Wyniki wyszukiwania - Biblioteka Nauki

1

Farthest points and bounded 2-functionals

100%

Kim S.

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1999

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tom Vol. 32, nr 3

531-538

EN

In this paper, we give some theorems on further characterizations and existences of E-farthest points in linear 2-normed spaces in terms of bounded linear functionals.

2

Steady 3D incompressible flow analysis for the simplified train-tunnel interaction

63%

Kim S. , Soni B. K.

Computer Assisted Mechanics and Engineering Sciences

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2000

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tom Vol. 7, No. 1

23-37

EN

This paper describes the phenomena that occur when a simplified model of train interacts with the tunnel at three locations - before, entering and leaving the tunnel. The Navier-Stokes equation is solved by introducing the artificial compressibility to change the governing equation type from the elliptic to hyperbolic. The Baldwin-Lomax turbulence modeling is employed to simulate the flow field with a Reynolds number of 10^6, and the computation domain is divided into three blocks considering the train and tunnel geometries. The grid is algebraically adapted determining the maximum solution change plane and solution weighting factors. The pressure in the adapted solution is not changed much, however, the skin friction is severely varied comparing with those of the non-adapted solutions. When the train enters into the tunnel, there are large increase in the surface pressure and skin friction distribution on the train surface.

3

Relative spatio-temporal properties of odor evoked oscillations in turtle olfactory bulb

63%

Kim S. , Zochowski M.

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2004

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tom 64

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nr 2

4

Some inequalities in 2-inner product spaces

51%

Cho Y. , Dragomir S. , White A. , Kim S.

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1999

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tom Vol. 32, nr 3

485-493

EN

In this paper we extend some results on the refinement of Cauchy-Buniakowski-Schwarz's inequality and Aćzel's inequality in inner product spaces to 2-inner product spaces.

5

Estimating parameters of empirical infiltration models from the global dataset using machine learning

51%

Kim S. , Karahan G. , Sharma M. , Pachepsky Y.

International Agrophysics

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2021

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tom 35

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nr 1

6

Damming the Torrent: Adjusting BitTorrent-like Peer-to-Peer Networks to Mobile and Wireless Environments

51%

Eittenberger P. M. , Kim S. , Krieger U. R.

Advances in Electronics and Telecommunications

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2011

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tom Vol. 2, no. 3

14--22

EN

Mobile peer-to-peer (P2P) traffic is rapidly growing, but present P2P applications are not specifically designed to operate under mobile conditions. To assess the performance of the prevalent file sharing application BitTorrent in a mobile WiMAX network, we performed a measurement and analysis campaign. In this study, we use the obtained measurement traces to further investigate specific characteristics of this P2P network. In particular, we analyze the distribution of its peer population under mobile conditions and present a general classification scheme for peer populations in BitTorrent-like P2P networks. Further, we propose a simple heuristic to bound the outdegree of BitTorrent-like P2P systems when operating in mobile environments.

7

GSK-3β-mediated regulation of cadmiuminduced cell death and survival

51%

Kim S. , Cheon H. , Kim S. M. , Kim Y. Y.

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tom 23

EN

Background: Previous studies indicated that cadmium (Cd) increases PI3-kinase/Akt phosphorylation, resulting in an alteration in GSK-3β activity. However, the mechanism of Cd-induced endoplasmic reticulum (ER) stress in neuronal cells has yet to be studied in needs further elucidation. We examined the role of GSK-3β in Cd-induced neuronal cell death and the related downstream signaling pathways. Methods: SH-SY5Y human neuroblastoma cells were treated with 10 or 20 μM BAPTA-AM and 1 μM wortmannin for 30 min and then incubated with 25 μM Cd for 12 h. Apoptotic cells were visualized via DAPI and PI staining. Data were evaluated with one-way analysis of variance (ANOVA) followed by Student’s t-test. Data are expressed as the means ± SD of experiments performed at least three times. Results: Treatment of human neuronal SH-SY5Y cells with Cd induced ER, stress as evidenced by the increased expression of GRP78, which is a marker of ER stress. Cd exposure significantly increased the phosphorylation of Akt at thr308 and ser473 and that of GSK-3β at ser9 in a time-dependent manner, while the total protein levels of GSK-3β and Akt did not change. Cd-induced apoptosis was higher in GSK-3β-knockdown cells than in normal cells. Conclusions: Our data suggest that Akt/GSK-3β signaling activated by Cd is involved in neuronal cell surviva

8

Application of Image Processing to Predict Compressive Behavior of Aluminum Foam

51%

Kim S. , Chung H. J. , Rhee K.

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 2A

635--640

EN

An image processing technique was used to model the internal structure of aluminum foam in finite element analysis in order to predict the compressive behavior of the material. Finite element analysis and experimental tests were performed on aluminum foam with densities of 0.2, 0.25, and 0.3 g/cm3. It was found that although the compressive strength predicted from the finite element analysis was higher than that determined experimentally, the predicted compressive stress-strain curves exhibited a tendency similar to those determined from experiments for both densities. However, the behavior of the predicted compressive stress-strain curves was different from the experimental one as the applied strain increased. The difference between predicted and experimental stress-strain curves in a high strain range was due to contact between broken aluminum foam walls by the large deformation.

