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1.
Zoran ?ujovi? Radivoje Sreji? Dušan Vu?eli? Dragomir Vitorovi? Branimir Jovan?i?evi? 《Fuel》1995,74(12):1903-1909
A sample of kerogen from Aleksinac oil shale was examined by high-resolution solid-state 13C n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combination of NQS and T1C methods with a peak-synthesis technique applied to the 13C CP—MAS spectrum. Relaxation parameters from these experiments were used to estimate differences in relative ‘mobility’ of various structural units. The kerogen was found to be highly aliphatic and to contain 79% long-chain aliphatic plus alicyclic structures, as well as 9% aromatic structures. These findings are in good agreement with the characterization of the same kerogen from its oxidation products. 相似文献
2.
Region-Based Hierarchical Image Matching 总被引:1,自引:0,他引:1
This paper presents an approach to region-based hierarchical image matching, where, given two images, the goal is to identify
the largest part in image 1 and its match in image 2 having the maximum similarity measure defined in terms of geometric and
photometric properties of regions (e.g., area, boundary shape, and color), as well as region topology (e.g., recursive embedding
of regions). To this end, each image is represented by a tree of recursively embedded regions, obtained by a multiscale segmentation
algorithm. This allows us to pose image matching as the tree matching problem. To overcome imaging noise, one-to-one, many-to-one,
and many-to-many node correspondences are allowed. The trees are first augmented with new nodes generated by merging adjacent
sibling nodes, which produces directed acyclic graphs (DAGs). Then, transitive closures of the DAGs are constructed, and the
tree matching problem reformulated as finding a bijection between the two transitive closures on DAGs, while preserving the
connectivity and ancestor-descendant relationships of the original trees. The proposed approach is validated on real images
showing similar objects, captured under different types of noise, including differences in lighting conditions, scales, or
viewpoints, amidst limited occlusion and clutter. 相似文献
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4.
D. M. Todorovic M. D. Rabasovic D. D. Markushev V. Jovic K. T. Radulovic 《International Journal of Thermophysics》2017,38(3):40
Rectangular silicon cantilevers are studied by the photoacoustic (PA) elastic bending method. Experimental signals versus modulation frequency of the excitation optical beam are measured and analyzed in a frequency range from 20 Hz to 50 000 Hz. The procedure for experimental signal correction to eliminate the frequency characteristics of the measuring system is given. The corrected experimental signal shows a good correlation with theoretically calculated PA signal at frequencies below 32 000 Hz. The corrected experimental PA elastic bending signals for cantilevers with different thicknesses are analyzed. The experimental results allow identifying the resonant frequency (the first resonant mode) of the cantilever vibrations. These values are in good agreement with the theoretically computed values. A theoretical model of the optically excited Si cantilever is derived, taking into account plasmaelastic, thermoelastic, and thermodiffusion mechanisms. Dynamic relations for the amplitude and phase of electronic and thermal elastic vibrations in optically excited cantilevers are derived. The theoretical model is compared to the experimental results. 相似文献
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7.
Ana Gavrovska Vesna Bogdanović Irini Reljin Branimir Reljin 《Computer methods and programs in biomedicine》2014
Having in mind the availability of electronic stethoscopes, phonocardiograms (PCGs) have become popular for cardiovascular functionality monitoring and signal processing applications. Detection of fundamental heart sounds (HSs), S1s and S2s, is considered to be a crucial step in PCG analysis. Electrocardiogram (ECG), noted as a reference signal, is often synchronously recorded in order to simplify the S1/S2 detection process. Nevertheless, electronic stethoscopes are frequently used without additional ECG equipment. We propose a new algorithm for automatic fundamental HSs detection via: joint time-frequency representation based on pseudo affine Wigner–Ville distribution (PAWVD), Haar wavelet lifting scheme (Haar-LS), normalized average Shannon energy (NASE) and autocorrelation. The performance of the proposed algorithm was calculated on both normal (50) and pathological (75) PCG recordings, eight seconds long each, contributed by 125 different pediatric patients. The algorithm showed relatively high recall (90.41%) and precision (96.39%) rates of S1/S2 detection procedure in a variety of PCG signals, without ECG as a reference. Furthermore, it indicated the ability to overcome splitting within the S1/S2 heart sounds. 相似文献
8.
Dragan Kandic Branimir Reljin 《International Journal of Circuit Theory and Applications》1994,22(3):163-174
A new class of non-canonic, driving-point immittance realizations of passive, common-ground, transformerless, two-element-kind RLC networks with minimum number of nodes is presented. Six new algorithms of realization are developed by application of canonic, orthogonal matrix transformations with reduced number of degrees of freedom. the number of applied RLC elements of one kind can be minimized and of the other kind reduced, while their parameter values are calculated directly in a linear way. 相似文献
9.
Vladan Todorovic 《软件世界》2007,(21):20-21
奥运会网络会运行三大系统:计时计分系统(Timing&Scoring)、信息发布系统(IDS)以及运动会管理系统(GMS)。 相似文献
10.
AdaBoost has been successfully used in many signal classification systems. However, it has been observed that on highly noisy data AdaBoost easily leads to overfitting, which seriously constrains its applicability. In this paper, we address this problem by proposing a new regularized boosting algorithm LPnorm2-AdaBoost (LPNA). This algorithm arises from a close connection between AdaBoost and linear programming. In the algorithm, skewness of the data distribution is controlled during the training to prevent outliers from spoiling decision boundaries. To this end, a smooth convex penalty function (l 2 norm) is introduced in the objective function of a minimax problem. A stabilized column generation technique is used to transform the optimization problem into a simple linear programming problem. The effectiveness of the proposed algorithm is demonstrated through experiments on many diverse datasets. 相似文献