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Chanho Sung(성찬호),Jungho Kim(김정호),kyungmin Kim(김경민) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: This study is to investigate and observe what essential procedures are for operators in the main control room (MCR) of APR1400 Power plant to share performance information when performing the procedures. In APR1400, the procedures that need to be shared for the performance information between operators are determined in advance when they are prepared. Background: It is important to share procedure execution information between operators to reduce human errors in MCR. CPS (Computerized Procedure System) makes it possible in APR1400, but all the procedures are not designated to be shared. Therefore this study is to find out what procedures need to be essentially shared between operators with CPS in APR1400 MCR. Method: There was the ISV (Integrated System Validation) for SKN unit 5 in the Shinkori units 5&6 simulator in Busan for the 3 weeks from August to September in 2021. During the ISV, 12 scenarios were performed for validation of MCR HFE and the scenarios consisted of dozens of operating procedures. And the operators, who were the subjects, performed the scenarios. Whenever each scenario finished, we found out the operating procedures that need to be shared through expert observation, surveys and interviews with operators. Results: According to the result of the observation, the surveys and interviews, the operating procedures that need to be shared essentially included all AOPs (Abnormal Operating Procedures) as well as all EOPs (Emergency Operating Procedures). Conclusion: For reducing human errors and enhancing operator’s performance in MCR, all the EOPs and AOPs in APR1400 MCR need to be shared between the operators with CPS. Application: The results of this study will be applied to operating procedures for SKN units 5&6.
Analysis of Utilization of the Methods for Human-Errors Prevention in Nuclear Power Plants
Sung Chanho,Yoon Jonghyun,Park Jeongjin 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10
Objective: The aim of this analysis is to investigate the utilization of the methods for preventing human-errors in nuclear power plants in Korea. Background: Human error is one of main contributors of reactor trip in nuclear power plants. As an effort of preventing human-errors, ‘Human-error prevention techniques’ has been applied in nuclear power plants. Thus, it is important for plants’ safety to analyze the utilization of the techniques and find out the root causes of human-errors. Method: The utilization was investigated by means of a questionnaire survey to 1,740 employees in nuclear plants. The main analysis parts are as in the following; (1) the understanding and utilization level of the techniques (2) difficulties of applying the techniques (3) training level and effect of the techniques (4) the root causes of human-errors Results: Employee’s understanding, utilization and training level for the prevention techniques were very high. The root causes of human-errors were insufficient working time and man-power shortage, excessive mission, and lack of employee’s job knowledge. Conclusion: To prevent human-errors in nuclear power plants, working environment as well as employee’s training is important factor. Application: The results of the analysis might help to determine the policy of KHNP for reducing human-errors.
Sensitivity study for important parameters of VIV fatigue evaluation of SCR
Lee, Sung-Je,Kang, Chanhoe,Jang, Changhwan,Park, Sung-Gun Korean Society of Ocean Engineers 2017 Journal of advanced research in ocean engineering Vol.3 No.2
Since risers have to be operated without being replaced during the design life time after installation, fatigue evaluation as well as strength analysis should be performed. The fatigue life of the riser is known to be dominantly influenced by wave loading and vortex induced vibration (VIV) phenomena. The fatigue life evaluation method and the behavior characteristics of the riser by the wave have been done a lot. Even though the VIV is an important source of fatigue damage for SCR, the evaluation method and behavior characteristics by VIV have not been studied relatively. Most of the S / W for calculating VIV fatigue are a semi-empirical model based on various theoretical models and experiments. For better understanding of VIV response, it is necessary to investigate the effect of parameters which affects the analysis result. This paper summarizes the results of parametric study performed to enhance the understanding of relationship between each parameter and fatigue analysis result.
