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Relevant bibliographies by topics / Sequence of impulses

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Academic literature on the topic 'Sequence of impulses'

Author: Grafiati

Published: 28 June 2021

Last updated: 5 February 2022

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Journal articles on the topic "Sequence of impulses"

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Singhose, William, Erika Ooten Biediger, Ye-Hwa Chen, and Bart Mills. "Reference Command Shaping Using Specified-Negative-Amplitude Input Shapers for Vibration Reduction." Journal of Dynamic Systems, Measurement, and Control 126, no. 1 (2004): 210–14. http://dx.doi.org/10.1115/1.1650385.

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Residual vibrations can be greatly reduced by using specially-shaped reference command signals. Input shaping is one such technique that reduces vibration by convolving a sequence of impulses with any desired reference command. Several types of useful impulse sequences have been developed. Most of these have contained only positively valued impulses. However, rise time can be improved by using some negative impulses in the sequence. Unfortunately, the use of negative impulses can excite unmodeled high modes. A new type of impulse sequence containing negative impulses is proposed. These sequences are designed to fill the performance gap between all-positive impulse sequences and the negative sequences previously developed. A proof governing the worst case scenario provides an upper bound on high-mode excitation. The resulting class of impulse sequences allows the designer to make a precise trade off between rise time and vibration reduction.

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TORRI, GIANCARLO, SERGIO RINALDI, and CARLO PICCARDI. "IMPERFECT PHASE SYNCHRONIZATION IN THE LOCOMOTOR BEHAVIOR OFHALOBACTERIUM SALINARIUM." International Journal of Bifurcation and Chaos 13, no. 10 (2003): 3085–92. http://dx.doi.org/10.1142/s0218127403008399.

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A chaotic system can be used to transform a periodic input sequence of events, e.g. impulses, into a sequence of output events. Even after transient, the output sequence is often aperiodic. In particular, it might happen that the output events are basically synchronized with the input events, but that some of them are randomly skipped from the output time series (imperfect phase synchronization [Zacks et al., 1999, 2000]). This phenomenon has been neatly observed by Schimz and Hildebrand [1992] in a rich series of experiments on the locomotor behavior of Halobacterium salinarium, where the input event was a light impulse and the output event was the reversal in the swimming direction of the bacterium. In this paper, we show that the same phenomenon occurs when classical, low dimensional chaotic oscillators are forced by a periodic sequence of impulses. This proves, on one side, that imperfect phase synchronization is a common phenomenon in chaotic oscillators subjected to periodic sequences of impulses, and, on the other side, that there are high chances that the locomotor behavior of Halobacterium salinarium can be modeled by a low dimensional deterministic model.

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Singhose, W. E., W. P. Seering, and Neil C. Singer. "Time-Optimal Negative Input Shapers." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (1997): 198–205. http://dx.doi.org/10.1115/1.2801233.

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Input shaping reduces residual vibration in computer controlled machines by convolving a sequence of impulses with a desired system command. The resulting shaped input is then used to drive the system. The impulse sequence has traditionally contained only positively valued impulses. However, when the impulses are allowed to have negative amplitudes, the rise time can be improved. Unfortunately, excitation of unmodeled high modes and overcurrenting of the actuators may accompany the improved rise time. Solutions to the problem of high-mode excitation and overcurrenting are presented. Furthermore, a simple look-up method is presented that facilitates the design of negative input shapers. The performance of negative shapers is evaluated experimentally on two systems; one driven by a piezo actuator and the other equipped with DC motors.

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Panas, Andrey I., Tao Yang, and Leon O. Chua. "Experimental Results of Impulsive Synchronization Between Two Chua's Circuits." International Journal of Bifurcation and Chaos 08, no. 03 (1998): 639–44. http://dx.doi.org/10.1142/s0218127498000437.

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Impulsive synchronization of chaotic dynamic systems has some important applications to chaotic secure communication and chaotic spread-spectrum communication systems. In this paper we present some experimental results on impulsive synchronization between two Chua's circuits. In our experiments, only one synchronizing impulse sequence is transmitted. The robustness of impulsive synchronization with respect to variations in the frequency and the width of impulses is studied. Experimental results show that robust impulsive synchronization can be achieved under noisy conditions and a 2% parameter mismatch between the driving system and the driven system. We also found that an amplified impulse sequence with a gain greater than unity can make the impulsive synchronization more robust. Moreover, we found that impulsive synchronization can be achieved with very narrow impulses.

