농업생산기반시설 통합안전성관리 의사결정구조지원 웹시스템 개발

이성용 ( Sungyong Lee ),이제명 ( Jemyung Lee ),김태곤 ( Taegon Kim ),은상규 ( Sangkyu Eun ),이정재 ( Jeongjae Lee ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-

저수지, 수로 등과 같은 농업생산기반시설의 안전은 지역주민들의 생명, 건강과 재산에 밀접한 영향을 끼치는 요소로서 삶의 질과 밀접한 연관을 지닌다. 이러한 농업생산기반시설의 안전은 다양한 위해 요인들로부터 영향을 받기 때문에 이들을 파악하고 객관적으로 평가하여 적절한 대응전략을 수립하는 것이 매우 중요하다. 그러나 지역의 시설을 관리해야 하는 주체는 한정된 재정, 시간, 인력 자원을 활용하여 지역 내의 여러 상이한 시설물을 다양한 재해에 대해 관리해야 한다는 어려움을 겪게 된다. 따라서 보수, 복구 등과 같은 사업의 우선순위와 효과를 객관적으로 파악하지 못한 상태에서 결정을 내리게 되는 문제점이 발생한다. 이러한 문제를 개선하기 위해 다양한 시설물의 다양한 재해요인과 그에 따른 예상피해규모를 산정하는 통합적 농업생산기반시설 안전성 관리가 필요하다. 따라서 본 연구에서는 통합안전성 관리 지표를 개발하고, 이를 이용해 다양한 재해요인에 대해 그 중요도를 분석하고, 다른 시설물간의 예상피해규모를 산정할 수 있도록 농업생산기반시설 통합 안전성 관리 웹 시스템을 개발하는 데에 목표를 두었다. 이 시스템을 통해 농업생산기반시설의 관리주체 및 이해당사자들은 사업의 편익분석의 도구로 활용할 수 있으며, 다양한 대안 분석을 할 수 있도록 하였다. 또한 시스템을 웹 기반으로 개발함으로써, 사업효용 분석 모델이 수정되거나, 추가적으로 기초자료가 구득될 경우, 서버에서 시스템을 수정하고 데이터베이스 관리를 하여 사용자는 추가적인 프로그램 업데이트나 자료구축 과정을 겪지 않는 이점이 존재할 것이다. 시범연구의 특성상, 농업생산기반시설 중 농업용저수지를 대상으로 하였으며, 재해는 수리/수문안전성, 지반/토질안전성, 구조적 안전성으로 한정 지었다. 대상지역은 EMP보고서가 구축된 지역 중, 위의 세가지 안전성 항목에 관한 자료를 구축하기 용이했던 25개 지역을 대상으로 하였다. 시스템은 python 언어를 기반으로 django 웹 프레임워크를 이용하여 개발하였으며, 데이터베이스는 SQLite를 사용하였다.

등가트러스모델을 이용한 구조최적화

이성용 ( Sungyong Lee ),김태곤 ( Taegon Kim ),이형진 ( Hyungjin Lee ),이정재 ( Jeongjae Lee ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-

본 연구에서는 등가트러스모델을 이용하여 구조최적화에 적용하는 방법에 대해 고찰하였다. 등가트러스 모델은 대상 구조물을 연속체로 가정하고 해석하는 기존의 방법과 달리, 구조물을 격자 트러스 요소로 구성된 이산체로 치환한 뒤, 트러스 구조해석을 통해 격자 단위로 응력 등의 결과를 얻는 방법이다. 등가트러스 모델은 이처럼 모델링 과정에서 구조물을 이산체로 변환하기 때문에, 구조최적화의 과정에서 상대적으로 덜 중요한 부분들을 제거해 나가는 과정에서 특별한 전처리 과정을 거치지 않고 곧바로 적용할 수 있는 특징이 있다. 본 연구에서는 등가트러스모델로 각각의 격자들의 응력을 구하여, 이를 von Mises응력으로 변환한 뒤, 상대적으로 다른 격자들에 비해 적은 응력을 받고 있는 격자들을 제거해나가는 것을 반복하는 방법으로 구조최적화를 수행한다. 이러한 방법으로 등가트러스모델을 이용하여 구조최적화를 수행하고, 기존의 연구결과와 비교할 것이다.