Jung, Hyun Ho,Shin, Jaewoo,Kim, Jinhyung,Ahn, Seung-Hee,Lee, Sung Eun,Koh, Chin Su,Cho, Jae Sung,Kong, Chanho,Shin, Hyung-Cheul,Kim, Sung June,Chang, Jin Woo Hindawi Publishing Corporation 2016 Neural plasticity Vol.2016 No.-
<P>It is well known that the insular cortex is involved in the processing of painful input. The aim of this study was to evaluate the pain modulation role of the insular cortex during motor cortex stimulation (MCS). After inducing neuropathic pain (NP) rat models by the spared nerve injury method, we made a lesion on the rostral agranular insular cortex (RAIC) unilaterally and compared behaviorally determined pain threshold and latency in 2 groups: Group A (NP + MCS; <I>n</I> = 7) and Group B (NP + RAIC lesion + MCS; <I>n</I> = 7). Also, we simultaneously recorded neuronal activity (NP; <I>n</I> = 9) in the thalamus of the ventral posterolateral nucleus and RAIC to evaluate electrophysiological changes from MCS. The pain threshold and tolerance latency increased in Group A with “MCS on” and in Group B with or without “MCS on.” Moreover, its increase in Group B with “MCS on” was more than that of Group B without MCS or of Group A, suggesting that MCS and RAIC lesioning are involved in pain modulation. Compared with the “MCS off” condition, the “MCS on” induced significant threshold changes in an electrophysiological study. Our data suggest that the RAIC has its own pain modulation effect, which is influenced by MCS.</P>
Medial Forebrain Bundle (MFB) Stimulation in Rats for Behavioral Control
( Chanho Kong ),( Jaewoo Shin ),( Yena Lee ),( Yoon Kyung Cho ),( Soonyoung Kim ),( Jaesung Cho ),( Hyun Ho Jung ),( Sang Beom Jun ),( Jin Woo Chang ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
Medial forebrain bundle (MFB) is a part of the reward system, involved in the integration of pleasure and reward. Previous studies used various stimulation parameter values for operant conditioning, but the effectiveness of each parameter value has not been systematically studied. Our study investigated the optimal parameter value for operant conditioning. Electrodes were implanted in the MFB region (AP:-2.3mm, ML:1.8mm DV:8.6mm) of Male Spraque-Dawley rats (n = 9, 250 ~ 300g). Tungsten array electrodes were for the MFB stimulation. After implantation, we conducted a self-training experiment where an electrical stimulation is sent to the MFB region via the implanted electrodes upon pressing of a lever in the Skinner box. Magnitude of the electrical stimulation was gradually incresed from 50uA to 350uA. Individuals that pressed the lever more than 30 times per minute were used for the maze experiment. Individuals pressed the lever most frequently when magnitude of the stimulation was 200uA-280uA. Also, we were able to successfully control one individual’s direction by using MFB stimulations in the maze experiment. Our results showed positive prospects in behavioral control of rats via MFB stimulation in range of 200uA . 280uA. Based on our results, we anticipate that more efficient training for operant conditioning could be possible using optimal parameters. This study was supported by the grant from CABMC (Control of Animal Brain using MEMS Chip) funded by Defense Acquisition Program Administration (UD140069ID)
PATH GENERATION ALGORITHM BASED ON CRASH POINT PREDICTION FOR LANE CHANGING OF AUTONOMOUS VEHICLES
Chanho Park,Nak-Tak Jeong,Dongyeon Yu,Sung-Ho Hwang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3
To reduce the calculation time needed to determine the optimal path, the form of the road and the path of an autonomous vehicle were linearized; additionally, among multiple obstacles, only those that were potentially dangerous were chosen. By considering the movement of moving obstacles, the cost was calculated. The calculation time was shortened by reducing the number of design variables of the optimal path, when changing lanes to avoid obstacles, to two. Limiting conditions, such as the lateral and longitudinal acceleration, were excluded from the cost calculation by restricting the search region of the design variable. The final result was calculated using a relatively free search of the golden-section search regarding the initial value setting. For the golden-section search, the number of final design variables was reduced to one; this was done by optimizing the search direction. The search direction was determined based on the final position of the vehicles and the calculated optimal points. By including a collision avoidance algorithm and moving in a short period of time, the calculated optimal path prevented accidents due to path errors caused by simplification. The path could be found easily, even for complex road shapes and with multiple vehicles nearby.
유전자 알고리즘을 이용한 림프종 암의 최적 분류기 앙상블
박찬호(Chanho Park),조성배(Sung-Bae Cho) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1B
DNA microarray기술의 발달로 한꺼번에 수천 개 유전자의 발현 정보를 얻는 것이 가능해졌는데, 이렇게 얻어진 데이터를 효과적으로 분류하는 시스템을 만들어놓으면 새로운 샘플이 정상상태인지, 질병을 가진 상태인지 예측할 수 있다. 분류 시스템을 위하여 여러 가지 특징선택방법들과 분류기법들을 사용할 수 있는데, 모든 상황에서 항상 뛰어난 성능을 보이는 특징선택법이나 분류기를 찾기는 힘들다. 안정되고 개선된 성능을 내기 위해서 특징-분류기의 앙상블을 이용할 수 있는데, 앙상블에 이용될 수 있는 특징선택방법이나 분류기의 수가 많다면, 앙상블을 만들 수 있는 조합이 많아지기 때문에, 모든 조합에 대하여 앙상블 결과를 구하기는 거의 불가능하다. 이를 해결하기 위하여 본 논문에서는 유전자알고리즘을 이용하여 모든 앙상블 결과를 계산하지 않으면서 최적의 앙상블을 찾아내는 방법을 제안하였으며, 실제로 림프종 암 데이터에 적용한 결과 100%의 결합결과를 보이는 최적의 앙상블을 효과적으로 찾아내었다.