Thematische Bibliographien / Shift correction

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Auswahl der wissenschaftlichen Literatur zum Thema „Shift correction“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Shift correction"

Delhaye, Robert, Volker Rath, Alan G. Jones, Mark R. Muller und Derek Reay. „Correcting for static shift of magnetotelluric data with airborne electromagnetic measurements: a case study from Rathlin Basin, Northern Ireland“. Solid Earth 8, Nr. 3 (22.05.2017): 637–60. http://dx.doi.org/10.5194/se-8-637-2017.

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Abstract. Galvanic distortions of magnetotelluric (MT) data, such as the static-shift effect, are a known problem that can lead to incorrect estimation of resistivities and erroneous modelling of geometries with resulting misinterpretation of subsurface electrical resistivity structure. A wide variety of approaches have been proposed to account for these galvanic distortions, some depending on the target area, with varying degrees of success. The natural laboratory for our study is a hydraulically permeable volume of conductive sediment at depth, the internal resistivity structure of which can be used to estimate reservoir viability for geothermal purposes; however, static-shift correction is required in order to ensure robust and precise modelling accuracy.We present here a possible method to employ frequency–domain electromagnetic data in order to correct static-shift effects, illustrated by a case study from Northern Ireland. In our survey area, airborne frequency domain electromagnetic (FDEM) data are regionally available with high spatial density. The spatial distributions of the derived static-shift corrections are analysed and applied to the uncorrected MT data prior to inversion. Two comparative inversion models are derived, one with and one without static-shift corrections, with instructive results. As expected from the one-dimensional analogy of static-shift correction, at shallow model depths, where the structure is controlled by a single local MT site, the correction of static-shift effects leads to vertical scaling of resistivity–thickness products in the model, with the corrected model showing improved correlation to existing borehole wireline resistivity data. In turn, as these vertical scalings are effectively independent of adjacent sites, lateral resistivity distributions are also affected, with up to half a decade of resistivity variation between the models estimated at depths down to 2000 m. Simple estimation of differences in bulk porosity, derived using Archie's Law, between the two models reinforces our conclusion that the suborder of magnitude resistivity contrasts induced by the correction of static shifts correspond to similar contrasts in estimated porosities, and hence, for purposes of reservoir investigation or similar cases requiring accurate absolute resistivity estimates, galvanic distortion correction, especially static-shift correction, is essential.

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Abdullah, Hikmat N., Thamir R. Saeed und Asaad H. Sahar. „Efficient error correcting scheme for chaos shift keying signals“. International Journal of Electrical and Computer Engineering (IJECE) 9, Nr. 5 (01.10.2019): 3550. http://dx.doi.org/10.11591/ijece.v9i5.pp3550-3557.

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An effective error-correction scheme based on normalized correlation for a non coherent chaos communication system with no redundancy bits is proposed in this paper. A modified logistic map is used in the proposed scheme for generating two sequences, one for every data bit value, in a manner that the initial value of the next chaotic sequence is set by the second value of the present chaotic sequence of the similar symbol. This arrangement, thus, has the creation of successive chaotic sequences with identical chaotic dynamics for error correction purpose. The detection symbol is performed prior to correction, on the basis of the suboptimal receiver which anchors on the computation of the shortest distance existing between the received sequence and the modified logistic map’s chaotic trajectory. The results of the simulation reveal noticeable Eb/No improvement by the proposed scheme over the prior to the error- correcting scheme with the improvement increasing whenever there is increase in the number of sequence N. Prior to the error-correcting scheme when N=8, a gain of 1.3 dB is accomplished in Eb/No at 10-3 bit error probability. On the basis of normalized correlation, the most efficient point in our proposed error correction scheme is the absence of any redundant bits needed with minimum delay procedure, in contrast to earlier method that was based on suboptimal method detection and correction. Such performance would render the scheme good candidate for applications requiring high rates of data transmission.

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Piotrowski, Tomasz, Krzysztof Kaczmarek, Agata Jodda, Adam Ryczkowski, Tomasz Bajon, George Rodrigues und Slav Yartsev. „Image guidance procedures in radiotherapy for prostate cancer and the influence of body mass index“. Journal of Radiotherapy in Practice 13, Nr. 4 (23.04.2014): 410–17. http://dx.doi.org/10.1017/s1460396914000193.

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AbstractPurposeTo investigate possible optimisation of the image guidance procedure for the prostate cancer patients with respect to imaging frequency and patient body mass index (BMI).MethodsThe 6,085 setup correction shifts and BMI for 216 prostate cancer patients treated on tomotherapy units in two centres were analysed. Margins needed to account for inter-fraction target motion with daily only automatic correction and with automatic and manual corrections during one, three or five first fractions as a reference for further treatment without imaging were calculated.ResultsThe planning target volume margin calculated for the daily automatic correction only scheme was significantly lower than the margins calculated for the image guidance limited to a few initial fractions. Manual corrections after automatic fusion were more important for patients with higher BMI. On average, the patients with normal BMI had manual correction shift of 0·7 mm in anterioposterior direction, while overweight and obese patients required, correspondingly, the shifts of 1·3 and 1·4 mm.ConclusionOverweight and obese patients require daily imaging with time saving available by performing automatic kV/MV computed tomography registration only. The patients with normal BMI may be treated with imaging guidance during a few initial treatment fractions.

