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Добірка наукової літератури з теми "TIME-DOMAIN CHANNEL"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "TIME-DOMAIN CHANNEL"

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Huang, Sheng Bo, Yu Cang Wen, Wen Ye, and Tong Liang Fan. "A Simplified Time-Domain Channel Estimation Approach for OFDM System." Applied Mechanics and Materials 738-739 (March 2015): 1111–14. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.1111.

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Анотація:
OFDM usually incorporates pilot tones in the frequency domain (FD) or training symbols in the time-domain (TD) to facilitate channel estimation algorithms. TD channel estimation becomes more attractive in quasi-static channels because channel estimation scheme will optimize the spectral efficiency by re-using the training symbols designated for FD channel estimation. A channel estimation method based on time domain averaging algorithm is proposed. Due to the principle of centralized energy in time domain, the effective channel impulse response length can be detected by setting of threshold for the estimated channel impulse response length. Computer simulation demonstrates the performance of the proposed algorithms in terms of bit error rate performance.
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2

Ningna Yu, Ningna Yu, Zhaoyue Dong Zhaoyue Dong, Jindong Wang Jindong Wang, Zhengjun Wei Zhengjun Wei, and Zhiming Zhang Zhiming Zhang. "Impact of spontaneous Raman scattering on quantum channel wavelength-multiplexed with classical channel in time domain." Chinese Optics Letters 12, no. 10 (2014): 102703–6. http://dx.doi.org/10.3788/col201412.102703.

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3

Ivanov, V. D. "Time-Domain Instrumentation at ESO." Proceedings of the International Astronomical Union 14, S339 (November 2017): 172–75. http://dx.doi.org/10.1017/s1743921318002508.

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AbstractOver the years the European Southern Observatory (ESO) has offered a number of time-domain instruments that enable the user to achieve time resolution as small as milliseconds. They have been used for a wide range of applications, from binary studies with Lunar occultations, characterisation of X-ray binaries and exoplanet transits, to quasar variability. Furthermore, ESO provides a target-of-opportunity (ToO) rapid-response-mode (RRM) channel to trigger quick follow-up observations within as little delay as minutes after a transient has been detected. This talk reviewed the available time-domain observing modes and instruments at ESO, giving priority to FORS2, HAWKI and UltraCam. It described the ToO and RRM, and gave examples of the most common science cases that take advantage of those channels and capabilities.
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Kekalainen, Jorma. "A discrete time domain approach on time delay estimation." ACTA IMEKO 8, no. 1 (March 31, 2019): 77. http://dx.doi.org/10.21014/acta_imeko.v8i1.600.

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Анотація:
A time delay estimation method based on the discrete time domain approach is introduced here. In this dual-channel time delay estimation model, the criterion function compares the time differences of time sequences between channels, not the magnitude values of time functions as in the conventional cross-correlation method. An estimation task is formulated as an extreme value problem in discrete index space. Using the index delay giving extreme value to the criterion function, it is possible to find the best estimate for time delay distribution in the meaning of that criterion. Using this method, the estimated delay distribution and criterion function are clearly separated. Thus, there are no theoretical problems in the determination of the average time delay or velocity in the non-constant or changing time delay case as long as a sufficient statistical similarity (correlation) exists between channel signals. <p class="Abstract">The theoretical values of several criterion functions and the probability of occurrence of an anomalous estimate with the cross-covariance criterion function are derived. A basic performance analysis of the estimation method is presented. Some potential real-time supervision methods based on the use of criterion functions in the detection of the possible unreliability of the time delay estimate are outlined.</p>
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5

Asharjabi, Sami, Hefdhallah Sakran, and Azzam Al-nahari. "Time-Domain Channel Estimation Scheme for OFDM over Fast Fading Channels." Wireless Communications and Mobile Computing 2022 (February 27, 2022): 1–9. http://dx.doi.org/10.1155/2022/7839430.

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Анотація:
In high-mobility scenarios, the time variation of mobile radio channels leads to a loss of orthogonality among subcarriers in orthogonal frequency division multiplexing (OFDM) systems, resulting in intercarrier interference (ICI) and performance deterioration. Conventional channel estimation schemes are usually based on pilot tones, which are distributed in each OFDM symbol to estimate the channel variation. Hence, the channel estimator itself suffers from ICI. In this study, a new estimation scheme, which does not suffer from ICI, is proposed to estimate the channel variation within OFDM symbols. The main idea is to zero-pad (ZP) the OFDM symbol in the time domain. Then, in the middle of the ZP interval, an impulse signal is inserted as a pilot sample, which is used to estimate the channel at the pilot signal in the OFDM symbol. Finally, a linear model is used to estimate the channel variation over an OFDM symbol. Additionally, we derive the mean squared error (MSE) of the proposed estimation technique under the constraint that the channel varies linearly within OFDM symbols. Simulation results show that our scheme can achieve a substantial improvement in the bit error rate (BER) performance of OFDM, in spite of the OFDM symbol length being increased. Moreover, in many cases, the new scheme can achieve the same BER performance as the perfect knowledge of channel state information (CSI). Theoretical analysis and numerical simulations show that our scheme achieves excellent performance with much lower computational complexity.
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Vychodil, Josef, Martin Pospisil, Ales Prokes, and Jiri Blumenstein. "Millimetre wave band time domain channel sounder." IET Communications 13, no. 3 (February 19, 2019): 331–38. http://dx.doi.org/10.1049/iet-com.2018.5453.