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YANG, TAO, and LEON O. CHUA. "CHAOTIC IMPULSE RADIO: A NOVEL CHAOTIC SECURE COMMUNICATION SYSTEM." International Journal of Bifurcation and Chaos 10, no. 02 (2000): 345–57. http://dx.doi.org/10.1142/s0218127400000220.

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A chaotic impulse radio system is an ultrawide-band communication system that uses a train of very narrow baseband impulses as a carrier. In the transmitter of a chaotic impulse radio system, a message signal is modulated by two kinds of pulse carriers. Firstly, a frequency modulation is used to modulate the message signal into a subcarrier that functions as the clock pulses of a chaotic circuit. Driven by the modulated clock pulses, the chaotic circuit outputs a chaotic impulse positioning sequence which generates the positions of the carrier impulses. The specially designed chaotic circuit in the transmitter guarantees that the time intervals between the carrier impulses are chaotic. Thus the energy of the impulse carrier is distributed evenly over the entire bandwidth. In the receiver of a chaotic impulse radio system the message signal is demodulated in two stages. At the first stage, the time interval between two consecutive impulses is recovered. At the second stage, a simple algorithm based on the knowledge of the chaotic circuit in the transmitter is used to calculate partially the locations of the inner clock pulses which in turn are used to demodulate the message signal. No synchronization at any level is needed in this chaotic impulse radio system. The security of this chaotic impulse radio system depends on the hardware parameters of the chaotic circuit and the inner clock pulse train. Simulation results are presented to illustrate the design procedure of an example of this chaotic impulse radio system.

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Singh, T., and G. R. Heppler. "Shaped Input Control of a System With Multiple Modes." Journal of Dynamic Systems, Measurement, and Control 115, no. 3 (1993): 341–47. http://dx.doi.org/10.1115/1.2899108.

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This paper describes a method for limiting vibration in flexible systems that have more than one characteristic frequency and mode. It is only necessary to have knowledge of the component mode frequencies and damping ratios in order to be able to calculate the timing and magnitudes of the impulse sequence used in the shaping. Only two impulses, in the nonrobust case, or three impulses in a more robust case, are necessary regardless of the number of component frequencies. Simple tests are established to determine when this technique can be used and examples are presented.

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Antoniadis, I. "Guidance Preconditioning by an Impulse Sequence for Robust Residual Vibration Suppression." Shock and Vibration 6, no. 3 (1999): 133–45. http://dx.doi.org/10.1155/1999/250173.

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In order to suppress residual vibrations, a general method is presented for preconditioning any guidance function prior to its application to a dynamic system, by convolving it with a sequence of impulses. The approach includes first the development of the necessary design specifications for the impulse sequence, so that the robustness properties cover the widest possible variation of the system natural frequencies. Three solution methods are proposed then, with special emphasis in the achievement of the minimum possible duration time of the impulse sequence. Numerical experiments verify the effectiveness of the robustness, not only with respect to variations of the natural frequency, but also with respect to variations of a range of other linear and non-linear variables.

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KR. AGRAWAL, SHAILESH. "GENERATION OF SYNTHETIC ACCELEROGRAMS USING ENGINEERING EARTHQUAKE SOURCE MODEL." International Journal of Structural Stability and Dynamics 04, no. 04 (2004): 497–514. http://dx.doi.org/10.1142/s0219455404001343.

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The strong motion records available during an earthquake can be treated as the response of the earth as a structural system to unknown forces acting at unknown locations. Thus, if the part of the earth participating in ground motion is modeled as a known finite elastic medium, one can model the source location and forces generated during the earthquake as an inverse problem. Based on this analogy, a simple model for the earthquake source is proposed, by assuming the source to be a sequence of impulses acting at locations yet to be found. These impulses and their locations are found using the normal mode expansion along with a minimization of mean squared error. The medium is assumed to be finite, elastic, homogeneous, layered and horizontal with specified boundary conditions. Detailed results are obtained for the Uttarkashi earthquake of 20th October 1991, in India. The impulse locations are shown to be closely associated with the underlying fault mechanism. The proposed model is then used to simulate the acceleration time histories at a few recording stations. The earthquake source expressed in terms of a sequence of impulses acting at different locations is applied to a 2D finite elastic medium. The acceleration time histories found from this model agree well with with the accelerations recorded for the earthquake.