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Reichenbach, Alexandra, Angela Costello, Peter Zatka-Haas und Jörn Diedrichsen. „Mechanisms of responsibility assignment during redundant reaching movements“. Journal of Neurophysiology 109, Nr. 8 (15.04.2013): 2021–28. http://dx.doi.org/10.1152/jn.01052.2012.

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When the two hands act together to achieve a goal, the redundancy of the system makes it necessary to distribute the responsibility for error corrections across the two hands. In an experiment in which participants control a single cursor with the movements of both hands, we show that right-handed individuals correct for movement errors more with their nondominant left hand than with their right hand, even though the dominant right hand corrects the same errors more quickly and efficiently when each hand acts in isolation. By measuring the responses to rapid cursor and target displacements using force channels, we demonstrate that this shift is due to a modulation of the feedback gains of each hand rather than to a shift in the onset of the corrective response. We also show that the shift toward left-hand corrections is more pronounced for errors that lead to adaptation (cursor displacements) than for perturbations that do not (target displacements). This finding provides some support for the idea that the motor system assigns the correction to the most likely source of the error to induce learning and to optimize future performance. Finally, we find that the relative strength of the feedback corrections in the redundant task correlates positively with those found for the nonredundant tasks. Thus the process of responsibility assignment modulates the processes that normally determine the gains of feedback correction rather than completely overwriting them.

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Reinertsen, Ingerid, Frank Lindseth, Christian Askeland, Daniel Høyer Iversen und Geirmund Unsgård. „Intra-operative correction of brain-shift“. Acta Neurochirurgica 156, Nr. 7 (03.04.2014): 1301–10. http://dx.doi.org/10.1007/s00701-014-2052-6.

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Admon, Uri. „Specimen shift correction in tilting experiments“. Ultramicroscopy 21, Nr. 3 (Januar 1987): 297. http://dx.doi.org/10.1016/0304-3991(87)90156-2.

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Jalilov, Ya R., V. Q. Verdiyev und T. Y. Jalilov. „Application of Cross-Section Corrective («Translation») Forces at Surgical Treatment for Scoliosis“. N.N. Priorov Journal of Traumatology and Orthopedics 19, Nr. 3 (15.09.2012): 14–19. http://dx.doi.org/10.17816/vto20120314-19.

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Surgical treatment results for 53 patients with III—IV stage of scoliosis are presented. In all patients original endocorrector has been applied. Endocorrector is based on the application of cross-section corrective («translation effect») forces that enable to shift the vertebrae of the main scoliotic arch to the median line of the trunk. Endocorrector was the most effective in curvature arch under 75° and provided 35—45° correction. Mathematic modeling of a situation «endocor- rector—curved spine» was performed as well as the pattern of forces created by endocorrector and participated in the scoliotic deformity correction was studied. Surgical intervention enabled to achieve stable fixation of the spine with its sagittal contours preservation. At long-term follow up (1—6 years) loss of correction did not exceed 8—10°. In scoliosis with arch over 75° step-by- step corrections were performed and loss of correction could make up 15°.

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Sternberg, Ben K., James C. Washburne und Louise Pellerin. „Correction for the static shift in magnetotellurics using transient electromagnetic soundings“. GEOPHYSICS 53, Nr. 11 (November 1988): 1459–68. http://dx.doi.org/10.1190/1.1442426.

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Shallow inhomogeneities can lead to severe problems in the interpretation of magnetotelluric (MT) data by shifting the MT apparent resistivity sounding curve by a scale factor, which is independent of frequency on the standard log‐apparent‐resistivity versus log‐frequency display. The amount of parallel shift, commonly referred to as the MT static shift, can not be determined directly from conventionally recorded MT data at a single site. One method for measuring the static shift is a controlled‐source measurement of the magnetic field. Unlike the electric field, the magnetic field is relatively unaffected by surface inhomogeneities. The controlled‐source sounding (which may be a relatively shallow sounding made with lightweight equipment) can be combined with a deep MT sounding to obtain a complete, undistorted model of the earth. Inversions of the static shift‐corrected MT data provide a much closer match to well‐log resistivities than do inversions of the uncorrected data. The particular controlled‐source magnetic‐field sounding which we used was a central‐induction Transient ElectroMagnetic (TEM) sounding. Correction for the static shift in the MT data was made by jointly inverting the MT data and the TEM data. A parameter which allowed vertical shifts in the MT apparent resistivity curves was included in the computer inversion to account for static shifts. A simple graphical comparison between the MT apparent resistivities and the TEM apparent resistivities produced essentially the same estimate of the static shift (within 0.1 decade) as the joint computer inversion. Central‐induction TEM measurements were made adjacent to over 100 MT sites in central Oregon. The complete data base of over 100 sites showed an average static shift between 0 and 0.2 decade. However, in the rougher topography and more complex structure of the Cascade Mountain Range, the majority of the sites had static shifts of the order of 0.3 to 0.4 decade. The static shifts in this area are probably due to a combination of topography and surficial inhomogeneities. The TEM apparent resistivity (which is used to estimate the unshifted MT apparent resistivity) does not necessarily agree with either the transverse electric (TE) or the transverse magnetic (TM) MT polarization. TEM apparent resistivity may occur between the two, or may agree with one of the two polarizations, or may lie outside the MT polarizations.

