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1
Content available remote Moisture Responded Transformable Property Of Intelligent Coolness Knitted Fabrics For Sportswear Clothings
Ah Kim H., Kim S.
Autex Research Journal
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2017
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Vol. 17, no. 3
250--258
EN
The present study examined the physical properties related to the intelligent coolness characteristics including the wearing comfort of Huvis elastic fiber (HEF) knitted fabrics. For this purpose, three kinds of covered filament yarn specimens, such as PET-HEF, Aerocool-HEF, and PET-spandex, were prepared, and their knitted fabric specimens were made using these covered yarn specimens. These knitted fabric specimens were dyed at different dyeing temperatures and times to analyze the dyeing characteristics. The moisture absorption rate, drying, and hygral expansion of the three kinds of knitted fabric specimens were measured and compared with the yarn characteristics to determine the wearing comfort of HEF knitted fabrics.
2
Content available Application of Image Processing to Predict Compressive Behavior of Aluminum Foam
Kim S., Chung H. J., Rhee K.
Archives of Metallurgy and Materials
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2016
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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.
3
Content available Reaction Moment at the L5/S1 Joint During Simulated Forward Slipping With a Handheld Load
Liu J., Lockhart T., Kim S.
International Journal of Occupational Safety and Ergonomics
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2014
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Vol. 20, No. 3
429--436
EN
The purpose of the study was to investigate the effects of load on the net moment response at the L5/S1 joint during simulated slip events. Six young individuals were instructed to take one step with a handheld load. Sudden floor movement was randomly introduced to simulate unexpected slips. Different loads conditions (0%, 10%, 20%, 30% of body weight) were introduced at random. Three-dimensional net moments at the L5/S1 joint were computed via downward inverse dynamic model. Peak joint moment generated at 30% load level was found to be significantly higher compared to no-load condition. No peak moment differences were found among no-load, 10% or 20% load levels. Additionally, the findings from this study indicated a flexiondominant net L5/S1 joint moment pattern during motion phase associated with slip-induced falls.
4
Content available Generator split-phase protection
Kim S., Finney D., Fischer N., Kasztenny B.
Present Problems of Power System Control
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2012
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Nr 2
5-40
EN
The stator winding of a hydrogenerator is often made up of coils with multiple turns in the same slot. It is therefore possible for faults to develop between adjacent turns on the same phase (turn-toturn faults). These faults cannot be detected by the stator differential protection because there is no difference between the neutral- and terminal-side currents. Split-phase protection, an overcurrent element responding to the difference between the currents in the winding parallel branches, is typically provided to detect these faults. Ideally, the split-phase element should be sensitive enough to detect a single shorted turn. Despite the fact that the current in this turn can be six to seven times the machine nominal current, the current seen by the split-phase protection can be quite small, in the order of one-twentieth of the generator full-load current. In addition, a spurious split-phase current can be measured due to current transformer (CT) errors, saturation during external faults in particular. Therefore, primary considerations in the application of split-phase protection are the method of measuring the difference in the currents between the parallel branches and the proper selection of the CT used for this purpose.
5
Content available remote Urban and natural components of Korean magpie (Pica pica sericea) territories and their effects on prey density
Kim S., Srygley R., Lee J., Lee S., Choe J.
Polish Journal of Ecology
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2012
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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.
6
Content available Robust Identification Approach to Individualized Anemia Model
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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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.
7
Content available remote Smooth bruck loops, symmetric spaces, and nonassociative vector spaces
Kim S., Lawson J.
Demonstratio Mathematica
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2011
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Vol. 44, nr 4
755-779
EN
Our purposes in this work include the following: (1) Extend and expand earlier work on symmetric spaces, particularly that done from a nonassociative algebra point of view, from the finite-dimensional setting to the Banach space setting. (2) Take a careful look at the equivalence of the categories of smooth pointed reflection quasigroups (a special class of symmetric spaces) and uniquely 2-divisible Bruck loops ( = K-loops = gyrocommutative gyrogroups). (3) Propose a loop-theoretic analog of topological vector spaces. (4) Derive algebraic consequences and equivalences of smoothness notions, particularly the notion of parallel transport. (5) Illustrate the effective interaction of the algebraic operations of reflection, Bruck addition, and coaddition in the test case of parallelograms in symmetric spaces.
8
Content available remote Damming the Torrent: Adjusting BitTorrent-like Peer-to-Peer Networks to Mobile and Wireless Environments
Eittenberger P. M., Kim S., Krieger U. R.
Advances in Electronics and Telecommunications
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2011
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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.
9
Content available remote Steady 3D incompressible flow analysis for the simplified train-tunnel interaction
Kim S, Soni B. K.
Computer Assisted Mechanics and Engineering Sciences
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2000
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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.
10
Content available remote Some inequalities in 2-inner product spaces
Cho Y., Dragomir S., White A., Kim S.
Demonstratio Mathematica
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1999
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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.
11
Content available remote Farthest points and bounded 2-functionals
Kim S.
Demonstratio Mathematica
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1999
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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.
12
Content available remote Strict 2-convexity and strict convexity
White A., Cho Y., Kim S.
Demonstratio Mathematica
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1998
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Vol. 31, nr 4
801-804
EN
In this paper, we give some new characterizations of strict convexity and strict 2-convexity in linear 2-normed spaces.
13
Content available remote Heron's formula in inner product spaces
White A., Cho Y., Kim S.
Demonstratio Mathematica
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1998
|
Vol. 31, nr 1
97-102
EN
In this paper, we given Heron's formula in inner product spa
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