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Search Results: 1 - 10 of 14368 matches for " Jae Hyuk Do "
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A Comparative Study of Concretes Containing Crushed Limestone Sand and Natural Sand  [PDF]
Yeol Choi, Jae-Hyuk Choi
Open Journal of Civil Engineering (OJCE) , 2013, DOI: 10.4236/ojce.2013.31003

This paper describes the effects of high temperatures on the strength characteristic of crushed limestone sand concrete (CLSC). To compare, natural (river) sand concrete (NSC) and CLSC specimens were exposed to the three different high temperatures. Visual color-change and weight loss were also carefully examined through the tests. The test results indicated that the decreasing rate of compressive strength of CLSC after exposure to high temperature is slightly lower than that of NSC while the splitting tensile strength of CLSC indicated a very similar rate compared to NSC. Therefore, the strength variations of crushed limestone sand concrete after exposal to high temperature can be similarly treated as that of the natural sand concrete. Also it can be seen that the CLSC can use 0.5 power law equation to represent the relationship between compressive and splitting tensile strength before and after exposal to high temperature.

Business Cycle Implication of Exchange Rate-Based Stabilization
Hyuk Jae Rhee
International Journal of Economics and Finance , 2010, DOI: 10.5539/ijef.v2n2p12
Abstract: The purpose of this study is to analyze the business cycle associated with the exchange rate-based inflation stabilization policy. We develop a stochastic dynamic general equilibrium small open economy model characterized by two sectors of economic activities (tradable and non-tradable), imperfect competition and sticky price in the non-tradable sector, a cash in advance constraint for consumption goods, and endogenous labour supply. The model is calibrated and solved numerically to examine the resulting equilibrium dynamics. Result shows that the model can replicate quantitatively the stylized facts of the credible exchange rate-based stabilization programs, the slow convergence of the inflation to the target rate and the sustained expansion of domestic sector. The model can also produce the “boom-recession cycle” and inflation persistence in the case of temporary stabilizations.
Topological Field Theory of Vortices over Closed Kahler Manifolds
Hyuk-jae Lee
Physics , 1993, DOI: 10.1142/S0217751X95002023
Abstract: By dimensional reduction, Einstein-Hermitian equations of n + 1 dimensional closed Kahler manifolds lead to vortex equations of n dimensional closed Kahler manifolds. A Yang-Mills-Higgs functional to unitary bundles over closed Kahler manifolds has topological invariance by adding the additional terms which have ghost fields. Henceforth we achieve the matter (Higgs field) coupled topological field theories in higher dimension.
Topological Field Threories on The Compact Kahler Complex Surfaces
Hyuk-jae Lee
Physics , 1993, DOI: 10.1142/S0217732394000721
Abstract: The structure of topological quantum field theories on the compact Kahler manifold is interpreted. The BRST transformations of fields are derived from universal bundle and the observables are found from the second Chern class of universal bundle.
Effect of Snow, Temperature and Their Interaction on Highway Truck Traffic  [PDF]
Hyuk-Jae Roh, Sandeep Datla, Satish Sharma
Journal of Transportation Technologies (JTTs) , 2013, DOI: 10.4236/jtts.2013.31003

Based on statistical amount of traffic and weather data sets from three weigh-in-motion sites for the study period of from 2005 to 2009, permanent traffic counters and weather stations in Alberta, Canada, an investigation is carried out to study impacts of winter weather on volume of passenger car and truck traffic. Multiple regression models are developed to relate truck and passenger car traffic variations to winter weather conditions. Statistical validity of study results are confirmed by using statistical tests of significance. Considerable reductions in passenger car and truck volumes can be expected with decrease in cold temperatures. Such reductions are higher for passenger cars as compared to trucks. Due to cold and snow interactions, the reduction in car and truck traffic volume due to cold temperature could intensify with a rise in the amount of snowfall. For passenger cars, weekends experience higher traffic reductions as compared to weekdays. However, the impact of weather on truck traffic is generally similar for weekdays and weekends. Interestingly, an increase in truck traffic during severe weather conditions is noticed at one of the study sites. Such phenomenon is found statistically significant. None of the past studies in the literature have presented the possibility of traffic volume increases on highways during adverse weather conditions; which could happen due to shift of traffic from parallel roads with inadequate winter maintenance programs. It is believed that the findings of this study can benefit highway agencies in developing such programs and policies as efficient monitoring of passenger car and truck traffic, and plan for efficient winter roadway maintenance programs.

