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Search Results: 1 - 10 of 22197 matches for " Tae Hyun Kim "
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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
Abstract:

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.

Chair-rising and 3-min walk: A simple screening test for functional mobility  [PDF]
Tae-Woong Oh, Izumi Tabata, Jin-Hwan Kim, Tae-Hyun Lee, Tatsuki Naka
Open Journal of Preventive Medicine (OJPM) , 2012, DOI: 10.4236/ojpm.2012.21013
Abstract: Aging induces decrease of locomotor capacity and its decrease is associated with an increased risk of falls. Several lines of evidence indicate that both change in muscle power and aerobic fitness are causative. Mobility tests are usually based on a maximal exercise stress test; however, this test is often difficult and sometimes frightening to older persons. Therefore, the objective of this study was to examine age and gender differences in 3-min walk distance test (3WDT), and time of chair-rising test (CRT) of functional mobility. 153 men and 159 women aged from 20 to 78 years were recruited as subjects of the present study. The body composition measured the height, body mass (BM), body mass index (BMI), lean tissue mass (LTM), and waist circumference (WC). The Functional mobility tests measured the peak oxygen uptake (VO2peak), 3WDT, leg extension strength (LES), and times of CRT. Both in men and women, height and BMI, WC decreased and increased, respectively, with age. Height, BM, LTM, WC in men are higher than in women. We found no correlation between ages and 3WDT in women and a significant, negative correlation in men. All parameters of fitness performance were negatively correlated with age. Both in men and women, all parameters of fitness performance were positively correlated with sex. Both in men and women, VO2peak, 3WDT, and LES decreased with age. All parameters of fitness performance in men are higher than in women. Both in men and women were observed for the correlation between 3WDT and VO2peak, LES and CRT respectively. Although as the correlation coefficient between 3WTD and VO2peak, LES and CRT were low (r = 0.28 - 0.38), an error may occur, this study shows that 3WDT and CRT test can be a feasible method of providing the information for muscle power and aerobic fitness, possibly avoiding the need for a maximal stress test.
Development of Advanced Radiation Resistant ODS Steel for Fast Reactor System Applications  [PDF]
Tae Kyu Kim, Sanghoon Noh, Suk Hoon Kang, Hyun Ju Jin, Ga Eon Kim
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33C019
Abstract:

A sodium-cooled fast reactor (SFR) is being developed at the Korea Atomic Energy Research Institute (KAERI). As in-core structural material for a SFR, advanced radiation resistant ODS steel (ARROS) has been developed. This paper summarizes the current status of ARROS development regarding an ODS steel composition, fabrication technology of ODS steel structural components and key joining technologies of ODS steel structural components.

