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Cognitive radio (CR) was proposed in wireless communications to improve spectral efficiency based on the concept of opportunistic spectrum access. Because orthogonal frequency division multiplexing (OFDM) has become the major access technique, an efficient spectrum sensing technique targeted at OFDM-based signals is one of the primary requirements of CR networks. To reduce computational complexity,...
The solubility of limonin in the binary solvent mixtures (methanol+water) and (acetone+water) with various initial mole fractions of methanol or acetone was measured by high-performance liquid chromatography (HPLC) at different temperatures ranging from 283.2K to 318.2K. The solubility of limonin increased with increasing initial mole fraction of methanol in (methanol+water) mixtures, whereas it had...
The relationship of spectral feature, spectral vegetation indices, and biophysical, and biochemical parameters between susceptible and resistant varieties of tomatoes under tomato yellow leaf curl virus (TYLCV) stress were analyzed, and the significance of vegetation indices were tested in this paper. The results showed significant different existed in leaves of ten varieties tomato Leaves.Under the...
Synthetic aperture radar automatic target recognition (SAR ATR) remains a challenging problem in military and civil field. Much work has been done to improve the performance of SAR ATR systems, both in feature extraction and classifier designing. This paper designs a multiple classifier system to solve the target classification problem in the area of SAR ATR. The proposed multiple classifier system...
The purpose of this paper was to find some feature pattern which may be used in diagnosis of blood stasis syndrome (BSS, a unique concept of traditional Chinese medicine) with myocardial ischemia. After establishing an animal model of Chinese experimental miniature swine, 7 indicators in plasma, e.g. troponin T (cTNT), heat shock protein 27 (HSP27), cytochrome C (Cyt C), endothelin-1 (ET-1), calcitonin...
Recent years, nonstandard employment has been coming an important method for organization to increase its flexible ability. Especial the nonstandard employing knowledge workers (NSE KWs) have been the vital part of organization's core competition. NSE KWs have different natures and working context comparing with standard employing knowledge workers (SE KWs), so there are different factors to influence...
Due to the self rotation and revolution of the earth and the satellite moving comparatively, the delay rate changes intricately and that affects correlation result when we use VLBI to detect Satellite. To solve the problem, a new method of delay-delay rate 2-D correlation is proposed which based on time-frequency 2-D correlation. This method applies ambiguity function calculation of time-frequency...
Statistic analyses were made based on the daily air pollution index data at five cities in Xinjiang of northwest of China from January 2005 to October 2008. Trajectory model (HYSPLIT4.8) was used to analysis the backward and forward trajectories on heavy air pollution days during winter of 2006. The results presented as following. 1) Winter is the season with the highest occurrence frequency of air...
In this paper, a method is presented for connectively analyzing the dynamic factors in physical training by utilizing computers. Through analyzing the training results of a certain triple jumper, the thesis expounds how to build the mathematics models for the connective factors in system and it also presents the detailed procedure by utilizing these models to connectively analyze the dynamic changes...
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