• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.379-382
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• 2000

The characteristics of Xe discharge lamp(Mercuryless lamp) are described in this paper. In this paper, FFL is operated by sine wave and pulsed source. We apply V-Q Lissajous' figure for the discharge measurements of FFL which has the electrodes covered with dielectric. When FFL is operated by sine wave source, the characteristics are similar to DBD(Dielectric Barrier Discharge) and SD(Silent Discharge). And we compared the characteristics of FFL which is operated with sine wave and pulsed discharge by using V-Q Lissajous' figure method. When FFL is operated with pulsed, the discharge current flows after the applied voltage is risen. As the duty ratio increases the electric field becomes strong and much more xenon ions are produced. And the number of metastable xenon atoms seem to increase, therefore, the phosphor radiation after the cut off of voltage increases compared with the first peak of radiation. Consequently, the 172㎚ radiation becomes strong as the duty ratio increases.

• 한국지반신소재학회논문집
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• 제7권2호
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• pp.15-21
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• 2008

인공연직배수재는 일반적인 샌드드래인에 비하여 비용 절감, 지반 교란의 최소화, 시공성 및, 시공 중에 발생될 수 있는 배수재의 변형을 최소화하는 유연성을 지니고 있다. 본 연구에서는 실내실험을 통하여 측압과 동수경사에 따른 여러형태 PVD의 통수능을 도출하였다. 시험결과는 압밀된 점토에 대한 과압력이 증가하였으며, 또한 PVD 공시체의 측압도 증가하였다. 이는 측압이 증가함에 따라 통수능이 감소됨을 나타내고 있으며, PVD 코어의 공극크기는 통수능과 비례관계에 있음을 보여준다. 현장조건을 고려하여 시뮬레이션을 통한 침하량에 대한 수치해석을 수행한 결과 현장계측한 침하량과 유사하게 나타났다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 C
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• pp.1828-1830
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• 2003

Partial discharge(PD) tests are used to evaluate the insulation condition of stator windings in two 4.16kV and three 6.6kV motors. These tests were conducted using a conventional partial discharge detector(PDD) and turbine generator analyzer(TGA). Off-line PD measurements were performed on five high voltage motors. PD magnitudes ranged from 1000 pC to 5400 pC at the normal line-to-ground voltage. Five high voltage motors have been equipped with 80pF epoxy-mica coupler on the motor terminal box. The PD pulse from sensors were measured with the TGA instrument. TGA summarizes each plot with two Quantities such as the peak PD magnitude(Qm) and the total PD activity(NQN). The defect mechanisms of high voltage motor can be associated with PD patterns such as internal, slot and conductor surface discharges. The PDD and TGA test results of No. 4 motor showed that internal discharge was detected in voids of the groundwall insulation.

• 한국수자원학회논문집
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• 제30권6호
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• pp.671-678
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• 1997

전자파를 이용한 하천수 표면 유속계를 하천 유량 측정에 사용하여 실용성과 문제점을 분석하였다. 표면 유속계의 평가는 선박 실험용 선형수조를 이용하여 수행하였다. 그 결고, 수직각을 20$^{\circ}$, 35$^{\circ}$, 45$^{\circ}$로 하였을 때 유속측정 평균값의 오차는 5.5% 이하였다. '95년 8월 26일 8~10시 사이에는, 남한강 여주대교 지점에서 홍수 유속을 측정하였다. 500m 길이의 교량에 대하여 23개 지점에서 측정한 결과, 표면 유속값은 약 2~4m/s였다. 수심평균 유속 환산계수를 0.85로 하고, 유량을 환산한 결과는 약 10,500 ㎥/s였다. 환산유량값은 수위-유량식이나 부정류 계산에 의한 값과 $\pm$2% 이내의 편차를 보였다. 자료 사용 간격을 40m 또는 60m로 변경하여 유량을 환산하여도 별다른 차이가 없었다. 평상시의 유량측정은 '96년 하반기에 대청교 지점에서 수행하였다. 대청댐의 방류량을 기지값으로 하여 수심평균 유속 환산계수를 추정한 결과 0.83~0.87의 범위에 있었다. 계기 자체의 미세오차와 바람의 영향은 계속 연구되어야 하지만, 하천의 홍수 유량측정에 표면유속계를 사용하는 것은 간편하고 실용적인 대안이 될 수 있음을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1606-1607
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• 2011

In this study, the propagation characteristics of partial discharge(PD) pulses in the 3-phase cable systems including crossbonding joints were discussed. For the purpose, experiments for 22.9kV CNCV cables were performed using simulated PD pulses, and on-site partial discharge measurements were carried out for the 345kV XLPE cable system.

