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Endoscopic ultrasound-guided choledochoduodenostomies with fully covered self-expandable metallic stents

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World Journal of Gastroenterology 2012年第32期18卷 4435-4440页

作者： Tae Jun Song Yil Sik Hyun Sang Soo Lee Do Hyun Park dong Wan Seo Sung koo Lee Myung-Hwan Kim Department of Internal Medicine Inje University Ilsan Paik HospitalKoyang 411-706South Korea Department of Internal Medicine University of Ulsan College of MedicineAsan Medical CenterSeoul 138-736South Korea

AIM:To investigate the long-term outcomes of endoscopic ultrasound-guided choledochoduodenostomy(EUS-CDS) with a fully covered self-expandable metallic stent(FCSEMS).METHODS:From April 2009 to August 2010,15 patients with distal malignant biliary obstructions who were candidates for alternative techniques for biliary decompression due to a failed endoscopic retrograde cholangiopancreatography(ERCP) were *** 15 patients consisted of 8 men and 7 women and had a median age of 61 years(range:30-91 years).The underlying causes of the distal malignant biliary obstruction were pancreatic cancer(n = 9),ampulla of Vater cancer(n = 2),renal cell carcinoma(n = 1),advanced gastric cancer(n = 1),lymphoma(n = 1),and duodenal cancer(n = 1).RESULTS:The technical success rate of EUS-CDS with an FCSEMS was 86.7%(13/15),and functional success was achieved in 100%(13/13) of those *** two patients,the EUS-CDS failed because an FCSEMS with a delivery device could not be passed into the common bile *** mean duration of stent patency was 264 *** adverse events developed in three patients(3/13,23.1%),including self-limited pneumoperitoneum in two patients and cholangitis requiring stent reposition in one *** the follow-up period(median:186 d,range:52-388 d),distal stent migration occurred in four patients(4/13,30.8%).In 3 patients,the FCSEMS could be reinserted through the existing choledochoduodenal fistula ***:EUS-CDS with an FCSEMS is technically feasible and can lead to effective palliation of distal malignant biliary obstructions after failed ERCP.

关键词： Bile duct obstruction Drainage Endosonography Self-expandable metallic stent Neoplasms

IPDDF:an improved precision dense descriptor based flow estimation

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CAAI Transactions on Intelligence Technology 2020年第1期5卷 49-54页

作者： Weiyong Eng Voonchet koo Tiensze Lim Faculty of Engineering and Technology Multimedia UniversityJalan Ayer Keroh Lama75450 MelakaMalaysia

Large displacement optical flow algorithms are generally categorised into descriptor-based matching and pixel-based ***-based approaches are robust to geometric variation,however they have inherent localisation precision limitation due to histogram *** work presents a novel method called improved precision dense descriptor flow(IPDDF).The authors introduce an additional pixel-based matching cost within an existing dense Daisy descriptor framework to improve the flow estimation ***-based features such as pixel colour and gradient are computed on top of the original descriptor in the authors’matching cost *** pixel-based cost only requires a light-weight pre-computation and can be adapted seamlessly into the matching cost *** framework is built based on the Daisy Filter Flow *** the framework,Daisy descriptor and a filter-based efficient flow inference technique,as well as a randomised fast patch match search algorithm,are *** the novel matching cost formulation,the framework enables efficiently solving dense correspondence field estimation in a high-dimensional search space,which includes scale and *** on various challenging image pairs demonstrate the proposed algorithm enhances flow estimation accuracy as well as generate a spatially coherent yet edge-aware flow field result efficiently.

关键词： estimation flow matching

Clinical applications of fractional flow reserve in bifurcation lesions

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Journal of Geriatric Cardiology 2012年第3期9卷 278-284页

作者： Sang Hyun Park Bon-Kwon koo Seoul National University College of Medicine I O1 Daehang-ro Chongno-gu Seoul 110-744 South Korea

Pereutaneous coronary intervention （PCI） for coronary bifurcation lesions has been associated with lower procedural success rates and worse clinical outcomes compared with PCI for simple coronary lesions. Angiographic evaluation alone is sometimes inaccurate and does not reflect the fimctional significance of bifurcation lesions. The fractional flow reserve （FFR） is an easily obtainable, reliable, and reproducible physiologic parameter. This parameter is epicardial lesion specific and reflects both degree of stenosis and the myocardial territory supplied by the specific artery. Recent studies have shown that FFR-guided provisional side branch intervention strategy for bifurcation lesions is feasible and effective and can reduce unnecessary complex interventions and related complications. However, an adequate understanding of coronary physiology and the pitfalls of FFR is essential to properly use FFR for PCI of complex bifurcation lesions.

