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장기창 ( Jang Gi Chang ),김성철 ( Kim Seong Cheol ),송은영 ( Song Eun Yeong ),김공호 ( Kim Gong Ho ),권혁모 ( Kwon Hyeog Mo ),강상헌 ( Kang Sang Heon ),박기훈 ( Park Gi Hun ),정용환 ( Jeong Yong Hwan ) 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.3
In order to isolate antibacterial substances from the rhizome of Zingiber mioga Roscoe, the ethanol extracts was fractionated according to the activity against Bacillus subtilis B. cereus and Staphylococcus aureus. Three antibacterial substances were isolated and purified by column chromatography and recrystallization. Compounds Ⅰ and Ⅲ showed activity against all the tested bacterias and compound Ⅱ exhibited the activity against B. subtilis and B. cereus except S. aureus. Compound I was examined antimicrobial activity aginst B. .subtilis, B. cereus and S. aureus by optical density using Bioscreen C Compound I showed strong growth inhibition at 10 ppm on B. subtilis and B. cereus for 72 hrs, and at 25 ppm on s. aureus. On the basis of spectrometric studies including ¹H-NMR, ^(13)C-NMR, DEPT, 1H-1H COSY, HMQC, HMBC and IR, compounds Ⅰ, Ⅱ and Ⅲ were identified ai (E)-8β(17)-epoxylabd-12-ene-15,16-dial (C_(20)H_(30)O₃, MW=318), galanolactone (C_(20)H_(30)O₃, MW=318) and galanal A(C_(20)H_(30)O₃, MW=318), respectively. These results are the first reports on the isolation (E)-8β(17)-epoxylabd-12-ene-15,16-dial, galanolactone and galanal A from the rhizome of Zingiber mioga.
정전압 및 정전류 제어를 위한 1차 측 제어 방식 Flyback 컨트롤러 설계
장기창(Kichang Jang),황원준(Wonjoon Hwang),성동훈(Donghoon Seong),전현덕(Hyeondeok Jeon),최중호(Joongho Choi) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
This paper presents a flyback converter with primary-side regulation controller. The designed controller can perform for constant-voltage (CV) and constant-current (CC) control. The controller has switching frequency range of 85kHz to 180kHz, and operates input voltage range of 90VRMS to 260VRMS. The efficiency of flyback converter with designed controller can be achieved up to 89.9%. The controller IC is designed in a 0.35um BCD process and occupies a core size of 0.76㎟.
장기창,Jang, Gi-Chang 대한건축사협회 1983 建築士 Vol.1983 No.9
본보고서는 82년도 연구결과에 대하여 동년 12월에 본 연구소 연구발표회시에 발표한 내용을 정리 · 소개하는 것으로서 연구 및 시험결과에 따라 시험방법을 제정하여 시행중에 있음.
Digital PFC Controller를 위한 Algorithmic ADC 설계
장기창,김진용,황상훈,최중호,Jang, Ki-Chang,Kim, Jin-Yong,Hwang, Sang-Hoon,Choi, Joong-Ho 한국전기전자학회 2012 전기전자학회논문지 Vol.16 No.4
본 논문에서는 Digital PFC Controller에 적합한 11비트 100KS/s의 Algorithmic ADC를 설계하였다. 설계한 Algorithmic ADC는 PFC controller에 적합한 11비트 해상도를 만족하면서 반복적인 순환구조의 동작으로 인해 전체 크기를 줄일 뿐 아니라 소비 전류를 최소화 할 수 있다. 본 논문의 Algorithmic ADC는 0.18um 1Poly-3Metal의 CMOS 공정으로 제작 되었으며 100KS/s의 동작 속도에 SNDR 66.7dB, ENOB 10.78비트의 성능을 가진다. 또한 소비전류는 5V 전원 전압에서 780uA이며 설계된 ADC의 칩 면적은 $0.27mm^2$이다. A 11b 100KS/s Algorithmic ADC for Digital PFC controller is proposed. The proposed Algorithmic ADC structure for 11bit resolution is based on a cyclic architecture to reduce chip area and power consumption. The prototype Algorithmic ADC implemented with a 0.18um 1Poly-3Metal CMOS process shows a SNDR 66.7dB and ENOB 10.78bits. And the current consumption is about 780uA at 100KS/s and 5V. The occupied active die area is $0.27mm^2$.