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28 results on '"Kim, Yun-Jong"'

1. Modeling Behavior of Mobile Application Using Discrete Event System Formalism

Author

Kim, Yun Jong, Yang, Ji Yong, Kim, Young Min, Lee, Joongsup, Choi, Changbeom, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Liu, Ting, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Ohn, Syng Yup, editor, and Chi, Sung Do, editor

Published
2016
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24. Corrosion Analysis and Apatite Forming Ability of Ti and Ti-Alloys in SBF Solution

Author

Kim Taik-Nam, Choi Je-Woo, Lee Seung-Woo, Kim Won-Soo, Kim Yun-Jong, and Park Joong-Keun

Subjects
Corrosion potential, Materials science, Distilled water, Simulated body fluid, visual_art, Metallurgy, visual_art.visual_art_medium, General Materials Science, Polarization (electrochemistry), Apatite, Corrosion
Abstract

Ti and Ti alloys are known to have excellent corrosion properties, which is an important aspect for biocompability of these implants in human body. In our study, four types of samples (Cp-Ti, Ti-6Al-4V, Fe-Ti and ECAP Ti) were tested for their apatite forming ability and corrosion properties. The micropolished samples were treated with 5M NaOH solution at for 24 hours. Each samples was gently washed with distilled water and heat-treated at 600"C for 1 hour. The heat-treated samples were soaked in Simulated Body Fluid (SBF) solution at in an incubator for different period of time. The test revealed that Fe-Ti showing faster apatite growth on the surface (7th day) compared to other samples. Polarization curve test (PCT) was also carried out to determine the corrosion resistance of each samples in SBF solution. ECAP-Ti showed highest corrosion resistance compared to any other samples. showed higher corrosion potential and corrosion current compared to other samples.

Published
2005

25. Microstructure and corrosion behavior of various grain size Cp-Ti

Author

Kim Won-Soo, Kim Taik-Nam, Kim Yun-Jong, Park Joong-Keun, Lee Seung-Woo, and Ruy Jae-Gyeoung

Subjects
Materials science, chemistry, Annealing (metallurgy), Simulated body fluid, Vickers hardness test, Metallurgy, Titanium alloy, chemistry.chemical_element, General Materials Science, Microstructure, Grain size, Corrosion, Titanium
Abstract

Titanium and Titanium alloys are widely used as an orthopedic and dental implant material because of their excellent biocompatibility and mechanical strength. In this study, ECAP Cp-Ti and Cp-Ti were heat treated for different annealing time of 30 min, 90 min and 3 hours. The grain size for each condition was studied. The micro-Vicker hardness test was carried out f3r each different heat treated samples. The micro-Vicker hardness test for ECAP Cp-Ti, Cp-Ti and Cp-Ti (3hr) revealed hardness values of 239.5, 182 and 144 Hv, respectively. The grain size was increased from approximately with the increase in heat treatment time from 30 min to 3 hours. The heat treated samples were tested for their biocompatibility in simulated body fluid (SBF) and corrosion rates was determined using Polarization Curve test (PCT). The PCT results showed Cp-Ti with comparatively high corrosion potential of -0.18 V and corresponding corrosion current of A, while the corrosion rate in ECAP Cp-Ti and Cp-Ti (30 min annealed) showed very similar results of corrosion potential about -0.47 V with corresponding corrosion current of A.

Published
2005

28. Effects of Heat Treatment on Apatite Formation of CaO-SiO2-PEEK Composites

Author

Cho, Sung Baek, An, Eung Mo, Lee, Sujeong, Jang, Hee Dong, Kim, Ill Yong, Ohtsuki, Chikara, and Kim, Yun Jong

Abstract

Osteoconductive bone-repairing materials with mechanical properties analogous to those of human bone can be prepared through the combination of an osteoconductive ceramic filler with an organic polymer. Osteoconduction is archived from apatite formation on substrates. Previously, we reported that novel osteoconductive spherical particles in a binary CaO-SiO2 system were produced through a sol-gel process as ceramic filler for the fabrication of composites. In this study, we fabricated the composites consisting of polyetheretherketone (PEEK) and 30CaO·70SiO2 (CS) spherical particles and evaluated the effects of heat treatment in the range of 320-360 °C on apatite formation of the composites in a simulated body fluid. The prepared composites of PEEK and CS particles form hydroxyapatite on their surfaces in the simulated body fluid. The induction periods of hydroxyapatite on the composites decreased with increasing the amount of CS particles and decreasing the temperature for heat treatment. The apatite formation was affected by exposure of ceramic filler on the polymer matrix.

Published
2012
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