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Stieglitz, Lennart Henning, Christian Ayer, Kaspar Schindler, Markus Florian Oertel, Roland Wiest und Claudio Pollo. „Improved Localization of Implanted Subdural Electrode Contacts on Magnetic Resonance Imaging With an Elastic Image Fusion Algorithm in an Invasive Electroencephalography Recording“. Operative Neurosurgery 10, Nr. 4 (23.06.2014): 506–13. http://dx.doi.org/10.1227/neu.0000000000000473.

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Abstract BACKGROUND: Accurate projection of implanted subdural electrode contacts in presurgical evaluation of pharmacoresistant epilepsy cases by invasive electroencephalography is highly relevant. Linear fusion of computed tomography and magnetic resonance images may display the contacts in the wrong position as a result of brain shift effects. OBJECTIVE: A retrospective study in 5 patients with pharmacoresistant epilepsy was performed to evaluate whether an elastic image fusion algorithm can provide a more accurate projection of the electrode contacts on the preimplantation magnetic resonance images compared with linear fusion. METHODS: An automated elastic image fusion algorithm (AEF), a guided elastic image fusion algorithm (GEF), and a standard linear fusion algorithm were used on preoperative magnetic resonance images and postimplantation computed tomography scans. Vertical correction of virtual contact positions, total virtual contact shift, corrections of midline shift, and brain shifts caused by pneumocephalus were measured. RESULTS: Both AEF and GEF worked well with all 5 cases. An average midline shift of 1.7 mm (SD, 1.25 mm) was corrected to 0.4 mm (SD, 0.8 mm) after AEF and to 0.0 mm (SD, 0 mm) after GEF. Median virtual distances between contacts and cortical surface were corrected by a significant amount, from 2.3 mm after linear fusion algorithm to 0.0 mm after AEF and GEF (P < .001). Mean total relative corrections of 3.1 mm (SD, 1.85 mm) after AEF and 3.0 mm (SD, 1.77 mm) after GEF were achieved. The tested version of GEF did not achieve a satisfying virtual correction of pneumocephalus. CONCLUSION: The technique provided a clear improvement in fusion of preimplantation and postimplantation scans, although the accuracy is difficult to evaluate.

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Liu, Yong Gang, Da Tong Qin, Zhen Zhen Lei und Rui Ding. „Intelligent Correction of Shift Schedule for Dual Clutch Transmissions Based on Different Driving Conditions“. Applied Mechanics and Materials 121-126 (Oktober 2011): 3982–87. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3982.

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This paper focuses on intelligent correction of shift schedule for dual clutch transmissions based on different driving conditions. The problem of standard shift schedule has been presented, and the strategy has also been proposed to avoid shift hunting and unexpected shift. The driver’s intention and driving environment have been unified recognized as different driving conditions. A fuzzy logic technology has been used in driver’s attention recognition based on the throttle opening and its derivative. The standard shift schedule has been intelligently corrected at different driving condition separately. An algorithm based on correction coefficient of throttle opening and vehicle speed is proposed for intelligent correction. The corrected shift schedule can be directly used in real time shift control with suitable correction coefficient.

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Dissertationen zum Thema "Shift correction"

Reinertsen, Ingerid R. „Vessel driven correction of brain-shift“. Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111865.

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The displacement and deformation of brain tissue is a major source of error in image-guided neurosurgery systems. This thesis presents the design, implementation and validation of an image registration algortithm to detect and correct brain-shift using pre-operative MR images and intraoperative Doppler ultrasound data. The registration algorithm uses segmented vessels from both modalities, and estimates the displacement using a modified version of the iterative closest point (ICP) algorithm. The least trimmed squares (LTS) was used to reduce the number of outliers in the point matching procedure. The selected points were first used to estimate a linear transformation between the two data-sets, and then used to drive a thin-plate spline transform to achieve non-linear registration.
A deformable brain phantom was designed, constructed and characterized in order to serve as a gold standard in the validation of the registration algorithm. The reproducibility of the elastic deformation of the phantom was evaluated using MR imaging and surface measurements. The experiments showed that the phantom was well suited for MR and ultrasound imaging (B-mode and Doppler) with sub-millimeter reproducibility for the deformations.
Validation of the registration technique was then completed in three parts. First, the technique was tested and validated using realistic simulations where the results were compared to the known deformation. The registration technique recovered 75% of the deformation in the region of interest accounting for deformations as large as 20 mm.
Second, a phantom study was performed where both MR and ultrasound images of the phantom were obtained for three different deformations. The registration results based on MR data were used as a gold standard to evaluate the performance of the ultrasound based registration. On average, deformations of 7.5 mm magnitude were corrected to within 1.6 mm for the ultrasound based registration and 1.07 mm for the MR based registration. Finally, the registration algorithm was validated using five retrospective clinical data-sets. Because the true displacement remained unknown, the method was validated using homologous landmarks identified in the original data, the exclusion of selected vessels, and finally manual segmentation of non-vascular structures in anatomical data. The tracking of homologous landmarks show that the registration algorithm was able to correct the deformation to within 1.24 mm, and the validation using excluded vessels and anatomical structures show an accuracy close to 1 mm. Pre-processing of the data can be completed in 30 seconds per dataset, and registrations can be performed in less than 30 seconds. This makes the technique well suited for intra-operative use.

