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Search Results: 1 - 10 of 12985 matches for " Mohammad Danesh "
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Application of Adomian’s Decomposition Method for the Analytical Solution of Space Fractional Diffusion Equation  [PDF]
Mehdi Safari, Mohammad Danesh
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.16062
Abstract: Spatially fractional order diffusion equations are generalizations of classical diffusion equations which are increasingly used in modeling practical super diffusive problems in fluid flow, finance and others areas of application. This paper presents the analytical solutions of the space fractional diffusion equations by Adomian’s decomposition method (ADM). By using initial conditions, the explicit solutions of the equations have been presented in the closed form. Two examples, the first one is one-dimensional and the second one is two-dimensional fractional diffusion equation, are presented to show the application of the present techniques. The present method performs extremely well in terms of efficiency and simplicity.
Aggressive angiomyxoma of the vulva: dramatic response to gonadotropin-releasing hormone agonist therapy
Azar Danesh,Mohammad Hossein Sanei
Journal of Research in Medical Sciences , 2007,
Abstract: Aggressive angiomyxoma is a rare soft tissue neoplasm that usually arises within the perineum. It often occurs as a vulvar mass and clinically simulates a Bartholin's gland cyst. Most patients are in the second or third decade of life, but some cases have also been reported in children. This is the report of a 21 year old woman with 4.5 × 3 × 1.5 cm mass in right labia major. The patient underwent wide local excision surgical treatment. Histological examination showed high vascular myxoid tumor containing spindle cells. Immunohistochemical study of cells showed positive reaction to estrogen and progesterone and negative reaction to S100, SMA and desmin. Treatment with a gonadotropin-releasing hormone agonist was administered to deal with residual tumor and prevent local recurrence for 6 months. KEY WORDS: Aggressive angiomyxoma, vulva, pregnancy, Gonadotropin releasing hormone agonist.
A Comparison between Major Factor Extraction and Factor Rotation Techniques in Q-Methodology  [PDF]
Noori Akhtar-Danesh
Open Journal of Applied Sciences (OJAppS) , 2017, DOI: 10.4236/ojapps.2017.74013
Abstract: The statistical analysis in Q-methodology is based on factor analysis followed by a factor rotation. Currently, the most common factor extraction methods are centroid and principal component extractions and the common techniques for factor rotation are manual rotation and varimax rotation. However, there are some other factor extraction methods such as principal axis factoring and factor rotation methods such as quartimax and equamax which are not used by Q-users because they have not been implemented in any major Q-program. In this article we briefly explain some major factor extraction and factor rotation techniques and compare these techniques using three datasets. We applied principal component and principal axis factoring methods for factor extraction and varimax, equamax, and quartimax factor rotation techniques to three actual datasets. We compared these techniques based on the number of Q-sorts loaded on each factor, number of distinguishing statements on each factor, and excluded Q-sorts. There was not much difference between principal component and principal axis factoring factor extractions. The main findings of this article include emergence of a general factor and a smaller number of excluded Q-sorts based on quartimax rotation. Another interesting finding was that a smaller number of distinguishing statements for factors based on quartimax rotation compared to varimax and equamax rotations. These findings are not conclusive and further analysis on more datasets is needed.
Using Cohen’s Effect Size to Identify Distinguishing Statements in Q-Methodology  [PDF]
Noori Akhtar-Danesh
Open Journal of Applied Sciences (OJAppS) , 2018, DOI: 10.4236/ojapps.2018.82006
Abstract: Q-methodology was introduced more than 80 years ago to study subjective topics such as attitudes, perceptions, preferences, and feelings and there has not been much change in its statistical components since then. In Q-methodology, subjective topics are studied using a combination of qualitative and quantitative techniques. It involves development of a sample of statements and rank-ordering these statements by study participants using a grid known as Q-sort table. After completion of Q-sort tables by the participants, a by-person factor analysis (i.e., the factor analysis is performed on persons, not variables or traits) is used to analyze the data. Therefore, each factor represents a group of individuals with similar views, feelings, or preferences about the topic of the study. Then, each group (factor) is usually described by a set of statements, called distinguishing statements, or statements with high or low factor scores. In this article, we review one important statistical issue, i.e. the criteria for identifying distinguishing statements and provide a review of its mathematical calculation and statistical background. We show that the current approach for identifying distinguishing statements has no sound basis, which may result in erroneous findings and seems to be appropriate only when there are repeated evaluations of Q-sample from the same subjects. However, most Q-studies include independent subjects with no repeated evaluation. Finally, a new approach is suggested for identifying distinguishing statements based on Cohen’s effect size. We demonstrate the application of this new formula by applying the current and the suggested methods on a Q-dataset and explain the differences.
Effects of Immediate Orthodontic and Orthopedic Forces on Peri-Miniscrew Bones: Histomorphologic and Histomorphometric Assessment in Dogs
Mansour Rismanchian,Sayed Hamid Raji,Danesh Teimori Rik,Sayed Mohammad Razavi
International Journal of Dentistry , 2012, DOI: 10.1155/2012/851740
Unoccluded Earmold
Aliasghar Danesh
Audiology , 1992,
Abstract: It has always been attempted that systems connected to the ear through hearing aids efficiently meet the patient expectations. It is recommended to avoid using occluded earmolds when the hearing is normal or there is mild hearing loss. In order that natural sound reaches to the ear, the ear canal should stay open as much as possible.To achieve the above goal and the suitable acoustic modifications, non-occluding ear molds are beneficial.
