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Giant choledocholithiasis treated by mechanical lithotripsy using a gastric bezoar basket

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World Journal of Gastroenterology 2012年第25期18卷 3327-3330页

作者： Hyun Jung Chung Seok Jeong Don Haeng Lee Jung Il Lee Jin-Woo Lee Byoung Wook Bang Kye Sook Kwon hyung Kil Kim Yong Woon shin Young Soo Kim Division of Gastroenterology Department of Internal MedicineInha University School of MedicineIncheon 400-711South Korea

Mechanical lithotripsy （ML） is usually considered as a standard treatment option for large bile duct stones. However, it is impossible to retrieve oversized stones because the conventional lithotripsy basket may not be able to grasp the stone. However, there is no es- tablished endoscopic extraction method for such gi- ant stone removal. We describe a case of successful extraction of a 4-cm large stone using a gastric bezoar basket. A 78-year-old woman had suffered from upper abdominal pain for 20 d. Contrast-enhanced computed tomogram revealed a 4-cm single stone in the distal common bile duct （CBD）. Endoscopic stone retraction was decided upon and endoscopic papillary balloon dilation was performed using a large balloon. An at- tempt to capture the stone using a standard lithotripsy basket failed due to the large stone size. Subsequently, we used a gastric bezoar basket to successfully capturethe stone. The stone was fragmented into small pieces and extracted. The stone was completely removed after two sessions of endoscopic retrograde cholangio- pancreatography; each of which took 30 rain. No com- plications occurred during or after the procedure. The patient was fully recovered and discharged on day 11 of hospitalization. ML using a gastric bezoar basket is a safe and effective retrieval method in select cases, and is considered as an alternative nonoperative option for the management of difficult CBD stones.

关键词： Giant choledocholithiasis Mechanical litho-tripsy Bezoar basket Common bile duct stone Endo-scopic papillary balloon dilatal^ion

Photocatalytic decomposition of mobile-source related pollutants using a continuous-flow reactor

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Journal of Environmental Sciences 2010年第3期22卷 460-466页

作者： Wan-Kuen Jo Seung-Ho shin Department of Environmental Engineering Kyungpook National University

This study evaluated the application of a continuous-flow photocatalytic reactor for the control of two mobile-derived pollutants, methyl-tertiary butyl ether （MTBE） and naphthalene, present at in-vehicle levels. Variables tested for this study included the hydraulic diameter （HD）, stream flow rate （SFR）, relative humidity （RH）, and feeding type （FT）. The fixed parameters included contaminant concentration, ultraviolet light source, and the weight of TiO2. In all experimental conditions the adsorption process reached equilibrium within 30 to 180 min for the target compounds, and the outlet concentrations of the photocatalytic oxidation （PCO） reactor while operating reached a steady state within 60 to 180 min. The degradation of the target compounds was dependent on RH, HD, FT, or SFR. The PCO system exhibited high degradation （up to nearly 100% for certain conditions） and mineralization efficiencies of target compounds, suggesting that this system can effiectively be employed to improve indoor air quality. Moreover, it was confirmed that trichloroethylene at urban-ambient level also could enhance the degradation efficiency of naphthalene when applying the PCO technology inside vehicles.

关键词： in-vehicle level methyl-tertiary butyl ether naphthalene trichloroethylene

Structural effects of 3D printing resolution on the gauge factor of microcrack-based strain gauges for health care monitoring

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Microsystems & Nanoengineering 2022年第1期8卷 175-184页

作者： Sanghun shin Byeongjo Ko Hongyun So Department of Mechanical Engineering Hanyang UniversitySeoul 04763South Korea Institute of Nano Science and Technology Hanyang UniversitySeoul 04763South Korea

Measurements of physiological parameters such as pulse rate,voice,and motion for precise health care monitoring requires highly sensitive *** strain gauges are useful sensors that can be used in human health care *** this study,we propose a crack-based strain gauge fabricated by fused deposition modeling(FDM)-based three-dimensional(3D)-*** strain gauge combined a 3D-printed thermoplastic polyurethane layer and a platinum layer as the flexible substrate and conductive layer,*** a layer-by-layer deposition process,self-aligned crack arrays were easily formed along the groove patterns resulting from stress concentration during stretching *** gauges with a 200-μm printing thickness exhibited the most sensitive performance(~442%increase in gauge factor compared with that of a flat sensor)and the fastest recovery time(~99%decrease in recovery time compared with that of a flat sensor).In addition,500 cycling tests were conducted to demonstrate the reliability of the ***,various applications of the strain gauge as wearable devices used to monitor human health and motion were *** results support the facile fabrication of sensitive strain gauges for the development of smart devices by additive manufacturing.

关键词： strain crack cycling

CHEBYSHEV WEIGHTED NORM LEAST-SQUARES SPECTRAL METHODS FOR THE ELLIPTIC PROBLEM

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Journal of Computational Mathematics 2006年第4期24卷 451-462页

作者： Sang Dong Kim Byeong Chun shin Department of Mathematics Kyungpook National University Taegu 702-701 Korea Department of Mathematics Chonnam National University Kwangju 500-757 Korea

We develop and analyze a first-order system least-squares spectral method for the second-order elhptic boundary value problem with variable coefficients. We first analyze the Chebyshev weighted norm least-squares functional defined by the sum of the Lw^2- and Hw^-1- norm of the residual equations and then we eplace the negative norm by the discrete negative norm and analyze the discrete Chebyshev weighted least-squares method. The spectral convergence is derived for the proposed method. We also present various numerical experiments. The Legendre weighted least-squares method can be easily developed by following this paper.

