7,831 research outputs found
Prediction of long-term pore pressure dissipation behavior by short-term piezocone dissipation test
No full textThe coefficient of consolidation determined from piezocone dissipation test and common interpretation methods makes the predicted dissipation curve match only at 50% degree of dissipation of the measured dissipation curve. It makes it difficult to predict the long-term pore pressure dissipation behavior of in-situ soft deposits. Therefore, based on the authors' previous result [Kim YS, Lee SR, Kim YT. Application of an optimization design technique for determining the coefficient of consolidation by using piezocone test data. Computers and Geotechnics 1997;21(4): 77-93] in which an optimized coefficient of consolidation reflects well the measured dissipation trend over the input degree of dissipation range, a systematic way of predicting a more realistic pore pressure dissipation behavior at high degree of dissipation with the optimized coefficient of consolidation is proposed. It was found that, relatively over the wide range of dissipation, the optimized coefficient of consolidation is more consistent than those determined by other researchers' methods. Applied to some real examples, it is also shown that the dissipation behavior of pore water pressure at a high degree of the dissipation range can be predicted well if the coefficient of consolidation is determined using the optimization technique with the data up to around 50% dissipation. Thus, it is expected that the proposed method saves time and expenses in conducting dissipation tests in the held. (C) 2000 Published by Elsevier Science Ltd. All rights reserved
Actin filaments of guard cells are reorganized in response to light and abscisic acid
No full textWe recently showed that treatment with actin antagonists perturbed stomatal behavior in Commelina communis L. leaf epidermis and therefore suggested that dynamic changes in actin are necessary for signal responses in guard cells (M. Kim, P.K. Hepler, S.O. fun, K.-S. Ha, Y. Lee [1995] Plant Physiol 109: 1077-1084). Here we show that actin filaments of guard cells, visualized by immunofluorescence microscopy, change their distribution in response to physiological stimuli. When stomata were open under white-light illumination, actin filaments were localized in the cortex of guard cells, arranged in a pattern that radiates from the stomatal pore. In marked contrast, for guard cells of stomata closed by darkness or by abscisic acid, the actin organization was characterized by short fragments randomly oriented and diffusely labeled along the pore site. Upon abscisic acid treatment, the radial pattern of actin arrays in the illuminated guard cells began to disintegrate within a few minutes and was completely disintegrated in the majority of labeled guard cells by 60 min. Unlike actin filaments, microtubules of guard cells retained an unaltered organization under all conditions tested. These results further support the involvement of actin filaments in signal transduction pathways of guard cells.X1185sciescopu
Design of a universal middleware bridge for device interoperability in heterogeneous home network middleware
No full textThis paper proposes the design of the software Universal Middleware Bridge (UMB) that can be used to solve seamless interoperability problems caused by the heterogeneity of several kinds of home network middleware. We verified that the proposed UMB dynamically maps physical devise in all different middleware domains into virtually abstracted devices in the UMB domain and enables all home devices overlaid on heterogeneous networks to be seen as virtually the same physical devices in the same middleware domain, as well as to detect and control each other. As a result, it is concluded that the proposed architecture provides commercial feasibility and cost benefic for the system implementations(1).The authors wish to thank Professors Young-Hee Lee for his
contributions to design of UMB
Modelling and vibration analysis of misaligned rotor-ball bearing systems
No full textA dynamic model is derived for misaligned rotor-ball bearing systems driven through a flexible coupling by treating the reaction loads and deformations at the bearing and coupling elements as the misalignment effect. In order to verify the validity of the misaligned rotor system model, experiments are extensively carried out with a laboratory test rig. Both the experimental and simulation results agree well in that, as the angular misalignment increases, the whirling orbits tend to collapse toward a straight line and the natural frequency of the misaligned rotor system associated with the misalignment direction increases largely. It is found that the increase in natural frequency is mostly due to the increase in effective bearing moment stiffness associated with the misalignment direction. (C) 1999 Academic Press
Supplement_file - The usefulness of the SOFA and APACHE II scoring systems for the early prediction of mortality in patients with dapsone poisoning
No full textSupplement_file for The usefulness of the SOFA and APACHE II scoring systems for the early prediction of mortality in patients with dapsone poisoning by Y Lee, SJ Kim, YS Kim, H Kim, DK Lee, J Lee, TH Go, and YS Cha in Human & Experimental Toxicology</p
Supplement_figure - The usefulness of the SOFA and APACHE II scoring systems for the early prediction of mortality in patients with dapsone poisoning
No full textSupplement_figure for The usefulness of the SOFA and APACHE II scoring systems for the early prediction of mortality in patients with dapsone poisoning by Y Lee, SJ Kim, YS Kim, H Kim, DK Lee, J Lee, TH Go, and YS Cha in Human & Experimental Toxicology</p
Effect of matrix hardness on the creep properties of a 12CrMoVNb steel
No full textUsing a creep-ductile 12CrMoVNb steel, constant-load creep tests were conducted in air at 650 degrees C, and the effects of matrix hardness on the creep properties were investigated. Specimens with a matrix hardness (Rc) of 30, 25, and 20 were prepared using different tempering conditions. The creep behaviors were well described by the power-law creep equation, with the stress exponents of strain rate (n) and rupture time (chi) decreasing with matrix hardness. Rupture-time analyses showed that creep rupture occurred by the nucleation of creep cavities on second-phase particles and growth by creep flow of the surrounding matrix. A hardness decrease tends to lower the rupture time and increase the strain rate (epsilon), and the effect of hardness was quite distinct at high applied stresses due to the short creep times, but not so at low applied stresses due to elongated creep times. After 10(4) hours, there were almost no effects. The hardness decrease during the creep test was more severe for the specimens with higher hardness and was also more severe in the gage section than in the head section, the latter due to the stress-assisted diffusion in the coarsening of carbides. Microstructural examinations showed that subgrain boundaries grew during creep, and equiaxed carbide particles coarsened during the creep test, the rates of coarsening being greater for specimens with a higher hardness
EFFECTS OF WHITE, BLUE, RED-LIGHT AND DARKNESS ON PH OF THE APOPLAST IN THE SAMANEA PULVINUS
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EFFECTS OF TEMPERATURE ON H+ UPTAKE AND RELEASE DURING CIRCADIAN RHYTHMIC MOVEMENTS OF EXCISED SAMANEA MOTOR ORGANS
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