Treatment of intractable orbital implant exposure with a large conjunctival defect by secondary insertion of the implant after preceding dermis fat graft
Hyun Kyung Kim,Tae Yoon La
International Journal of Ophthalmology , 2013, DOI: 10.3980/j.issn.2222-3959.2013.02.17
Abstract: AIM:To report a procedure and results of a two-stage operation to manage intractable extensive orbital implant exposure with a large conjunctival defect which was difficult to treat with dermis fat grafts due to repeated graft necrosis. METHODS:A retrospective chart review of four patients who had extensive orbital implant exposures with large conjunctival defects and had past histories of repeated autologous or preserved dermis graft failures was done. As a first-stage operation, the problematic pre-existing orbital implants were removed and autologous dermis fat grafts alone were performed on the defect area. Four months later, new orbital implants were secondarily inserted after confirmation of graft survival. The size of the conjunctival defects and state of the extraocular muscles were checked preoperatively. Success of the operations and complications were investigated. RESULTS:The mean size of the conjuctival defects was 17.3mm×16.0mm, and the mean time from the initial diagnosis of orbital implant exposure to implant removal and autologous dermis fat graft was 20.8 months. After implant removal and autologous dermis fat graft, no graft necrosis was observed in any patients. Also, implant exposure or fornix shortening was not observed in any patients after new orbital implant insertion. CONCLUSION:The secondary insertion of a new orbital implant after pre-existing implant removal and preceding dermis fat graft is thought to be an another selective management of intractable orbital implant exposure in which dermis fat grafts persistently fail.
Statistical Entropy and AdS/CFT Correspondence in BTZ Black Holes
Seungjoon Hyun,Won Tae Kim,Julian Lee
Physics , 1998, DOI: 10.1103/PhysRevD.59.084020
Abstract: We study AdS/CFT correspondence in the case of AdS3. We obtain the statistical entropy of the BTZ black hole in terms of the correct central charge and the conformal dimensions for the states corresponding to the BTZ black hole. We point out the difference between our method and the old fashioned approaches based on SL(2,R) Wess-Zumino-Witten model or Liouville theory.
Generalized Video Deblurring for Dynamic Scenes
Tae Hyun Kim,Kyoung Mu Lee
Computer Science , 2015,
Abstract: Several state-of-the-art video deblurring methods are based on a strong assumption that the captured scenes are static. These methods fail to deblur blurry videos in dynamic scenes. We propose a video deblurring method to deal with general blurs inherent in dynamic scenes, contrary to other methods. To handle locally varying and general blurs caused by various sources, such as camera shake, moving objects, and depth variation in a scene, we approximate pixel-wise kernel with bidirectional optical flows. Therefore, we propose a single energy model that simultaneously estimates optical flows and latent frames to solve our deblurring problem. We also provide a framework and efficient solvers to optimize the energy model. By minimizing the proposed energy function, we achieve significant improvements in removing blurs and estimating accurate optical flows in blurry frames. Extensive experimental results demonstrate the superiority of the proposed method in real and challenging videos that state-of-the-art methods fail in either deblurring or optical flow estimation.
Effect of Hole Size on Flow Structure and Mixing Characteristic in a Multi-Hole Baffled Micro Combustor  [PDF]
Won Hyun Kim, Young Su Park, Seon Myeong Park, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.51002
Abstract:
Flow structure and mixing properties by the baffle shape are numerically studied for a baffled micro combustor. The baffle shape is changed by various fuel and hole sizes. The numerical simulations based on different geometric conditions are performed by using the Reynolds Stress Model. The fuel-air mixing is greatly affected by flow recirculations. The centrally located flow recirculation has an important role for the entire mixing performance. The results show that this feature depends on the baffle configurations, and the baffle with small air holes represents efficient characters.
The Graduate Law Degree Holders in the Legal Education Market: Evidence from the US, Rankings and Implications  [PDF]
Kiyoung Kim, Shahin Borhanian, Koo-Tae Chung, Yong-Hyun Park, Won-Sang Lee, Jae-Hyung Kim
Beijing Law Review (BLR) , 2016, DOI: 10.4236/blr.2016.74031
Abstract: Given that the law is helpful, essential and non-separable with our lives, we surely would like to know the people that make laws and who practice in the legal profession. This query is the recent theme we have pursued in this and other related projects. The investigation has revealed a knowledge economy (savoir-faire) that has entwined law and the actions of law people, which growingly became edged to explain their behavior and moral and professional conduct. The expectation has been that graduate law classes are for foreign lawyers who would return to their home country to work as international lawyers or as professors. That has long been deemed as a given; but the precise reality has not been previously unraveled. With this backdrop, the current paper purports to survey the status and performance of graduate law degree holders in US law school, to rank global law schools, and explore the implications and findings concerning the processes and outcomes of their missions.
Electrochemical Investigation of Anthraquinone-Based Chemodosimeter for Cu2+ Metal Ion
Yeo Woon Yoon,Jong Seung Kim,Tae Hyun Kim
Journal of Chemistry , 2013, DOI: 10.1155/2013/830981
Abstract: The electrochemical properties of an anthraquinone-containing Cu2+-promoted desulfurization chemodosimeter (AQCD) in the presence of various metal ions were investigated by voltammetry. AQCD showed voltammetric changes toward divalent metal ions (M2+), which are similar to those of anthraquinone (AQ) and 1-aminoanthraquinone (AQNH2) with the metal ions except Cu2+. This can be explained on the electrostatic interaction (AQCD-M2+) and chemodosimetric reaction (AQCD-Cu2+). 1. Introduction Chemodosimeters are used for sensing an analyte through a usually rapid response, highly selective, and irreversible chemical reaction between dosimeter molecule and the target material, leading to an observable signal [1–5]. Most have been utilized as optical sensors to monitor the target by UV/Vis and fluorescence spectroscopic measurements [1, 2]. These methods are usually sensitive, easy to perform, and inexpensive, but they have limitations in portability and mobility in terms of practical sensor devices. Alternatively, analytical techniques based on electrochemical detection are suitable for the development of convenient, sensitive, selective, and low cost tools that could be exploited for rapid monitoring, ultimately applicable to hand-held or autonomous operation. However, only a few examples of electrochemical sensors using chemodosimeters have been reported [6–11]. These studies utilized ferrocene [6, 7], iridium(III) complex [8, 9], and pyridine-4-thione [10] as redox units. Previously, we reported an anthraquinone-containing chemodosimeter (AQCD) responsible for Cu2+ ion-induced desulfurization to exhibit highly selective UV and fluorescence changes (Scheme 1) [12]. Scheme 1: Anthraquinone-based chemodosimeter (AQCD) and its reaction mechanism upon Cu 2+ ion addition. The anthraquinone unit can serve not only as a chromofluorescent unit but also as a redox center. It has largely proved to be an effective, remarkable and promising redox-signaling unit for electrochemical applications due to its robust electrochemistry [13–15]. Here, we report now the redox properties as well as cation sensing behavior of AQCD in the absence and the presence of alkali, alkaline earth, Cu2+, and other metal ions by voltammetry. The present study aims to investigate the electrochemical influence of various metal ions on AQCD behavior in terms of chemodosimetric reaction confirmed previously by optical methods [12] and consequently to check the feasibility of anthraquinone-based chemodosimeter as an electrochemical sensor for metal ions. In the pursuit of this goal,
Developing Stable Cultivar through Microspore Mutagenesis in ×Brassicoraphanus koranhort, Inter-Generic Allopolyploid between Brassica rapa and Raphanus sativus  [PDF]
Soo-Seong Lee, Byoung Ho Hwang, Tae Yoon Kim, Jeongmin Yang, Na Rae Han, Jongkee Kim, Hyun Hee Kim, Hadassah Roa Belandres
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.86091
Abstract: A stable progeny was developed through induced mutation, using microspore culture, of the hybrid (F1F1) produced by crossing a newly synthesized, unstable allopolyploid (F1) and a stable cultivar, BB#1(F1) in xBrassicoraphanus. An F1F1 plant was subjected to the induced mutation system established during production of BB#1. Morphological characteristics of the progeny such as color, and leaf number and length, differed from those of BB#1. The bolting time of the progeny in spring cropping was very late compared to BB#1, allowing it to be grown to an adult plant in spring. Genomic in situ hybridization analysis of pollen mother cells at prophase I identified 19 bivalents, 10 from Brassica rapa and 9 from Raphanus sativus. The glucoraphenin content was almost identical to that of BB#1. Two cultivars are available in the baemoochae crop now. These results indicate that induced mutation using microspore culture is a viable method of stabilizing intergeneric allopolyploids between B. rapa and R. sativus.
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