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OALib Journal期刊

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Comparison of Working Memory in Hearing Loss and Normal Children
Mohammad Rezaei,Gohar Lotfi,Farzad Wiesi
Pajouhan Scientific Journal , 2012,
Abstract: Introduction: Hearing loss children may have problems in auditory-verbal memory due to impaired auditory input, but likely they have no deficit in visual-verbal memory because of intact visual input. In this study auditory-verbal and visual-verbal memory of sever to moderate (56-70 dB) hearing loss students in special schools compared with normal group.Materials and Methods: In this descriptive cross sectional study, hearing loss and normal children compared by means of working memory subtest of "reading and writing in elementary school students test".Results: The findings indicated that hearing impaired children on sound, word and sentence auditory-verbal memory were significantly weaker than the control group, but they had similar function in sound (reverse) auditory-verbal memory skill with their. Normal and hearing impaired group have similar performance in letter and picture visual-verbal memory.Conclusion: According to the results seems hearing impairment is the cause of poor performance in auditory working memory. Also children with hearing impairment have the same function in tasks based on visual processing to normal children, whereas, in tasks based on auditory processing are weaker than them.
A Fixed Point Method for Convex Systems  [PDF]
Morteza Kimiaei, Farzad Rahpeymaii
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330189
Abstract: We present a new fixed point technique to solve a system of convex equations in several variables. Our approach is based on two powerful algorithmic ideas: operator-splitting and steepest descent direction. The quadratic convergence of the proposed approach is established under some reasonable conditions. Preliminary numerical results are also reported.
Landslide Hazard Mapping of Nagadhunga-Naubise Section of the Tribhuvan Highway in Nepal with GIS Application  [PDF]
Arjun Raj Pandey, Farzad Shahbodaghlou
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.66059
Abstract: The aim of this project was to prepare and study a hazard map of Nagadhunga-Naubise section of the Tribhuvan highway. This section lies in the Middle Mountain region of Nepal. For the preparation of the hazard map of the corridor three steps, initial study, field investigation, and data analysis and presentation were carried out. In the initial study, the collection of available data and review of the literature were done. The base map was then prepared from the topographical map. In the field investigation step, all information and maps prepared earlier in the initial study were verified by field check. In the final step, prepared and verified data were then analyzed for the hazard mapping. Topography (gradient, slope shape and slope aspect), geology, drainage and land-use were considered to be the major influencing factors in the slope stability. Pre-assigned hazard rating method was used for hazard mapping of the study area. The area was divided into equal facets. Then ratings of responsible factors to the hazard were assigned to each facet and overlaid based upon a predetermined rating scheme. Total estimated hazard was the sum of these ratings for each overlay. Hazard map was prepared by using three categories as low hazard, medium hazard and high hazard. The Geographic Information System (GIS) was the main tool for the data input, analysis, and preparing of the final hazard map. The hazard map showed the areas of different hazard potential classes of; “low” with 32% portion, “Medium” with 51%, and “high” with 17% portion.
Asymmetrical Gating with Application on Maneuvering Target Tracking
Farzad Hashemzadeh
Applied Computational Intelligence and Soft Computing , 2012, DOI: 10.1155/2012/670485
Abstract: A new asymmetrical gate with application in target tracking is proposed. Proposed gate has asymmetric shape that has large probability of target detection in the gate and has more advantages compared with elliptical gate. The gate is defined as the region in which the tracked target is expected to exist and just observation vectors in the gate are used as target detection. An analytical method to compute optimal size of gate is proposed and recursive estimation of asymmetric parameters of gate are studied. Comparison between proposed gate and conventional elliptical gate showed the efficiency of the proposed method in maneuvering target tracking applications and simulation results showed the proficiency of the proposed method. 1. Introduction Tracking is meant to be the estimation of the true values of specifications of target motion, such as the position and velocity, based on the n-dimensional observational vector by the sensors [1–3]. One-dimensional observation vectors are obtained in a direction-finding setup observing just the azimuth angle [4]. Two-dimensional observation vectors are obtained in optical sensors observing the azimuth angle and elevation angle, or in radars observing the range and azimuth angle. Historically, PDA (Probabilistic Data Association) [5], JPDA (Joint PDA) [6], and MHT (Multiple Hypothesis Tracking) [7–9] have drawn attention as target tracking methods in an environment in which false signals from objects other than the target such as clutter exist [10, 11]. In target tracking in such an environment, just the region is considered for each target in which the target is expected to exist at the next sampling time [12]. This region is called the gate. The observation data within the gate are used for tracking. Various gate shapes are conceivable, such as a rectangle, circle, and ellipse. However, it is not known which shape of gate is optimum. If the gate is enlarged, many observation vectors from clutter or objects other than the target fall within the gate, resulting in some difficulties in target tracking. On the other hand, if the gate is made smaller, there is a danger that the observation data from the target to be tracked may not fall within the gate. It is more desirable that the position of the observation vector detected from the target be closer to the center of the gate compared with location of the false signals in the gate [13]. A method of determining the in-gate probability has been proposed in [10]. In this paper, asymmetrical gaussian distribution is introduced. Cross-surface of asymmetrical gaussian