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Liu, Wenjie. „Estimation and bias correction of the magnitude of an abrupt level shift“. Thesis, Linköpings universitet, Statistik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84618.

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Consider a time series model which is stationary apart from a single shift in mean. If the time of a level shift is known, the least squares estimator of the magnitude of this level shift is a minimum variance unbiased estimator. If the time is unknown, however, this estimator is biased. Here, we first carry out extensive simulation studies to determine the relationship between the bias and three parameters of our time series model: the true magnitude of the level shift, the true time point and the autocorrelation of adjacent observations. Thereafter, we use two generalized additive models to generalize the simulation results. Finally, we examine to what extent the bias can be reduced by multiplying the least squares estimator with a shrinkage factor. Our results showed that the bias of the estimated magnitude of the level shift can be reduced when the level shift does not occur close to the beginning or end of the time series. However, it was not possible to simultaneously reduce the bias for all possible time points and magnitudes of the level shift.

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Hopkins, Kevin S. „Error detection and correction for a multiple frequency quaternary phase shift keyed signal“. Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27027.

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Wong, Dominic P. C. „Nonredundant error correction of π/4-shift DQPSK systems for mobile and cellular system applications“. Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30120.

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The application of the nonredundant error correction (NEC) technique to the new North American and Japanese Digital Cellular modulation standard, the π/4-shift DQPSK modulation format, is proposed, analyzed and evaluated. Due to the nature of the mobile cellular communication channel, it is assumed that the π/4-shift DQPSK system is operated in a combined additive white Gaussian noise (AWGN) and cochannel interference (CCI) environment as well as in a frequency-nonselective fading environment. The NEC techniques can be accommodated to the π/4-shift DQPSK by a modification of the NEC receivers for the DQPSK following which the performance of the NEC receivers with single-, double- and triple-error correction capability are theoretically analyzed and evaluated. The most elaborate system analyzed is the triple-error NEC receiver which employs four differential detectors with delay elements of one up to four symbol duration long and which requires the computation of 12 syndromes for the correction of error symbols. For the CCI, the general model which includes M statistical independent interferers also employing the π/4-shift DQPSK modulation format is adopted. The theoretical symbol error rate (SER) versus carrier-to-noise (C/N) ratio have been obtained having M and the carrier-to-interference (C/I) ratio as parameters. These performance evaluation results indicate significant performance improvements over conventional differentially detected π/4-shift DQPSK systems without requiring any bandwidth expansion. For example, at a SER = 10ˉ⁴ and for C/I = 14 dB and M = 6, gains of more than 7 dB have been obtained. Compared with a coherent π/4-shift QPSK system operated in the same environment, this triple error correcting NEC is inferior by only 1.5 dB. Some of these theoretical results have also been verified by computer simulation. The gains offered by the NEC receivers have been found to increase as C/I decreases and/or M increases. In addition to the performance improvements, significant error floor reductions (of at least one order of magnitude) have been observed. For the fading channel, the theoretical error rate equation for the single-error correcting NEC receiver is newly derived. Since numerical evaluation of the derived equation is extremely time consuming, computer simulations were used to obtain the performance evaluation result of π/4-shift DQPSK system employing single- and double-error correcting NEC receivers. In general, the improvement are not as high as that in the CCI environment. For example, at a BER = IOˉ² and for a Rician fading channel with the K-factor of 1 dB with BDT = 6.29, a performance gain of 6 dB is achieved. The gains offered by the NEC receivers increases as the K-factor decreases and/or when the BDT is large. Since the NEC technique does not require any bandwidth or signal constellation expansion as do other coding schemes, it is a powerful and attractive technique to increase the capacity of digital communication systems operated in CCI controlled (frequency reuse) environment, such as the new all digital North American and Japanese mobile/cellular network. The significant improvement of the NEC receivers in a very fast fading environment suggests the NEC receivers can also be applied to communication applications in which the speed of the mobile unit is very high, for example, in aeronautical communication systems. Finally, it is noteworthy that the results obtained in this thesis for the π/4-shift DQPSK systems are directly applicable to the DQPSK systems in a linear channel.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate

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Meißner, Mirko [Verfasser], und Jürgen [Akademischer Betreuer] Hennig. „Chemical Shift Artefact Correction in 19F Magnetic Resonance Imaging = Korrektur des Artefakts der Chemischen Verschiebung in der 19F Magnetresonanzbildgebung“. Freiburg : Universität, 2014. http://d-nb.info/1123478813/34.

