Relevant bibliographies by topics / Transformation du signal

Academic literature on the topic 'Transformation du signal'

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Published: 22 June 2024

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Journal articles on the topic "Transformation du signal":

Saidov, B. B., and V. F. Telezhkin. "Optimum ECG Signal Filtering Based on Wavelet Transformation." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 21, no. 4 (November 2021): 167–72. http://dx.doi.org/10.14529/ctcr210415.

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The development of digital signal processing and microprocessor technology creates conditions for improving methods for diagnosing the functional state of organs. Wavelet analysis is a modern and promising method of information processing. In order to determine the effective optimal filtering of the electrocardiography signal based on the wavelet transform, wavelet filtering was performed using wavelets of different families, the efficiency of using different levels of decomposition, me¬thods for calculating the threshold and types of the threshold function was investigated. Aim. Determination of effective optimal filtering of electrocardiography signal based on wavelet transform. Materials and methods. Cardiograms were taken for analysis. Then they were digitized and entered into a computer for processing. A program was written in the Matlab environment that implements continuous and discrete wavelet transform. Results. As a result of the research, 56 combinations of noise reduction parameters were tested for three noise levels. It was found that the maximum degree of signal purification from noise was obtained using the Coiflets 5 wavelet using a rigid thresholding method, with a heuristic method for calculating the threshold value. Wavelet Simlet 8 has lower correlation coefficient values than Coiflets 5, at 35 dB the best result is 97%, the noise level is 40 dB the best result is 98.7%, the noise level is 45 dB the best result is 99.3%, which is generally negligible differs from the correlation coefficients of the wavelet Coiflets 5. Conclusion. As a result of the study, the first and the present work, the following conclusions were made: the optimal level of the wavelet decomposition of the ECG signal N = 2; the maximum degree of signal cleaning from noise was obtained using the Coiflets 5 wavelet using a rigid thresholding method, with a heuristic method for calculating the threshold value; Simlet 8 wavelet using a soft thresholding method with a minimax thresholding method also shows noteworthy results, slightly inferior to Coiflets 5 wavelet results.

Shah, Yogendra Prasad. "Applications of Fourier Series and Fourier Transformation." Cognition 2, no. 1 (October 30, 2019): 145–56. http://dx.doi.org/10.3126/cognition.v2i1.55605.

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This paper investigates into the application of fourier transformation and series, which converts time domain signal to frequency domain signals, at which signals can be analyzed. Unlike Laplace transform, Fourier Transforms does not have full S plane, it just have the frequency j2πf plane. Fourier Transforms helps to analyze spectrum of the signals, helps in find the response of the LTI systems. (Continuous Time Fourier Transforms is for Analog signals and Discrete time Fourier Transforms is for discrete signals). Discrete Fourier Transforms are helpful in Digital signal processing for making convolution and many other signal manipulations. Overall, the paper will conclude the impact of Fourier Transforms in life.

Gong, Tao, Jianhua Yang, Miguel A. F. Sanjuán, Houguang Liu, and Zhen Shan. "Vibrational resonance by using a real-time scale transformation method." Physica Scripta 97, no. 4 (March 17, 2022): 045207. http://dx.doi.org/10.1088/1402-4896/ac5bc5.

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Abstract Vibrational resonance (VR) shows great advantages in signal enhancement. Nonlinear frequency modulated (NLFM) signals widely exist in various fields, so it is of great significance to enhance a NLFM signal. However, for the complex NLFM signal, where its instantaneous frequency of the signal varies nonlinearly, the traditional VR method is no longer applicable. To solve this problem, a rescaled VR method by a real-time scale transformation method is proposed. Its basic principle is to use the real-time scale coefficient and auxiliary signal parameters to match a NLFM signal in a nonlinear system. The corresponding numerical simulation is carried out to process three kinds of typical NLFM signals. The results manifest the excellent performance of the proposed method for the signal enhancement of NLFM signals. The method can process NLFM signals with an arbitrary frequency variation. Consequently, it has certain theoretical and practical values in some fields.

Gogolewski, Damian, Paweł Zmarzły, Tomasz Kozior, and Thomas G. Mathia. "Possibilities of a Hybrid Method for a Time-Scale-Frequency Analysis in the Aspect of Identifying Surface Topography Irregularities." Materials 16, no. 3 (January 31, 2023): 1228. http://dx.doi.org/10.3390/ma16031228.

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The article presents research results related to assessing the possibilities of applying modern filtration methods to diagnosing measurement signals. The Fourier transformation does not always provide full information about the signal. It is, therefore, appropriate to complement the methodology with a modern multiscale method: the wavelet transformation. A hybrid combination of two algorithms results in revealing additional signal components, which are invisible in the spectrum in the case of using only the harmonic analysis. The tests performed using both simulated signals and the measured roundness profiles of rollers in rolling bearings proved the advantages of using a complex approach. A combination of the Fourier and wavelet transformations resulted in the possibility to identify the components of the signal, which directly translates into better diagnostics. The tests fill a research gap in terms of complex diagnostics and assessment of profiles, which is very important from the standpoint of the precision industry.

Liu, Yunjiang, Fuzhong Wang, Lu Liu, and Yamin Zhu. "Secondary signal-induced large-parameter stochastic resonance for feature extraction of mechanical faults." International Journal of Modern Physics B 33, no. 15 (June 20, 2019): 1950157. http://dx.doi.org/10.1142/s0217979219501571.

