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Early experience of the compression anastomosis ring (CAR^(TM) 27) in left-sided colon resection

World Journal of Gastroenterology 2011年第43期17卷 4787-4792页

作者： Jung-Yeon lee Jin-Hee Woo Hong-Jo Choi Ki-Jae Park Young-Hoon Roh Ki-Han Kim hak-yoon lee Department of Surgery Dong-A University Medical Center

AIM:To evaluate clinical validity of the compression anastomosis ring(CARTM27) anastomosis in left-sided colonic resection. METHODS:A non-randomized prospective data collection was performed for patients undergoing an elective left-sided colon resection,followed by an anastomosis using the CARTM27 between November 2009 and January *** criteria of the use of the CARTM27 were anastomoses between the colon and at or above the intraperitoneal *** primary short-term clinical endpoint,rate of anastomotic leakage,and other clinical outcomes,including intraand postoperative complications,length of operation time and hospital stay,and the ring elimination time were evaluated. RESULTS:A total of 79 patients(male,43;median age,64 years) underwent an elective left-sided colon resection,followed by an anastomosis using *** was performed laparoscopically in 70 patients,in whom two patients converted to open procedure(2.9%) .There was no surgical *** an intraoperative complication,total disruption of the anastomosis occurred by premature enforced tension on the proximal segment of the anastomosis in one *** ring was removed and another new CARTM27 anastomosis was *** patient with sigmoid colon cancer showed postoperative anastomotic leakage after 6 d postoperatively and temporary diverting ileostomy was *** date of expulsion of the ring could not be recorded because most patients were not aware that the ring had been *** patients manifested clinical symptoms of anastomotic stricture. CONCLUSION:Short-term evaluation of the CARTM27 anastomosis in elective left colectomy suggested it to be a safe and efficacious alternative to the standard hand-sewn or stapling technique.

关键词： Compression anastomosis Colon Anastomotic leakage CARTM27

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Surface effects of hybrid vibration-assisted femtosecond laser system for micro-hole drilling of copper substrate

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中国有色金属学会会刊：英文版 2012年第S3期22卷 801-807页

作者： Jung-Kyu PARK Ji-Woon yoon Myung-Chang KANG Sung-hak CHO Nano Machining Laboratory Korea Institute of Machinery and Materials Department of Nano-Mechatronics University of Science and Technology National Core Research Center for Hybrid Materials Solution Pusan National University

The ultrafast laser based hybrid machining system was studied and a novel approach was demonstrated to improve laser machining quality on metals by vibrating the optical objective lens with a low frequency (500 Hz) and various displacements (0-16.5 μm) during a femtosecond laser machining *** laser used in this experiment is an amplified Ti:sapphire femtosecond (10-15 s) laser system that generates 100 femtosecond pulses having an energy of 3.5 mJ/pulse with a 5 kHz repetition rate at a central wavelength of 790 *** is found that both the wall surface finish of the machined structures and the aspect ratio obtained using the frequency vibration assisted laser machining are improved compared with those derived via laser machining without vibration assistance.

关键词： femtosecond laser hybrid machining vibration-assisted machining surface roughness aspect ratio

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Planning for selective amygdalohippocampectomy involving less neuronal fiber damage based on brain connectivity using tractography

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Neural Regeneration Research 2015年第7期10卷 1107-1112页

作者： Seung-hak lee Mansu Kim Hyunjin Park Department of Electronic Electrical and Computer Engineering Sungkyunkwan University Graduate School of Human ICT Convergence Sungkyunkwan University School of Electronic and Electrical Engineering Sungkyunkwan University

