• 한국농공학회논문집
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• 제48권6호
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• pp.3-13
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• 2006

Although the drought impacts are comparably not catastrophic, the results from the drought are fatal in various social and economical aspects. Different from other natural hazards including floods, drought advances slowly and spreads widely, so that the preparedness is quite important and effective to mitigate the impacts from drought. Soil moisture depletion directly resulted from rainfall shortage is highly related with drought, especially for crops and vegetations, therefore a drought can be evaluated using soil moisture conditions. In this study, SMI (Soil Moisture Index) was developed to measure a drought condition using soil moisture model and frequency analysis for return periods. Runs theory was applied to quantify the soil moisture depletions for the drought condition in terms of severity, magnitude and duration. In 1994, 1995, 2000, and 2001, Korea had experienced several severe droughts, so the SMI developed was applied to evaluate applicability in the mid-range hydrologic unit watershed scale. From the results, SMI demonstrated the drought conditions with a quite sensitive manner and can be used as an indicator to measure a drought condition.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 총회 및 춘계학술발표회
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• pp.363-370
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• 2005

There are approximately 2,000 metallic mines which have been abandoned in Korea. Most of the mines are located in the watershed area, which is main source of drinking water for Seoul Metropolitan area. Untreated mining wastes are remained around abandoned mines in study area. These mining wastes, flowing into farmland and stream in the downstream of abandoned mines, would cause water and soil pollution. The mining waste samples from Guedo mine, Manjung mine and Joil mine recently abandoned were collected for the evaluation of the potential of water pollution by mine waste. Index of geoaccumulation($M\"{u}ller$, 1979), fractional composition and removal efficiency of some heavy metals by different concentration of HCl treatment were analyzed. Index of geoaccumulation of Cd, Pb, Zn, Cu, Ni and Cr are 6, $4{\sim}6,\;0{\sim}6,\;4{\sim}5$, 2 and 0 respectively. Index of geoaccumulation of Cd, Pb, Zn and Cu reveals the mining wastes has high pollution pottential in the area. Organic fraction of Cu, reducible fraction of Pb, residual fraction of Ni and Zn were the most abundant fraction of heavy metals in mining wastes.

• 동의생리병리학회지
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• 제22권6호
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• pp.1611-1620
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• 2008

This clinical research was conducted to test patients with Atopic Dermatitis by external application with Hwangryeonhaedok-Tang in cosmetics. We gave scores to 31 patients who visited the Dept. of Oriental Medical Opthalmology & Otolaryngology & Dermatology of Semyung University Jecheon Oriental Medical Hospital from May 15th, 2008 to June 26th. Fifteen patients were treated with the ointment that contain Hwangryeonhaedok-Tang (experimental group) and sixteen patients were treated with normal ointment that doesn't have Hwangryeonhaedok-Tang (control group) for 4 weeks. We observed change of total IgE, eosinophil count, Skin Temperature, Transepidermal Water Loss(TEWL), Skin Hydration and Skin pH. Also Clinical Index of Atopic Dermatitis(SCORAD Index) and global assesment of efficacy were used to evaluate the effects of Hwangryeonhaedok-Tang. Statistical analysis was performed by using frequency analysis and descriptive analysis. Statistical significance was achieved if the probability was less than 5%(p<0.05). After 4 weeks of external application treatment, SCORAD Index in experimental group was significant statistically decreased compared with control group. After 4 weeks of external application treatment, total IgE of both groups were decreased and eosinophil count in control group was decreased but experimental group was unstatistically decreased. Unstatistically, both groups didn't showed significant effect on Skin Temperature. Transepidermal Water Loss(TEWL) in both groups were increased but experimental group was significant decreased compared with control group. Skin Hydration in experimental group was significant statistically increased compared with control group. Statistically, both groups didn't showed significant effect on Skin pH. Only experimental group showed little increase. After 4 weeks of external application treatment, experimental group showed significant effect on global assesment of efficacy. Considering the above results, we can speculate that cosmetics with Hwangryeonhaedok-Tang has some therapeutical effects in mitigating the symptoms of Atopic Dermatitis.

• 보건교육건강증진학회지
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• 제13권2호
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• pp.24-34
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• 1996

This study had been carried out to analyze the relationship among the personal variables, the variales of life style and physical and mental health status of workers. In order to analyze the influence of industrial worker's life-style on physical and mental health status of workers, explore the relaionship between healh status and their life-style. Special interest in this study was the assesment of worker's physical and mental health status measured by the Todai Health Index(THI)-a self-adminstered health stutus screening instrument developed by a University of and Gumma research team. Data were collected from an industry of 1,495 workers at city of Chang Won in Korea. 1. The young age group especially the group who had short work duraion less than two years had high THI scores which were statistically significant. 2. A worker who followed 6∼7 good life style scores were found to be associated with better health status than those who followed 0-3 bad life style scores in most of all dimensions of physical and mental health scales of THI. 3. According to the multiple regression analysis, the variable of life style scores had the greatest influence on physical and mental health status of industrial workers. The variable of age, duration of work, and life style were included in the regression model(R²= 18.8).