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Aiming to solve the problem that it is difficult to extract large parameter signals from a strong noise background, a novel method of large parameter stochastic resonance (SR) induced by a secondary signal is proposed. The SR mechanism of high-frequency signals is expounded by analyzing the density distribution curve. High-frequency signals are converted to low-frequency signals using the scale transformation method, and then large-parameter SR is induced by the secondary signal. Ultimately, the method is applied to the feature extraction of mechanical faults. Simulation and experimental results indicate that (i) the effect of SR induced by the secondary signal is significantly enhanced when the frequency of the secondary signal is twice that of the signals to be detected after the scale transformation; (ii) when the frequency of secondary signal is twice the maximum frequency of the signals to be detected after the scale transformation, choosing an appropriate amplitude of secondary signal can alleviate the problem that the noise energy is excessively concentrated in the low-frequency channel with regard to the extraction of two-frequency or three-frequency high-frequency signals; and (iii) by adding the secondary signal to the engineering example, the fault power spectrum value of system output is 101% higher than that without the secondary signal.

Zhao Li, Feng Ji, Zhai Guang-Jie, and Zhang Li-Hua. "Wavelet transformation for magnetocardiography signal." Acta Physica Sinica 54, no. 4 (2005): 1943. http://dx.doi.org/10.7498/aps.54.1943.

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Zehner, William J., and R. Lee Thompson. "Signal transformation for aural classification." Journal of the Acoustical Society of America 112, no. 6 (2002): 2520. http://dx.doi.org/10.1121/1.1536506.

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Liu, Xiangying, and Elijah Kannatey-Asibu. "Acoustic Emission During Athermal Martensitic Transformation in Steels." Journal of Engineering for Industry 112, no. 1 (February 1, 1990): 84–91. http://dx.doi.org/10.1115/1.2899299.

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A relationship developed earlier between acoustic emission signals and the process of athermal martensitic transformation based on the free energy associated with the process is extended and verified experimentally. The relationship is found to model the process characteristics very well. The intensity of AE signal generated during transformation was found to be proportional to the temperature derivative of the fraction of martensite, the cooling rate, and volume of specimen. The AE signal was also found to be related to the carbon content of the steel. During transformation, the signal intensity was found to increase to a peak, and then tail off near the end of the transformation. Values of the martensite start temperature obtained from plots of the total RMS squared AE signals were also found to correlate well with values from the literature.

Ryapolov, A. V., V. E. Mitrokhin, N. V. Fambulov, and D. A. Gredyaev. "DIGITAL SIMULATOR OF GPS C/A SIGNALS." RADIO COMMUNICATION TECHNOLOGY, no. 48 (June 16, 2021): 64–78. http://dx.doi.org/10.33286/2075-8693-2021-48-64-78.

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A structure of a digital signal simulator which allows generating testing GPS C/A signals or creating signal-like interference is observed. Proposed scheme of the simulator includes generators of navigation signals, a generator of noiselike signal, a signal summation block and a block of signal bit capacity transformation. A vari-ant of simulator hardware implementation in FPGA is showed. Examples of gener-ated signals are presented.

Guo, Ye Cai, and Zheng Xin Liu. "Fuzzy Neural Network Blind Equalization Algorithm Based on Signal Transformation." Applied Mechanics and Materials 44-47 (December 2010): 4146–50. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.4146.

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To recover QAM signals at the receiver of blind equalizer, a Fuzzy C-means clustering Neural Network Blind Equalization Algorithm based on Signal Transformation (ST-FNN-BEA) is proposed. The proposed algorithm uses signal transformation method to debase the computational complexity of equalizer input signals and speed up the convergence rate, and makes use of fuzzy c-means clustering algorithm dividing the equalizer input signals into each cluster center with different membership values to improve the equalization performance. The proposed ST-FNN-BEA outperforms Neural Network Blind Equalization Algorithm (NN-BEA) and Neural Network Blind Equalization Algorithm based on Signal Transformation (ST-NN-BEA) in improving convergence rates and reducing mean square error. The performance of ST-FNN-BEA is proved by the computer simulation with underwater acoustic channels.

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Dissertations / Theses on the topic "Transformation du signal":

Lemire, Isabelle. "Transformation du signal d'ancrage de l'endopeptidase neutre-24.11 en un peptide signal." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21484.pdf.

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Cexus, Jean-Christophe. "Analyse des signaux non-stationnaires par transformation de Huang, opérateur de Teager-Kaiser et transformation de Huang-Teager (THT)." Rennes 1, 2005. http://www.theses.fr/2005REN1S124.

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L'objectif de cette thèse est le traitement et l'analyse des signaux non-stationnaires, multi-composantes. Nous proposons de nouveaux outils de filtrage et de débruitage basés sur la Transformation de Huang (ou Décomposition modale empirique : EMD). Un nouvel opérateur d'énergie pour l'analyse temporelle (démodulation, détection, interaction, similarité,. . . ) des signaux est introduit. Cet opérateur généralise celui de Teager-Kaiser (TK). Nous établissons les liens théoriques entre cet opérateur et les représentations temps-fréquence de la classe de Cohen. Pour l'analyse temps-fréquence, nous introduisons une nouvelle méthode basée sur l'utilisation conjointe de l'EMD et de l'opérateur de TK : la Transformation de Huang-Teager (THT). Pour illustrer ces concepts, des résultats de filtrage, de débruitage, de détection, d'analyse temps-fréquence de signaux sont présentés. Nous terminons par l'analyse et classification des échos de cibles sonars par THT.

Fachrudin, Imam. "Traitement du signal ECG - approche par la transformation en ondelettes." Rouen, 1995. http://www.theses.fr/1995ROUES040.

