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혼합물분석을 통해 최적화된 TiO<sub>2</sub>/HAP/Ge 촉매를 이용한 Lincomycin 제거특성 연구
김동우,장순웅,Kim, Dongwoo,Chang, Soonwoong 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.1
본 연구에서는 UV-A 조사를 통해 titanium dioxide($TiO_2$), hydroxyapatite(HAP)와 germanium(Ge)의 다양한 복합촉매를 통한 항생제(lincomycin, LM)의 광촉매 제거를 조사하였다. 우선, 다양한 복합촉매의 향상된 광촉매능을 비교하였고, 도출된 제거효율은 $TiO_2/HAP/Ge$ > $TiO_2/Ge$ > $TiO_2/HAP$ 순으로 관찰되었다. $TiO_2/HAP/Ge$의 조성은 반응표면법의 하나인 혼합물분석(mixture analysis)에 기초하여 통계적 방안이 수행되었다. 각 인자별 6개의 조건을 포함하도록 설정한 독립변수 $TiO_2(X_1)$, HAP($X_2$)와 Ge($X_3$)의 LM($Y_1$)과 TOC($Y_2$) 제거에 대한 영향을 살펴보았다. 분산분석(ANOVA)의 회귀분석항은 유의한 p값(p<0.05)과 높은 결정계수 값($R^2$ of $Y_1=99.28%$ and $R^2$ of $Y_2=98.91%$)을 나타냈다. 등고선도와 반응곡선을 통해 UV-A 조사조건에서 $TiO_2$/HAP/Ge 조성에 따른 LM의 제거를 나타냈다. TOC($Y_2$) 제거를 기준으로 도출된 최적조성비는 코드화 값으로 $X_1=0.6913$, $X_2=0.2313$과 $X_3=0.0756$으로 나타났다. 실제 적용에 따른 비교 실험 결과는 LM과 TOC의 평균제거율이 각각 99.2%와 49.3%로 나타나 모델의 예측과 잘 부합하였다. In this study, it was found that determined the photocatalytic degradation of antibiotics (lincomycin, LM) with various catalyst composite of titanium dioxide ($TiO_2$), hydroxyapatite (HAP) and germanium (Ge) under UV-A irradiation. At first, various type of complex catalysts were investigated to compare the enhanced photocatalytic potential. It was observed that in order to obtain the removal efficiencies were $TiO_2/HAP/Ge$ > $TiO_2/Ge$ > $TiO_2/HAP$. The composition of $TiO_2/HAP/Ge$ using a statistical approach based on mixture analysis design, one of response surface method was investigated. The independent variables of $TiO_2$ ($X_1$), HAP ($X_2$) and Ge ($X_3$) which consisted of 6 condition in each variables was set up to determine the effects on LM ($Y_1$) and TOC ($Y_2$) degradation. Regression analysis on analysis of variance (ANOVA) showed significant p-value (p < 0.05) and high coefficients for determination value ($R^2$ of $Y_1=99.28%$ and $R^2$ of $Y_2=98.91%$). Contour plot and response curve showed that the effects of $TiO_2/HAP/Ge$ composition for LM degradation under UV-A irradiation. And the estimated optimal composition for TOC removal ($Y_2$) were $X_1=0.6913$, $X_2=0.2313$ and $X_3=0.0756$ by coded value. By comparison with actual applications, the experimental results were found to be in good agreement with the model's predictions, with mean results for LM and TOC removal of 99.2% and 49.3%, respectively.
AHP를 활용한 중소도시 생활SOC 주요지표의 중요도 평가
김동우,한다혁,이민석,Kim, Dongwoo,Han, Da-hyuck,Lee, Min-seok 한국농촌건축학회 2020 농촌건축 : 한국농촌건축학회논문집 Vol.22 No.4
This study evaluated the importance between the major indicators of living SOC in small and medium cities. AHP layer analysis was performed on a group of experts and their importance and priorities were evaluated. The results of the assessment are as follows: First, the village(walking) living zone was considered relatively more important than the local hub(vehicle) living zone. Second, the importance of health care in the local hub(vehicle) living area was assessed to be the most important in the comprehensive evaluation. Third, medical care, care, education and convenience in the village(walking) living area were ranked second, third, fourth and fifth, respectively. Fourth, the relative importance of physical education, learning, physical education, learning, relaxation, culture and village(walking) living areas in the local hub(vehicle) living areas were valued low. It is necessary to seek living SOC policies and directions in consideration of the special nature of urban social structure in small and medium-sized cities in Korea.
김동우,전재용,Kim, Dongwoo,Chun, Jae-Yong Korean Society of Applied Entomology 2014 한국응용곤충학회지 Vol.53 No.1
최근 5년 동안 식물검역 현장에서 검출된 뿌리썩이선충속 선충을 분류하여 Pratylenchus crenatus, P. fallax, P. kumamotoensis, P. panamaensis, P. penetrans로 동정하였다. 이 종들의 진단형질은 구순부의 주름 수, 두부의 형태, 구침의 길이, 수컷의 유무, 측대의 구조, 수정낭의 형태, 후부자궁낭의 길이, 미부의 형태 등을 포함한다. 이들의 사진과 측정치 및 형태적 특징을 기술하였다. We identified the five root-lesion nematode species, Pratylenchus crenatus, P. fallax, P. kumamotoensis, P. panamaensis and P. penetrans from intercepted in quarantine inspection over the past five years. Their diagnostic characters are including number of lip annuli, stylet length, shape of the labial region, presence or absence of males, structure of lateral fields, shape of spermatheca, length of the post-vulval uterine sac and shape of tail and so forth. We described the photos, measurements and morphological characters.
