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Diffusion-weighted imaging of biliopancreatic disorders:Correlation with conventional magnetic resonance imaging

World Journal of Gastroenterology 2012年第31期18卷 4102-4117页

作者： Nam Kyung Lee Suk kim Gwang Ha kim Dong Uk kim Hyung il Seo tae Un kim Dae Hwan Kang Ho Jin Jang Department of Radiology Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Internal Medicine Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Surgery Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Radiology Yangsan Pusan National University HospitalSchool of MedicinePusan National UniversityYangsan 626-770South Korea Department of Internal Medicine Yangsan Pusan National University HospitalSchool of MedicinePusan National UniversityYangsan 626-770South Korea Department of Obstetrics and Gynecology Armed Forces Seoul HospitalSeoul 110-200South Korea

Diffusion-weighted magnetic resonance imaging(DWI)is a well established method for the evaluation of intracranial diseases,such as acute *** for extracranial application is more difficult due to physiological motion artifacts and the heterogeneous composition of the ***,thanks to the newer technical development of DWI,DWI has become increasingly used over the past few years in extracranial organs including the abdomen and *** previous studies of DWI have been limited to the evaluation of diffuse parenchymal abnormalities and focal lesions in abdominal organs,whereas there are few studies about DWI for the evaluation of the biliopancreatic *** further studies are needed to determine its performance in evaluating bile duct,gallbladder and pancreas diseases,DWI has potential in the assessment of the functional information on the biliopancreatic tract concerning the status of tissue cellularity,because increased cellularity is associated with impeded diffusion,as indicated by a reduction in the apparent diffusion *** detection of malignant lesions and their differentiation from benign tumor-like lesions in the biliopancreatic tract could be improved using DWI in conjunction with findings obtained with conventional magnetic resonance ***,DWI can be useful for the assessment of the biliopancreatic tract in patients with renal impairment because contrast-enhanced computed tomography or magnetic resonance scans should be avoided in these patients.

关键词： Magnetic resonance imaging Diffusion-weighted imaging Biliary tract Gallbladder Pancreas

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Intracorporeal esophagojejunostomy using the double stapling technique after laparoscopic total gastrectomy:A retrospective case-series study

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World Journal of Gastroenterology 2015年第10期21卷 2973-2981页

作者： Jae Hun kim Chang In Choi Dong il kim Dae Hwan kim tae Yong Jeon Dong Heon kim Do Youn Park Department of Surgery Pusan National University Hospital 2nd Bio Medical Research Institute Pusan National University Hospital Department of Pathology Pusan National University Hospital

AIM:To introduce a simple and safe anvil insertion technique to esophagus during laparoscopic total gastrectomy(LTG).METHODS:Between July 2010 and December 2012,58 consecutive patients with early gastric cancer underwent LTG were *** performed a simple and safe Roux-en-Y esophagojejunostomy using the double stapling technique to all *** patients’characteristics,perioperative outcome and histopathologic data were analyzed ***:The mean age and body mass index were59.3±9.7 years and 22.7±2.6 kg/*** mean operation,reconstruction and anvil insertion times(from gastric incision to linear stapling)were 251.8±57.0,43.1±2.8 and 4.2±1.9 min,*** blood loss was 204.6±156.3 m L and there was no open *** postoperative complications were in 8 cases(delayed gastric emptying in 4 cases,pulmonary complication in 2cases,pancreatitis in 1 case,anastomotic stricture in 1case).Anastomotic stricture occurred after discharge and was recovered by endoscopic *** patients were discharged at a mean of 9.6±2.0 d after *** leakage nor bleeding from the esophagojejunostomy occurred *** mean proximal margin of specimen was 2.7±2.8 cm CONCLUSION:Roux-en Y esophagojejunostomy usingthe double stapling technique is simple and rapid,and it may offer a solid,alternative reconstruction method for LTG or proximal gastrectomy.

关键词： Laparoscopic surgery Surgical stapling Roux-en-Y a

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Characterization of Ceramic Composite-Membranes Prepared by ORMOSil Coating Sol

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Journal of Rare Earths 2004年第Z2期22卷 136-140页

作者： Goo-Dae kim tae-Bong kim School of New Materials Science and Engineering Yonsei UniversitySeoul 120-749Korea Division of MaterialsKorea Institute Science and TechnologySeoul 136-791Korea

Sol-gel methods offer many advantages over conventional slip-casting, including the ability to produce ceramic membranes. They are purer, more homogeneous, more reactive and contain a wider variety of compositions. We produced ormosil sol using sol-gel process under different molecular weight of polymer species [polyethylene glycol (PEG) ] in total system [Tetraethyl ortho silicate(TEOS)-polyethylene glycol (PEG)]. The properties of as-prepared ormosil sol such as,viscosity, gelation time were characterized. Also, the ceramic membrane was prepared by dip-coating with synthetic sol and its micro-structure was observed by scanning electron microscopy. The permeability and rejection efficiency of membrane for oil/water emulsion were evaluated as cross-flow apparatus. The ormosil sol coated Membrane is easily formed by steric effect of polymer and it improves flux efficiency because infiltration into porous support decreased. Its flux efficiency is elevated about 200(1/m2·h) compared with colloidal sol coated membrane at point of five minutes from starting test.

