• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2000년도 추계학술대회 논문집
• /
• pp.351-354
• /
• 2000

AC impedance of LiM $n_2$ $O_4$ and LiM $g_{0.1}$M $n_{1.9}$ $O_4$ samples have been studied at various temperature with charge-discharge test. AC impedance of LiM $n_2$ $O_4$ measured at -2$0^{\circ}C$, room temperature and 5$0^{\circ}C$ revealed that initial impedance before charge-discharge test was gradually decreased and become small by becoming law temperature. It indicates that the Li ion diffusion and the transfer resistance of the cathode are related to the temperature of cycling. Impedance at high temperature was suddenly increased because Mn dissolution and decomposition of electrolyte had been increased during cycling, compared to impedance at low temperature. Therefore, charge-discharge capacity was suddenly decreased at high but was slowly at low. In LiM $g_{0.1}$M $n_{1.9}$ $O_4$, impedance and capacity were stability at room temperature than there at 5$0^{\circ}C$, too. Initial impedance at 5$0^{\circ}C$ before charge-discharge test was small and impedance was suddenly increased during cycling than that at room temperature.ure.ure.

• 재활치료과학
• /
• 제9권2호
• /
• pp.55-71
• /
• 2020

목적 : 본 연구는 환자의 퇴원계획에 대한 작업치료사 개입의 필요성과 퇴원 스크리닝과 계획을 위해 고려되어야할 영역을 조사함으로써 효과적인 퇴원계획 실행을 위한 퇴원평가도구의 개발의 기초 자료를 제공하고자 실시되었다. 연구방법 : 연구 참여에 동의한 의료기관에서 근무하는 작업치료사 60명을 대상으로 온라인 설문 조사를 실시하였다. 설문 내용은 일반적 특성, 퇴원계획 현황, 퇴원평가와 퇴원계획 필요성, 총 36문항으로 구성되었다. 수집된 자료는 SPSS 20.0 프로그램을 이용하여 기술통계, 독립표본 티 검증, 일원배치분산분석, 사후검증은 쉐페 검증으로 분석하였다. 결과 : 퇴원계획과 준비에 대한 작업치료사의 역할과 퇴원평가도구의 필요성에 대한 인식은 높게 나타났으나, 작업치료사의 퇴원 관련 지식 및 정보 보유에 대한 인식 정도는 낮은 것으로 조사되었다. 퇴원계획중재 시 겪게 되는 어려움은 면담과 평가를 위한 적절한 수가의 부재, 퇴원계획을 위한 팀 접근의 부족, 퇴원계획을 위한 적절한 평가도구의 부재에 대한 응답이 높게 나타났다. 퇴원 시 평가의 필요성이 높은 영역은 낙상위험과 BADL수행으로 나타났으며, 평가의 필요성이 낮은 영역은 안녕감과 발병 전 기능수준으로 나타났다. 결론 : 본 연구를 통해 퇴원계획에 대한 작업치료사 개입의 필요성을 파악할 수 있었으며, 향후 효과적인 퇴원계획 실행을 위한 퇴원평가도구 개발의 기초자료가 될 것으로 사료된다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1167-1174
• /
• 2008

Vertical drain method, which is one of the soft ground improvement methods, shorten s drain path to accelerate consolidation process and is applied in many sites. At a recent, composite discharge capacity experiment that analyze discharge amount by consolidation behavior with overburden pressure of soft ground in laboratory, simulates similarly with actuality. Geotechnical engineering problems such a s soft ground improvement are solved by numerical analysis by development of computer and numerical analysis techniques. Numerical analysis does that result is contrary by user's inexperience for choice of constitution model and application of analysis method. Therefore, this thesis experiments on composite discharge capacity test and study discharge capacity of drain and consolidation behavior of soft ground installed prefabricated vertical drain boards. Also, This thesis studied reasonable input parameters and constitution model by compare results of composite discharge capacity test and numerical analysis using PLAXIS that is 2D finial element numerical analysis program.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 추계학술대회 논문집 전기설비전문위원
• /
• pp.214-217
• /
• 2008

To detect partial discharge of 154kV joint box, we have made experiment by using the HFCT sensor. Generally the signals which are detected in partial discharge test of underground power transmission cable are accompanied with both noises of high voltage and noises of surrounding Power cable. The most noise in near to end part of joint box is corona, beside other noises flowed from surrounding area. Partial discharge test is difficulty due to these noises. First, we test reliability on both injection of calibration signal in NJB and removal of low frequency. After that, we had analyzed frequencies by measuring signals in IJB with 300[m] distance from NJB. Also we had measured S/N ratio by using the indirected injection method of calibration signal in IJB. In this experiment, two measurement methods were difference of detection acquisition, but these had the equal frequency properties.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 C
• /
• pp.1827-1829
• /
• 2002