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Les travaux présentés dans ce mémoire ont pour objectif d'évaluer l'efficacité de la transformation en ondelettes (TO) dans les opérations de traitement du signal ECG : l'analyse, la détection, le filtrage et la compression. L'analyse temps-fréquence par la TO permet de mettre en évidence les structures fréquentielles des composantes ECG : ses ondes, ses bruits et certains événements pathologiques. Les algorithmes de détection de complexes ECG sont élaborés à partir des propriétés du module et de la phase de la transformation. La relation de la TO avec l'analyse multirésolution et la découverte de l'algorithme rapide de la TO sont les bases du développement de la méthode de filtrage et du nouveau concept de compression de données. Les performances de chacune des méthodes sont comparables à celles des méthodes existantes, sinon meilleures

Kårehed, Karin. "Signal Transduction in Malignant Cells – Transformation, Activation and Differentiation." Doctoral thesis, Uppsala University, Department of Genetics and Pathology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6346.

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All aspects of cell life are regulated by signal transduction mechanisms. This thesis describes the regulatory roles of a few key signal transduction molecules involved in three major biological responses. The studied pathways include platelet derived growth factor (PDGF)-BB induced transformation of murine fibroblasts, interferon (IFN)-γ stimulated monocyte activation and all-trans retinoic acid (ATRA) induced myeloid differentiation.

We found that intact phosphoinositide 3OH-kinase (PI3K) activity is essential in the signaling pathway that leads to the morphological alterations and migration pattern characteristic of PDGF-BB transformed NIH/sis and NIH/COL1A1 fibroblasts. Furthermore, our data indicated that the small Rho-GTPase, Rac1 is the predominant mediator of these signals downstream of PI3K.

The study of the IFN-γ induced activation of monocytic U-937 cells showed that upregulation of the high affinity receptor for IgG (FcγRI) is dependent on the coordination of several regulatory events: the PKR-mediated serine 727 phosphorylation of Stat1, the expression of the hematopoietic lineage specific transcription factor PU.I, and the activation of the NFκB pathway.

ATRA-induced differentiation and cell cycle arrest are impaired in U-937 sublines expressing phosphorylation deficient Stat1 (Stat1Y701F and Stat1S727A). The findings in paper III indicated that the expression pattern of the myeloid specific transcription factors Stat2, ICSBP and c/EBPε was altered in the sublines and that intact Stat1 activation is critical for maintaining the balance of the transcriptional network during ATRA induced terminal differentiation.

Finally, ATRA-induced differentiation and growth arrest were blocked by treatment with the IKKα/β inhibitor BMS345541 or by ectopic expression of the NFκB super repressor IκBα (S32A/S36A). The fact that IκB(AA) sublines differentiated normally in response to vitamin D3, showed that NFκB inhibition specifically affected ATRA induced responses. Notably we suggest that the activity of the NFκB pathway may interfere with the differentiation process via a direct effect on the RAR/RXR mediated transcription.

Tennigkeit, Frank. "Intrinsic membrane properties affecting signal transformation in auditory thalamic neurons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34633.pdf.

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Fotinopoulos, Ioannis. "Root moments : a non-linear transformation technique with applications in signal processing." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396276.

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Morimoto, Mai. "Signal transformation at the input and output of the Drosophila visual system." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267911.

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A key function of the nervous system is to sample data from the external world, generate internal signals, and transform them into meaningful information that can be used to trigger behaviour. In order to gain insight into the underlying mechanism for signal transformation, the visual system has been extensively studied: partly owing to the stimulus being reliably presentable, and the anatomy being well described. The Drosophila visual system is one such system, with the added advantage of genetic tractability. In this thesis, I studied the filtering property of visual neurons at two levels, biophysical and circuit levels. The first study looks at signal transformation at the biophysical level, at the input of the visual system, in photoreceptors. Voltage-gated potassium channels counteract the depolarization caused by opening of light sensitive channels, and the heterogeneous properties of their kinetics can fine-tune the photoreceptor’s frequency response to fulfill the animal’s ecological requirements. Shaker (Kv1) and Shab (Kv2) have been identified as fast and slow inactivating components of the photoreceptor’s outward currents, however a current with intermediate kinetics (IKf) has not been molecularly identified, but had been postulated to be Shal (Kv4). I focused on characterizing this current using whole-cell patch clamp in wild type and mutants, and using antibodies for Shal. My results from whole-cell patch clamp indicated that IKf in adult R1-6 cells are not Shal, from their voltage dependence and insensitivity to a Kv4 blocker. This calls for alternative molecular basis for IKf, which is likely to be a slow inactivating component of Shaker, or a combination of its many splice variants. The second study looks at signal transformation at the circuit level, at the output end, in the third optic neuropil, lobula. Visual projection neurons project from the lobula to the central brain, and have been proposed to carry behaviourally relevant visual features to higher brain regions. It was recently shown that optogenetic activation of individual visual projection neuron types could induce distinct behaviours such as takeoff and backward walking, linking these visual neurons to specific behavioural programs downstream. Using in vivo two-photon calcium imaging, I recorded visually evoked calcium responses from three of these cell types. Cell types that showed induced takeoff and backward walking preferentially responded to dark looming stimuli or fragmented expanding local features, suggesting their role in behaviours triggered by object approach. To explore how this visual information is transformed in the downstream circuit, we identified several candidate neurons that receive input from this cell type by anatomical overlap, and then validated their connections using optogenetic activation and calcium imaging. One downstream cell-type that projects bilaterally had very similar response properties to its upstream partner, whereas another cell-type that projects ipsilaterally seemed to filter out some information from its upstream partner. This is one of the first studies that functionally characterizes lobula visual projection neurons and their downstream partners in Drosophila, and their response properties agree with the general idea that visual information becomes increasingly selective as it is sent to higher brain regions.

Cheng, Wai-sheung. "PTEN-PKB in endometriosis and related malignant transformation /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31540764.

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JEFFRIES, SHAWN. "THE ROLE OF NUCLEAR LOCALIZATION AND N ^ic -PROTEIN COMPLEX FORMATION IN NOTCH INDUCED NEOPLASIA." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1107384497.

