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오이석,이원달 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
본 논문에서는 network analyzer와 안테나를 이용하여 Ku-밴드 레이다 시스템을 구성하고, 그 레이다 시스템을 이용하여 RCS를 정확히 측정할 수 있는 기술을 개발한다. 정확한 산란 세기를 측정하기 위해서는 레이다 시스템을 정확히 보정하는 기술(calibration technique)이 필요하다. 본 논문에서는 레이다 시스템을 정확히 보정하기 위해서 RCS를 알고 있는 sphere, cylinder, trihedral의 이론적 RCS를 구하고 보정되지 않은 레이다 시스템으로 측정한 RCS와 비교한다. 여기에서 system loss, 거리 보정, 안테나 위치 보정과 같은 오차를 줄이고 산란 특성을 정확히 계산하는 보정기술을 연구하였다.
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The Political Economy of Korea's Industrialization
李元達 嶺南大學校社會科學硏究所 1985 社會科學硏究 Vol.5 No.2
Recently Korea has been an object of growing interest owing to its remarkable economic achievements. The purpose of this presentation is to discuss, from somewhat long-ranged perspective, Korea's economic development which is the core of its modernization. My presentation is composed of three sections. The first section gives a brief outline of the economic development during the last two decades, with an emphasis on a series of development strategies which the Korean government adopted according to the shift in policy priority. In the second section, some historico-cultural heritages are examined in an attempt to find out the roots of some essential factors of the economic development, and hopefully, arrive at deeper understanding of Korea's modernization. Lastly, a summary of the foregoing discussion and an enumeration of the major problems that the Korean economy faces are given.
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男子高等學生 運動選手의 運動後 恢復期의 血液 gas 分析과 血中葡萄糖 및 乳酸濃度變化
鄭武達,李元晶,朴載植,朱永恩 慶北大學校 醫科大學 1983 慶北醫大誌 Vol.24 No.2
一般 男子高等學校 學生과 同一한 運動負荷後 男子高等學校 陸上 및 排球運動選手들의 恢復期 0分, 5分, 10分 및 20分에서 靜脈血中 變化를 一般 男子高等學校 學生과 比較해 본 本 硏究의 結果를 要約하면 다음과 같다. 同一 運動負荷에 대해 運動選手는 心搏數의 變化가 적었으며 恢復이 빨랐다. pH의 變化도 運動選手가 적었으며 빠른 恢復을 보였다. 즉 對照群의 pH는 7.335±0.005이었으며 運動直期에는 7.137±0.015로 크게 減少한데 비해 陸上選手와 排球選手는 各各 7.339±0.005와 7.302±0.008에서 7.198±0.029 및 7.190±0.012로 減少 幅이 적었고 20分에는 運動選手群들은 安定時와 差異가 없었으나 對照群은 아직 有意한 減少를 나타낸 狀態였다. 酸性化程度를 나타내는 BE나 HCO_3^-含量도 pH와 마찬가지로 運動選手群은 變化가 적었고 빠른 恢復을 보였다. 運動直後 選手群 및 對照群 모두 二酸化炭素分壓은 有意하게 增加하였으며 運動 20分에 對照群은 安定時와 差異가 없었으나 運動群은 오히려 有意한 減少를 보였다. 安定時 對照群의 靜脈血中 酸素分壓은 20.8±1.22㎜Hg였으나 運動直後에는 15.3±1.94㎜Hg로 有意한 減少를, 5分과 10分에는 오히려 有意한 增加를 보인 뒤 20分에는 安定時 値로 되돌아 왔다. 하지만 運動選手群의 運動直後에는 有意性이 없었고 5分부터는 有意하게 增加하여 運動 20分에도 有意하게 높은 酸素分壓을 보였다. O_2CT나 O_2SAT도 거의 같은 變化 樣相을 보였다. 對照群의 安定時 血糖濃度는 90.2±1.76㎎/㎗이었으며 運動後 5分에는 116.5±5.33㎎/㎗로 有意한 增加를 한 뒤 20分까지 112.9±5.00㎎/㎗로 有意하게 높은 狀態였다. 반면 運動選手는 安定時 84.0±1.39와 87.8±2.82㎎/㎗에 比해 運動 10分에서만 101.6±6.66 및 104.6±6.22㎎/㎗로 有意하게 增加하였을 뿐, 20分에는 83.5±3.75 및 91.5±3.80㎎/㎗로 安定時로 恢復되었다. 즉 運動選手는 血糖濃度의 變化가 對照群보다 적었다. 血中 乳酸濃度의 變化도 血糖濃度 變化와 비슷하게 運動選手의 變化 幅이 적었다. 즉 安定時 對照群은 16.5±1.88㎎/㎗이었으며 運動直後는 75.1±3.39㎎/㎗로 有意한 增加後 20分까지 有意한 增加狀態였으나 運動選手들은 運動 5分에 有意하게 最高로 增加하였고 20分에도 有意한 增加 狀態지만 對照群보다는 有意하게 낮았다. The study was carried out to elucidate the effect of exercise on the venous blood gas tension, pH and blood glucose and lactate levels. The subjects chosen for this study were 31 athletic male high school students of 16-19 years of age consisting of 12 vollryballers and 19 field and track athletes. The athletes had about three years of exercise career, and were compared with 20 students who were not directly engaged in any form of regular physical exercise. The subjects were directed to perform running on the treadmill for three minutes under the condition of 15% degree tilt and 5 MPH. Venous blood samples were taken at rest as well as 0, 5, 10 and 20 minutes after the exercise to study the changes during the recovery period. The venous blood Pco_2, P_o2 and pH were determined Blood Gas Analyzer by Corning CO., glucose by enzymatic method, and lactate by Baker and Summerson method. The result thus obtained were compared with the control and summarized as follows: In all the group studied, the venous P_co2 was significantly increased immediately after the exercise, but the tendency of decrease to the normal value was observed in both the control and athletic groups with the significant decrease at 10 and 20 min after the exercise in the athletic groups. Blood pH in the control was significantly decreased from the resting value of 7.335±0.005 with the lowest value of 7.124±0.022 at 5 min and 7.199±0.028 at 20 min. In the athletic group, the blood pH showed a similar pattern as in the control except a complete return to the resting value at 20 min. HCO_3^- and base excess as an indicator of body acidity exhibited the same pattern as in pH. The venous blood P_o2 in the control group showed a significant decrease immediately after the exercise. A significant increase at 5 and 10 min followed by a return to the resting value. In the athletic group, however, the pattern in P_o2 was different from that of the control showing a significant increase till 20 min. The blood glucose concentration in the control group showed a significantly elevated value from 5 min to 20 min after the exercise. In contrast to the control, the athletic group(i.e., track runners and volleyballers) showed a lower than the normal value(84.0±1.39 and 87.8±2.82㎎/㎗, respectively) at the rest, a slightly high value(101.6±6.66 and 104.6±6.22㎎/㎗, respectively) at 10 min and the normal value at 20 min after the exercise. The blood lactate level in the control immediately after the exercise was significantly elevated(75.1±3.39㎎/㎗) from the resting value of 16.5±1.88㎎/㎗. In the athletic group, the pattern of blood lactate level was similar to the control but the recovery was faster. From the above, it is likely that the athletic students are better adjusted physiologically to the same work load compared with the nonathletes because athletes's blood pH, glucose and lactate contents are relatively stable, and shows higher P_02 and lower P_co2 during the recovery period.
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