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주병규,김문수,김현구,김동수,김영록,정도환,양재하,박선화,김태승,Ju, Byoung Kyu,Kim, Moon Su,Kim, Hyun Koo,Kim, Dong Su,Kim, Young Rok,Jeong, Do Hwan,Yang, Jae Ha,Park, Sun Hwa,Kim, Tae Seung 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3
In order to study gross alpha analysis method using LSC, the efficiency tests with uranium standard materials were performed and then compared with the GPC method (US EPA 900.0 method) using 15 groundwater samples. For 15 groundwater samples, the average efficiencies of the GPC and LSC method were 7~11% and 90%, respectively. The average precisions of the GPC and LSC method were 16.16% and 6.00%, respectively. Also, The average standard deviations for 15 samples were 7.38 pCi/L and 2.95 pCi/L, respectively. The determination coefficient of the tested results by two methods was 0.9948. As a result, the LSC method tested in this study was applicable for the screening of the gross alpha and showed the advantages in the gross alpha measurement due to the simple measurement procedures.
주병규,정승우,송충현 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12
Benzene과 Methyl tert buthyl ether(MTBE)의 기본적인 용해 특성을 파악하기 위해 마이크로 모델을 이용한 소규모 실험을 진행하였다. 실험은 Benzene단독 용해, MTBE 단독 용해, Benzene+MTBE(2:1혼합) mixture용해로 나누어서 진행하였다. 실험 변수는 주입하는 유체의 유량을 변화시켜 시간에 따른 농도, saturation을 분석하였다. 실험결과 Benzene의 경우 용해특성은 주입유량과 접촉시간에 따라 큰 영향을 받는 것으로 파악되고 MTBE와 Benzene+MTBE mixture보다 오랜시간 동안 잔여하며 용해되는 것으로 파악되었다. MTBE단독 용해의 경우 연구된 세 물질중 가장 빠르게 용해되는 것으로 나타났다. Benzene+MTBE mixture의 경우 세 물질중에서 중간정도의 빠르기로 용해되는 것으로 나타났다. 이 결과는 혼합물질의 구성성분이 다른 물질의 용해특성에 영향을 준다는 것을 알 수 있다. 본 연구결과는 오염확산이해 및 LNAPL복원기술의 기초자료로 이용될 수 있을 것이다.
국내 변성암 지역 음용지하수 중 자연방사성물질(<sup>238</sup>U, <sup>222</sup>Rn)의 환경 특성 연구
주병규,김문수,정도환,홍정기,김동수,노회정,윤정기,김태승,Ju, Byoung Kyu,Kim, Moon Su,Jeong, Do Hwan,Hong, Jung Ki,Kim, Dong Su,Noh, Hoe Jung,Yoon, Jeong Ki,Kim, Tae Seung 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.3
This study has investigated naturally occurring radioactive materials (N.O.R.M; $^{238}U$, $^{222}Rn$) for 353 drinking groundwater wells in metamorphic rock areas in Korea. Uranium concentrations ranged from N.D (not detected) to 563.56 ${\mu}g/L$ (median value, 0.68 ${\mu}g/L$) and radon concentrations ranged from 108 to 11,612 pCi/L (median value, 1,400 pCi/L). Uranium and radon concentrations in the groundwater generally are similar to USA with similar geological setting. Uranium concentrations in 9 wells (2.6%) exceeded 30 ${\mu}g/L$, which is the maximum contaminant level (MCL) by the US environmental protection agency (EPA), radon concentrations in 46 wells (13%) exceeded 4,000 pCi/L, which is the Alternative MCL (AMCL) by the US.EPA. The log-log correlation coefficient between uranium and radon was 0.32. The correlation coefficient between uranium and pH was 0.12 and the correlation coefficient between radon and temperature was -0.01. The correlation coefficient between uranium and $HCO_3$ was 0.09 and the correlation coefficient between uranium and Ca was 0.11. The median value of uranium was high Chung-Buk (1.78 ${\mu}g/L$), Gyeong-Buk (1.37 ${\mu}g/L$), In-Cheon (1.06 ${\mu}g/L$) for each province. On the other hand, the median value of radon was high In-Cheon (2,962 pCi/L), Chung-Buk (2,339 pCi/L), Jeon-Buk (2,165 pCi/L) for each province. Jeon-Buk for log-log correlation coefficient is the highest (0.63) among provinces.