关键词： ORMOSil sol crack Resistance ultra-filter micro-filter

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A 2-Dimensional Micro Flow Sensor with Wide Range Flow Sensing Properties

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稀有金属材料与工程 2006年第A3期35卷 590-594页

作者： tae-Yong kim Division of Computer and Information Engineering Dongseo UniversityBusan 617-716Korea

A new silicon micro flow sensor with multiple temperature sensing elements was proposed and numerically simulated in considering wide range flow measuring *** micro flow sensor has three pairs of temperature sensing elements with a central heater compared with typical sensor which has only a temperature sensing element on each side of a central heater.A numerical analysis of the micro flow sensor by Finite Difference Formulation for Heat Transfer Equation was *** nearest pair of temperature sensor showed very good linear sensitivity between 0 to 0.4m/s flow and saturated from 0.75m/s *** the furthest pair of temperature sensor showed some flow sensitivity even though the flow rate of 2.0m/***,this suggested new micro flow meter with multiple temperature sensing elements could be used as a thermal mass flow sensor which has accuracy sensitivity for very wide flow range.

关键词： micro sensor silicon sensor flow sensor 2-D micro flow sensor thermal simulation FDM

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Integrated guidance and control for damping augmented system via convex optimization

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Chinese Journal of Aeronautics 2022年第7期35卷 30-39页

作者： Bong-Gyun PARK tae-Hun kim The 1^(st)R&D Institute-4 Agency for Defense DevelopmentDaejeon 34186Republic of Korea

In this paper,an integrated guidance and control approach is presented to improve the performance of the missile *** approach includes damping augmented system with attitude rate feedback to decrease the oscillation during the homing phase for missiles with low *** addition,physical constraints,which can affect the performance of the missile interception,such as acceleration limit,seeker’s look angle,and look angle rate constraints are *** integrated guidance and control problem is formulated as a convex quadratic optimization problem with equality and inequality constraints,and the solution is obtained by a primal–dual interior point *** performance of the proposed method is verified through several numerical examples.

关键词： Convex optimization Damping augmented system Integrated guidance and control Physical constraint Primal-dual interior point method

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Enhanced thermoelectric composite performance from mesoporous carbon additives in a commercial Bi_(0.5)Sb_(1.5)Te_(3) matrix

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Journal of Materials Science & Technology 2021年第35期94卷 175-182页

作者： Seong-tae kim Jong Min Park Kwi-il Park Sang-Eun Chun Ho Seong Lee Pyuck-Pa Choi Seonghoon Yi School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Composites were prepared,through hot pressing,using carbon materials with different pore size distributions as additives for commercial Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material(BST,p-type).Thermoelectric properties of the composites were measured in a temperature range of 298-473 *** conductivity of the composites,especially lattice thermal conductivity,was effectively decreased due to the mesoporous properties of the incorporated carbon *** electrical conductivity of the composites slightly decreased due to the electron scattering at the interface between the carbon material and the commercial BST *** composite with 0.2 vol.%mesoporous carbon powder(36%mesoporosity)exhibited a figure of merit value approximately 10.7%higher than that of commercial BST without *** behavior resulted in 116%improved output power in the composite block-based single element compared with a bare BST thermoelectric *** enhanced figure of merit was attributed to the effective reduction of lattice thermal conductivity by acoustic phonons scattering at the interface between the BST matrix and the mesoporous carbon as well as at the pore surfaces within the mesoporous *** utilizing mesoporous carbon materials used in this study,the shortcomings and economic difficulties of the composite process with low dimensional carbon additives(carbon nanotubes,graphene,and nanodiamond)can be overcome for extensive practical *** carbon powder with a tailored porosity distribution revealed the validity of bulk-type carbon additives to enhance the figure of merit of commercial thermoelectric materials.

