), is required. This may be achievable with the comprehensive meta-analysis of currently published data introduced in this review, or by conducting newly designed experiments investigating the relationship between storage conditions and the levels of functional compounds.

• Current Research on Agriculture and Life Sciences
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• 제3권
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• pp.85-91
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• 1985

Fuji의 감압저장중(減壓貯藏中) 품질변화(品質變化)에 미치는 영향을 효소적(酵素的)인 면(面)에서 관찰하고자 preclimacteric 단계에서 수확하여 상온(常溫)($15^{\circ}C$) 및 저온(低溫)($2^{\circ}C$), 감압(減壓)(380mmHg) 및 상압(常壓)(760mmHg)에서 저장(貯藏)하여 경도(硬度), 산(酸), 당(糖) 그리고 효소활성(酵素活性)의 변화 및 전기영동형(電氣泳動型)의 변화를 관찰하였다. Fuji 사과의 Acid-phosphatase는 cell wall fraction에 주로 존재하며 climacteric maximum에서 최고의 활성(活性)을 보였으며 이후로 감소하는 경향이었으며 상온상압구(常溫常壓區)에서 변화의 폭이 가장 크고 활성(活性)이 높았으며 그 다음 상온감압구(常溫減壓區), 저온상압구(低溫常壓區), 저온감압구(低溫減壓區)의 순(順)이었다. 효소(酵素)의 최적(最適) pH는 5.5, 최적온도(最適溫度)는 $45^{\circ}C$였다. 열(熱)과 pH의 안정성(安定性)을 조사한 결과 $30^{\circ}C$까지는 안정하였으며 pH 5~8사이에 안정하였다. 무기감(無機監) 영향에서는 Fe, Hg에 의해서 크게 저해(沮害)되었다. 저장중 상온상압구(常溫常壓區)와 저온감압구(低溫減壓區)에서 저장기간별로 추출해낸 효소액(酵素液)을 전기영동(電氣泳動)시킨 결과 전기간(全期間)에 걸쳐서 약간의 변화를 나타내었다.

• 한국환경과학회지
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• 제22권2호
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• pp.139-149
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• 2013

Anthropogenic increases in greenhouse gas concentrations, primarily through radiative forcing from carbon dioxide, continue to challenge earth's climate. This study quantified $CO_2$ storage and uptake by dominant forest types and age classes in the middle region of Korea. In addition, the role of forest landscapes in reducing atmospheric $CO_2$ against $CO_2$ emissions based on energy consumption was evaluated. Mean $CO_2$ storage and uptake per unit area by woody plants for three forest types and four age classes were estimated applying regression equations derived to quantify $CO_2$ storage and uptake per tree; and computations per soil unit area were also performed. Total $CO_2$ storage and uptake by forest landscapes were estimated by extrapolating $CO_2$ storage and uptake per unit area. Results indicated mean $CO_2$ storage per unit area by woody plants and soils was higher in older age classes for the same forest types, and higher in broadleaved than coniferous forests for the same age classes, with the exception of age class II (11-20 years). $CO_2$ storage by broadleaved forests of age class V (41-50 years) averaged 662.0 t/ha (US$331.0 hundred/ha), highest for all forest types and age classes evaluated. Overall, an increased mean $CO_2$ uptake per unit area by woody plants was evident for older age classes for the same forest types. However, decreased $CO_2$ uptake by broadleaved forests at age class V was observed, compared to classes III and IV with an average of 27.9 t/ha/yr (US$14.0 hundred/ha/yr). Total $CO_2$ storage by woody plants and soils in the study area was equivalent to 3.4 times the annual $CO_2$ emissions, and woody plants annually offset the $CO_2$ emissions by 17.7%. The important roles of plants and soils were associated with 39.1% of total forest area in South Korea, and $CO_2$ emissions comprised 62.2% of the total population. Therefore, development of forest lands may change $CO_2$ sinks into sources. Forest landscape management strategies were explored to maintain or improve forest roles in reducing atmospheric $CO_2$ levels.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.65-72
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• 2001

Since Pyoungtaek thermal power plant began using natural gas in 1986, the annual using volume has rapidly increased and reached 12.7 million tons in 1999. When the natural gas is cooled to a temperature of approximately -162$^{\circ}$C at atmospheric pressure, it condenses to a liquid called liquefied natural gas(LNG). LNG has a special characters such as odorless, colorless, non-corrosive, and non-toxic. So, LNG storage tank, tanker ship, transfer pipelines are required the special storage and transportation systems and technology. The presently operating LNG terminals are Pyongtaek and Inchon terminals. A total of 19 above-ground LNG storage tanks(100 thousand ㎘ grade) are currently in operation with a sendout capacity of 4,360tons/hour. To meet the growing domestic demand of LNG supply, the Inchon receiving terminal is expanding(six in-ground tank) and constructing a third LNG terminal at Tongyong. In this paper, case study on seepage analysis and countermeasure against increasing the seepage volume of in-ground LNG storage tank excavation work is reported. The results of an additional seepage analysis are presented to verify the design seepage volume of assumption section and seepage volume after curtain-grouting in the slurry wall.

• Applied Biological Chemistry
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• 제27권2호
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• pp.86-94
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• 1984

사과의 저장조건에 따른 품질보존 및 저장효과를 높이기 위한 목적으로 우리나라에서 주로 생산되고 있는 후지, 국광 및 홍옥과실을 preclimacteric 단계에서 수확하여 상온$(20^{\circ}C)$ 및 저온$(1^{\circ}C)$에서 각각 상압(760mmHg)과 감암(380mmHg)으로 처리하여 저장중 향기성분의 변화를 조사하였다. 저장중 향기성분의 함량변화는 상온에서 저장 30일경까지는 급격히 증가하다가 그 이후에는 급격히 감소하는 경향이었으며 감압이 상압보다 증감의 경향이 완만하였고, 저온에서는 저장 $30{\sim}60$일경까지 전반적으로 완만하게 증가하다가 그 이후에는 감소하는 경향이었으며 감압이 상압보다 함량의 변화폭이 적었다. 저장중 향기성분의 종류가 증가하는 경향이었으며, 향기성분중 ester는 alcohol과 aldehyde에 비하여 급격히 감소하였다. 후지를 저온감압하에서 90일간 저장한 후 상압에서 $20^{\circ}C$로 보존하였을 때 3일경에 이러러 향기성분의 함량이 거의 최대치에 도달하였다.