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Pham, Vuong-Hung,Yook, Se-Won,Lee, Eun-Jung,Li, Yuanlong,Jeon, Gyuran,Lee, Jung-Joong,Kim, Hyoun-Ee,Koh, Young-Hag Chapman and Hall ; Kluwer Academic Publishers 2011 Journal of materials science, Materials in medicin Vol.22 No.10
<P>This study reports the deposition of TiN films on Co-Cr substrates to improve the substrates' mechanical properties and biological properties. In particular, the argon to nitrogen (Ar:N(2)) gas flow ratio was adjusted to control the microstructure of the TiN films. A Ti interlayer was also used to enhance the adhesion strength between the Co-Cr substrate and TiN films. A series of TiN films, which are denoted as TiN-(Ar/N(2))1:1, Ti/TiN-(Ar/N(2))1:1, and Ti/TiN-(Ar:N(2))1:3, were deposited by reactive DC sputtering. All the deposited TiN films showed a dense, columnar structure with a preferential orientation of the (200) plane. These TiN films increased the mechanical properties of Co-Cr, such as the critical load during scratch testing, hardness, elastic modulus and plastic resistance. In addition, the biological properties of the Co-Cr substrates, i.e. initial attachment, proliferation, and cellular differentiation of the MC3T3-E1 cells, were improved considerably by deposition of the TiN films. These results suggest that TiN films would effectively enhance both the mechanical properties and biocompatibility of biomedical Co-Cr alloys.</P>
Pham, Hiep-Hung,Vuong, Quan-Hoang,Dong, Thi-Kieu-Trang,Nguyen, Tien-Trung,Ho, Manh-Toan,Vuong, Thu-Trang,Hoang, Anh-Duc,Nguyen, Mai-Huong World Association for Triple Helix and Future Stra 2021 Journal of Contemporary Eastern Asia Vol.20 No.1
Traditionally, students from the Southern world tend to cross their national borders to study abroad. However, in recent times, we have observed a trend in which more and more students, both full-time and short-term, select Southern countries as destinations for overseas education. This paper contributes to the sparse literature on the above phenomenon, examining the case of Vietnam. We surveyed 50 universities and colleges about their international student profiles (including statistics and nationalities) and their strategies for attracting international students. The findings of this study provide implications for Vietnam's policymakers and university/college leaders and other Southern countries when implementing the internationalization of tertiary education.
Adhesion of Human Osteoblasts Cell on TiN Thin Film Deposited by Cathodic Arc Plasma Deposition
Vuong Hung Pham,Sun Kyu Kim,Vinh Van Le,Byoung Se Kwon 한국표면공학회 2008 한국표면공학회지 Vol.41 No.6
Interaction between human osteoblast and TiN films was conducted in vitro. TiN films were produced by cathodic arc plasma deposition. The surface was characterized by atomic force microscopy (AFM). TiN films, glass substrates and Ti films were cultured with human osteoblasts for 48 and 72 h hours. Actin stress fiber patterns and microtubules of osteoblasts were found slightly more organized and distributed on TiN films compared to those on the Ti films and the glass substrates. Human osteoblasts also showed slightly higher cell attachment, proliferation, and focal contact adhesion on TiN films compared to those on Ti films and glass substrates. Our results demonstrated that TiN films showed slightly better cellular adhesion of osteoblasts than Ti films and glass substrates in a short-time culture period.
Adhesion of Human Osteoblasts Cell on CrN Thin Film Deposited by Cathodic Arc Plasma Deposition
Vuong Hung Pham,Sun Kyu Kim 한국표면공학회 2009 한국표면공학회지 Vol.42 No.5
Interaction between human osteoblast (hFOB 1.19) and CrN films was conducted in vitro. CrN films were produced by cathodic arc plasma deposition. The surface was characterized by atomic force microscopy (AFM). CrN films, glass substrates and TiN films were cultured with human osteoblasts for 48 and 72 hours. Actin stress fiber patterns and cell adhesion of osteoblasts were found less organized and weak on CrN films compared to those on the glass substrates and the TiN films. Human osteoblasts also showed less proliferation and less distributed microtubule on CrN films compared to those on glass substrates and TiN films. Focal contact adhesion was not observed in the cells cultured on CrN films, whereas focal contact adhesion was observed well in the cells cultured on glass substrates and TiN films. As a result, the CrN film is a potential candidate as a surface coating to be used for implantable devices which requires minimal cellular adhesion.
Osteoblast Adhesion on Cathodic Arc Plasma Deposited Nano-Multilayered TiCrAlSiN Thin Films
( Sun Kyu Kim ),( Vuong Hung Pham ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.3
Adhesion of osteoblast cells to TiCrAlSiN thin films was evaluated in vitro. Ti and TiCrAlSiN thin films were deposited on glass substrates by cathodic arc deposition. Surface roughness and chemistry of the TiCrAlSiN thin films was characterized by AFM and EPMA, respectively. Ti and TiCrAlSiN thin films and glass coverslips were cultured with human osteoblast cells (hFOB 1.19). The cell cytoskeleton was analyzed by observing the organization of actin stress fibers and microtubules. Cell proliferation was investigated by MTT assay and visualization. Focal contact adhesion was studied by observing the vinculin density. The results indicated that the TiCrAlSiN coating significantly influenced the actin cytoskeleton and microtubule organization. Human osteoblasts hFOB attached and proliferated better on TiCrAlSiN thin films with more focal contact adhesions than on Ti thin films or glass surfaces. These results suggest that TiCrAlSiN thin films can be an implantable material where the maximum cell adhesion is required.
