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Search Results: 1 - 10 of 21642 matches for " Han Cho "
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Numerical Study of Opto-Fluidic Ring Resonators for Biosensor Applications
Han Keun Cho,Jinwoo Han
Sensors , 2012, DOI: 10.3390/s121014144
Abstract: The opto-fluidic ring resonator (OFRR) biosensor is numerically characterized in whispering gallery mode (WGM). The ring resonator includes a ring, a waveguide and a gap separating the ring and the waveguide. Dependence of the resonance characteristics on the resonator size parameters such as the ring diameter, the ring thickness, the waveguide width, and the gap width between the ring and the waveguide are investigated. For this purpose, we use the finite element method with COMSOL Multiphysics software to solve the Maxwell’s equations. The resonance frequencies, the free spectral ranges (FSR), the full width at half-maximum (FWHM), finesse (F), and quality factor of the resonances (Q) are examined. The resonant frequencies are dominantly affected by the resonator diameter while the gap width, the ring thickness and the waveguide width have negligible effects on the resonant frequencies. FWHM, the quality factor Q and the finesse F are most strongly affected by the gap width and moderately influenced by the ring diameter, the waveguide width and the ring thickness. In addition, our simulation demonstrates that there is an optimum range of the waveguide width for a given ring resonator and this value is between ~2.25 μm and ~2.75 μm in our case.
Passive Sensor Based Multiple Objects Tracking and Association Method in Wireless Sensor Networks
Shung Han Cho,Jinseok Lee,Sangjin Hong,WeDuke Cho
International Journal of Distributed Sensor Networks , 2009, DOI: 10.1080/15501320802347553
Abstract: This article presents a method for dynamic data association in wireless sensor networks and addresses the issue of multiple objects tracking. The sensor node used in this article incorporates RFID reader and an acoustic sensor so that two different signals are cooperating for tracking and associating multiple objects. The RFID tag is used for object identification and an acoustic sensor is used for estimating object movements. In the heterogeneous sensor networks, our proposed association method is analyzed with association success, failure, and recovery cases. In addition, 2-dimensional (2D) particle filtering is used for estimating a objects state such as position and velocity. The performance is compared between a single sensor node and multiple sensor nodes in our proposed algorithm. In addition, the association performance with multiple sensor nodes is evaluated as a function of sampling time and object movement behavior. Finally, the effect of the two heterogeneous sensors range difference is analyzed and discussed.
Periodic Disturbance Attenuation in OPC Drum
Hyunki Cho,Donghoon Han,Sungdae Kim
Lecture Notes in Engineering and Computer Science , 2008,
Synthesis of CaO-SiO2 Compounds Using Materials Extracted from Industrial Wastes  [PDF]
Nobuaki Yamaguchi, Yoshiko Masuda, Yoshishige Yamada, Hideaki Narusawa, Cho Han-Cheol, Yukimichi Tamaki, Takashi Miyazaki
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2015, DOI: 10.4236/ojinm.2015.51001
Abstract: Mineral trioxide aggregate (MTA) cement is an attractive material in endodontic dentistry. The purpose of this study was to produce calcium silicate, which is a major component of MTA, from waste materials. A dental alginate impression gel and used chalks were selected and mixed in a suitable ratio (Code: EXP). As a control, CaCO3 and a commercial diatomite were used (Code: CON). Each powder was heated to 850C and 1000C, and then kneaded with water. TG-DTA, compressive tests, SEM observations, elemental mapping analyses, and XRD analyses were performed. TG-DTA indicated that weight reduction of CaCO3 started at 600C, and it completely decomposed on heating at 850C. The strength was affected by the temperature. After heating, CaCO3 was transformed into CaO and/or Ca2SiO4, and Ca(OH)2 was formed by mixing with water. There were no differences between EXP and CON. These data suggested that recycled wastes might be promising MTA sources.
Chemotherapeutic Effect of Withaferin A in Human Oral Cancer Cells  [PDF]
In-Hyoung Yang, Lee-Han Kim, Ji-Ae Shin, Sung-Dae Cho
Journal of Cancer Therapy (JCT) , 2015, DOI: 10.4236/jct.2015.68080
Abstract: Withaferin A (WA) is a bioactive compound derived from a medicinal plant Withania somnifera and has potential therapeutic effects against various types of cancers. The purpose of this study is to investigate an apoptotic effect of WA and identify its molecular target in HSC-3 and HSC-4 human oral cancer cell lines using Trypan blue exclusion assay, DAPI staining and western blotting. WA inhibited cell viability and induced apoptosis in a concentration- or time-dependent manner, as evidenced by induction of nuclear condensation and fragmentation, activation of caspase 3 and poly (ADP-ribose) polymerase (PARP) cleavage. WA-induced apoptosis was partly diminished by Z-VAD, a pancaspase inhibitor. WA also increased Bim and Bax protein in HSC-3 and HSC-4 cells, respectively. These results suggest that WA may be a potential chemotherapeutic drug candidate against human oral cancer.
Magic polarization for optical trapping of atoms without Stark-induced dephasing
Huidong Kim,Hyok Sang Han,D. Cho
Physics , 2013, DOI: 10.1103/PhysRevLett.111.243004
Abstract: We demonstrate that the differential ac-Stark shift of a ground-state hyperfine transition in an optical trap can be eliminated by using properly polarized trapping light. We use the vector polarizability of an alkali-metal atom to produce a polarization-dependent ac-Stark shift that resembles a Zeeman shift. We study a transition from the |2S1/2,F=2,mF=-2> to the |2S1/2,F=1,mF=-1> state of 7Li to observe 0.59+-0.02 Hz linewidth with interrogation time of 2 s and 0.82+-0.06 s coherence time of a superposition state. Implications of the narrow linewidth and the long coherence time for precision spectroscopy and quantum information processing using atoms in an optical lattice are discussed.
Erucin Exerts Anti-Inflammatory Properties in Murine Macrophages and Mouse Skin: Possible Mediation through the Inhibition of NFκB Signaling
Han Jin Cho,Ki Won Lee,Jung Han Yoon Park
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141020564
Abstract: Erucin, an isothiocyanate, is a hydrolysis product of glucoerucin found in arugula and has recently been reported to have anti-cancer properties in various cancer cells. In this study, we assessed the anti-inflammatory effects of erucin and the underlying mechanisms, using lipopolysaccharide (LPS)-stimulated RAW 264.7 murine macrophages and 12- O-tetradecanoylphorbol-13-acetate-treated mouse skin. In RAW 264.7 cells, erucin (2.5, 5 μmol/L) inhibited LPS-induced production of nitric oxide and prostaglandin E 2. Erucin inhibited LPS-induced degradation of the inhibitor of κBα and translocation of p65 to the nucleus and, subsequently, reduced LPS-induced nuclear factor κB (NFκB) DNA binding activities, as well as the transcriptional activity of NFκB, leading to the decreased expression of NFκB-target genes, including tumor necrosis factor-α, interleukin (IL)-6, IL-1β, inducible nitric oxide synthase (iNOS) and cyclooxygenase (COX)-2, as well as transcriptional activity of iNOS and COX-2. In mice, erucin (100, 300 nmoles) treatment significantly inhibited phorbol ester-induced formation of ear edema and expression of iNOS and COX-2 proteins. These results indicate that erucin exerts a potent anti-inflammatory activity by inhibiting the pro-inflammatory enzymes and cytokines, which may be mediated, at least in part, via the inhibition of NFκB signaling.
On the Set of Indices of Convergence for the Class of s-Cycle Boolean Matrices

