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Search Results: 1 - 10 of 21460 matches for " Won Kim "
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An Iterative Algorithm for Generalized Mixed Equilibrium Problems and Fixed Points of Nonexpansive Semigroups  [PDF]
Jong Kyu Kim, Salahud din, Won Hee Won Hee
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.52025
In this works, by using the modified viscosity approximation method associated with Meir-Keeler contractions, we proved the convergence theorem for solving the fixed point problem of a nonexpansive semigroup and generalized mixed equilibrium problems in Hilbert spaces.
A Probabilistic Method of Characterizing Transit Times for Quantum Particles in Non-Stationary States  [PDF]
Hae-Won Kim, Karl Sohlberg
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48145

We present a probabilistic approach to characterizing the transit time for a quantum particle to flow between two spatially localized states. The time dependence is investigated by initializing the particle in one spatially localized “orbital” and following the time development of the corresponding non-stationary wavefunction of the time-independent Hamiltonian as the particle travels to a second orbital. We show how to calculate the probability that the particle, initially localized in one orbital, has reached a second orbital after a given elapsed time. To do so, discrete evaluations of the time-dependence of orbital occupancy, taken using a fixed time increment, are subjected to conditional probability analysis with the additional restriction of minimum flow rate. This approach yields transit-time probabilities that converge as the time increment used is decreased. The method is demonstrated on cases of two-state oscillations and shown to produce physically realistic results.

Effects of Noncircular Inlet on the Flow Structures in Turbulent Jets  [PDF]
Won Hyun Kim, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.16008

Turbulent jet flows with noncircular nozzle inlet are investigated by using a Reynolds Stress Model. In order to analyze the effects of noncircular inlet, the cross section of inlet are selected as circular, square, and equilateral triangular shape. The jet half-width, vorticity thickness, and developments of the secondary flow are presented. From the result, it is confirmed that the secondary flows of square and equilateral triangular nozzle are more vigorous than that of the circular jet. This development of secondary flows is closely related to the variations of vortical motions in axial and azimuthal directions.

A Study on the Wave Screening Effectiveness According to Trench Dimensions Using Ultrasonic Waves  [PDF]
Hee Seok Kim, Won Jong Chin
Engineering (ENG) , 2014, DOI: 10.4236/eng.2014.610061
Abstract: In this study numerical and experimental studies are conducted to examine the wave screening effectiveness of trenches. The numerical study relies on the finite element model of a sandbox with Lysmer-Kuhlemeyer absorbing boundaries. This model is used to examine the screening ef-fectiveness of trench studied for different trench dimensions and distances from the source and receiver to the trench. The results of the numerical analysis are compared with the results of the ultrasonic experiment performed on an acrylic block drilled with a rectangular cut. The comparison shows that the screening effectiveness of the trench is nearly equal if the depth of trench is larger than 60% of the surface wave length. It is also shown that if the distance between the trench and the source is longer than twice the surface wave length, the thickness of the trench does not affect the screening effectiveness.
Development and Evaluation of Korean Nurses’ Core Competency Scale (KNCCS)  [PDF]
Won-Hee Lee, Sanghee Kim, Jihyoun An
Open Journal of Nursing (OJN) , 2017, DOI: 10.4236/ojn.2017.75045
Abstract: Purpose: The purpose of this study was to develop and evaluate a Korean Nurses’ Core Competency Scale (KNCCS). Methods: This methodological research was conducted over two major steps. The first step involved developing a preliminary 70-item KNCCS based on an extensive literature review and the standards and criteria proposed by the Korean Accreditation of Nursing. The second step involved evaluating validity and reliability of the KNCCS. 528 newly graduated nurses recently employed in nine major hospitals were participated in this research for validation. Results: The final KNCCS consisted of 70 items. The exploratory factor analysis identified five subscales under which each item could be categorized: 1) human understanding and communication skills; 2) professional attitudes; 3) critical thinking and evaluation; 4) general clinical performance; and 5) specific clinical performance. Conclusion: The KNCCS shows good reliability and validity. However, the test of both criterion and construct validity were recommended further.
Dirac Coupled Channel Analyses of Proton Inelastic Scatterings from s-d Shell Nuclei  [PDF]
Sugie Shim, Moon-Won Kim, Young-You Kim
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.34056