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Park, Yongkoo, and Wonzoo Chung. "Selective Feature Generation Method Based on Time Domain Parameters and Correlation Coefficients for Filter-Bank-CSP BCI Systems." Sensors 19, no. 17 (August 30, 2019): 3769. http://dx.doi.org/10.3390/s19173769.

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Анотація:
This paper presents a novel motor imagery (MI) classification algorithm using filter-bank common spatial pattern (FBCSP) features based on MI-relevant channel selection. In contrast to existing channel selection methods based on global CSP features, the proposed algorithm utilizes the Fisher ratio of time domain parameters (TDPs) and correlation coefficients: the channel with the highest Fisher ratio of TDPs, named principle channel, is selected and a supporting channel set for the principle channel that consists of highly correlated channels to the principle channel is generated. The proposed algorithm using the FBCSP features generated from the supporting channel set for the principle channel significantly improved the classification performance. The performance of the proposed method was evaluated using BCI Competition III Dataset IVa (18 channels) and BCI Competition IV Dataset I (59 channels).
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Sevcik, Bretislav. "Time-Domain Predistortion Method Based on Raised Cosine Signaling in Real Transmission Channels." Active and Passive Electronic Components 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/596481.

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Анотація:
The concept of time-domain predistortion method based on raised cosine signaling is applied in real transmission channels. The proposed PWM-RC method uses raised-cosine pulse shaping instead of conventional rectangular digital signals and pulse-width modulation (PWM) scheme to achieve better output channel data response in harsh channel environment. The conventional predistortion methods based on pulse amplitude adjusting are not compatible with modern low-power CMOS design. Currently existing time-domain predistortion methods which are only based on a PWM scheme show many highfrequency signal harmonic components for both fast and slow signal transitions. It can cause more system crosstalk susceptibility if the crosstalk is dominant factor in transmission channel. In this case, the additional preemphasis boosted undesirable high-frequency components. Finally, the real channel transfer functions in connection with ADS Agilent development studio are used to compare the performance of proposed method with other predistortion methods.
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Sahu, O. P., M. K. Soni, and I. M. Talwar. "Time Domain Analysis of Two-Channel QMF Bank." IETE Journal of Research 51, no. 6 (November 2005): 469–75. http://dx.doi.org/10.1080/03772063.2005.11416427.

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Artigas, Jordi, Jee-Hwan Ryu, and Carsten Preusche. "Time Domain Passivity Control for Position-Position Teleoperation Architectures." Presence: Teleoperators and Virtual Environments 19, no. 5 (October 1, 2010): 482–97. http://dx.doi.org/10.1162/pres_a_00013.

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Анотація:
This article presents a method for passivating the communication channel of a symmetric position-position teleoperation architecture on the time domain. The time domain passivity control approach has recently gained appeal in the context of timedelayed teleoperation because passivity is not established as a design constraint, which often forces conservative rules, but rather as a property which the system must preserve during operation. Since passivity is a network property, the first design rule within this framework is to represent consistent and comprehensible circuit (i.e., network) representations of the mechanical teleoperation system. In particular, the energetic behavior of these networks is interesting because it allows straightforward conclusions about system stability. By means of so-called passivity observers (PO) and passivity controllers (PC) (Hannaford & Ryu, 2001), the energetic response of a delayed communication channel is captured and modulated over time so that the network in question never becomes nonpassive. The case analyzed in this paper tackles a communication channel that conveys position data back and forth. This type of channel does not offer intuitive network representation since only flows are actually being transmitted. Although energy clearly travels from one side to the other, port power identification, as defined by the correlated pair flow and effort, is not evident. This work first investigates how this kind of channel can be represented by means of circuit networks even with the lack of physical effort being transmitted through the channel, and identifies which networks are susceptible to become nonpassive due to the channel characteristics (i.e., time delay, discretization or package loss). Once achieved, a distributed control structure is presented based on a PC series that keeps the system at the verge of passivity (and therefore stability) independent from the channel properties. The results obtained by the simulation and by experiment sustain the presented approach.
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Дисертації з теми "TIME-DOMAIN CHANNEL"

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Chandna, Swati. "Frequency domain analysis and simulation of multi-channel complex-valued time series." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/29842.