Temporal lobe resection is an important treatment option for epilepsy that involves removal of potentially essential brain regions. Selective amygdalohippocampectomy is a widely performed temporal lobe surgery. We suggest starting the incision for selective amygdalohippocampectomy at the inferior temporal gyrus based on diffusion magnetic resonance imaging（MRI） tractography. Diffusion MRI data from 20 normal participants were obtained from Parkinson＇s Progression Markers Initiative（PPMI） database（***）. A tractography algorithm was applied to extract neuronal fiber information for the temporal lobe, hippocampus, and amygdala. Fiber information was analyzed in terms of the number of fibers and betweenness centrality. Distances between starting incisions and surgical target regions were also considered to explore the length of the surgical path. Middle temporal and superior temporal gyrus regions have higher connectivity values than the inferior temporal gyrus and thus are not good candidates for starting the incision. The distances between inferior temporal gyrus and surgical target regions were shorter than those between middle temporal gyrus and target regions. Thus, the inferior temporal gyrus is a good candidate for starting the incision. Starting the incision from the inferior temporal gyrus would spare the important（in terms of betweenness centrality values） middle region and shorten the distance to the target regions of the hippocampus and amygdala.

关键词： nerve regeneration epilepsy selective amygdalohippocampectomy diffusion tensor imaging tractography connectivity betweenness centrality magnetic resonance imaging network analysis temporal lobe surgery neuronal fibers neural regeneration

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Ni, Co-double hydroxide wire structures with controllable voids for electrodes of energy-storage devices

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Journal of Materials Science & Technology 2020年第20期52卷 126-135页

作者： Jin Kyu Kim Chang Soo lee Jae Hun lee Jung Tae Park Jong hak Kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea

We re port the facile synthesis of Ni,Co-double hydroxide wire(NCHW)-based electrodes directly grown on a conductive substrate via a hydrothermal *** NCHW nanostructures were grown on Ni foam,and the growth was controlled using different compositions of solvents(ethanol and water).With increasing volume ratio of ethanol to water,the density of the wires decreased,and the spatial voids between the wires *** formation of large empty spaces improved the electrochemical performance because the exposure of a large surface area of the structure to the electrolyte resulted in a large number of active sites and facile electrolyte penetration into the *** different NCHW structures were ascribed to the pivotal role of the solvent in the urea hydrolysis;the solvent triggered the formation of hydroxides during the hydrothermal *** electrochemical performance of the NCHW electrodes was investigated via galvanostatic charge/discha rge tests,cyclic voltammetry,and electrochemical impedance *** highest specific capacitance was 1694.7 m F/cm^2 at 2 mA/cm^2,with excellent capacitance retention of 81.5% after 5000 *** superior electrochemical performance of the NCHW electrodes is attributed to the large number of active sites and facile electrolyte diffusion into the structure,due to the well-organized structure with an optimized density of nanowires and large voids between the wires.

关键词： Ni,Co-double hydroxide Nanowire Electrode Energy-storage device Supercapacitor

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Influences of tool plunge speed and tool plunge depth on friction spot joining of AA5454-O aluminum alloy plates with different thicknesses

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中国有色金属学会会刊：英文版 2012年第S3期22卷 629-633页

作者： Sung-Ook yoon Myoung-Soo KANG Yong-Jai KWON Sung-Tae HONG Dong-Hwan PARK Kwang-hak lee Chang-Yong LIM Jong-Dock SEO School of Materials Science and Engineering University of Ulsan School of Mechanical Engineering University of Ulsan Institute of E-Vehicle Technology University of Ulsan Technical Research Laboratories Shin Young Co.Ltd.

AA5454-O aluminum alloy plates with the thicknesses of 1.4 and 1.0 mm were friction-spot-joined (FSJed).The plunge speed of the joining tool was changed in a range of 100 500 mm/min under a constant rotation speed of 500 r/*** plunge depth was ranged from 1.6 mm to 2.2 *** tool plunge speed did not make a remarkable effect on the surface appearance and macro-structure of the FSJed *** average hardness of the FSJed zone was greater than or equal to that of the base ***,there was no remarkable tendency in the average hardness change of the FSJed zone in spite of the variation in the tool plunge speed and tool plunge *** increase of the tool plunge depth resulted in the increase of the tensile shear ***,the change of the tool plunge speed did not lead to the remarkable variation in the tensile shear load of the FSJed *** was noteworthy that the FSJed plate exhibited the highest tensile shear load of about 4.0 kN.