关键词： Coronary stenosis Bifurcation lesion Physiology Fractional flow reserve

Improved block matching approach to fast disparity estimation

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1278-1285页

作者： Tao Tangfei Ja Choon koo Hyouk Ryeol Choi School of Mechanical Engineering Xi'an Jiaotong Univ. Xi'an 710049 P. R. China State Key Lab. for Manufacturing Systems Engineering Xi'an 710049 P. R. China School of Mechanical Engineering Sungkyunkwan Univ. Suwon Republic of Korea

An improved block matching approach to fast disparity estimation in machine vision applications is proposed, where the matching criterion is the sum of the absolute difference（SAD）.By evaluating the lower bounds, which become increasingly tighter for the matching criteria, the method tries to successively terminate unnecessary computations of the matching criteria between the reference block in one image and the ineligible candidate blocks in another *** also eliminates the ineligible blocks as early as possible, while ensuring the optimal disparity of each ***, the proposed method can further speed up the elimination of ineligible candidate blocks by efficiently using the continuous constraint of disparity to predict the initial disparity of each *** performance of the new algorithm is evaluated by carrying out a theoretical analysis, and by comparing its performance with the disparity estimation method based on the standard block *** results demonstrate that the proposed algorithm achieves a computational cost reduction of over 50.5% in comparision with the standard block matching method.

关键词： machine vision block matching disparity estimation sum of the absolute difference.

Endoscopic fibrin glue injection for closure of pancreatocutaneous fistula following transgastric endoscopic necrosectomy

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World Journal of Gastroenterology 2008年第39期14卷 6093-6095页

作者： Ji Woong Jang Do Hyun Park Sung-Hoon Moon Sang Soo Lee dong Wan Seo Sung koo Lee Myung-Hwan Kim Division of Gastroenterology Department of Internal MedicineUniversity of Ulsan College of MedicineAsan Medical CenterSeoul 138-736South Korea

Transgastric endoscopic necrosectomy has been recently introduced as the effective and alternative management of infected pancreatic necrosis and pancreatic abscess. However,up to 40% of patients who undergo endoscopic necrosectomy may need an additional percutaneous approach for subsequent peripancreatic fluid collection or non-resolution of pancreatic necrosis. This percutaneous approach may lead to persistent pancreatocutaneous fistula,which remains a serious problem and usually requires prolonged hospitalization,or even open-abdominal surgery. We describe the first case of pancreatocutaneous fistula and concomitant abdominal wall defect following transgastric endoscopic necrosectomy and percutaneous drainage,which were endoscopically closed with fibrin glue injection via the necrotic cavity.

关键词： Fibrin glue Pancreatocutaneous fistula Infected pancreatic necrosis Pancreatic abscess Endoscopic necrosectomy

Effects of Supercritical Environment on Hydrocarbon-fuel Injection

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Journal of Thermal Science 2017年第2期26卷 183-191页

作者： Bongchul Shin Dohun Kim Min Son Jaye koo Graduate School Korea Aerospace UniversityGoyangRepublic of Korea School of Aerospace and Mechanical Engineering Korea Aerospace UniversityGoyangRepublic of Korea

