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조기분만진통 임산부에서 양수 tumor necrosis factor-α 와 조직학적 융모양막염 및 선천성 패혈증과의 관련성에 관한 연구
박교훈(Kyo Hoon Park),윤보현(Bo Hyun Yoon),전중관(Jong Kwan Jun),박중신(Joong Shin Park),김길자(Gil Ja Kim),이홍균(Hong Kyoon Lee),신희철(Hee Chul Syn) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.5
N/A Objective : Our purposes were (1) to determine whether amniotic fluid concentrations of tumor necrosis factor-α are of value in the diagnosis of histologic chorioamnionitis of preterm placenta and in the prediction of congenital sepsis in patients with preterm labor and intact membranes and (2) to compare the diagnostic performance of placental histologic finding and amniotic fluid culture with that of amniotic fluid tumor necrosis factor-α for this outcome variable. Methods : The relations among placental histologic finding, perinatal outcome, amniotic fluid culture, and amniotic fluid tumor necrosis factor-α concentrations were examined in 61 consecutive patients with preterm labor and intact membranes who delivered preterm neonates within 72 hours after transabdominal amniocentesis. Tumor necrosis factor-α was determined by enzyme-linked immunosorbent assays. Mann-Whitney U test, Fisher's exact test, receiver-operator characteristic curve, and multiple logistic regression were used for analysis. Results : 1) Women with acute histologic chorioamnionitis had significantly higher median amniotic fluid tumor necrosis factor-α concentrations than those without histologic chorioamnionitis (median 83.2 pg/ml, range 1.4 to 7241 pg/ml vs median 1.6 pg/ml, range 0 to 59.9 pg/ml, p <0.0001). Amniotic fluid tumor necrosis factor-α concentrations ≥4.6 pg/ml had a sensitivity of 88% (28/32) and specificity of 80% (23/29) in the diagnosis of acute histologic chorioamnionitis. 2) Amniotic fluid concentrations of tumor necrosis factor-α were significantly higher in neonates with congenital sepsis than in those without congenital sepsis (median 227.5 pg/ml, range 1.2 to 7241 pg/ml vs median 3.8 pg/ml, range 0 to 735 pg/ml, p <0.0005). Amniotic fluid tumor necrosis factor-α concentrations ≥41 pg/ml had a sensitivity of 82% (23/29) and specificity of 79% (38/48) in the prediction of congenital sepsis. 3) Multiple logistic regression indicated that elevated amniotic fluid tumor necrosis factor-α (≥41 pg/ml) was the only independent predictor of congenital sepsis (odd ratio 12.9, 95% confidence interval 1.3 to 125.3, p <0.05) after correction for known confounding variables [i.e., low gestational age at birth (≤32 weeks), positive amniotic fluid culture, histologic or clinical chorioamnionitis, low Apgar score (<7)]. Conclusion : Test of amniotic fluid tumor necrosis factor-α is of value in the antenatal diagnosis of histologic chorioamnionitis and congenital sepsis in patients with preterm labor and intact membranes. Amniotic fluid tumor necrosis factor-α is a better independent predictor of congenital sepsis than placental histologic finding or amniotic fluid culture.
호우시 구릉지 완사면에 발달된 ‘U자골’ 곡두부에서의 지중수 거동
박종관(Jong-Kwan Park),조경민(Kyong-Min Cho),양해근(Heakun Yang),마루이 아츠나오(Marui Astunao) 대한지리학회 2006 대한지리학회지 Vol.41 No.6
본 연구는 산림이 잘 보존되고 있는 경기도 구리시 동구릉 지역 내의 완사면 곡두부 지점에서의 호우시 지중수 유출과 지형형성 프로세스를 규명하고자 실시되었다. 본 연구 결과‘U자골’곡두부의 경우 20㎜ 이하의 강우시에는 지하수위 변화가 거의 없었으나 곡두사면과 그 상부 지점에서는 총강우량과 강우강도에 의해서 지하수위가 크게 변화하고 있는 것으로 나타났으며, 그 변동 폭은 선행강우량과 그 경과시간, 그리고 강우지속시간과 밀접한 관계가 있는 것으로 확인되었다. 이러한 현상에 영향을 미치는 요인으로는 강우시 형성된 사면의 유출특성, 즉 지하수위 상승에 기인한 복귀류 발생과‘U자골’곡두사면을 따라 빠르게 흐르는 측방류를 들 수 있으며 이러한 지중수의 흐름은‘U자골’지형발달에 중대한 영향을 미친다. 사면 곡두부 지형은 지중수에 의해 변형되고 있음을 알 수 있다. The purpose of this study is to clarify the behavior of subsurface water flow during rainfall on the hillslope in the Dongguneung experimental basin. As a result of the study, the following conclusions were obtained. Under the total rainfall of 20㎜, there were no groundwater level changes. However, it was found that total rainfall amount and rainfall intensity were important factors to change groundwater level in hilly slope. Also the rainfall duration and preexisted rainfall amount were important factors to change it on the head hollow. To analyze the modification of ‘Ushaped Gol’ landform, the pattern of return flow and through flow have to check during storm events. The microgeomorphic change of head hollow is based on the pattern of subsurface water flow.