EURO-Ⅳ대응 상용디젤엔진의 SCR 시스템 적용에 따른 나노입자 배출 특성

이천환(Chunhwan Lee),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이종인(Jongin Lee),전성용(Sungyong Jeon),이춘범(Chunbeom Lee),이동인(Dongin Lee),김상호(Sangho Kim),한현식(Hyunsik Han),배재호(Jaeho Bae),김은석(Eunseok Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

It is well known that two representative methods satisfy the condition of EURO-Ⅳ regulation from EURO-Ⅲ. The first method is the reduction of NOx in an engine operation by utilizing EGR and the elimination of increased PM by DPF. However, it results in bad fuel efficiency. The second is the strategy to reduce PM and emit the high NOx concentration. In other words, the concentration of PM produced by high efficiency combustion sufficiently meets the requirement of regulation, and NOx generated in this process can be removed by SCR system. While it has a good fuel efficiency relative to the first method mentioned above, its social infrastructure is demanded. In this paper, the number distribution of nano PM has been evaluated analyzed by Electrical Low Pressure Impactor(ELPI) in two different case of engine condition, EURO-Ⅲ base engine with DPF system and EURO-Ⅳ level engine(modified from EURO-Ⅲ) with SCR system. From the result of this study, the number distribution of nano PM in a modified EURO-Ⅳ engine was similar level compared to the result of EURO-Ⅲ engine installed DPF system. In case of EURO-Ⅳ engine with SCR system, the particle number was increased slightly in proportion to the amount of urea injection on big size particles, whether AOC is used or not.

EURO-Ⅳ대응 상용디젤엔진의 SCR 시스템 적용에 따른 나노입자 배출 특성(Ⅱ)

이천환(Chunhwan Lee),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이종인(Jongin Lee),전성용(Sungyong Jeon),이춘범(Chunbeom Lee),이동인(Dongin Lee),김상호(Sangho Kim),한현식(Hyunsik Han),배재호(Jaeho Bae),김은석(Eunseok Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

It is well known that two representative methods satisfy the condition of EURO-Ⅳ regulation from EURO-Ⅲ. The first method is the reduction of NOx in an engine operation by utilizing EGR and the elimination of increased PM by DPF. However, it results in bad fuel efficiency. The second is the strategy to reduce PM and emit the high NOx concentration. In other words, the concentration of PM produced by high efficiency combustion sufficiently meets the requirement of regulation, and NOx generated in this process can be removed by SCR system. While it has a good fuel efficiency relative to the first method mentioned above, its social infrastructure is demanded. In this paper, the number distribution of nano PM has been evaluated analyzed by Electrical Low Pressure Impactor(ELPI) in case of Urea-SCR system applied. From the results, The particle number was increased slightly in proportion to the amount of urea injection on Fine Particle Region, whether AOC is used or not.

Application of multisection packing concept to sorption-enhanced steam methane reforming reaction for high-purity hydrogen production

Lee, Chan Hyun,Mun, Sungyong,Lee, Ki Bong Elsevier 2015 Journal of Power Sources Vol.281 No.-