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Chatterjee, A., and A. Ruina. "A New Algebraic Rigid-Body Collision Law Based on Impulse Space Considerations." Journal of Applied Mechanics 65, no. 4 (1998): 939–51. http://dx.doi.org/10.1115/1.2791938.

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We present a geometric representation of the set of three-dimensional rigid-body collisional impulses that are reasonably permissible by the combination of non-negative post-collision separation rate, non-negative collisional compression impulse, non-negative energy dissipation and the Coulomb friction inequality. The construction is presented for a variety of special collisional situations involving special symmetry or extremes in the mass distribution, the friction coefficient, or the initial conditions. We review a variety of known friction laws and show how they do and do not fit in the permissible region in impulse space as well as comment on other attributes of these laws. We present a few parameterizations of the full permissible region of impulse space. We present a simple generalization to arbitrary three-dimensional point contact collisions of a simple law previously only applicable to objects with contact-inertia eigenvectors aligned with the surface normal and initial relative tangential velocity component (e.g., spheres and disks). This new algebraic collision law has two restitution parameters for general three-dimensional frictional single-point rigid-body collisions. The new law generates a collisional impulse that is a weighted sum of the impulses from a frictionless but nonrebounding collision and from a perfectly sticking, nonrebounding collision. We describe useful properties of our law; show geometrically the set of impulses it can predict for several collisional situations; and compare it with existing laws. For simultaneous collisions we propose that the new algebraic law be used by recursively breaking these collisions into a sequence ordered by the normal approach velocities of potential contact pairs.

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Schlegel, Miloš, and Lukáš Bláha. "Parametrization of all Three Impulse Zero Vibration Input Shapers." Solid State Phenomena 164 (June 2010): 271–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.271.

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Input shaping has been demonstrated to be a simple method of reducing vibration in many types of controlled machines. The method is implemented by convolving a command signal with an impulse sequence of input shaper to produce a shaped input that is then used to command the system. Designing the input shaper involves determining the amplitudes and timing of the impulses such that the resulting shaped commands lead to desired levels of vibration reduction. Up to now, to the best knowledge of the authors, it is known only few special types of input shapers (ZV, ZVD, ZVDk, EI, SI,...). This paper presents two general approaches for parametrization of all three impulse zero vibration input shapers.

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Dissertations / Theses on the topic "Sequence of impulses"

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Chu, Xiaoli. "Ultra-wideband direct-sequence impulse radio wireless communications /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20CHU.

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Tomešová, Tereza. "Autonomní jednokanálový deinterleaving." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445470.

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This thesis deals with an autonomous single-channel deinterleaving. An autonomous single-channel deinterleaving is a separation of the received sequence of impulses from more than one emitter to sequences of impulses from one emitter without a human assistance. Methods used for deinterleaving could be divided into single-parameter and multiple-parameter methods according to the number of parameters used for separation. This thesis primarily deals with multi-parameter methods. As appropriate methods for an autonomous single-channel deinterleaving DBSCAN and variational bayes methods were chosen. Selected methods were adjusted for deinterleaving and implemented in programming language Python. Their efficiency is examined on simulated and real data.

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Piratla, Dinakara Phaneendra Kumar. "Synchronization in Impulse Based Ultra Wideband Systems." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33654.

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In Impulse Radio based Ultra Wide Band (UWB) systems, where sub-nano second pulses are used, synchronization is very challenging because of their short pulse duration and very low duty cycle. <p> Coherent detection of ultra wide-band signals requires complex channel estimation algorithms. In impulse based UWB systems, suboptimal receivers that require no channel estimation are proposed for low data rate applications using non coherent detection of energy. This approach requires integrators that collect energy and detect the incoming stream of bits for detection and synchronization. These techniques yield reasonable performance when compared to coherent detection techniques that require complex hardware and dissipate more energy. <p> Non-coherent detection is a promising technique for low complexity, low cost and low data rate ultra-wideband communication applications like sensor area networks. In the past, several attempts have been made to characterize the performance of the energy collection receivers for synchronization using various metrics that include time of arrival and BER measurements. A comprehensive study of the synchronization problem using Probability of False Alarm is limited. <p> The current thesis attempts to characterize the synchronization problem using Probability of False Alarm and Probability of Detection under various channel models and also discusses the importance of the length of the integration window for energy collection receivers. The current work also focuses on the performance evaluation of synchronization for Impulse based UWB systems using energy capture method and modeling them using the Probability of False Alarm and Probability of Detection under various channel models. In these systems, the integration region of a receiver integrator significantly affects the bit error rate (BER) performance. The effect of the integration window on the performance of the algorithm is also studied. <p> This work also discusses the trade-offs between complexity and precision in using these algorithms for synchronization of Impulse based Direct Sequence Ultra Wideband Systems (DS-UWB). Signal to Noise Ratio vs. Probability of Detection, Probability of False Alarm are plotted for different channel models.<br>Master of Science

