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곽현철,송승영,석호태 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
Heat acquirement caused by envelope system and load caused by infiltration of vestibule are large part of total cooling load in refrigerated warehouse. Especially, the vestibule of refrigerated warehouse is a place where infiltration most happens than anywhere else because of different temperature between indoor and outdoor space. Therefore, the load of refrigerated warehouse may sharply decrease when the load of vestibule decreases. In this paper, we defined the types of vestibule through investigating actual conditions about refrigerated warehouse that operates now. And then, based on this investigation results, we measured change of temperature and figured out air change rates of the type of vestibule and infiltration prevent devices by using down-scale model. After that, we found the amount of air change rate in order to estimate the load of air change easily in facility plan.
곽현철,석호태,송승영,황혜주,안홍섭 대한설비공학회 2002 설비공학 논문집 Vol.14 No.1
In this paper, several types of infiltration prevention devices that are currently in use have been studied through experimental investigation. Firstly, the types of infiltration prevention devices were defined through investigating actual conditions of refrigerated warehouse in operates. Based on this investigation results, measured change of temperature and figured out air change rates of the type of infiltration prevention devices by using scale down model. After that, found the amount of air change rate in order to estimate the load of air change easily in facility plan.
차량 내 네트워크 통신의 기능안전성을 위한 하드웨어 기본 설계
곽현철(Hyun Chul Koag),안현식(Hyun-Sik Ahn) 대한전기학회 2017 전기학회논문지 Vol.66 No.9
This paper presents a basic ECU(Electronic Control Unit) hardware development procedure for the functional safety of in-vehicle network systems. We consider complete hardware redundancy as a safety mechanism for in-vehicle communication network under the assumption of the wired network failure such as disconnection of a CAN bus. An ESC (Electronic Stability Control) system is selected as an item and the required ASIL(Automotive Safety Integrity Level) for this item is assigned by performing the HARA(Hazard Analysis and Risk Assessment). The basic hardware architecture of the ESC system is designed with a microcontroller, passive components, and communication transceivers. The required ASIL for ESC system is shown to be satisfied with the designed safety mechanism by calculation of hardware architecture metrics such as the SPFM(Single Point Fault Metric) and the LFM(Latent Fault Metric).
오현철(Hyun Cheol Oh),서재완(Jae Wan Suh),곽대경(Dae Kyung Kwak),윤한국(Han Kook Yoon) 대한정형외과학회 2013 대한정형외과학회지 Vol.48 No.3
대퇴 간부 골절에서 골수강 내 금속정 삽입술은 널리 사용되는 방법으로 교합나사의 삽입은 경피하에 삽입하며 특히 원위부는 가이드 없이 삽입하게 된다. 교합나사에 의한 혈관에 대한 합병증은 드물게 생기며 원위부 교합나사에 의해 발생한 지연성 가성 동맥류(delayed pseudoaneurysm)에 대해서는 아직 국내에서 보고된 바가 없었다. 이에 저자들은 지연성 가성 동맥류 2예를 경험하여 문헌고찰과 함께 보고하는 바이다. Interlocked intramedullary nailing is widely accepted for treatment of closed femoral shaft fractures. An interlocking screw is inserted percutaneously, and especially the distal screw is inserted without use of a guide. Vascular complications associated with an interlocking screw in intramedullary nailing are rare. No case of delayed pseudoaneurysm caused by a distal interlocking screw has yet been reported in Korea. We present two cases of delayed pseudoaneurysm caused by a distal interlocking screw several months after intramedullary nailing.
석호태,곽현철,송승영,송진규,이영욱 대한건축학회 2003 대한건축학회논문집 Vol.19 No.4
This study aims to evaluate the economic performance of infiltration prevention devices for the refrigerated warehouse. It is showed that the cooling loads of refrigerated warehouses is changed by assembling of infiltration prevention devices in a previous study. Space loads and cooling energy costs according to the types of the infiltration prevention devices are analyzed by the DOE-2.1E simulation. Based on the Life Cycle Costs considered the costs of initial construction, repair·replace, cooling energy and operating energy, the probability of reducing energy consumption and application of infiltration prevent devices in vestibule of refrigerated warehouse is founded.