• Natural Product Sciences
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• 제19권3호
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• pp.236-241
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• 2013

A high-performance liquid chromatography-diode array detector (HPLC-DAD) method was established for quantitative evaluation of nine constituents of Fraxinus rhynchophylla such as four coumarins, esculin (1), fraxin (2), esculetin (3), fraxetin (4), three lignans, syringaresinol 4,4'-O-${\beta}$-diglucoside (5), pinoresinol 4-O-${\beta}$-glucoside (6), pinoresinol (9), one secoiridoid, oleuropein (7), and one coumarinolignan, cleomiscosin C (8). The preferred chromatographic condition was obtained on Phenomenex Gemini-NX (3 ${\mu}m$, C18 110A, $150{\times}4.60$ mm) and the mobile phase was composed of water and acetonitrile using a gradient elution. The wavelength was set at 220 nm. Extraction condition of these constituents in F. rhynchophylla was also optimized through extraction time, extraction solvent and extraction method using established method. From this study, extraction at $70^{\circ}C$ with the mixture of ethanol and water for more than 12 h was suggested to be good extraction condition for these constituents. Quantitation of nine constituents in different F. rhynchophylla samples was also successfully accomplished with the newly established method.

• 한국터널지하공간학회 논문집
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• 제3권3호
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• pp.45-56
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• 2001

터널 시공에 영향을 주는 지질구조에 대한 정확한 정보를 얻기 위해서는 시공 중의 탐사기법이 중요한 역할을 한다. 국내에서 막장 전방 지질조건을 예측하기 위한 터널내 탄성파 반사법 탐사로는 TSP(Tunnel Seismic Prediction)법을 주로 적용했으나, 본고에서는 HSP(Horizontal Seismic Profiling)법을 수행하였다. 현장 적용결과 소규모의 불연속면의 존재가 예측되었으며, 또한 지반 조사에서 추정된 RMR 값과 터널내 반사법 탐사를 통하여 얻은 암반조건과 거의 일치하는 결과를 얻었으며, 시공 중 평가되는 암반 분류 및 평가 결과와 비교 검증하였다.

• 한국도로학회논문집
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• 제2권3호
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• pp.145-153
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• 2000

포장의 합리적 유지관리를 위해서는 기본적으로 포장의 상태를 객관적으로 평가하고, 평가한 자료를 이용하여 경제성 분석을 실시함으로써 최적의 보수공법 및 보수우선순위를 결정해야 한다. 전체적인 포장 상태를 객관적으로 평가하기 위해서는 포장상태 평가지수와 같은 단일화된 평가 기준이 필요하다. 본 연구에서는 우리나라 고속도로 콘크리트 포장에 적합한 포장상태 평가지수를 개발하기 위하여 현장 상세조사 및 포장평가위원회의 평가를 실시하고, 그 결과의 회귀분석을 통해 포장평가지수를 개발하였다. 또한 개발된 포장평가지수를 이용하여 포장유지관리에서 이용되기 위한 보수공법그룹을 제시하였다. 개발된 포장평가지수의 상관계수는 0.68이었으며, 콘크리트 포장평가지수에 사용된 독립변수들은 종단평탄성, 균열, 패칭 등이었다.

• 대한예방한의학회지
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• 제19권2호
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• pp.51-56
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• 2015

Objective : We analyzed present condition of cooperative medical care using claims data of HEALTH INSURANCE REVIEW & ASSESSMENT SERVICE form patients treated by Korean-Western cooperative medicine. The study aimed to offer guidelines in selecting disease-related research in developing Korean-Western convergence technology. Method : Based on the patients using Korean medical service, we analyzed claims data of patients using Korean medical service and western medical service from January 2012 to December 2013. We were assigned to the server remotely. With the concept of 'episode of care', we rebuilt claims data and analyzed present condition of cooperative medical usage. Results : We analyzed present condition of cooperative medical care per episode of care. Among outpatients, Low back pain, lumbar region(M5456) was the highest number. Among inpatients, Sciatica due to intervertebral disc disorder(M511) was the highest number. Conclusion : Based on the claims data provided by HEALTH INSURANCE REVIEW & ASSESSMENT SERVICE, we have derived a list of multy frequently disease frequently treated by cooperative medical care by analyzing present condition.

• 전력전자학회논문지
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• 제23권6호
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• pp.373-380
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• 2018

This study proposes a new islanding detection method that uses the phase shift of feed-forward voltage and evaluates the performance of an existing method and the proposed method when the grid frequency changes within the allowable range under steady-state conditions. The investigated existing method, which is slip mode frequency shift (SMS), uses current phase shift to detect islanding. The SMS method supplies reactive current to the grid under this condition, but the proposed method does not generate additional reactive power because it does not depend on the current control loop. The performance in steady-state grid condition is evaluated through simulations and experiments.

