A Search for the Initiative Role in APEC with Political and Economic Cooperation between Korea and Australia_OVERVIEW

Chungwon Choue(Chungwon Choue) 경희대학교 국제지역연구원 1995 아태연구 Vol.2 No.1

Bigdata based Fault and Optimal Replacement Cycle Prediction System for Power Infrastructure

Chungwon Lim(임청원) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7

The Research of Job-stress and Perceived Value of Work by Participation in improvement of working environment

ChungWon Lee,JinHo Kim 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.11

Objective: The aim of this study is to investigate the participation in improvement of working environment influencing job-stress and perceived value of work. Background: Job-stress and perceived value of work are very important of research areas. In particular they perform work is has more of an effect on stress and perceived value of work. Moreover, the workers involved in the operation is to improve affects job stress and perceived value of work. Method: We used to The Forth Korean Working Conditions Survey(2014), Occupational Safety and Health Research Institute. We were mainly used ANOVA. Conclusion: Job-stress is the highest at the Quality Standard task and Work to improve participation conditions. And perceived value of work is the highest at the Quality Standard task and Work to improve participation conditions. However, there was no statistically significant difference between Quality Standard task. Application: We understand that participation in job characteristics and job improvements can have a psychological impact on workers and, if so created could lead to a positive impact, we believe can expect a higher workplace.

Genetically Encoded Biosensors for the GR-effector Screening

Chungwon KANG,Youngeun KWON 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

Cortisol plays an essential role in mediating stress and anti-inflammatory response. It is important to screen cortisol and its analogues to monitor stress levels and identify drug candidates. Novel cell-based biosensors have arisen as a promising platform for detecting targets. We used a glucocorticoid receptor (GR) fused split-intein and a counterpart split-intein pair, separated by a cellular compartment to fabricate sensor cells. Cortisol triggered conditional protein splicing (CPS) translocates fluorescence cargo to cytosol from the nucleus. The sensor cells showed exceptional performance with fast detection and discriminating functional analogues from the structural analogues of cortisol. The sensor cells can detect unknown GR-effectors in essential oils. Peppermint oil was revealed to contain GR-effector, and L-limonene was identified. Further analysis indicated L-limonene as a selective GR agonist, a potent anti-inflammatory agent that attenuates inflammatory response without causing notable adverse effects. The cell-based biosensor provides a valuable platform for GR-effector screening. It also suggests detecting targets in the native context, which holds large potential in drug discovery.

강우재현 원심모형실험에 적용하기 위한 수평변위 계측장치의 개발

이충원(Chungwon Lee),박성용(Sungyong Park),김용성(Yongseong Kim) 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.12

집중호우는 사면의 붕괴와 사회 기반시설물의 파괴 등을 포함하는 다수의 재해를 유발한다. 이러한 관점에서 강우재현 원심모형실험은 지반구조물의 안정성을 평가하기 위한 합리적인 수단이 될 수 있다. 원심모형실험에서 모형의 변위를 취득하기 위하여 일반적으로 LVDT 또는 레이저 변위계가 사용된다. 그러나 강우 모사 시 LVDT는 모형지반으로의 과다 침윤의 문제가 있으며, 레이저 변위계는 레이저의 산란에 의해 계측치의 정확성이 저하된다. 따라서 본 연구에서는 강우재현 원심모형실험에 적용하기 위한 수평변위 계측장치를 개발하였다. 본 연구를 통하여 탄성의 박철판과 스트레인 게이지를 이용하여 제작된 본 장치는 관입을 위한 말단부를 고정시켜 수행한 검정 결과로부터 정확한 변위-변형률 관계를 나타냄을 확인하였다. Heavy rainfall induces many disasters including slope failure and infrastructure collapse. In this point of view, rainfall-simulated centrifugal model test can be a reasonable tool to evaluate the stability of geotechnical structure. In order to obtain the displacements of a model in centrifugal model test, in general, LVDT and laser displacement sensor are used. However, when the rainfall is simulated, the LVDT has the problem of excessive infiltration into the model ground, and the laser displacement sensor provides the measuring result with inaccuracy due to the dispersion of the laser radiation. Hence, in this study, horizontal displacement sensor for rainfall-simulated centrifugal model test was developed. This sensor produced with a thin elastic steel plate and gave the accurate relationship between the displacement and the strain.

