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Search Results: 1 - 10 of 69447 matches for " Kim Y "
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Environmental factors regulating winter CO2 flux in snow-covered boreal forest soil, interior Alaska
Y. Kim,Y. Kodama
Biogeosciences Discussions , 2012, DOI: 10.5194/bgd-9-1129-2012
Abstract: Winter CO2 flux is an important element to assess when estimating the annual carbon budget on regional and global scales. However, winter observation frequency is limited due to the extreme cold weather in sub-Arctic and Arctic ecosystems. In this study, the continuous monitoring of winter CO2 flux in black spruce forest soil of interior Alaska was performed using NDIR CO2 sensors at 10, 20, and 30 cm above the soil surface during the snow-covered period (DOY 357 to 466) of 2006/2007. The atmospheric pressure was divided into four phases: >1000 hPa (HP: high pressure); 985
Adaptive Parallel Computation for Blind Source Separation with Systolic Architecture  [PDF]
H. JEONG, Y. KIM, H. J. JANG
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21006
Abstract: The purpose of Blind Source Separation (BSS) is to obtain separated sources from convolutive mixture inputs. Among the various available BSS methods, Independent Component Analysis (ICA) is one of the representative methods. Its key idea is to repetitively update and calculate the measures. However, dealing with the measures obtained from multi-array sensors causes obstacles for real-time use. In order to solve this problem, it is necessary to convert the software implementation of BSS algorithm into the hardware architecture. Through the use of hardware architecture, the BSS algorithm can efficiently work within a relatively short time. In this study, we investigate a practical method using a parallel algorithm and architecture for hardware use in a blind source separation. We design a feedback network for real-time speech signal processing. The network is composed of forward and updates algorithms. The architecture of the network is systolic and therefore it is suitable for parallel processing. We only have to add and connect modules for scaling. This paper covers the process from the systolic design of BSS to the hardware implementation using Xilinx FPGAs. The simulation results of our proposed implementation are also represented in the experimental section. In that section, our architecture returns satisfying results with robust qualities.
Generalized q-Euler Numbers and Polynomials of Higher Order and Some Theoretic Identities
T. Kim,Y. H. Kim
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/682072
Abstract: We give a new construction of the q-Euler numbers and polynomials of higher order attached to Dirichlet's character χ. We derive some theoretic identities involving the generalized q-Euler numbers and polynomials of higher order.
New identities involving q-Euler polynomials of higher order
Taekyun Kim,Y. H. Kim
Mathematics , 2010, DOI: 10.1134/S1061920810020068
Abstract: In this paper we give new identities involving q-Euler polynomials of higher order.
Analysis of Dynamic Cross Response between Spindles in a Dual Spindle Type Multi-Functional Turning Machine  [PDF]
Y. H. Choi, S. T. Kim, T. Y. Seo, K. H. Kim
Journal of Power and Energy Engineering (JPEE) , 2013, DOI: 10.4236/jpee.2013.17004
Abstract:

In order to meet increasing demand for higher productivity and flexibility, recently many kinds of multi-functional machine tools, which are capable of multiple machining functions or different kinds of machining processes on one machine, have been developed and widely used in manufacturing industries. In this study, a multi-functional turning lathe, which has two spindles and two turrets so that multiple turning operations and various machining processes could be performed simultaneously, has been developed. Furthermore, the equations of correlation between whole responses and cross responses of the two spindles have been derived to examine to what extent the two spindles affect each other’s vibrations.

On the zeros of self-inversive polynomials
Y. Choo,Y. J. Kim
International Journal of Mathematical Analysis , 2013,
Abstract: A classical result due to Cohn states that a self-inversive polynomialhas all its zeros on the unit circle if and only if all the zeros of itsderivative lie in the closed unit disk. A more flexible necessary andsufficient condition than that of Cohn’s was given by Chen. Howeverthose results do not give any information on the simplicity of zeros of aself-inversive polynomial. This paper modifies the above results so thatthey serve as necessary and sufficient conditions for the simplicity aswell as the unimodularity of zeros of a self-inversive polynomial.
Religion and Ethnicity: Theoretical Connections
Rebecca Y. Kim
Religions , 2011, DOI: 10.3390/rel2030312
Abstract: The religion literature in Sociology remains largely disconnected from the ethnicity and immigration literature despite enduring connections between religion and ethnicity. This review helps to close this gap. It shows how the dominant theories in each discipline follow a similar trajectory and examines how exploring the theoretical connections between religion and ethnicity can advance our understanding of each social phenomenon. In particular, it can illuminate why America remains so religious as well as why America’s religious congregations continue to be so divided along ethnic and racial lines.