• 한국도로학회논문집
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• 제15권3호
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• pp.127-135
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• 2013

PURPOSES : The purpose of this study is development of automatic equipment to measure the road water-reservoir which can be one of factors for road traffic safety inspection and its application to safety analysis. METHODS : The scopes of this study are the examination of the riskiness and location of road water-reservoir through literature review, development of appropriate sensor and automatic equipment to survey the road water-reservoir and evaluation of field application. RESULTS: The laser lighting and IR camera were selected to develop the equipment. It was found from the field calibration that there is a high correlation between rutting and road water-reservoir and road water-reservoir caused by rutting can be correctly calculated. About 20.2km of national highway were inspected for case study and field application. It was found from correlation of traffic incident that 2.08km of the latent length for water-reservoir which is related to 12 traffic incidents were analyzed. CONCLUSIONS : This technique can be utilized evaluation method for road condition such as road water-reservoir for conventional evaluation system such as road traffic safety assessment and safety analysis and it can be use to new evaluation system to apply various road condition and traffic condition.

• 한국측량학회지
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• 제35권3호
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• pp.175-186
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• 2017

본 연구에서는 UAV를 이용한 국공유지 실태조사 필지의 효율성과 정확성을 평가하기 위해 지적현황측량 검사점의 정확성과 경제적 비용측면에서 제시하였다. 분석결과를 요약하면 다음과 같다. 첫째, 정사영상의 위치오차는 평균적으로 X오차 0.033m, Y오차 0.023m로 나타나 평면거리 연결교차로 계산하면 RMSE 평균은 0.046m로 나타났다. 둘째, 정사영상과 VRS-GNSS 성과비교에서는 UAV 정사영상 이미지 검사점의 최대 RMSE는 0.076m이고 최소 RMSE는 0.042m로 나타났다. 세째, 모든 검사점이 현행 지적측량규정에 명시된 1/1,200의 축척에 해당하는 0.360m 이내의 오차범위를 만족하였다. 끝으로 국공유지 실태조사를 위한 경제성 평가에서는, UAV 활용방법이 지적현황측량 방법보다 26,497,436원이 더 적게 들어가는 것으로 나타났다. 따라서, 본 연구결과 국공유지 실태조사에서 UAV를 활용하는 방법은 정확도 측면에서도 법적 기준을 충족하며, 경제성 측면 역시 지자체의 예산을 더욱 줄일 수 있는 방법으로 나타났다.

• 조명전기설비학회논문지
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• 제19권2호
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• pp.94-99
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• 2005

본 논문은 수직온도분포 분석을 이용한 몰드변압기 권선의 건전성 평가 방법을 제시하고 있다. 이 방법은 건전 시료의 온도 분포와 가속열화실험에 의해 층간 단락된 고장시료의 온도 분포 비교를 통해 얻어진 결과이다. 분석에 활용된 온도분포는 적외선 열화상 시스템에 의해 취득되었고, 가속 열화시험에는 Arrhenius 방정식이 적용되었다. 제안된 방법은 몰드변압기 고장을 검출하는데 유용할 것이다.

• 한국유체기계학회 논문집
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• 제12권2호
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• pp.31-38
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• 2009

The valve performance has been evaluated from the theoretical equation based on design information such as packing thrust, spring preload and friction coefficient(${\mu}$). The accuracy of those data can be lower than that of vendor's initial design data. Especially, the friction coefficient can be degraded with time than the original condition and the valve performance calculated using the previous friction coefficient can not be available. Accordingly, this paper is describing a new performance evaluation method of valve based on diagnostic test data which are acquired from a site valve tested in static and dynamic conditions. Especially, this paper provides a new method using friction coefficient(${\mu}$) which is derived from the diagnostic test data acquired in the valve's design basis condition.

• 대한산업공학회지
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• 제40권3호
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• pp.325-332
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• 2014

High cognitive workload decreases a driver's ability of judgement and response in traffic situation and could result in a traffic accident. Electrocardiography (ECG) has been used for evaluation of drivers' cognitive workload; however, individual differences in ECG response corresponding to cognitive workload have not been fully considered. The present study developed an evaluation method of individual driver's cognitive workload based on ECG data, and evaluated its usefulness through an experiment in a driving simulator. The evaluation method developed by the present study determined the optimal ECG evaluation condition for individual participant by analysis of area under the receiver operating characteristic curve (AUC) for various conditions (total number of conditions = 144) in terms of four aspects (ECG measure, window span, update rate, and workload level). AUC analysis on the various conditions showed that the optimal ECG evaluation condition for each participant was significantly different. In addition, the optimal ECG evaluation condition could accurately detect changes in cognitive workload for 47% of the total participants (n = 15). The evaluation method proposed in the present study can be utilized in the evaluation of individual driver's cognitive workload for an intelligent vehicle.