This paper describes AC test for long delivered drum length of cable using pre-breakdown partial discharge detection(PPD) method, which can be applied to observe the causes of electrical breakdown of EHV XLPE insulation. This method is to de-energize applied voltage to cable rapidly using pre-breakdown partial discharge, and is able to prevent complete breakdown. By this effect, defects such as voids, metal particles and protrusion in cable can be observed clearly. AC resonant test set was used for PPD method. Localization of partial discharge was performed by time difference detection of the traveling wave. Accuracy of localization was 1% to the length of test cable. Through several experiments with XLPE cable, successful results of PPD method were obtained.

• 한국화재소방학회논문지
• /
• 제29권4호
• /
• pp.26-32
• /
• 2015

이산화탄소 소화설비는 질식소화가 주된 소화작용이므로 제한된 시간 내에 소화약제를 방출하여 방호구역의 산소농도를 기준치 이하로 유지시키는 능력이 확보되어야 한다. 국내에서 이산화탄소 소화설비는 국민안전처 고시에 따라 인증된 설계프로그램을 사용하여 소화설비를 설계하고 있다. 그러나 소화설비가 설치된 방호구역의 기하학적 구조는 성능인증 단계의 모의실험장치와 차이가 있기 때문에 설계프로그램 적용 범위를 벗어난 소화설비 설계가 이루어질 수 있다. 특히, 저압식 이산화탄소 소화설비는 배관 내 유동현상에 따라 소화약제 방출량이 변하므로 소화설비 설치 후에 현장 방출시험을 통하여 성능을 확인할 필요가 있다. 현재까지 국내 외 기술기준에는 방출시험에 대한 방법론이 구체적으로 명시되어 있지 않다. 본 논문에서는 국내외 기술기준을 비교 분석하고, 방출시험 사례분석을 통하여 현장 방출시험 방법론을 제시하였다.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
• /
• pp.205.1-205.1
• /
• 2011

This study concerns a low head and kaplan turbine efficiency measurement using the acoustic scintillation flow meter(ASFM). The ASFM is one of absolute discharge measurement methods because it measures velocity-area of discharge with couples of transducers. This study shows that the highest efficiency of turbine is 87.7% and the efficiency is 85.8% in the rated output(600kW). The test result is reliable because the efficiency trend from this test is similar to the result of index test conducted in 1986. In this paper, the principle, measurement methods, application and test procedures of the test are discussed.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2008년도 추계학술대회A
• /
• pp.1289-1294
• /
• 2008

Electrostatic discharge(ESD) phenomenon is a serious reliability concern. It causes approximately most of all field failures of IC. To quality the ESD immunity of IC product, there are some test methods and standards developed. ESD events have been classified into 3 models, which are HBM, MM and CDM. All the test methods are designed to evaluate the ESD immunity of IC products. This study provides an overview among ESD test methods on ICs and an efficient ESD stress method. We have estimated on all pin combination about the positive and negative ESD stress. We make out the weakest stress mode. This mode called a worst-case mode. We proposed that positive supply voltage pin and I/O pin combination is efficient because it is a worst-case mode.

• 한국전기전자재료학회논문지
• /
• 제19권6호
• /
• pp.586-590
• /
• 2006

This paper deals with the application of a partial discharge (PD) test on low-voltage electrical and electronic devices, which is recently being accepted as a non-destructive and a effective dielectric test method. A comparative analysis combined with the Withstand Voltage Test (WVT) specified in IEC standards was carried out on low-voltage insulation transformers. The results showed that the WVT causes insulation degradation of the specimen during the test by applying high voltage. However, the PD test can be performed in ranges from 30 % to 50 % of the test voltage specified in the WVT. Therefore, the PD test is successfully applicable for a non-destructive test method on low-voltage electrical and electronic devices as a replacement of the WVT.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제52권8호
• /
• pp.359-364
• /
• 2003

Ageing characteristics of RTV coating materials by corona discharge have been studied. The hydrophobicity recovery of RTV coating materials with 300${\mu}{\textrm}{m}$ thickness was identical with a bulk silicone materials. The RTV coating materials hydrophobicity has been almost lost when its were discharged during 40 seconds by corona discharge of 10㎸, and recovered after about 45 hours. The resistivity of RTV coating materials has not been recovered after 45 hours, though after 80 hours the initiation resistivity value has been recovered up to 95%. There was no critical change of compounds(such as Si and Al) on RTV surfaces by the corona discharge treatment until 100 seconds. In the test of arc erosion, it was seen that the coating sample with silicone rubber as a base material have more longer burn-out time than other samples with FRP or glass base.