In this paper, we experimentally realized mixed space transmission of laser beam and microwave signal which is generated by two laser beams beating using optical heterodyne method. And the hybrid RF/FSO system is conf...
ISBN:
(纸本)9781538679371;9781538679364
In this paper, we experimentally realized mixed space transmission of laser beam and microwave signal which is generated by two laser beams beating using optical heterodyne method. And the hybrid RF/FSO system is confirmed to be stable and of prior performance.
In this paper, a communication system based on DCSK - Differential chaotic shift keying modulation, which can be used in underwater acoustic communications, is proposed. Recently, we see an increase of various communi...
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In this paper, a communication system based on DCSK - Differential chaotic shift keying modulation, which can be used in underwater acoustic communications, is proposed. Recently, we see an increase of various communication schemes using chaotic signals, which show good results in terms of signal propagation in dense environments. In this paper, three chaotic systems have been used and compared: Logistic map, Henon map and Tent *** influence of the seawater on the propagation of acoustic signals is analyzed in such a way that instead of white Gaussian noise, a real recording in .wav format, made in the North Sea, was used in the simulations. Simulations and modeling of the communication system were performed in MATLAB.
While sparsity has been exploited in many inference accelerators, not much work is done for training accelerators. Exploiting sparsity in training accelerators involves multiple issues, including where to find sparsit...
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Inventory changes can help macroeconometric models to balance the supply and the demand side and to endogenize utilization variables without resorting to an arbitrary potential output level. Both results stem from for...
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Inventory changes can help macroeconometric models to balance the supply and the demand side and to endogenize utilization variables without resorting to an arbitrary potential output level. Both results stem from formulating inventory-augmented production functions in which inventory changes act as a stationary error correction mechanism between value added and inputs on one side and value added and final sales on the other. This happens because factors or prices may adjust too slowly to productivity and sales shocks. (C) 2002 Elsevier Science B.V. All rights reserved.
Dispersion modelling can be used to provide timely information to emergency response providers in the event of an accidental release of hazardous gas. The model used is required to run quickly, have minimal data requi...
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ISBN:
(纸本)9782868150622
Dispersion modelling can be used to provide timely information to emergency response providers in the event of an accidental release of hazardous gas. The model used is required to run quickly, have minimal data requirements and, provide reliable results given appropriate input data. The ALOHA software package has been designed for such circumstances however it is not appropriate for complex topography. The emergence of 'shallow layer' models and increases to personal computer processing speeds in the last decade have allowed accidental release simulations involving complex terrain to be completed with increasing speed. This paper presents the results of two dispersion models that could be used to predict heavy gas dispersion in the event of an accidental release;ALOHA, categorised as a similarity profile model and selected for its widespread use and regular maintenance and update cycles, and TWODEE-2, categorised as a shallow layer model and selected for its ability to accommodate complex terrain effects. The models were run a number of times under increasingly sloping terrain to judge how varying terrain slopes might contribute to misleading results should terrain be ignored. Results for flat topography from the two models were found to be different, but reasonably comparable within 1km. It was found that topography is important and does affect dispersion and furthermore, relatively minor slopes were found to influence dispersion from the flat topography scenarios. For the studied scenarios model run times of TWODEE-2, when compared to ALOHA, were longer but not unlikely to be excessive for emergency response situations.
Wavelet packets as the adaptive version of Wavelets have been proved to be a powerful tool for analyzing transients with extended multiresolution[2]. In this paper, we compare the results obtained by short time Fourie...
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ISBN:
(纸本)0780347781
Wavelet packets as the adaptive version of Wavelets have been proved to be a powerful tool for analyzing transients with extended multiresolution[2]. In this paper, we compare the results obtained by short time Fourier Transform with wavelet transform for a set of vibration signal in condition monitoring of electrical equipment. Wavelet packets adapt to nature of transient signals through the best basis algorithm and provide transient representation in a small number of coefficients. In this way, wavelet packets offer an advantage over Fourier Transform for analyzing transients.
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