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Search Results: 1 - 10 of 21719 matches for " Hyun Kim "
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Continued Fraction Method for Approximation of Heat Conduction Dynamics in a Semi-Infinite Slab  [PDF]
Jietae Lee, Dong Hyun Kim
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.57100

Heat conduction dynamics are described by partial differential equations. Their approximations with a set of finite number of ordinary differential equations are often required for simpler computations and analyses. Rational approximations of the Laplace solutions such as the Pade approximation can be used for this purpose. For some heat conduction problems appearing in a semi-infinite slab, however, such rational approximations are not easy to obtain because the Laplace solutions are not analytic at the origin. In this article, a continued fraction method has been proposed to obtain rational approximations of such heat conduction dynamics in a semi-infinite slab.

A Study on Spatial Distribution and Characteristics of Moving Companies  [PDF]
Dae Hyun Seo, Kabsung Kim
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.83022
Abstract: The purpose of this study is to propose a method of establishing demand zone in the estimation of industrial complex needs. Demand estimates of existing industrial complexes are mainly based on survey method, which leads to excessive or underestimated demand depending on the extracted samples. Therefore, it has been argued that there is a need to analyze what movements the companies actually show. In this study, based on the status of about 450,000 companies included in the Hankyung Business Yearbook, the company DB book in Korea, each company analyzed the movement and the moving area by city, and based on this, the O-D table was created. This study will empirically validate the previous demand of the enterprises and provide information related to the establishment of the demand for the industrial complex in the future, which will contribute to the estimation of the actual demand of the industrial complex.
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 Pilot Study on the Effect of Pelvic Exercise on Standing Balance in Patients with Incomplete Cervical Spinal  [PDF]
Bo-Ra Choi, Ju-Hyun Kim, Junghwan Kim
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.43023

The purpose of this study was to evaluate the effect of pelvic exercise on standing balance in patients with incomplete cervical spinal cord injury for healthy rehabilitation. 11 patients (8 men and 3 women) with levels of incomplete injury between cervical 3 and cervical 6 who were participated in a study measuring the standing balance using an interactive balance system (IBS) before and after pelvic exercise. The index of standing balance after pelvic exercise was significantly lower than before exercise in patients with incomplete cervical cord injury. The greatest improvements were observed in incomplete cervical spinal cord injury with neurologic levels of cervical 3 and 4 with Brown-Sequard syndrome. These results suggest that the pelvic exercise for rehabilitation significantly improved in part standing balance in patients with incomplete cervical spinal cord injury.