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Toufarová, Tereza. "Testování prostorové akustiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219093.

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This paper presents parameters of evaluation of acoustic quality of the space. It is divided into parts presenting physical principle of the origin and movement of the acoustic signal, principles of its processing with current technology and properties of the acoustic field. This is followed by an analysis of the musical part and notes on psychoacoustics. The document contains a description of relevant parameters of acoustic spaces and way in which we can reach desired results, including material analysis. The paper mainly focuses on description of relevant parameters of three acoustic spaces which were measured. The last part of the work is a program for elementary acoustical measurement, which can be provided by means of commonly accessible equipment such as a notebook or a personal computer.

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Avan, Muhammet. "Joint Frequency Offset And Channel Estimation." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610149/index.pdf.

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In this thesis study, joint frequency offset and channel estimation methods for single-input single-output (SISO) systems are examined. The performance of maximum likelihood estimate of the parameters are studied for different training sequences. Conventionally training sequences are designed solely for the channel estimation purpose. We present a numerical comparison of different training sequences for the joint estimation problem. The performance comparisons are made in terms of mean square estimation error (MSE) versus SNR and MSE versus the total training energy metrics. A novel estimation scheme using complementary sequences have been proposed and compared with existing schemes. The proposed scheme presents a lower estimation error than the others in almost all numerical simulations. The thesis also includes an extension for the joint channel-frequency offset estimation problem to the multi-input multi-output systems and a brief discussion for multiple frequency offset case is also given.

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Saleem, Rashid. "Towards an end-to-end multiband OFDM system analysis." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/towards-an-endtoend-multiband-ofdm-system-analysis(e711f32f-1ac6-4b48-8f4e-58309c0482d3).html.

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Ultra Wideband (UWB) communication has recently drawn considerable attention from academia and industry. This is mainly owing to the ultra high speeds and cognitive features it could offer. The employability of UWB in numerous areas including but not limited to Wireless Personal Area Networks, WPAN's, Body Area Networks, BAN's, radar and medical imaging etc. has opened several avenues of research and development. However, still there is a disagreement on the standardization of UWB. Two contesting radios for UWB are Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) and DS-UWB (Direct Sequence Ultra Wideband). As nearly all of the reported research on UWB hasbeen about a very narrow/specific area of the communication system, this thesis looks at the end-to-end performance of an MB-OFDM approach. The overall aim of this project has been to first focus on three different aspects i.e. interference, antenna and propagation aspects of an MB-OFDM system individually and then present a holistic or an end-to-end system analysis finally. In the first phase of the project the author investigated the performance of MB-OFDM system under the effect of his proposed generic or technology non-specific interference. Avoiding the conventional Gaussian approximation, the author has employed an advanced stochastic method. A total of two approaches have been presented in this phase of the project. The first approach is an indirect one which involves the Moment Generating Functions (MGF's) of the Signal-to-Interference-plus-Noise-Ratio (SINR) and the Probability Density Function (pdf) of the SINR to calculate the Average Probabilities of Error of an MB-OFDM system under the influence of proposed generic interference. This approach assumed a specific two-dimensional Poisson spatial/geometric placement of interferers around the victim MB-OFDM receiver. The second approach is a direct approach and extends the first approach by employing a wider class of generic interference. In the second phase of the work the author designed, simulated, prototyped and tested novel compact monopole planar antennas for UWB application. In this phase of the research, compact antennas for the UWB application are presented. These designs employ low-loss Rogers duroid substrates and are fed by Copla-nar Waveguides. The antennas have a proposed feed-line to the main radiating element transition region. This transition region is formed by a special step-generating function-set called the "Inverse Parabolic Step Sequence" or IPSS. These IPSS-based antennas are simulated, prototyped and then tested in the ane-choic chamber. An empirical approach, aimed to further miniaturize IPSS-based antennas, was also derived in this phase of the project. The empirical approach has been applied to derive the design of a further miniaturized antenna. More-over, an electrical miniaturization limit has been concluded for the IPSS-based antennas. The third phase of the project has investigated the effect of the indoor furnishing on the distribution of the elevation Angle-of-Arrival (AOA) of the rays at the receiver. Previously, constant distributions for the AOA of the rays in the elevation direction had been reported. This phase of the research has proposed that the AOA distribution is not fixed. It is established by the author that the indoor elevation AOA distributions depend on the discrete levels of furnishing. A joint time-angle-furnishing channel model is presented in this research phase. In addition, this phase of the thesis proposes two vectorial or any direction AOA distributions for the UWB indoor environments. Finally, the last phase of this thesis is presented. As stated earlier, the overall aim of the project has been to look at three individual aspects of an MB-OFDM system, initially, and then look at the holistic system, finally. Therefore, this final phase of the research presents an end-to-end MB-OFDM system analysis. The interference analysis of the first phase of the project is revisited to re-calculate the probability of bit error with realistic/measured path loss exponents which have been reported in the existing literature. In this method, Gaussian Quadrature Rule based approximations are computed for the average probability of bit error. Last but not the least, an end-to-end or comprehensive system equation/impulse response is presented. The proposed system equation covers more aspects of an indoor UWB system than reported in the existing literature.

