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Long-type double-balloon enteroscopy-assisted ERCP using hand-made accessories in Roux-en-Y hepaticojejunostomy(with video)

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Hepatobiliary & Pancreatic Diseases International 2021年第4期20卷 407-408页

作者： Min Jae Yang Ah Reum Kim Jae Chul Hwang Byung Moo yoo jin Hong Kim Department of Gastroenterology Ajou University School of MedicineSuwonSouth Korea

To the Editor:Short-type balloon enteroscope-assisted endoscopic retrograde cholangiopancreatography(BE-ERCP)is becoming the procedure of choice for biliopancreatic disease treatment in patients with postoperative anatomy^([1,2]).However,it has not yet been available in many *** a long-type balloon enteroscope with a200-cm working length has been widely used for small bowel endoscopy,its use for ERCP was limited by the lack of commercially available extra-long accessories^([3]).

关键词： balloon anatomy ERCP

Evaluation of defects in aluminum piston castings by using ultrasonics and computer tomography

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China Foundry 2012年第3期9卷 275-278页

作者： In-Sung Cho Jeong-Ho Hwang jin-Seok Yang Seung-Mok yoo Chae-Ho Lim Korea Institute of Industrial Technology

Pistons used in automobile engines are made of aluminum alloy; and endurance of high pressure and high temperature is required. Recently, high strength pistons are needed to cope with the increase of pressure and temperature in the engine cylinder. A high strength piston is possible when the piston casting has little or no casting defects, such as micro-pores and cracks. Generally the defects can be evaluated by non-destructive testing (NDT), and the most efficient ways for evaluation are using ultrasonics and computer tomography. In the present study, two NDT methods were compared and evaluated to investigate the defects in the aluminum piston castings. Artificial defects were machined by using very small drill bits with diameters 1, 0.5, 0.3, 0.2 and 0.1 mm. The defects were investigated by using an ultrasonic tester and a computer tomography system. Defects smaller than 0.3 mm may not be found by using the ultrasonic test, but the defects may be found by using the computer tomography system. The investigation conditions for detecting small defects and the scanning time for in-line defect analysis are discussed in the present study.

关键词： piston ultrasonic test computer tomography aluminum defect

Proteomic identification of cryostress in epididymal spermatozoa

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Journal of Animal Science and Biotechnology 2017年第2期8卷 478-489页

作者： Sung Jae yoon Md Saidur Rahman Woo Sung Kwon Do Yeal Ryu yoo jin Park Myung Geol Pang Department of Animal Science&Technology Chung-Ang UniversityAnseongGyeonggi-Do 456-756Republic of Korea

Background： Cryopreservation of epididymal spermatozoa is important in cases in which it is not possible to collect semen using normal methods, as the sudden death of an animal or a catastrophic injury. However, the freezing and thawing processes cause stress to spermatozoa, including cold shock, osmotic damage, and ice crystal formation,thereby reducing sperm quality. We assessed the motility（%）, motion kinematics, capacitation status, and viability of spermatozoa using computer-assisted sperm analysis and Hoechst 33258/chlortetracycline fluorescence ***, we identified proteins associated with cryostress using a proteomic approach and performed western blotting to validate two-dimensional electrophoresis（2-DE） results using two commercial ***： Cryopreservation reduced viability（%）, motility（%）, straight-line velocity（VSL）, average path velocity（VAP）, amplitude of lateral head displacement（ALH）, and capacitated spermatozoa, whereas straightness（STR）and the acrosome reaction increased after cryopreservation（P 3 fold, P ＆lt; 0.05） before and after cryopreservation. The proteins differentially expressed following cryopreservation are putatively related to several signaling pathways, including the ephrinR-actin pathway, the ROS metabolism pathway, actin cytoskeleton assembly, actin cytoskeleton regulation,and the guanylate cyclase ***： The results of the current study provide information on epididymal sperm proteome dynamics and possible protein markers of cryo-stress during cryopreservation. This information will further the basic understanding of cryopreservation and aid future studies aiming to identify the mechanism of cryostress responses.

关键词： Cryopreservation Cryostress Protein Spermatozoa

Sensitivity of Snowfall Characteristics to Meteorological Conditions in the Yeongdong Region of Korea

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Advances in Atmospheric Sciences 2021年第3期38卷 413-429页

作者： yoo-Jun KIM So-Ra IN Hae-Min KIM jin-Hwa LEE Kyu Rang KIM Seungbum KIM Byung-Gon KIM High Impact Weather Research Department National Institute of Meteorological SciencesGangneung 25457Korea Operational Systems Development Department National Institute of Meteorological SciencesSeogwipo 63568Korea Department of Atmospheric Environmental Sciences Gangneung-Wonju National UniversityGangneung 25457Korea