A Greener Approach for Synthesis of Functionalized Polyolefins by Introducing Reactive Functionality into Ethylene Copolymers  [PDF]
Wannida Apisuk, Ken Tsutsumi, Hyun Joon Kim, Dong Hyun Kim, Kotohiro Nomura
Green and Sustainable Chemistry (GSC) , 2014, DOI: 10.4236/gsc.2014.43018
Recent successful examples for synthesis of new polyolefins containing (polar) functionalities by adopting the approaches by controlled incorporation of reactive functionalities (and the subsequent introduction of polar functionalities under mild conditions) by coordination polymerization in the presence of transition metal complex catalysts have been described. Related methods (such as direct copolymerization of olefin with polar monomer using living radical or coordination insertion methods) have also been demonstrated for comparison. Our recent efforts for precise synthesis of polyolefins containing polar functionalities by efficient incorporation of reactive functionality by copolymerization of ethylene with nonconjugateddiene (1,7-octadiene, vinylcyclohexene etc.) or divinyl-biphenyl using nonbridged half-titanocene [ex. Cp’TiCl2(O-2,6-iPr2C6H3), Cp’ = C5Me5, tBuC5H4 etc.] catalysts have been introduced.
Essential spectra of quasisimilar ( p,k ) -quasihyponormal operators
An-Hyun Kim,In Hyoun Kim
Journal of Inequalities and Applications , 2006,
Abstract: It is shown that if M C =( A C 0 B ) is an 2×2 upper-triangular operator matrix acting on the Hilbert space ⊕ and if σ e ( ) denotes the essential spectrum, then the passage from σ e ( A )∪ σ e ( B ) to σ e ( M C ) is accomplished by removing certain open subsets of σ e ( A )∩ σ e ( B ) from the former. Using this result we establish that quasisimilar ( p,k ) -quasihyponormal operators have equal spectra and essential spectra.
Essential spectra of quasisimilar -quasihyponormal operators
Kim An-Hyun,Kim In Hyoun
Journal of Inequalities and Applications , 2006,
Abstract: It is shown that if is an upper-triangular operator matrix acting on the Hilbert space and if denotes the essential spectrum, then the passage from to is accomplished by removing certain open subsets of from the former. Using this result we establish that quasisimilar -quasihyponormal operators have equal spectra and essential spectra.
Experimental Demonstration of Masking Phenomena between Competing Odorants via an Air Dilution Sensory Test
Ki-Hyun Kim
Sensors , 2010, DOI: 10.3390/s100807287
Abstract: To simulate the occurrence of masking phenomena with the aid of an air dilution sensory (ADS) test, two types of odorant mixtures were prepared: (1) M2 with two individual odorants [H2S and acetaldehyde (AA)] and (2) M6 with six individual odorants (H2S and five aldehydes). The test results derived for samples containing single individual odorants at a wide range of concentrations are initially used to define the empirical relationship between the dilution-to-threshold (D/T) ratio and odor intensity (OI) scaling. Based on these relationships, the D/T ratios were estimated for each odorant with the same intensity as the synthetic mixture. The relative contribution of each odorant to such mixture is then assessed by comparing the estimated and measured D/T values. This stepwise test confirmed the dominance of certain compounds at a given OI rating. In the case of M2, H2S showed sensitive detection at high OI range, while AA did so at low end. The pattern of a competing relationship is also seen consistently from M6 between AA (low) and iso-valeraldehyde (IA: high OI range). The overall results thus suggest that the masking phenomena between strong odorants should proceed under competing relationships, if released at the same time.
The Averaging Effect of Odorant Mixing as Determined by Air Dilution Sensory Tests: A Case Study on Reduced Sulfur Compounds
Ki-Hyun Kim
Sensors , 2011, DOI: 10.3390/s110201405
Abstract: To learn more about the effects of mixing different odorants, a series of air dilution sensory (ADS) tests were conducted using four reduced sulfur compounds [RSC: hydrogen sulfide (H2S), methanethiol (CH3SH), dimethylsulfide (DMS), and dimethyldisulfide (DMDS)] at varying concentration levels. The tests were initially conducted by analyzing samples containing single individual RSCs at a wide range of concentrations. The resulting data were then evaluated to define the empirical relationship for each RSC between the dilution-to-threshold (D/T) ratio and odor intensity (OI) scaling. Based on the relationships defined for each individual RSC, the D/T ratios were estimated for a synthetic mixture of four RSCs. The effect of mixing was then examined by assessing the relative contribution of each RSC to those estimates with the aid of the actually measured D/T values. This stepwise test confirmed that the odor intensity of the synthetic mixture is not governed by the common theoretical basis (e.g., rule of additivity, synergism, or a stronger component model) but is best represented by the averaged contribution of all RSC components. The overall results of this study thus suggest that the mixing phenomenon between odorants with similar chemical properties (like RSC family) can be characterized by the averaging effect of all participants.
ClustalXeed: a GUI-based grid computation version for high performance and terabyte size multiple sequence alignment
Taeho Kim, Hyun Joo
BMC Bioinformatics , 2010, DOI: 10.1186/1471-2105-11-467
Abstract: We designed ClustalXeed, a software system for multiple sequence alignment with incremental improvements over previous versions of the ClustalX and ClustalW-MPI software. The primary advantage of ClustalXeed over other multiple sequence alignment software is its ability to align a large family of protein or nucleic acid sequences. To solve the conventional memory-dependency problem, ClustalXeed uses both physical random access memory (RAM) and a distributed file-allocation system for distance matrix construction and pair-align computation. The computation efficiency of disk-storage system was markedly improved by implementing an efficient load-balancing algorithm, called "idle node-seeking task algorithm" (INSTA). The new editing option and the graphical user interface (GUI) provide ready access to a parallel-computing environment for users who seek fast and easy alignment of large DNA and protein sequence sets.ClustalXeed can now compute a large volume of biological sequence data sets, which were not tractable in any other parallel or single MSA program. The main developments include: 1) the ability to tackle larger sequence alignment problems than possible with previous systems through markedly improved storage-handling capabilities. 2) Implementing an efficient task load-balancing algorithm, INSTA, which improves overall processing times for multiple sequence alignment with input sequences of non-uniform length. 3) Support for both single PC and distributed cluster systems.Genetic and protein sequences are being discovered rapidly, and as a result, the number of sequences entered into biological databases is growing exponentially over time. Most of the work currently being done in computational biology involves searching for inter- and intra-sequence homology in massive volumes of genetic and protein sequence data, which are commonly based on a multiple sequence alignments (MSAs) [1]. However, increasing the computational efficiency to solve a variety of real MSA
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