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More efficient ground truth ROI image coding technique： implementation and wavelet based application analysis 总被引：1，自引：0，他引：1
KUMARAYAPA Ajith ZHANG Ye 《浙江大学学报(A卷英文版)》2007,8(6):835-840
In this paper, more efficient, low-complexity and reliable region of interest (ROI) image codec for compressing smooth low texture remote sensing images is proposed. We explore the efficiency of the modified ROI codec with respect to the selected set of convenient wavelet filters, which is a novel method. Such ROI coding experiment analysis representing low bit rate lossy to high quality lossless reconstruction with timing analysis is useful for improving remote sensing ground truth sur- veillance efficiency in terms of time and quality. The subjective [i.e. fair, five observer (HVS) evaluations using enhanced 3D picture view Hyper memory display technology] and the objective results revealed that for faster ground truth ROI coding applications, the Symlet-4 adaptation performs better than Biorthogonal 4.4 and Biorthogonal 6.8. However, the discrete Meyer wavelet adaptation is the best solution for delayed ROI image reconstructions. 相似文献
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We present a broad overview of the emerging field of gravitational-wave astronomy. Although gravitational waves have not been
directly detected yet, the worldwide scientific community is engaged in an exciting search for these elusive waves. Once detected,
they will open up a new observational window to the Universe. 相似文献
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Sandanayake Thanuja Chandani Karunanayaka Shironica Priyanthi Madurapperuma Ajith Parakum 《Education and Information Technologies》2021,26(3):3135-3154
Open Educational Resources (OER) integrated online courses provide a rich and a flexible learning environment to acquire knowledge and skills among undergraduates. A significant issue with OER-integrated online courses is the poorly addressed instructional design features. Instructionally rich online courses will have a greater impact on both teaching and learning. This study is aimed at exploring different support systems in relation to the undergraduate learning process through the design of OER-integrated online courses. It explored design features under four main Instructional Design (ID) aspects, being: Information Design, Instruction Design, Interface Design and Interaction Design. The study adopted a Design-Based Research approach through analysis, design, development, implementation and evaluation of an intervention in multiple phases, using mixed methodologies. This resulted in a design framework with reusable design principles for OER-integrated online learning. The outcomes of this study will contribute to enhance OER-integrated course design and to develop undergraduate education.
相似文献4.
Chemoprevention represents a new intervention strategy to control some type of carcinogenesis especially in subjects at high
risk for cancer development. Experimental and epidemiological data indicate that a variety of nutritional factors including
vitamin C and E are effective to lower the risk of some types of cancer. However large prospective studies have failed to
find such significant association. A comparative and combined in vitro antimutagenic potential of two antioxidant vitamins
ascorbic acid (vitamin C) and α-tocopherol (vitamin E) were evaluated using Ame’s Salmonella typhimurium test assay. Directly
acting mutagens such as sodium azide (NaN3) and 4-Nitro-o-phenylenediamine (NPDA), and N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) were used to induce mutation in salmonella strains
TA 98 and TA 100. Vitamin C significantly (P < 0.01) and dose dependently inhibited the mutagenicity induced by all the three mutagens. The percent inhibitions of vitamin
C at 15 mg/plate were 33.8% (NaN3), 52.5 % (MNNG) and 55.4 % (NPDA). Vitamin E (15 mg/plate) was effective to inhibit mutagenicity induced by NaN3 and MNNG
but did not inhibit mutation induced by NPDA. Combination of vitamins (vitamin C plus vitamin E) produced only an additive
antimutagenic activity when compared to their activity at 5 mg/plate. The results of the study concluded that vitamin C is
a better antimutagenic agent than vitamin E and combination of vitamins did not produce any synergistic activity. 相似文献
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T. A. Ajith 《Indian journal of clinical biochemistry : IJCB》2010,25(1):67-73
Iron is an essential nutrient for a number of cellular activities. However, excess cellular iron can be toxic by producing
reactive oxygen species (ROS) such as superoxide anion (O2−) and hydroxyl radical (HO·) that damage proteins, lipids and DNA. Mutagenic and genotoxic end products of lipid peroxidation can induce the decline
of mitochondrial respiration and are associated with various human ailments including aging, neurodegenerative disorders,
cancer etc. Zingiber officinale Roscoe (ginger) is a widely used spice around the world. The protective effect of aqueous
ethanol extract of Z. officinale against ROS-induced in vitro lipid peroxidation and DNA damage was evaluated in this study.
The lipid peroxidation was induced by hydroxyl radical generated from Fenton’s reaction in rat liver and brain homogenates
and mitochondrial fraction (isolated from rat liver). The DNA protection was evaluated using H2O2-induced changes in pBR-322 plasmid and Fenton reaction-induced DNA fragmentation in rat liver. The results indicated that
Z. officinale significantly (P<0.001) protected the lipid peroxidation in all the tissue homogenate/mitochondria. The extract
at 2 and 0.5 mg/ml could protect 92 % of the lipid peroxidation in brain homogenate and liver mitochondria respectively. The
percent inhibition of lipid peroxidation at 1mg/ml of Z. officinale in the liver homogenate was 94 %. However, the extract
could partially alleviate the DNA damage. The protective mechanism can be correlated to the radical scavenging property of
Z. officinale. The results of the study suggest the possible nutraceutical role of Z. officinale against the oxidative stress
induced human ailments. 相似文献
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Comparing the fit of alternative models has become a standard procedure for analyzing covariance structure analysis. Comparison of alternative models is typically accomplished by examining the fit of each model to sample data. It is argued that rather than using this indirect approach, one should do direct comparisons of the similarities and differences among competing models. It is shown that among the existing good‐ness‐of‐fit indexes, the root mean square residual (RMSR) is the only one that can be used for this purpose. However, the RMSR fails to satisfy some important statistical desiderata. Rao's Distance (RD), an alternate measure, is shown to overcome this limitation of RMSR. The preference for RD over RMSR for model comparisons is illustrated through a detailed analysis of a particular sample of multitrait‐multimethod data. A simulation study conducted to empirically investigate the sampling behavior of RD reveals that the true orderings of intermodel proximities are recovered (on average) with a fair degree of accuracy. 相似文献
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