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Search Results: 1 - 10 of 12908 matches for " Mohammad Abbaszadeh "
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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

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.

Bladder Tumor in Women with Microscopic Hematuria: An Iranian Experience and a Review of the Literature
Shahin Abbaszadeh,Saeed Taheri,Mohammad Hossein Nourbala
Advances in Urology , 2009, DOI: 10.1155/2009/231861
Abstract: Aim. In this study we report our experience with microhematuria and its relation with bladder tumors in Iranian women. Materials and Methods. Overall 249 women were evaluated. Microscopic hematuria was defined as three or more red blood cells per high-power field on at least two different occasions. Patients with a history of gross hematuria or coagulation disorders, having organic diseases, urinary stones, urinary tract infections, nephrological diseases, and local lesions such as urethral caruncle were excluded from the study population. Final diagnosis of malignant tumors was done with cystoscopy and biopsy specimen pathological assessment in all cases. Results. Age for the study population was 49.7±11.8 years. 95 (38%) of patients were identified during routine check up and presenting symptoms in other patients were frequency, dysuria, stress urge incontinence, urge incontinence, feeling of incomplete urine emptying, and flunk pain, respectively. Finally, 7 (2.8%) of study subjects were confirmed as having bladder tumors. One of tumor cases was diagnosed 24 months after initial assessments. Patients with bladder tumor were significantly older; more frequently had diverticulum in their bladder wall (<.05). Conclusion. Female microscopic hematuria is relevant and deserves evaluations, especially in elderly patients. Patients whose reason for microhematuria would not be diagnosed at the initial evaluations should be followed.
Nonlinear Multiple Model Predictive Control of Solution Polymerization of Methyl Methacrylate  [PDF]
Masoud Abbaszadeh
Intelligent Control and Automation (ICA) , 2011, DOI: 10.4236/ica.2011.23027
Abstract: A sequential linearized model based predictive controller is designed using the DMC algorithm to control the temperature of a batch MMA polymerization process. Using the mechanistic model of the polymerization, a parametric transfer function is derived to relate the reactor temperature to the power of the heaters. Then, a multiple model predictive control approach is taken in to track a desired temperature trajectory.The coefficients of the multiple transfer functions are calculated along the selected temperature trajectory by sequential linearization and the model is validated experimentally. The controller performance is studied on a small scale batch reactor.
Organizational Political Tactics in Universities
Bahareh Azizi Nejad,Mir Mohammad Seiied Abbaszadeh,Mohammad Hassani
Higher Education Studies , 2011, DOI: 10.5539/hes.v1n2p65
Abstract: The present research aimed to promote understanding of political tactics in organizations. Political behavior in nowadays-complex conditions is a process that the conflicts, contrasts and differences among interested groups are resolved. It means dialogue, attention to different goals in organizations, regarding the interest of different groups, attraction of staff cooperation, and acquisition of the worker’s support in management decisions, therefore technical and organizational wisdom are not sufficient. Managers along the development of organizations need to have political wisdom. In this study we surveyed political tactics perceptions of 1263 academic faculty members in West Azarbaijan State Universities. The research method was a descriptive-survey. Among these academic members, 376 individuals were chosen randomly as research sample. Questionnaire of ‘political tactics’ (r= 0.9) was used to collect data. The data were analyzed by using descriptive and inferential statistics as well as t-test, MANOVA, and Freidman test. Research findings showed that there were significant differences between academic degrees of the academic faculty members and political tactics used in the universities, whereas there was no any difference between gender of faculty members and political tactics. The survey revealed that the perceptions of political tactics among faculty members were different in West Azarbaijan State Universities; therefore, some practical suggestions are recommended.
Percutaneous Nephrostomy for Treatment of Posttransplant Ureteral Obstructions
Seyed Abulghasem Mostafa,Shahin Abbaszadeh,Saeed Taheri,Mohammad Hossein Nourbala
Urology Journal , 2008,
Abstract: Introduction: We report our experience with percutaneous management of urologic complications following kidney transplantation. Materials and Methods: Of 1402 consecutive kidney transplant recipients from living donors at our hospital, 21 required percutaneous nephrostomy (PCN) for the treatment of obstructive lymphocele (n = 11), urinary calculus (n = 8), and stricture of the ureterovesical junction anastomosis (n = 2). We had also 11 kidney recipients with urine leakage from the ureter who were treated only by indwelling ureteral catheter. Urinary complications were diagnosed based on the clinical symptoms, elevated serum creatinine levels, ultrasonography and renal scintigraphy. Patients with ureteral obstruction or urine leakage were compared with kidney recipients without urologic complications. Results: A mean decline of 3.1 ± 3.0 mg/dL (range, 0.1 to 10.7 mg/dL) in serum creatinine level was detected (P < .001) after PCN. All of the patients remained symptom free for a mean follow-up period of 34.2 ± 20.1 months (range, 3 to 81 months). Patient and graft survival rates were not different between the patients undergoing PCN and other kidney recipients. The only difference was the history of using antilymphocyte globulin which was significantly more frequent in the patients of the PCN group (P = .01). Conclusion: In our experience, PCN is a safe and effective method for the treatment of ureteral obstructions in kidney allograft recipients. This method provided long-term success with few recurrences and low morbidity and mortality rates.
Caring for people at the end of life: Iranian oncology nurses′ experiences
Iranmanesh Sedigheh,Abbaszadeh Abbas,Dargahi Helen,Cheraghi Mohammad
Indian Journal of Palliative Care , 2009,
Abstract: Aim: To explore the meaning of Iranian oncology nurses′ experiences of caring for people at the end of life. Materials and Methods: A phenomenological hermeneutic approach was applied. Fifteen nurses working in oncology units were interviewed in 2007 regarding their experiences of caring for people at the end of life. Results: Participants experienced caring for people at the end of life as sharing space and time to be lost within an organizational context. This main theme was divided into three subthemes including being attentive to the dying persons and their families, being cared for by the dying persons and their families, and being faced with barriers. Conclusion: The study suggests that the nurses′ success in caring for people at the end of life is reliant on their interpersonal caring relationship. Facilitating such relationship requires the establishment of palliative care unit, incorporation of palliative care into undergraduate nursing studies, and cultural preparation through public education.
Renal Transplantation from Deceased Donors in Iran
Abbaszadeh Shahin,Nourbala Mohammad,Taheri Saeed,Ashraf Alireza
Saudi Journal of Kidney Diseases and Transplantation , 2008,
Constrained Nonlinear Model Predictive Control of a Polymerization Process via Evolutionary Optimization  [PDF]
Masoud Abbaszadeh, Reza Solgi
Journal of Intelligent Learning Systems and Applications (JILSA) , 2014, DOI: 10.4236/jilsa.2014.61004

