• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제52권1호
• /
• pp.19-24
• /
• 2003

Design and test results of a VRAG(Vacuum Rotary Arc Gap) switch were presented. To control the damage of electrodes caused by the vacuum arc, Lorentz's force by the radial magnetic field between spiral electrodes was used to rotate the vacuum uc. VRAG switch electrodes were made of the material of CuCr and OFHC. Gap distance between two spiral type electrodes for the rotation of the arc discharge is 8, 10, 12mm. In the cathode, one trigger electrode was inserted into each spiral wing. Normal operation of the VRAG switch was confirmed with 10.6[$mutextrm{s}$]of trigger delay and 2~3[$mutextrm{s}$] of the jitter time. The speed of the vacuum arc was measured to be 0.6 ~ 1[km/s] by a motion analyzer.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2017년도 전력전자학술대회
• /
• pp.564-576
• /
• 2017

${\cdot}$ GaN E-HEMT provides superior performance vs. Si MOSFET or IGBT, and also superior performance vs. SiC, below ~1200V ${\cdot}$ GaN E-HEMT is replacing Si MOSFET and IGBT in major application segments, and Industry Adoption will accelerate ${\cdot}$ Technology advances in GaN E-HEMT have made high-current true Normally-Off devices available in current ranges from 7A to 250A ${\cdot}$ While GaN has improved Properties vs. SiC or Si, different types of GaN devices offer different levels of performance or robustness ${\cdot}$ JEDEC Industrial-Grade Qualification of GaN E-HEMTs has been achieved, and Automotive Qualification is in progress.

• 건축역사연구
• /
• 제25권2호
• /
• pp.45-56
• /
• 2016

The purpose of this study is to analyze the evolutionary process of Ddeulzip. The subject of this study is a clan family of Andong Kwon in Andong Area. Ddeulzip's evolutionary process of the construction and management is divided into largely three periods in Josun Dynasty. The establishment and changing process of Ddeulzip for Andong Kwon's family are analyzed according to three periods called the early(15~16C), mid(17~18C) and late(19~20C). The characteristics of the early and mid period are that they created their own ancestral building form of Ddeulzip. Those of the late period are in their strong will to make similar scale of Ddeulzip. And during the late period, although the construction of new Ddeulzip was started in the early stage, no more formation of Ddeulzip was made as it approached toward the late stage. And most important point is similar constructional space(gan) of first time. The residential Ddeulzip of Andong Kwon's family created at the 19C can be regarded as an representative example of large space that shows a typical form of housing by noble residents at the time.

• 대한미생물학회지
• /
• 제19권1호
• /
• pp.79-83
• /
• 1984

To determine the existence of anti-HLA antibodies finally in 220 human placental extracts to be proved negative antiserum by previous anti-HLA A,B,C antibody screening procedure, the present study was performed by fractionation of immunoglobulins using saturated ammonium sulfate and by simple batch method on DEAE cellulose. Thereafter using known 150 T-lymphocyte panels, complement-dependent microlymphocytotoxicity test was performed to observe the existence of anti-HLA antibodies and the degree of the antibody response of the concentrates. The following results were obtained: 1. Of total 141 placental sera concentrated 45 cases(31.9%) were showed significant anti-HLA A,B,C antibody response after concentration(Excellent, 19(13.5%), Good, 3(2.1%), Weak, 23(16.3%)). 2. Anti-HLA specificities of placental sera obtained after concentration were A2, A24, B13, B27, B44, B51, CN1, C7. 3. A new type C new-1 anti-HLA antibody that is only expressed in Korean people, was obtained. 4. 79 placental sera purrified by simple batch method using DEAE cellulose were showed negative anti-HLA antibody responses.

• 방송공학회논문지
• /
• 제25권1호
• /
• pp.1-12
• /
• 2020

의료분야에서 질환별 유병률 차이로 인한 데이터 수적 불균형은 흔하게 발생되는 문제로 인공지능 학습 성능을 저하시켜 개발의 어려움을 초래한다. 최근 이러한 데이터 수적 불균형문제를 해결하기 위한 한 방법으로 적대적 생성 신경망(GAN) 기술이 도입되었고 다양한 분야에 성공적으로 적용되어왔다. 그러나 수적 불균형에 의해 저하된 성능 문제를 해결하는데 있어서 기존 연구들의 영상 해상도가 아직 충분하지 않고 영상 내 구조가 전역적으로 일관성 있게 모델링 되지 않아 좋은 결과를 얻기 어렵다. 본 논문에서는, 흉부 X선 영상 데이터의 수적 불균형문제를 해결하기 위하여 고해상도 영상을 생성할 수 있는 주목 메커니즘 기반 멀티 스케일 조건부 적대적 생성 네트워크를 제안한다. 해당 네트워크는 질환제어 조건변수에 의해 하나의 네트워크만으로 다양한 질환 영상을 생성할 수 있어 각 클래스별로 학습을 하는 비효율성을 줄였고, 자기 주목 메커니즘을 통해 영상 내 장거리 종속성 문제를 해결하였다.