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Chen, Xi. „Automatic ¹³C Chemical Shift Reference Correction of Protein NMR Spectral Data Using Data Mining and Bayesian Statistical Modeling“. UKnowledge, 2019. https://uknowledge.uky.edu/biochem_etds/40.

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Nuclear magnetic resonance (NMR) is a highly versatile analytical technique for studying molecular configuration, conformation, and dynamics, especially of biomacromolecules such as proteins. However, due to the intrinsic properties of NMR experiments, results from the NMR instruments require a refencing step before the down-the-line analysis. Poor chemical shift referencing, especially for 13C in protein Nuclear Magnetic Resonance (NMR) experiments, fundamentally limits and even prevents effective study of biomacromolecules via NMR. There is no available method that can rereference carbon chemical shifts from protein NMR without secondary experimental information such as structure or resonance assignment. To solve this problem, we constructed a Bayesian probabilistic framework that circumvents the limitations of previous reference correction methods that required protein resonance assignment and/or three-dimensional protein structure. Our algorithm named Bayesian Model Optimized Reference Correction (BaMORC) can detect and correct 13C chemical shift referencing errors before the protein resonance assignment step of analysis and without a three-dimensional structure. By combining the BaMORC methodology with a new intra-peaklist grouping algorithm, we created a combined method called Unassigned BaMORC that utilizes only unassigned experimental peak lists and the amino acid sequence. Unassigned BaMORC kept all experimental three-dimensional HN(CO)CACB-type peak lists tested within ± 0.4 ppm of the correct 13C reference value. On a much larger unassigned chemical shift test set, the base method kept 13C chemical shift referencing errors to within ± 0.45 ppm at a 90% confidence interval. With chemical shift assignments, Assigned BaMORC can detect and correct 13C chemical shift referencing errors to within ± 0.22 at a 90% confidence interval. Therefore, Unassigned BaMORC can correct 13C chemical shift referencing errors when it will have the most impact, right before protein resonance assignment and other downstream analyses are started. After assignment, chemical shift reference correction can be further refined with Assigned BaMORC. To further support a broader usage of these new methods, we also created a software package with web-based interface for the NMR community. This software will allow non-NMR experts to detect and correct 13C referencing errors at critical early data analysis steps, lowering the bar of NMR expertise required for effective protein NMR analysis.

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Lin, Jinsong, und Kamilo Feher. „BANDWIDTH EFFICIENCY AND BER PERFORMANCE OF ENHANCED AND FEC CODED FQPSK“. International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/607727.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California
Bit error rate (BER) and bandwidth efficiency of several variations of enhanced Feher patented quadrature phase shift keying (FQPSK) [1] are described. An enhanced FQPSK increases the channel packing density of that of the IRIG 106-00 standardized FQPSK-B by approximately 50% in adjacent channel interference (ACI) environment. As the bandwidth efficiency of FQPSK-B DOUBLES (2×) that of pulse code modulation/Frequency modulation (PCM/FM) [5], the enhanced FQPSK, with a simpler transceiver than FQPSK-B, has a channel packing density of TRIPLE (3×) that of PCM/FM. One of the other enhanced FQPSK prototypes has an end to end system loss of only 0.4 dB at BER=1x10^(-3) and 0.5 dB at BER=1x10^(-4) from ideal linearly amplified QPSK theory. The enhanced FQPSK has a simple architecture, thus is inexpensive and has small size, for ultra high bit rate implementation. With low redundancy forward error correction (FEC) coding which expands the spectrum by approximately 10%, further improvement of about 3-4.5dB E N b o is attained with NLA FQPSK-B and enhanced FQPSK at BER=1x10^(-5) .

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Endstrasser, Zdeněk. „Kalibrace a interpretace obrazových dat měřených zařízením LEEM“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443243.

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This thesis deals with the software development to calibration and interpretation of image data measured by a LEEM device. As the imaging technique is uniquely suited for in-situ studies of surface dynamical processes, the attention is mainly paid to methods enabling the evaluation of measurement time series. The phase correlation method based on Fourier transform of images is proposed to temperature shift correction between consecutive frames. The thesis describes the methods of additive and impulse noise filtering, image visualization, the filtration of secondary electrons and the determination of I-V curves from measured image data. Implemented methods are described not only in terms of their mathematical origin, but also with emphasis on the revealing of critical aspects associated with their use. The thesis also focuses on the application of the created algorithm to image data capturing the spatial and temporal evolution of 4,4’-biphenyl-dicarboxylic acid surface phases induced by sample annealing. Based on these evaluations, a suitable procedure is then determined to perform accurate detection and compensation of temperature shift said.

