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Search Results: 1 - 10 of 33814 matches for " Dong IL Park "
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Fabrication of Biochips with Micro Fluidic Channels by Micro End-milling and Powder Blasting
Dae Jin Yun,Tae Il Seo,Dong Sam Park
Sensors , 2008, DOI: 10.3390/s8021308
Abstract: For microfabrications of biochips with micro fluidic channels, a large number of microfabrication techniques based on silicon or glass-based Micro-Electro-Mechanical System (MEMS) technologies were proposed in the last decade. In recent years, for low cost and mass production, polymer-based microfabrication techniques by microinjection molding and micro hot embossing have been proposed. These techniques, which require a proper photoresist, mask, UV light exposure, developing, and electroplating as a preprocess, are considered to have some problems. In this study, we propose a new microfabrication technology which consists of micro end-milling and powder blasting. This technique could be directly applied to fabricate the metal mold without any preprocesses. The metal mold with micro-channels is machined by micro end-milling, and then, burrs generated in the end-milling process are removed by powder blasting. From the experimental results, micro end-milling combined with powder blasting could be applied effectively for fabrication of the injection mold of biochips with micro fluidic channels.
Fabrication of Biochips with Micro Fluidic Channels by Micro End-milling and Powder Blasting
Dae Jin Yun,Tae Il Seo,Dong Sam Park
Sensors , 2008,
Abstract: For microfabrications of biochips with micro fluidic channels, a large number of microfabrication techniques based on silicon or glass-based Micro-Electro-Mechanical System (MEMS) technologies were proposed in the last decade. In recent years, for low cost and mass production, polymer-based microfabrication techniques by microinjection molding and micro hot embossing have been proposed. These techniques, which require a proper photoresist, mask, UV light exposure, developing, and electroplating as a preprocess, are considered to have some problems. In this study, we propose a new microfabrication technology which consists of micro end-milling and powder blasting. This technique could be directly applied to fabricate the metal mold without any preprocesses. The metal mold with micro-channels is machined by micro end-milling, and then, burrs generated in the end-milling process are removed by powder blasting. From the experimental results, micro end-milling combined with powder blasting could be applied effectively for fabrication of the injection mold of biochips with micro fluidic channels.
Ferromagnetic resonance spin pumping in CoFeB with highly resistive non-magnetic electrodes
Dong-Jun Kim,Sang-Il Kim,Seung-Young Park,Kyeong-Dong Lee,Byong-Guk Park
Physics , 2014, DOI: 10.1016/j.cap.2014.07.013
Abstract: The relative contribution of spin pumping and spin rectification from the ferromagnetic resonance of CoFeB/non-magnetic bilayers was investigated as a function of non-magnetic electrode resistance. Samples with highly resistive electrodes of Ta or Ti exhibit a stronger spin rectification signal, which may result in over-(or under-)estimation of the spin Hall angle of the materials, while those with low resistive electrodes of Pt or Pd show the domination of the inverse spin Hall effect from spin pumping. By comparison with samples of single FM layer and an inverted structure, we provide a proper analysis method to extract spin pumping contribution.
General and Specific Characteristics of a University-School Partnership: Promoting Learning Opportunities for Students with Deafness or Hearing Impairments
Dong-Joong Kim,Yong Joon Park,Jeong IL Cho,Daesang Kim
International Education Studies , 2013, DOI: 10.5539/ies.v6n1p57
Abstract: The purpose of this article is to identify six key features involved in the development and enhancement of a university-school partnership and to share insights on how these features can be used to promote richer experiential learning opportunities of both university students and young children with deafness or hearing impairments, eventually resulting in synergistic university-school interactions. The key features are categorized into general characteristics which are applicable to many university-school partnerships (shared goals, availability of funding for a highly successful revamped partnership, and inter-impact mechanisms) and specific characteristics for university partnerships with specialized schools (interdisciplinary collaboration, distinct roles, and expertise resources) in the process of building and implementing university-school partnerships. The key features and their implications for the successful future university-school partnerships are discussed in an educational context.
Metabolic syndrome is associated with erosive esophagitis
Jung Ho Park, Dong IL Park, Hong Joo Kim, Yong Kyun Cho, Chong IL Sohn, Woo Kyu Jeon, Byung Ik Kim
World Journal of Gastroenterology , 2008,
Abstract: AIM: To clarify whether insulin resistance and metabolic syndrome are risk factors for erosive esophagitis.METHODS: A case-control study was performed using the database of the Kangbuk Samsung Hospital Medical Screening Center.RESULTS: A total of 1679 cases of erosive esophagitis and 3358 randomly selected controls were included. Metabolic syndrome was diagnosed in 21% of the cases and 12% of the controls (P < 0.001). Multiple logistic regressions confirmed the association between erosive esophagitis and metabolic syndrome (Odds ratio, 1.25; 95% CI, 1.04-1.49). Among the components of metabolic syndrome, increased waist circumference, elevated serum triglyceride levels and hypertension were significant risk factors for erosive esophagitis (all P < 0.01). Furthermore, increased insulin resistance (Odds ratio, 0.91; 95% CI, 0.85-0.98) and fatty liver, as diagnosed by ultrasonography (Odds ratio, 1.39; 95% CI, 1.20-1.60), were also related to erosive esophagitis even after adjustment for a series of confounding factors.CONCLUSION: Metabolic syndrome and increased insulin resistance are associated with an increased risk of developing erosive esophagitis.