• 한국정보통신학회논문지
• /
• 제6권8호
• /
• pp.1241-1250
• /
• 2002

육상과 해상 선박간의 통신은 육상 내에서의 통신과는 비교가 되지 않을 정도로 열악한 통신환경과 비싼 통신요금 체제를 가지고 있다. 해상의 경우 4800-9600bps의 통신 속도가 주류를 이루고 있지만, 이것마저 통신요금이 고가이기 때문에 마음껏 쓰지 못하고 있으며, 해상 통신의 특성을 잘 이해하지 못해 여러 가지 응용 어플리케이션 개발이 힘든 상황이다. 또한 고가의 효율적이지 못한 외국제품을 수입하여 사용함으로써 가장 기본이 되는 통신 인프라마저 외국에 의존해야 하는 실정이다. 따라서 본 논문에서는 기존 외국제품(Netverk, Marinet, Amosmail)의 벤치마킹 결과와 수요업체(KT(구, 한국통신) 위성사업부, 범양상선, 시도상선, 펜타텍, 한진 등)의 요구사항을 검토하여 얻어진 결과인 1) 통신 요금절감, 2) 업무용 프로그램과 연계, 3) 선박 사용자의 편리성, 4) 육상 서버 관리 기능에 초점을 맞추어 선박과 육상간의 E-Mail 시스템을 개발하였다.

• 건축역사연구
• /
• 제18권2호
• /
• pp.65-83
• /
• 2009

This research was to analyze the direction ideas of residential Feng Shui. In ancient China residential places were been established by Xiangzhai(相宅) and Buzhai(卜宅) usages. And ancient Chinese always considered geographical features of mountains and waters for setting up their living places. Geographical features were also considered importantly ih representative residential Feng Shui books, Zhaijing(宅經) and Yangzhaisanyao(陽宅三要). In Zhaihing, 24 direction ideas are co-related with Fagui(八卦) and GanZhi(千支) theories, and they are most important residential Feng Shiui direction theories. The basic thoughts of 24 direction ideas of Zhaijing were already formed in Qin(秦) dynasty and modified in early Han(漢) dynasty. In Zhaijing, residential places were splited into Yangzhai(陽宅) and Yinzhai(陰宅) according to YinYang's Qi directions. Those were actually formed from meticulous observations on changing processes of YinYangWuXing(陰陽五行)'s Qi(氣). Constantly changed Qi of YinYangWuXing were studied by old chinese people from the observations on the sun, the moon, the five stars, the Great Bear, and ErShiBaXiu(二十八宿). The origin of Zhaijing's direction ideas is the direction system of ShiPan(式盤) in Qin and Han dynasty. On ShiPan TianGan(天干) Dizi(地支) Fagui TianDiRenGui(天地人鬼) were arranged very systematically into four and 24 directions. DongxiSizhai(東西四宅) theories of Yangzhaisanyao had edited more lately than Zhaijing(宅經), and formed according to Fagui(八卦)'s YinYang(陰陽) principles. But the basic ideas is same with Zhaihing's. It proves that residential Feng Shui theories were constantly improved and modified. And both residential Feng Shui direction ideas of Zhaijing and Yangzhaisanyao are the gentral ideas in old china. The point of that ideas is Sky's four or 24 directions are correspndence with the earth's. It came from the traditional thoughts that Heaven, Earth, and mankind are c0-related and influenced each other according to Qi's changing processes. Gather up above mentioned, the direction ideas of residential Feng Shui is a systematic thoughts of old chinese for harmonizing Tian-Di-Ren-Gui, and is their specific methods for harmonizing the nature's Qi, mankind and spirits.

• 건축역사연구
• /
• 제23권2호
• /
• pp.25-37
• /
• 2014

The purpose of this study is to analyze the evolutionary process of Ddeulzip. The subject of this study is a clan family of Euisung Kim in Andong Area. Ddeulzip's evolutionary process in the construction and management is divided into largely three periods. The establishment and changing process of Ddeulzip for Euisung Kim's family are analyzed according to three periods called the early (15~16C), mid(17~18C) and late(19~20C). The characteristics of the early period are that they created their own ancestral building form of Ddeulzip. Those of the mid period are in their strong will not only to preserve their on ancesteral housing but also to make additional construction of Ddeulzip. And during the late period, although the construction of new Ddeulzip was started in the early stage, no more formation of Ddeulzip was made as it approached toward the late stage. And most important point is smaller construction space (gan) dan first time. The residential Ddeulzip of Euisung Kim's family created at the start of Chosun Dynasty can be regarded as an representative example that shows a typical form of housing by noble residents at the time.

• The Korean Journal of Ceramics
• /
• 제5권3호
• /
• pp.239-244
• /
• 1999

Ultrafine lead magnesium niobate $Pb(Mg_{1/3}Nb_{2/3}) O_3$ (PMN) powders have been successfully prepared via a micro-emulsion processing technique. By stepwise hydrolysis using aqueous as the precipitant, hydroxide precursor was obtained from nitrate solutions dispersed in the nanosized aqueous domains of a microemulsion consisting of cyclohexane, non-ionic surfactant (NP5+NP9) and an aueous phase. Upon calcination of the microemulsion-derived precursor at $800^{\circ}C$, PMN powders with 100% perovskite phase was obtained.

• 생약학회지
• /
• 제20권1호
• /
• pp.21-24
• /
• 1989

A new method for quantitative determination of icariin in Epimedii Herba by high performance liquid chromatography was established. A reversed-phase system with $a\;{\mu}Bondapak\;C_{18}$ column using methanol in water(15% to 70%, gradient elution) as a mobile phase was developed. Icariin and spinosin as an internal reference were detected at 350 nm and the analysis was successfully carried out within 30 min.