In this study, the effects of environment conditions on decane were investigated. Decane was injected in subcritical and supercritical ambient conditions. The visualization chamber was pressurized to 1.68 MPa by using nitrogen gas at a temperature of 653 K for subcritical ambient conditions. For supercritical ambient conditions, the visualization chamber was pressurized to 2.52 MPa by using helium at a temperature of 653 K. The decane injection in the pressurized chamber was visualized via a shadowgraph technique and gradient images were obtained by a post processing method. A large variation in density gradient was observed at jet interface in the case of subcritical injection in subcritical ambient conditions. Conversely, for supercritical injection in supercritical ambient conditions, a small density gradient was observed at the jet interface. In a manner similar to that observed in other cases, supercritical injection in subcritical ambient conditions differed from supercritical ambient conditions such as sphere shape liquid. Additionally, there were changes in the interface, and the supercritical injection core width was thicker than that in the subcritical injection. Furthermore, in cases with the same injection conditions, the change in the supercritical ambient normalized core width was smaller than the change in the subcritical ambient normalized core width owing to high specific heat at the supercritical injection and small phase change at the interface. Therefore, the interface was affected by the changing ambient condition. Given that the effect of changing the thermodynamic properties of propellants could be essential for a variable thrust rocket engine, the effects of the ambient conditions were investigated experimentally.

关键词： Decane Jet Subcritical Supercritical Visualization

Birthplace is not a determinant of colorectal adenomas

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World Journal of Gastroenterology 2014年第26期20卷 8606-8611页

作者： Fiona Tran Jenn Hian koo Department of Gastroenterology and Hepatology Liverpool Hospital Department of Gastroenterology The University of New South Wales

AIM: To examine the impact of the patient’s birthplace on the prevalence of colonic polyps and histopathological subtypes.

关键词： Ethnicity Polyps Adenomas Advanced adenomas Colorectal cancer

Improvement in the Adhesion Between Electrode of a SOFC and Ag Paste as a Current Collector by Au Deposition

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Journal of Materials Science & Technology 2015年第3期31卷 257-263页

作者： Sang koo Jeon Seung Hoon Nahm Oh Heon Kwon Department of Safety Engineering Pukyong National University Center for Energy Materials Metrology Korea Research Institute or Standards and Science

This paper reports the use of Au films to improve the performance of the stacked solid oxide fuel cell(SOFC) based on the characterization of the interface and the adhesion between the electrodes of the SOFCs and the Ag paste. The specimens were manufactured to perform the experiment as follows. A Si O2 wafer with a 300 mm notch was attached to the electrodes of a SOFC by a Ag paste and Au film, which were deposited on the electrodes by sputtering for 1 min or 5 min deposition time and annealed at300 C for 1 h. The four-point bending test was performed, which resulted in the formation of an extended crack at the tip on the wafer notch, and the crack propagation was observed using a stereo microscope equipped with a charge-coupled device(CCD). Consequently, the interfacial adhesion energy and the effect of the Au film between the each electrode and the Ag paste can be evaluated. On the cathode, the interfacial adhesion energy without Au film was 2.59 J/m2(upper value) and the adhesion energy increased to 11.59 J/m2(upper value) and 15.89 J/m2(lower value) with the Au film. On the anode,the interfacial adhesion energy without Au film was 1.74 J/m2(upper value), which increased to 11.07 J/m2(upper value) and 14.74 J/m2(lower value) with the Au film. In addition, the interface areas were analyzed by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) to estimate the interface delamination.

关键词： Solid oxide fuel cell Au film Interfacial adhesion

Temperature-induced structural static responses of a long-span steel box girder suspension bridge

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2020年第7期21卷 580-592页

作者： Lin-ren ZHOU Lan CHEN Yong XIA Ki Young koo School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeterUK

Temperature is a significant load on bridges,particularly for long-span steel box girder *** study investigates the temperature-induced static responses of a long-span suspension bridge under real service environmental conditions using numerical simulations and field *** 2 D finite element(FE)models of a typical section for the box girder,main cable,hanger,tower column,and crossbeam are *** thermal boundary conditions are determined strictly according to the surrounding environments of a typical sunny day and applied to the FE models.A transient heat-transfer analysis is performed and the time-dependent temperature and its distribution on the bridge are *** addition,a fine,3 D FE model of the bridge is developed for a structural *** calculated temperatures are applied to the 3 D model and the temperature-induced structural responses are *** simulated temperatures and the associated static responses have good agreement with the measured counterparts and support the numerical simulation *** main cable and bridge deck make the greatest contributions to the temperature effects on the suspension *** static responses of bridge caused by the design vehicle load are also *** daily variation of the temperature-induced static responses is comparable with,even higher than,that of the design vehicle load.

关键词： Long-span suspension bridge Temperature effect Static response Vehicle load Field monitoring