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밀리미터파를 위한 Monolithic Power Divider/Combiner의 설계에 관한 연구
나극환 光云大學校 1988 論文集 Vol.17 No.-
밀리미터파 대역에서 모노리딕 또는 하이브리드 기판에 프린트 될 수 있는 여러 가지 power divider/combiner를 CAD에 의해 최적 조건으로 설계하고 그 결과를 비교 검토하였다. CAD를 위한 소프트웨어는 SUPERCOMPACT를 이용하였으며 power divider/combiner의 각 branch 사이의 결합효과와 마이크로 스트립선로를 따른 손실까지도 고려되었다. 특히, 기존의 Wilkinson divider를 surface mounting에 적절하도록 수정하였고, 그 등가회로부터 수정효과를 분석 응용하였다. In this paper, various power dividers/combiners for millimeter waves which can be printed on the substrates of hybrid or monolithic ICs are designed and studied. The coupling effect between .the branches of power dividers/combiners and the conductor loss of micro-strip lines are considered using the commercial CAD program, SUPERCOMPACT. In particular the existing wilkinson Power Dividers/Combiners is modified and employed by its equivalent circuit.
한국산 표고버섯에서 분리한 Cysteine Sulfoxide Lyase 효소의 특성
이극로,김정숙 서강대학 지역발전연구소 1996 지역발전연구 : 서강전문대 Vol.2 No.-
Properties of cysteine sulfoxide lyase from Korean Lentinus edodes have been investigated. The optimum pH and temperature of cysteine sulfoxide lyase were the pH range of 8.0 to 9.0 at temperatures from 35 to 40℃. The enzyme were stable at temperatures lower than 40℃ and pH range of neutral to weakly alkaline pH. Des-glutamyl lentinic acid was the best substrate for cysteine sulfoxide lyase.
김극로,장덕선 群山大學校 1996 論文集 Vol.23 No.-
This study examined the effects of acute dance activity program on mood states. Subjects participated 70 persons ranging of women in age from 29 to 65 years. The profile of Mood States(POMS) was also completed before and after the Sport Dance, Bong-San Fork Dance, Charming Disco. The results consistent with previous research, the present study also found improvements in mood following dance activity program on positive factors of the POMS scales but indicated decrease in mood following dance activity program on negative factors of the POMS scales.
신극선,백태준,이은정,이혜경 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1
Although many operative techniques have been developed to approach the parotid a gland, high recurrence rate and the occurrence of facial palsy still remain to be dilema in the parotidectomy. After reviewing 179 cases of parotid tumor retrospectively, including 8cases which utilized the peripheral approach, the authors came to the following conclusions. 1) The sex ratio is 1 : 1 and the mean age of occurrance was 43.1 for benign tumors and 43.4 for malignant tumors. 2) The histopathologic findings showed that 155 cases were benign tumors(86.5%)and 24 cases were malignant tumors(13.5%) 3) Among the benign tumors, the mixed tumor was the most common(126 cases, 81.2%)and in the malignant tumors the mucoepidermoid tumor was the most common(12 cases, 50%). 4) The truncal approach for parotidectomy was used in 171 cases, and the peripheral approach in 8 cases. 5) The peripheral approach is superior to the truncal approach because it can provide with a better surgical field ; the branches of facial nerve can be identified more superficially, and thus the liability of facial nerve injury is much lessened especially in large tumors. The peripheral approach also coincides with the embryologic development of parotid gland.
신극선,탁관철,윤정섭 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1
Eighty-three consesutive free-flap transfers were reviewed to analyze distribution of type of reconsturctions, kinds of donor flaps as well incidence of complications. The role of emergent exploration and the effect of preoperative wound conditions in flap survival were evaluate. Free flap transfer for head and neck reconstruciton was most common as 46 cases, followed by for upper extremity of 22cases, for lower extremity 12 cases and for trunk & breast 3 cases. Two patients exhibited within 7 days after the operation because of respiratory complications. Eight flaps exhibited signs of circulatory insufficiency between 5 hours and 7 days. three were managed conservatively with ultimate partial necrosis of the flaps. Five flaps required return to the operating room. On exploration, early arterial occlusion was revealed in 1 flap, late arterial occlusion in 2 flaps, late venous occlusion in 1 flap and hematoma in 1 flap. The average time from the first abnormal examination to exploration was 2.4 hours. There were no false-positive explorations. Two free flaps in which abonormal findings were first noticed 4 days and 7 days after microsurgical transfer respectively failed in spite of the correction of the cause of circulatory compromise. The remaining 3 flaps were salvaged following the correction of the cause. Recipient vessel problems such as irradiation and infection were the most common cause of circulatory crisis. Among the five flaps requiring return to the operating room. single vein was anastomosed in four flaps and two veins in the remaining one. In the totally failed two flaps only songle vein was anastomosed. The results of this study demonstrate the efficacy of clinical monitoring and the role of early exploration. Precautious selection of recipient vessels and two vein anastomosis are recommended for safe and better prognosis.