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Yu, Hong-Wei, and 余泓緯. "Blind Signal Reception in Downlink Direct-Sequence Ultra Wideband Impulse Radio System in The Presence of Multipath Fading." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/13786846354750967302.

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碩士<br>大葉大學<br>電機工程學系<br>99<br>Ultra wideband (UWB) impulse radio (IR) system has currently being considered for several applications due to its attractive features that include low-power carrierless and ample multipath diversity. The various modulation and multiple access schemes. In this thesis deals with direct sequence (DS) binary phase shift keying (BPSK) modulation operating in the presence of multipath fading downlink channel. We first outline the attractive properties of the synchronous DS-UWB scheme and design a low-complexity RAKE mobile station (MS) receiver. However, since accurate channel information is crucial for reliable operation, thereby we propose a blind (non-data aided) channel estimator. Performance evaluations are conducted to demonstrate the accuracy (in terms of root mean square error) of the proposed channel estimation algorithm and the reliability (in terms of bit error rate) of the blind MS receiver.

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Books on the topic "Sequence of impulses"

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Barold, S. Serge. Atrioventricular conduction abnormalities and atrioventricular blocks: ECG patterns and diagnosis. Edited by Giuseppe Boriani. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0453.

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The diagnosis of first-degree and third-degree atrioventricular (AV) block is straightforward but that of second-degree AV block is more involved. Type I block and type II second-degree AV block are electrocardiographic patterns that refer to the behaviour of the PR intervals (in sinus rhythm) in sequences (with at least two consecutive conducted PR intervals) where a single P wave fails to conduct to the ventricles. Type I second-degree AV block describes visible, differing, and generally decremental AV conduction. Type II second-degree AV block describes what appears to be an all-or-none conduction without visible changes in the AV conduction time before and after the blocked impulse. The diagnosis of type II block requires a stable sinus rate, an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble type II block. The diagnosis of type II block cannot be established if the first post-block P wave is followed by a shortened PR interval or by an undiscernible P wave. A narrow QRS type I block is almost always AV nodal, whereas a type I block with bundle branch block barring acute myocardial infarction is infranodal in 60–70% of cases. All correctly defined type II blocks are infranodal. A 2:1 AV block cannot be classified in terms of type I or type II block, but it can be AV nodal or infranodal. Concealed His bundle or ventricular extrasystoles may mimic both type I or type II block (pseudo-AV block), or both

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Book chapters on the topic "Sequence of impulses"

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Tsuzaki, Minoru, Chihiro Takeshima, and Toshie Matsui. "Pitch Perception for Sequences of Impulse Responses Whose Scaling Alternates at Every Cycle." In Advances in Experimental Medicine and Biology. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-1590-9_17.

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Baron-Pałucka, Kamila. "Interpretation of the Sequences of Magnetocardiographical Images Based on Flow of Electrical Impulses through Human Heart." In Advances in Intelligent and Soft Computing. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16295-4_27.