요소 시뮬레이션에 의한 불포화토의 반복삼축거동 재현

이충원(Chungwon Lee) 한국지반환경공학회 2015 한국지반환경공학회논문집 Vol.16 No.10

불포화토에는 부(-)의 압력인 석션(Suction)이 작용한다. 석션은 입자간 응력을 증가시키며, 이에 따라 토립자 골격의 항복응력 및 소성전단강성을 증대시킨다. 따라서 본 연구에서는 이러한 석션의 효과를 지진 등의 동적 하중조건에서 고려하기 위해 불포화토에 대하여 확장된 반복탄소성구성식으로부터 제1 항복함수 및 제2 항복함수를 고려하여 유도된 응력-변형률 관계를 이용하여 반복삼축시험의 요소 시뮬레이션을 수행하였다. 그 결과 응력경로, 응력-변형률 관계 및 체적변형률-축변형률 관계로부터 요소 시뮬레이션은 반복삼축거동을 양호하게 모사함을 확인하였다. 본 연구결과는 동적 하중이 작용하는 불포화토 거동 예측의 정확도 제고에 기여할 것으로 전망된다. Suction affects the unsaturated soil as the negative pore pressure, and leads to increases of the yield stress and the plastic shear stiffness of the soil skeleton due to the growth in interparticle stress. Hence, in this study, in order to account for these effects of suction under the dynamic loading condition such as the earthquake, the element simulation of the cyclic triaxial test using induced stress-strain relation based on cyclic elasto-plastic constitutive model extended for unsaturated soil considering the 1<SUP>st</SUP> and the 2<SUP>nd</SUP> yield functions was conducted. Through the stress path, stress-strain relation and relation between volumetric strain and axial strain, it was seen in all the cases that the simulation results demonstrated a good agreement with the experimental results. It is expected that the results of this study possibly contribute to the accuracy improvement on the prediction of unsaturated soil behavior under the dynamic loading condition.

시공 중 및 담수 후 계측데이터를 이용한 CFRD의 침하량 예측 연구

이충원(Chungwon Lee),김용성(Yongseong Kim) 한국지반환경공학회 2015 한국지반환경공학회논문집 Vol.16 No.2

본 연구에서는 36개의 CFRD에 대한 계측자료(38개 지점)를 통해 댐 축조단계에서 얻어지는 계측자료를 이용하여 담수 후 댐의 정부침하량 및 내부침하량 예측기법을 제안하였다. 전체 데이터에 대한 분석 결과, 댐체의 정부침하량 및 시공 중 최대 내부침하량은 댐체의 높이 및 간극비에 비례하였다. 그러나 내부침하량과 댐 높이에 대한 반대수지 상에서의 선형회귀분석 결과는 간극비에 따른 차이 없이 대단히 유사함을 확인하였다. 또한 CFRD의 시공 중 내부침하량을 통해 정부침하량의 예측이 가능하였으며, 댐체가 조밀할 경우 연직변형계수가 크게 평가됨과 동시에 계곡형상의 영향을 많이 받는 것으로 나타났다. 본 연구결과는 향후 CFRD의 설계, 시공, 장기적 유지관리를 위한 유용한 도구가 될 것으로 사료된다. In the present study, the prediction methods of the crest settlement after impounding and the maximum internal settlement during dam construction were proposed through the analysis on settlement data at 38 monitored points of 36 Concrete-Faced Rockfill Dams (CFRDs). The results from this analysis provided that the crest settlement and the maximum internal settlement are increased in proportion to the dam height and the void ratio. However, the relationship between internal settlement and dam height for each void-ratio range plotted in semi-logarithmic scale is the nearly same. Also, the prediction of the crest settlement of the CFRD is possible through the maximum internal settlement during dam construction. In addition, it seems that the valley shape highly affects the dense dam body with high construction modulus. The results of this study will provide the useful tool for the design, construction and management of CFRDs.

빅데이터 기반 고장예측시스템 구축을 위한 배전설비 고장분석에 관한 연구

임청원(Chungwon Lim),이현우(Hyunwoo Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.2

Collective dynamics of Fermi surface fluctuations in an interacting Weyl metal phase

Jeong, Chungwon,Kim, Ki-Seok American Physical Society 2018 Physical Review B Vol.98 No.16

계측자료를 이용한 중심코어형 석괴댐의 장기침하량 예측

이충원(Chungwon Lee),김용성(Yongseong Kim) 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.11

본 연구에서는 37개의 CCRD에 대한 계측자료(46개 지점)를 통해 댐 축조단계에서 얻어지는 계측자료를 이용하여 담수후 댐의 정부침하량 및 내부침하량 예측기법을 제안하였다. 전체 데이터에 대한 분석 결과, 담수 후 시간경과에 따라 정부침하량이 함께 증가함이 확인되었으며, 댐 코어의 재료를 조립질과 세립질의 2가지 유형으로 구분한 댐 높이와 시공 중 최대 내부침하량의 관계로부터 조립질 재료를 사용 시의 내부침하량이 다소 크게 평가되었다. 또한 내부침하량은 댐 높이에 비례하여 증가하였으며, 댐 코어로서 세립질 재료를 사용하는 경우의 정부침하량이 상대적으로 크게 평가되었다. 본 연구결과는 향후 CCRD의 설계, 시공, 장기적 유지관리를 위한 유용한 도구가 될 것으로 전망된다. In this study, the prediction methods for the crest settlement after impounding and the maximum internal settlement during dam construction were proposed through the analysis on settlement data at 46 monitored points of 37 Center-Cored Rockfill Dams (CCRDs). Results from this analysis provided that the crest settlement increases with elapsed time, and from the relationship between the dam height and the maximum internal settlement during dam construction, it is confirmed that the internal settlement was largely evaluated when the coarse-grained material was used as the dam core. This internal settlement increased in proportion to the dam height. In addition, the crest settlement of the CCRD with the core compacted with fine-grained material was relatively large. It is expected that the results of this study would provide the practical tool for the design, construction and management of CCRDs.