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전병돈,박선규 중앙대학교 의과대학 의과학연구소 1993 中央醫大誌 Vol.18 No.3
One of the anesthesiologist's daily practices involves the care of hypertensive patients. Circulatory instability oceurs frequently in hypertensive patients during perioperative period. In the perioperative period, hypertensive patients often experience the episodes of marked hypertersion or hypotension, myocardial ischemia and arrhythmias. Therefore, it is very important to control the depth of anesthesia to minimize the wide fluctuation of bolld pressure during perioperative period. The author classified the hypertensive patients into systolic, diastolic, and combined (systolic and diastolic) hypertension to confirm whether there were significant differences of blood pressure fluctuation among the groups or not. The author investigated the changes of blood pressure and heart rate during perioperative period on 32 normotensive patients (normotensive group) and 63 essential hypertensive patiens(hypertensive group), divided into ghree subgroups such as systolic and diastolic hypertensive group(26 patients), isolated systolic hypertensive group(18 patients) and isolated diastolic hypertensive group(19 patients) at chung-Ang University Hospital from May 1992 to February 1993. The results were as follows; 1. The incidence of use of antihypertensives was 3% in normotensive group but 46% in systolic and diastolic hypertensive group, 33% in isolated systolic hypertensive group and 21% in isolated diastolic hypertensive group during perioperative period. 2. The most common preoperative chest X-ray and EKG finding was within normal limit in the three hypertensive groups. 3. Systolic and diastolic blood pressure were more fluctuated in systolic and diastolic hypertensive group than isolated systolic hypertensive group, and isolated diastolie hypertensive group had similar fluctuation to normotensive group during perioperative period. 4. Heart rate in systolic and diastolic hypertensive group had similar fluctuation with normotensive group while isolated systolic and isolated diastolic hypertensive group had little fluctuation during perioperative period.
봉제패턴에 따른 UHF RFID 태그 안테나 특성 연구
전병돈,조광년,지영주,김홍제,최상현,Jeon, Byungdon,Jo, Kwangnun,Ji, Youngjoo,Kim, Hongjae,Choi, Sanghyun 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.3
In this study, we have fabricated an RFID tag antenna of the sewing type, and not the embroidery type. In addition, we have measured its impedance, return loss, and reading range. The sewing patterns of two different densities are fabricated, and the properties of the RFID tag antenna have been measured. The measurement results show that the two-layer sewing pattern RFID tag antennas are better than the one-layer sewing pattern antennas. Upon comparison, with regard to the effect of the sewing density, it is found that a lower density is a better property. The maximum reading ranges are 70, 49, 84, and 85 cm, which are sufficiently long.
전병돈,주종현,정재훈,Jeon, Byung-Don,Joo, Jong-Hyun,Jeong, Jae-Hoon 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.2
In this paper, we measured the temperature-dependent electrical resistance of five kinds of conductive yarns for temperature-sensitive textiles. Conductive yarns for temperature-sensitive textiles are multilayered and contain copper filaments. Krifi Cu-1, 2, 3, 4, and 5 are composed of 2, 3, 4, 7, and 14 strands of the copper filament, respectively. Krifi Cu-3, 4, and 5 were covered with polyethylene terephthalate (PET) fiber for insulation. It was determined that the electrical resistance of Krifi Cu-1 and 2 increased by $40m{\Omega}$ and $27.1m{\Omega}$, respectively, with each $5^{\circ}C$ increase over the temperature range of $30-100^{\circ}C$. In addition, it was found that the temperature-dependent electrical resistance did not increase with increasing number of copper filaments. Temperature-sensitive textiles were manufactured by patterning two conductive yarns with high increment and determining the linearity of the temperature-dependent electrical resistance. For the temperature-sensitive textile patterned with Krifi Cu-2, the average electrical resistance was $71.4m{\Omega}$ but the electrical resistance was not linear with temperature. The temperature-sensitive textile patterned with Krifi Cu-2 showed an average electrical resistance of $68.6m{\Omega}$ and good linearity with temperature.