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Search Results: 1 - 10 of 402485 matches for " H. J. "
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Adaptive Parallel Computation for Blind Source Separation with Systolic Architecture  [PDF]
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21006
Abstract: The purpose of Blind Source Separation (BSS) is to obtain separated sources from convolutive mixture inputs. Among the various available BSS methods, Independent Component Analysis (ICA) is one of the representative methods. Its key idea is to repetitively update and calculate the measures. However, dealing with the measures obtained from multi-array sensors causes obstacles for real-time use. In order to solve this problem, it is necessary to convert the software implementation of BSS algorithm into the hardware architecture. Through the use of hardware architecture, the BSS algorithm can efficiently work within a relatively short time. In this study, we investigate a practical method using a parallel algorithm and architecture for hardware use in a blind source separation. We design a feedback network for real-time speech signal processing. The network is composed of forward and updates algorithms. The architecture of the network is systolic and therefore it is suitable for parallel processing. We only have to add and connect modules for scaling. This paper covers the process from the systolic design of BSS to the hardware implementation using Xilinx FPGAs. The simulation results of our proposed implementation are also represented in the experimental section. In that section, our architecture returns satisfying results with robust qualities.
Short-term Distributed Energy Resource Scheduling for a DC Microgrid  [PDF]
G. W. Chang, H. J. Lu, H. J. Su
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B003
Abstract: A microgrid is associated with a low voltage distribution power network and inherits small modular generation systems and loads that have certain coordinated functions to provide the solution to supply premium power to remote or specific areas. Similar to conventional power systems, the energy management of distributed generation resources (DERs) is carried out to minimize the operation cost and maximize benefit of installation of DERS in a microgrid. This paper presents the process of implementing the short-term DER scheduling function for a dc microgrid. The optimal scheduling results for two operation modes are then reported.
The Hidden Risk Factor  [PDF]
J. H. Witte, D. Ples, J. Corominas
Journal of Mathematical Finance (JMF) , 2013, DOI: 10.4236/jmf.2013.33A003

To achieve maximum returns consistent with an investor’s appetite for risk, the correct identification and estimation of all relevant risk factors in a portfolio are necessary. In this paper, we identify the role of foreign currency as an important risk factor from an international investor’s point of view.

Prof. Dr. Johannes Christiaan Coetzee, M.A. M.Ed. D.Phil. (S.A.), F.B.Ps.S., as akademikus
H. J. J. Blingle
Koers : Bulletin for Christian Scholarship , 1953, DOI: 10.4102/koers.v20i5.2008
Abstract: Om in die bestek van ’n kort artikel soos hierdie prof. Coetzee as akademikus tot sy reg te laat horn, is beslis ’n onbenydenswaardige taak.
Onderwys in Afrika
H. J. J. Bingle
Koers : Bulletin for Christian Scholarship , 1958, DOI: 10.4102/koers.v26i5&6.1655
Abstract: Vergelykende opvoedkundige studie: By ’n onderwerp soos die onderhawige, waarin dit gaan oor die onderwys van ’n groot aantal geweste wat baie van mekaar verskil t.o.v. politiek, ekonomie, ras, maatskaplike toestande, ens., moet daar noodwendig op die terrein van die Vergelykende Opvoedkunde getree word wat vandag reeds vaste oogmerke en metodes van ondersoek ontwikkel het. Wil ons dus enigsins aanspraak maak op wetenskaplikheid met ons onderwerp, moet ons die prosedure wat algemeen in toepassing is ook hier gebruik.
