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Deposition of SiCxNy Thin Film as a Membrane Application
Huh,Sung-Min(Sung-Min Huh),Park,Chang-Mo(Chang-Mo Park),Jinho Ahn(Jinho Ahn) 한국마이크로전자및패키징학회 2001 마이크로전자 및 패키징학회지 Vol.8 No.1
SiCxNy film is deposited by electron cyclotron resonance plasma chemical vapor deposition system using SiH_4(5% in Ar), CH₄ and N₂. Ternary phase SiCxNy thin film deposited at the microwave power of 600 W and substrate temperature of 700 contains considerable amount of strong C-N bonds. Change in CH₄flow rate can effectively control the residual film stress, and typical surface roughness of 34.6 (rms) was obtained. Extremely high hardness (3952 Hv) and optical transmittance (95% at 633 nm) was achieved, which is suitable for a LIGA mask membrane application.
Metal stain on monolithic zirconia restoration: A case report
Min-Sang Cha,Sang-Woon Lee,Yoon-Hyuk Huh2,Lee-Ra Cho2,Chan-Jin Park 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.2
In restorative treatment using fixed dental prostheses, dentists should select appropriate restoration material among various types of dental materials. The strength, marginal fit, esthetics, wear resistance, biocompatibility, and cost are important factors in the choice of restoration materials. The present case showed a surface stain on a monolithic zirconia restoration that was due to wear between the monolithic zirconia restoration and the base metal alloy restoration. This phenomenon was confirmed by surface roughness measurement and electron probe micro-analysis.
Microfluidic generation of Prussian blue-laden magnetic micro-adsorbents for cesium removal
Kang, Sung-Min,Rethinasabapathy, Muruganantham,Hwang, Seung Kuy,Lee, Go-Woon,Jang, Sung-Chan,Kwak, Cheol Hwan,Choe, Sang-Rak,Huh, Yun Suk Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.341 No.-
<P><B>Abstract</B></P> <P>Here, we designed and synthesized a recoverable multifunctional adsorbent using a microfluidic reaction system and evaluated the removal performance of the smart adsorbent toward radioactive cesium as a model sample. Prussian blue-laden magnetic micro-adsorbents (PB-MNPs-MAs) with uniform morphology and monodispersity were generated via two-step sequential procedures using a glass capillary microfluidic system, followed by chemical co-precipitation with a high production rate. The cesium removal efficacy of the PB-MNPs-MAs was analyzed based on Langmuir and Freundlich isotherms by controlling adsorption parameters such as adsorbent size, initial cesium concentration, and contact time. The adsorption isotherm of the PB-MNPs-MAs was better fitted to the Langmuir model with a maximum cesium adsorption capacity of 58.73 mg g<SUP>−1</SUP>, which was 40% higher than that of macro-adsorbents in a dynamic magnetic field. This result can be attributed to their large specific area, which increased the kinetic rate of cesium adsorption and achieved saturation within 20 min. Additionally, the PB-MNPs-MAs were recovered from wastewater within 5 s under a static magnetic field, indicating their great potential for magnetic actuation. We believe that our PB-MNPs-MAs can encapsulate nano-functional adsorbents and prevent actuation, making them promising for environmental remediation and especially for removal of radionuclides.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PB-MNPs-MAs were generated in microfluidic device using chemical co-precipitation. </LI> <LI> The prepared PB-MNPs-MAs are monodispersed with uniform morphology. </LI> <LI> PB-MNPs-MAs exhibited high Cs adsorption capacity (58.73 mg g<SUP>−1</SUP>). </LI> <LI> 100% recovery of PB-MNPs-MAs is possible under static magnetic field after Cs adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Min-Jung Kim,Won-Tak Cho,Su-Hyun Hwang,Ji-Hyeon Bae,Eun-Bin Bae,June-Sung Shim,Jong-Eun Kim,Chang-Mo Jeong,Jung-Bo Huh 대한치과보철학회 2023 The Journal of Advanced Prosthodontics Vol.15 No.4
PURPOSE. This prospective clinical study was conducted to evaluate the clinical usefulness of the freely detachable zirconia ball- and spring-retained implant prosthesis (BSRP) through a comparative analysis of screw- and cement-retained implant prosthesis (SCRP). MATERIALS AND METHODS. A multi-center, randomized, prospective clinical study evaluating the clinical usefulness of the detachable zirconia ball- and spring-retained implant prostheses was conducted. Sixty-four implant prostheses in 64 patients were examined. Periodic observational studies were conducted at 0, 3, 6, and 12 months after delivery of the implant prosthesis. Factors such as implant success rate, marginal bone resorption, periodontal pocket depth, plaque and bleeding index, and prosthetic complications were evaluated, respectively. RESULTS. During the 1-year observation period, all implants survived without functional problems and clinical mobility, showing a 100% implant success rate. Marginal bone resorption was significantly higher in the SCRP group than in the BSRP group only at the time of implant prosthesis delivery (P = .043). In all observation periods, periodontal pocket depth was slightly higher in the BSRP group than in the SCRP group, but there was no significant difference (P > .05). The modified plaque index (mPI) scores of both groups were moderate. Higher ratio of a score 2 in modified sulcus bleeding index (mBI) was observed in the BSRP group in the 6- and 12-months observation. CONCLUSION. Within the limitations of this study, the newly developed zirconia ball- and spring-retained implant prosthesis could be considered as an applicable and predictable treatment method along with the existing screw- and cement-retained prosthesis.
