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안희철,안지윤,손유동 대한노인병학회 2008 Annals of geriatric medicine and research Vol.12 No.2
As the elderly population continues to grow, the number of geriatric patients reported to poison centers continues to increase. Older poisoned patients are at an increased risk of death compared to younger adult patients. The purpose of this paper is to report a case of hydrofluoric acid poisoning along with a discussion of poisoning characteristics. A 79 year-old male with dementia visited emergency department presenting epigastic discomfort after ingestion of 50% hydrofluoric acid solution. At admission, he presented with a stable vital sign but progressed to pulseless electrical activity. In spite of advanced resuscitation efforts and administration of calcium gluconate, he rapidly detoriated and died 3 hours after the ingestion.
안희철,서태현,정동일,이충규 조선대학교 IT연구소 2019 정보기술융합공학논문지 Vol.9 No.1
We propose the development of a monitoring and communication system for network control of multiple objects. The data is collected from remote mobile objects through wireless networks. The data is collected from GPS modules and IMU sensors, converted into a data packets, transmitted to the monitoring system. We implement the monitoring and communication system based on a low-cost single-board computer. The connection is flexible since mobile objects are able to communicate with each other. We demonstrate the system operation in Chosun University campus. As a result, we confirm object positioning and transmission/reception of messages through communication between objects. 본 논문은 다중객체 네트워크 제어를 위한 모니터링 통신시스템을 제안한다. GPS와 IMU 센서로부터 수신된 데이터는 단일 패킷으로 변환된 후 모니터링 시스템으로 전송된다. 저비용 단일보드 컴퓨터를 사용하여 모니터링 통신시스템을 구현하였으며, 모바일 객체 사이의 직접 통신이 가능하여 유연한 연결구성이 가능하다. 시스템 동작 여부를 확인하기 위하여 조선대학교 캠퍼스 내에서 시험을 수행하였다. 결과적으로 각 객체 간 통신으로 객체의 위치 확인, 내부명령어의 송수신, 개별 메시지의 송수신을 확인하였다.
안희철,나수환,주현우,김태완 한국전기전자재료학회 2009 Transactions on Electrical and Electronic Material Vol.10 No.1
We have studied organic layer-thickness dependent electrical and optical properties of bottom- and top-emission devices. Bottom-emission device was made in a structure of ITO(170 nm)/TPD(x nm)/Alq3(y nm)/LiF(0.5 nm)/Al(100 nm), and a top-emission device in a structure of glass/Al(100 nm)/TPD(x nm)/Alq3(y nm)/LiF(0.5 nm)/Al(25 nm). A hole-transport layer of TPD (N,N'-diphenyl-N,N'-di(m-tolyl)-benzidine) was thermally deposited in a range of 35 nm and 65 nm, and an emissive layer of Alq3 (tris-(8-hydroxyquinoline) aluminum) was successively deposited in a range of 50 nm and 100 nm. Thickness ratio between the hole-transport layer and the emissive layer was maintained to be 2:3, and a whole layer thickness was made to be in a range of 85 and 165 nm. From the current density-luminance-voltage characteristics of the bottom-emission devices, a proper thickness of the organic layer (55 nm thick TPD and 85 nm thick Alq3 layer) was able to be determined. From the view-angle dependent emission spectrum of the bottom-emission device, the peak wavelength of the spectrum does not shift as the view angle increases. However, for the top-emission device, there is a blue shift in peak wavelength as the view angle increases when the total layer thickness is thicker than 140 nm. This blue shift is thought to be due to a microcavity effect in organic light-emitting diodes.