Die terrein van die empiriese opvoedkunde
H. J. J. Bingle
Koers : Bulletin for Christian Scholarship , 1950, DOI: 10.4102/koers.v18i3.1724
Recovery of Vestibular Ocular Reflex Function and Balance Control after a Unilateral Peripheral Vestibular Deficit
J. H. J. Allum
Frontiers in Neurology , 2012, DOI: 10.3389/fneur.2012.00083
Abstract: This review describes the effect of unilateral peripheral vestibular deficit (UPVD) on balance control for stance and gait tests. Because a UPVD is normally defined based on vestibular ocular reflex (VOR) tests, we compared recovery observed in balance control with patterns of recovery in VOR function. Two general types of UPVD are considered; acute vestibular neuritis (AVN) and vestibular neurectomy. The latter was subdivided into vestibular loss after cerebellar pontine angle tumor surgery during which a vestibular neurectomy was performed, and vestibular loss following neurectomy to eliminate disabling Ménière’s disease. To measure balance control, body-worn gyroscopes, mounted near the body’s center of mass (CoM), were used. Measurement variables were the pitch (anterior–posterior) and roll (lateral) sway angles and angular velocities of the lower trunk/pelvis. Both patient groups showed balance deficits during stance tasks on foam, especially with eyes closed when stable balance control is normally highly dependent on vestibular inputs. Deficits during gait were also present and were more profound for complex gait tasks such as tandem gait than simple gait tasks. Major differences emerged between the groups concerning the severity of the deficit and its recovery. Generally, the effects of acute neuritis on balance control were more severe but recovered rapidly. Deficits due to vestibular neurectomy were less severe, but longer lasting. These results mostly paralleled recovery of deficits in VOR function. However, questions need to be raised about the effect on balance control of the two modes of neural plasticity occurring in the vestibular system following vestibular loss due to neuritis: one mode being the limited central compensation for the loss, and the second mode being some restoration of peripheral vestibular function. Future work will need to correlate deficits in balance control during stance and gait more exactly with VOR deficits and carefully consider the differences between insufficient central compensation compared to inadequate peripheral restoration of function.
Sampling and Reconstruction of Zero-Order Hold Signals by Parallel RC Filters  [PDF]
J.T Olkkonen, H Olkkonen
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.23022
Abstract: In this work we describe a reconstruction algorithm for zero-order hold (ZOH) waveforms measured by a parallel sam-pling scheme. In the method the ZOH signal is fed to a parallel network consisting of resistor-capacitor (RC) filters, whose outputs are sampled simultaneously. The algorithm reconstructs N previous samples of the input signal from output samples of N parallel RC circuits. The method is especially useful in sampling and reconstruction of the ZOH signals produced by the digital-to-analog converters. Using the parallel sampling method the sampling rate of the analog-to-digital converters can be increased by a factor of N. We discuss a variety of applications such as reconstruction of ZOH pulse sequences produced by ultra wide band (UWB) transmitters.
Predicting Job Dissatisfaction among Community Junior Secondary School Teachers in Botswana  [PDF]
M. N. Isaiah, H. J. Nenty
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.33039
Abstract: African governments tend to refuse to accept the obvious truth that dissatisfaction among teachers has contributed significantly to their inability to attain their educational goals at all levels. A disgruntled worker cannot put in assiduous effort at achieving set goals, especially goals whose levels of achievement are not readily obvious. The spirit underlying the natural pride of contributing to the growth and development of human beings is greatly robbed by the dissatisfaction among teachers. This study tries to determine what factors predict this dissatisfaction among teachers in community junior secondary schools in the South Central Region of Botswana. To determine these for teachers in the 55 community junior secondary schools in the South Central Region of Botswana, a validated 68-item questionnaire with 6-Likert-type options designed to measure level of job satisfaction and factors that influence it were administered to 255 teachers from 12 randomly selected schools in the area. A stepwise regression analysis of the resulting data showed that of the nine variables that combine to account for 57% of the variability in the level of teacher’s job dissatisfaction, refusal by parents to be involved in the education of their children accounted for 34% of such variance. The findings were discussed and recommendations made.
The Assessment of Non-Linear Effects in Clinical Research  [PDF]
Ton J. Cleophas, Aeilko H. Zwinderman
Pharmacology & Pharmacy (PP) , 2012, DOI: 10.4236/pp.2012.32021
Abstract: Background: Novel models for the assessment of non-linear data are being developed for the benefit of making better predictions from the data. Objective: To review traditional and modern models. Results, and Conclusions: 1) Logit and probit transformations are often successfully used to mimic a linear model. Logistic regression, Cox regression, Poisson regression, and Markow modeling are examples of logit transformation; 2) Either the x- or y-axis or both of them can be logarithmically transformed. Also Box Cox transformation equations and ACE (alternating conditional expectations) or AVAS (additive and variance stabilization for regression) packages are simple empirical methods often successful for linearly remodeling of non-linear data; 3) Data that are sinusoidal, can, generally, be successfully modeled using polynomial regression or Fourier analysis; 4) For exponential patterns like plasma concentration time relationships exponential modeling with or without Laplace transformations is a possibility. Spline and Loess are computationally intensive modern methods, suitable for smoothing data patterns, if the data plot leaves you with no idea of the relationship between the y- and x-values. There are no statistical tests to assess the goodness of fit of these methods, but it is always better than that of traditional models.
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