<P><B>Abstract</B></P> <P>Hydrogen has been gaining popularity as a new clean energy carrier, and bulk hydrogen production is achieved through the steam methane reforming (SMR) reaction. Since hydrogen produced via the SMR reaction contains large amounts of impurities such as unreacted reactants and byproducts, additional purification steps are needed to produce high-purity hydrogen. By applying the sorption-enhanced reaction (SER), in which catalytic reaction and CO<SUB>2</SUB> byproduct removal are carried out simultaneously in a single reactor, high-purity hydrogen can be directly produced. Additionally, the thermodynamic limitation of conventional SMR reaction is circumvented, and the SMR reaction process becomes simplified. To improve the performance of the SER, a multisection packing concept was recently proposed. In this study, the multisection packing concept is experimentally demonstrated by applying it to a sorption-enhanced SMR (SE-SMR) reaction. The experimental results show that the SE-SMR reaction is significantly influenced by the reaction temperature, owing to the conflicting dependence of the reaction rate and the CO<SUB>2</SUB> sorption uptake on the reaction temperature. Additionally, it is confirmed that more high-purity hydrogen (<10 ppm of CO) can be produced by applying the multisection packing concept to the SE-SMR reactions operated at sufficiently high temperatures where the SMR reaction is not limited by rate.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SE-SMR reaction was performed using catalyst–sorbent mixture at various temperatures. </LI> <LI> The SE-SMR reaction performance is highly dependent on the reaction temperature. </LI> <LI> The multisection packing concept was successfully applied to the SE-SMR reaction. </LI> <LI> More high-purity H<SUB>2</SUB> is produced with multisection packing. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

The first attempt at continuous-mode separation of <i>racemic</i> and <i>meso</i>-2,3-butanediol with high purities using a simulated-moving-bed process

Lee, Chung-Gi,Song, Ye Jin,Lee, Ki Bong,Mun, Sungyong Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-

<P><B>Abstract</B></P> <P>To maximize the industrial value of biologically produced 2,3-butanediol (BD), it is essential to separate BD into its stereoisomeric fractions, <I>meso</I>-BD and <I>racemic</I>-BD. To address such issue, a highly efficient BD-isomer separation process based on a simulated-moving-bed (SMB) mode was developed in this study. As a first step for this task, the competitive adsorption behaviors of <I>meso</I>-BD and <I>racemic</I>-BD on a properly selected adsorbent were investigated, and their relevant isotherm parameters were determined using inverse method. The determined isotherm parameters were then applied to the design of the BD-isomer separation process based on an SMB mode, which was carried out in such a way that both BD isomers could be separated with high purities and little losses in a continuous countercurrent mode. The performance of the designed SMB process for the targeted separation was experimentally investigated. It was confirmed from the experimental results that the BD-isomer separation SMB process, which was developed in this study for the first time, could be effective in the continuous-mode separation of <I>meso</I>-BD and <I>racemic</I>-BD with the purities higher than 99.9% and 97% respectively while maintaining their losses below 1%. The results of this study are expected to pave the way for establishing a highly economical process for a large-scale production of <I>meso</I>-BD and <I>racemic</I>-BD with high purities.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The SMB for continuous-mode separation of 2,3-butanediol (BD) isomers was developed. </LI> <LI> Highly effective adsorbent for separation of <I>meso</I>-BD and <I>racemic</I>-BD was found. </LI> <LI> Competitive Langmuir isotherm parameters of BD isomers were determined and validated. </LI> <LI> The resultant isotherm parameters were used to design the BD-isomer separation SMB. </LI> <LI> The designed SMB led to high purities of <I>meso</I>-BD and <I>racemic</I>-BD with little losses. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Sparse-view proton computed tomography using modulated proton beams : Sparse-view proton CT

Lee, Jiseoc,Kim, Changhwan,Min, Byungjun,Kwak, Jungwon,Park, Seyjoon,Lee, Se Byeong,Park, Sungyong,Cho, Seungryong Published for the American Association of Physicis 2015 Medical physics Vol.42 No.2

<P>Proton imaging that uses a modulated proton beam and an intensity detector allows a relatively fast image acquisition compared to the imaging approach based on a trajectory tracking detector. In addition, it requires a relatively simple implementation in a conventional proton therapy equipment. The model of geometric straight ray assumed in conventional computed tomography (CT) image reconstruction is however challenged by multiple-Coulomb scattering and energy straggling in the proton imaging. Radiation dose to the patient is another important issue that has to be taken care of for practical applications. In this work, the authors have investigated iterative image reconstructions after a deconvolution of the sparsely view-sampled data to address these issues in proton CT.</P>

IL-6 receptor 관 defines effector memory CD8+ T cells producing Th2 cytokines and expanding in asthma.

