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본문검색 결과만 보기
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Ku-대역 유전체 공진기 발진기의 Sampling Phase Detector를 이용한 위상 고정 루프 필터 설계 및 제작
오 바담가라와, 양승식, 오현석, 이만희, 정해창, 염경환, Badamgarav. O., Yang. Seong-Sik, Oh. Hyun-Seok, Lee. Man-Hee, Jeong. Hae-Chang, Yeom. Kyung-Whan 한국전자파학회 韓國電磁波學會論文誌 12 Pages
한국전자파학회 韓國電磁波學會論文誌 2008, Vol.19 No.10 1147-1158 (12 pages)
본 논문에서는 SPD(Sampling Phase Detector) 소자를 위상검출기로 사용하여, 기준 신호원 700 MHz SAW(Surface Acoustic Wave) 발진기에 16.8 GHz의 VTDRO(Voltage Tuned Dielectric Resonator Oscillator)를 안정화하는 위상 고정 회로를 설계하였다. 이러한 위상 고정 방법은 루프 필터만으로 직접적으로 위상 고정할 경우 잠금 시간(lock time)의 문제로, 루프 필터뿐만 아니라 구형파의 시변하는 전류원을 사용 위상 고정하게 된다. 이러한 구동 회로와 루프 필터는 서로 상관 관계가 있어, 이의 체계적인 조정을 필요로 한다. 본... -
Hybrid 검출방식을 적용한 삼상 선로 응동형 DVR(Dynamic Voltage Restorer) 개발
정종규, 한병문, Jeong. Jong-Kyou, Han. Byung-Moon 대한전기학회 전기학회논문지= The Transactions of the Korean Institute of Electrical Engineers 8 Pages
대한전기학회 전기학회논문지= The Transactions of the Korean Institute of Electrical Engineers 2009, Vol.58 No.10 1954-1961 (8 pages)
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A DPLL with a Modified Phase Frequency Detector to Reduce Lock Time
하산 타릭, 최광석, Hasan. Md. Tariq, Choi. GoangSeog 대한전자공학회 Journal of the Institute of Electronics Engineers of Korea 6 Pages
대한전자공학회 Journal of the Institute of Electronics Engineers of Korea 2013, Vol.50 No.10 76-81 (6 pages)
130nm CMOS 공정 라이브러리를 이용하여 125MHz로 동작하는 새로운 위상 주파수 검출기 기반 DPLL을 설계하였다. 이 DPLL은 중간 주파수대 응용을 위해 지터와 록 시간을 줄이려고 전형적인 DPLL에 반전 에지 검출기를 포함하고 있다. XOR 기반 반전 에지 검출기들은 출력을 보다 빨리 변화시키기 위하여 기준 신호보다 빠른 전이를 얻는데 사용된다. HSPICE 시뮬 레이터는 모의실험을 위해 Cadence환경에서 사용되었다. 제안된 위상 주파수 검출기를 가진 DPLL의 성능은 종래의 위상 주 파수 검출기를 가진 것의 성능과 비교하였다.... -
Development of a monoclonal antibody-based co-agglutination test to detect enterotoxigenic Escherichia coli isolated from diarrheic neonatal calves
Brajesh C. Varshney, N.M. Ponnanna, Pranati A. Sarkar, Pragna Rehman, Jigar H. Shah 대한수의학회 Journal of Veterinary Science 8 Pages
대한수의학회 Journal of Veterinary Science 2007, 제 8권 제 1호 9 57-64 (8 pages)
Escherichia coli (E. coli) strains were collected from young diarrheic calves in farms and field. Strains that expressed the K99 (F5) antigen were identified by agglutination tests using reference antibodies to K99 antigen and electron microscopy. The K99 antigen from a selected field strain (SAR-14) was heat-extracted and fractionated on a Sepharose CL-4B column. Further purification was carried out by sodium deoxycholate treatment and/or ion-exchange chromatography. Monoclonal antibodies to... -
Neuropharmacological effects of deltamethrin in rats
S. Manna, D. Bhattacharyya, T. K. Mandal, S. Dey 대한수의학회 Journal of Veterinary Science 4 Pages
대한수의학회 Journal of Veterinary Science 2006, 제 7권 제 2호 7 133-136 (4 pages)
This study examined the effect of deltamethrin on some of the neuropharmacological paradigms in a rat brain such as the motor co-ordination test using a rotarod, the pentobarbitone-induced sleeping time and pentylenetetrazole (PTZ)-induced convulsion as well as the gamma aminobutyric acid (GABA) level. Albino Wistar rats were used as the experimental animals. Different neuropharmacological paradigms such as the motor co-ordination by the rotarod, pentobarbitone-induced sleeping time and the... -
Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers
Jong-hwan Lim, Byung-kwon Park, Hyo-in Yun 대한수의학회 Journal of Veterinary Science 5 Pages
대한수의학회 Journal of Veterinary Science 2003, 제 4권 제 1호 6 35-39 (5 pages)
A highly sensitive and specific method for the determination of roxithromycin in broiler tissues by LC/MS was developed and validated. A dichloromethane extract of the sample was separated on C18 reversed-phase column with acetonitrile-50 mM ammonium acetate (80:20, v/v) as the mobile phase and analyzed by LC/MS via atmospheric pressure ionization/electrospray ionization interface. The limit of detection and limit of quantitation were 1 ng/g and 5 ng/g. The method has been successfully applied... -
Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry
Youn-Hwan Hwang, Jong-Hwan Lim, Byung-Kwon Park and Hyo-In Yun 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2002, 제 3권 제 2호 7 103-108 (6 pages)
Macrolides are frequently used in veterinary medicine as therapeutic and preventive agents for various diseases. It is difficult to determine macrolides simultaneously with conventional methods due to their similar structures. A simultaneous analysis for erythromycin, roxithromycin, tiamulin and tylosin with LC/MS has been developed. Separation was performed on C18 reversed phase column. Mobile phase was gradiently flowed with 10 mM ammonium acetate and methanol. The mass spectrometer was run in... -
Extremely Low Frequency Magnetic Field Modulates the Level of Neurotransmitters
YoonHeeChung, YoungJooLee, HoSungLee, SuJinChung, CheolHeeLim, KeonWoongOh, UyDongSohn, EonSubPark, JiHoonJeong 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.1 3 15-20 (6 pages)
This study was aimed to observe that extremely low frequency magnetic field (ELF-MF) may be relevant to changes of major neurotransmitters in rat brain. After the exposure to ELF-MF (60 Hz, 2.0 mT) for 2 or 5 days, we measured the levels of biogenic amines and their metabolites, amino acid neurotransmitters and nitric oxide (NO) in the cortex, striatum, thalamus, cerebellum and hippo-campus. The exposure of ELF-MF for 2 or 5 days produced significant differences in norepinephrine and vanillyl...
