http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 정동효(Dong-Hyo Jeong) (검색결과 14 건)
- 무료
- 기관 내 무료
- 유료
-
-
정동효(Dong-Hyo Jeong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
The switching-mode power converter has been widely used because of its features of high efficiency and small weight and size. These features are brought by the ON-OFF operation of semiconductor switching devices. However, this switching operation causes the surge and EMI(Electromagnetic Interference) which deteriorate the reliability of the converter themselves and entire electronic systems. This problem on the surge and noise is one of the most serious difficulties in AC-to-DC converter. Random Pulse Width Modulation (RPWM) is performed by adding a random perturbation to switching instant while output-voltage regulation of converter is performed. RPWM method for reducing conducted EM! in single switch three phase discontinuous conduction mode boost converter is presented. The more white noise IS injected, the more conducted EMI is reduced. But output-voltage is not sufficiently regulated. This is the reason why carrier frequency selection topology is proposed. In the case of earner frequency selection, output-voltage of steady state and transient state is fully regulated. A RPWM control method was proposed in order to smooth the switching noise spectrum and reduce it's level. Experimental results are verified by converter operating at 300V/1㎾ with 5%~30% white noise input. Spectrum analysis is performed on the Phase current and the CM noise voltage. The former is measured with Current Probe and the latter is achieved with LISN, which are connected to the spectrum analyzer respectively.
-
정동효(Dong-Hyo Jeong) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
Recently, a fuel cell is remarkable for new generation system. The fuel cell generation system converts the chemical energy of a fuel directly into electrical energy. The fuel cell generation is characterized by low voltage and high current. For connecting to utility, it needs both a step up converter and an inverter. The step up converter makes DC link and the inverter changes DC to AC. In this paper, full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation. In this paper, the 1.5㎾ active clamp current-fed full bridge converter employing MOSFETs is operated to discharge the battery whereas a voltage-fed half bridge converter employing IGBTs is operated to charge the battery.
-
정동효(Dong-hyo Jeong) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
Recently, a fuel cell is remarkable for new generation system. The fuel cell generation system converts the chemical energy of a fuel directly into electrical energy. The fuel cell generation is characterized by low voltage and high current. For connecting to utility, it needs both a step up converter and an inverter. The step up converter makes DC link and the inverter changes DC to AC. In this paper, full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation.
-
-
-
-
-
이정연,정동효,김우연,Lee, Jeong-Yeon,Chung, Dong-Hyo,Kim, Woo-Yeon 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6
대두 종자 저장 단백질의 일종인 ${\beta}-conglycinin$ ${\alpha}'$ subunit 유전자의 upstream 지역에 결합하여 전사 조절에 관여하리라 추정되는 대두 핵의 DNA 결합 단백질을 조사하기 위하여 대두 핵 추출물과 S-100을 조제하였다. 염기서열이 AACCCA-27 bp-AACCCA인 합성 DNA를 pUC19에 클로닝한 플라스미드 pSE3를 EcoRI과 HindIII로 절단하여 절편을 분리하고 $^{32}P$ 로 표지하여 이를 gel mobility shift assay 탐침으로 이용한 결과, 대두 핵의 DNA 결합 단백질의 일종인 SEF3(soybean embryo factor 3)의 역가가 핵 추출물과 S-100에서 검출되었다. 각각 CATGCAT, AACACA 염기 서열을 가지는 DNA를 탐침으로 이용하여 SEF3 이외의 DNA 결합 단백질의 역가를 조사한 결과 대두 핵 추출물과 S-100에서 각기의 염기 서열에 결합하는 수 종의 DNA 결합 단백질이 확인되었으나 두 시료에서 공통된 양상을 보여주는 DNA 결합 단백질의 역가는 확인되지 않았다. 또한 대두 S-100의 경우에는 개화 후 32일 부근에 SEF3 역가가 검출되는 데에 비하여, 핵 추출물에는 20일 전후에 SEF3 역가가 나타나서 32일 부근에 역가가 현저히 증가하였다. Soybean nuclear extracts and S-100 were prepared to examine the soybean embryo factors which bind to the upstream region of soybean ${\beta}-conglycinin$ ${\alpha}'$ subunit gene. SEF3(soybean embryo factor 3), which is presumed to be a trans-acting factor for the expression of the gene, was detected in gel mobility shift assay using the DNA probe containing two AACCCA hexanucleotides. DNA probe containing CATGCAT or AACACA was used to find any other soybean embryo factor interacting with the upstream region of ${\beta}-Conglycinin$ ${\alpha}'$ subunit gene. It was found that there was no common DNA binding protein detected both in nuclear extracts and S-100. The relative levels of SEF3 binding activity both in nuclear extracts and S-100 of maturing soybean seeds were determined. SEF3 activity of nuclear extracts was first detected around 20 days after pollination and significantly increased around 32 days after pollination.
-
대두 β - conglycinin 유전자 발현의 전사 조절에 관한 연구 (Ⅰ) 대두 β - conglycinin 유전자의 upstream 영역에 결합하는 대두 배 인자의 동정
이정연(Jeong Yeon Lee),정동효(Dong Hyo Chung),김우연(Woo Yeon Kim) 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6
Soybean nuclear extracts and S-100 were prepared to examine the soybean embryo factors which bind to the upstream region of soybean β-conglycinin α` subunit gene. SEF3(soybean embryo factor 3), which is presumed to be a trans-acting factor for the expression of the gene, was detected in gel mobility shift assay using the DNA probe containing two AACCCA hexanucleotides. DNA probe containing CATGCAT or AACACA was used to find any other soybean embryo factor interacting with the upstream region of β-conglycinin α` subunit gene. It was found that there was no common DNA binding protein detected both in nuclear extracts and S-100. The relative levels of SEF3 binding activity both in nuclear extracts and S-100 of maturing soybean seeds were determined. SEF3 activity of nuclear extracts was first detected around 20 days after pollination and significantly increased around 32 days after pollination.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