关键词： friction spot joining AA5454-O aluminum alloy plunge speed plunge depth mechanical property

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Characterization of Wollastonite Glass-ceramics Made from Waste Glass and Coal Fly Ash

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Journal of Materials Science & Technology 2013年第2期29卷 149-153页

作者： Soon-Do yoon Jong-Un lee Jeong-Hwan lee Yeon-Hum Yun Wang-Jung yoon School of Biotechnology and Chemical Engineering Chonnam National University Department of Energy & Resources Engineering Chonnam National University

The crystallization behavior of wollastonite glass-ceramics was investigated by means of X-ray diffraction （XRD） analysis and surface morphological observations, and the chemical compositions were evaluated by field emission-scanning electron microscopy （FE-SEM） and energy dispersive X-ray spectroscopy （EDS）. Various heat treatment temperatures （850, 900, 950, 1000 and 1050 ℃） were used to obtain glass-ceramics of the ideal wollastonite crystal phase as well as optimum mechanical properties and chemical durability. From XRD, FE-SEM and EDS, the crystallization of acicular crystal phase in the matrix was achieved at heat treatment temperature of 1000 and 1050 ℃, and wollastonite （CaSiO3） was found in the acicular type main crystal phase in the glass-ceramics. Various properties, such as density, compressive strength, bending strength and chemical durability were also examined. The mechanical properties of glass-ceramics obtained at the heat treatment temperature of 1000 and 1050 ℃ were superior to those obtained at the heat treatment temperature of 850 ℃.

关键词： Coal fly ash Waste glass Mechanical properties Glass-ceramics

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Epidemic obesity in children and adolescents:risk factors and prevention

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Frontiers of Medicine 2018年第6期12卷 658-666页

作者： Eun Young lee Kun-Ho yoon Division of Endocrinology and Metabolism Department of Internal MedicineSeoul St.Mary's HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591Korea Institute of Catholic Ubiquitous Health Care The Catholic University of KoreaSeoul 06591Korea

The prevalence of obesity among children and adolescents (aged 2–18 years) has increased rapidly, with more than 100 million affected in 2015. Moreover, the epidemic of obesity in this population has been an important public health problem in developed and developing countries for the following reasons. Childhood and adolescent obesity tracks adulthood obesity and has been implicated in many chronic diseases, including type 2 diabetes, hypertension, and cardiovascular disease. Furthermore, childhood and adolescent obesity is linked to adulthood mortality and premature death. Although an imbalance between caloric intake and physical activity is a principal cause of childhood and adolescent obesity, environmental factors are exclusively important for development of obesity among children and adolescents. In addition to genetic and biological factors, socioenvironmental factors, including family, school, community, and national policies, can play a crucial role. The complexity of risk factors for developing obesity among children and adolescents leads to difficulty in treatment for this population. Many interventional trials for childhood and adolescent obesity have been proven ineffective. Therefore, early identification and prevention is the key to control the global epidemic of obesity. Given that the proportion of overweight children and adolescents is far greater than that of obesity, an effective prevention strategy is to focus on overweight youth, who are at high risk for developing obesity. Multifaceted, comprehensive strategies involving behavioral, psychological, and environmental risk factors must also be developed to prevent obesity among children and adolescents.

关键词： obesity children adolescents epidemiology risk factor prevention

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Regular truss structure model equivalent to continuum structure

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International Journal of Agricultural and Biological Engineering 2015年第5期8卷 151-161页

作者： Won Choi JeongJae lee Seongsoo yoon Department of Rural Systems Engineering College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department of Rural Systems Engineering Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department.of Agricultural and Rural Engineering College of AgricultureLife and Environments SciencesChungbuk National UniversityChungbuk 362-763South Korea