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Complex-valued representation of a two-component real-valued time series yields additional physical insights that are lost otherwise. The spectral representation theorem allows us to study covariance stationary complex-valued random sequences in the frequency domain, and this is known as rotary spectral analysis. It is a widely-used technique for studying elliptical motions in ocean currents, wind etc. An important and useful parameter in rotary spectral analysis of scalar complex-valued time series is the rotary coefficient. It measures the tendency of vectors to rotate in a clockwise or counter-clockwise manner. We derive the theoretical distribution of the rotary coefficient estimator and apply our results to ocean current speed and direction measurements at six depths in the Labrador Sea. Canonical correlation techniques are commonly employed in the analysis of a pair of vector-valued random variables. We introduce a framework to extend classical multivariate analysis techniques such as canonical correlation analysis, partial least squares, and multivariate linear regression, to define coherence - a measure of correlation in the frequency domain. In the statistical analysis of complex-valued time series, we refer to a time series as proper/improper according to whether it is uncorrelated/correlated with its complex conjugate. In earlier work, complex-valued signals were assumed to be proper for the simple reason that it led to a simpler algebra. However, the loss in performance caused by overlooking the potential impropriety of such data is realized to be significant, and therefore, when the data is improper, information contained in the complementary covariance structure must be considered. Since impropriety in the time domain may not necessarily correspond to impropriety at all frequencies, we propose a generalized likelihood ratio test which may be used to test propriety of a discrete time complex-valued process at a given frequency. Finally, the idea of vector circulant embedding is exploited to yield a frequency domain bootstrap methodology. With the help of three example parameters involved in the study of multi-channel complex-valued time series, we illustrate how our method allows us to draw statistical inference such as confidence intervals. Our method can prove useful in cases where no theoretical distributional results are available, or to check the effect of nuisance parameter estimates where theoretical results are available.
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2

Prabhakaran, Anand. "Power Signal Analysis of Channel Current Signal Using HMM-EM and Time Domain FSA." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/321.

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The Nanopore Detector using á-hemolysin channel transcribes kinetics of a single molecule along the nanometer-scale pore. The transcribed data is represented by electrical measurements. We present accurate and computationally inexpensive tools to analyze single molecule kinetics. The HMM-EM level projection method de-noises data, retaining the transitions with very high precision. This approach doesn't require input number of levels. Another advantage is the minimal tuning required. The levels are then identified using Finite State Automata (FSAs). Spike Detector algorithm analyzes spikes characterizing behavior of molecule in pore. No commercial tools available are capable of analyzing spikes in presence of noise. The formulation of HMM-EM, FSAs and Spike Detector together provides a robust method for analysis of channel current data. Application of these methods is described for Vercoutere channel blockade dataset which contains signals of radiated and non-radiated molecules. The tools developed were used successfully to differentiate between these two molecules.
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Frieslaar, Ibraheem. "A multi-threading software countermeasure to mitigate side channel analysis in the time domain." Thesis, Rhodes University, 2019. http://hdl.handle.net/10962/71152.

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This research is the first of its kind to investigate the utilisation of a multi-threading software-based countermeasure to mitigate Side Channel Analysis (SCA) attacks, with a particular focus on the AES-128 cryptographic algorithm. This investigation is novel, as there has not been a software-based countermeasure relying on multi-threading to our knowledge. The research has been tested on the Atmel microcontrollers, as well as a more fully featured system in the form of the popular Raspberry Pi that utilises the ARM7 processor. The main contributions of this research is the introduction of a multi-threading software based countermeasure used to mitigate SCA attacks on both an embedded device and a Raspberry Pi. These threads are comprised of various mathematical operations which are utilised to generate electromagnetic (EM) noise resulting in the obfuscation of the execution of the AES-128 algorithm. A novel EM noise generator known as the FRIES noise generator is implemented to obfuscate data captured in the EM field. FRIES comprises of hiding the execution of AES-128 algorithm within the EM noise generated by the 512 Secure Hash Algorithm (SHA) from the libcrypto++ and OpenSSL libraries. In order to evaluate the proposed countermeasure, a novel attack methodology was developed where the entire secret AES-128 encryption key was recovered from a Raspberry Pi, which has not been achieved before. The FRIES noise generator was pitted against this new attack vector and other known noise generators. The results exhibited that the FRIES noise generator withstood this attack whilst other existing techniques still leaked out secret information. The visual location of the AES-128 encryption algorithm in the EM spectrum and key recovery was prevented. These results demonstrated that the proposed multi-threading software based countermeasure was able to be resistant to existing and new forms of attacks, thus verifying that a multi-threading software based countermeasure can serve to mitigate SCA attacks.
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Fong, Chung Yan. "Silicon-based laterally waveguide-coupled square microcavity channel add-drop filters /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20FONG.

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Анотація:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 98-103). Also available in electronic version. Access restricted to campus users.
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Kang, Guixia [Verfasser]. "Time and Frequency Domain Joint Channel Estimation in Multi-carrier Multi-branch Systems / Guixia Kang." Aachen : Shaker, 2005. http://d-nb.info/1181608228/34.

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Tsiridis, Konstantinos. "Time domain simulation MFSK communications system performance in the presence of wideband noise and co-channel interference." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA358436.