Han Hyuk Cho,Suh Ryung Kim,
,Han Hyuk Cho,Suh Ryung Kim

数学物理学报(A辑) , 2006,
Abstract: Using Boolean arithmetic, the index of convergence and period of a Boolean matrix A are respectively the least non-negative integer k and the least positive integer p respectively such that Ak=Ak+p. The knowledge about the period is quite completed. Given positive integers n and s satisfying acertain inequality, the authors apply combinatorial arguments to determinewhich numbers are attainable as the indices of convergence ofn× n Boolean matrices whose digraphs contain at least one s-cycle.
Effects of Topographic Slopes on Hydrological Proecsses and Climate
Jinliang Liu,Han-Ru Cho,
Jinliang Liu
,Han-Ru Cho

大气科学进展 , 2001,
Abstract: Based on previous research results on river re-distribution models, a modification on the effects of topographic slopes for a runoff parameterization was proposed and implemented to the NCAR's land sur- face model (LSM). This modification has two aspects firstly, the topographic slopes cause outflows from higher topography and inflows into the lower topography points; secondly, topographic slopes also cause decrease of infiltration at higher topography and increases of infiltration at lower topography. Then changes in infiltration result in changes in soil molsture, surface fluxes and then in surface temperature, and eventual- ly in the upper atmosphere and the climate. This mechanism is very clearly demonstrated in the point bud- gets analysis at the Andes Mountains vicinities. Analysis from a regional scale perspective in the Mackenzie GEWEX Study (MAGS) area, the focus of the ongoing Canadian GEWEX program, shows that the modi- fied runoff parameterization does bring significant changes in the regional surface climate More important- ly, detailed analysis from a global perspective shows many encouraging improvements introduced by the modified LSM over the original model in simulating basic atmospheric climate properties such as thermodynamic features (temperature and humidity). All of these improvements in the atmospheric climate simulation illustrate that the inclusion of topographic effects in the LSM can force the AGCM to produce a more realistic model climate.
Real-Time Target Detection Architecture Based on Reduced Complexity Hyperspectral Processing
Kyoung-Su Park,Shung Han Cho,Sangjin Hong,We-Duke Cho
EURASIP Journal on Advances in Signal Processing , 2008, DOI: 10.1155/2008/438051
Abstract: This paper presents a real-time target detection architecture for hyperspectral image processing. The architecture is based on a reduced complexity algorithm for high-throughput applications.We propose an efficient pipelined processing element architecture and a scalable multiple-processing element architecture by exploiting data partitioning. We present a processing unit modeling based on the data reduction algorithm in hyperspectral image processing and propose computing structure, that is, to optimize memory usage and eliminates memory bottleneck. We investigate the interconnection topology for the multipleprocessing element architecture to improve the speed. The proposed architecture is designed and implemented in FPGA to illustrate the relationship between hardware complexity and execution throughput of hyperspectral image processing for target detection.
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