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Stroboscopic findings in patients with benign laryngeal lesions: a brief report
P Dabirmoghadam,S Azimian,Z Mokhtari
Tehran University Medical Journal , 2012,
Abstract: Background: Laryngeal videostroboscopy is an important noninvasive diagnostic tool in patients with dysphonia. More than 50% of patients with dysphonia have a benign laryngeal lesion on vocal fold examination. The aim of this study was to evaluate patients with benign laryngeal lesions by videostroboscopy.Methods: This cross-sectional study was done on 159 patients with dysphonia in Amiralam Hospital in Tehran, Iran during 2006-2007. All the patients underwent stroboscopic examination of the vocal folds, including their movement. We also evaluated the patients for mucosal status, mucosal wave and patterns of glottal closure.Results: Eighty-two patients participating in the study were female and 77 were male. Reflux laryngitis and muscle tension dysphonia were the most observed disorders in the patient population. Patients with sulcus vocalis and intracordal cysts had the worst mucosal wave patterns.Conclusion: Laryngeal videostroboscopy is a useful tool for the diagnosis and treatment planning in patients with benign laryngeal lesions.
Provable Partial Key Escrow
Kooshiar Azimian,Javad Mohajeri,Mahmoud Salmasizadeh,Samuel S. Wagstaff, Jr.
International Journal of Network Security , 2010,
Abstract: In this paper we first propose two new concepts concerning the notion of key escrow schemes: provable partiality and independence. Roughly speaking, a scheme has provable partiality if the existence of a polynomial time for recovering the secret from escrowed information implies there is a polynomial time algorithm for solving a well known intractable problem. A scheme is independent if the secret key and the escrowed information are independent. Finally, we propose a new verifiable partial key escrow scheme, based on McCurley's encryption scheme, satisfying both of the above criteria.
LDA Study of Particulate Flow in a Channel with Deformed Surface Locations and with Flow Conditioner  [PDF]
Mehdi Azimian, Hans-J?rg Bart
Open Journal of Fluid Dynamics (OJFD) , 2015, DOI: 10.4236/ojfd.2015.54035
Abstract: Hydroabrasion in particulate flows plays an important role in various industrial and natural processes. To predict the effects of particulate flow and the resulting phenomena such as erosion/abrasion in a pipeline, channel or a fitting, it is essential to characterize the effects in a simple standardized geometry. For this purpose, it is vital to initially understand the particulate flow behavior and motion in such geometries. In the present work, two series of experimental works by application of the LDA measurement technique were successfully conducted. First, the particulate flow behavior at downstream of a flow conditioner inside a channel with square cross-section was investigated. Shorter lengths for fully development of velocity profile by using the self-constructed flow conditioner were observed. Moreover, the flow at downstream of the conditioner was modeled with the CFD tool (ANSYS-CFX V. 14.57) and the simulation results were compared and validated by the LDA experimental data. Better agreement between the simulation results and experimental data was observed in the fully developed region. However, there are some deviations due to the actual pressure loss through the experimental loop and the calculated pressure loss value, which includes some assumptions for the loss coefficients. Furthermore, the particulate flow behavior and vortex generation inside the deformed locations of a channel surface were studied in detail. With the help of the Matlab program, it was possible to calculate and visualize the velocity vectors for each measured point inside the channel accurately.
Effects of Dietary Chromium-Methionin Supplementation on Blood Metabolites and Insulin Resistance Index in Fructose-Fed Diabetic Rats
S.E. Ghiasi,R. Valizadeh,R. Rajabian,R. Jalal,B. Azimian
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.2284.2289
Abstract: The aim of this study was to evaluate the effect of chromium-methionin supplementation in high dosage on blood parameters and Insulin Resistance (IR) index in fructose induced insulin resistant rats. At first stage of the experiment, ten wistar rats were assigned as the healthy control group and sixteen rats were given Fructose (Fr) for 5 weeks in order to inducing insulin resistance. In the 2nd stage the insulin resistant rats were divided into Cr-fed group that additionally fed 1000 μg day-1 chromium as Chromium-L-Mmethionin (Cr-Met) and insulin resistant rats with no chromium supplementation for 6 weeks. In the first stage, IR was significantly induced (p<0.05) in rats receiving Fr. Plasma Fasting glucose, insulin, IR index and triglyceride contents were significantly (p<0.05) increased in Fr-fed group in comparison with the control. According to the results of second stage, IR index significantly (p<0.05) decreased after Cr-Met supplementation. The fasting insulin, glucose and triglycerides concentrations in Cr-Met treated group were lower (p<0.05) than the Fr-fed insulin resistant group. The results of this study indicated that chromium supplementation as Cr-Met could be effective for lowering IR index, fasting insulin, glucose and triglyceride in insulin resistant rats.