Lee, Naeun,You, Sungyong,Shin, Min Sun,Lee, Won-Woo,Kang, Ki Soo,Kim, Sang Hyun,Kim, Wan-Uk,Homer, Robert J,Kang, Min-Jong,Montgomery, Ruth R,Dela Cruz, Charles S,Shaw, Albert C,Lee, Patty J,Chupp, Ge American Lung Association 2014 American journal of respiratory and critical care Vol.190 No.12

<P>Cytokine receptors can be markers defining different T-cell subsets and considered as therapeutic targets. The association of IL-6 and IL-6 receptor 관 (IL-6R관) with asthma was reported, suggesting their involvement in asthma.</P>

Medium-band Observation of Neutrino Emitting Blazar, TXS 0506+056

Sungyong Hwang,Myungshin Im,Yoon Chan Taak,Insu Paek,Changsu Choi,Suhyun Shin,Sang-Yun Lee,Tae-Geun Ji,Soojong Pak,Hye-In Lee,Hojae Ahn,Jimin Han,Changgon Kim,Jennifer Marshall,Christopher M.Johns-Kru 한국천문학회 2022 天文學會報 Vol.47 No.1

소나무림과 잣나무림의 산불 잠재위험성 비교

Sungyong Kim,Sukhee Yoon,Youseung Kim,Byungdoo Lee,Youngjin Lee,Mina Jang 위기관리 이론과 실천 2015 Crisisonomy Vol.11 No.11

본 연구에서는 우리나라를 대표하는 침엽수종 소나무림과 잣나무림을 대상으로 지표층 연료의 특성을 파악하고, 수관화 전이 잠재 위험성을 비교하고자 하였다. 이를 위해 소나무 임분과 잣나무 임분에서 지표층연료를 144 sample, 53 sample을 채취하여 분석에 이용하였으며, 국외에서 제시된 바 있는 물리적 산불수학식을 적용하여 수관화 전이 잠재위험성을 분석하였다. 본 연구 결과에 의하면, 잣나무림은 타감작용의 여파로 관목층과 초본층 연료량이 소나무림에 비해 적은 것으로 나타났으나, 낙엽,낙지층 연료량은 소나무림에 비해 많은 것으로 분석되었다. 수관화 전이 잠재위험성 분석에서는 수관화 전이 결정 강도, 수관화 전이 결정 화염길이, 수관화 전이 결정 확산속도 모두 잣나무림이 높은 결과치를 나타내었는데, 이는 잣나무림이 소나무림에 비해 수관화 전이 위험성이 낮음을 의미한다. 이러한 원인은 잣나무림이 소나무림에 비해 지표층 연료에 함유되어 있는 수분의 양이 많고, 임분의 평균지하고가 높기 때문으로 사료된다. This study aims to analyze the characteristics of surface fuel load and estimate potential crown fire transition hazards in Pinus densiflora and Pinus koraiensis stands. Surface fuels were collected from 144 samples in Pinus densiflora stands and 53 samples in Pinus koraiensis stands. A forest fire spread equation presented in foreign countries was applied to analyze the potential crown fire transition hazard in Korea. The results of the data analysis showed that the shrub fuel layer and herb fuel layer of the load in Pinus densiflora stand was less than those in Pinus koraiensis stand due to allelopathy. It is also found that dead leaves and snags fuel was higher in Pinus densiflora stand than Pinus koraiensis stand, which indicates that Pinus koraiensis stand has relatively less risk of crown fire hazard than Pinus densiflora stand