Proton inelastic scatterings from several s-d shell nuclei are analyzed using optical potential model and collective model in Dirac coupled channel formalism. The optical potential parameters obtained phenomenologically for the scatterings from the s-d shell nuclei are compared with each other for systematic Dirac analysis. Dirac equations are reduced to the second-order differential equations in order to obtain the Schroedinger equivalent effective central and spin-orbit optical potentials, and the surface-peaked phenomena are observed at the real effective central potentials for the scatterings from 22Ne, 20Ne and 24Mg. By analyzing the obtained effective spin-orbit potentials, it is confirmed that the spin-orbit interaction is a surface-peaked interaction. The first-order rotational collective models are used to describe the low-lying excited states of the ground state rotational bands in the s-d shell deformed nuclei, and the obtained deformation parameters are analyzed by comparing with each other, and compared with those obtained by using the nonrelativistic calculations. The obtained deformation parameters of Dirac phenomenological calculations for the s-d shell nuclei are found to agree pretty well with those of the nonrelativistic calculations using the same Woods-Saxon potential shape, even though the theoretical bases are quite different.

Hawking Radiation and Evaporation of the Black Hole Induced by a Klein-Gordon Soliton
Sung-Won Kim,Won T. Kim
Physics , 1995, DOI: 10.1016/0370-2693(95)01139-H
Abstract: A two-dimensional dilatonic black hole induced by a topological soliton is exactly solvable in the scalar field theory coupled to dilaton gravity. The Hawking radiation of the black hole is studied in the one-loop approximation with the help of the trace anomaly of energy-momentum tensors which is a geometrical invariant. The quantum theory can be also soluble in the RST scheme in order to consider the back reaction of the metric. The energy of the black hole system is calculated and the classical thunderpop energy corresponding to the soliton energy is needed to describe the final state of the black hole. Finally we discuss the possibility of conservation of the topological charge.
Effects of Microstructure on the Tensile, Fracture Toughness and Fatigue Behaviour of Gamma Titanium Aluminides
Young- Won,Kim,

材料科学技术学报 , 1994,
Abstract: The effects of microstructure on the deformation and fracture behaviour of two-phase TiAl alloys were investjgated under monotonic and cyclical loading conditions, over a range of temperatu res.The tensile behaviour is analyzed for deformation temperatures between RT and 950℃, Fracture resistance behaviour and toughening mechanisms at RT and 800℃ are analyzed. and the inverse relationship botween ductility and toughness is explained using the crack initiation toughness. The preliminary results of load-controlled fatigue behaviour at 800℃ are interpreted using the tensile behaviour because deformation structure and fracture modes are similar under these two loading conditions
Comparison of Brood Productions in the Cold-Treated Pairing vs. Not Cold-Treated Pairing in a Stenochronous Spider
Kil Won Kim
Journal of Ecology and Field Biology , 2009,
Abstract: To understand whether experience of cold season in reproductive behaviors in the adults ofAmaurobius ferox, the paired adults of a female and a male were exposed under ‘cold-treated environment’ and‘not cold-treated environment’, respectively. I investigated effects of the cold treatment on the brood productionof A. ferox. In not cold treatment in which male-female pairs were formed in October at a temperature of 20℃(± 2℃) and continuously kept under not cold-treated environment, only 3 of 50 pairs successfully reproduced(reproduction was defined as the emergence of spiderlings). In cold treatment where individuals were kept incold conditions for 3 months prior to pair formation, 57 out of 60 couples succeeded in reproducing. Femaleswhich did not experience the low temperature displayed strong aggressiveness toward males. This behavioralinhibition might the primary barrier to copulation of A. ferox that decrease following a period of low temperature.The reproductive inhibition might help the females to allocate the maximum amount of energy in a givenenvironment to reaching the adult stage and to delay reproduction in unfavorable wintering conditions.
Maternal Body-mass Transfer to Offspring in the Matriphagous Spider, Amaurobius ferox (Amaurobiidae)
Kil Won Kim
Journal of Ecology and Field Biology , 2009,
Abstract: The optimal strategy for semelparous females may involve adjustments in the relative investmentin two fitness components, the number of offspring and the post-hatching investment per capita. To determinethe pattern of maternal resource allocation to offspring in the matriphagous spider, Amaurobius ferox (Amaurobiidae),I investigated the relationship between maternal body-mass and the number of offspring, and quantifiedthe transfer of maternal body-mass to the offspring via different forms of maternal provisioning (trophic egg-layingand matriphagy). There was a positive relationship between female body-mass and the number of offspring.However, Amaurobius mothers did not produce more trophic eggs when they had larger broods. Rather, spiderlingsin larger A. ferox broods consumed larger quantities of maternal body-mass via matriphagy. Mothers transferred28.8 ± 6.5% of their body-mass to the spiderlings via trophic egg-laying, and an estimated 39.0 ± 12.5%of their body-mass was transferred to the spiderlings via matriphagy.
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