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Kumar Sarkar, Bimal. "Entropy Based Biological Sequence Study." In Entropy and Exergy in Renewable Energy [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96615.

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SARS-CoV-2 virus strains are taken into consideration for the analysis of digitized sequences of information by means of the notions of entropy. The occurrence of a particular pattern in the corona viral sequence is paid a special attention. The incidence of genetic word is represented in a density means. The incidence frequency of the q-gram genetic word is determined with the help of finite impulse response (FIR) filter along the sequence. It is in turn, used for the determination of the probability distribution of the genetic word incidence as the input for the calculation of entropy in the sequence. The sequence entropy is further used for principal component analysis (PCA) to determine the similarity/dissimilarity between the viral sequences. We have considered seven human corona virus sequences. Entropy based similarity study for SARS-CoV-2 strains is presented in this work.

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Swami, Deb Sunder, and Kandarpa Kumar Sarma. "A logistic-Map-Based PN Sequence for Stochastic Wireless Channels." In Advances in Wireless Technologies and Telecommunication. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2342-0.ch008.

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The work in this chapter mainly focusses on a pseudo-noise (PN) sequence generator which is constructed exploiting the features of one-dimensional chaotic systems such as a logistic map. The use of logistic map to generate strong cryptographic sequences is novel in approach in terms of its use with a range of transmission techniques for wireless communication because it is easy to conceive and requires simple devices to generate the sequence. The generated sequence is used as a spreading sequence in a DS-SS modulation multipath environment with AWGN and Rayleigh fading channel, under various channel fading conditions. The BER curves and channel impulse responses are obtained and compared with the existing linear feedback shift register (LFSR) based PN sequence and Kasami sequence. Results from this comparative analysis indicate that the proposed method generally yields a greater number of reliable, unpredictable and random bits than existing techniques under the same conditions and can be practically implemented for DS-SS scheme as a spreading sequence.

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Lipsey, John R. "Antidepressants." In Psychiatric Aspects of Neurologic Diseases. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195309430.003.0023.

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Antidepressant drug therapy is the cornerstone of treatment for major depression and is usually successful (Rosenbaum et al., 2005). Fifty percent of patients respond to the first antidepressant used, and 75% respond to one of the first three agents chosen if these agents represent different antidepressant classes. Insufficient dosage and duration of therapy are the most common causes of treatment failure. The required duration for a full therapeutic trial of any antidepressant is 6 to 8 weeks, but some patients require 10 to 12 weeks to achieve maximum benefit. Every patient being treated pharmacologically for depression should be educated about the course of recovery. Even if an antidepressant is ultimately successful, improvement in the first week or two may be minimal and involve primarily improved sleep or diminished anxiety. When more substantial improvements begin later, they may vary greatly on a day-to-day basis, and patients should be forewarned that the early course of recovery may be punctuated by unexpected brief dips in mood. Patients may also find that their energy, appetite, activity level, and social engagement improve before they notice a positive change in their moods. Thus, they look much improved to their friends and families before they feel better. Eventually, however, the full range of depressive symptoms resolves, and this improvement is sustained. During the course of antidepressant treatment, all patients must be asked about new or recurrent suicidal ideas, and their families should be told to report any evidence of self-harming actions or thoughts. Suicidal ideas, perhaps held in check by lack of energy to carry them out, may potentially develop into suicidal impulses or actions if a patient’s energy improves while severely depressed mood or hopelessness persist. Five classes of antidepressants will be described below: selective serotonin reuptake inhibitors (SSRIs), the serotonin norepinephrine reuptake inhibitor (SNRI) venlafaxine, the alpha2-adrenergic antagonist mirtazapine, the norepinephrinedopamine reuptake inhibitor (NDRI) bupropion, and tricyclic antidepressants (TCAs). There is little evidence that any individual antidepressant (or antidepressant class) is generally superior to another, so the sequence of drug selection is determined primarily by tolerability and safety considerations. The SSRIs are commonly used in the initial treatment of major depression.

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Giles, Paul. "Organicist Time." In Backgazing: Reverse Time in Modernist Culture. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198830443.003.0004.