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Анотація:
Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1998.
"December 1998." Thesis advisor(s): Jovan Lebaric, Clark Robertson, David C. Jenn. Includes bibliographical references (p. 127). Also available online.
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7

Muqaibel, Ali Hussein. "Characterization of Ultra Wideband Communication Channels." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26398.

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Анотація:
Ultra-wideband (UWB) communication has been the subject of extensive research in recent years due to its unique capabilities and potential applications, particularly in short-range multiple access wireless communications. However, many important aspects of UWB-based communication systems have not yet been thoroughly investigated. The propagation of UWB signals in indoor environments is the single most important issue with significant impacts on the future direction, scope, and generally the extent of the success of UWB technology. The objective of this dissertation is to obtain a more thorough and comprehensive understanding of the potentials of UWB technology by characterizing the UWB communication channels. Channel characterization refers to extracting the channel parameters from measured data. The extracted parameters are used to quantify the effect of the channel on communication UWB systems using this channel as signal transmission medium. Data are measured in different ways using a variety of time-domain and frequency-domain techniques. The experimental setups used in channel characterization effort also include pulse generators and antennas as integral parts of the channel, since the pulse shape and antenna characteristics have significant impact on channel parameters. At a fundamental level, the propagation of UWB signals, as any electromagnetic wave, is governed, among other things, by the properties of materials in the propagation medium. One of the objectives of this research is to examine propagation through walls made of typical building materials and thereby acquire ultra-wideband characterization of these materials. The loss and the dielectric constant of each material are measured over a frequency range of 1 to 15 GHz. Ten commonly used building materials are chosen for this investigation. These include, dry wall, wallboard, structure wood, glass sheet, bricks, concrete blocks, reinforced concrete (as pillar), cloth office partition, wooden door, and styrofoam slab. The work on ultra-wideband characterization of building materials resulted in an additional interesting contribution. A new formulation for evaluating the complex dielectric constant of low-loss materials, which involves solving real equations and thus requiring only one-dimensional root searching techniques, was found. The results derived from the exact complex equation and from the new formulation are in excellent agreement. Following the characterization of building materials, an indoor UWB measurement campaign is undertaken. Typical indoor scenarios, including line-of-sight (LOS), non-line-of-sight (NLOS), room-to-room, within-the-room, and hallways, are considered. Results for indoor propagation measurements are presented for local power delay profiles (local-PDP) and small-scale averaged power delay profiles (SSA-PDP). Site-specific trends and general observations are discussed. The results for pathloss exponent and time dispersion parameters are presented. The analyses results indicate the immunity of UWB signals to multipath fading. The results also clearly show that UWB signals, unlike narrowband signals, do not suffer from small scale fading, unless the receiver is too close to walls. Multipath components are further studies by employing a deconvolution technique. The application of deconvolution results in resolving multipath components with waveforms different from those of the sounding pulse. Resolving more components can improve the design of the rake receiver. The final part of this research elaborates on the nature of multiple access interference and illustrates the application of multi-user detection to improve the performance of impulse radio systems. Measured dispersion parameters and their effects on the multiple access parameters are discussed.
Ph. D.
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8

Sklar, Alexander Gabriel. "Channel Modeling Applied to Robust Automatic Speech Recognition." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_theses/87.

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In automatic speech recognition systems (ASRs), training is a critical phase to the system?s success. Communication media, either analog (such as analog landline phones) or digital (VoIP) distort the speaker?s speech signal often in very complex ways: linear distortion occurs in all channels, either in the magnitude or phase spectrum. Non-linear but time-invariant distortion will always appear in all real systems. In digital systems we also have network effects which will produce packet losses and delays and repeated packets. Finally, one cannot really assert what path a signal will take, and so having error or distortion in between is almost a certainty. The channel introduces an acoustical mismatch between the speaker's signal and the trained data in the ASR, which results in poor recognition performance. The approach so far, has been to try to undo the havoc produced by the channels, i.e. compensate for the channel's behavior. In this thesis, we try to characterize the effects of different transmission media and use that as an inexpensive and repeatable way to train ASR systems.
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Rial, Alvaro Valcarce. "Applying the finite-difference time-domain to the modelling of large-scale radio channels." Thesis, University of Bedfordshire, 2010. http://hdl.handle.net/10547/295748.