关键词： Least-squares methods Spectral method Negative norm.

Novel developments in computational spectropolarimeter

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Light(Science & Applications) 2023年第3期12卷 321-322页

作者： En-Lin Hsiang shin-Tson Wu College of Optics and Photonics University of Central FloridaOrlandoFL 32816USA

Compared to conventional bulky spectropolarimeters,computational spectropolarimeters which reconstruct light-field information such as polarization and spectrum in a compact form factor,are critical equipment enabling new *** key component of a computational spectropolarimeter is a tunable light-field modulator,in which liquid crystal-based device is a promising *** varying the applied voltage,the tunable liquid crystal metasurface can modulate the phase and spectral information of the incident light,and after a few trials,this important information can be decoded *** a novel approach paves the foundation for developing compact and low-cost spectropolarimetric imaging devices with widespread applications in biomedical imaging,remote sensing,and optical communications.

关键词： tunable polarization modulator

Effect of CaF2 content in refining slag on formation behavior of spinel inclusion in Ni-Cr-V-alloyed special steel

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Journal of Iron and Steel Research International 2018年第2期25卷 157-163页

作者： Jae-hong shin Joo-hyun Park Department of Materials Engineering Hanyang UniversityAnsan 426-791 Korea

The influence of CaF2 content on the formation behavior of spinel inclusions in the Ni-Cr-V-alloyed special steel was presented. The spinel was not formed at CaF2 content lower than 10 wt%. However, it was formed at early stage when the CaF2 content was greater than 30 wt%, followed by a modification to the aluminosilicate-type inclusions. Because the slag was saturated by MgO, the activity of MgO was unity irrespective of CaF2 content in the slag. Thus, Mg was transferred from slag to metal phase. Mg transferred to molten steel reacted with Al2O3-rich inclusions to form ***2O3 spinel. However, the spinel inclusion was modified to aluminosilicate-type inclusions by the reaction with Si and Ca transferred from slag to molten steel about 2-3 h later.

关键词： Spinel inclusion Refining slag CaF2 content Ni-Cr-V-alloyed special steel

Hybrid Broadcast for the Video—on—Demand Service

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Journal of Computer Science & Technology 2002年第4期17卷 397-410页

作者：马华东 KangG.shin CollegeofComputerScienceandTechnolgoy BeijingUniversityofPostandTececommunicationsBeijing100876P.R.China Real－TimeComputingLab EECSDepartmentTheUniversityofMichiganAnnArborMI4

Multicast offers an efficient means of distributing video contents/programs to multiple clients by batching their requests and then having them share a server's video *** customers' requests is either client-initiated or *** anvanced client-initiated video multicasts are implemented by *** broadcast,a typical server-initiated approach,can be entirety-based or *** paper focuses on the performance of the VoD service for popular ***,we analyze the limitation of conventional patching when the customer request rate is ***,By combining the advantages of each of the two broadcast schemes,we propose a hybrid broadcast scheme for popular videos ,which not only lowers the serviec latency but also improves clients' interactivity by using an active buffering technique ,This is shown to be a good compromise for both lowering service latency and improving the VCR-like interactivity.

关键词： quality-of-service interactivityscheduling video-on-demand broadcast multicast

A Multifunctional Modulator Coordinates Nuclear Transcription and Plastid Metabolism and Proliferation

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Molecular Plant 2020年第6期13卷 820-822页

作者： shin-ya Miyagishima Department of Gene Function and Phenomics National Institute of GeneticsShizuoka 411-8540Japan Department of Genetics The Graduate University for Advanced StudiesSOKENDAIShizuoka 411-8540Japan JST-Mirai Program Japan Science and Technology AgencySaitama 332-0012Japan

The photosynthetic plastid(chloroplast)arose more than one billion years ago,when a free-living cyanobacterium became a permanent endosymbiont and remodeled as an organelle in an ancient eukaryotic algal cell(Archibald,2015).Seed plants further evolved mechanisms of plastid differentiation,whereby several types of non-green non-photosynthetic plastids develop in addition to chloroplasts,including amyloplasts,which accumulate starch granules,and chromoplasts,which deposit carotenoids(Pyke,2010,Sun et al.,2018).Plastid differentiation enables multicellular plants to assign specialized roles to different tissues upon cellular differentiation and/or in response to developmental and environmental changes.

关键词： specialized enable last

DEM simulation of particle mixing in a sheared granular flow

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Particuology 2008年第6期6卷 445-454页

作者： Li-shin Lu Shu-San Hsiau Department of Mechanical Engineering Technology and Science Institute of Northern Taiwan Department of Mechanical Engineering National Central University

Mixing behaviors of particles are simulated in a sheared granular flow using differently colored but otherwise identical glass spheres, with five different bottom wall velocities. By DEM simulation, the solid fractions, velocities, velocity fluctuations and granular temperatures are measured. The mixing layer thicknesses are compared with the calculations from a simple diffusion equation using the data of apparent self-diffusion coefficients obtained from the current simulation measurements. The calculations and simulation results showed good agreements, demonstrating that the mixing process of granular materials occurred through the diffusion mechanism.

关键词： DEM Particle mixing Sheared granular flow Diffusion