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Search Results: 1 - 10 of 14296 matches for " Mohammad mahdi Ghasemi "
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Investigation of Tinnitus Characteristics in 36 Patients with Subjective Tinnitus with Unknown Etiology
Mahdi Bakhshaee,Mohammad mahdi Ghasemi,Ehsan Khadivi,Saman Rezaei
Audiology , 2006,
Abstract: Background and Aim: Tinnitus represents the perception of sound without an external stimulus. The prevalence of tinnitus ranges from 3% to 30%. In most cases its etiology is unknown. Tinnitus can be classified as pulsatile or nonpulsatile. Nonpulsatile form is the most common form and almost exclusively subjective in nature. There is a range of condition attributed to nonpulsatile high frequency tinnitus (acoustic neuroma, Meniere’s disease, ototoxic agents, and noise exposure, etc). There are many studies about form, site, loudness, and frequency of tinnitus and how it can affect the quality of patient life. Materials and methods: This was a descriptive and analytic study. Thirty-six patients (23 men and 13 women) with mean age 53.1 year old with subjective tinnitus evaluated in Pezhvak audiometric clinic in Mashhad.The data consisting of age sex, loudness, frequency form and site of tinnitus. Evaluation of effects of tinnitus on the quality of life and habits was performed with a tinnitus questionnaire (TQ). Results: Tinnitus was unilateral in 64% of cases. The right site was more common. Mean pitch was 7.03 kHz and average loudness was 3.8 dB SPL. SDS was in normal range in all of patients. There was a high frequency sensory neural hearing loss (above the 4 kHz) in most of the patients. The greatest score (60.3%) of TQ related to intrusiveness aspect. Sleep disorder has the lowest score (39/3%). Global score was 52.4%. Conclusion: Nonpulsatile subjective tinnitus has a broad range of etiology with unknown mechanism in most cases and without any history of underlying disease in a large group of patients. This symptom mostly involves the patients` lifestyle that is intrusiveness aspect in comparison with the other aspects including sleep, hearing and somatic complaints. There is no cure for most patient and more studies are needed in the future.
Incidence of Hearing Abnormality in Neonate Intensive Care Unit Hospitalized Neonate
Mohammad Mahdi Ghasemi,Mohammad Taghi Shakeri,Saman Rezaei,Ali Dashti
Audiology , 2006,
Abstract: Background and Aim: Risk factors including asphyxia, meningitis, form of delivery, etc may cause hearing loss in neonates results in speech and language deprivation, emotional and educational problems. The aim of this study was to determine the prevalence of hearing loss and its relationship with risk factors among neonates hospitalized in neonate intensive care unit (NICU). Materials and Methods: It was a cross-sectional study on 234 NICU hospitalized neonates in Ghaem and Imam-Reza hospitals of Mashhad. Epidemiologic and pathologic information were obtained. Otoacoustic emissions were done in all of neonates. Patients referred to the second otoacoustic emissions (OAEs) and patients failed in the second test controlled by auditory brainstem response (ABR). Results: Hearing abnormality was found in 11 neonates (4.7%) including 2 girls and 9 boys. (1 neonate with mild, 2 with mild to moderate, 2 with moderate to severe, 1 with sever to profound hearing loss and 4 with auditory neuropathy). Hearing abnormality has a significant greater incidence in group with apgar 5 and in patients with icterus (in need with transfusion). Conclusion: Incidence of hearing loss in NICU hospitalized neonates is greater in comparison with general population. It has a greater incidence in group with icterus (in need with transfusion) and apgar 5, so, a comprehensive hearing screening program must be applied for early identification and intervention.
Determination of Trace Elements in Patients With Chronic Hepatitis B
Saeid Abediankenari,Maryam Ghasemi,Mohammad Mahdi Nasehi,Siavash Abedi
Acta Medica Iranica , 2011,
Abstract: Chronic Hepatitis B virus (HBV) infection is a major liver disease worldwide and its clinical manifestations are linked to immune response. The purpose of this study was to evaluate the relationship between selenium, copper, and zinc in comparison with transaminase level in chronic HBV patients. Serum samples of the HBV infected patients were obtained from Tooba medical center, Sari, Iran. Sixty patients were enrolled in this study (36 men and 24 women), mean age: 39.6 ± 12.2 years. The concentration of zinc, selenium, copper and transaminases were determined using an autoanalyzer system. Concentrations of selenium (0.273 ±0.056 μg/dl) and zinc (2.1±0.037) was elevated in patients with low transaminase levels as were significantly different in comparison with patients with high transaminase level (P<0.05). Serum copper concentration was similar in two groups of patients. Elevated levels of transaminase concentrations were independently associated with low zinc and selenium concentrations in chronic HBV patients. It is concluded that serum zinc and selenium levels are associated with less hepatic damage in chronic HBV patients and might have a protective role during liver injury.
Wavelet Density Estimation and Statistical Evidences Role for a GARCH Model in the Weighted Distribution  [PDF]
Mohammad Abbaszadeh, Mahdi Emadi
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.42061
Abstract:

We consider n observations from the GARCH-type model: Z = UY, where U and Y are independent random variables. We aim to estimate density function Y where Y have a weighted distribution. We determine a sharp upper bound of the associated mean integrated square error. We also make use of the measure of expected true evidence, so as to determine when model leads to a crisis and causes data to be lost.