9

Heron's formula in inner product spaces

51%

White A. , Cho Y. , Kim S.

|

1998

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tom Vol. 31, nr 1

97-102

EN

In this paper, we given Heron's formula in inner product spa

10

The acquisition of plastids/phototrophy in heterotrophic dinoflagellates

51%

Park M. G. , Kim M. , Kim S.

|

2014

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tom 53

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nr 1 Spec.is. Marine Heterotrophic Protists

11

Morphology and molecular phylogeny of the soil ciliate Anteholosticha rectangula sp. nov. from King George Island, maritime Antarctica

51%

Jung J.-H. , Park K.-M. , Kim S.

Acta Protozoologica

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2016

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tom 55

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nr 2

12

Urban and natural components of Korean magpie (Pica pica sericea) territories and their effects on prey density

45%

Kim S. , Srygley R. , Lee J. , Lee S. , Choe J.

Polish Journal of Ecology

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2012

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tom Vol. 60, nr 2

407-417

EN

Urban landscapes have a negative impact on bird species diversity, yet particular species thrive in urban communities. Like many other corvids, the Korean magpie is a successful colonizer of urban environments. On the semiurban campus of Seoul National University in Korea, we investigated whether magpies adjust territory size with building area and secondarily, whether they use vegetation and artificial components of their territory as indicators of prey density. We measured territorial areas and divided these into vegetation and artificial areas, distinguishing building area as a separate feature. We sampled prey density on each territory during the nestling stage. Territory size increased with the square root of building area (SRBA). As the length of building perimeter also increases with SRBA, we conclude that territory size was proportional to building perimeter. Prey density decreased with SRBA indicating that buildings had a negative impact on prey. Breeding success was also negatively related to SRBA. We suggest that magpies adjusted territory size according to the length of building perimeter due to a decline in prey density. As prey density declined, artificial pavement area was added to include open trash bins, which increase the availability of anthropogenic refuse such as discarded food. Vegetation area declined as prey density increased, but changes in vegetation area were minor and had little impact on prey availability measured at ground level. Structural cues were not used to adjust vegetation area, and artificial structural cues were not used to adjust territorial size over direct monitoring of prey density.

13

Robust Identification Approach to Individualized Anemia Model

38%

Akabua E. , Inanc T. , Gaweda A. , Brier M. E. , Kim S. , Zurada J. M.

Journal of Applied Computer Science Methods

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2011

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tom Vol. 3 No. 2

65--75

EN

Over ninety percent of End Stage Renal Disease (ESRD) patients suffer from anemia due to insufficient endogenous production of human erythropoietin. Until the advent of Recombinant Human Erythropoietin (r-HuEPO) over 30 years ago, patients with ESRD were treated mainly with multiple blood transfusions. The high cost of r-HuEPO in addition to the narrow margin between an effective do-sage and toxicity in drug administration calls for optimal dosage strategy capable of minimizing cost and toxicity while at the same time achieving the desired do-sage outcome. It is well known from control theory that a controller can be de-signed for any plant provided there is readily available a valid model for such a plant. We present Robust Identification procedure, a dimensionality reduction technique capable of capturing the inherent dynamics of anemia patients; conse-quently producing individualized model suitable for robust control synthesis and any other controller design methodologies.

14

Prohibitins and Ras2 protein cooperate in the maintenance of mitochondrial function during yeast aging

38%

Kirchman P. A. , Miceli M. V. , West R. L. , Jiang J. C. , Kim S. , Jazwinski S. M.

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nr 4

EN

The yeast Saccharomyces cerevisiae has a finite replicative life span. Yeasts possess two prohibitins, Phb1p and Phb2p, in similarity to mammalian cells. These proteins are located in the inner mitochondrial membrane, where they are involved in the processing of newly-synthesized membrane proteins. We demonstrate that the elimination of one or both of the prohibitin genes in yeast markedly diminished the replicative life span of cells that lack fully-functional mitochondria, while having no effect on cells with functioning mitochondria. This deleterious effect was suppressed by the deletion of the RAS2 gene. The expression of PHB1 and PHB2 declined gradually up to 5-fold during the life span. Cells in which PHB1 was deleted in conjunction with the absence of a mitochondrial genome displayed remarkable changes in mitochondrial morphology, distribution, and inheritance. This loss of mi- tochondrial integrity was not seen in cells devoid of PHB1 but possessing an intact mitochondrial genome. In a subset of the cells, the changes in mitochondrial integrity were associated with increased production of reactive oxygen species, which co-localized with the altered mitochondria. The mitochondrial deficits described above were all suppressed by deletion of RAS2. Our data, together with published information, are interpreted to provide a unified view of the role of the prohibitins in yeast aging. This model posits that the key initiating event is a decline in mitochondrial function, which leads to progressive oxidative damage that is exacerbated in the absence of the prohibitins. This aggravation of the initial damage is ameliorated by the suppression of the production of mitochondrial proteins in the absence of Ras2p signaling of mitochondrial biogenesis.

15

Structural genomics of the human protein kinase family

17%

Aparicio A. , Brooun A. , Chien E. , Chi E. , Collins B. , Cronin C. N. , Davies A. , Dougan D. , Heien E. , Hilgers M. , Hosfield D. , Hu M. , Kassel D. , Kim S. , Knuth M. W. , Kraus M. , Levin I. , Lim K. , Manuel M. , Mcree D. E. , Mol C. D. , Nowakowski J. , Rogers J. , Roth B. , Sang B. C. , Scheibe D. , Skene R. , Sridhar V. , Swanson R. V. , Thompson D. A. , Witmer D. , Wynands R. , Snell G. , Wilson K. P. , Textor G. , Vaughn D. , Ye S. , Zoa H.

Cellular and Molecular Biology Letters

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2003

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tom 08

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nr 2A