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고속 위상 동기 루프를 위한 새로운 구조의 위상/주파수 검출기
전상오,정태식,김재석,최우영 대한전자공학회 1998 電子工學會論文誌, C Vol.c35 No.8
New types of PFD (phase-frequency detector) are proposed with reset time and propagation delay reduced. The perfomrance of our proposed PFDs are confirmed by SPICE simulation with 0.8.mu.m CMOS process parameter. As a result of simulation, the reset time of PFDs are 0.32 nsec and 0.030 nsec in capture-process. The proposed PFDs can be used in hihg-speed phase-licked loop (PLL).
농식품 환경 분야(PF) : PF-13 ; 두 지역에서 재배된 배 중 Fenitrothion과 Myclobutanil의 잔류 패턴
전상오 ( Sang Oh Jeon ),황정인 ( Jeong In Hwang ),전영환 ( Young Hwan Jeon ),이상협 ( Sang Hyup Lee ),김장억 ( Jang Eok Kim ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
It is important to investigate biological half-lives (t1/2) of pesticides for predicting their residual amounts at harvest time. In this study, dissipation patterns of fenitrothion and myclobutanil were studied in two pear orchards, Yeongcheon (YC) and Gyungju (GJ), and pre-harvest residue limits (PHRLs) for the pesticides in pears were calculated using their half-lives. The residual amount of fenitrothion in YC pear at the harvest time slightly exceeded its maximum residue limits (MRLs) which is 0.20 mg/kg, whereas that in GJ pear was below MRLs. In case of myclobutanil, the residual amounts were below MRLs in pears of both regions. The dissipation constants of fenitrothion in YC and GJ pears were 0.055 (t1/2 = 12.6 days) and 0.040 (t1/2 = 17.3 days), respectively, and those of myclobutanil were 0.025 (t1/2 = 12.6 days) and 0.097 (t1/2 = 17.3 days), respectively. According to the calculated PHRLs, if the residual amounts of fenitrothion and myclobutanil in pears were 0.48~0.67 mg/kg and 1.20~ 1.69 mg/kg, respectively, at 10 days prior to the harvest, their residue amounts in pears at the harvest time would be below the MRLs.
04 포스터 발표 : 환경 화학 분야(PC) ; PC-04 : 미나리와 들깻잎 중 살균제 Boscalid의 잔류특성 비교
전상오 ( Sang Oh Jeon ),황정인 ( Jeong In Hwang ),이상협 ( Sang Hyeob Lee ),경기성 ( Kee Sung Kyung ),김태화 ( Tae Hwa Kim ),권찬혁 ( Chan Hyeok Kwon ),손영욱 ( Yeong Uk Son ),김동술 ( Dong Sool Kim ),김장억 ( Jang Eok Kim ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Different growth type of crops is one of major factors determining residual patterns of pesticides in them. In this study, residual characteristics of boscalid in water dropworts (WD) and perilla leaves (PL) which are different in leaf size were investigated. Commercial boscalid (49.3%, WP) was sprayed 2 or 3 times at interval of a week prior to harvest, and crop samples were collected at both final application and harvest days. Residual amounts of boscalid in the WD and PL were analyzed using GC-ECD, and recovery rates of boscalid spiked with 0.1 and 0.5 mg/kg on the WD and PL ranged from 91.8 to 111.0%. Initial residual amounts of boscalid were 20.3-44.5 mg/kg in WD and 101.6-138.7 mg/kg in PL. These results show that initial amounts of boscalid deposited on PL may be 4 folds larger than those in WD, when assuming that weights of the WD and PL are same. At the harvest day, residual amounts of boscalid in WD and PL decreased by 35.6% (13.0-28.9 mg/kg) and 21.1% (88.2-98.6 mg/kg), respectively, of the initial residual amounts. Pesticides applied on PL, which has wide leaves, may have larger residual amount and longer persistency than those on WD.
소면적 재배 작물 들깻잎 중 살충제 Bifenthrin과 Chlorfenapyr의 잔류양상
전상오 ( Sangoh Jeon ),황정인 ( Jeongin Hwang ),김태화 ( Taehwa Kim ),권찬혁 ( Chanhyeok Kwon ),손영욱 ( Yeonguk Son ),김동술 ( Dongsool Kim ),김장억 ( Jangeok Kim ) 한국환경농학회 2015 한국환경농학회지 Vol.34 No.3
BACKGROUND: It is important to understand residual patterns of pesticides applied on crops for ensuring their safety in agricultural products. However, there are few studies on the residual patterns of pesticides in minor crops, which are small in cultivation area. In this study, residual amounts of bifenthrin and chlorfenapyr sprayed on perilla leaf as a minor crop were investigated to know their residual patterns. METHODS AND RESULTS: Bifenthrin and chlorfenapyr were sprayed 2 or 3 times on perilla leaves at a week interval prior to harvest, and the perilla leaves were collected at 0, 1, 3, 5 and 7 days after the final application of pesticides. Recoveries for residual analysis of pesticides spiked on perilla leaves with concentrations of 0.1 and 0.5 mg/kg were 81.9-104.8%. The residual amounts of pesticides interpreted using first order kinetics model show that dissipation constants of bifenthrin and chlorfenapyr in perilla leaves were 0.0724-0.0535 and 0.0948-0.0821 day-1, respectively. In addition, the dissipation half-lives in perilla leaves were 9.6-12.9 days for bifenthrin and 7.3-8.4 days for chlorfenapyr. When pre-harvest residue limits (PHRL) of bifenthrin and chlorfenapyr at 10 days before harvest calculated on the basis of the dissipation constants and maximum residue limits of the pesticides were calculated as 17.1 for bifenthrin and 15.9 mg/kg for chlorfenapyr. CONCLUSION: Therefore, the PHRL calculated using the time-dependant residual patterns of pesticides in perilla leaves and their regression analysis may be used as experimental evidences in order to ensure the safety of pesticides in perilla leaves before harvest.
GHz급 charge-pump PLL응용을 위한 루프 필터 설계
정태식,전상오 대한전자공학회 1997 電子工學會論文誌, C Vol.c34 No.11
Charge-pump loop filter was designed using GaAs MESFET for GHz-range PLL system applications. Characteristics of charge-pump loop filter and stability of charge-pump PLL, system were analyzed. Performance specifications were defined and a charge-pump loop filter was designed that satisfies these specifications.