Examining the Relationship of Organizational Agility and Organizational Forgetting with Organizational Effectiveness  [PDF]
Gholamreza Mohammad Ghasemi, Hossein Jenaabadi
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.83045
Abstract: This study aimed to investigate the relationship of organizational agility and organizational forgetting with organizational effectiveness among staff of the education administration of Zahedan. The population of this study included a total of 645 staff of the education administration of Zahedan who served in the 2013-14 school year. Using the Krejcie-Morgan table, 200 individuals were selected through applying stratified random method. To collect data, three questionnaires including Organizational Agility [1], Organizational Forgetting [2] and Organizational Effectiveness [3] were used. Content validity of these questionnaires was approved by the faculty members of the Department of Management and confirmatory factor analysis was used to ensure the results. In addition, Cronbach’s alpha for the scales of organizational agility, organizational effectiveness and organizational forgetting was calculated, which was 0.73, 0.74 and 0.76, respectively. The results showed that there was a significant positive correlation between organizational agility and organizational effectiveness. Moreover, there was a significant positive relationship between organizational forgetting and organizational agility. In addition, there was a significant positive relationship between organizational forgetting and the components of organizational effectiveness. Additionally, there was a significant positive correlation between organizational agility and the components of organizational effectiveness.
Improvment of Free Convection Heat Transfer Rateof Rectangular Heatsink on Vertical Base Plates  [PDF]
HamidReza Goshayeshi, Mahdi Fahiminia, Mohammad Mahdi Naserian
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.34064
Abstract: In this paper, the laminar heat transfer of natural convection on vertical surfaces is investigated. Most of the studies on natural convection have been considered constantly whereas velocity and temperature domain, do not change with time, transient one are used a lot. Governing equations are solved using a finite volume approach. The convective terms are discretized using the power-law scheme, whereas for diffusive terms the central difference is employed. Coupling between the velocity and pressure is made with SIMPLE algorithm. The resultant system of discretized linear algebraic equations is solved with an alternating direction implicit scheme. Then a configuration of rectangular fins is put in different ways on the surface and heat transfer of natural convection on these surfaces without sliding is studied and finally optimization is investigated.
A New Method of Voiced/Unvoiced Classification Based on Clustering  [PDF]
Mojtaba Radmard, Mahdi Hadavi, Mohammad Mahdi Nayebi
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24048
Abstract: In this paper, a new method for making v/uv decision is developed which uses a multi-feature v/uv classification algorithm based on the analysis of cepstral peak, zero crossing rate, and autocorrelation function (ACF) peak of short-time segments of the speech signal by using some clustering methods. This v/uv classifier achieved excellent results for identification of voiced and unvoiced segments of speech.
Distributed versus Lumped Optimization of Cropping Pattern and Water Resources Utilization  [PDF]
Mohammad Mehdi Ghasemi, Mohammad Karamouz, Lee Teang Shui
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.54029
Abstract:

Several whole-farm agro-economic optimization models have been developed to deal with lumped planning issues in the agriculture sector. However, these models cannot be used to devise appropriate management strategies at land parcel level, because of the differences between farm characteristics, and the increased complexity of the hydrological processes. Based on Spatial Farm Database (SFD) which is consisted of a number of farm-level spatial data, including location, paddock properties, owner specifications and budgets, it is possible to provide the farm manager with some suggestions regarding the optimal choice of crops and the area to be allocated for each one. To this end, genetic algorithm is used in order to cope with model nonlinearity and a large number of decision variables. In order to test the proposed model, the Mobarakabad district is modeled with 126 agriculture fields, and the optimization model is run for this area. Results showed that the optimization procedure can find more realistic farm-level optimal solutions due to its advantage in adequate modeling of field characteristics, common groundwater resources, and the associated constraints. The results of lumped optimizations could also be used as benchmarks for the purposes of comparison and interpretation.

Going Concern Prediction of Iranian Companies by Using Fuzzy C-Means  [PDF]
Mahdi Moradi, Mahdi Salehi, Hadi Sadoghi Yazdi, Mohammad Ebrahim Gorgani
Open Journal of Accounting (OJAcct) , 2012, DOI: 10.4236/ojacct.2012.12005
Abstract: Decision-making problems in the area of financial status evaluation have been considered very important. Making incorrect decisions in firms is very likely to cause financial crises and distress. Predicting going concern of factories and manufacturing companies is the desire of managers, investors, auditors, financial analysts, governmental officials, employees. This research introduces a new approach for modeling of company’s behavior based on Fuzzy Clustering Means (FCM). Fuzzy clustering is one of well-known unsupervised clustering techniques, which allows one piece of data belongs to two or more clusters. The data used in this research was obtained from Iran Stock Market and Accounting Research Database. According to the data between 2000 and 2009, 70 pairs of companies listed in Tehran Stock Exchange are selected as initial data set. Our experimental results showed that FCM approach obtains good prediction accuracy in developing a financial distress prediction model. Also, in effective features determination test the results show that features based on cash flows play more important role in clustering two classes.
Stress Intensity Factors in Two Bonded Elastic Layers Containing Crack Perpendicular on the Interface with Different Elastic Properties  [PDF]
Mahdi Keikhaie, Nasser Keikhaie, Reza Keikhaie, Mohammad Mahdi Kaykha
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65070
Abstract: Thin bonded films have many applications (i.e. in information storage and processing systems, and etc.). In many cases, thin bonded films are in a state of residual tension, which can lead to film cracking and crack extension in one layer often accompanies failure in whole systems. In this paper, we analyze a channel crack advanced throughout thickness of an elastic thin film bonded to a dissimilar semi-infinite substrate material via finite element method (FEM). In order to simplify modeling, the problem is idealized as plane strain and a two-dimensional model of a film bonded to an elastic substrate is proposed for simulating channel crack in thin elastic film. Film is modeled by common 4-node and substrate by infinite 4-node meshes. The stress intensity factor (SIF) for cracked thin film has been obtained as a function of elastic mismatch between the substrate and the film. The results indicate that in elastic mismatch state, SIF is more than match state. On the other hand, mismatch state is more sensitive to crack than match state. And SIF has also increased by increasing Young’s modulus and Poisson ratio of film.
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