关键词： Thermoelectric material Bi_(0.5)Sb_(1.5)Te_(3) Mesoporous carbon Lattice thermal conductivity Figure of merit

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Hepatoprotective effect of manual acupuncture at acupoint GB34 against CCl_4-induced chronic liver damage in rats

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World Journal of Gastroenterology 2006年第14期12卷 2245-2249页

作者： Yun-Kyoung Yim Hyun Lee Kwon-Eui Hong Young-il kim Byung-Ryul Lee tae-Han kim Ji-Young Yi Department of Meridian & Acupoint College of Oriental Medicine Daejeon University12407 96-3Yongun-dongDong-guDaejeon 300-716South Korea Department of Acupuncture & Moxibustion Dunsan Oriental Hospital of Daejeon University 1136 Dunsan-dongSeo-guDaejeon 302-122South Korea

AIM： To investigate the hepatoprotective effect of manual acupuncture at Yanglingquan （GB34） on CCl4-induced chronic liver damage in rats. METHODS： Rats were injected intraperitoneally with CCh （1 mL/kg） and treated with manual acupuncture using reinforcing manipulation techniques at left GB34 （Yanglingquan） 3 times a week for 10 wk. A nonacupoint in left gluteal area was selected as a sham point. To estimate the hepatoprotective effect of manual acupuncture at GB34, measurement of liver index, biochemical assays including serum ALT, AST, ALP and total cholesterol, histological analysis and blood cell counts were conducted. RESULTS： Manual acupuncture at GB34 reduced the liver index, serum ALT, AST, ALP and total cholesterol levels as compared with the control group and the sham acupuncture group. It also increased and normalized the populations of WBC and lymphocytes. CONCLUSION： Manual acupuncture with reinforcing manipulation techniques at left GB34 reduces liver toxicity, protects liver function and liver tissue, and normalizes immune activity in CCh-intoxicated rats.

关键词： Manual acupuncture Yanglingquan (GB34) CCl4-induced liver damage Hepatoprotective effect

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Effects of foundation damage and water-level change on vibration modal parameters of gravity-type caisson structure

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Science China(Technological Sciences) 2015年第2期58卷 316-329页

作者： LEE So-Young kim Jeong-tae Department of Ocean Engineering Pukyong National University

In this paper,the effects of foundation damage and water-level change on vibration characteristics of gravity-type caisson structure are examined by analyzing modal parameters extracted from output-only *** achieve the objective,the following approaches are ***,vibration response analysis methods are selected to estimate power spectral density and modal parameters such as natural frequency,damping ratio and mode shape of a lab-scale caisson structural ***,vibration tests on the lab-scale caisson system are performed under a series of test scenarios which include three water-level changes and three damage ***,experimental modal parameters corresponding to the damaging cases as well as the water level cases are extracted by frequency domain decomposition method and stochastic subspace identification ***,the effects of the water-level variation and foundation damage on the extracted modal parameters are examined to assess the feasibility of the vibration-based damage detection in gravity-type caisson structures under water-level uncertainty.

关键词： caisson structure gravity-type structure modal parameter effect of water-level foundation damage

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Bright and stable near-infrared perovskite light emitters supported by multifunctional molecule design strategy

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Light(Science & Applications) 2023年第10期12卷 1995-1997页

作者： Joo Sung kim tae-Woo Lee SN Display Co.Ltd. SeoulRepublic of Korea Soft Foundry Seoul National UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSchool of Chemical and Biological EngineeringInstitute of Engineering ResearchSeoul National UniversitySeoulRepublic of Korea

Perovskite light emitters can realize bright,stable and efficient light-emitting diodes through a molecular design strategy that enables strong endurance on high-current operation.

关键词： emitter light diodes

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Ultimate strength of single shear bolted connections with cold-formed ferritic stainless steel

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第2期14卷 120-136页

作者： Jin-seong LIM tae-soo kim Seung-hun kim Department of Architectural Engineering Hanbat National UniversityDaejeon 305-719Korea

This paper is focused on the structural behavior of the single shear bolted connections with thin-walled ferritic stainless *** purpose of this study is to investigate the ultimate behaviors,such as ultimate strength and fracture mode of the single shear bolted connections of thin-walled ferritic stainless steel(low cost steel) rather than austenitic stainless steel(high cost steel).Bolt arrangement and end distance parallel to the direction of applied load are considered as main variables of the test specimens for bolted *** have a constant dimension of edge distance perpendicular to the loading direction,bolt diameter,pitch,and gauge.A monotonic tensile test for specimens has been carried out and some bolted connections with long end distance showed curling(out of plane deformation) occurrence which led to strength *** ultimate behaviors such as fracture mode,ultimate strength are compared with those predicted by current design ***,conditions of curling occurrence and the strength reduction due to curling are investigated and modified strength equations are suggested considering the curling effect.

关键词： Cold-formed ferritic stainless steel Bolted connection Bolt arrangement End distance Curling Strength reduction

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