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Ráček, Tomáš. "Prahovací pravidla pro potlačování šumu ve zvukových signálech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218274.

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The master's thesis focuses on the study of algorithms dealing with noise separation from musical signal. The first chapter is an introduction into methods which are used for noise removal of the musical signal. Furthermore, this chapter describes theory to the issue, specifically a description of transformations for converting from time to frequency domain, and finally thresholding method of spectral coefficients is explained in detail. The aim of the second chapter is an analysis of the proposed algorithm, which is engaged in testing. From the beginning fast algorithms of gradual transformation are described and then a detailed description of the algorithm as a whole. Later, this chapter deals with the selection of audio recordings and with preparation of these recordings for the actual testing. Finally, testing of audio samples is presented in the third chapter of this thesis. This chapter also concludes comparison of individual transformations, achieved results and review of algorithm.

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Books on the topic "Transformation du signal":

Noah, Isakov, and Segal Shraga 1939-2006, eds. Lymphocyte activation and signal transduction, 2007. Trivandrum, Kerala, India: Transworld Research Network, 2007.

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Noah, Isakov, and Segal Shraga 1939-2006, eds. Lymphocyte activation and signal transduction, 2007. Trivandrum, Kerala, India: Transworld Research Network, 2007.

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Lange, Jörg, and Tatjana Lange. Fourier-Transformation zur Signal- und Systembeschreibung. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-24850-5.

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Malvar, Henrique S. Signal processing with lapped transforms. Boston: Artech House, 1991.

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Lange, Jörg, and Tatjana Lange. Fourier Transformation for Signal and System Description. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-33817-6.

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Mironovskiĭ, L. A. Strip-method for image and signal transformation. Berlin: De Gruyter, 2011.

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Slaev, Valery A. Strip-method for image and signal transformation. Berlin: De Gruyter, 2011.

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Thomas, H. Michael. Analog signal processing. Needham Heights, MA: Simon & Schuster Custom Pub., 1991.

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Achilles, Dietmar. Die Fourier-Transformation in der Signalverarbeitung: Kontinuierliche und diskrete Verfahren der Praxis. 2nd ed. Berlin: Springer, 1985.

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Kosower, Edward M. Molecular mechanisms for sensory signals: Recognition and transformation. Princeton, N.J: Princeton University Press, 1991.

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Book chapters on the topic "Transformation du signal":

Weik, Martin H. "signal transformation." In Computer Science and Communications Dictionary, 1586. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_17412.

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Frey, Thomas, and Martin Bossert. "Die z-Transformation." In Signal- und Systemtheorie, 73–105. Wiesbaden: Vieweg+Teubner, 2008. http://dx.doi.org/10.1007/978-3-8348-9292-8_4.

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Frey, Thomas, and Martin Bossert. "Die z-Transformation." In Signal- und Systemtheorie, 73–105. Wiesbaden: Vieweg+Teubner Verlag, 2004. http://dx.doi.org/10.1007/978-3-322-96727-5_4.

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Lange, Dieter. "LAPLACE-Transformation." In Methoden der Signal- und Systemanalyse, 156–68. Wiesbaden: Vieweg+Teubner Verlag, 1985. http://dx.doi.org/10.1007/978-3-322-83936-7_16.

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Lange, Dieter. "FOURIER-Transformation." In Methoden der Signal- und Systemanalyse, 20–31. Wiesbaden: Vieweg+Teubner Verlag, 1985. http://dx.doi.org/10.1007/978-3-322-83936-7_3.

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Lange, Dieter. "LAPLACE-Transformation." In Methoden der Signal- und Systemanalyse, 156–68. Wiesbaden: Vieweg+Teubner Verlag, 1986. http://dx.doi.org/10.1007/978-3-663-14028-3_16.

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Lange, Dieter. "FOURIER-Transformation." In Methoden der Signal- und Systemanalyse, 20–31. Wiesbaden: Vieweg+Teubner Verlag, 1986. http://dx.doi.org/10.1007/978-3-663-14028-3_3.

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Frey, Thomas, and Martin Bossert. "Die Laplace- und Fourier-Transformation." In Signal- und Systemtheorie, 171–205. Wiesbaden: Vieweg+Teubner, 2008. http://dx.doi.org/10.1007/978-3-8348-9292-8_6.

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Frey, Thomas, and Martin Bossert. "Die Laplace- und Fourier-Transformation." In Signal- und Systemtheorie, 171–205. Wiesbaden: Vieweg+Teubner Verlag, 2004. http://dx.doi.org/10.1007/978-3-322-96727-5_6.

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Rupprecht, Werner. "Hilbert-Transformation und analytisches Signal." In Springer-Lehrbuch, 233–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-95711-6_12.

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Conference papers on the topic "Transformation du signal":

Jahns, Jurgen. "Shift-invariant binary signal transformation for optical processors." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.fp1.

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Signal processing is an interesting field for all-optical digital computing. One reason for this is the fact that signal processing operations can be pipelined very efficiently. This eliminates the need for a complex memory system as it is required for general purpose systems. For example, we consider the M-transformation. The M-transformation is a binary signal transformation which requires only the implementation of AND and OR operations. It belongs to a class of shift-invariant transformations which are described in Ref. 1. The property of shift-invariance makes it interesting for pattern recognition applications. We propose an optical implementation for 2-D signals, which is based on the use of crossover interconnections.

Li, Wei, Guang Dai, Ying Zhang, Feifei Long, and Yanru Wang. "Empirical Mode Decomposition of AE Signal Processing Based on Hilbert-Huang Transformation." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77001.