An Eccentric Derivation of the Gravitational-Lens Effect  [PDF]
Yoonsoo Bach Park, Il-Tong Cheon
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312245
Abstract:

The gravitational-lens effect is interpreted in the framework of the Newtonian mechanics. Regarding the photon of energy hv as a corpuscle with a tiny mass of mγ=hv/c2. We calculate it's path bended by the gravitational force near the surface of the sun. Effects of dark matter have also been evaluated.

Chemoprophylaxis and the epidemiological characteristics of re-emergent P. vivax malaria in the Republic of Korea
Kim,Changsoo; Shin,Dong Chun; Yong,Tai Soon; Oh,Dae Kyu; Kim,Rock Kwon; Park,Keeho; Suh,Il;
Bulletin of the World Health Organization , 2006, DOI: 10.1590/S0042-96862006001000017
Abstract: objective: in the republic of korea (rok), soldiers stationed where there is a risk of contracting malaria have received antimalarial chemoprophylaxis since 1997. however, chemoprophylaxis may facilitate the development of drug resistance, and late primary attacks in individuals who have received chemoprophylaxis are becoming more frequent. we investigated the association between chemoprophylaxis and the epidemiological characteristics and effectiveness of treatment for re-emergent plasmodium vivax malaria, using a nationwide malaria database. methods: among soldiers at risk of malaria between 1999 and 2001, we reviewed all p. vivax malaria cases (1158) that occurred before 31 december 2003. early and late primary attacks were defined as cases occurring < 2 or > 2 months after the last day of exposure to risk of malaria, respectively. findings: of these cases, 634 (72.0%) had received chemoprophylaxis, and 324 (28.0%) had not. cases occurred mostly in summer, with a peak in july-august. stratification by chemoprophylaxis history revealed different times to onset. early primary attacks were more prevalent in the group not receiving chemoprophylaxis, while in the group receiving chemoprophylaxis most cases were late primary attacks. of the latter, 312 out of 461 (67.7%) did not take primaquine regularly. after treatment of the first attack, 14 (1.2%) of 1158 were re-treated; all re-treated cases were cured using the same doses and regimen used for the first treatment. conclusion: in rok, the increase in late primary episodes of re-emergent p. vivax malaria is associated with the use of antimalarial chemoprophylaxis.
Topological Structure of Dense Hadronic Matter
Byung-Yoon Park,Hee-Jung Lee,Vicente Vento,Joon-Il Kim,Dong-Pil Min,Mannque Rho
Physics , 2004,
Abstract: We present a summary of work done on dense hadronic matter, based on the Skyrme model, which provides a unified approach to high density, valid in the large $N_c$ limit. In our picture, dense hadronic matter is described by the {\em classical} soliton configuration with minimum energy for the given baryon number density. By incorporating the meson fluctuations on such ground state we obtain an effective Lagrangian for meson dynamics in a dense medium. Our starting point has been the Skyrme model defined in terms of pions, thereafter we have extended and improved the model by incorporating other degrees of freedom such as dilaton, kaons and vector mesons.
Unified Approach to Dense Matter
Byung-Yoon Park,Hee-Jung Lee,Vicente Vento,Joon-Il Kim,Dong-Pil Min,Mannque Rho
Physics , 2004, DOI: 10.1016/j.nuclphysbps.2004.12.040
Abstract: We apply the Skyrme model to dense hadronic matter, which provides a unified approach to high density, valid in the large Nc limit. In our picture, dense hadronic matter is described by the classical soliton configuration with minimum energy for the given baryon number density. By incorporating the meson fluctuations on such ground state we obtain an effective Lagrangian for meson dynamics in a dense medium. Our starting point has been the Skyrme model defined in terms of pions, thereafter we have extended and improved the model by incorporating other degrees of freedom such as dilaton, kaons and vector mesons.
Age-Related Characteristics of Multipotent Human Nasal Inferior Turbinate-Derived Mesenchymal Stem Cells
Se Hwan Hwang, Sun Hwa Park, Jin Choi, Dong Chang Lee, Jeong Hoon Oh, Un Cheol Yeo, Sung Won Kim, Dong Il Sun
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074330
Abstract: Background and Objectives Multipotent mesenchymal stem cells (MSCs) represent a promising cell-based therapy for a number of degenerative conditions. Understanding the effect of aging on MSCs is crucial for both autologous therapy development and allogenic donors in older subjects whom degenerative diseases typically afflict. In this study, we investigated the influence of donor age on the characteristics, proliferation, and differentiation potential of in vitro cultures of multipotent human turbinated mesenchymal stem cells (hTMSCs) from patients of various age groups. Subjects and Methods Twelve patients comprised the four age groups: (I) <20 years, (II) 20–39 years, (III) 40–59 years, and (IV) >60 years. Inferior turbinate tissues were discarded from patients undergoing partial turbinectomy. After isolating hTMSCs, the expression of the hTMSC surface markers CD14, CD19, CD34, CD73, CD90, CD105, and HLA-DR was assessed by FACS analysis, and cell proliferation was assessed using a cell counting kit (CCK)-8. The differentiation potential of hTMSCs was evaluated in osteogenic media by histology and determination of osteoblastic gene expression. Results FACS analysis revealed that hTMSCs were negative for CD14, CD19, CD34, and HLA-DR, and positive for CD73, CD90, and CD105, representing a characteristic MSC phenotype, and showed no significant differences among the age groups. Cellular proliferation and osteogenic differentiation potential of hTMSCs also showed no significant differences among the age groups. Conclusions We conclude that donor age does not affect the characteristics, proliferation, and osteogenic differentiation potential of hTMSCs. Donor age may be excluded as a criterion in the guidelines for clinical use of the autologous or allogenic transplantation of hTMSCs.
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