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Finite-difference models have been used for nearly 40 years to solve electromagnetic problems of heterogeneous nature. Further, these techniques are well known for being computationally expensive, as well as subject to various numerical artifacts. However, little is yet understood about the errors arising in the simulation of wideband sources with the finitedifference time-domain (FDTD) method. Within this context, the focus of this thesis is on two different problems. On the one hand, the speed and accuracy of current FDTD implementations is analysed and increased. On the other hand, the distortion of numerical pulses is characterised and mitigation techniques proposed. In addition, recent developments in general-purpose computing on graphics processing units (GPGPU) have unveiled new methods for the efficient implementation of FDTD algorithms. Therefore, this thesis proposes specific GPU-based guidelines for the implementation of the standard FDTD. Then, metaheuristics are used for the calibration of a FDTD-based narrowband simulator. Regarding the simulation of wideband sources, this thesis uses first Lagrange multipliers to characterise the extrema of the numerical group velocity. Then, the spread of numerical Gaussian pulses is characterised analytically in terms of the FDTD grid parameters. The usefulness of the proposed solutions to the previously described problems is illustrated in this thesis using coverage and wideband predictions in large-scale scenarios. In particular, the indoor-to-outdoor radio channel in residential areas is studied. Furthermore, coverage and wideband measurements have also been used to validate the predictions. As a result of all the above, this thesis introduces first an efficient and accurate FDTD simulator. Then, it characterises analytically the propagation of numerical pulses. Finally, the narrowband and wideband indoorto-outdoor channels are modeled using the developed techniques.
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Jelzow, Alexander [Verfasser], Rainer Akademischer Betreuer] Macdonald, Ulrike [Akademischer Betreuer] [Woggon, and Jens [Akademischer Betreuer] Steinbrink. "In vivo quantification of absorption changes in the human brain by time-domain diffuse near-infrared spectroscopy / Alexander Jelzow. Gutachter: Rainer Macdonald ; Ulrike Woggon ; Jens Steinbrink. Betreuer: Rainer Macdonald." Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1067385398/34.

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Книги з теми "TIME-DOMAIN CHANNEL"

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Tsiridis, Konstantinos. Time domain simulation MFSK communications system performance in the presence of wideband noise and co-channel interference. Monterey, Calif: Naval Postgraduate School, 1998.

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2

Borzyh, Stanislav. Pananthropea. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1218149.

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Анотація:
The monograph is dedicated to the supercontinent Pananthropea, which was created by the efforts of people, and therefore is named in his honor. It consists of all purely geographical continents, as well as all land areas, representing a single organism that functions exactly as a whole, but at the same time divided by nature itself. The relevance of this approach is shown as follows, as described in the three chapters of the text. First, it demonstrates the physical connectivity of all regions of our planet with each other, which is expressed in a change in the logic of the topology, today planted and controlled by man. Secondly, the presence of this huge and unbroken array is evidenced by the biological component of the world economy, which we have also transformed to suit our needs, thereby redrawing the natural course of affairs in this area and turning it into a global one. Third, the same is true of the cultural domain of our life, which at some point became universal, which again was achieved for the sake of our goals and interests, as a result of which we are all now members of a single interconnected association. It is of interest to both specialists and a wide audience and will be useful for us to understand both ourselves and the reality that we have constructed.
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3

Baron, Gerard Sta Maria. Graphics hardware accelerated time-domain modeling of wireless channel geometries. 2006.

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4

Baron, Gerard Sta Maria. Graphics hardware accelerated time-domain modeling of wireless channel geometries. 2006, 2006.

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5

Time Domain Simulation of MFSK Communications System Performance in the Presence of Wideband Noise and Co-Channel Interference. Storming Media, 1998.

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6

Oakes, Lisa M., and David H. Rakison. Developmental Cascades. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780195391893.001.0001.

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Children take their first steps, produce their first words, and become able to solve many new problems seemingly overnight. Yet, each change reflects many other previous developments that occurred in the whole child across a range of domains, and each change, in turn, will provide opportunities for future development. This book proposes that all change can be explained in terms of developmental cascades such that events that occur at one point in development set the stage, or cause a ripple effect, for the emergence or development of different abilities, functions, or behaviors at another point in time. The authors argue that these developmental cascades are influenced by different kinds of constraints that do not have a single foundation: They may originate from the structure of the child’s nervous system and body, the physical or social environment, or knowledge and experience. These constraints occur at multiple levels of processing and change over time, and both contribute to developmental cascades and are the product of them. The book presents an overview of this developmental cascade perspective as a general framework for understanding change throughout the lifespan, although it is applied primarily to cognitive development in infancy. The book also addresses how a cascade approach obviates the dichotomy between domain-general and domain-specific mechanisms. The framework is applied in detail to three domains within infant cognitive development—namely, looking behavior, object representations, and concepts for animacy—as well as two domains unrelated to infant cognition (gender and attachment).
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Farfan, Penny. Epilogue. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190679699.003.0007.

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A recurrent figure throughout this book, Oscar Wilde both exemplified and generated a connection between queerness and modernism that was enacted in and through performance. In this brief epilogue, Wilde’s contention that “what is termed Sin is an essential element of progress” serves to encapsulate how, as illustrated in the preceding chapters, queer modernist performance was a subversive yet insufficiently recognized aspect of modernism. Queer modernist performance thus clarifies that modernism, as Susan Stanford Friedman has argued, was a domain within modernity that effected change while at the same time intersecting with other domains of change, in this instance gender and sexuality.
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Tabibian-Mizrahi, Michal. Precarious Employment in the Public Sector. Edited by Michael Shalev. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198793021.003.0009.