• 중환자간호학회지
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• 제7권1호
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• pp.24-32
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• 2014

Purpose: The purpose of this study was to examine the effects of discharge planning on patient satisfaction, the readmission rate and preparedness for discharge in the elderly admitted to the emergency room (ER) for pulmonary disease. Methods: A quasi-experimental intervention study design was used. Older adults with pulmonary health problems in the ER in one general hospital were randomly allocated to either an experimental (n=21, 74.2 years) or control group (n=19, 70.7 years). The experimental group participated in a discharge planning program by a geriatric nurse practitioner. Data were collected from medical records, physical measurements and structured questionnaires including information on demographics, patient satisfaction, readmission, and preparedness for discharge. Results: Participants in the experimental group had significantly better outcomes with regard to patient satisfaction with nursing services (p=.003) and preparedness for discharge (p=.034). However, there was no significant effect on the readmission rate (p=.392) Conclusion: The results suggested that a discharge planning program could bolster nursing service satisfaction and preparedness for discharge in older patients admitted to the ER for pulmonary health problems. To clarify the effects of discharge planning on older patients admitted to the ER, a larger sample population, better instruments for various measures, a new manual on discharge planning and frequent follow-up will be necessary.

• 한국환경과학회지
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• 제4권2호
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• pp.169-180
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• 1995

This Daper presents effective simulation of the dispersion of thermal discharge which can be relesed at Boryong power plant. Applied numerical models are finite difference method for hydrodynamic analysis and Masch-model comprised of conditions for ambient current velocity. Application of these models is done in Cheonsu Bay Summing up the results of this study are as follows; 1. It is found that the result for measurements of temperature appears high at southwardly Songdo on flood. The reason is that tidal currents which flowed north direction were accompanied with southwardly dispersed thermal discharge. A minute Particle of thermal Plume has a tendency to dispels inward Deacheon Bay. 2. According to the results of numerical experiment, maximum distance for thermal discharge dispersion appeared 10.8 km at lower part and 8.6 km at upper part with power plant outlet as starting point. 3. Comparative the numerical simulation and Airbone Multispectral Scanner indicated that thermal discharge should be verified separative phenomena. The simulated results were compared with field data set showing good agreement. It is concluded that these model can be simulated well.

• International Journal of Precision Engineering and Manufacturing
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• 제8권4호
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• pp.45-49
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• 2007

When drilling using electrical-discharge machining (EDM), severe electrode wear makes in-process measurements of the depth of the drilled hole and the volume of material removed impossible. To estimate the volume of material removed a reliable real-time discharge pulse counting method is proposed by assuming that the volume removed in EDM is proportional to the number of discharge pulses from an iso-energy pulse generator. The geometry of machined holes, including depths and cross-sectional profiles, is estimated using geometric analysis. A proportional relationship between the volume of material removed and the number of discharge pulses was developed and verified by experiments.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.832-839
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• 2010

The pulse discharge anchor is a method to increase the capacity of anchors using electric discharge geotechnical technologies, which is also known as pulse discharge and electric-spark technologies. The pulse discharge anchor has bulbed bond length that is expanded by high voltage electrokinetic pulse energy. 24 anchors were installed in the weathered soil and sandy clay at the Geotechnical Experimentation Site at Sungkyunkwan University in Suwon, Korea and attached strain gauge at 10 anchors. The numerical predictions by Beam-Column analysis were compared with observed measurements in a field load test.

• 대한설비공학회지:설비저널
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• 제17권2호
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• pp.150-158
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• 1988

On a refrigeration compressor, damage of a discharge valve is one of the annoying troubles for an engineer. Small size compressors, having ring plate type discharge valve are recently used. Therefore, it is very important for engineers to measure and analyze strains of discharge valve. The purpose of this study is to obtain the basic data of the strain of the flexible ring valve. Measurements were performed by the strain gauge bonded on the surface of the flexible ring valve. Stress and strain of the valve were calculated by the method of uniformly loaded circular plates with a central hole. The results obtained are as follows; (1) the strain of flexible ring discharge valve in refrigeration compressor was influenced by tension and compression strain simultaneously. (2) for a given discharge pressure, the tangential and radial strains was increased with increasing discharge pressure. (3) the valve of radial strain was larger than that of tangential strain.