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항공 우주 해상 : 시뮬레이터를 이용한 태안비행장 Curved Approach에 대한 고찰
구본수 ( Bon Soo Koo ),전향식 ( Hyang Sig Jun ),정명숙 ( Myeong Sook Jung ),박수복 ( Soo Bog Park ),홍승범 ( Seung Beom Hong ),홍교영 ( Gyo Young Hong ) 한국항행학회 2014 韓國航行學會論文誌 Vol.18 No.4
현재 사용 중인 계기착륙장치(ILS)는 시스템 특성상 동시에 다수의 입항하는 항공기가 사용하기 어렵고, 활주로 방향별로 장비들이 설치되어야 한다. 또한 착륙하는 항공기들이 일정한 구역에서 단일 비행경로만으로 착륙절차가 구성되어야 한다는 한계점이 있다. 이에 항공 교통량이 증가하게 된다면 입항하는 항공기들의 체공 시간이 더욱 증가하게 될 것이다. 이러한 한계점을 보완하기 위해 GNSS를 이용한 착륙시설로 GBAS가 개발 되었다. 본 논문에서는 비행시험 전 시뮬레이터를 이용하여 태안 비행장에서 실제 사용 하고 있는 항공기 착륙절차와 Curved approach를 이용한 절차를 비교 하였다. 비교 결과 Curved approach 절차를 이용하게 되면 기존절차보다 비행시간이 감소되어 연료 및 소음공역회피 등과 같은 효과가 일어 날 수 있을 것으로 판단된다. Current ILS is difficult for the many aircraft to access to the system at the same time because of it`s system. And the equipments should be installed at the direction of every runway. Also, There is limitation that landing procedures must be have of only ILS single course when the aircraft land on the ground. hereupon, The more air traffic exist, the longer delay time of flight be. GBAS using the GNSS has been developed to overcome those limitations. Before flight test in Teean airport, this paper compares the taean approach procedure and curved approach procedure by using the simulator. Comparison study shows that curved approach procedure takes less flight time, low fuel consumpsion and make it possible to avoid noise airspace more than original procedure.
Koo, Bon-Kwon,Waseda, Katsuhisa,Kang, Hyun-Jae,Kim, Hyo-Soo,Nam, Chang-Wook,Hur, Seung-Ho,Kim, Jung-Sun,Choi, Donghoon,Jang, Yangsoo,Hahn, Joo-Yong,Gwon, Hyeon-Cheol,Yoon, Myeong-Ho,Tahk, Seung-Jea,Ch Ovid Technologies Wolters Kluwer -American Heart A 2010 Circulation. Cardiovascular interventions Vol.3 No.2
<P>BACKGROUND: We sought to investigate the mechanism of geometric changes after main branch (MB) stent implantation and to identify the predictors of functionally significant 'jailed' side branch (SB) lesions. METHODS AND RESULTS: Seventy-seven patients with bifurcation lesions were prospectively enrolled from 8 centers. MB intravascular ultrasound was performed before and after MB stent implantation, and fractional flow reserve was measured in the jailed SB. The vessel volume index of both the proximal and distal MB was increased after stent implantation. The plaque volume index decreased in the proximal MB (9.1+/-3.0 to 8.4+/-2.4 mm(3)/mm, P=0.001), implicating plaque shift, but not in the distal MB (5.4+/-1.8 to 5.3+/-1.7 mm(3)/mm, P=0.227), implicating carina shifting to account for the change in vessel size (N=56). The mean SB fractional flow reserve was 0.71+/-0.20 (N=68) and 43% of the lesions were functionally significant. Binary logistic-regression analysis revealed that preintervention % diameter stenosis of the SB (odds ratio=1.05; 95% CI, 1.01 to 1.09) and the MB minimum lumen diameter located distal to the SB ostium (odds ratio=3.86; 95% CI, 1.03 to 14.43) were independent predictors of functionally significant SB jailing. In patients with > or =75% stenosis and Thrombolysis In Myocardial Infarction grade 3 flow in the SB, no difference in post-stent angiographic and intravascular ultrasound parameters was found between SB lesions with and without functional significance. CONCLUSIONS: Both plaque shift from the MB and carina shift contribute to the creation/aggravation of an SB ostial lesion after MB stent implantation. Anatomic evaluation does not reliably predict the functional significance of a jailed SB stenosis.</P>
Relationship of Hemodynamic Indices and Prognosis in Patients with Liver Cirrhosis
( Soon Koo Baik ),( Myeong Gwan Jee ),( Phil Ho Jeong ),( Jae Woo Kim ),( Sang Won Ji ),( Hyun Soo Kim ),( Dong Ki Lee ),( Sang Ok Kwon ),( Young Ju Kim ),( Joong Wha Park ),( Sei Jin Chang ) 대한내과학회 2004 The Korean Journal of Internal Medicine Vol.19 No.3
간경변증 환자에서 도플러를 이용한 복부혈역학검사값의 초음파 장비 간 차이
지명관 ( Myeong Gwan Jee ),백순구 ( Soon Koo Baik ),박동훈 ( Dong Hun Park ),김문영 ( Moon Young Kim ),임대욱 ( Dae Wook Rhim ),조기원 ( Ki Won Jo ),홍진헌 ( Jin Hon Hong ),김재우 ( Jae Wook Kim ),김현수 ( Hyun Soo Kim ),권상옥 ( 대한간학회 2006 Clinical and Molecular Hepatology(대한간학회지) Vol.12 No.4
Jeong Myeong Kim,An-Sung Roh,Seung-Chul Choi,Eun-Jeong Kim,Moon-Tae Choi,Byung-Koo Ahn,Sun-Kuk Kim,Young-Han Lee,Jae-Ho Joa,Seong-Soo Kang,Shin Ae Lee,Jae-Hyung Ahn,Jaekyeong Song,Hang-Yeon Weon 한국미생물학회 2016 The journal of microbiology Vol.54 No.12