• 한국공간구조학회논문집
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• 제18권2호
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• pp.87-97
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• 2018

Stone pagoda structures have continued to be aged due to the combination of various damage factors. However, some studies on nonstructural damage have been carried out, but assessment studies on structural damage have not been done in various ways. Therefore, in this study, structural and nonstructural influencing factors according to the damage types are classified and the damage assessment according to the structural influencing factors affecting the behavior of the stone pagoda structure is performed. In addition, the damage rating classification criteria for each type of structural damages or damage locations are presented, and the damage index is calculated by providing the criteria for the classification of damage according to the degree of damage to which the damage is caused. Therefore, this study can evaluate quantitatively the damage status of stone pagoda structures.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.317-317
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• 2014

The structure performance of a sealed power facilities and the explosion simulation contains significant amounts of scatter, and variability has been characterized in material properties of the structure, a sealed space density, combustible gas volume, gas concentrativeness, ignition site, and gas volume. In order to deal with such uncertainties, structural reliability analysis calculates the failure probability and the reliability index relevant to selected limit states providing quantitative measures of these uncertainties. In this study, structure safety assessment method on the explosion of a sealed power facilities was proposed by using the response surface method (RSM).

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 춘계학술대회
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• pp.161-167
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• 2004

IEC 60300 series, the international standards on reliability management system are newly developed and introduced rapidly worldwide. In order to meet this fast-changing situation, it is necessary to apply them to the Korean industries effectively. It includes the establishment of the infrastructure such as documentation of Korean Standards, introduction of test equipments and test manuals, accreditation of the certification body and training of the specialists etc. IEC 60300 is upgraded management system of the ISO 9000 and ISO 14000. In this regard, the Korean companies which was certified with the ISO 9000 or 14000 should endeavor to find new strategies and methods to be certified with ISO 60300. This paper introduces a quantitative method of estimating the level of the reliability management system by applying the MIR(Maturity Index on Reliability) technique. This enables the estimation of the operation level of the system and can upgrade the maturity level of it.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전력기술부문
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• pp.227-229
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• 2004

In a new competitive market environment, it is very important to determines how much power can be transferred through the network. It's known as Available Transfer Capability(ATC). This paper presents a technique to evaluate Reliability Assesment and the Available Transfer Capability of Haenam-Cheju HVDC transmission system using Well-being Method which is based on the probabilistic method. The system Well-being is categorized in terms of the system Healthy and Marginal in addition to the conventional Risk index. Haenam-Cheju HVDC system has been studied for the optimal ATC based in well-being categories.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 추계학술대회 논문집
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• pp.542-549
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• 1999

The purpose of this study is to investigate stability of a high speed train and to propose optimal design using sensitivity analysis of suspension design parameters. A form of equations of motion in tangent track and curve track is obtained based on each creep force. Tangent track and curve track equations include lateral, rolling and yawing motions of wheel sets, bogies, and carbodies. Three track cases have been chosen to stability assesment of a high speed train analysis. Sensitivity equations are set up by directly differentiating the equations of motion. This study def'.led Stability performance index of a high speed train in tangent track and curve track. The relative magnitude of the effect of suspension parameters on the critical speed is computed, and by adjusting these parameters, the increase of the critical speed is achieved.

• 해양환경안전학회지
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• 제18권1호
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• pp.15-24
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• 2012

동해연안의 수질특성 및 상태를 파악하기 위하여 2004년부터 2010년까지의 국가해양환경측정망 조사결과를 이용하여 수질인자의 거동을 분석하였다. 본 연구에서는 통계적 방법을 이용한 수질인자간의 상관관계 및 주성분 분석을 통하여 해역별 수질환경 특성을 파악하였으며, OECD의 부영양화 기준과 부영양도, 그리고 유기오염도 지수의 산정으로 해역별 오염상태를 평가하였다. 수질인자간의 주성분 분석에서 동해연안은 클로로필 a와 염분이 주요인자로 설명되는 2개의 요인으로 구분되었다. 해역별로는 죽변을 경계로 남부와 중부로 분류되었으며, 동해 중부 해역에서는 죽변, 그리고 남부해역에서는 감포연안이 별도로 분류되었다. 동해연안의 영양상태는 Oligotrophic~Mesotrophic 수준으로 구분되었으며, 부영양화도는 1 이하로 평가되었다. 유기오염지수는 동해연안 전 해역에서 양호한 수질상태로서 평가되었다.