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Nam, Hyo-Jin,Jang, Seong-Soo,Kim, Young-Sik,Lee, Caroline-Sunyong,Jin, Won-Hyeog,Cho, Il-Joo,Bu, Jong-Uk The Institute of Electronics and Information Engin 2005 Journal of semiconductor technology and science Vol.5 No.1
Silicon nitride cantilevers integrated with silicon heaters and piezoelectric sensors were developed for the scanning probe microscope (SPM) based data storage application. These nitride cantilevers are expected to have better mechanical stability and uniformity of initial bending than the previously developed silicon cantilevers. Data bits of 40 nm in diameter were recorded on PMMA film and the sensitivity of the piezoelectric sensor was 0.615 fC/nm, meaning that indentations less than 20 nm in depth can be detected. For high speed operation, $128{\times}128$ cantilever array was developed.
Application study of PCR additives to improve the split peaks in direct PCR
Joo-Young Kim,Da-Hye Kim,Hyun-Chul Park,Ju Yeon Jung,Gang-Nam Jin,In-Kwan Hwang,Pil-Won Kang 한국분석과학회 2019 분석과학 Vol.32 No.4
Analysis techniques using DNA profiling are widely used in various fields including forensic science and new technologies such as the Direct PCR amplification method are being developed continuously in order to acquire the DNA profiles efficiently. However, it has a limits such as non-specific amplification according to the quality of crime scene evidence samples. Especially, split peaks caused by excessive DNA samples are one of the important factors that could cause the debate to allow researchers to interpret the DNA profile results. In this study, we confirmed the occurrence rate of split peaks in each STR (short tandem repeats) locus of the GlobalFilerTM kit and investigated the possibility of improving the split peaks using several PCR additives such as DMSO (dimethylsulfoxide), MgCl2, Betaine and Tween-20. As a result, we could make three groups according to the occurrence rate of split peaks in Direct PCR and it was confirmed that the ratio of split peaks could be reduced by DMSO (87.4 %), MgCl2 (84.5 %) and Betaine (86.1 %), respectively. These results indicate that PCR additives such as DMSO, MgCl2 and Betaine can be improve the split peaks in Direct PCR and thereby facilitate subsequently a successful DNA profile results.
Cosmetics to help Skin Barrier Function
( Nam Gae Won ),( Kim Eun Joo ),( Jeong Choon Bok ) 한국피부장벽학회 2012 한국피부장벽학회지 Vol.14 No.1
Cosmetic products were developed formulation of various ingredients materials. Moisturizers are expected to increase skin hydration and to modify the physical and chemical nature of the surface to one that is smooth, soft, and pliable. Smoothing of the surface can be observed immediately after application of a moisturizer as a result of the filling of spaces between partially desquamated skin flakes, The measurement of hydration in the surface layer of the skin, stratum corneum (SC), gives important information on the biophysical properties and function of the skin barrier such as feeling soft and flexible and looks smooth and healthy. We found the effects of polyols, such as glycerol and butylenes glycol, were influenced directly the hydration increase rate in the SC previously. Most of polyols, glycerol was mainly influenced the hydration. The individual standard curve was obtained on response to glycerol concentrations. The converted glycerol concentrations of products were appeared repetitive and reproducibility. These results suggest that the hydration of the SC standardized regardless of external variation and individual skin condition can explain detailed skin state variation. As evaporation is one of the major physical changes by emulsion, evaporation patterns are especially interesting phenomenon in cosmetic science. In practical interest, evaporation occurs from complex liquid mixtures that applied on the skin and arouses structural and property changes. We developed 11 different parameters for analyzing evaporation of applied emulsion film. To utilize evaporation parameter for practical emulsion development, we tested o/w emulsions. Because conventional o/w emulsion has numerous components, we designed simple formulations for comparative analysis. The results show that different oil type affects evaporation patterns.
On the Stability of Critical Point for Positive Systems and Its Applications to Biological Systems
Joo-Won Lee,Nam Hoon Jo,Hyungbo Shim,Young Ik Son 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.6
The coexistence and extinction of species are important concepts for biological systems and can be distinguished by an investigation of stability. When determining local stability of nonlinear systems, Lyapunov indirect method based on the Jacobian linearization has been widely employed due to its simplicity. Despite such popularity, it is not applicable to singular systems whose Jacobian has at least one eigenvalue that is equal to zero. In such singular cases, an appropriate Lyapunov function should be sought to determine the stability of systems, which is rather difficult and quite involved. In this paper, we seek for a simple criterion to determine stability of the equilibrium that is located at the boundary of the positive orthant, when one of eigenvalues of the Jacobian is zero. The goal of the paper is to present a generalized condition for the equilibrium to attract all trajectories that starting from initial condition in the positive orthant and near the equilibrium. Unlike the Lyapunov direct method, the proposed method requires just a simple algebraic computation for checking the stability of the critical point. Our approach is applied to various biological systems to show the effectiveness of the proposed method.