밭 노지 작업을 위한 모듈형 농업 로봇 플랫폼 개선에 관한 연구
김동우(Dongwoo Kim),홍형길(Hyunggil Hong),조용준(Yongjun Cho),윤해룡(Haeyong Yun),오장석(Jangseok Oh),강민수(Minsu Gang),박희창(Huichang Park),서갑호(Kabho Seo) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.10
Our study introduces an improved modular agricultural platform to provide convenience to agricultural workers. We upgrade the platform design in three parts, namely, by adding a 458 pattern tire, electricity control, and four-wheel steering function, to improve the platform performance. Results showed that the upgrades enhanced the platform performance and reduced its overall weight as compared with the existing platform. To demonstrate the performance of our improved platform, we conducted five types of experiments with respect to the climbing angle, variable width, attitude control, speed, and obstacle passing.
CMP Pad 표면 변화를 통한 초기 Polishing 특성 향상
김동우(Dongwoo Kim),Kathleen McHugh,안봉수(Bongsoo Ahn),김태성(Taesung Kim) 한국트라이볼로지학회 2010 한국트라이볼로지학회 학술대회 Vol.2010 No.6
In this work, we know that the Roughness on a CMP pad can present the status of a CMP Pad. If we manage a roughness of CMP pad, we can get a good CMP performance at an initial Pad life time. As a result of this work, we can get new generation Pad, called a Pre-Conditioned Pad. Based on experimental results, it is revealed that it can reduce a back up time of a CMP tool after changing its consumables. Because, it can improve the removal rate & defectivity at an initial pad life time.
표준강수지수와 정규식생지수를 활용한 봄 가뭄 탐지 가능성 분석
김동우 ( Dongwoo Kim ),박종철 ( Jongchul Park ),장동호 ( Dong-ho Jang ) 한국지리학회 2017 한국지리학회지 Vol.6 No.2
가뭄을 모니터링하고 예측하는 방법으로는 가뭄지수와 위성영상의 식생지수가 활용되고 있다. 본 연구는 정규격자 강수량자료와 MODIS(Moderate Resolution Imaging Spectroradiometer) 영상자료를 활용하여 표준강수지수와 정규식생지수의 상관관계를 분석을 통해 봄 가뭄 탐지 가능성을 분석하였다. 연구지역은 남한 전체이며 3월과 5월에 식생이 민감하게 반응하는 가뭄유형을 지역별로 제시하였다. 연구 결과, 두 지수의 상관관계는 시기별, 지역별로 연관성이 다르게 나타났다. 3월 한라산과 지리산산간지대의 식생은 모든 가뭄 유형에 민감하였고, 5월 호남지방의 농경지는 단기가뭄, 중부지방의 산지지역은 중기가뭄에 민감한 것으로 분석되었다. 이를 통해 두 지수의 상관관계 분석은 봄 가뭄에 민감한 지역을 파악하는데 유용한 것으로 판단되었다. 본 연구의 결과는 향후 NDVI와 SPI의 상관관계를 분석하여 봄 가뭄을 예측하는 연구에 활용될 것으로 기대된다. As a method of monitoring and predicting droughts, the drought index and the normalized difference vegetation index (NDVI) of satellite images are being used. This study analyzed the possibility of detecting droughts through an analysis of the correlation between the standard precipitation index (SPI) and the NDVI using the regular spaced grid precipitation data and MODIS images data. The study was conducted on the entire region of South Korea and the types of droughts where vegetation sensitively responds during March and May were proposed in each region. As a result of study, it was displayed different correlations of the two indexes by season and region. The vegetation in the mountainous regions of Mt. Halla and Mt. Jiri was sensitive to all types of droughts in March, and the farming region of Honam was sensitive to short-term droughts and the mountainous regions of the central region were sensitive to mid-term droughts. Through which, it was indicated that the analysis of the correlation of the two indexes is useful in ascertaining the regions sensitive to spring droughts. The result of this study is expected for use in studies that predict spring droughts by analyzing the future correlation of NDVI and SPI.
효과적인 멀티태스크 프로그램 검증을 위한 KLEE와 CBMC의 오경보 식별 성능 비교
김동우(Dongwoo Kim),최윤자(Yunja Choi) Korean Institute of Information Scientists and Eng 2021 정보과학회논문지 Vol.48 No.2
OiL-CEGAR[1] verifies the composition of a formal OS model and an abstracted application program for accurate verification. Due to the use of the abstract program, however false-alarms can be reported and executability checking for identifying false-alarms requires a high cost. Therefore, efficient executability checking is essential to improve verification performance. To find an effective executability checking method, this study introduces and compares two different techniques that perform executability checking. The first one collects the Boolean formula for the entire program and checks the reachability of all the program blocks in the counterexample by using CBMC. While the second one uses KLEE and identifies non-executable blocks in the counterexample through the binary search-based executability checking. The suggested executability checking methods are applied to a window controller program from the automotive domain. Results show that executability checking using KLEE takes only 1/2000 time compared to that of CBMC and reduces 11.78% of OiL-CEGAR verification costs.