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This chapter traces how an organicist version of time was developed during the interwar period, how it reached its philosophical apogee in the work of Martin Heidegger and was treated sympathetically by American novelist Thomas Wolfe. However, this organicist impulse was kept at a distance by the writing of Theodor Adorno, Thomas Mann, and H. G. Wells, all of whom engage in dialectics with fascism. This chapter also considers how organicist models of temporal sequence inform the fixation on time in William Faulkner’s fiction, and how Sartre’s existentialism attempted to disavow what he saw as Faulkner’s backward-looking nostalgia. This kind of organicist imagination continued to resonate widely even after 1945, as we see from Anthony Powell’s sequence of novels A Dance to the Music of Time, and organicist time formed an integral backbone to many dimensions of modernist culture, even if its visibility became partially suppressed after World War II.

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Bilan, Mykola. "Image Processing and Pattern Recognition Based on Artificial Models of the Structure and Function of the Retina." In Handbook of Research on Intelligent Data Processing and Information Security Systems. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1290-6.ch014.

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The chapter considers principles of construction of retina of the eye. It proposed a system recognition of complex images that models the structure of the retina and the signals at its output. The system is capable of recognizing images and creating new classes. The time impulse description method of images using cellular automata is considered. Images are described by pulse sequences that are created with the help of specially organized cellular automata. The system allows the authors to recognize images of complex shape, which can have an arbitrary location in the field of the visual scene and can have a different scale.

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Lie, Sulgi. "Geopolitical Aesthetics." In Towards a Political Aesthetics of Cinema. Amsterdam University Press, 2020. http://dx.doi.org/10.5117/9789462983632_ch08.

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The third, most abstract allegorical level is that of the acousmatic gaze, which Jameson himself does not address, but which is implicit in his theoretical re-evaluation of the conspiracy motif. In analyzing the paranoia films of New Hollywood, I am interested in the theoretical mediation of the concepts of suture and allegory. I show that the acousmatics of these films correspond with the intransparency of social totality. The films diagnose the negativity of totality in order to make it graspable again for the subject’s capacity of imagination. In my discussion of Miami Vice, I try to sketch out how such an aesthetic of cognitive mapping is also effective under the new geopolitical conditions of globalization. In the final sequence of the film, for example, the almost melancholic recourse to the suture of shot and reverse-shot coincides with the allegorical utopia of an unrepresentable Cuba. In this sense, in Jameson’s aesthetics of the politically unconscious, the mapping of totality is always interwoven with a utopian impulse.

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Manley, Geoffrey T., John K. Yue, Hansen Deng, Ethan A. Winkler, John F. Burke, and Catherine Suen. "Pathophysiology of traumatic brain injury." In Oxford Textbook of Neurological Surgery, edited by Ramez W. Kirollos, Adel Helmy, Simon Thomson, and Peter J. A. Hutchinson. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198746706.003.0041.

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This chapter provides summative information on the biomechanics, classification, and metabolism of traumatic brain injury (TBI). Impact, impulse, static/quasistatic loading, and related biomechanical sequelae following rotational shear and strain are discussed. Morphological classifications across extradural, acute/chronic subdural, subarachnoid, and intraventricular haemorrhages, as well as cerebral contusions and axonal injuries, are characterized and correlated with injury severity. Management options and implications for penetrating TBI and mild TBI/concussion are described. Cerebral metabolism including pressure/viscosity, CO<sub>2</sub> reactivity, and autoregulation are explained in detail to provide for in-depth exploration of a spectrum of secondary injury cascades, encompassing glutamatergic excitotoxicity, autoregulatory loss, and the pressure reactivity index, flow disturbances, elevated intracranial pressure, cortical spreading depression and seizures/epilepsy. Beta-amyloid deposition in response to TBI, and genetic susceptibilities to poor recovery are covered. Current developments to standardize TBI classification systems, establish evidentiary benchmarks for quality of care, and accelerate advances in diagnosis and prognosis are highlighted.

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Barold, S. Serge. "Atrioventricular conduction abnormalities and atrioventricular blocks: ECG patterns and diagnosis." In ESC CardioMed, edited by Giuseppe Boriani. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0453_update_001.