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In this paper a new signal processing method of Hilbert-Huang transform is applied to analyze AE lead-breaking signals and loaded concrete AE signals. Empirical model of decomposition (EMD) and cubic interpolation were used in AE signals analysis which was based on the local characteristic time scale. After the decomposition inherent model function (IMF) can effectively preserve non-linear and non-stationary features of signals during the processing. Meanwhile, noises of signals were eliminated by using multi-dimension filter property of EMD. The above two signal’s IMF can be clearly shown on a time-frequency vs. energy distribution spectrum and marginal spectrum by Hilbert-Huang transformation. The results show that HHT can efficiently reflecting the intrinsic properties of signals. Besides, HHT method, which is more adaptive than other methods, had a bigger superiority in adaptability and frequency concentration, and it has batter localization property and visual result of the time-frequency domain.

Sampson, S., S. Ramaswamy, C. Alcorn, N. Haddad, D. Lawson, T. Page, G. Scandalis, T. Scott, P. Robinson, and D. Bain. "Radiation tolerant digital signal processor transformation." In 1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403). IEEE, 1999. http://dx.doi.org/10.1109/aero.1999.793171.

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Singh, Virendra, and Manini Singh. "Analysis and transformation of image using spectral transformation technique." In 2010 International Conference on Signal and Image Processing (ICSIP). IEEE, 2010. http://dx.doi.org/10.1109/icsip.2010.5697451.

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Bazaei, Ali, and S. O. Reza Moheimani. "Improving transient performance of signal transformation approach." In 2012 IEEE 51st Annual Conference on Decision and Control (CDC). IEEE, 2012. http://dx.doi.org/10.1109/cdc.2012.6426029.

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Liu, Lina, and Jishun Jiang. "Using stationary wavelet transformation for signal denoising." In 2011 Eighth International Conference on Fuzzy Systems and Knowledge Discovery (FSKD 2011). IEEE, 2011. http://dx.doi.org/10.1109/fskd.2011.6020040.

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Ritcey, James A., L. E. Atlas, R. J. Marks, D. C. Park, and S. Oh. "Parametric transformation." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.fk2.

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The parametric transformation is investigated to achieve invariance in optical pattern recognition. Two or more appropriately chosen feature vectors are parametrically combined to form a training vector. If chosen correctly, the training vector can be invariant under operations such as shift, scale, and transposition. As a simple and pedagogical shift-invariant example, consider a signal X(t) and its low- and high-pass-filtered versions, XLP(t) and xHP(t). Visualize a template formed by a parametric plot of these two functions on the (XLP, xhp) plane. Consider a shifted signal, X ^ ( t ) = X ( t − t 0 ) . We analogously form X ^ LP ( t ) and X ^ HP ( t ) on the (xLP, xHP) plane resulting in the same trajectory as that of the template. This concept can be extended to two dimensions to achieve rotation, shift, and scale invariance. To reduce the occurrence of false classification, the dimension of the parametric transformation can be increased. Indeed, for many cases of Importance, the parametric transformation becomes invertible to a member of the categorization class in the limit as the number of dimensions grows. When invertible, there are no false alarms due to the algorithm structure.

Bazargani, H. Pishvai, M. R. Fernández-Ruiz, and J. Azaña. "Tunable optical filter using photonic Hilbert transformation." In Signal Processing in Photonic Communications. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/sppcom.2013.spm4d.6.

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Lu, Xizhao, Zhenheng Lin, Yuanqing Huang, and Zhenheng Lin. "Michelson Interferometer Signal Processing Based on Wavelet Transformation." In 2009 Symposium on Photonics and Optoelectronics. IEEE eXpress Conference Publishing, 2009. http://dx.doi.org/10.1109/sopo.2009.5230192.

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Kryachko, A. F., S. V. Dvornikov, and A. V. Pshenichnikov. "Theoretical Aspects to Signal Quadrature Constellation Diagrams Transformation." In 2019 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO). IEEE, 2019. http://dx.doi.org/10.1109/synchroinfo.2019.8814154.

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Reports on the topic "Transformation du signal":

Martin, W. M., and Nussberger. The Signal Regiment Transformation: Elements Needed to Succeed. Fort Belvoir, VA: Defense Technical Information Center, February 2006. http://dx.doi.org/10.21236/ada491884.

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Schleifer, John. Army Transformation - Assessing the Implications on Signal Organizations. Fort Belvoir, VA: Defense Technical Information Center, March 2005. http://dx.doi.org/10.21236/ada432778.

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Ron, Eliora, and Eugene Eugene Nester. Global functional genomics of plant cell transformation by agrobacterium. United States Department of Agriculture, March 2009. http://dx.doi.org/10.32747/2009.7695860.bard.