A Qualitative Assessment of Urban Family Planning Facilities Hamadan, May – September 2003
A Shahidzadeh,E.S Mir Moeeni,M.H Azimian,KH Mani-Kashani
Journal of School of Public Health and Institute of Public Health Research , 2004,
Abstract: This cross-sectional study was conducted from May to September 2003, with the aim of determining quality of service in 25 State-run family planning clinics in Hamadan city. A total of 400 consultations were observed and assessed using UNICEF quality checklists. Results showed that less than 50% of the clients are receiving service of a satisfactory quality; areas of care where quality was worst included history taking, physical examination and counseling. It became apparent that care providers with higher education had lower performance levels compared to their less educated colleagues. Service for new clients was of poorer quality than for those who had requested a change of contraceptive method. Furthermore, earlier hours of a work shift (before 10 o’clock) were associated with better service quality than later hours. Altogether, the study reveals serious flaws in areas such as training of family health workers and human resource management within the current system. To address these shortcomings, we recommend a more client-oriented approach in health care, use of supplementary material to promote client knowledge, and training of health workers with due emphasis on effective communication and performance.
Weak Composite Diffie-Hellman
Kooshiar Azimian,Javad Mohajeri,Mahmoud Salmasizadeh
International Journal of Network Security , 2008,
Abstract: In1985, Shmuley proposed a theorem about intractability of Composite Diffie-Hellman. The theorem of Shmuley may be paraphrased as saying that if there exist a probabilistic polynomial time oracle machine which solves the Diffie-Hellman modulo an RSA-number with odd-order bases then there exist a probabilistic algorithm which factors the modulo. In the other hand Shmuely proved the theorem only for odd-order bases and left the even-order case as an open problem. In this paper we show that the theorem is also true for even-order bases. Precisely speaking we prove that even if there exist a probabilistic polynomial time oracle machine which can solve the problem only for even-order bases still a probabilistic algorithm can be constructed which factors the modulo in polynomial time for more than 98% of RSA-numbers.
CFD simulation and experimental analysis of erosion in a slurry tank test rig
Azimian Mehdi,Bart Hans-J?rg
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134501009
Abstract: Erosion occurring in equipment dealing with liquid-solid mixtures such as pipeline parts, slurry pumps, liquid-solid stirred reactors and slurry mixers in various industrial applications results in operational failure and economic costs. A slurry erosion tank test rig is designed and was built to investigate the erosion rates of materials and the influencing parameters such as flow velocity and turbulence, flow angle, solid particle concentration, particles size distribution, hardness and target material properties on the material loss and erosion profiles. In the present study, a computational fluid dynamics (CFD) tool is used to simulate the erosion rate of sample plates in the liquid-solid slurry mixture in a cylindrical tank. The predictions were made in a steady state and also transient manner, applying the flow at the room temperature and using water and sand as liquid and solid phases, respectively. The multiple reference frame method (MRF) is applied to simulate the flow behavior and liquid-solid interactions in the slurry tank test rig. The MRF method is used since it is less demanding than sliding mesh method (SM) and gives satisfactory results. The computational domain is divided into three regions: a rotational or MRF zone containing the mixer, a rotational zone (MRF) containing the erosion plates and a static zone (outer liquid zone). It is observed that changing the MRF zone diameter and height causes a very low impact on the results. The simulated results were obtained for two kinds of hard metals namely stainless steel and ST-50 under some various operating conditions and are found in good agreement with the experimental results.