Effects of Immediate Orthodontic and Orthopedic Forces on Peri-Miniscrew Bones: Histomorphologic and Histomorphometric Assessment in Dogs
Mansour Rismanchian,Sayed Hamid Raji,Danesh Teimori Rik,Sayed Mohammad Razavi,Navid Khalighinejad,Hossein Goroohi,Hamid Badrian
International Journal of Dentistry , 2012, DOI: 10.1155/2012/851740
Abstract: Aim. The aim of this study was histomorphologic and histomorphometric evaluation of peri-screw bone after immediate orthodontic and orthopedic forces and comparing them with a control group. Materials and Methods. 18 dual-top miniscrews were inserted in the premolar region of three Iranian dogs. Screws were divided into three groups: (1) the first group undergoing immediate orthodontic force of 300?cN, (2) the second group undergoing immediate orthopedic force of 600?cN and (3) a control group. Screws were explanted with adequate amount of surrounding bone after three months. Bone-screw contact (BSC), percentage of lamellar bone, and percentage of woven bone were evaluated. Wilcoxon and Man Whitney tests were used to analyze the data using SPSS software ver. 15 ( ). Results. There was no significant difference among the groups in terms of bone-screw contact ( ), percentage of lamellar bone ( ), and percentage of woven bone ( ). Conclusion. By applying orthodontic and orthopedic forces to mini-screws the quality of surrounding bone and osseointegration will not be affected. Clinical Significance. Application of force to mini-screws is helpful in orthodontic-screw therapies. 1. Introduction Nowadays, a larger number of patients are seeking orthodontic treatments to enhance their quality of life [1]. Since the introduction of orthodontic treatments, anchorage has been a challenge for clinicians [2]. Orthodontic anchorage is defined as resistance to unwanted tooth movement and many ways have been suggested to provide an appropriate anchorage [3]. Traditionally, a large group of teeth or intra- and extraauxiliary devices have been used [2] but some situations like missing teeth, periodontitis, and lack of patients compliance preclude the use of those common ways [4, 5]. For the first time in 1984, Roberts et al. recommended the use of screws as orthodontic anchorage. It was observed that titanium screws remained stable during orthodontic forces, concluding that the use of screws for orthodontic anchorage can be beneficial [4]. Dental screws have some shortcomings that hinder their use. These screws can be placed only in limited sites like retromolar and edentulous areas [6, 7]. Also they impose some troubles such as severity of surgery and long healing time, making them unacceptable for some patients [7]. Due to screws impediments in providing anchorage, miniscrews were introduced by Kanomi. Miniscrews are titanium screws with 1.2?mm diameter and 6.0?mm length [8]. After a while, miniscrews became popular because of their ease of insertion, low cost, and
Grid Resource Selection Optimization with Guarantee Quality of Service by Hybrid of Genetic and Simulated Annealing Algorithms
Hossein Shirgahi,Malihe Danesh,Najmeh Danesh
Lecture Notes in Engineering and Computer Science , 2010,
Prevalence of Mistreatment or Belittlement among Medical Students – A Cross Sectional Survey at a Private Medical School in Karachi, Pakistan
Sana Shoukat,Mariam Anis,Danesh K. Kella,Fahad Qazi,Fatima Samad,Faizia Mir,Maryah Mansoor,Mohammad B. Parvez,Bushra Osmani,Sukaina A. Panju,Haider Naqvi
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0013429
Abstract: Mistreatment or belittlement of medical students either by faculty or fellow students has often been reported. Perception of mistreatment has also been associated with increased degree of psychological morbidity. There is a lack of such studies being conducted amongst the medical students of Pakistan. The aim of this study was to determine the prevalence and forms of perceived mistreatment and presence of mental health morbidity in a private medical school in Pakistan. Also, any association between mental health morbidity and mistreatment was to be identified.
Performance Analysis of Parallel Non-Orthogonal Peec-Based Solver for Emc Applications
Danesh Daroui;Jonas Ekman
PIER B , 2012, DOI: 10.2528/PIERB12041008
Abstract: A parallel implementation of a quasi-static Partial Element Equivalent Circuit (PEEC)-based solver that can handle electromagnetic problems with non-orthogonal structures is presented in this paper. The solver has been written in C++ and employs GMM++ and ScaLAPACK computational libraries to make the solver fast, efficient, and adaptable to current parallel computer systems. The parallel PEEC-based solver has been tested and studied on high performance computing clusters and the correctness of the solver has been verified by doing comparisons between results from orthogonal routines and also another type of electromagnetic solver, namely FEKO. Two non-orthogonal numerical test cases have been analysed in the time and frequency domain. The results are given for solution time and memory consumption while bottlenecks are pointed out and discussed. The benchmarks show a good speedup which gets improved as the problem size is increased. With the capability of the presented solver, the non-orthogonal PEEC formulation is a viable tool for modelling geometrically complex problems.
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