This study investigates the characteristics of cold clouds and snowfall in both the Yeongdong coastal and mountainous regions under different meteorological conditions based on the integration of numerical modeling and three-hourly rawinsonde observations with snow crystal photographs for a snowfall event that occurred on 29−30 January *** found that rimed particles predominantly observed turned into dendrite particles in the latter period of the episode when the 850 hPa temperature decreased at the coastal site,whereas the snow crystal habits at the mountainous site were largely needle or rimed *** soundings showed a well-defined,two-layered cloud structure along with distinctive wind-directional shear,and an inversion in the equivalent potential temperature above the low-level cloud *** first experiment with a decrease in lower-layer temperature showed that the low-level cloud thickness was reduced to less than 1.5 km,and the accumulated precipitation was decreased by 87%compared with the control *** difference in precipitation amount between the single-layered experiment and control experiment(two-layered)was not so significant to attribute it to the effect of the seeder−feeder *** precipitation in the last experiment by weakening winddirectional shear was increased by 1.4 times greater than the control experiment specifically at the coastal site,with graupel particles accounting for the highest proportion(~62%).The current results would improve snowfall forecasts in complicated geographical environments such as Yeongdong in terms of snow crystal habit as well as snowfall amount in both time and space domains.

关键词： Yeongdong snow crystal rawinsonde cloud-resolving model

Representation of Urban Buildings Using Modified Relief Mapping

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Journal of Computer Science & Technology 2006年第2期21卷 204-208页

作者： Byounghynn yoo Soonhung Han Department of Mechanical Enginccring Koren Aduanced Institute of Science and TechnologyDeajeon305-701Korea

This paper describes the real-time mapping displacement of buildings onto the polygon model of base terrain of geo-spatial information,The buildings are represented as height maps,lcading to low memory requirements and not involving changes of the original geometry（*** vertices are created or displaced）.The displacement of buildings is mapped toward the protruding direction,The base of textrue which represents the ground in topography is correctly mapped onto base polygon without any *** approach can exhibit the correct,occlusions between buildings and ground due to parallax and correct self-occlusion.

关键词： acrial photograph digital map displacement mapping gco-visualization image-based rendering

Machining characteristics of complex prism pattern on electroplated roll by copper

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中国有色金属学会会刊：英文版 2009年第B9期19卷 288-294页

作者： Tae-jin JE Sang-Cheon PARK Kang-Won LEE Yeong-Eun yoo Doo-Sun CHOI Kyung-Hyun WHANG Myung-Chang KANG Nano-Machining Laboratory Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Nano-Mechatronics Department University of Science and TechnologySinseongnoYouseong-GuDaejeonKorea National Core Research Center for Hybrid Materials Solution Pusan National University

The BLU (back light unit) is the core component of the LCD for notebook, mobile-phone, navigation, as well as large sized TV, PID (public information display), etc. In order to enhance optical efficiency of LCD, optical films with the uniform prism patterns have been used for BLU by stacking two films up orthogonally. In this case, light interference-phenomenon occurred such as Morie, wet-out, u-turning, etc. It caused several problems such as low brightness, spots and stripes in LCD. Recently, the high-luminance micro complex prism patterns are actively studied to avoid the light interference-phenomenon and enhance the optical efficiency. In this study, the roll master to manufacture complex micro prism pattern film was machined by using the high precision lathe. The machined patterns on the roll master were 50, 45, 40, 35, 30, 25, 20, 15, 10 and 5 μm in the pitch with 25.0, 22.5, 20.0, 17.5, 15.0, 12.5, 10.0, 7.5, 5.0 and 2.5 μm in the peak height, respectively. The roll was 2 000 mm in length and 320 mm in diameter. The electroplated roll by copper and the natural single crystal diamond tool was used for machining the patterns. The cutting force was measured and analyzed for each cutting condition by using the dynamometer. The chips and the surfaces after being machined were analyzed by SEM and microscope.

关键词：车床加工微棱镜铜电镀特征光学效率光学薄膜笔记本电脑金刚石工具

Sulfonated fluorinated multi-block copolymer hybrid containing sulfonated(poly ether ether ketone) and graphene oxide: A ternary hybrid membrane architecture for electrolyte applications in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2018年第4期27卷 1247-1260页

作者： Ae Rhan Kim Mohanraj Vinothkannan Dong jin yoo Department of Bioenvironmental Chemistry and R&D Center for CANUTECH Business Incubation Center Chonbuk National University Graduate School Department of Energy Storage/Conversion Engineering Hydrogen and Fuel Cell Research Center Chonbuk National University Department of Life Science Chonbuk National University