Cell Adhesion on Cathodic Arc Plasma Deposited ZrAlSiN Thin Films
( Sun Kyu Kim ),( Vuong Hung Pham ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.12
Interaction between ZrAlSiN thin films and osteoblasts cells was conducted in vitro. Ti and ZrAlSiN films were deposited on glass coverslips by cathodic arc deposition. Ti, ZrAlSiN thin films and the bare glass coverslips were cultured with human osteoblast cells (hFOB). Cell morphology was observed with a confocal microscope in the bright field mode. Cell viability was assayed by MTT. Cell proliferation was fluorescent visualized at 10 X magnification. Cell cytoskeletons were analyzed by observing actin stress fiber organization. Focal contact adhesion was studied by investigation of the density of the vinculin. Cell viability, cell proliferation, developed actin stress fibers and focal contact adhesion were found better on ZrAlSiN thin films than on Ti thin films or glass surfaces.
Fibroblasts Adhesion and Growth on Cathodic Arc Deposited TiAlSiN Thin Films
( Sun Kyu Kim ),( Vuong Hung Pham ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.3
Fibroblasts adhesion on TiAlSiN thin films were examined in vitro. TiAlSiN thin films were deposited on glass coverslips by cathodic arc plasma deposition. The cell adhesion on the TiAlSiN thin films was studied by cell viability, cell proliferation, microtubule cytoskeleton organization and actin cytoskeleton organization and compared with glass and Ti thin film. The cell viability and proliferation rate were significantly higher on the TiAlSiN thin films than on the glass surfaces and Ti films. Fibroblasts on the TiAlSiN thin films had expanded microtubules and well organized actin stress fibers, indicating effective cell adhesion. This study suggests that TiAlSiN coatings might be suitable to support tissue growth on implant surfaces.
Phuong Dinh Tam,Nguyen Luong Hoang,Hoang Lan,Pham Hung Vuong,Ta Thi Nhat Anh,Tran Quang Huy,Nguyen Thanh Thuy 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.10
In this work, we evaluated the effects of different antibody immobilization strategies on the response of a CeO2-nanowires (NWs)-based immunosensor for V ibrio cholerae O1 detection. Accordingly, the changes in the electron-transfer resistance (Ret) from before to after cells bind to an antibody-modified electrode prepared by using three different methods of antibody immobilization were determined. The values were 16.2%, 8.3%, and 6.65% for the method that utilized protein A, antibodies activated by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC)/Nhydroxysuccinimide (NHS), and absorption, respectively. Cyclic voltammetry confirmed that the change in the current was highest for the immunosensors prepared using protein A (11%), followed by those prepared with EDC/NHS-activated antibodies (9%), and finally, those prepared through absorption (7.5%). The order of the antibody immobilization strategies in terms of resulting immunosensor detection limit and sensitivity was as follows order: absorption (3.2 × 103 CFU/mL; 45.1 /CFU·mL−1) < EDC/NHS-activated antibody (1.0 × 103 CFU/mL; 50.6 /CFU·mL−1) < protein A (1.0 × 102 CFU/mL; 65.8 /CFU·mL−1). Thus, we confirmed that the protein A - mediated method showed significantly high cell binding efficiencies compared to the random immobilization method.
Quang Anh Phan,Manh-Toan Ho,Quan-Hoang Vuong,Hiep-Hung Pham,Minh Huyen Vu,Thi Thu Ha Nguyen,Thanh Thao Thi Phan World Association for Triple Helix and Future Stra 2024 Journal of Contemporary Eastern Asia Vol.23 No.1
The overarching purpose of this study is to examine the current status of academic public engagement in Vietnam. Data were obtained from a survey with 245 university lecturers, and descriptive statistics were used jointly with Bayesian statistics as tools for analysis. This study reveals that a significant proportion of university lecturers are not involved in public engagement, neither through the public press (66.5%) nor social media (49%). Those who have been active in public engagement use the public press and social networks to communicate science, with the latter being more used than the former. In addition, this study also pointed out that experienced scientists tend to engage with the public press, while early-career researchers often choose social networks. The findings of this study provide implications for higher education policymakers and administrators.
Slurry spray coating of carbon steel for use in oxidizing and humid environments
Nguyen, Minh Dat,Bang, Jung Won,Kim, Young Hee,Bin, An Su,Hwang, Kyu Hong,Pham, Vuong-Hung,Kwon, Woo-Teck Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.7
<P><B>Abstract</B></P> <P>Barrier coatings can be used to prevent corrosion of steel in high-temperature applications with oxidizing and humid environments. This study describes the development of a high-performance environmental barrier coating for steel using a slurry spraying process. In this process, a solution or suspension is deposited onto a substrate using air spraying. Parameters such as the pre-treatment of the steel substrates, filler systems, filler volume, and coating thickness were varied to optimize the coatings. The resulting coatings were investigated using thermogravimetric analysis, scanning electron microscopy with X-ray micro analysis, and X-ray diffraction to clarify the possible protective and bonding mechanisms. Finally, oxidation, thermal shock resistance, and humidity resistance tests were performed to evaluate the performance of the developed coating under harsh environments simulating real applications. It was concluded that the developed coatings were appropriate for protecting steels such as those used in steam boiler tube systems in waste incineration plants.</P>