Clinical potential of sodium-glucose cotransporter 2 inhibitors in the management of type 2 diabetes
Kim Y, Babu AR
Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy , 2012, DOI: http://dx.doi.org/10.2147/DMSO.S22545
Abstract: ical potential of sodium-glucose cotransporter 2 inhibitors in the management of type 2 diabetes Review (3169) Total Article Views Authors: Kim Y, Babu AR Published Date August 2012 Volume 2012:5 Pages 313 - 327 DOI: http://dx.doi.org/10.2147/DMSO.S22545 Received: 13 April 2012 Accepted: 25 May 2012 Published: 31 August 2012 Yoojin Kim, Ambika R Babu Division of Endocrinology, John Stroger Jr Hospital of Cook County and Rush University, Chicago, IL, USA Background: The kidney plays an important role in glucose metabolism, and has been considered a target for therapeutic intervention. The sodium-glucose cotransporter type 2 (SGLT2) mediates most of the glucose reabsorption from the proximal renal tubule. Inhibition of SGLT2 leads to glucosuria and provides a unique mechanism to lower elevated blood glucose levels in diabetes. The purpose of this review is to explore the physiology of SGLT2 and discuss several SGLT2 inhibitors which have clinical data in patients with type 2 diabetes. Methods: We performed a PubMed search using the terms "SGLT2" and "SGLT2 inhibitor" through April 10, 2012. Published articles, press releases, and abstracts presented at national and international meetings were considered. Results: SGLT2 inhibitors correct a novel pathophysiological defect, have an insulin-independent action, are efficacious with glycosylated hemoglobin reduction ranging from 0.5% to 1.5%, promote weight loss, have a low incidence of hypoglycemia, complement the action of other antidiabetic agents, and can be used at any stage of diabetes. They are generally well tolerated. However, due to side effects, such as repeated urinary tract and genital infections, increased hematocrit, and decreased blood pressure, appropriate patient selection for drug initiation and close monitoring after initiation will be important. Results of ongoing clinical studies of the effect of SGLT2 inhibitors on diabetic complications and cardiovascular safety are crucial to determine the risk-benefit ratio. A recent decision by the Committee for Medicinal Products for Human Use of the European Medicines Agency has recommended approval of dapagliflozin for the treatment of type 2 diabetes as an adjunct to diet and exercise, in combination with other glucose-lowering medicinal products, including insulin, and as a monotherapy for metformin-intolerant patients. Clinical research also remains to be carried out on the long-term effects of glucosuria and other potential effects of SGLT2 inhibitors, especially in view of the observed increase in the incidence of bladder and breast cancer. SGLT2 inhibitors represent a promising approach for the treatment of diabetes, and could potentially be an addition to existing therapies.
Comparative Analysis of Guided Modal Properties of Double-Positive and Double-Negative Metamaterial Slab Waveguides
K. Y. Kim
Radioengineering , 2009,
Abstract: The guided modal properties of double-positive and double-negative metamaterial slab waveguides are numerically analyzed and compared when varying the dielectric and magnetic constants. As the cutoff frequencies of both slab waveguides remained unchanged when the absolute value of the refractive index was kept invariant, this enabled an effective comparison of the respective guided modes. Thus, the guided mode dispersion characteristics of the double-positive and double-negative slab waveguides were analyzed and compared, including several higher order modes. As a result, this comparative analysis provides greater physical insights and a better understanding of the guided modal characteristics of double-negative metamaterial slab waveguides.
Clinical potential of sodium-glucose cotransporter 2 inhibitors in the management of type 2 diabetes
Kim Y,Babu AR
Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy , 2012,
Abstract: Yoojin Kim, Ambika R BabuDivision of Endocrinology, John Stroger Jr Hospital of Cook County and Rush University, Chicago, IL, USABackground: The kidney plays an important role in glucose metabolism, and has been considered a target for therapeutic intervention. The sodium-glucose cotransporter type 2 (SGLT2) mediates most of the glucose reabsorption from the proximal renal tubule. Inhibition of SGLT2 leads to glucosuria and provides a unique mechanism to lower elevated blood glucose levels in diabetes. The purpose of this review is to explore the physiology of SGLT2 and discuss several SGLT2 inhibitors which have clinical data in patients with type 2 diabetes.Methods: We performed a PubMed search using the terms "SGLT2" and "SGLT2 inhibitor" through April 10, 2012. Published articles, press releases, and abstracts presented at national and international meetings were considered.Results: SGLT2 inhibitors correct a novel pathophysiological defect, have an insulin-independent action, are efficacious with glycosylated hemoglobin reduction ranging from 0.5% to 1.5%, promote weight loss, have a low incidence of hypoglycemia, complement the action of other antidiabetic agents, and can be used at any stage of diabetes. They are generally well tolerated. However, due to side effects, such as repeated urinary tract and genital infections, increased hematocrit, and decreased blood pressure, appropriate patient selection for drug initiation and close monitoring after initiation will be important. Results of ongoing clinical studies of the effect of SGLT2 inhibitors on diabetic complications and cardiovascular safety are crucial to determine the risk-benefit ratio. A recent decision by the Committee for Medicinal Products for Human Use of the European Medicines Agency has recommended approval of dapagliflozin for the treatment of type 2 diabetes as an adjunct to diet and exercise, in combination with other glucose-lowering medicinal products, including insulin, and as a monotherapy for metformin-intolerant patients. Clinical research also remains to be carried out on the long-term effects of glucosuria and other potential effects of SGLT2 inhibitors, especially in view of the observed increase in the incidence of bladder and breast cancer. SGLT2 inhibitors represent a promising approach for the treatment of diabetes, and could potentially be an addition to existing therapies.Keywords: sodium-glucose cotransporter type 2, SGLT2, inhibitors, kidney, glucosuria, oral diabetes agent, weight loss
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