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The diagnosis of first-degree and third-degree atrioventricular (AV) block is straightforward but that of second-degree AV block is more involved. Type I block and type II second-degree AV block are electrocardiographic patterns that refer to the behaviour of the PR intervals (in sinus rhythm) in sequences (with at least two consecutive conducted PR intervals) where a single P wave fails to conduct to the ventricles. Type I second-degree AV block describes visible, differing, and generally decremental AV conduction. Type II second-degree AV block describes what appears to be an all-or-none conduction without visible changes in the AV conduction time before and after the blocked impulse. The diagnosis of type II block requires a stable sinus rate, an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble type II block. The diagnosis of type II block cannot be established if the first post-block P wave is followed by a shortened PR interval or by an undiscernible P wave. A narrow QRS type I block is almost always AV nodal, whereas a type I block with bundle branch block barring acute myocardial infarction is infranodal in 60–70% of cases. All correctly defined type II blocks are infranodal. A 2:1 AV block cannot be classified in terms of type I or type II block, but it can be AV nodal or infranodal. Concealed His bundle or ventricular extrasystoles may mimic both type I or type II block (pseudo-AV block), or both

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Conference papers on the topic "Sequence of impulses"

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Georgiou, Ioannis. "Proper Othrogonal Decomposition of Collocated Signals for Detection of Damage in an Aircraft Propeller." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3820.

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The powerful data-driven analysis furnished by the Proper Orthogonal Decomposition Transform (POD) reveals that ensembles of collocated acceleration signals associated with a sequence of point impulses applied over a backbone curve of a propeller are underlined by a high degree of spatiotemporal coherence, a fact reflecting Maxwell’s reciprocity principle. Thus collocated signals seem to furnish a true spatiotemporal sample of transient response to a point impulse of complex structures such as propellers. In view of this fact, three sensors are placed on an installed propeller to collect collocated signals at the blades and hub for damage detection. Preliminary results indicate that abnormality indicators present in the dominant POD mode of the ensembles of collocated signals are related directly to the presence of damage at the tip of a propeller blade.

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Babitsky, V. I. "Hand-Held Percussion Machine As an Optimal Converter." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8179.

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Abstract The problem of interaction of hand-held percussion machine with operator and load is presented and optimized as a problem of dynamical conversion of the operator effort into sequence of impulses produced with the help of machine drive. Some recommendations on the estimation of the main characteristics of the machine design are presented.

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Ceko, Matthew, Mustafa Hamid, Imants Svalbe, Timothy Petersen, and Andrew Tirkel. "Impulse-Equivalent Sequences and Arrays." In 2018 Digital Image Computing: Techniques and Applications (DICTA). IEEE, 2018. http://dx.doi.org/10.1109/dicta.2018.8615822.

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Banket, Victor, and Sergei Manakov. "Composite Walsh-Barker Sequences." In 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS). IEEE, 2018. http://dx.doi.org/10.1109/uwbusis.2018.8520220.

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Yang, Chunhua, Wenyuan Li, Yifang Zeng, and Xiaoyun Jiang. "Impulse Response Measurements Using Gold Sequences." In 2006 8th international Conference on Signal Processing. IEEE, 2006. http://dx.doi.org/10.1109/icosp.2006.346070.

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Li, Houyi, Banghe Han, Ying Li, and Junming Li. "Impulse-Response Model for Human Behaviors Sequences." In 2015 IEEE International Conference on Data Mining Workshop (ICDMW). IEEE, 2015. http://dx.doi.org/10.1109/icdmw.2015.116.

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Si, Chen, Zhang Bang-ning, Guo Dao-Shen, and Li yi-ning. "Performance of Impulse Radio and Direct-sequence Impulse Radio in the Presence of Interference." In 2006 International Conference on Communication Technology. IEEE, 2006. http://dx.doi.org/10.1109/icct.2006.341749.

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Wang, C., R. Ying, Y. Wei, and Y. Yang. "Spreading sequence selection scheme for NBI suppression IN DS-UWB systems." In 2010 5th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS). IEEE, 2010. http://dx.doi.org/10.1109/uwbusis.2010.5609145.

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Gui, Yu. "Study on the DC-DC Converter with Impulse Sequence Control." In 2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM). IEEE, 2012. http://dx.doi.org/10.1109/cdciem.2012.163.

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Tamgnoue, V., V. Moeyaert, S. Bette, and P. Megret. "Performance Analysis of Direct Sequence CDMA in Impulse Noise Channel." In 2006 Symposium on Communications and Vehicular Technology. IEEE, 2006. http://dx.doi.org/10.1109/scvt.2006.334375.

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Reports on the topic "Sequence of impulses"

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Cooper, Gene R. The Effects of Aerodynamic Jump Caused by a Uniform Sequence of Lateral Impulses. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada425205.

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