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Han Gyeol Park,김태중,Soon Yong Hwang,Jun Young Kim,Junho Choi,김영동,Sang Hoon Shin,송진동 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.4
We report the complex pseudodielectric function < " > = < "1 > + i < "2 > of an oxide-freeAlSb film for energies from 0.7 to 5.0 eV and temperatures from 300 to 803 K. The 1.5-μm-thick filmwas grown on a (001) GaAs substrate by using molecular beam epitaxy. We maintained the film inan ultrahigh vacuum to prevent oxidation artifacts and used a rotating-compensator ellipsometer toobtain the optical properties. Critical-point (CP) energies were obtained by numerically calculatingsecond energy derivatives of the data. Blue shifts of the CP energies and sharper structures wereobserved with decreasing temperature. The calculated CP energies were fit to a linear equation.
( Han Gyeol Kim,),( Kwang Jae Lee ),( Sun Gyo Lim ),( Jae Yeon Jung ),( Sung Won Cho ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2012 Journal of Neurogastroenterology and Motility (JNM Vol.18 No.2
Background/Aims Guanine nucleotide binding protein (G-protein) beta polypeptide 3 (GNB3) C825T polymorphism alters intracellular signal transduction, which may lead to motor or sensory abnormalities of the gastrointestinal tract. The aim of the present study was to evaluate the association of the GNB3 C825T polymorphism with susceptibility to overlap syndrome of functional dyspepsia (FD) and irritable bowel syndrome (IBS) in a Korean population. Methods One hundred sixty-seven patients with FD alone, 60 patients with IBS alone, 85 patients with the overlap of FD and IBS, and 434 asymptomatic healthy subjects participated in the study. Genotyping for GNB3 C825T polymorphism was performed using their blood samples. Results No association of GNB3 genotypes in patients with FD alone, IBS alone or overlap phenotype, when compared to genotypes in controls, was detected. The frequency of CT and TT genotypes relative to the CC genotype for the phenotypes of FD alone, IBS alone and the coexistence of FD and IBS did not significantly differ. Comparison of the TT genotype with the CC/CT genotype showed no significant association for each phenotype group. Conclusions There is no apparent association of the GNB3 C825T polymorphism with the susceptibility to FD, IBS or the overlap of FD and IBS. Larger-scale studies and further investigation on other candidate genes are required.
Han-Gyeol Lee 물리치료재활과학회 2021 Physical therapy rehabilitation science Vol.10 No.4
Objective: The purpose of this study was to investigate the effects of coordinative locomotor training(CLT) using elastic bands on dynamic balance and grip strength for Elementary school baseball players and to provide correct posture guidance and reference on the prevention and rehabilitation program of sports damage and injury in the future. Design: Two groups pre-post randomized controlled design. Methods: Forty-six subjects were randomly divided in two groups;1) CLT using Elastic Band group(Experimental group, n=23), 2) Routine baseball training group(Control group, n=23). The intervention was conducted total 16 times for sixty minutes a day, 2 times a week, for 8 weeks. Evaluations of dynamic balance ability and grip strength were performed with all subjects before the commencement of training and 8 weeks after training. Results: Compared to the control group after training, the dynamic balance ability and dominant handgrip strength of the experimental group were significantly more improved(p<0.05). Conclusions: We confirmed that the effects of CLT using elastic bands on dynamic balance ability and grip strength in Elementary school baseball player. This study should be used for improving the quality of the Elementary school baseball player’s training and would be contributed prevention and rehabilitation program of sports damage and injury.
Han Gyeol Kim,Jong-Il Park,Gang-Ho Lee 한국물리학회 2013 Current Applied Physics Vol.13 No.7
A facile surface coating of aluminum (Al) nanoparticles with various dispersants by using a wet ball milling method is reported. Various mixtures of Al nanoparticles (d = 30e130 nm) and dispersants in solvent were ball milled. The excellent surface coating was observed with coating thickness ranging from 10 to 13 nm. The resulting good colloidal stability confirmed by both visual inspection of colloidal precipitation and Turbiscan backscattering was attributed to a stable dispersant organic layer formed on Al nanoparticle surfaces after ball milling as observed in HRTEM images. This method can be extended to the synthesis of a variety of any other metallic nano-colloidal solutions.
Han Gyeol Kim,Joonho Lee,Guy Makov 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.5
Bi–Sn alloy phase diagram under pressure was re-calculated using the CALculation of PHAse Diagrams method by applyingnew density data. Theoretically, alloy phase diagram under pressure can be calculated with bulk thermodynamic databaseand thermophysical property data such as density and sonic velocity. In the recent study by Emuna et al. (J Alloys Compd687:360–369, 2016), thermodynamic parameters were determined from literature values with additional modification tofit experimental data of phase boundaries. In this study, density of liquid Bi–Sn alloys was re-evaluated with an advanceddensity measurement technique: the constrained drop method. By applying the new density data, the Bi–Sn phase diagramunder pressure could be calculated successfully without any modification of thermodynamic parameters.
Robot-Assisted Free Flap in Head and Neck Reconstruction
Han Gyeol Song,윤인식,이원재,유대현,나동균 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.4
Background Robots have allowed head and neck surgeons to extirpate oropharyngeal tumors safely without the need for lip-split incision or mandibulotomy. Using robots in oropharyngeal reconstruction is new but essential for oropharyngeal defects that result from robotic tumor excision. We report our experience with robotic free-flap reconstruction of head and neck defects to exemplify the necessity for robotic reconstruction. Methods We investigated head and neck cancer patients who underwent ablation surgery and free-flap reconstruction by robot. Between July 1, 2011 and March 31, 2012, 5 cases were performed and patient demographics, location of tumor, pathologic stage, reconstruction methods, flap size, recipient vessel, necessary pedicle length, and operation time were investigated. Results Among five free-flap reconstructions, four were radial forearm free flaps and one was an anterolateral thigh free-flap. Four flaps used the superior thyroid artery and one flap used a facial artery as the recipient vessel. The average pedicle length was 8.8 cm. Flap insetting and microanastomosis were achieved using a specially manufactured robotic instrument. The total operation time was 1,041.0 minutes (range, 814 to 1,132 minutes), and complications including flap necrosis, hematoma, and wound dehiscence did not occur. Conclusions This study demonstrates the clinically applicable use of robots in oropharyngeal reconstruction, especially using a free flap. A robot can assist the operator in insetting the flap at a deep portion of the oropharynx without the need to perform a traditional mandibulotomy. Robot-assisted reconstruction may substitute for existing surgical methods and is accepted as the most up-to-date method.