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Grimnell, Mikael, und Mats Tjäder. „Efficient Message Passing Decoding Using Vector-based Messages“. Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5205.

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The family of Low Density Parity Check (LDPC) codes is a strong candidate to be used as Forward Error Correction (FEC) in future communication systems due to its strong error correction capability. Most LDPC decoders use the Message Passing algorithm for decoding, which is an iterative algorithm that passes messages between its variable nodes and check nodes. It is not until recently that computation power has become strong enough to make Message Passing on LDPC codes feasible. Although locally simple, the LDPC codes are usually large, which increases the required computation power. Earlier work on LDPC codes has been concentrated on the binary Galois Field, GF(2), but it has been shown that codes from higher order fields have better error correction capability. However, the most efficient LDPC decoder, the Belief Propagation Decoder, has a squared complexity increase when moving to higher order Galois Fields. Transmission over a channel with M-PSK signalling is a common technique to increase spectral efficiency. The information is transmitted as the phase angle of the signal.

The focus in this Master’s Thesis is on simplifying the Message Passing decoding when having inputs from M-PSK signals transmitted over an AWGN channel. Symbols from higher order Galois Fields were mapped to M-PSK signals, since M-PSK is very bandwidth efficient and the information can be found in the angle of the signal. Several simplifications of the Belief Propagation has been developed and tested. The most promising is the Table Vector Decoder, which is a Message Passing Decoder that uses a table lookup technique for check node operations and vector summation as variable node operations. The table lookup is used to approximate the check node operation in a Belief Propagation decoder. Vector summation is used as an equivalent operation to the variable node operation. Monte Carlo simulations have shown that the Table Vector Decoder can achieve a performance close to the Belief Propagation. The capability of the Table Vector Decoder depends on the number of reconstruction points and the placement of them. The main advantage of the Table Vector Decoder is that its complexity is unaffected by the Galois Field used. Instead, there will be a memory space requirement which depends on the desired number of reconstruction points.

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Reymond, Cédric. „Conception d'une structure innovante de convertisseur AC-DC de type Totem-pole avec correction du facteur de puissance : application aux chargeurs de batteries des véhicules électriques“. Thesis, Tours, 2019. http://www.theses.fr/2019TOUR4015.

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Les gouvernements responsabilisent les états sur l’environnement avec la mise en œuvre de solution pour décarboner la production de l’électricité. En 2020, 20 % de l’énergie produite sera générée par les énergies renouvelables. Cependant ces énergies vertes sont intermittentes et nécessitent une capacité de stockage importante pour la gestion locale des « smart grids ». Cette solution pose deux nouvelles problématiques : la nécessité d’un convertisseur bidirectionnel et la gestion des courants d’appel. Pour faciliter l’étude de ces problématiques, la thèse propose de lier au travers d’un bilan de puissance, les performances des différents limiteurs de courant sur une topologie de convertisseur innovante. Cette analyse permet de mettre en exergue une solution alternative de limitation des courants d’appel dans la conversion de l’énergie. Enfin, un circuit novateur sur le contrôle des composants de puissance de type thyristors/Triacs sera proposé et caractérisé pour palier une des contraintes liées à la réversibilité du convertisseur
Governments empower states over the environment with implementation of solution to clean up the electricity production sources. In 2020, 20% of the produced energy will be generated by renewable energies. However, theses green energies are occasional and require a huge storage capacitance for the local smart grids management. This solution puts two new issues: the necessity of having a bidirectional converter and the inrush currents management. To facilitate the study of these problems, the thesis suggests binding through a power balance, the performances of the current limiter on an innovative topology converter. This analysis highlight an alternative solution of inrush current strategy in energy conversion. Finally, a novel control circuit for SCRs/Triacs components will be proposed and characterized for landing one of the constraints linked to the converter reversibility

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Bücher zum Thema "Shift correction"

Hopkins, Kevin S. Error detection and correction for a multiple frequency quaternary phase shift keyed signal. Monterey, Calif: Naval Postgraduate School, 1989.

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Hoorn, Ewout J., und Robert Zietse. Approach to the patient with hyponatraemia. Herausgegeben von Robert Unwin. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0028.

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Hyponatraemia is the most common electrolyte disorder in hospitalized patients and is primarily a water balance disorder. Therefore, hyponatraemia is due to a relative excess of water in comparison with sodium in the extracellular fluid volume. Hyponatraemia is usually due to the release of vasopressin despite hypo-osmolality; this secretion is either ‘appropriate’ (i.e. due to a low intravascular volume) or ‘inappropriate’. The diagnostic approach to hyponatraemia relies on the assessment of the time of development, symptoms, and volume status, along with laboratory parameters such as urine sodium and urine osmolality. Complications are mainly neurological and usually depend on the rate of development and correction. If hyponatraemia develops acutely, treatment should be directed towards counteracting the water shift to or brain cells. Conversely, in more chronic cases of hyponatraemia, treatment should be directed at the underlying cause, while avoiding over-correction.

