http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개별검색 DB통합검색이 안되는 DB는 DB아이콘을 클릭하여 이용하실 수 있습니다.
통계정보 및 조사
예술 / 패션
<해외전자자료 이용권한 안내>
- 이용 대상 : RISS의 모든 해외전자자료는 교수, 강사, 대학(원)생, 연구원, 대학직원에 한하여(로그인 필수) 이용 가능
- 구독대학 소속 이용자: RISS 해외전자자료 통합검색 및 등록된 대학IP 대역 내에서 24시간 무료 이용
- 미구독대학 소속 이용자: RISS 해외전자자료 통합검색을 통한 오후 4시~익일 오전 9시 무료 이용
※ 단, EBSCO ASC/BSC(오후 5시~익일 오전 9시 무료 이용)
This research is a development of BIM sample drawing and document set that is to be loaded on online architectural permission system. BIM drawing templates are not standardized so that each domestic architectural design firm has their own template. Non-standardized BIM template leads to lack of criteria not only for making integrated drawings but also for making each discipline's drawings. To overcome this situation, this research suggests standard BIM drawing templates. By offering sample drawings and guidelines for building permission to ordering organization and related companies, it increases understanding of BIM design and promotes design efficiency improvement.
본 논문에서는 동봉과 탄소접지극을 매설하여 저주파수 구형파, 표준 뇌임펄스 및 급준파 펄스에 따른 접지임피던스 응답특성에 대하여 기술하였다. 접지임피던스의 측정은 IEEE Std. 81.2에서 규정하고 있는 전위강하법을 적용하였으며, 인가전류에 따른 전위상승을 측정함으로써 임피던스를 산출하였다. 1 [m] 간격의 정삼각형으로 배치한 3연접 동봉과 0.8 [m] 깊이에 매설한 탄소접지극을 사용하여 실험을 수행하였다. 실험 결과, 접지임피던스는 주파수에 비례하는 특성이 나타났으며, 고주파수 영역에서는 3연접 동봉이 탄소접지극에 비해 더 낮은 임피던스 응답특성을 보였다. This paper describes the ground impedance on copper- and carbon-electrode by the application of a low frequency square waveform, a standard lightning impulse, and a fast-rise step pulse. The ground impedances were measured using the fall-of-potential method specified in IEEE Std. 81. 2. and were calculated as the ratio of the peak potential rise to the peak injection current at same time. Two types of grounding systems buried at a depth of 0.8 [m] were compared ; a three linked copperelectrodes of equilateral triangles with 1 [m] spacing and a carbon-electrode. Experimental results showed that the ground impedances increased with the applied frequency, and the three linked copper-electrodes had a lower impedance compared to the carbon-electrode in high frequency range.
In measurement of risk voltages; the step and touch voltage the distance between the current electrode and the ground electrode recedes up to several hundred meters as the scale of grounding system increases. This paper dealt with the measurement method of risk voltage in a restricted space. The risk voltage was analyzed depending on the distance and the direction of the current electrode from the ground electrode in a 10 [m] * 10 [m] mesh grounding system. The average value of risk voltages measured at a point 20 [m] away from the current electrode was deviated below 5 [%] from that measured at 100 [m] point. Consequently the evaluation of risk voltage of a large-scale grounding system buried in a spatially restricted place is available if the current electrode is installed in symmetry to the ground electrode.
This paper dealt with the frequency component analysis of acoustic signals produced by corona and series-arc discharges as a diagnostic technique for closed-switchboards. Corona and series-arc discharge were simulated by a needle-plane electrode and an arc generator specified in UL1699, respectively. Acoustic signal was detected by a wideband acoustic sensor with a frequency bandwidth of 4 Hz~100 kHz (-3 dB). We analyzed frequency spectrums of the acoustic signals detected in various discharge conditions. The results showed that acoustic signals mainly exist in ranges from 30 kHz to 60 kHz. From the experimental results, an acoustic detection system which consists of a constant current power supply (CCP), a low noise amplifier (LNA) and a band pass filter was designed and fabricated. The CCP separates the signal component from the DC source of acoustic sensor, and the LNA has a gain of 40 dB in ranges of 280 Hz~320 kHz. The high and the low cut-off frequency are 30 kHz and 60 kHz, respectively. We could detect corona and series-arc discharges without any interference by the acoustic detection system, and the best frequency is considered in ranges of 30 kHz~60 kHz.