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The aim of this study was to carry out a global functional genomics analysis of plant cell transformation by Agrobacterium in order to define and characterize the physiology of Agrobacterium in the acidic environment of a wounded plant. We planed to study the proteome and transcriptome of Agrobacterium in response to a change in pH, from 7.2 to 5.5 and identify genes and circuits directly involved in this change. Bacteria-plant interactions involve a large number of global regulatory systems, which are essential for protection against new stressful conditions. The interaction of bacteria with their hosts has been previously studied by genetic-physiological methods. We wanted to make use of the new capabilities to study these interactions on a global scale, using transcription analysis (transcriptomics, microarrays) and proteomics (2D gel electrophoresis and mass spectrometry). The results provided extensive data on the functional genomics under conditions that partially mimic plant infection and – in addition - revealed some surprising and significant data. Thus, we identified the genes whose expression is modulated when Agrobacterium is grown under the acidic conditions found in the rhizosphere (pH 5.5), an essential environmental factor in Agrobacterium – plant interactions essential for induction of the virulence program by plant signal molecules. Among the 45 genes whose expression was significantly elevated, of special interest is the two-component chromosomally encoded system, ChvG/I which is involved in regulating acid inducible genes. A second exciting system under acid and ChvG/Icontrol is a secretion system for proteins, T6SS, encoded by 14 genes which appears to be important for Rhizobium leguminosarum nodule formation and nitrogen fixation and for virulence of Agrobacterium. The proteome analysis revealed that gamma aminobutyric acid (GABA), a metabolite secreted by wounded plants, induces the synthesis of an Agrobacterium lactonase which degrades the quorum sensing signal, N-acyl homoserine lactone (AHL), resulting in attenuation of virulence. In addition, through a transcriptomic analysis of Agrobacterium growing at the pH of the rhizosphere (pH=5.5), we demonstrated that salicylic acid (SA) a well-studied plant signal molecule important in plant defense, attenuates Agrobacterium virulence in two distinct ways - by down regulating the synthesis of the virulence (vir) genes required for the processing and transfer of the T-DNA and by inducing the same lactonase, which in turn degrades the AHL. Thus, GABA and SA with different molecular structures, induce the expression of these same genes. The identification of genes whose expression is modulated by conditions that mimic plant infection, as well as the identification of regulatory molecules that help control the early stages of infection, advance our understanding of this complex bacterial-plant interaction and has immediate potential applications to modify it. We expect that the data generated by our research will be used to develop novel strategies for the control of crown gall disease. Moreover, these results will also provide the basis for future biotechnological approaches that will use genetic manipulations to improve bacterial-plant interactions, leading to more efficient DNA transfer to recalcitrant plants and robust symbiosis. These advances will, in turn, contribute to plant protection by introducing genes for resistance against other bacteria, pests and environmental stress.

Delmer, Deborah P., Douglas Johnson, and Alex Levine. The Role of Small Signal Transducing Gtpases in the Regulation of Cell Wall Deposition Patterns in Plants. United States Department of Agriculture, August 1995. http://dx.doi.org/10.32747/1995.7570571.bard.

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The combined research of the groups of Delmer, Levine and Johnson has led to a number of interesting findings with respect to the function of the small GTPase Rac in plants and also opened up new leads for future research. The results have shown: 1) The Rac13 protein undergoes geranylgeranlyation and is also translocated to the plasma membrane as found for Rac in mammals; 2) When cotton Rac13 is highly- expressed in yeast, it leads to an aberrant phenotype reminiscent of mutants impaired in actin function, supporting a role for Rac13 in cytoskeletal organization; 3) From our searches, there is no strong evidence that plants contain homologs of the related CDC42 genes found in yeast and mammals; 4) We have identified a rather unique Rac gene in Arabidopsis that has unusual extensions at both the N- and C-terminal portions of the protein; 5) New evidence was obtained that an oxidative burst characterized by substantial and sustained production of H202 occurs coincident with the onset of secondary wall synthesis in cotton fibers. Further work indicates that the H202 produced may be a signal for the onset of this phase of development and also strongly suggests that Rac plays an important role in signaling for event. Since the secondary walls of plants that contain high levels of lignin and cellulose are the major source of biomass on earth, understanding what signals control this process may well in the future have important implications for manipulating the timing and extent of secondary wall deposition. 6) When the cotton Rac13 promoter is fused to the reporter gene GUS, expression patterns in Arabidopsis indicate very strong and specific expression in developing trichomes and in developing xyelm. Since both of these cell types are engaged in secondary wall synthesis, this further supports a role for Rac in signaling for onset of this process. Since cotton fibers are anatomically defined as trichomes, these data may also be quite useful for future studies in which the trichomes of Arabidopsis may serve as a model for cotton fiber development; the Rac promoter can therefore be useful to drive expression of other genes proposed to affect fiber development and study the effects on the process; 7) The Rac promoter has also been shown to be the best so far tested for use in development of a system for transient transformation of developing cotton fibers, a technique that should have many applications in the field of cotton biotechnology; 8) One candidate protein that may interact with Rac13 to be characterized further in the future is a protein kinase that may be analogous to the PAK kinase that is known to interact with Rac in mammals.

Newton, Ronald, Joseph Riov, and John Cairney. Isolation and Functional Analysis of Drought-Induced Genes in Pinus. United States Department of Agriculture, September 1993. http://dx.doi.org/10.32747/1993.7568752.bard.

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Drought is a common factor limiting timber production in the U.S. and Israel. Loblolly (Pinus taeda) and alleppo pine (Pinus halepensis) seedling survival is reduced when out planted, and growth and reproduction are often hindered by periodic droughts during later stages of tree development. Molecular and gene responses to drought stress have not been characterized. The objectives were to characterize drought-induced gene clones from these pines, to determine the effects of a growth regulator on drought tolerance, ABA levels, and drought-induced gene expression in alleppo pine, and to develop procedures for loblolly pine transformation. Nearly 20 cDNA clones influenced by gradual, prolonged drought stress have been isolated. Many of these have been shown to be induced by drought stress, whereas several others are down-regulated. These are the first drought-induced genes isolated from a pine species. Two genomic clones (lp5-1 and lp3-1) have been sequenced and characterized, and each has been found to be associated with a gene family. Clone lp5 appears to code for a cell wall protein, and clone lp3 codes for a nuclear protein. The former may be associated with changing the elastic properties of the cell wall, while the latter may be involved in signal transduction and/or protection from desiccation in the nucleus. Clone lp3 is similar to a drought-induced gene from tomato and is regulated by ABA. Several DNA sequences that are specific to induction during growth-retardation in alleppo pine by uniconazole have been identified. The active DNA species is now being identified. Promoters from genomic clones, lp3 and lp5, have been sequenced. Both are functional when fused with the gus reporter gene and transferred to other plant tissues as well as responding to a simulated drought stress. Through exodeletion analysis, it has been established that the promoter ABRE element of lp3 responds to ABA and that drought-induction of lp3 expression may also involve ABA. Stable tobacco transformants carrying either the lp5 or the lp3 promoter fused to a reporter gus gene have been obtained. The lp5lgus fusion was expressed at several stages of tobacco development and differentiation including the reproductive stage. There was no difference in phenotype between the transformants and the wild type. Embryogenesis procedures were developed for slash pine, but attempts to couple this process with gene transfer and plantlet transformation were not successful. Transformation of pine using Agrobacterium appears tractable, but molecular data supporting stable integration of the Agrobacterium-transferred gene are still inconclusive.