Huh, Seong,Suh, Min-Jung,Vien, Vo,Kim, Youngmee,Hwang, Seong-Ju,Kim, Sung-Jin WILEY-VCH Verlag 2009 Small Vol.5 No.10
<B>Graphic Abstract</B> <P>The octahedral [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4−</SUP> ions with various bridging metal ions form well-defined cubic and hexagonal mesostructures (see image) in the presence of liquid-crystal template in formamide. The interaction between the positively charged micellar head groups of the template and the [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4−</SUP> ions is a pure noncovalent electrostatic interaction. These materials are coordination polymers with exceptionally large 1D or 3D potential pores because of the dimension of mesoscale liquid-crystal template. <img src='wiley_img/16136810-2009-5-10-SMLL200801677-content.gif' alt='wiley_img/16136810-2009-5-10-SMLL200801677-content'> </P>
Control of SWNT Dispersion by Block Copolymers with a Side-Chain Polarity Modifier
Sung, Jinwoo,Park, Jae Man,Choi, U-Hyeok,Huh, June,Jung, Bumsuk,Min, Byung Gil,Ahn, Cheol Hee,Park, Cheolmin WILEY-VCH Verlag 2007 Macromolecular Rapid Communications Vol.28 No.2
<P>The dispersion of single-walled carbon nanotubes (SWNTs) in a non-polar solvent is controlled with a series of polystyrene-block-polybutadiene-block-polystyrene (PSBS) block copolymers that contain cholesteryl chloroformate (CC) in side-chains. Esterification of CC with the partially hydroxylated polybutadiene (PB) blocks allows one to tune the polarity of the block copolymers, which decreases with the amount of CC attached. An excellent dispersion of weak polar SWNTs is observed with PSBS that contains a partially hydroxylated PB block. The dispersion is then significantly deteriorated when the amount of non-polar CC moieties increases in the block copolymers. A good dispersion is achieved with a polymer that gives rise to strong SWNT–polymer interactions, which ensures contact of the polymer molecules with the nanotube surface, rather than a good solubility of the polymer dispersant in solvent. The stability of the SWNTs in solution arises from unique needle-like nanowires of the block copolymer aligned perpendicular to the nanotube axis.</P><P> <img src='wiley_img/10221336-2007-28-2-MARC200600669-gra001.gif' alt='wiley_img/10221336-2007-28-2-MARC200600669-gra001'> </P>
Huh, So-Young,Kim, Su-Hyun,Kim, Woojun,Lee, Sang-Hyun,Park, Min Su,Ahn, Suk-Won,Kim, Byung-Jo,Cho, Joong-Yang,Kim, Ho Jin SAGE Publications 2014 Multiple sclerosis journal: clinical and laborator Vol.20 No.4
<P>We investigated the validity of the 2005 and 2010 McDonald magnetic resonance imaging (MRI) criteria for dissemination in space (DIS) to predict the conversion of clinically definite multiple sclerosis (CDMS) in 94 Korean patients with clinically isolated syndromes (CIS). The sensitivity, specificity, accuracy, positive and negative predictive values of the 2005, 2010 McDonald DIS criteria were comparable to those observed in the Caucasian population. This finding suggests that after careful exclusion of alternative explanations, particularly neuromyelitis optica (NMO) and NMO spectrum disorder (NMOSD), both the 2005 and 2010 McDonald DIS criteria are also useful to predict conversion to CDMS in Korean patients with CIS.</P>