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This case study of precarious employment in public hospitals shows that the adoption of neoliberal practices was a gradual process whose roots can be traced to earlier decades. Innovative and even revolutionary changes in civil service hiring practices emerged in the early 1960s, gathering momentum in the subsequent decade. In this domain, at least, neoliberal practices preceded the neoliberal ideological shift, and helped pave the way for the latter’s assimilation. At the same time, being conferred with significance and legitimacy assisted the further growth of precarity in the public sector. This dialectic of ideas and organizational practices constituted an important mechanism entrenching neoliberal modes of employment within the state.
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Sharma, Devyani. World Englishes and Sociolinguistic Theory. Edited by Markku Filppula, Juhani Klemola, and Devyani Sharma. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199777716.013.021.

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This chapter reviews the relationship between sociolinguistic theory and the empirical domain of World Englishes. Despite considerable potential for mutual exchange, sociolinguistic theory has not been the primary analytic model for World Englishes. Using examples from multilingual cultures around the world, the chapter illustrates how postcolonial English contexts can test the validity of classic tenets of sociolinguistic theory. These include principles pertaining to class, gender, style, age, network, peer effects, apparent time, and identity, all of which were initially based on observations in monolingual urban Western contexts. The discussion then turns to the importance of such testable theoretical claims for deeper understandings of the social dynamics of variation and change in World Englishes.
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10

Knight, Andrew P. Innovations in unobtrusive methods. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198796978.003.0004.

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Andrew P. Knight explores developments in unobtrusive research methods using unconventional sources of data from computer-based systems and tools. These generate novel measures of behaviour based on the digital trace data that we all generate, online access to public and personal archives, wearable sensors, and the automatic coding of text, and audio and video recordings. Smartphones and wristbands are just two of the growing range of connected devices that are capable of capturing and sharing multimedia information in real-time. Devices such as these offer new ways in which researchers can gather data at low cost, avoiding reactance effects, allowing the study of how phenomena change over time, and expanding the scale of research, given the wide dissemination of the technology. Before adopting these methods, researchers need to consider whether they have the expertise, and the ethical issues raised by using information (which may be in the public domain) without informed consent.
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Частини книг з теми "TIME-DOMAIN CHANNEL"

1

Benesty, Jacob, and Jingdong Chen. "Single-Channel Noise Reduction with a Filtering Vector." In Optimal Time-Domain Noise Reduction Filters, 3–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19601-0_2.

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Benesty, Jacob, and Jingdong Chen. "Single-Channel Noise Reduction with a Rectangular Filtering Matrix." In Optimal Time-Domain Noise Reduction Filters, 23–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19601-0_3.

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3

Thiergart, Oliver, and Emanuël Habets. "Multi-Channel Sound Acquisition Using a Multi-Wave Sound Field Model." In Parametric Time-Frequency Domain Spatial Audio, 161–99. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119252634.ch7.

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4

Benesty, Jacob, and Jingdong Chen. "Single-Channel Noise Reduction in the Time Domain." In SpringerBriefs in Electrical and Computer Engineering, 15–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12955-6_3.

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Benesty, Jacob, and Israel Cohen. "Single-Channel Speech Enhancement in the Time Domain." In SpringerBriefs in Electrical and Computer Engineering, 15–35. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67020-1_3.

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Benesty, Jacob, Tomas Gänsler, and Peter Eneroth. "Multi-Channel Sound, Acoustic Echo Cancellation, and Multi-Channel Time-Domain Adaptive Filtering." In Acoustic Signal Processing for Telecommunication, 101–20. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4419-8644-3_6.

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7

Le Saux, B., M. Hélard, and R. Legouable. "Robust time domain channel estimation for MIMO-OFDMA Downlink System." In Multi-Carrier Spread Spectrum 2007, 357–66. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6129-5_36.

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8

Mata, Tanairat, Pisit Boonsrimuang, Kazuo Mori, and Hideo Kobayashi. "Proposal of Time Domain Channel Estimation Method for MIMO-OFDM Systems." In Wireless and Satellite Systems, 215–28. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25479-1_16.

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Zhang, Yanzhong. "On Channel Estimation in DTMB Standard Using Time Domain PN Sequences." In Footprints in Cambridge and Aviation Industries of China, 161–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3176-4_18.

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Steiner, Bernd. "Time Domain Uplink Channel Estimation in Multicarrier-CDMA Mobile Radio System Concepts." In Multi-Carrier Spread-Spectrum, 153–60. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6231-3_18.

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Тези доповідей конференцій з теми "TIME-DOMAIN CHANNEL"

1

Vychodil, Josef, Aniruddha Chandra, Tomas Mikulasek, Ales Prokes, and Vojtech Derbek. "UWB time domain channel sounder." In 2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA. IEEE, 2015. http://dx.doi.org/10.1109/radioelek.2015.7129028.

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Ivanov, Ilya. "Time domain equalizer with minimax channel estimation." In 2016 XV International Symposium Problems of Redundancy in Information and Control Systems (REDUNDANCY). IEEE, 2016. http://dx.doi.org/10.1109/red.2016.7779330.

