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김덕경,박혜진,양미경,서정은,권지혜 대한마취통증의학회 2016 Korean Journal of Anesthesiology Vol.69 No.1
During laparoscopic surgery, carbon dioxide (CO2) pneumothorax can develop due to a congenital defect in the diaphragm. We present a case of a spontaneous massive left-sided pneumothorax that occurred during laparoscopy-assisted gastrectomy, because of an escape of intraperitoneal CO2 gas, under pressure, into the pleural cavity through a congenital defect in the esophageal hiatus of the left diaphragm. This was confirmed on intraoperative chest radiography and laparoscopic inspection. This CO2 pneumothorax caused tolerable hemodynamic and respiratory consequences, and was rapidly reversible after release of the pneumoperitoneum. Thus, a conservative approach was adopted, and the remainder of the surgery was completed, laparoscopically. Due to the high solubility of CO2 gas and the extra-pulmonary mechanism, CO2 pneumothorax with otherwise hemodynamically stable conditions can be managed by conservative modalities, avoiding unnecessary chest tube insertion or conversion to an open procedure.
金德慶 고려대학교 의과대학 1977 고려대 의대 잡지 Vol.14 No.1
As a antenatal care, periodical routine blood and urine examination and checking blood pressure is a important tool for early detecting preeclampsia, eclamsia or toxemia in pregnant women. It is well documented that the babys born from toxemic mother is one of the high risk infant because of preterm or low birth weight for gestational age. Author attempted to determine the relation of maternal urine findings to the birth weight, 963 newborn infants were studied during the period of Jan. 1, 1974 to June 30, 1976. The results obtained were as follows: 1. Among 1685 pregnant women, positive proteinuria was found in 954 cases, 56.6%, and 70.8% for toxemic mother. 2. Incidence of toxemia was 19.8% for positive proteinuria group and 10.67% for negative group. 3. Overall average birth weight of infants was 3.25±0.58㎏ in male, 3.14±0.59㎏ in female. Infants born from mother with positive proteinuria was 3.28±0.66㎏ in male, 3.17±0.63㎏ in female, while birth weight of proteinuria negative mother's baby had 3.17±0.63㎏ in male, 3.11±0.62㎏ in female. 4. There was no significant difference between infant's birth weight and degree of maternal proteinuria with age, parity of mother of gestational age. 5. Cesarean section rate was slightly increased in baby born from mother with positive proteinuria mother (6.4%). 6. There was no correlation between twin pregnancy and maternal proteinuria. 7. Low Apgar score (0-4) was more frequently seen in the baby born from mother with positive proteinuria than without proteinuria. 8. The fetal death rate was slightly higher in baby born from mother with proteinuria but was not significant statistically.
다중셀 환경에서 OFDMA/CDM 기반 셀룰라 시스템의 성능 개선
김덕경,류제훈,정부섭,Kim, Duk-Kyung,Ryu, Je-Hun,Jeong, Bu-Seop 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.7a
본 논문에서는 사용자를 주파수로 구분하고 데이터를 주파수 영역 확산으로 다중화하는 OFDMA/CDM 기반 셀룰라 시스템을 제안하다. 셀 구분을 위해 랜덤코드를 이용하며, 시스템 성능 향상을 위하여 전치등화를 적용한다. 송신전력이 제한된 다중셀 환경에 적합한 전치등화 방법과 효율적인 전력할당 방식을 제안한다. 다중셀 환경에서 각 등화방법 및 전력할당 방식에 따른 성능을 분석하곤 특히 셀 중심으로부터의 거리에 따른 성능 변화, 다중화 데이터 개수에 따른 성능 분석을 통괘 다중셀 환검 적용 타당성을 분석한다. 끝으로 시간지연에 따른 성능저하를 전치와 후치 등화를 모두 사용한 전/후치등화를 적용하여 줄일 수 있음을 보인다. In this paper, we propose an OFDMA/CDM-based cellular system, which accommodates multiple users in frequency-domain and multiplexes user data with frequency-domain spreading. The proposed system utilizes random codes to discriminate cells and adopts the pre-equalization to enhance the performance. For cellular applications, a number of pre-equalization techniques are compared and an efficient power allocation scheme is suggested with a transmit power constraint. Especially, the validity of OFDMA/CDM based cellular system is investigated, by comparing the performance for varying the number of multiplexed data symbols at different locations. Finally the pre/post-equalization is proposed to reduce the performance degradation caused by time delay.
김덕경,장성환,이해원,윤익진,김지영 대한마취통증의학회 2010 Anesthesia and pain medicine Vol.5 No.3
Background:Because liver transplantation (LT) essentially accompanies the deterioration, total absence, and recovery of hepatic function, and donor hepatectomy (DH) is performed in otherwise healthy individuals, we planned to compare the postoperative pain in patients undergoing LT, DH, and a major hepatectomy (MH) for a tumor. Methods:Postoperatively, all patients were permitted to administer patient-controlled fentanyl with a standard dosing regimen. Breakthrough pain was treated with a 25μg fentanyl bolus. Verbal rating scale (VRS) pain scores at rest (static) and during coughing (dynamic), total fentanyl consumption, and side effects were assessed at 2, 4, 6, 12, 24, and 48 h postoperatively. Results:Thirty patients (11, 10, and 9 in the MH, DH, and LT groups, respectively) were included in the study. The LT group showed a lower static pain VRS score 2, 4, 6, and 12 h postoperatively, and a lower dynamic pain VRS score 12, 24, and 48 h postoperatively than the MH group. Total fentanyl consumption was significantly less in the LT group than the other two groups throughout the study period. Postoperative nausea and vomiting were reduced significantly in the LT group than in the other two groups. No significant differences in postoperative fentanyl requirement, or static and dynamic pain, existed between the MH and DH groups. Conclusions:LT patients experienced less static pain during the early postoperative period and less dynamic pain during the late postoperative period than MH patients. DH patients had similar pain intensity and postoperative fentanyl requirements to the MH patients.
김덕경 이화여자대학교 체육대학 보건체육연구소 1991 이화체육논집 Vol.4 No.-
The present expriment investigated the effect of post-KR interval on motor skill learning and the optimal length of interval for performing ballistic timing task. To insure that, three levels of post-KR interval ( 1sec, 5 sec and 10 sec) was used, and 30 subject was assigned to each exprimental group randomly. Each subject completed 100 KR acquisition trials and 20 No-KR transfer trials. Results indicated that condition involving 10 sec post-KR interval leaded poorer acquisition than 1 sec interval, but facilitated novel response transfer contray to condition of 1 sec post-KR interval. However, three conditions of expriment were not significant differences statistically. As thease results, it cannot be confirmed that 10 sec interval is the optimal length for timing task.