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튜브 확관 공정 중 발생하는 튜브의 내부 그루브 변형을 감소시키기 위한 확관볼 설계
신인철(Inchul Sin),김홍성(Hongseong Kim),박성훈(Seonghun Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The heat exchanger has grooves inside the tube to improve heat transfer efficiency. However, the heat exchanging efficiency is reduced due to the deformation of the grooves in the tube. Therefore, the purpose of this research is to design a tube expander to reduce the plastic deformation of the inner groove height of heat exchanger tubes during tube expansion process. The tube inner groove deformation was calculated by elastoplastic finite element analysis under the boundary conditions with the tube end fixed and a friction coefficient of 0.22 between the tube and tube expander. The deformation of the grooves in the tube expanded by the expander with a radius of 7.9 mm was reduced by about 25% compared to the expander with a radius of 5.3 mm. Based on the results, we plan to design a shape of the tube expander to further minimize deformation of the tube inner grooves in tube expansion.
모듈 기반 퍼스널 로봇의 결함 허용 지원을 위한 네트워크 연결 유지 관리 기법
최동희(Donghee Choi),박홍성(Hongseong Park) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
Middleware offers function that user application program can transmit data independently of network device. Connection management about network connection of module is important for normal service of module base personal robot. Unpredictable network disconnection is influenced to whole robot performance in module base personal robot. For this, Middleware must be offer two important function. The first is function of error detection and reporting about abnormal network disconnection. Therefore, middleware need method for network error detection and module management to consider special quality that each network device has. The second is the function recovering that makes the regular service possible. When the module closed from connection reconnects, as this service reports connection state of the corresponding module, the personal robot resumes the existing service. In this paper proposed method of network connection management for to support fault tolerant about network error of network module based personal robot.
모듈기반 퍼스널 로봇을 위한 Fault Tolerant 구조
백범현(Bumhyun Baek),지동준(Dongjun Jee),박찬정(Chanjung Park),한기성(Kisung Han),이선영(Sungyoung Lee),김경태(Kyeongtae Kim),홍성원(Sungwon Hong),박홍성(HongSeong Park) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
Many distributed applications is developed in various environment such as operating system, software platform. So, they exhibit different types of system behavior, status, during the course of their operation. Each such behavior may have different functional and non-functional requirements. Therefore, many distributed application need to fault-tolerance solution. Personal robot provide various service or application. Because personal robot has many application or service, it need to fault-tolerance architecture. A flexible architecture is required to provide dependability. In this paper, it is suggested a fault-tolerant architecture for module-based personal robot with module fault-tolerance, service fault-tolerance.