CFD 기반 인공신경망을 이용한 로터 블레이드 최적 설계 프레임워크 개발
주병규,정용수 한국항공우주학회 2024 韓國航空宇宙學會誌 Vol.52 No.4
본 연구에서는 ANN 모델 기반의 C81 table 자동생성 모듈과 회전익 통합 해석 코드인 PRASADUM 그리고 다목적 유전 알고리즘을 통합하여 로터 블레이드 최적 설계 프레임워크를 개발하였다. 다목적 최적화를 통해 헬리콥터의 제자리 비행과 전진 비행을 모두 고려할 수 있으며, 이를 UH-60A 헬리콥터의 로터에 적용하여 공력 최적화를 수행하였다. 블레이드 끝단의 3개 섹션에 대한 에어포일과 블레이드 비틀림각을 동시에 최적화하였을 때 가장 큰 폭의 공력 성능이 개선됨을 보였으며, 제자리 비행에서 0.95% 전진비 0.3의 전진 비행에서 9.6%의 로터 파워가 감소하였다. 에어포일과 블레이드 비틀림 분포 최적화를 통해 전진부 블레이드 끝단과 영역에 대한 항력이 감소하였고, 이로 인해 로터의 파워가 감소됨을 확인하였다. 또한, 목적함수로 고려한 비행 조건 외에 다른 비행 영역에서도 로터 파워가 감소하였으며, 도출된 로터 블레이드에 대한 분석을 통해 검증을 수행하였다. A framework for optimizing rotor blade design has been developed, incorporating the Artificial Neural Network-based C81 table module, the rotorcraft comprehensive analysis code PRASADUM, and a multi-objective Genetic Algorithm. The design objective is to minimize the main rotor power of the helicopter in both hover and forward flight conditions, with an advance ratio of 0.3. This framework was applied to a UH-60A helicopter, focusing on optimizing the blade twist distribution and three airfoil segments in the outboard region. The resulting blade shape demonstrated a 9.6% power reduction in the forward flight and a 0.95% reduction in hover conditions. Furthermore, it shows favorable rotor power reduction at other advance ratios of forward flight. The significant power reduction in forward flight is primarily attributed to reduced drag on the advancing side near the blade tip and from the root to the mid-span region. Validation of the optimized rotor involved examining aerodynamic characteristics of the rotor blades.
감마선분광분석기와 액체섬광계수기를 이용한 226Ra 분석법 비교 연구
주병규,김문수,김현구,김동수,조성진,양재하,박선화,김형섭,권오상,김태승 한국분석과학회 2015 분석과학 Vol.28 No.3
The efficiency and applicability of the solid phase extraction disk method in a 226Ra analysis were examined by the gamma ray spectrometer (GRS) method using a Marinelli beaker and the liquid scintillation counter (LSC) method for groundwater. The recovered 226Ra, which was filtered by the solid phase extraction disk, was analyzed using gamma ray spectrometer The disks, which were pretreated for caulking the daughter nuclide, were sealed with polyethylene film. Distilled water was used for the blank value of the 226Ra activity. The recovery values of 214Bi and 214Pb in the solid phase extraction disk, which used 226Ra standard material, were 80% (295.21 Kev) and 104% (351.92 Kev), respectively, which were higher than 75% determined by the LSC. The injection of nitrogen gas into the measuring chamber reduced the interference values by about 10%. The detection limits of the 226Ra activity in a blank sample of 5 L were 0.17~0.40 pCi/L after 80,000 seconds of measuring time. The relationship of the 226Ra activity in the solid phase extraction disk method and in the LSC method in seven groundwater samples showed a correlation coefficient value 0.987, which implies the applicability of the solid phase extraction disk method. The results showed that 226Ra activity in groundwater using the solid phase extraction disk method has the following benefits: simple pretreatment, time saving, high recovery values, a low detection limit, and so on. Compared with the LSC method and the GRS method using the Marinelli beaker for the 226Ra analysis, the solid phase extraction disk method could be useful in groundwater samples with low levels of activities of radionuclides because the method is not restricted by the volume of the sample.