Perl, Avichai, Bruce I. Reisch, and Ofra Lotan. Transgenic Endochitinase Producing Grapevine for the Improvement of Resistance to Powdery Mildew (Uncinula necator). United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568766.bard.

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The original objectives are listed below: 1. Design vectors for constitutive expression of endochitinase from Trichoderma harzianum strain P1. Design vectors with signal peptides to target gene expression. 2. Extend transformation/regeneration technology to other cultivars of importance in the U.S. and Israel. 3. Transform cultivars with the endochitinase constructs developed as part of objective 1. A. Characterize foliar powdery mildew resistance in transgenic plants. Background of the topic Conventional breeding of grapevines is a slow and imprecise process. The long generation cycle, large space requirements and poor understanding of grapevine genetics prevent rapid progress. There remains great need to improve existing important cultivars without the loss of identity that follows from hybridization. Powdery mildew (Uncinula necator) is the most important fungal pathogen of grapevines, causing economic losses around the world. Genetic control of powdery mildew would reduce the requirement for chemical or cultural control of the disease. Yet, since the trait is under polygenic control, it is difficult to manipulate through hybridization and breeding. Also, because grapevines are heterozygous and vegetatively propagated cultivar identity is lost in the breeding process. Therefore, there is great need for techniques to produce transgenic versions of established cultivars with heterologous genes conferring disease resistance. Such a gene is now available for control of powdery mildew of grapevines. The protein coded by the Endochitinase gene, derived from Trichoderma harzianum, is very effective in suppressing U. necator growth. The goal of this proposal is to develop transgenic grapevines with this antifungal gene, and to test the effect of this gene on resistance to powdery mildew. Conclusions, achievements and implications Gene transfer technology for grape was developed using commercial cultivars for both wine and table grapes. It paved the way for a new tool in grapevine genetic studies enabling the alteration of specific important traits while maintaining the essential features of existing elite cultivars. Regeneration and transformation technologies were developed and are currently at an advanced stage for USA wine and Israeli seedless cultivars, representing the cutting edge of grape genetic engineering studies worldwide. Transgenic plants produced are tested for powdery mildew resistance in greenhouse and field experiments at both locations. It is our ultimate goal to develop transgenic grapes which will be more efficient and economical for growers to produce, while also providing consumers with familiar products grown with reduced chemical inputs.

Research Institute (IFPRI), International Food Policy. Malawi’s challenging employment landscape: Any signs of structural transformation? Synopsis. Washington, DC: International Food Policy Research Institute, 2019. http://dx.doi.org/10.2499/p15738coll2.133259.

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Elizur, Abigail, Amir Sagi, Gideon Hulata, Clive Jones, and Wayne Knibb. Improving Crustacean Aquaculture Production Efficiencies through Development of Monosex Populations Using Endocrine and Molecular Manipulations. United States Department of Agriculture, June 2010. http://dx.doi.org/10.32747/2010.7613890.bard.

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Background Most of Australian prawn aquaculture production is based on P. monodon. However, the Australian industry is under intense competition from lower priced overseas imports. The availability of all-female monosex populations, by virtue of their large size and associated premium prize, will offer competitive advantage to the industry which desperately needs to counteract competitors within this market. As for the redclaw production in Israel, although it is at its infancy, the growers realized that the production of males is extremely advantageous and that such management strategy will change the economic assumptions and performances of this aquaculture to attract many more growers. Original objectives (as in original proposal) Investigating the sex inheritance mechanism in the tiger prawn. Identification of genes expressed uniquely in the androgenic gland (AG) of prawns and crayfish. The above genes and/or their products will be used to localize the AG in the prawn and manipulate the AG activity in both species. Production of monosex populations through AG manipulation. In the prawn, production of all-female populations and in the crayfish, all-male populations. Achievements In the crayfish, the AG cDNA library was further screened and a third AG specific transcript, designated Cq-AG3, had been identified. Simultaneously the two AG specific genes, which were previously identified, were further characterized. Tissue specificity of one of those genes, termed Cq-AG2, was demonstrated by northern blot hybridization and RNA in-situ hybridization. Bioinformatics prediction, which suggested a 42 amino acid long signal anchor at the N-terminus of the deduced Cq-AG2, was confirmed by immunolocalization of a recombinant protein. Cq-IAG's functionality was demonstrated by dsRNA in-vivo injections to intersex crayfish. Cq-IAGsilencing induced dramatic sex-related alterations, including male feature feminization, reduced sperm production, extensive testicular apoptosis, induction of the vitellogeningene expression and accumulation of yolk proteins in the ovaries. In the prawn, the AG was identified and a cDNA library was created. The putative P. monodonAG hormone encoding gene (Pm-IAG) was identified, isolated and characterized for time of expression and histological localization. Implantation of the AG into prawn post larvae (PL) and juveniles resulted in phenotypic transformation which included the appearance of appendix masculina and enlarged petasma. The transformation however did not result in sex change or the creation of neo males thus the population genetics stage to be executed with Prof. Hulata did not materialized. Repeated AG implantation is currently being trialed. Major conclusions and Implications, both scientific and agricultural Cq-IAG's involvement in male sexual differentiation had been demonstrated and it is strongly suggested that this gene encodes an AG hormone in this crayfish. A thorough screening of the AG cDNA library shows Cq-IAG is the prominent transcript within the library. However, the identification of two additional transcripts hints that Cq-IAG is not the only gene mediating the AG effects. The successful gene silencing of Cq-IAG, if performed at earlier developmental stages, might accomplish full and functional sex reversal which will enable the production of all-male crayfish populations. Pm-IAG is likely to play a similar role in prawns. It is possible that repeated administration of the AG into prawn will lead to the desired full sex reversal, so that WZ neo males, crossed with WZ females can result in WW females, which will form the basis for monosex all-female population.

