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레이저 스캐너 기반 건설장비 작업환경 모니터링 기술 개발
박성렬(Sungyoul Park),오광석(Kwangseok Oh),박진선(Jin Sun Park),김진균(Jin-Gyun Kim),서자호(Jaho Seo),이근호(Geun Ho Lee),이경수(Kyongsu Yi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Currently, the interests on safety of heavy machinery operation is highly increasing due to growth of construction accidents caused by inexperienced operator, worker’s carelessness, and so on. Therefore, the demand of the automation technology on construction machinery comes to the fore. This paper presents an environment monitoring technology of working site for construction machinery based on laser scanner. The proposed monitoring systems consists two parts. The first part is environmental perception based on one-layer laser scanner processing which estimates object states and classifies. The second part is working area estimation and prediction by analyzing position and velocity kinematics of excavator. It is shown that the proposed working area monitoring technology enhances environment perception performance and safety of construction site.
박성렬(Park, Sung-Yul L.),김희원(Kim, Hee Won),김상덕(Kim, Sang Duk),김종환(Kim, Jong Hwan),김범성(Kim, Bum Sung),이돈희(Lee, Don Hee) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Thin film a-Si solar cells deposited by PECVD have many advantages compared to the traditional crystalline Si solar cells. They do not require expensive Si wafer, the process temperature is relatively low, possibility of scaling up for mass production, etc. In order to produce thin film solar cells, understanding the relationship between the material characteristics and deposition conditions is important. It has been reported by many groups that the band gap of the a-Si material and the deposition rate has an linear relationship, when RF power is used to control both. However, when the process pressure is changed in order to control the deposition rate and the band gap, a diversion from the well known linear relationship occurs. Here, we explain this diversion by the deposition condition crossing different plasma regions in the Paschen curve with a simple model. This model will become a guide to which condition a-Si thin films must be fabricated in order to get a high quality film.
차선 및 연석 정보 활용한 차량 위치 추정 기술 기반 자율 주행
박성렬(Sungyoul Park),이현성(Hyunsung Lee),정용환(Yonghwan Jeong),김선욱(Seonwook Kim),이호준(Hojoon Lee),이경수(Kyongsu Yi) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This paper presents a lane information based vehicle localization algorithm for application to automated driving on complex urban roads. Vehicle position estimation of centimeter-level with low-priced commercial sensor setup is one of the emphasis in automated driving. The fusion approach of localization algorithm utilizes LiDAR, Around View Monitoring (AVM) camera and vehicle chassis sensor. The proposed localization algorithm consists of several sections: a lane detection and fusion, a map-matching based position correction, an extended Kalman filter (EKF) based localization filter and validation gate. A lane information is detected and combined from LiDAR reflectivity signals and AVM image around the vehicle. This integrated lane information is possible to correct the ego vehicle position by the iterative closest point (ICP) algorithm which calculates the rigid transformation between the digital lane map and lanes obtained by LiDAR and AVM. The corrected vehicle position by transformation is fused with the information of vehicle chassis sensors based on EKF. The performance of proposed localization is verified through vehicle experiments on a driver’s license test course in Korea.
청소년이 체육수업에서 지각하는 자기결정성 프로파일과 정신건강의 관계 검증
박혁(Park, Hyeok),강효영(Kang, Hyoyoung),박성렬(Park, Saengryeol) 한국체육교육학회 2023 한국체육교육학회지 Vol.28 No.5
Purpose: This study was aimed to examine latent profiles of autonomy supports from teachers and friends, basic psychological needs, and self-determination on loneliness and depression in adolescents. Methods: Participants(n= 363) completed questionnaires to measure autonomy supports, basic psychological needs, self-determination, loneliness and depression. We conducted confirmatory factor analysis to measure construct validity and latent profile analysis. Subsequently, difference tests were done to examine discrepancies of latent classes on outcome variables. Results: Threes class model was confirmed(group 1: non self-determined(33%), group 2: moderate(49%), group 3: self-determined(19%)). Individuals in higher groups showed high levels of loneliness than lower groups. Individuals in moderate and self-determined groups showed lower levels of depression than their counterparts. Conclusion: Further studies are guaranteed to develop the ways of improving self-determination through teachers and friends in physical education setting.