http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Agent의 효율적이고 안전한 Exploration을 위한 Tsallis Entropy의 분포 기반 강화학습에의 적용
정재연(Jaeyeon Jeong),오성회(Songhwai Oh) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 통합된 maximum entropy regularization RL 프레임워크인 Distributional Tsallis Actor Critic (DTAC)를 제안한다. DTAC는 value function의 분포와 Tsallis Entropy maximization을 통해 value와 action의 다양성을 보장하고 현재의 value function을 정확하게 예측할 수 있도록 한다. DTAC에 CVaR 등의 risk sensitive network을 적용했을 경우 exploration을 더 안전하게, 혹은 더 적극적으로 할 수 있도록 조정이 가능하다. MuJoCo environment에서 Hopper-v2, HalfCheetah-v2, Humanoid-v2 등의 agent들에 실험하여 다양한 entropic index에 따른 학습된 behavior의 차이를 확인하였다.
Wolbachia Infection Frequency in Some Korean ant Species
Gilsang Jeong,Eunha Ko,Jaeyeon Kang,Jae Chun Choe 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.10
The Wolbachia bacterium is one of the best studied reproductive manipulators found in variuos invertebrate taxa. Theoretically it infects two thirds of invertebrates. It is thought to have a huge impact on its hosts’ evolution. The ant is a very successful organism in terrestrial ecosystems especially with its charicteristic sociality. However, the influence of Wolbachia on the animal remains to be paid more attention. This study is to examine Wolbachia infection frequency in some ant species in Korea. The result shows that 9 out of 12 ant species harbor the bacterium. Furthermore, at least two species show polymorphism in their infection status at the colony level. This will be used as a foundation of further study on the interactions between the bacterium and ant species.
응급환자 추이예측 분석 : AMI, Stroke, ICISS 기반 중증질환자
정재연 ( Jeong Jaeyeon ),정지윤 ( Jeong Jiyun ),이해종 ( Lee Haejong ) 경희대학교 경영연구원 2021 의료경영학연구 Vol.15 No.1
Purpose: The purpose of this study is to identify the trends and seasonality of the three major emergency diseases(Acute myocardiac infarction, Stroke, Severe trauma) and to use them to establish efficient resources and evidence-based physicians to predict the number of patients. Methodology: From 2014 to 2018, the number of patients who received emergency medical care for acute myocardial infarction, stroke, and severe trauma (based on ICISS 2008) was predicted using Emergency Medical Status Statistics provided by the National Medical Center. Based on the Autoregressive integrated moving average model, the increasing trend and seasonality of patients by disease were confirmed and the number of patients was predicted. Findings: Since 2014, the number of patients with emergency diseases has steadily increased, with the highest number of patients in the order of Severe trauma (based on ICISS 2008), Stroke, and Acute myocardiac infarction. Patients with cerebrovascular disease, such as Acute myocardiac infarction and stroke, increased rapidly in winter(Oct-Jan), and patients with severe trauma increased mainly in summer or autumn(May-Oct) and number of patients will increase with seasonality. Practical Implications: The number of major emergency patients is expected to increase steadily over time, so it is important to be prepared for this. Therefore, providing emergency care with limited resources is a very important issue, and in order to prepare for the growing elderly population, emergency medical patients, and unpredictable infectious diseases, it is necessary to keep track of the number of patients for each emergency disease.
Biomorphic C/SiC 복합재료의 기계적 물성 연구
정재연(Jaeyeon Jeong),우경식(Kyeongsik Woo),이동주(Dongju Lee),홍순형(Soonhyung Hong),김연철(Yunchul Kim) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.8
본 논문에서는 Biomorphic C/SiC 복합재료에 대하여 단위구조해석을 수행하였다. 소나무와 뉴송을 탄화하고 실리콘을 함침해 제조한 복합재료의 미세조직을 사각배열과 육각배열로 가정해 단위구조를 정의하고 등가물성치를 계산하였다. 단위구조의 크기가 동일하지 않은 경우도 고려하였고, 또한 공극의 배열에 따른 물성치의 변화를 몬테카를로 시뮬레이션을 통해 조사하였다. In this paper, mechanical property of biomorphic C/SiC composite was calculated by unit cell analysis. The microstructural arrangements of carbonized pine and radiata pine which were impregnated with silicon, were idealized as square and hexagonal arrays. Unit cell was then defined and equivalent elastic constants were calculated. A single and double unit cell structures were considered. The effect of void distribution was also studied by monte carlo simulation.
정재연(Jaeyeon Jeong),우경식(Kyeongsik Woo) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.11
본 논문에서는 재료의 물성에 따른 파괴 거동을 응집영역모델과 확장유한요소법을 이용하여 예측하였다. 중앙에 경사진 초기 균열을 가지는 직사각형 시편 형상에 대해 평면응력요소로 모델링하고 인장하중을 가하여 균열의 전파 거동을 모사하였다. 파손 진전이 예측되는 지역에 대해 응집영역모델링 해석에서는 모든 일반 요소들 사이에 응집요소를 삽입하였고, 확장유한요소해석에서는 요소확장영역으로 지정하였다. 취성과 소성 재료에 대해 파괴 형태를 예측하고 파괴 강도를 계산하였다. 시편의 두께가 매우 얇은 경우에 기하학적 비선형 후좌굴해석 기법으로 주름변형을 고려하였고 주름이 파괴 거동에 미치는 영향을 조사하였다. In this paper, the effect of material properties on fracture behavior was studied using cohesive zone model and extended finite element method. The rectangular tensile specimen with a central inclined initial crack was modeled by plane stress elements. In the CZM modeling, cohesive elements were inserted between every bulk elements in the predicted crack propagation region before analysis, while in the XFEM the enrichment to the elements was added as needed during analysis. The crack propagation behavior was examined for brittle and ductile materials. For thin specimen configuration, wrinkle deformation was accounted for by geometrically nonlinear post-buckling analysis and the effect of wrinkling on the crack propagation was investigated.
Simplified Analysis of Three Dimensional Mega Foundations for High-Rise Buildings
Jeong, Sangseom,Lee, Jaehwan,Cho, Jaeyeon Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.4
In this study, an approximate computer-based method was developed to analyze the behavior of raft and piled raft foundations. Special attention is given to the improved analytical method proposed by considering raft flexibility and soil nonlinearity. The overall objective of this study is to focus on the application of a simplified analysis method for predicting the behavior of sub-structures. Through the comparative studies, it is found that the computer programs (YS-MAT and YSPR), developed in this study, is in agreement with the general trends observed by field measurements. Therefore, YS-MAT (Yonsei-Mat) and YSPR (Yonsei Piled Raft) can be effectively used for the preliminary design of a raft or a piled raft foundation for high-rise buildings.