Dachs, Bernhard, and Matthias Weber. National recovery packages, innovation, and transformation. Project for the Austrian Council for Research and Technology Development. Rat für Forschung und Technologieentwicklung, January 2022. http://dx.doi.org/10.22163/fteval.2022.604.

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The COVID-19 pandemic hit Europe hard, and measures to contain the spread of the COVID-19 have resulted in a deep recession in 2020. To fight this recession, national governments have mobilised considerable funds to support the economy and prepare for a rebound in the following years. In addition to national efforts, the European Commission has initiated NextGenerationEU, a 750 bn EUR package to support Europe’s recovery, and the Recovery and Resilience Facility (RRF) as its biggest component. The aim of this package is to make Europe’s economies more resilient to future challenges while supporting them in the green and digital transitions. Immediate support for the economy is important to stabilize employment and prevent vicious cycles that appeared during the Great Depression of the 1930s. However, these measures may also hamper change for good when they only aim at restoring the status quo before the crisis. Times of crisis are always times of transformation and innovation – this may also be true for the COVID-19 crisis of 2020 and 2021.The crisis may provide a good environment to push for transformative innovation. The rapid development of vaccines against COVID-19 is a strong sign for the adaptability of national innovation systems to new challenges, and the sense of urgency for change is high. However, one may also ask if national funding and the EU recovery packages are agile enough to support new ideas, new firms and new business models, as potential triggers of transformation. Against this background, the project will analyse Austria’s response to the economic effects of the crisis from an innovation and transformation perspective. In particular, the project will look at the recovery packages from the perspective of the ‘protect-prepare-transform’ framework proposed by the EU Expert group on the Societal and Economic Impact of Research and Innovation (ESIR, 2020): the need to protect the overall wellbeing of individuals during the crisis, the need to prepare for future pandemics and crises and the need to transform the European economy and society towards more resilience against future crises. The analysis will include national funds as well as Austria’s Recovery and Resilience Plan (RRP), i.e. its proposal to the Recovery and Resilience Facility (RRF) of the European Commission. This multi-level nature of the recovery measures is further complicated by regional initiatives to mobilise further resources such as EU Structural Funds to fight the COVID-19 crisis.

Loebenstein, Gad, William Dawson, and Abed Gera. Association of the IVR Gene with Virus Localization and Resistance. United States Department of Agriculture, August 1995. http://dx.doi.org/10.32747/1995.7604922.bard.

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We have reported that localization of TMV in tobacco cultivars with the N gene, is associated with a 23 K protein (IVR) that inhibited replication of several plant viruses. This protein was also found in induced resistant tissue of Nicotiana glutinosa x Nicotiana debneyi. During the present grant we found that TMV production is enhanced in protoplasts and plants of local lesion responding tobacco cultivars exposed to 35oC, parallel to an almost complete suppression of the production of IVR. We also found that IVR is associated with resistance mechanisms in pepper cultivars. We succeeded to clone the IVR gene. In the first attempt we isolated a clone - "101" which had a specific insert of 372 bp (the full length gene for the IVR protein of 23 kD should be around 700 bp). However, attempts to isolate the full length gene did not give clear cut results, and we decided not to continue with this clone. The amino acid sequence of the N-terminus of IVR was determined and an antiserum was prepared against a synthetic peptide representing amino acids residues 1-20 of IVR. Using this antiserum as well as our polyclonal antiserum to IVR a new clone NC-330 was isolated using lamba-ZAP library. This NC-330 clone has an insert of about 1 kB with an open reading frame of 596 bp. This clone had 86.6% homology with the first 15 amino acids of the N-terminal part of IVR and 61.6% homology with the first 23 amino acids of IVR. In the QIA expression system and western blotting of the expressed protein, a clear band of about 21 kD was obtained with IVR antiserum. This clone was used for transformation of Samsun tobacco plants and we have presently plantlets which were rooted on medium containing kanamycin. Hybridization with this clone was also obtained with RNA from induced resistant tissue of Samsun NN but not with RNA from healthy control tissue of Samsun NN, or infected or healthy tissue of Samsun. This further strengthens the previous data that the NC 330 clone codes for IVR. In the U.S. it was shown that IVR is induced in plants containing the N' gene when infected with mutants of TMV that elicit the HR. This is a defined system in which the elicitor is known to be due to permutations of the coat protein which can vary in elicitor strength. The objective was to understand how IVR synthesis is induced after recognition of elicitor coat protein in the signal transduction pathway that leads to HR. We developed systems to manipulate induction of IVR by modifying the elicitor and are using these elicitor molecules to isolate the corresponding plant receptor molecules. A "far-western" procedure was developed that found a protein from N' plants that specifically bind to elicitor coat proteins. This protein is being purified and sequenced. This objective has not been completed and is still in progress. We have reported that localization of TMV in tobacco cultivars with the N gene, is associated with a 23 K protein (IVR) that inhibited replication of several plant viruses. This protein was also found in induced resistant tissue of Nicotiana glutinosa x Nicotiana debneyi.