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대구지역 실내 외 공기중 주요 대기오염물질의 농도조사에 관한 연구
최진수,백성옥,김영민,박상곤,정점희,황승만 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
최근 현대인의 실내거주시간이 일상생활시간의 80% 이상을 차지할 정도로 크게 증가하면서 보건·위생학적 측면에서 실내공기질은 매우 중요한 관심사로 등장하게 되었다. 본 연구는 1994년 8월의 여름철과 1994년 12월 ∼1995년 1월의 겨울철에 대구를 중심으로 가정집, 사무실, 식당과 같은 3가지 유형의 일반주거환경 중 실내·외 공기를 대상으로 실행되었다. 측정항목으로는 RSP, CO, CO₂, NO₂등의 주요 기준성 오염물질과 Bioaerosol을 선정하였다. 본 연구의 결과, 각 성분대상물질의 실내·외 농도는 실내거주환경 및 여름과 겨울, 두 계절에 따라 영향을 받는 것으로 나타났으며 실내·외 농도비교에서 RSP, CO, CO₂의 실내농도는 대부분의 지역에서 실외에 비하여 높은 농도를 나타냈다. 각 실내거주환경에 따른 실내·외의 농도는 가정, 사무실에 비하여 식당에서 상대적으로 높은 농도를 나타냈으며 실내·외 농도비 또한 식당에서 상대적으로 큰 값을 나타냈다. 여름과 겨울의 두 계절에 따른 RSP, CO, CO₂의 실내·외 농도는 여름철에 비하여 겨울철에 더욱 높은 농도를 나타냈으나 Bioaerosol의 실내·외 colony/plate는 여름철에 더욱 높은 수치를 나타냈다. The study was carried out to investigate the concentrations of indoor air pollutants such as respirable suspended particulate (RSP), carbon monoxide (CO), carbon dioxide (CO₂), nitrogen dioxide (NO₂) and bioaerosol at homes, offices and restaurants in Taegu city. Indoor and outdoor concentrations of these pollutants were observed simultaneously from August 1994 for summer to January 1995 for winter. The results were summarized as follows : 1. Both in summer and in winter, the indoor concentrations of RSP, CO, and CO₂; were higher than the outdoor concentrations, the indoor concentrations of major air pollutants (RSP, CO, CO₂, NO₂) in restaurants were higher than those in homes and offices. 2. The indoor and outdoor concentrations of RSP, CO, and CO₂; in winter were significantly higher than those in summer, on the other hand. The CFU/plate of bioaerosol in winter was lower than that in summer. These results suggested that indoor levels of air pollutants were affected by various indoor characteristics such as smoking, cooking, ventilation rate, winter heating systems, and behavioral activity of occupants.
Modification of C/C Composite Bipolar Plate by Addition of Electro-Conductive Carbon Black
Seung-Kon Ryu,Taek-Sung Hwang,Seung-Goo Lee,Sun-A Lee,Chang-Soo Kim 한국탄소학회 2001 Carbon Letters Vol.2 No.3
Modification of C/C composite bipolar plate for improving electrical conductivity was carried out by addition of electroconductive carbon black (EC-CB). Carbon black was carefully mixed to methanol-containing phenolic resin, impregnated into 2D-carbon fabrics, hot pressed and then carbonized to obtain composite plate. Inclusion of electro-conductive carbon black enhanced the electrical conductivity of the C/C composites by increasing the conduction path. Addition of 10 vol% carbon black increased the electrical conductivity from 5.5/Ωcm to 32/Ωcm and reduced the crack formation by filling effect, resulting in the increase of flexural properties of composite plate. However, at carbon black content over 10 vol%, flexural properties decreased by delaminating role of excess carbon black at the interface in C/C composites.
Modification of C/C Composite Bipolar Plate by Addition of Electro-Conductive Carbon Black
Ryu, Seung-Kon,Hwang, Taek-Sung,Lee, Seung-Goo,Lee, Sun-A,Kim, Chang-Soo Korean Carbon Society 2001 Carbon Letters Vol.2 No.3
Modification of C/C composite bipolar plate for improving electrical conductivity was carried out by addition of electroconductive carbon black (EC-CB). Carbon black was carefully mixed to methanol-containing phenolic resin, impregnated into 2D-carbon fabrics, hot pressed and then carbonized to obtain composite plate. Inclusion of electro-conductive carbon black enhanced the electrical conductivity of the C/C composites by increasing the conduction path. Addition of 10 vol% carbon black increased the electrical conductivity from 5.5/${\Omega}cm$ to 32/${\Omega}cm$ and reduced the crack formation by filling effect, resulting in the increase of flexural properties of composite plate. However, at carbon black content over 10 vol%, flexural properties decreased by delaminating role of excess carbon black at the interface in C/C composites.
FPGA기반의 KTX용 실시간 제어네트워크(Tonard*) 물리계층 개발
황승곤(Hwang Seung-Kon),박재현(Park Jaehyun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Communication network in KTX (Korea Train eXpress), the express train system, has to transmit status variables periodically within tens of seconds and real-time control informations which has short reply like status transition or alarm. KTX uses Tornad* (TOken Ring Network Alsthom Device) network for this purpose. This network can send and receive messages which enable express train applications embedded in intelligence boards to communicate by itself. Layer 1, 2 of Tornad* is implemented with differential manchester encoding and IEEE 802.4 standard( token bus standard ) respectively. To implement layer 1 and 2, we implemented twisted pair modem using FPGA for layer 1 and used MC68824 from Motorola for layer 2. MC68824 bus arbitration and memory controller is implemented using CPLD.
뇌동맥류 파열 환자에서 경두개 Doppler검사에 대한 임상적 분석 : Preliminary Report
황용순,주진양,허승곤,이규창 대한신경외과학회 1990 Journal of Korean neurosurgical society Vol.19 No.10-12
The authors performed prospectively the transcranial Doppler monitoring of bilateral anterior and middle cerebral arteries in 15 patients with ruptured cerebral aneurysm. The entry criteria for the study were confined to the patients who were admitted within 3 days after bleeding and had clinical grades of Ⅰ, Ⅱ, or Ⅲ. The mean frequency shifts of bilateral anterior and middle cerebral arteries were increased immediately after ictus and showed continuous further elevation between the 3rd and 8th rupture days. After that, they normalized slowly. The increase of frequency shift preceded clinical ischemic symptoms and an early steep increase of frequency shift was correlated to a high chance for suffering delayed ischemic deficits. The thick clots in subarachnoid cisterns shown on CT scans taken within the third rupture day were correlated well to the severe increase of frequency shifts. The aggressive treatment was done on asymptomatic patients who showed relatively rapid increase of frequency shifts, and they had shown no or trasient mild ischemic symptoms.
정승태(Seung-Tae Jung),황정구(Jung-Goo Hwang),김진배(Jin-Bae Kim),김춘성(Chun-Sung Kim),박성준(Sung-Jun Park),남해곤(Hae-Kon Nam) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 배터리 전압에 관계없이 일정 파워로 충전시키기 위한 변압기와 릴레이를 통한 새로운 토폴로지를 제안하고자 한다. 본 시스템은 기존의 충전기가 전압에 대한 전류를 기준으로 하는 설계방식과 달리 충전기 전압에 대한 일정 전력을 기준으로 하여 충전시스템을 설계할 수 있는 새로운 충전 토폴로지를 구현하였다. 제안된 방식은 PSIM 시뮬레이션과 실험을 통하여 새로운 배터리 충전기 토폴로지의 고효율과 안정성을 검증하였다.