박인서(In Suh Park),이상인(Sang In Lee),이관식(Kwan Sik Lee),박효진(Hyo Jin Park),신준한(Joon Han Shin),최홍재(Heung Jai Choi),권선옥(Seon Og Kweon),정준표(Jun Pyo jeong) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.2
Percutaneous endoscopic gastromy (PEG) and percutaneous endoscopic jejunostomy (PEJ) are used commonly for enteral feeding. Rut there were some reports of using PEG as an alternative to naso-gastrointestinal tube for decompression in parients with mechanical obstruction, particularly obstraction with malignancies involving the upper gastrointesrinal tract. Palliation is usually achieved by the placement of a nasogastric or nasointestinal tube. Hower these tubes tend to have some disadvantages which can be overcome with drainage PEG. In our experience, a 65 years old male patiert with pyloric obstruction due to advanced gastric cancer was successfly decompressed by drainage PEG. Thus, we present this case with supporting literatures.
하이브리드 인공지능 제어기에 의한 유도전동기의 고성능 제어
박병상(Byung-Sang Park),최정식(Jung-Sik Choi),고재섭(Jae-Sub Ko),이정호(Jung-Ho Lee),김종관(Jong-Kwan Kim),박기태(Ki-Tae Park),정동화(Dong-Hwa Chung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper is proposed hybrid artificial intelligent controller for high performance of induction motor drive. The design of this algorithm based on fuzzy-neural network controller that is implemented using fuzzy control and neural network. The control performance of the hybrid artificial intelligent controller is evaluated by analysis for various operating conditions. The results of experiment prove that the proposed control system has strong high performance and robustness to parameter variation, and steady-state accuracy and transient response.
우랄-시베리아 자원지대와 북극항로 연계된 러시아 북극 철도회랑 개발정책 연구
박종관 ( Park Jong Kwan ) 배재대학교 한국-시베리아센터 2021 한국시베리아연구 Vol.25 No.1
본 연구의 목표는 러시아 북극권의 지경학 및 지정학적 가치에 대한 다차원적이고 포괄적 분석을 통해 러시아 우랄-시베리아 자원지대를 연결하는 북극 철도회랑 개발 정책 연구다. 러시아 북극권은 바다를 통한 북극항로 뿐만이 아니라 내륙의 자원지대와의 연결 문제가 자원 개발과 수송이라는 측면에서 매우 중요하다. 북극의 내륙철도 교통망에 대한 연구의 필요성을 추동하는 핵심적 요인은 지구온난화현상이다. 지구온난화는 글로벌 생태계를 위협하는 재앙이지만, 북극항로의 상업화라는 새로운 자원개발지의 탄생뿐만이 아니라 전 세계 무역 형태의 변화와 물류 혁명을 예고하며 개발에 제한적이던 북극의 광물자원 개발을 촉진하는 긍정적인 측면이 있다. 따라서 본 연구는 러시아 북극전략인 「러시아 교통전략 2030」, 「러시아 철도발전 전략 2030」 연구를 근간으로 하여 북극연구의 전통적 이슈인 탄화수소 에너지 자원, 광물자원, 거점항구 및 항만 인프라 구축의 북방항로를 남-북, 동-서 노선의 연결인 북극철도와의 연결 연구로서, 특히 러시아 우랄-시베리아 자원지대와 북극권의 항로, 해운 항만의 인프라, 자원개발 지대와의 북극 철도회랑 개발 연구다. The objective of this study is to examine the Northern Latitudinal Railway development policy connecting the Ural-Siberian resource rent by performing a multidimensional and comprehensive analysis of geoeconomic and geopolitical values in the Russian Arctic Circle. Besides the Arctic seaway, the connection with the inland resource rent is crucial for the Russian Arctic Circle because of resource development and transportation. Global warming is the core factor that encourages the necessity of research on inland railway traffic networks in the Arctic. Although global warming is a disaster that threatens the global ecosystem, it has some positive aspects like the commercialization of the Arctic seaway for a new resource area. Also, global warming foretells changes in the global trading methods and logistics innovation, thus facilitating the development of mineral resources in the Arctic, which used to be limited. Accordingly, this study examines the Arctic seaway as a connection with South-North and East-West routes of the Arctic Railway to discuss the traditional issues of Arctic studies like hydrocarbon energy resources, mineral resources, hub ports, and harbor infrastructures based on the 2030 Russian Transport Strategy and the 2030 Russian Railway Development Strategy. This study especially focuses on the Northern Latitudinal Railway that connects the Ural-Siberian resource rent in Russia, Arctic seaway, harbor infrastructures, and resource development areas.
정지궤도위성의 휠모멘텀 제어에 의해 발생되는 3축 궤도병진 속도에 관한 분석
박영웅(Young-Woong Park),박근주(Keun-Joo Park),김대관(Dae-Kwan Kim),양군호(Koon-Ho Yang) 한국항공우주연구원 2008 항공우주기술 Vol.7 No.2
본 연구에서는 통신해양기상위성 형상을 갖고 휠모멘텀 제어를 위해 추력기를 사용할 때 발생되는 3축 궤도병진 운동에 관하여 분석하였다. 또한, 통신해양기상위성은 롤/요 휠모멘텀 제어를 위해 사용되는 추력기의 성능 감소를 균일하게 하기 위해 주기적으로 조합군을 변경하도록 설계하였기 때문에 조합군 변경시에 발생되는 3축 궤도병진 속도 차이가 발생하게 된다. 따라서 본 연구에서는 COMS 추력기 조합군 변경시 발생되는 3축 궤도병진 속도를 최적화하였다. In this study, triaxial velocity is analyzed for COMS(Communication, Ocean and Meteorological Satellite) configuration, which is generated when thrusters are used to dump wheel momentum. Since COMS is designed to periodically mange the thruster set in order to uniformly decrease the performance of thrusters, triaxial velocity would be different during the change of thruster set. So, the triaxial velocity generated due to the change of thruster set is optimized.