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Search Results: 1 - 10 of 264711 matches for " B. K. Cho "
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A Study of Design Optimization Using Response Surface Analysis and Fabricaiton MEMS Probe Tip  [PDF]
K. B. Kim, J. W. Lee, S. J. Ha, Y. K. Cho, M. W. Cho
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.32030

In semiconductor manufacturing process, probe station that is testing equipment is important. Inspection step is for detecting defects on semiconductor before the packaging. Probe card is a part of probe station and contains probe tip that contacts to semiconductor. Through probe tip, it can inspect defects of semiconductor. In this paper, optimization method is used with response surface analysis to design MEMS type probe tip. And fabricating probe tip uses maskless lithography, electro-plating and lapping process.

Weak convergence theorem for Passty type asymptotically nonexpansive mappings
B. K. Sharma,B. S. Thakur,Y. J. Cho
International Journal of Mathematics and Mathematical Sciences , 1999, DOI: 10.1155/s016117129922217x
Abstract: In this paper, we prove a convergence theorem for Passty type asymptotically nonexpansive mappings in a uniformly convex Banach space with Fr chet-differentiable norm.
Biomedical Scientists' Perceptions of Ethical and Social Implications: Is There a Role for Research Ethics Consultation?
Jennifer B. McCormick, Angie M. Boyce, Mildred K. Cho
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004659
Abstract: Background Research ethics consultation programs are being established with a goal of addressing the ethical, societal, and policy considerations associated with biomedical research. A number of these programs are modelled after clinical ethics consultation services that began to be institutionalized in the 1980s. Our objective was to determine biomedical science researchers' perceived need for and utility of research ethics consultation, through examination of their perceptions of whether they and their institutions faced ethical, social or policy issues (outside those mandated by regulation) and examination of willingness to seek advice in addressing these issues. We conducted telephone interviews and focus groups in 2006 with researchers from Stanford University and a mailed survey in December 2006 to 7 research universities in the U.S. Findings A total of 16 researchers were interviewed (75% response rate), 29 participated in focus groups, and 856 responded to the survey (50% response rate). Approximately half of researchers surveyed (51%) reported that they would find a research ethics consultation service at their institution moderately, very or extremely useful, while over a third (36%) reported that such a service would be useful to them personally. Respondents conducting human subjects research were more likely to find such a service very to extremely useful to them personally than respondents not conducting human subjects research (20% vs 10%; chi2 p<0.001). Conclusion Our findings indicate that biomedical researchers do encounter and anticipate encountering ethical and societal questions and concerns and a substantial proportion, especially clinical researchers, would likely use a consultation service if they were aware of it. These findings provide data to inform the development of such consultation programs in general.
Computational study of NMDA conductance and cortical oscillations in schizophrenia
Kübra Komek Kirli,G. B. Ermentrout,Raymond Y. Cho
Frontiers in Computational Neuroscience , 2014, DOI: 10.3389/fncom.2014.00133
Abstract: N-methyl-D-aspartate (NMDA) receptor hypofunction has been implicated in the pathophysiology of schizophrenia. The illness is also characterized by gamma oscillatory disturbances, which can be evaluated with precise frequency specificity employing auditory cortical entrainment paradigms. This computational study investigates how synaptic NMDA hypofunction may give rise to network level oscillatory deficits as indexed by entrainment paradigms. We developed a computational model of a local cortical circuit with pyramidal cells and fast-spiking interneurons (FSI), incorporating NMDA, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic (AMPA), and γ-aminobutyric acid (GABA) synaptic kinetics. We evaluated the effects of varying NMDA conductance on FSIs and pyramidal cells, as well as AMPA to NMDA ratio. We also examined the differential effects across a broad range of entrainment frequencies as a function of NMDA conductance. Varying NMDA conductance onto FSIs revealed an inverted-U relation with network gamma whereas NMDA conductance onto the pyramidal cells had a more monotonic relationship. Varying NMDA vs. AMPA conductance onto FSIs demonstrated the necessity of AMPA in the generation of gamma while NMDA receptors had a modulatory role. Finally, reducing NMDA conductance onto FSI and varying the stimulus input frequency reproduced the specific reductions in gamma range (~40 Hz) as observed in schizophrenia studies. Our computational study showed that reductions in NMDA conductance onto FSIs can reproduce similar disturbances in entrainment to periodic stimuli within the gamma range as reported in schizophrenia studies. These findings provide a mechanistic account of how specific cellular level disturbances can give rise to circuitry level pathophysiologic disturbance in schizophrenia.