Tuberculosis and Traditional Medicine: Fighting the Oldest Infectious Disease Using the Oldest Source of Medicines
Farzad Kobarfard
Iranian Journal of Pharmaceutical Research , 2004,
Abstract:
Effects of extremely low-frequency electromagnetic field on fertility and heights of epithelial cells in pre-implantation stage endometrium and fallopian tube in mice
Farzad RAJAEI
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To investigate the effects of extremely low-frequency electromagnetic field (ELF-EMF) on fertility and heights of epithelial cells in pre-implantation stage endometrium and fallopian tube in mice.Methods: Eighty female NMRI mice were randomly divided into 2 groups: control group was not exposed to EMF and experimental group was exposed to 4-hour EMF per day, 6 days a week for 2 weeks to 50 Hz, 0.5 mT EMF. Female mice in two groups were superovulated and mated with male mice over night. At the time of implantation, the blastocysts were obtained from the presumed pregnant mice with vaginal plug by flushing the uterus horns. The samples of uterus horns and fallopian tubes in two groups were taken and were processed for light microscopic studies. Results: The analysis of mean number of the flushed blastocysts in the EMF group showed significant decrease as compared with the control group (P<0.03). Light microscopic study showed that the height of fallopian tube epithelial cells was significantly increased in the EMF group as compared with the control group (P<0.001). However the height of endometrial epithelial cells in the EMF group showed insignificant increase as compared with the control group.Conclusion: The results indicate that ELF-EMF has detrimental effect on female reproductive system in mice by decreasing the number of flushed blastocysts and increasing the height of fallopian tube epithelial cells.
Measurement of Intracranial Pressure Through Ear Canal
Farzad Mobedshahi
Audiology , 1996,
Abstract: Transmission of intracranial pressure (ICP) to the perilymph is performed through cochlear aqueduct and also by other ways. Indirect measurement of perilymphatic pressure may be investigated by observing tympanic membrane (TM) displacement during stapedial reflex contraction, the tympanic membrane displacement (TMD) measurements. This non-invasive technique of examining intracranial pressure (ICP) can be effective in patients suffering abnormal cerebral pathology that could lead in Changes in ICP. It would also be effective in regular monitoring of hydrocephalus patients. This study has a look on this technique which has been reported to provide a reliable, non-invasive measure of ICP.
History of Evolusion of Auditory Tests Evaluating Function of Peripheral Auditory System:A Review Article
Farzad Mobedshahi
Audiology , 1992,
Abstract: In the current article we will have a look at the evolusion of audiological tests. Based on the Olsen's theory,having knowledge about the history of audiological evaluation is not a platitudinous issue, Rather an audiologist should have a comprehensive knowledge about it and be involved in its progress. In this way he can attain enough expertise and science to make use of the technology.The oldest history regarding to this issue goes back to the 16th century,although It should be considered that other related investigations about sound, hearing and related fields has heretofore been performed and the relevant investgigators should not be ignored.
Ultrasound Application in Audiology
Farzad Rahimi
Audiology , 1992,
Abstract: Diagnostic ultrasound is a beneficial technique which can be used the audiologists based on essential instruction. Although there are a lot of barriers in relation to the size of the probe and the resolution of the pictures which are obtained,with this method some kind of information can be gained that is impossible to get by any other method. The ability of real- time A and B modes for direct visualization makes them useful tools to study the changes of the ear structures. Ultrasound system is a useful method to evaluate dizzy patients, which can be potentially used along with vestibular tests.
Application of Ultrasound in Audiology
Farzad Rahimi
Audiology , 1993,
Abstract: Diagnostic ultrasound is a beneficial technique which can be used the audiologists based on essential instruction. Although there are a lot of barriers in relation to the size of the probe and the resolution of the pictures which are obtained, with this method some kind of information can be gained that is impossible to get by any other method. The ability of real- time A and B modes for direct visualization makes them useful tools to study the changes of the ear structures. Ultrasound system is a useful method to evaluate dizzy patients, which can be potentially used along with vestibular tests.
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