Soil microorganisms play an essential role in soil ecosystem processes such as organic matter decomposition, nutrient cycling, and plant nutrient availability. The land use for greenhouse cultivation has been increasing continuously, which involves an intensive input of agricultural materials to enhance productivity; however, relatively little is known about bacterial communities in greenhouse soils. To assess the effects of environmental factors on the soil bacterial diversity and community composition, a total of 187 greenhouse soil samples collected across Korea were subjected to bacterial 16S rRNA gene pyrosequencing analysis. A total of 11,865 operational taxonomic units at a 97% similarity cutoff level were detected from 847,560 sequences. Among nine soil factors evaluated; pH, electrical conductivity (EC), exchangeable cations (Ca2+, Mg2+, Na+, and K+), available P2O5, organic matter, and NO3-N, soil pH was most strongly correlated with bacterial richness (polynomial regression, pH: R2 = 0.1683, P < 0.001) and diversity (pH: R2 = 0.1765, P < 0.001). Community dissimilarities (Bray-Curtis distance) were positively correlated with Euclidean distance for pH and EC (Mantel test, pH: r = 0.2672, P < 0.001; EC: r = 0.1473, P < 0.001). Among dominant phyla (> 1%), the relative abundances of Proteobacteria, Gemmatimonadetes, Acidobacteria, Bacteroidetes, Chloroflexi, and Planctomycetes were also more strongly correlated with pH and EC values, compared with other soil cation contents, such as Ca2+, Mg2+, Na+, and K+. Our results suggest that, despite the heterogeneity of various environmental variables, the bacterial communities of the intensively cultivated greenhouse soils were particularly influenced by soil pH and EC. These findings therefore shed light on the soil microbial ecology of greenhouse cultivation, which should be helpful for devising effective management strategies to enhance soil microbial diversity and improving crop productivity.
Kim, Myoung Soo,Koo, Il Gyo,Choi, Myeong Yeol,Jung, Jae‐,Chul,Eldali, Fathala,Lee, Jae Koo,Collins, George J. WILEY‐VCH Verlag 2012 Plasma Processes and Polymers Vol.9 No.3
<P><B>Abstract</B></P><P>Radio frequency (RF) driven hybrid gas–water plasma for tooth whitening was developed and the plasma chemical reactions with de‐ionized (DI) water were studied. Plasma operating conditions, such as RF input power and argon flow rate were correlated with plasma lengths. The operation of hybrid gas–water plasma changed both the electrical conductivity and pH concentration of the DI water. OH and H<SUB>2</SUB>O<SUB>2</SUB> densities were measured to determine the dominant species generated by plasma. The major chemical reaction pathways and known rate constants are given in support of the analysis of major chemical reaction pathways. Finally, we demonstrated that the hybrid gas–water configuration achieved porcine tooth whitening.</P>
간외담도 결석의 내시경적 치료 성적과 이에 영향을 미치는 요인
백순구(Soon Koo Baik),김준명(Jun Myeong Kim),김광현(Kwang Hyun Kim),정연수(Yon Soo Jeong),이동기(Dong Ki Lee),권상옥(Sang Ok Kwon) 대한내과학회 1998 대한내과학회지 Vol.54 No.4
N/A Objectives : Developments in endoscopic technique and equipments have improved duct clearance rate in patients with extrahepatic bile duct(EHBD) stone. In this study, we reviewed our experience in extracting EHBD stones with standard and more advanced technique and equipments such as mechanical lithotripsy and extracorporeal shock wave lithotripsy. Aims of this study were to determine the overall success rate of endoscopic extracting for EHRD stone, to identify risk factors for failed duct clearance at initial and final therapeutic ERCP. Methods : We retrospectively reviewed 214 consecutive patients who underwent Endoscopic Retrograde Cholangiopancreatography(ERCP) for EHBD stone over 45 months period. Factors evaluated for failed duct clearance included stone size, stone number, stone shape, concomitant stone of gallbladder and intrahepatic duct, presence of distal bile duct stricture, periampullary diverticula(PAD), Billroth-II gastrojejunostomy, and sepsis at admission. Results: The overall success rate of endoscopic treatment for EHBD stone was 93.5% (200/214). The causes of failed duct clearance were failed endoscopic sphincterotomy in 5/214 (2.3%), technical failure of extracting stone in 5/214(2.3%), and aggravation of acute cholecystitis between therapeutic endoscopic sessions in 4/214(1.9%), Risk factors for failed duct clearance with endoscopic extraction of EHBD stone were size and shape of the stone, concomitant stone of gallbladder and intrahepatic duct, and stricture of distal common bile duct. The duct clearance rate with initial therapeutic ERCP was 56.5%(121/200). Risk factors for failed duct clearance with initial therapeutic ERCP were size, shape and number of stone, and sepsis at admission. The complications of endoscopic treatment for EHBD stone were major bleeding in 5/200 (2.5%), pancreatitis in 18/200 (9.0%), but there was no perforation. Conclusion: Eventhough risk for failure of endoscopic treatment for EHBD stone were giant or piston shaped stone, concomitant stone of gallbladder and intrahepatic duct, and stricture of distal common bile duct, we conclude that endoscopic treatment for EHBD stone is safe and effective treatment modality, and choice of treatment.