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41.
Autonomous Agents and Multi-Agent Systems - 相似文献
42.
Probabilistic classification under the Gaussian mixture model is normally based on posterior probability (p.p.) estimates of class membership. The question, how accurate they are for a given pixel, is traditionally left without attention, which may lead to unreasonable optimism about the classification results obtained. Addressing the issue, Koltunov and Ben‐Dor have proposed an unsupervised, lower confidence bound (l.c.b.)‐based method for thematic interpretation of remote sensing data. This method predicts the sampling properties of the p.p. estimators of a given pixel, to assess reliability of the estimates. The present paper describes a modified version of the method. In particular, instead of defining the l.c. bounds in terms of two first moments of the sampling distribution, as has been suggested previously, we use percentiles. Combining this with a probabilistic model of supervised identification of the mixture components yields the post‐classification uncertainty value for a given pixel and the confidence level, at which this value is proven to be maximal. In the application to an arid landscape in the Southern Negev desert, Israel, the compressed raw hyperspectral data acquired by the Digital Airborne Imaging Spectrometer (DIAS‐7915) was clustered once, whereas two thematic tasks were solved corresponding to different map legends, identification procedures, and the associated requirements to the level of detail and reliability of the thematic maps. The reference data collected in the field have provided evidence for accurate algorithmically estimated confidence bounds of the classification quality. The classification has revealed new information about the geomorphological subunits forming the study area. 相似文献
43.
R. B. Dinwiddie A. J. Whittaker D. G. Onn 《International Journal of Thermophysics》1989,10(5):1075-1084
The thermal transport properties of four commercially available AlN substrates have been investigated using a combination of steady-state and transient techniques. Measurements of thermal conductivity using a guarded longitudinal heat flow apparatus are in good agreement with published room temperature data (in the range 130–170 W · m–1 · K–1). Laser flash diffusivity measurements combined with heat capacity data yielded anomalously low results. This was determined to be an experimental effect for which a method of correction is presented. Low-temperature measurements of thermal conductivity and heat capacity are used to probe the mechanisms that limit the thermal conductivity in AlN.Paper presented at the Tenth Symposium on Thermophysical Properties, June 20–23, 1988, Gaithersburg, Maryland, U.S.A. 相似文献
44.
Wayne D. Johnson James R. Broomall David G. Onn 《Journal of Low Temperature Physics》1979,35(5-6):535-545
As a probe of the electron-neon fluid surface barrier, hot electrons (~1 eV) obtained from thin-film cold-cathode emitters were injected into neon liquid and dense neon gas at temperatures below 77 K. In neon, at all densities including the liquid, we find a universal characteristic shape for the current attenuationi/i
0 vs. E/N, in contrast to the cases of helium and hydrogen. The neon results are discussed in terms of various injection models and interpreted to imply a very long electron thermalization distance and an upper limit for the electron-neon surface barrier of 0.1 eV.Research supported through National Science Foundation Grant No. GH-37278. 相似文献
45.
Kai Bin Liew Gabriel Onn Kit Loh Yvonne Tze Fung Tan 《Drug development and industrial pharmacy》2014,40(9):1156-1162
Context: Although the general pharmacokinetics of cephalexin is quite established up-to-date, however, no population-based study on Cephalexin pharmacokinetics profile in Malay population has been reported yet in the literature.Objective: The objective of this study was to investigate the pharmacokinetics and to compare the bioavailability of three cephalexin products, Ospexin® versus MPI Cephalexin® tablet and MPI Cephalexin® capsule, in healthy Malay ethnic male volunteers in Malaysia.Material and method: A single dose, randomized, fasting, three-period, three-treatment, three-sequence crossover, open label bioequivalence study was conducted in 24 healthy Malay adult male volunteers, with 1 week washout period. The drug concentration in the sample was analyzed using high performance liquid chromatography.Result: The mean (SD) pharmacokinetic parameter results of Ospexin® were Cmax, 17.39 (4.15) μg/mL; AUC0–6, 28.90 (5.70) µg/mL?*?h; AUC0–∞, 30.07 (5.94) µg/mL?*?h; while, those of MPI Cephalexin® tablet were Cmax, 18.29 (3.01) μg/mL; AUC0–6, 30.02 (4.80) µg/mL?*?h; AUC00–∞, 31.33 (5.18) µg/mL?*?h and MPI Cephalexin® capsule were Cmax, 18.25 (3.92) μg/mL; AUC0–6, 30.04 (5.13) µg/mL?*?h; AUC0–∞, 31.22 (5.29) µg/mL?*?h.Conclusion: The 90% confidence intervals for the logarithmic transformed Cmax, AUC0–6 and AUC0–∞, of Ospexin® versus MPI Cephalexin® tablet and Ospexin® versus MPI Cephalexin® capsule were between 0.80 and 1.25. Both Cmax and AUC met the predetermined criteria for assuming bioequivalence. The pharmacokinetic profile of cephalexin in Malay population does not vary much from other world population. 相似文献
46.
Tengku Nur Zulaikha Tengku Malim Busu Norasikin Saman Safia Syazana Mohtar Ahmad Mujahid Md Noor Onn Hassan Noorhalieza Ali 《Petroleum Science and Technology》2019,37(14):1675-1682
Lignocellulosic solutions from oil palm empty fruit bunch (OPEFB) organosolv pulping process are used as demulsifiers for demulsification of crude oil emulsion using a model of water-in-oil emulsion of crude oil and brine solution. The results indicate that the demulsification performance was favored when only lignin compound was contained in the demulsifier. The phase separation capacity and rate were strongly affected by brine pH values, temperatures and demulsifier dosages. Complete phase separation capacity was achieved at the optimum conditions. The separated oil and water are qualified for refining process and water treatment, respectively, making it promising as a demulsifier. 相似文献