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3

Tasadduq, Bushra, Aisha Haroon, Hira Imtiaz, and Adeel Razi. "Comparison of time domain and frequency domain equalization for HSDPA channel." In 2010 International Symposium on Computer, Communication, Control and Automation (3CA 2010). IEEE, 2010. http://dx.doi.org/10.1109/3ca.2010.5533811.

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4

Jia, Min, Zhen-Yong Wang, and Xue-Mai Gu. "Joint Time Domain Channel and Channel Length Estimation for OFDM System." In 2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing. IEEE, 2007. http://dx.doi.org/10.1109/pacrim.2007.4313309.

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5

Ye, Xiaoning, and Weifeng Shu. "Fast channel performance evaluation using time domain metrics." In 2013 IEEE International Symposium on Electromagnetic Compatibility - EMC 2013. IEEE, 2013. http://dx.doi.org/10.1109/isemc.2013.6670531.

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6

Brandt, Rasmus, and Mats Bengtsson. "Wideband MIMO channel diagonalization in the time domain." In 2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2011). IEEE, 2011. http://dx.doi.org/10.1109/pimrc.2011.6139853.

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7

Möller, M., H. Wabnitz, A. Kummrow, B. Wassermann, R. Macdonald, H. Rinneberg, R. Erdmann, and K. Lauritsen. "A multi-channel scanning optical time domain mammograph." In Biomedical Topical Meeting. Washington, D.C.: OSA, 2004. http://dx.doi.org/10.1364/bio.2004.thf40.

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Li, Shufeng, Hongda Wu, and Libiao Jin. "Channel estimation in time domain using complementary sequence." In 2017 3rd IEEE International Conference on Control Science and Systems Engineering (ICCSSE). IEEE, 2017. http://dx.doi.org/10.1109/ccsse.2017.8087978.

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Tsujimura, Kazuhiro, Kenta Umebayashi, Joonas Kokkoniemi, and Janne Lehtomaki. "Time Domain Channel Model for the THz Band." In 2019 16th International Symposium on Wireless Communication Systems (ISWCS). IEEE, 2019. http://dx.doi.org/10.1109/iswcs.2019.8877200.

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Ntontin, Konstantinos, Nikolaos Skentos, and Fotis Lazarakis. "Time- vs. Frequency-Domain Channel Estimation in MIMO LOS Frequency-Selective Channels." In 2020 IEEE International Symposium on Signal Processing and Information Technology (ISSPIT). IEEE, 2020. http://dx.doi.org/10.1109/isspit51521.2020.9408923.

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Звіти організацій з теми "TIME-DOMAIN CHANNEL"

1

Brainard, James Robert, Vincent Carroll Tidwell, Amy K. Coplen, Douglas Scott Ruby, Jason R. Coombs, Jerome L. Wright, and Jesse Daniel Roberts. Monitoring stream stage, channel profile, and aqueous conductivity with time domain reflectometry (TDR). Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/919193.

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2

Russell, H. A. J., and S. K. Frey. Canada One Water: integrated groundwater-surface-water-climate modelling for climate change adaptation. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329092.

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Canada 1 Water is a 3-year governmental multi-department-private-sector-academic collaboration to model the groundwater-surface-water of Canada coupled with historic climate and climate scenario input. To address this challenge continental Canada has been allocated to one of 6 large watershed basins of approximately two million km2. The model domains are based on natural watershed boundaries and include approximately 1 million km2 of the United States. In year one (2020-2021) data assembly and validation of some 20 datasets (layers) is the focus of work along with conceptual model development. To support analysis of the entire water balance the modelling framework consists of three distinct components and modelling software. Land Surface modelling with the Community Land Model will support information needed for both the regional climate modelling using the Weather Research &amp; Forecasting model (WRF), and input to HydroGeoSphere for groundwater-surface-water modelling. The inclusion of the transboundary watersheds will provide a first time assessment of water resources in this critical international domain. Modelling is also being integrated with Remote Sensing datasets, notably the Gravity Recovery and Climate Experiment (GRACE). GRACE supports regional scale watershed analysis of total water flux. GRACE along with terrestrial time-series data will serve provide validation datasets for model results to ensure that the final project outputs are representative and reliable. The project has an active engagement and collaborative effort underway to try and maximize the long-term benefit of the framework. Much of the supporting model datasets will be published under open access licence to support broad usage and integration.
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3

Bano, Masooda, and Zeena Oberoi. Embedding Innovation in State Systems: Lessons from Pratham in India. Research on Improving Systems of Education (RISE), December 2020. http://dx.doi.org/10.35489/bsg-rise-wp_2020/058.