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Nguyen, Kim-Phuong, und Chris D. Glover. Anesthetic Considerations for Scoliosis Repair. Herausgegeben von Erin S. Williams, Olutoyin A. Olutoye, Catherine P. Seipel und Titilopemi A. O. Aina. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190678333.003.0032.

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Scoliosis is an anatomical deformity caused by a lateral and rotational shift in the thoracolumbar spine. Surgical correction involves wide exposure of the spine for placement of stabilizing rods and can result in significant complications from excessive blood loss and neurologic impairments. These procedures require vigilance to acid-base status, hemodynamic fluctuations, coagulation, temperature maintenance, and neurologic monitoring from anesthesiologists. Other major anesthetic considerations discussed include maintaining the integrity of perfusion to the spinal cord, positioning concerns, optimal technique for neuromonitoring, and pain control in the perioperative period. This chapter presents a case study of a 14-year-old girl with adolescent idiopathic scoliosis who presents for posterior spinal instrumentation and fusion from T4-L4 with autologous bone graft.

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Morawetz, Klaus. Nonlocal Collision Integral. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0013.

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The kinetic equation with the nonlocal shifts is presented as the final result on the way to derive the kinetic equation with nonlocal corrections. The exclusive dependence of the nonlocal and non-instant corrections on the scattering phase shift confirms the results from the theory of gases. With the approximation on the level of the Brueckner reaction matrix, the corresponding non-instant and nonlocal scattering integral in parallel with the classical Enskog’s equation, can be treated with Monte-Carlo simulation techniques. Neglecting the shifts, the Landau theory of quasiparticle transport appears. In this sense the presented kinetic theory unifies both approaches. An intrinsic symmetry is found from the optical theorem which allows for representing the collision integral equivalently either in particle-hole symmetric or space-time symmetric form.

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Morawetz, Klaus. Properties of Non-Instant and Nonlocal Corrections. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0014.

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The derived nonlocal and non-instant shifts are discussed with respect to various symmetries and gauges. The classical counterparts are derived and found in agreement with the expected phenomenological ones from chapter 3. The explicit forms of the hard-sphere like offsets and the delay time in terms of the scattering phase shifts are calculated and discussed on the example of nuclear collision. The numerical results reveal an interesting inside into the microscopic correlations developed in dependence on the scattering angle and scattering energy. The just-accomplished derivation of the nonlocal scattering integrals is far from being intuitive. We have reached our task, the kinetic equation, being guided by nothing but systematic implementation of the quasiclassical approximation and the limit of small scattering rates.

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Van Baalen, Susan. Islam in American Prisons. Herausgegeben von Jane I. Smith und Yvonne Yazbeck Haddad. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199862634.013.014.

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This chapter explores the gradual legitimization of the beliefs and practices of Islam in US prisons, analyzing the factors that led to the pronounced shift from “Black Muslim” to Sunni Islam over a fifty-five-year period (mid-1950s‒2010). An understanding of the history of prison Islam offers insights into the motivation of black Americans to embrace Islam and the reasons why correctional staff and the general public are suspicious of incarcerated Muslims. Program accommodations to protect prisoners’ religious rights are described to enhance the understanding of the complexities involved in providing a rich experience of Islam during incarceration and preparing prisoners for entry into the wider community of global Islam upon their release. A brief analysis of interactions between various factions—immigrant, black American, Sunni, Shia, Sufi, Salafi, and Wahhabi clarifies issues related to prison conversion to Islam and to the perceived extremist threat created by the mass incarceration of under-educated and marginalized. Muslim prisoners.

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Buchteile zum Thema "Shift correction"

Bellucci, Stefano, Bhupendra Nath Tiwari und Neeraj Gupta. „Phase Shift Correction“. In Geometrical Methods for Power Network Analysis, 61–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33344-6_7.

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Gussen, Benjamen. „Correction to: Axial Shift“. In Axial Shift, C1—C2. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6950-6_15.

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Reinertsen, Ingerid, Maxime Descoteaux, Simon Drouin, Kaleem Siddiqi und D. Louis Collins. „Vessel Driven Correction of Brain Shift“. In Medical Image Computing and Computer-Assisted Intervention – MICCAI 2004, 208–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30136-3_27.

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Castrén, E. A., und J. A. Pohjonen. „Phase Image Correction for Magnetic Resonance Chemical Shift Imaging“. In Computer Assisted Radiology / Computergestützte Radiologie, 46–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-00807-2_8.

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Camellin, Massimo, Diego Ponzin und Samuel Arba-Mosquera. „Solving Refractive Complications after RK Correction of Hyperopic Shift“. In Difficult and Complicated Cases in Refractive Surgery, 425–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55238-0_93.

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Soza, Grzegorz, Peter Hastreiter, Fernando Vega, Christof Rezk-Salama, Michael Bauer, Christopher Nimsky und Günther Greiner. „Non-linear Intraoperative Correction of Brain Shift with 1.5 T Data“. In Informatik aktuell, 21–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-18993-7_5.