Nam, Hyun,Kim, Ji-Hye,Kim, Jae-Won,Seo, Byoung-Moo,Park, Joo-Cheol,Kim, Jung-Wook,Lee, Gene Korean Society for Molecular and Cellular Biology 2014 Molecules and cells Vol.37 No.7
Human Hertwig's epithelial root sheath/epithelial rests of Malassez (HERS/ERM) cells are epithelial remnants of teeth residing in the periodontium. Although the functional roles of HERS/ERM cells have yet to be elucidated, they are a unique epithelial cell population in adult teeth and are reported to have stem cell characteristics. Therefore, HERS/ERM cells might play a role as an epithelial component for the repair or regeneration of dental hard tissues; however, they are very rare population in periodontium and the primary isolation of them is considered to be difficult. To overcome these problems, we immortalized primary HERS/ERM cells isolated from human periodontium using SV40 large T antigen (SV40 LT) and performed a characterization of the immortalized cell line. Primary HERS/ERM cells could not be maintained for more than 6 passages; however, immortalized HERS/ERM cells were maintained for more than 20 passages. There were no differences in the morphological and immunophenotypic characteristics of HERS/ERM cells and immortalized HERS/ERM cells. The expression of epithelial stem cell and embryonic stem cell markers was maintained in immortalized HERS/ERM cells. Moreover, immortalized HERS/ERM cells could acquire mesenchymal phenotypes through the epithelial-mesenchymal transition via TGF-${\beta}1$. In conclusion, we established an immortalized human HERS/ERM cell line with SV40 LT and expect this cell line to contribute to the understanding of the functional roles of HERS/ERM cells and the tissue engineering of teeth.
Nam, Yuran,Kim, Hyun Jong,Kim, Young-Mi,Chin, Young-Won,Kim, Yung Kyu,Bae, Hyo Sang,Nam, Joo Hyun,Kim, Woo Kyung The Korean Society of Pharmacology 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.3
Transient receptor potential vanilloid 3 (TRPV3) is a non-selective cation channel with modest permeability to calcium ions. It is involved in intracellular calcium signaling and is therefore important in processes such as thermal sensation, skin barrier formation, and wound healing. TRPV3 was initially proposed as a warm temperature sensor. It is activated by synthetic small-molecule chemicals and plant-derived natural compounds such as camphor and eugenol. Schisandra chinensis (Turcz.) Baill (SC) has diverse pharmacological properties including antiallergic, anti-inflammatory, and wound healing activities. It is extensively used as an oriental herbal medicine for the treatment of various diseases. In this study, we investigated whether SC fruit extracts and seed oil, as well as four compounds isolated from the fruit can activate the TRPV3 channel. By performing whole-cell patch clamp recording in HEK293T cells overexpressing TRPV3, we found that the methanolic extract of SC fruit has an agonistic effect on the TRPV3 channel. Furthermore, electrophysiological analysis revealed that ${\gamma}$-schisandrin, one of the isolated compounds, activated TRPV3 at a concentration of $30{\mu}M$. In addition, ${\gamma}$-schisandrin (${\sim}100{\mu}M$) increased cytoplasmic $Ca^{2+}$ concentrations by approximately 20% in response to TRPV3 activation. This is the first report to indicate that SC extract and ${\gamma}$-schisandrin can modulate the TRPV3 channel. This report also suggests a mechanism by which ${\gamma}$-schisandrin acts as a therapeutic agent against TRPV3-related diseases.
Thermo-Piezoelectric Read/Write Mechanisms for Probe-Based Data Storage
Nam, Hyo-Jin,Kim, Young-Sik,Lee, Sun-Yong,Jin, Won-Hyeog,Jang, Seong-Soo,Cho, Il-Joo,Bu, Jong-Uk The Society of Information Storage Systems 2007 정보저장시스템학회논문집 Vol.3 No.1
In this paper, a thermo-piezoelectric mechanism with integrated heaters and piezoelectric sensors has been studied for low power probe-based data storage. Silicon nitride cantilever integrated with silicon heater and piezoelectric sensor has been developed to improve the uniformity of cantilevers. Data bits of 40 nm in diameter were recorded on PMMA film. The sensitivity of the piezoelectric sensor was 0.615 fC/nm after poling the PZT layer. And, the $34\times34$ probe array integrated with CMOS circuits has been successfully developed by simple one-step bonding process. The process can simplify the process step and reduce tip wear using silicon nitride tip.
( Joo Won Nam ),( Rasika S Phansalkar ),( David C Lankin ),( Jonathan Bisson ),( James B Mcalpine ),( Ariene A Leme ),( Cristina M P Vidal ),( Benjamin Ramirez ),( Matthias Niemitz ),( Ana Bedran Russ 영남대학교 약품개발연구소 2016 영남대학교 약품개발연구소 연구업적집 Vol.26 No.-
The ability of certain oligomeric proanthocya-nidins (OPACs) to enhance the biomechanical properties of dentin involves collagen cross-linking of the 1.3-4.5 nm wide space via protein-polyphenol interactions. A systematic interdisciplinary search for the bioactive principles of pine bark has yielded the trimeric PAC, ent-epicatechin-(4β →S)-epicatechin-(2β→0→7,4β→8)-catechin (3), representing the hitherto most potent single chemical entity capable of enhancing dentin stiffness. Building the case from two congeneric PAC dimers, a detailed structural analysis decoded the stereochemistry, spatial arrangement, and chemical properties of three dentin biomodifiers, Quantum-mechanics-driven <sup>1</sup>H iterative full spin analysis (QM-HiFSA) of NMR spectra distinguished previously unrecognized details such as higher order J coupling and provided valuable information about 3D structure. Detection and quantification of H/D-exchange effects by QM-HiFSA identified C-S and C-6 as (re) active sites, explain preferences in biosynthetic linkage, and suggest their involvement in dentin cross-linking activity. Mapping of these molecular properties underscored the significance of high 8 precision in both <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. Occurring at low- to subppb levels, these newly characterized chemical shift differences in ppb are small but diagnostic measures of dynamic processes inherent to the OPAC pharmacophores and can help augment our understanding of nanometer-scale intermolecular interactions in biomodified dentin macromolecules.