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An Ontology-based Assembly Sequence Planning System
Hongseok Park,Yongqiang Wang,Jinwoo Park,Myongwoong Park (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Assembly sequence planning is the most important part of an assembly process planning and researches into this issue have been carrying out in the world wide. However, currently there is no systematic assembly sequence planning method. For this reason, a new approach is required to develop a planning strategy and algorithm to implement the assembly sequence planning system. Firstly, assembly feature is here defined as an information carrier for assembly-specific information. With the aim of enabling efficient and effective development of assembly sequence planning system by making full use of assembly feature, an ontology-based approach to modeling assembly feature is presented. The ontology-based assembly feature models are hierarchically organized. Based on the ontology framework, automatic generation of assembly sequence algorithm is designed to generate all feasible assembly sequences by assembly feature matching. In order to development of the prototype software system, the architecture of assembly sequence planning system is designed. This system is very useful tool for planner to make determination and finish the assembly sequence planning.
Hongseok Choi,Jong-Oh Park,Seong Young Ko,Sukho Park,Sungho Cho,Won-Gyun Jung,Yong Kyun Park,Jung Suk Kang 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.8
This paper describes a robotic patient positioning system (PPS) for a fixed-beam heavy-ion therapy system. In order to extend the limited irradiation angle range of the fixed beam, we developed a 6-degree-of-freedom (6-DOF) serial-link robotic arm and used it as the robotic PPS for the fixed-beam heavy-ion therapy system. This research aims to develop a robotic PPS for use in the Korea Heavy Ion Medical Accelerator (KHIMA) system, which is under development at the Korea Institute of Radiological & Medical Sciences (KIRAMS). In particular, we select constraints and criteria that will be used for designing and evaluating the robotic PPS through full consultation with KIRAMS. In accordance with the constraints and criteria, we develop a 6-DOF serial-link robotic arm that consists of six revolute joints for the robotic PPS, where the robotic arm covers the upper body of a patient as a treatment area and achieves a 15 roll and pitch angle in the treatment area without any collision. Various preliminary experiments confirm that the robotic PPS can meet all criteria for extension of the limited irradiation angle range in the treatment area and has a positioning repeatability of 0.275 mm.
Development of Current Collection Test-Bed for Preventive Maintenance on Metro Railway
Park Sungho,Jang Hongseok,Kim Jeong Yeon,Kim Seon-gon,Park Young 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
The pantograph of electric railway vehicles can cause various mechanical and electrical failures due to contact with the overhead contact wire. This paper presents a system that detects abnormal conditions of a pantograph using fve Complementary Metal-Oxide-Semiconductor (CMOS)-based cameras and a laser in the 808 nm band. For the abnormal conditions of the pantograph, three cameras detect defects of the contact strip, while two cameras detect the deformation of pantograph horns. The confguration can detect a range of 1200 mm for defects and abrasion of the pantograph contact strip, and a Field of View of 849 mm with a width of 17.46° and length of 5.72° for the deformation of pantograph horns. However, the performance test of the pantograph abnormal condition detector showed that while the setup could detect each defect, the accuracy was uncertain depending on the type of defect and the angle between the pantograph and camera. A system was confgured to detect abnormal conditions of the pantograph for metro railway vehicles on operating lines. The system will be used to verify and maintain test devices for monitoring the state of metro railway
Augmented Reality Application for Automotive Industry
Hongseok Park,Yakov K. Yen 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Competitiveness forces companies to invent more and more effective methods and tools for the planning of complex production systems. Virtual Reality technology introduced for design of manufacturing systems demonstrated a decrease in planning times as well as the improvement of the quality of planning results. Such introduction of various virtual planning tools implies the complete integration of all planning tasks and demands an intuitive interaction with complex computer models of factory layouts, equipment, facilities, etc. Known methods and tools are limited to a purely virtual representation of planning objects and thus require the complete 3D modeling of the whole manufacturing system. The high costs reduce the possible benefits of these tools and this technology in general. The technology of augmented reality (AR), as a new human-machine interface, introduces a noteworthy perspective for a new generation manufacturing system design. Using AR technology a physically existing production environment can be superimposed with virtual planning objects (3D CAD geometries). Planning tasks can thus be validated without modeling the surrounding environment of the production domain. In this paper we discuss the benefits of AR techniques in certain stages of manufacturing system planning activities and represent an application of AR technology in the field of Automotive Industry.