First-Principles Calculation of Thermal Transport in the Metal/Graphene System
R. Mao,B. D. Kong,C. Gong,S. Xu,T. Jayasekera,K. Cho,K. W. Kim
Physics , 2013, DOI: 10.1103/PhysRevB.87.165410
Abstract: Thermal properties in the metal/graphene (Gr) systems are analyzed by using an atomistic phonon transport model based on Landauer formalism and first-principles calculations. The specific structures under investigation include chemisorbed Ni(111)/Gr, physisorbed Cu(111)/Gr and Au(111)/Gr, as well as Pd(111)/Gr with intermediate characteristics. Calculated results illustrate a strong dependence of thermal transfer on the details of interfacial microstructures. In particular, it is shown that the chemisorbed case provides a generally smaller interfacial thermal resistance than the physisorbed due to the stronger bonding. However, our calculation also indicates that the weakly chemisorbed interface of Pd/Gr may be an exception, with the largest thermal resistance among the considered. Further examination of the electrostatic potential and interatomic force constants reveal that the mixed bonding force between the Pd and C atoms results in incomplete hybridization of Pd and graphene orbital states at the junction, leading effectively to two phonon interfaces and a larger than expected thermal resistance. Comparison with available experimental data shows good agreement. The result clearly suggests the feasibility of phonon engineering for thermal property optimization at the interface.
Multiple-Set Split Feasibility Problems for Asymptotically Strict Pseudocontractions
Shih-Sen Chang,Yeol Je Cho,J. K. Kim,W. B. Zhang,L. Yang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/491760
Abstract: In this paper, we introduce an iterative method for solving the multiple-set split feasibility problems for asymptotically strict pseudocontractions in infinite-dimensional Hilbert spaces, and, by using the proposed iterative method, we improve and extend some recent results given by some authors.
"Ab initio" studies of hydrogen-enhanced oxygen diffusion in silicon
Capaz, R. B.;Assali, L. V. C.;Kimerling, L. C.;Cho, K.;Joannopoulos, J. D.;
Brazilian Journal of Physics , 1999, DOI: 10.1590/S0103-97331999000400002
Abstract: a novel microscopic mechanism for hydrogen-enhanced oxygen diffusion in p-doped silicon is proposed. a path for joint diffusion of o and h is obtained from an ab-initio molecular dynamics "kick" simulation. the migration pathway consists of a two-step mechanism, with a maximum energy of 1.46 ev. this path represents a 0.54 ev reduction in the static barrier when compared with the diffusion of isolated o in si, in excellent agreement with experiments.
LHC Signature of Mirage Mediation
Cho, W. S.;Kim, Y. G.;Lee, K. Y.;Park, C. B.;Shimizu, Y.
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1126-6708/2007/04/054
Abstract: We study LHC phenomenology of mirage mediation scenario in which anomaly and modulus contributions to soft SUSY breaking terms are comparable to each other. A Monte Carlo study of mirage mediation, with model parameters $\alpha=1$,$ M_0=500$ GeV, $n_M=1/2$, $n_H=1$ and $\rm{tan}\beta=10$, is presented. It is shown that masses of supersymmetric particles can be measured in a model independent way, providing information on SUSY breaking sector. In particular, the mass ratio of gluino to the lightest neutralino for the benchmark scenario is determined to be $1.9 \lesssim m_{\tildeg}/m_{\tilde\chi_1^0} \lesssim 3.1$, well reproducing theoretical input value of $m_{\tilde g}/m_{\tilde\chi_1^0} \simeq 2.5$ which is quite distinctive from the predictions $m_{\tilde g}/m_{\tilde\chi_1^0} \gtrsim 6$ of other SUSY scenarios in which gaugino masses are unified at the GUT scale. The model parameters of mirage mediation can be also determined from various kinematic distributions.
Fixed point theorems for compatible mappings of type (P) and applications to dynamic programming
H. K. Pathak,Y. J. Cho,S. M. Kang,B. S. Lee
Le Matematiche , 1995,
Abstract: In this paper, we prove some common fixed point theorems for compatible mappings of type (P). As applications, the existence and uniqueness of common solutions for a class of the functional equations in dynamic programming are discussed.
Absolute femtosecond measurements of Auger recombination dynamics in lead sulfide quantum dots
Cho B.,Peters W.K.,Tiwari V.,Spencer A.P.
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134104035
Abstract: Multiphoton excitation of hot carriers generates multiexcitons that are probed as a function of the absolute number of photons absorbed. Standard assumptions of Auger recombination analyses fail for an average of 2 excitations.
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