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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.
Han-Gyeol, Yeom,Byung-Do, Lee Korean Academy of Oral and Maxillofacial Radiology 2022 Imaging Science in Dentistry Vol.52 No.-
McCune-Albright syndrome (MAS) is a rare multisystem disorder characterized by a clinical triad of polyostotic fibrous dysplasia (FD), skin pigmentation, and hyperfunctioning endocrinopathies. A 42-year-old man visited our medical hospital for the treatment of intermittent headaches and was diagnosed with MAS with acromegaly. This patient showed various clinical features of MAS, including pituitary adenoma, polyostotic FD, and hypogonadotropic hypogonadism. The FD lesions showed characteristic radiographic features, such as widespread, sclerotic bony lesions in the cranial bones, mixed radiolucent-radiopaque multilocular lesions in the mandible, and radiolucent lesions in the axial and appendicular skeleton. Over the years, the patient had been hospitalized multiple times due to accidental bony fractures associated with the fragile bony state of FD. This report presents a retrospective description of a case of MAS, with a review of the relevant literature.
( 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,Kwon, Tae‐,Hyuk,Lee, Joo Yong,Kneafsey, Timothy J. American Geophysical Union 2018 Journal of Geophysical Research: Solid Earth Vol.123 No.4
<P>Depressurization of hydrate-bearing sediments (HBS) can cause the movement of fine particles, and in turn, such fines migration affects fluid flow and mechanical behavior of sediments, ultimately affecting long-term hydrocarbon production and wellbore stability. This study investigated how and to what extent depressurization of HBS causes fines migration using X-ray computed tomography (CT) imaging. Methane hydrate was synthesized in sediments with 10% fines content (FC), composed of sands with silt and/or clay, and the hydrate-bearing samples were stepwisely depressurized while acquiring CT images. The CT images were analyzed to quantify the spatial changes in FC in the host sediment and thus to capture the fines migration during depressurization. It was found that the FC changes began occurring from the hydrate dissociation regions. This confirms that the multiphase flow caused by depressurization accompanies fines migration. Depressurization of HBS with a hydrate saturation of 20-40% caused FC reduction from 10% to 6-9%, and the extent of fines migration differed with the particle sizes of the host sands and the types of fines. It was found that fines migration was more pronounced with coarse sands and with silty fines. Such observed level of FC reduction is estimated to increase sediment permeability by several factors based on the Kozeny-type permeability model. Our results support the notion that the extent of fines migration and its effect on fluid flow behavior need to be assessed in consideration of physical properties of host sediment and fine particles to identify optimum depressurization strategies.</P>
Han-Gyeol Yeom,Jo-Eun Kim,Kyung-Hoe Huh,Won-Jin Yi,Min-Suk Heo,Sam-Sun Lee Korean Academy of Oral and Maxillofacial Radiology 2023 Imaging Science in Dentistry Vol.53 No.-
Purpose: The objective of this study was to propose a method for developing a clinical phantom to reproduce various diseases that are clinically prevalent in the field of dentistry. This could facilitate diverse clinical research without unnecessarily exposing patients to radiation. Materials and Methods: This study utilized a single dry skull, which was visually and radiographically examined to evaluate its condition. Existing lesions on the dry skull were preserved, and other relevant lesions were artificially created as necessary. These lesions were then documented using intraoral radiography and cone-beam computed tomography. Once all pre-existing and reproduced lesions were confirmed by the consensus of 2 oral and maxillofacial radiologists, the skull was embedded in a soft tissue substitute. To validate the process, cone-beam computed tomography scans and panoramic radiographs were obtained of the fabricated phantom. All acquired images were subsequently evaluated. Results: Most lesions could be identified on panoramic radiographs, although some sialoliths and cracked teeth were confirmed only through cone-beam computed tomographic images. A small gap was observed between the epoxy resin and the bone structures. However, 2 oral and maxillofacial radiologists agreed that this space did not meaningfully impact the interpretation process. Conclusion: The newly developed phantom has potential for use as a standardized phantom within the dental field. It may be utilized for a variety of imaging studies, not only for optimization purposes, but also for addressing other experimental issues related to both 2- and 3-dimensional diagnostic radiography.
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.