Numerical Investigation of Particle Rebound Characteristics with Finite Element Method  [PDF]
Mehdi Azimian, Hans-J?rg Bart
Open Journal of Fluid Dynamics (OJFD) , 2017, DOI: 10.4236/ojfd.2017.73020
Abstract: In this work, investigation of particle rebound characteristics due to impact with surface of a target material is presented. The rebound of a spherical particle after impact on a planar surface was analyzed in detail. Specifically, the coefficient of restitution of the particle under various impact conditions was investigated numerically. This study has been conducted by carrying out a series of FEM-based (finite element method) simulations using ANSYS Autodyn software. First, a summary about the state of the art and the theoretical models for the elastic collisions were reviewed. Afterwards, the impact of an aluminum oxide particle on an aluminum alloy target surface was modeled. Using the Autodyn tool, the results were compared and validated by the experimental results of Gorham and Kharaz [1]. Selection of an appropriate equation of state (EOS) and a strength model for each material had a strong effect on the results. For both materials, the Shock EOS was applied for the final simulations. As the strength model, the Johnson-Cook and the elastic model were used, respectively. The agreement of the obtained numerical results with the experimental data confirmed that the proposed model can precisely predict the real behavior of the particle after the impact, when the material models are properly chosen. Furthermore, the effects of impact velocity and impact angle on the rebound characteristics of the particle were analyzed in detail. It was found that the selection of the exact value of friction coefficient has a drastic effect on the prediction of restitution coefficient values, especially the tangential restitution coefficient.
Olfactory function following open rhinoplasty: A 6-month follow-up study
Hashem Shemshadi, Mojtaba Azimian, Mohammad Onsori, Mahdi AzizAbadi Farahani
BMC Ear, Nose and Throat Disorders , 2008, DOI: 10.1186/1472-6815-8-6
Abstract: In this cohort design, 40 of 65 esthetic open rhinoplasty candidates with equal gender distribution, who met the inclusion criteria, were assessed for their olfactory function using the Smell Identification Test (SIT) with 40 familiar odors in sniffing bottles. All the patients were evaluated for the SIT scores preoperatively and postoperatively (at week 1, week 6, and month 6).At postoperative week one, 87.5% of the patients had anosmia, and the rest exhibited at least moderate levels of hyposmia. The anosmia, which was the dominant pattern at postoperative week 1, resolved and converted to various levels of hyposmia, so that no one at postoperative week 6 showed any such complain. At postoperative week six, 85% of the subjects experienced degrees of hyposmia, almost all being mild to moderate. At postoperative six month, the olfactory function had already reverted to the preoperative levels: no anosmia or moderate to severe hyposmia. A repeated ANOVA was indicative of significant differences in the olfactory function at the different time points. According to our post hoc Benfronney, the preoperative scores had a significant difference with those at postoperative week 1, week 6, but not with the ones at month 6.Esthetic open rhinoplasty may be accompanied by some degrees of postoperative olfactory dysfunction. Patients need a time interval of 6 weeks to 6 months to fully recover their baseline olfactory function.Since the joy of foods and/or beverages is highly correlated with their odor, any degree of olfactory dysfunction negatively impacts one's sense of well-being and content [1,2]. Not only do olfactory impairments alter one's appetite, body weight, psychological well-being, and quality of life [3], but they also compromise one's safety when a certain odor should raise the alarm in such different cases as spoiled food, leaking natural gas, or airborne pollutants [4]. Indeed, during fire alarms, those with a more intact sense of smell can perceive danger earli
Determination of Facilitators and Barriers in Post Stroke Life, in Kerman City
Mahdieh Jafari,Asghar Makarem,Asghar Dalvandi,Mojtaba Azimian
Modern Rehabilitation , 2011,
Abstract: Background and Aim: Stroke is the third leading cause of death, second cause of long-term disability and one of the very important challenging in life. The aim of this research was to explain the barriers and facilitating factors affected on stroke patients life, and to identify relationship among them with demographic factors and severity of disease.Materials and methods: The descriptive-analytic technique was used. All patients who suffered from stroke were recruited in Kerman city. Finally 83 patients were selected, and data were gathered by demographic qualification questionnaire, proven questionnaire by researcher for studying barriers and facilitating factors (after testing validity and reliability), and NIHSS tools . Then, data were analyzed by using descriptive and referential statistics ANOVA test, T-Test, and Pearson coefficient correlation by SPSS software (ver. 16).Results: The findings showed that patients had more problems in the domains of politics, environmental factors, physical, and economic status. Also, they introduced social support from friends, family and prayer as facilitating factors in their lives. There was a significant positive relationship between age and physical and economical problems. Women have used social support and religious coping more than men. Married patients received more social support and their physical and economic problems raised less.Conclusion: Patients with higher severity of disease had more psychological problems such as depression and worry about future and Patients with lower socio-economic status more faced with barriers.
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