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The learning crisis in many developing countries has led to searches for innovative teaching models. Adoption of innovation, however, disrupts routine and breaks institutional inertia, requiring government employees to change their way of working. Introducing and embedding innovative methods for improving learning outcomes within state institutions is thus a major challenge. For NGO-led innovation to have largescale impact, we need to understand: (1) what factors facilitate its adoption by senior bureaucracy and political elites; and (2) how to incentivise district-level field staff and school principals and teachers, who have to change their ways of working, to implement the innovation? This paper presents an ethnographic study of Pratham, one of the most influential NGOs in the domain of education in India today, which has attracted growing attention for introducing an innovative teaching methodology— Teaching at the Right Level (TaRL) – with evidence of improved learning outcomes among primary-school students and adoption by a number of states in India. The case study suggests that while a combination of factors, including evidence of success, ease of method, the presence of a committed bureaucrat, and political opportunity are key to state adoption of an innovation, exposure to ground realities, hand holding and confidence building, informal interactions, provision of new teaching resources, and using existing lines of communication are core to ensuring the co-operation of those responsible for actual implementation. The Pratham case, however, also confirms existing concerns that even when NGO-led innovations are successfully implemented at a large scale, their replication across the state and their sustainability remain a challenge. Embedding good practice takes time; the political commitment leading to adoption of an innovation is often, however, tied to an immediate political opportunity being exploited by the political elites. Thus, when political opportunity rather than a genuine political will creates space for adoption of an innovation, state support for that innovation fades away before the new ways of working can replace the old habits. In contexts where states lack political will to improve learning outcomes, NGOs can only hope to make systematic change in state systems if, as in the case of Pratham, they operate as semi-social movements with large cadres of volunteers. The network of volunteers enables them to slow down and pick up again in response to changing political contexts, instead of quitting when state actors withdraw. Involving the community itself does not automatically lead to greater political accountability. Time-bound donor-funded NGO projects aiming to introduce innovation, however large in scale, simply cannot succeed in bringing about systematic change, because embedding change in state institutions lacking political will requires years of sustained engagement.
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4

Sela, Shlomo, and Michael McClelland. Investigation of a new mechanism of desiccation-stress tolerance in Salmonella. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7598155.bard.

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Low-moisture foods (LMF) are increasingly involved in foodborne illness. While bacteria cannot grow in LMF due to the low water content, pathogens such as Salmonella can still survive in dry foods and pose health risks to consumer. We recently found that Salmonella secretes a proteinaceous compound during desiccation, which we identified as OsmY, an osmotic stress response protein of 177 amino acids. To elucidate the role of OsmY in conferring tolerance against desiccation and other stresses in Salmonella entericaserovarTyphimurium (STm), our specific objectives were: (1) Characterize the involvement of OsmY in desiccation tolerance; (2) Perform structure-function analysis of OsmY; (3) Study OsmY expression under various growth- and environmental conditions of relevance to agriculture; (4) Examine the involvement of OsmY in response to other stresses of relevance to agriculture; and (5) Elucidate regulatory pathways involved in controlling osmY expression. We demonstrated that an osmY-mutant strain is impaired in both desiccation tolerance (DT) and in long-term persistence during cold storage (LTP). Genetic complementation and addition of a recombinantOsmY (rOsmY) restored the mutant survival back to that of the wild type (wt). To analyze the function of specific domains we have generated a recombinantOsmY (rOsmY) protein. A dose-response DT study showed that rOsmY has the highest protection at a concentration of 0.5 nM. This effect was protein- specific as a comparable amount of bovine serum albumin, an unrelated protein, had a three-time lower protection level. Further characterization of OsmY revealed that the protein has a surfactant activity and is involved in swarming motility. OsmY was shown to facilitate biofilm formation during dehydration but not during bacterial growth under optimal growth conditions. This finding suggests that expression and secretion of OsmY under stress conditions was potentially associated with facilitating biofilm production. OsmY contains two conserved BON domains. To better understand the role of the BON sites in OsmY-mediated dehydration tolerance, we have generated two additional rOsmY constructs, lacking either BON1 or BON2 sites. BON1-minus (but not BON2) protein has decreased dehydration tolerance compared to intact rOsmY, suggesting that BON1 is required for maximal OsmY-mediated activity. Addition of BON1-peptide at concentration below 0.4 µM did not affect STm survival. Interestingly, a toxic effect of BON1 peptide was observed in concentration as low as 0.4 µM. Higher concentrations resulted in complete abrogation of the rOsmY effect, supporting the notion that BON-mediated interaction is essential for rOsmY activity. We performed extensive analysis of RNA expression of STm undergoing desiccation after exponential and stationary growth, identifying all categories of genes that are differentially expressed during this process. We also performed massively in-parallel screening of all genes in which mutation caused changes in fitness during drying, identifying over 400 such genes, which are now undergoing confirmation. As expected OsmY is one of these genes. In conclusion, this is the first study to identify that OsmY protein secreted during dehydration contributes to desiccation tolerance in Salmonella by facilitating dehydration- mediated biofilm formation. Expression of OsmY also enhances swarming motility, apparently through its surfactant activity. The BON1 domain is required for full OsmY activity, demonstrating a potential intervention to reduce pathogen survival in food processing. Expression and fitness screens have begun to elucidate the processes of desiccation, with the potential to uncover additional specific targets for efforts to mitigate pathogen survival in desiccation.
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