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정원태,이인석,정혜정,Jung, Won-Tae,Lee, In-Suk,Jeong, Hae-Jeong 한국데이터정보과학회 1996 한국데이터정보과학회지 Vol.7 No.2
When we are estimate the smoothing parameter in spline regression model, we deal the diagnostic of influence observations as posteriori analysis. When we use Generalized Maximum Likelihood Function as the estimation method of smoothing parameter, we propose the diagnostic measure for influencial observations in the obtained estimate, and we introduce the finding method of the proper smoothing parameter estimate.
바나듐이 도핑된 강유전체 Bi₄Ti₃O_12 박막(BTV)의 성장과 특성
정원태,최은경,김현주,강민진,김상수 昌原大學校 基礎科學硏究所 2001 基礎科學硏究所論文集 Vol.13 No.-
Bi3.99Ti2.97V0.03O12 (BTV) thin films with 3 mol% vanadium doping were prepared on Pt/Ti/SiO2/Si substrate by sol-gel method. X-ray diffraction analysis indicated that single-phase lapered perovskite were obtained and preferred orientation was not observed. Under the annealing temperature at 600℃, the surface morphology of the BTV thin films had fine-rounded particles and then changed plate-like at 650℃ and 700℃. The remanent polarization (2Pr) and coercive field (2Ec) of 700℃ annealed BTV thin film were 25 μC/cm2 and 116 kV/cm, respectively. In addition, BTV thin film showed little polarization fatigue during 109 switching cycles. These improved ferroelectric properties were attributed to the increased rattling space and reduced oxygen vacancies by substitution Ti4+ ion (68 pm) with smaller V5+ ion (59 pm). The dielectric constant and loss were measured 130 and 0.03 at 10 kHz, respectively.
국내 잔류농약 분석실험실 숙련도 향상을 위한 토양 중 잔류농약 다성분분석 숙련도시험
정원태,노현호,류지혁,이효섭,김세인,김향희,정건희,홍수명 한국농약과학회 2022 농약과학회지 Vol.26 No.4
이 연구는 국내 잔류농약 분석실험실 대상으로 토양 중 잔류농약 다성분분석 숙련도시험을 수행하여 주요분석오류 요인을 규명하고 분석 결과 신뢰도 향상을 위한 방향성을 수립하고자 수행되었다 . 숙련도시험은 33개의 기관에서 참여하였으며 , 시료 제조 , 배포 , 결과 평가 등 모든 절차는 국립농업과학원에서 수행되었다 . 숙련도시험의 대상 농약은 bifenthrin, boscalid, chlorfenapyr, clothianidin, flubendiamide, fluopyram, fluquinconazole, imidacloprid, pendimethalin, procymidone이었으며 , 시료는 국제표준규격 (ISO 13528)에 따라 균질성 및 안정성을 평가한 후 시료를 배포하였다 . 또한 분석오류 원인을 규명하기 위하여 분석 결과와 함께 분석정보 (추출법 , 회수율 등)를 제출하도록요청하였다 . 수집된 분석 결과를 z-score로 환산하여 평가한 결과 농약별 만족율 (z-score의 절대값 2이하 )은 79~97% 로 나타났다 . 만족율이 가장 높은 가장 농약은 boscalid였으며 , chlorfenapyr가 가장 낮은 만족율을 보였다 . 대부분의참가기관은 토양 중 잔류농약분석 수행능력이 우수한것으로 판단되었으나 시료처리 과정에서 습윤화를 하지 않은참가기관에서 모든 성분에 대해 불만족 평가 (z-score의 절대값 3이상 )를 받았다 . 이러한 결과는 QuEChERS 방법을이용한 토양 중 잔류농약 분석에서는 습윤화가 필수적인 것으로 판단되었다 . 또한 분석자의 역량을 정확하고 신속하게 진단할 수 있는 평가기법을 확립하고 지속적인 숙련도시험 운영을 통해 분석자의 숙련도 유지 및 향상이 필요하다고 판단되었다 .
예치금 등 폐기물재활용을 위한 경제적 유인책의 활성화 방안
정원태,정재춘 한국환경정책학회 1995 環境政策 Vol.3 No.2
The situation of our country's household waste recycling rate in 1994 in reached only to 15.4 percent which is a very low numerical value because it indicates our daily waste disposition capacity as 8,927 ton /day. To improve our waste recycling rate our gorvernment is reinforcing depoait-refund systems in bottle. Currently the reinforcement of deposit-refund systems in bottle shows high success by achieving 9a.0 percent in recycling rate which has brought a great environmental effects. This survey is provided to inspect and to practice survey about the more possible charge systems including deposit-refund systems. Based on surveyed data, a variety of opinions regarding target subject of each system was col-lected and positive improvement plans were suggested through introducing econ-omic incentive system. Trough this study, following problems In deposit-refund systems were presented. -vagueness of selection basis according to the rate of deposit and vessels -negaeive attiude cased by the waste collect-treatment division's lack of recognition toward economic incentive -confined number of depesit-refund targets -vagueness for selection basis of item and omission of several deposit-refund targets -low application of principle of polluter payment due to low deposit rate. -Followings are the directions of improvement of deposit systems. -more positive utilization of econamic incentive -government's positive intervention in dispositing large-scaled waste which requires very difficult disposition -construction of collect-treatment system led by manufacturers and importers -utiligation of refund-regulation to outsiders -enforcement of advance notice of refund rate and deposit-refund targets -amended application of refund rate according to the result of waste recycling