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권수인 대한외상학회 1996 大韓外傷學會誌 Vol.9 No.1
Injury is the leadings causes of death for all children more than 1 year of age. The Liver is the second most commonly injured organ during childhood and nonoperative treatment is one of the recent change in the management of blunt hepatic injury. To elucidate the criteria for nonoperative management, 18 pediatric hepatic injury patients were selected during the period between January 1988 and December 1994 and divided into two groups, one of which consists of 17 patients that were treated operatively(op group) and the other consists of 11 patients that were treated nonoperatively(nonop group). A retrospective clinical analysis was performed including their Grade of liver injuries, vital signs on admission, amount of blood transfusions and fluid infusions for resuscitation, and serial Pediatric Trauma Scores(PTS). The results are as follow: 1) Average age of op group was 8.3 years of age and age group between 5 and 10 year were most frequent(41.2%) in nonop group, average age was 8.89 years of age and age groups between 5 and 10 and between 10 to 16 years were most frequent(36.4%) 2) Grade Ⅲ and Grade Ⅳ liver injury were most common in op group (35.3%, respectively), but Grade Ⅱ liver injury was most common in nonop group(63.6%). 3) The presence of shock on admission was 82.3% in op group and 36.4% in nonop group and there was statistically significant difference between them(p-value <0.05). 4) The amount of whole blood transfused during initial resuscitation in op and nonop group were 48.17 + 16.94ml/kg and 23.61 + 9.64ml/kg, respectively. A statistically significant difference was observed between them(p-value <0.05). The amount of infused colloid solutions in op and nonop groups were 29.78 + 8.77ml/kg, respectively and their difference was significant(p-value <0.05). 5) The Pediatric Trauma Score(PTS) checked on arrival to emergency department, 2 hour, 4 hour, and 6 hour after admission, was 1.83 + 2.04, 3.29 + 2.56, 6.73 +2.55 and 6.78 + 2.18 respectively, in op group, and 5.57 + 2.26, 7.38 + 2.14, 8.11 + 1.69 and 8.75 + 1.09 each, in nonop group. There were statistically significant differences between two groups (p-value <0.05) in PTS checked on arrival and 2 hour after admission. Conclusively, patients' hemodynamic status, especially presence of shock and PTS checked on arrived and checked after 2 hour's resuscitation could be regarded as an important factor to choose the treatment methods for pediatric liver injury patients, operatively or nonopertively.
와동 발생기 높이 변화에 대한 경계층 내의 유동장과 온도장에 관한 실험적 연구
권수인,양장식,이기백,Gwon, Su-In,Yang, Jang-Sik,Lee, Gi-Baek 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.1
The effects of the interaction between the flow and temperature field and a boundary layer due to a variety of the height of a vortex generator are experimentally investigated. The test facility consists of a boundary-layer wind tunnel with the vortex generator protruding from the bottom surface. In order to control the strength of the longitudinal vortices, the angle of attack and the spacing distance of the vortex generator are 20 degree and 40 mm, respectively. The height of the vortex generator (H) is 15 mm, 20 mm and 30 mm and the cord length of it is 50 mm. Three-component mean velocity measurements are made using a 5-hole probe system and the surface temperature distribution is measured by the hue capturing method using thermochromatic liquid crystals. By using the method mentioned above, the following conclusions are obtained from the present experiment. The boundary layer is thinned in the downwash region where the strong downflow and the lateral outflow of the boundary layer fluid occur and thickened in the upwash re,3ion where the longitudinal vortex sweeps low momentum fluid away from the bottom surface. In case that the height of the vortex generator increases, the averaged circulation and the maximum vorticity of the vortex pair decrease. The contours of the non-dimensional temperature show the similar trends fur all the cases (H=15 mm, 20 mm and 30 mm). The peak augmentation of the distribution of the local non-dimensional temperature occurs in the downwash region near the point of minimum boundary-layer thickness.
권수인,Kwon, Soo-In 대한소아외과학회 1998 소아외과 Vol.4 No.2
With the recent advances in instruments and techniques, laparoscopic procedure have extended to neonates with congenital anomalies. The author reports a 6-day-old boy with Hirschsprung's disease, treated successfully by the laparoscopic endorectall pull-through procedure. The technique and its potential role in the treatment of Hirschsprung's disease are described. One camera port and three working ports were used for access to the peritoneal cavity. The descending and sigmoid colon were mobilized laparoscopically. The submucosal dissection was done transanally. The colon was then pulled down in continuity, divided above the transition zone, and secured to the anal mucosa about 10 mm above the pectinate line. Author concluded that endorectal pull-through can be performed safety with the laparoscope.
수소 정제 시스템의 건조 타워 열전달 해석을 위한 응용 프로그램 코드 개발
권수인,진병석,최경민 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.4
The purity of hydrogen finally purified in the hydrogen purification process system is greatly influenced by the uniformity of the purification temperature of the dry tower. A in-house code that can be easily used by field designers has been developed to predict the capacity of the appropriate heat source and the time to reach the temperature of the dry tower. A code was developed to predict unsteady heat transfer using Visual Basic for Applications. To verify the developed code, a grid independence test was performed, and finally, calculations were performed for two cases. In the first case, the time for the temperature of the heater jacket to reach 360℃ was about 1,400 seconds when the supply heat source was 1,000 W. And in the second case, the time for the temperature of the heater jacket to reach 360℃ was about 710 seconds when the supply heat source was 2,000 W. It was confirmed that the developed code well describes the actual test data of the regeneration process of adsorption and desorption, and it is judged that the code developed in the design process of various capacity systems will be effectively applied to the heat capacity calculation in the future.