A ternary hybrid membrane architecture consisting of sulfonated fluorinated multi-block copolymer （SFMC）, sulfonated （poly ether ether ketone）（SPEEK） and I or 5 wt% graphene oxide （GO） was fabricated through a facile solution casting approach. The simple, but effective monomer sulfonation was performed for SFMC to create compact and rigid hydrophobic backbone structures, while conventional random sulfonation was carried-out for SPEEK. Hydrophilic-hydrophobic-hydrophilic structure of SFMC enhances the compatibility with SPEEK and GO and allows for an unprecedented approach to alter me- chanical strength and proton conductivity of ternary hybrid membrane, as verified from universal test machine （UTM） curves and alternating current （AC） impedance plots. The impact of GO integration on the morphology and roughness of hybrid membrane was scrutinized using field emission scanning electron microscope （FE-SEM） and atomic force microscope （AFM）. Ternary hybrid showed uniform intercalation of GO nanosheets throughout the entire surface of membrane with an increased surface roughness of 8.91 nm. The constructed ternary hybrid membrane revealed excellent water absorption, ion exchange capacity and gas barrier properties, while retaining reasonable dimensional stability. The well-optimized ternary hybrid membrane containing 5 wt% GO revealed a maximum proton conductivity of 111.9 mS/cm, which is higher by a factor of two-fold with respect to that of bare SFMC membrane. The maximum PEMFC power density of 528.07mW/cm2 was yielded by ternary hybrid membrane at a load current density of 1321.1 mA/cm2 when operating the cell at 70 ℃ under 100% relative humidity （RH）. In comparison, a maximum power density of only 182.06 mW/cm2 was exhibited by the bare SFMC membrane at a load current density of 455.56 mA/cm2 under same operating conditions.

关键词： Sulfonated fluorinated multi-block copolymer Sulfonated(poly ether ether ketone) Graphene oxide Hydrogen bonding Proton conductivity

Numerical Modeling of a Spar Platform Tethered by a Mooring Cable

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Chinese Journal of Mechanical Engineering 2015年第4期28卷 785-792页

作者： ZHU Xiangqian yoo Wan-Suk Computer Aided Engineering Laboratory School of Mechanical Engineering Pusan National University

Virtual simulation is an economical and efficient method in mechanical system design. Numerical modeling of a spar platform, tethered by a mooring cable with a spherical joint is developed for the dynamic simulation of the floating structure in ocean. The geometry modeling of the spar is created using finite element methods. The submerged part of the spar bears the buoyancy, hydrodynamic drag force, and effect of the added mass and Froude-Krylov force. Strip theory is used to sum up the forces acting on the elements. The geometry modeling of the cable is established based on the lumped-mass-and-spring modeling through which the cable is divided into 10 elements. A new element-fixed local frame is used, which is created by the element orientation vector and relative velocity of the fluid, to express the loads acting on the cable. The bottom of the cable is fixed on the seabed by spring forces, while the top of the cable is connected to the bottom of the spar platform by a modified spherical joint. This system suffers the propagating wave and current in the X-direction and the linear wave theory is applied for setting of the propagating wave. Based on the numerical modeling, the displacement-load relationships are analyzed, and the simulation results of the numerical modeling are compared with those by the commercial simulation code, Proteus DS. The comparison indicates that the numerical modeling of the spar platform tethered by a mooring cable is well developed, which provides an instruction for the optimization of a floating structure tethered by a mooring cable system.

关键词： numerical modeling dynamic simulation spar platform mooring cable spherical joint

Dietary fat-associated osteoarthritic chondrocytes gain resistance to lipotoxicity through PKCK2/STAMP2/FSP27

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Bone Research 2018年第3期6卷 238-251页

作者： Sung Won Lee Jee Hyun Rho Sang Yeob Lee Won Tae Chung yoo jin Oh Jung Ha Kim Seung Hee yoo Woo Young Kwon Ju Yong Bae Su Young Seo Hokeun Sun Hye Young Kim Young Hyun yoo Department of Rheumatology Dong-A University College of Medicine Department of Anatomy and Cell Biology Dong-A University College of Medicine and Mitochondria Hub Regulation Center Department of Microbiology Dong-A University College of Medicine Department of Statistics Pusan National University

Free fatty acids(FFAs), which are elevated with metabolic syndrome, are considered the principal offender exerting lipotoxicity. Few previous studies have reported a causal relationship between FFAs and osteoarthritis pathogenesis. However, the molecular mechanism by which FFAs exert lipotoxicity and induce osteoarthritis remains largely unknown. We here observed that oleate at the usual clinical range does not exert lipotoxicity while oleate at high pathological ranges exerted lipotoxicity through apoptosis in articular chondrocytes. By investigating the differential effect of oleate at toxic and nontoxic concentrations, we revealed that lipid droplet(LD) accumulation confers articular chondrocytes, the resistance to lipotoxicity. Using high fat diet-induced osteoarthritis models and articular chondrocytes treated with oleate alone or oleate plus palmitate, we demonstrated that articular chondrocytes gain resistance to lipotoxicity through protein kinase casein kinase 2(PKCK2)—six-transmembrane protein of prostate 2(STAMP2)—and fat-specific protein 27(FSP27)-mediated LD accumulation. We further observed that the exertion of FFAs-induced lipotoxicity was correlated with the increased concentration of cellular FFAs freed from LDs, whether FFAs are saturated or not. In conclusion, PKCK2/STAMP2/FSP27-mediated sequestration of FFAs in LD rescues osteoarthritic chondrocytes. PKCK2/STAMP2/FSP27 should be considered for interventions against metabolic OA.

关键词： osteoarthritis remains articular chondrocytes