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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.
Temperature dependence of the critical points of monolayer MoS2 by ellipsometry
Park, Han Gyeol,Kim, Tae Jung,Kim, Hwa Seob,Yoo, Chang Hyun,Barange, Nilesh S.,Le, Van Long,Kim, Hyoung Uk,Senthilkumar, Velusamy,Le, Chinh Tam,Kim, Yong Soo,Seong, Maeng-Je,Kim, Young Dong Taylor Francis 2016 Applied spectroscopy reviews Vol.51 No.7
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.
Yeom, Han-Gyeol,Park, Won-Jong,Choi, Eun Joo,Kang, Kyung-Hwa,Lee, Byung-Do Korean Academy of Oral and Maxillofacial Radiology 2019 Imaging Science in Dentistry Vol.49 No.4
This report describes 3 cases of cleidocranial dysplasia (CCD) and presents relevant findings on long-term follow-up radiographic images of impacted permanent teeth with delayed eruption. Radiographic images of 3 CCD patients were reviewed retrospectively. These images were mainly composed of panoramic and skull radiographs, and the follow-up periods were 3, 13, and 13 years, respectively. The distinct features revealed by the images were described, and the eruption state of impacted permanent teeth was evaluated. The features common to the 3 cases were multiple supernumerary teeth, the presence of Wormian bone, underdevelopment of the maxilla and the maxillary sinus, and clavicular hypoplasia. The eruption of impacted permanent teeth was not observed without proper dental treatment in adult CCD cases, even after long time periods had elapsed. When proper orthodontic force was applied, tooth movement was observed in a manner not significantly different from the general population.