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마이크로파 대역에서 실내 환경의 경로손실인자를 사용한 통계적 모델링
이권익,홍석욱,강부식,김흥수 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1
In this paper, indoor propagation characteristics are analyzed for various environments such as corridors, walls and corners at microwave band. In order to present the statistical model for indoor environments the loss factors of each case are obtained by linear regression analysis method with the function of logarithmic distance between transmitter and receiver. Comparisons of our predicted results to measurements indicate that improvements in accuracy over conventional statistical models are achieved.
장우진,홍석욱,송원섭 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
편의점 조명설계시 조도계산에 필요한 광원 특성을 일률적으로 적용하여 설계 조도와 실제 조도사이의 오차가 크며, 과다한 조명설비로 인하여 전력량을 낭비하고 있다. 조명시뮬레이션과 실측을 통해 문제점과 해결책을 제시하고 시설되어 있는 조명을 교체함으로써 조명소비전력량을 절약하는 방향을 제시한다.
당뇨병 환자에서 자율신경병증과 교정한 QT 간격과의 관계
조정구(Chung Gu Cho),임동석(Dong Suk Lim),최석채(Suk Chae Choi),홍석욱(Seung Wook Hong),장근(Geun Jang),김동훈(Dong Hun Kim),김창일(Chang Il Kim),박옥규(Ock Kyu Park) 대한내과학회 1991 대한내과학회지 Vol.41 No.2
N/A A simple method for evaluating alterations in cardiac sympathetic innervation may be measurement of the QT interval. Ninety-nine diabetic patients were separated into 4 groups based on the presence and degree of cardiac autonomic neuropathy (CAN) with noninvasive cardiovascular reflexes and blood pressure responses. None of the patients had evidence of ischemic heart disease, arrhythmia, or electrolyte imbalance. The corrected QT interval (QTc) was determined at rest with Bazett's formula. As a group, diabetic patients with 4 abnormalities of cardiac autonomic function had a longer QTc interval than those with no evidence of CAN. Diabetic patients with > 1 abnormality had a prolonged QTc interval compared with the control group of 68 healthy nondiabetic subjects. The frequency of prolonged (>430 ms, normal+2SD) resting QTc intervals increased with the increased number of abnormalities (0, 1-3, ?4): 19, 33, and 49%, respectively, Thirty out of 35 (86%) patients with a QTc >430ms had evidence of CAN. However, 59% (43 out of 73) of the patients with CAN had a normal QTc interval. These data provide evidence of a relationship between the presence and severity of CAN and degree of QTc interval prolongation. Compared with cardiovascular reflexes and blood pressure tests for CAN, the QTc interval in the group of diabetic patients studied without evidence of heart or electrolyte imbalance was an insensitive but specific marker. An abnormal QTc interval may be an additional diagnostic tool for evaluating CAN in patients with diabetes mellitus.