박홍석(Hongseok Park),박성범(Sungbum Park),문상민(Sangmin Moon),이창우(Changwoo Lee),이규봉(Gyubong Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Nowadays, the automation in assembly field with robot gets an increasing importance. The putting of spare tire in trunk is still dominated by free dropping. By that parts in trunk, e.g. luggage room lamp, jack and so on were damaged and the complaint of assembler in the next process was occurred due to physical strength. To eliminate these, the robot system was in this paper developed to place spare tire on the mounting hole in trunk. The movement of robot was synchronized with the velocity of chassis hanger.<br/> With this automated system the productivity of the assembly line was increased from the benefits such as simplification of the system using only robot without the mechanically synchronized transport, inserting spare tire into the right position with robot, reduction of damaged parts and production of various type of car.
대학생의 자존감이 정적정서성과 정신적 웰빙에 미치는 영향: 자기인식의 조절효과
박홍석 ( Hongseok Park ),이정미 ( Jeong-mi Lee ) 한국학교사회복지학회 2021 학교사회복지 Vol.- No.53
본 연구에서는 자존감이 정적정서성과 정신적 웰빙에 미치는 영향을 살펴보고, 자기인식이 그들 간의 관계를 조절하는지 살펴보고자 하였다. 본 연구를 위해 서울 및 수도권 소재 대학교 재학생 603명의 자료를 수집하여 분석하였다. 자존감과 정적정서성 및 정신적 웰빙 간의 관계에서 자기인식의 조절효과를 확인하기 위해서 Hayes(2012)가 개발한 SPSS Macro PROCESS에서 경로모형 검증과 함께 이루어지는 Bootstrapping 방법을 이용하여 간접효과의 유의성을 검증하였다. 연구결과를 요약하면 다음과 같다. 첫째, 여러 선행연구에서 밝혀진 바와 같이 대학생의 자존감은 정적정서성 및 정신적 웰빙에 유의한 정적 영향을 미치는 것으로 나타났다. 이로써 자존감이 우리나라 대학생들의 정적정서성 및 정신적 웰빙에 주요한 요인 중 하나임이 밝혀졌다고 하겠다. 둘째 자존감과 정적정서성 간의 관계에서 자기인식의 조절효과가 통계적으로 유의한 것으로 밝혀졌다. 이는 자존감이 정적정서성에 미치는 영향이 자기인식 정도에 따라 차이가 있으며, 자기인식을 잘 할수록 정적정서성에 미치는 자존감의 영향력이 크다는 것을 의미한다. 마지막으로 자존감과 정신적 웰빙 간의 관계에서 자기인식의 조절효과는 통계적으로 유의하지 않은 것으로 나타났다. 이는 우리나라 대학생들은 자기인식과 관계없이 자존감이 일관되게 정신적 웰빙에 영향을 미치는 결정적인 요인임을 시사하는 결과라 하겠다. In this study, we examined at the effects of self-esteem on affectivity (affect balance rate) and mental well-being, and examined whether self-awareness moderates the relationship between them. Data from 603 college students were collected and analyzed for this study. To determine the moderation effect of self-awareness in the relationship between self-esteem and mental well-being, we analyze the significance of indirect effects using Bootstrapping method with path model verification in SPSS Macro PROCESS developed by Hayes (2012). The results are summarized as follows: First, as several prior studies shown, the results of college students’ self-esteem having a statistically significant positive impact on affectivity and mental well-being have also been reproduced in this study. This proves that self-esteem is one of the main factors in affectivity and mental well-being of Korean university students. Second, the moderation effect of self-awareness in the relationship between self-esteem and affectivity has been statistically significant. This means that the impact of self-esteem on affectivity varies depending on the degree of self-awareness, and the more the self-awareness, the greater the influence. Finally, the moderation effect of self-awareness in the relationship between self-esteem and mental well-being has been shown to be insignificant. This can be seen as a result of reaffirming that self-esteem is a important factor that consistently affects mental well-being regardless of self-awareness.