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Wein, Wolfgang. „Brain-Shift Correction with Image-Based Registration and Landmark Accuracy Evaluation“. In Simulation, Image Processing, and Ultrasound Systems for Assisted Diagnosis and Navigation, 146–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01045-4_17.

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Kasahara, Tamiko. „Correction to: Knowledge Transfer and Creation Systems: Perspectives on Corporate Socialization Mechanisms and Human Resource Management“. In Paradigm Shift in Technologies and Innovation Systems, C1. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9350-2_12.

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Saitoh, Yuichi, Ikuyo Ibe und Hideki Imai. „Peak-shift and bit error-correction with channel side information in runlength-limited sequences“. In Applied Algebra, Algebraic Algorithms and Error-Correcting Codes, 304–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/3-540-56686-4_52.

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Li, Rui, Xinsheng Huang, Ruitao Lu und Lurong Shen. „Infrared Small Target Tracking Algorithm Based on Fusion Feature Matching and Mean Shift Correction“. In Advances in Intelligent Systems and Computing, 595–603. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-1759-6_68.

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Konferenzberichte zum Thema "Shift correction"

Schonewille, Michel. „Regularization with azimuth time‐shift correction“. In SEG Technical Program Expanded Abstracts 2003. Society of Exploration Geophysicists, 2003. http://dx.doi.org/10.1190/1.1817695.

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Sternberg, Ben K., James C. Washburne und Robert G. Anderson. „Investigation of MT static shift correction methods“. In 1985 SEG Technical Program Expanded Abstracts. SEG, 1985. http://dx.doi.org/10.1190/1.1892688.

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Shihara, Tetsuya, Hiromichi Ishibashi, Katsuya Watanabe und Shin-ichi Kadowaki. „Lens shift correction for DVD-RAM tracking servo“. In International Symposium on Optical Memory and Optical Data Storage. SPIE, 1999. http://dx.doi.org/10.1117/12.997639.

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Zamyatin, Alexander A., Ilmar A. Hein, Michael D. Silver und Satoru Nakanishi. „Up-sampling with Shift Method for Windmill Correction“. In 2006 IEEE Nuclear Science Symposium Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/nssmic.2006.354371.

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Pham, Tuan Q., und Matthew Duggan. „Bidirectinal bias correction for Gradient-Based Shift Estimation“. In 2008 15th IEEE International Conference on Image Processing. IEEE, 2008. http://dx.doi.org/10.1109/icip.2008.4711883.

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Gonzalez, J., D. Sosa-Cabrera, M. Ortega, J. A. Gil, A. Tristan, E. Munoz-Moreno, R. de Luis-Garcia und R. Cardenes. „P2C-3 Ultrasound Based Intraoperative Brain Shift Correction“. In 2007 IEEE Ultrasonics Symposium Proceedings. IEEE, 2007. http://dx.doi.org/10.1109/ultsym.2007.395.

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Tang, Wenwu, Yaoguo Li, Douglas W. Oldenburg und Jianxin Liu. „Magnetotelluric static shift correction using an equivalent source technique“. In SEG Technical Program Expanded Abstracts 2014. Society of Exploration Geophysicists, 2014. http://dx.doi.org/10.1190/segam2014-1621.1.

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Goossens, Thomas, Kathleen Vunckx, Andy Lambrechts und Chris Van Hoof. „Spectral Shift Correction for Fabry-Perot Based Spectral Cameras“. In 2019 10th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS). IEEE, 2019. http://dx.doi.org/10.1109/whispers.2019.8920890.

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Zhang, Kun, und Jiayong Yan. „The 3D magnetotelluric inversion system with static shift correction“. In 7th International Conference on Environment and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iceeg-16.2016.105.

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Makarau, Aliaksei, Henkjan Huisman, Roel Mus, Miranda Zijp und Nico Karssemeijer. „Breast MRI intensity non-uniformity correction using mean-shift“. In SPIE Medical Imaging, herausgegeben von Nico Karssemeijer und Ronald M. Summers. SPIE, 2010. http://dx.doi.org/10.1117/12.845612.

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Berichte der Organisationen zum Thema "Shift correction"

Erck, R. A. Correction of energy shift in measurements of solute segregation by Rutherford backscattering spectroscopy. Office of Scientific and Technical Information (OSTI), Februar 1991. http://dx.doi.org/10.2172/10142456.

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Brown, Tristan Brooks, und Matthew James Devlin. Gain Shift Corrections at Chi-Nu. Office of Scientific and Technical Information (OSTI), August 2016. http://dx.doi.org/10.2172/1312624.

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Rhoades-Brown, M. J. Analytic Evaluation of Tune Shift Due to Octupole Corrections. Office of Scientific and Technical Information (OSTI), September 1989. http://dx.doi.org/10.2172/1119103.

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McConville, G. T. Analysis of phase shift calculations used in second virial corrections for helium gas thermometry. Office of Scientific and Technical Information (OSTI), März 1989. http://dx.doi.org/10.2172/6450923.

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