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보조 공동과 간극을 갖는 원통형 공동의 음향 전달 특성
정원태,강연준,김석현,Jeong, Won-Tae,Kang, Yeon-June,Kim, Seock-Hyun 한국음향학회 2010 韓國音響學會誌 Vol.29 No.3
본 논문에서는 원통형 공동계의 음향 전달 특성에 대하여 이론적으로 검토한다. 원통형 공동계는 성덕대왕 신종의 음향 공동을 단순화시킨 모델로, 주 공동, 보조 공동 및 간극으로 구성되어 있다. 주 공동 내부에 점음원을 주고 내부 및 외부 음장에서의 주파수 응답 특성과 음향 모드를 구하였다. 그 결과는 SYSNOISE를 이용한 경계요소 해석결과와 비교하여 타당성을 확인하였다. 제안된 이론모델을 이용하여 간극과 보조 공동이 음향계의 공명 주파수와 음향 전달 특성에 미치는 영향을 규명하였다. 마지막으로 음원 주파수를 공동 내부에서 외부로 가장 잘 전달시키는 보조 공동과 간극의 조합을 결정하였다. In this paper, acoustic transmission characteristics are theoretically considered on a cylindrical cavity system. The cylindrical cavity system is a simplified model of the acoustic cavity of King Seongdeok Divine Bell and it consists of a main cavity, a gap and an auxiliary cavity, Under a point sound source in the main cavity, acoustic frequency response property is determined and acoustic modes are analysed. The results are compared with those by the boundary element analysis using SYSNOISE. Using the proposed theoretical method, the effect of the auxiliary cavity and the gap on the resonance frequency and sound transmission characteristics is identified. Finally the best combination of the auxiliary cavity and gap is determined for the maximum transmission of the source frequency.
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.
잔류농약 분석의 정도관리를 위한 국내 숙련도시험 개선 방안
정원태(Won Tae Jeong),임흥빈(Heung Bin Lim),박상원(Sang Won Park),노현호(Hyun Ho Noh),경기성(Kee Sung Kyung) 한국농약과학회 2020 농약과학회지 Vol.24 No.4
Accredited analytical laboratories are required to participate in comparative proficiency testing(PT) as a means of quality assurance system in order to secure the reliability of the measurement results. Especially, since analysis of pesticide residues requires analysis results at a very trace level, a quality control system by proficiency test is essential. The main purpose of the general PT is comparison between experimental institutions, however operation methods such as test items and statistical methods are somewhat different depending on international standards and operating institution programs. In this review, various cases of PT conducted overseas were reviewed and compared to find alternative to improve the analytical capabilities of pesticide analysis laboratories in Korea. When the EUPT (European Commission Proficiency Test) and NMIJ (National Metrology Institute of Japan) were compared with the operating methods of Korean PT based on the literature of operation cases, we found the main differences in the number of pesticides subject to the target, the method of pesticide treatment, the method of analysis and follow-up management. The EUPT also applied the blind test for qualitative competency evaluation to enhance the analytical laboratory capacity. Consequently, it was suggested that the blinding method of not notifying the target pesticides to the participating institutions and the follow-up management system for participating institutions should be introduced. The PT for verifying the test method was also proposed. It is expected that the introduction of such cases into PT in Korea will help improve the quality control of the pesticide residue analysis laboratory.
잔류농약 분석 정도관리를 위한 상향식 측정불확도 추정방법 제안
정원태(Won Tae Jeong),박상원(Sang Won Park),노현호(Hyun Ho Noh),임흥빈(Heung bin Lim),경기성(Kee Sung Kyung),류송희(Song-Hee Ryu) 한국농약과학회 2021 농약과학회지 Vol.25 No.2
Measurement uncertainty is the expression of the statistical dispersion of the values attributed to the measurement value. The application of measurement uncertainty to the maximum residue limit (MRL) can be a means of preventing social repercussions caused by analytical errors. The estimation of “top-down” approaches for analysis of residual pesticides is recognized by practical and suitable approaches based on assumptions that simplify the process. However, the opposite approach, “bottom-up” is also needed to estimate the uncertainty of all individual components of the analytical procedure. This review delineated the method of estimating measurement uncertainty along with the determination of the need for uncertainty in each analysis process (sampling, standard, recovery, chromatography, linearity, weighting and Volumetric system) according to the ISO-GUM-based bottom-up approach. Furthermore, the measurement uncertainty was estimated assuming that alpha-endosulfate was detected in soybeans through the test method of organochlorine pesticides in Food Code. Consequently, it was shown the effect of the estimated expansion uncertainty on the residual acceptance criterion. The main uncertainties of the procedure were determined to be sample weight, volumertic apparatus, standard solution, linearity, and recovery through the fishbone diagram, the extended uncertainty is obtained from each relative standard uncertainty by multiplying the combined standard uncertainty by coverage factor.