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AHP를 활용한 철도교통 분야 R&D 실용화 촉진점검 체크리스트 개발
김태구 ( Kim Tae-gu ),김동희 ( Kim Dong-hee ),이덕주 ( Lee Doek-joo ),김경택 ( Kim Kyung-taek ),문새다슬 ( Moon Saedasul ) 한국경영공학회 2017 한국경영공학회지 Vol.22 No.1
R&D projects for railway transportation in Korea have public nature and have been planned and motivated by government. Though a variety of previous studies on this topic covered different issues such as performance evaluation and policy suggestion, there is vacancy in methodologies to manage ongoing R&D projects for successful commercialization. In this study, a checklist to promote commercialization of R&D for Railway transportation and a procedure for its application are proposed. We developed the extant checklist by analyzing and restructuring it and utilized AHP to obtain weights for each checklist item and each stage of commercialization. The proposed checklist and its application procedure are expected to contribute to review and management of ongoing R&D projects.
Photoluminescence study of InAs quantum dots with bimodal size distribution
Sang Jun Lee,Sam Kyu Noh,이주인,Jung Woo Choe,Moon Doek Kim,Se Kyung Kang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
We have investigated photoluminescence (PL) spectra taken from a series of self-assembled InAs/GaAs quantum-dot (QD) heterostructures with different InAs coverages by performing excitation-power and temperature dependence measurements. The PL spectra exhibit a well-defined doublet-like QD peak with invariable energy positions regardless of the coverage attributed to a bimodal size distribution of small and large QDs. The power-dependent PL spectra show that the high-energy peak is composed of two contributions, one from the excited state of large QDs and the other from the ground state of small QDs, and the power dependence of high-energy peak becomes stronger with increasing the amount of InAs. This indicates that, in as-grown InAs QD ensembles grown under optimum growth conditions with appropriate InAs coverages, there can exist a specic bimodal size distribution consisting of large and small QD groups whose sizes are fixed, but whose numbers vary with the amount of InAs.
봉형근(Hyung Keun Bong),이영흥(Young Heung Lee),조영덕(Young Doek Cho),김진오(Jin Oh KIm),조주영(Joo Young Cho),김연수(Yun Soo Kim),이준성(Jun Seong Lee),이문성(Moon Sung Lee),황성규(Seong Gyu Hwang),심찬섭(Chan Sup Shim) 대한내과학회 1998 대한내과학회지 Vol.54 No.6
N/A Objective: Intrahepatic stones provide a quite different spectrum of problems f by surgeons in the tem hemisphere. Although unilateral left intrahepatic stones have been treated by left hepatic lobectomy, bilateral or right intrahepatic stones can be even more troublesome because they frequently cannot be completely removed by conventional surgical stone extraction procedure. Recently, the use of a flexible fiberoptic choledochoscope, electrohydraulic lithotriptor (EHL) and dilators make it possible to completely remove intrahepatic stones by nonsurgi- cal procedures in the majority of c Methods: During the last 5 years, we treated intrahepatic stones in 114 patients with a fiberoptic choledochoscope, EHL and dilators via percutaneous transhepatic route. For construction of percutaneous transhepatic routes, we punctured intrahepatic ducts by ultrasonographic guidance and then dilated the tracts by PTBD set (Nipro Co., Japan) under fluoroscopic guidance. Choledochoscopy were performed at 4-6 weeks later, and Dormina basket, EHL, balloon or bougie dilators were used for removal of stones. Results: Success rates according to the locations of stones were 87.5% (14/16) in unilateral right intrahepatic stones, 92.9% (39/42) in unilateral left intrahepatic stones, and 89.3% (50/56) bilateral intrahepatic stones. Overall success rate was 90.4% (103/114). Causes of incomplete removal of the stones in our patients included the failure of construction or maintenance of percutaneous transhepatic routes in 4 cases, intrahepatic bile duct stricbm proximal to impacted stones in 3, acute ductal angulation in 2, and stones located at the very distal branches of intrahepatic ducts in 2 cases. Complications associated with the procedure were transient fever in 8 cases, severe hemobila in 2 cases and bihary perforation in 3 cases. Conclusion: These results suggest that gemutaneaus transhepatic choledochoscopic approach is a relatively safe and effective method for treatment of intrahepatic stones.
Astrocyte elevated gene-1 overexpression in hepatocellular carcinoma
Hae Il Jung,Taesung Ahn,Sang Ho Bae,Jun Chul Chung,Hyungjoo Kim,Susie Chin,Dongjun Jeong,Hyon Doek Cho,Moon Soo Lee,Hyung Chul Kim,Chang Ho Kim,Moo-Jun Baek 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.88 No.2
Purpose: Astrocyte elevated gene-1 (AEG-1) plays important roles in tumorigenesis such as proliferation, invasion, metastasis, angiogenesis, and chemoresistance. We examined the expression of AEG-1 in patients with hepatocellular carcinoma (HCC). Methods: Eighty-five samples were collected from patients with HCC who underwent surgery and were histopathologically confirmed to have HCC. Two independent pathologists, experienced in evaluating immunohistochemistry and blinded to the clinical outcomes of the patients, reviewed all samples. They determined AEG-1 expression semiquantitatively by assessing the percentage of positively stained immunoreactive cells and staining intensity. Clinicopathological data were analyzed in association with prognosis. Results: The association was estimated by univariate and multivariate analyses with Cox regression. Tumor size (hazard ratio [HR], 2.285; 95% confidence interval [CI], 1.175?4.447; P = 0.015), microvascular invasion (HR, 6.754; 95% CI, 1.631?27.965; P = 0.008), and AEG-1 expression (HR, 4.756; 95% CI, 1.697?13.329; P = 0.003) were independent prognostic factors for overall survival. Those for disease-free survival rate were tumor size (HR, 2.245; 95% CI, 1.282?3.933; P = 0.005) and AEG-1 expression (HR, 1.916; 95% CI, 1.035?3.545; P = 0.038). The cumulative 5-year survival and recurrence rates were 89.2% and 50.0% in the low-expressing group and 24.5% and 82.4% in the high-expressing group, respectively. Conclusion: The results suggest that AEG-1 overexpression could serve as a valuable prognostic marker in patients with HCC.