A case of hypereosinophilic syndrome presenting with intractable gastric ulcers
Tae Young Park, Chang Hwan Choi, Suh Yoon Yang, In Soo Oh, In-Do Song, Hyun Woong Lee, Hyung Joon Kim, Jae Hyuk Do, Sae Kyung Chang, Ah Ra Cho, Young Joo Cha
World Journal of Gastroenterology , 2009,
Abstract: We report a rare case of hypereosinophilic syndrome (HES) presenting with intractable gastric ulcers. A 71-year-old man was admitted with epigastric pain. Initial endoscopic findings revealed multiple, active gastric ulcers in the gastric antrum. He underwent Helicobacter pylori (H pylori) eradication therapy followed by proton pump inhibitor (PPI) therapy. However, follow-up endoscopy at 4, 6, 10 and 14 mo revealed persistent multiple gastric ulcers without significant improvement. The proportion of his eosinophil count increased to 43% (total count: 7903/mm3). Abdominal-pelvic and chest computed tomography scans showed multiple small nodules in the liver and both lungs. The endoscopic biopsy specimen taken from the gastric antrum revealed prominent eosinophilic infiltration, and the liver biopsy specimen also showed eosinophilic infiltration in the portal tract and sinusoid. A bone marrow biopsy disclosed eosinophilic hyperplasia as well as increased cellularity of 70%. The patient was finally diagnosed with HES involving the stomach, liver, lung, and bone marrow. When gastric ulcers do not improve despite H pylori eradication and prolonged PPI therapy, infiltrative gastric disorders such as HES should be considered.
Quality of Life (QOL) in Long-Term Survivors of Osteosarcoma  [PDF]
Jae Do Kim, Jae Man Kwak, So Hak Chung
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.41018

We conducted this study to analyze the quality of life using the SF-36 health questionnaire and the MSTS scores depending on surgical method and the primary site of occurrence. On the surgical method, the limb salvage had more excellent outcomes (60.9) than the amputation (46.3). The tumor prosthetic replacement had notably higher scores (62.5) than any other methods. For the correlation coefficients on the MSTS and SF-36, the Physical Function had the highest degree of correlation. Excellent functions of the extremities would lead to a good quality of life.

A Novel Regulator Couples Sporogenesis and Trehalose Biogenesis in Aspergillus nidulans
Min Ni, Jae-Hyuk Yu
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000970
Abstract: Trehalose is a compatible osmolyte produced by bacteria, fungi, insects and plants to protect the integrity of cells against various environmental stresses. Spores, the reproductive, survival and infection bodies of fungi require high amounts of trehalose for long-term survival. Here, via a gain-of-function genetic screen, we identify the novel regulator VosA that couples the formation of spores and focal trehalose biogenesis in the model fungus Aspergillus nidulans. The vosA gene is expressed specifically during the formation of both sexual and asexual spores (conidia). Levels of vosA mRNA and protein are high in both types of spore. The deletion of vosA results in the lack of trehalose in spores, a rapid loss of the cytoplasm, organelles and viability of spores, and a dramatic reduction in tolerance of conidia to heat and oxidative stress. Moreover, the absence of vosA causes uncontrolled activation of asexual development, whereas the enhanced expression of vosA blocks sporulation, suggesting that VosA also functions in negative-feedback regulation of sporogenesis. VosA localizes in the nucleus of mature conidia and its C-terminal region contains a potential transcription activation domain, indicating that it may function as a transcription factor primarily controlling the late process of sporulation including trehalose biogenesis. VosA is conserved in most fungi and may define a new fungus-specific transcription factor family.
Spin polarized electron transport near the Si/SiO2 interface
Hyuk-Jae Jang,Ian Appelbaum
Physics , 2009, DOI: 10.1103/PhysRevLett.103.117202
Abstract: Using long-distance lateral devices, spin transport near the interface of Si and its native oxide (SiO2) is studied by spin-valve measurements in an in-plane magnetic field and spin precession measurements in a perpendicular magnetic field at 60K. As electrons are attracted to the interface by an electrostatic gate, we observe shorter average spin transit times and an increase in spin coherence, despite a reduction in total spin polarization. This behavior, which is in contrast to the expected exponential depolarization seen in bulk transport devices, is explained using a transform method to recover the empirical spin transit-time distribution and a simple two-stage drift-diffusion model. We identify strong interface-induced spin depolarization (reducing the spin lifetime by over two orders of magnitude from its bulk transport value) as the consistent cause of these phenomena.
Moduli Space Dynamics of a First-Order Vortex System
Dongsu Bak,Hyuk-jae Lee
Physics , 1997, DOI: 10.1016/S0370-2693(98)00600-5
Abstract: The moduli space dynamics of vortices in the Jackiw-Pi model where a non-relativistic Schrodinger field couples minimally to Chern-Simons gauge field, is considered. It is shown that the difficulties in direct application of Manton's method to obtain a moduli-space metric in the first order system can be circumvented by turning the Lagrangian into a second order system. We obtain exact metrics for some simple cases and describe how the vortices respond to an external U(1) field. We then construct an effective Lagrangian describing dynamics of the vortices. In addition, we clarify strong-weak coupling duality between fundamental particles and vortices.
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