It is difficult to solve the structural problems related to agricultural engineering,due to the wide ranges of the means of related variables and complex structural *** these reasons,discrete models are required that are able to replace or simplify solid structure components used in traditional analysis ***,the objective of this study was to develop a regular truss structure model that behaves the same way as a solid *** was assumed that if a unit element consists of truss elements with each hinge at the end of the element and the size of the element is infinitesimal,the stress distribution and displacement field will be constant throughout the domain of the unit ***,the behavior of the truss element was assumed to be in a linear state in a two-dimensional *** law of energy conservation,based on the theory of elasticity,was applied to determine the equilibrium conditions between discretized and solid *** restrictive condition that we obtained revealed that applications are limited to only ideal elastic materials with a Poisson’s ratio of 1 to *** volumetric ratio of the equivalent truss to the continuum structures was 3:1,regardless of the size or number of the *** calculate the internal stress and strain of the unit element,the geometric relationships of each truss member,which has its own role against different stress directions,were *** calculated von Misses stresses were used to verify this *** concentrations,as explained based on Saint Venant’s principle,were also observed in the equivalent truss structure *** main stress paths,indicating the areas where reinforcement bars should be placed,were successfully shown without the requirement that each element be transformed in the direction of principal stress;this was done by eliminating elements with only compressive and near-zero stresses.

关键词： structural analysis regular mesh equivalent truss structure model discretized element energy method

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Internal modification in transparent hybrid germanium-silica plates using plasma formation induced by a femtosecond laser

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中国有色金属学会会刊：英文版 2012年第S3期22卷 808-812页

作者： Ji-Wook yoon Jung-Kyu PARK Kwang-Ho KIM Myung-Chang KANG Sung-hak CHO Nano Machining Laboratory Korea Institute of Machinery and Materials Department of Nano-Mechatronics University of Science and Technology National Core Research Center for Hybrid Materials Solution Pusan National University

The fabrication of an internal diffraction grating with photoinduced refractive index modification in planar hybrid germanium-silica plates was demonstrated using low-density plasma formation excited by a high-intensity femtosecond (150 fs) Ti:sapphire laser (λp=790 nm).The refractive index modifications with diameters ranging from 400 nm to 3 μm were photoinduced after plasma formation occurred upon irradiation with peak intensities of more than 2×1013 W/*** graded refractive index profile was fabricated to be a symmetric around from the center of the point at which low-density plasma occurred.

关键词： diffraction grating refractive index modification plasma formation hybrid germanium-silica plate femtosecond laser

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Atomically Adjustable Rhodium Catalyst Synthesis with Outstanding Mass Activity via Surface-Li mi ted Cation Exchange

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Energy & Environmental Materials 2024年第2期7卷 83-92页

作者： hak Hyeon lee Dong Su Kim Swagotom Sarker Ji Hoon Choi Ho Seong lee Hyung Koun Cho Department of Advanced Materials Science&Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-doSeoul 16419Korea Department of Advanced Materials Science&Engineering Kyungpook National University80Daehak-roBuk-guDaegu 41566Korea

Rh has been widely studied as a catalyst for the promising hydrazine oxidation reaction that can replace oxygen evolution reactions for boosting hydrogen production from hydrazine-containing *** Rh being expensive,only a few studies have examined its electrocatalytic mass ***,surface-limited cation exchange and electrochemical activation processes are designed to remarkably enhance the mass activity of *** atoms were readily replaced at the Ni sites on the surface of NiOOH electrodes by cation exchange,and the resulting RhOOH compounds were activated by the electrochemical reduction *** cation exchange-derived Rh catalysts exhibited particle sizes not exceeding 2 nm without agglomeration,indicating a decrease in the number of inactive inner Rh ***,an improved mass activity of 30 A mg_(Rh)^(-1)was achieved at 0.4 V versus reversible hydrogen ***,the two-electrode system employing the same CE-derived Rh electrodes achieved overall hydrazine splitting over 36 h at a stable low *** proposed surface-limited CE process is an effective method for reducing inactive atoms of expensive noble metal catalysts.

关键词： cation exchange synthesis electrochemical metallization hydrazine oxidation reaction mass activity rhodium catalyst

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