In this work, a nonlinear model predictive controller is developed for a batch polymerization process. The physical model of the process is parameterized along a desired trajectory resulting in a trajectory linearized piecewise model (a multiple linear model bank) and the parameters are identified for an experimental polymerization reactor. Then, a multiple model adaptive predictive controller is designed for thermal trajectory tracking of the MMA polymerization. The input control signal to the process is constrained by the maximum thermal power provided by the heaters. The constrained optimization in the model predictive controller is solved via genetic algorithms to minimize a DMC cost function in each sampling interval.

Common Prothrombotic Gene Mutations in Cerebral Venous Sinus Thrombosis in North-West of Iran  [PDF]
Elyar Sadeghi-Hokmabadi, Ebrahim Sakhinia, Mehdi Farhoudi, Somayyeh Hasaneh, Morteza Ghojazadeh, Mohammad Amin Farzi, Sasan Andalib, Masoumeh Nemati, Omid Abbaszadeh, Reza Rikhtegar, Reshad Mirnour
Neuroscience & Medicine (NM) , 2017, DOI: 10.4236/nm.2017.84009
Abstract: Objective: Cerebral venous sinus thrombosis (CVST) is a life-threatening cerebrovascular disease which has high prevalence and mortality rate in Iran. Thrombophilia caused by gene mutation is a common cause of CVST. The present study aimed at assessing the prevalence of thrombophilic gene mutations in Iranian CVST patients and then comparing it with normal population. Materials and methods: In a case-control study, polymerase chain reaction-restriction fragment length polymorphism (PCR_RFLP) and amplification-refractory mutation system (ARMS-PCR) were carried out to detect common thrombophilic mutations in 70 CVST patients. Next, it was compared with 82 sex- and age-matched healthy controls. Results: Factor-V-Leiden, Factor-V-Leiden HR2, Factor prothrombin II, MTHFR (667C/T) and MTHFR (1298A/C) prevalence were significantly high in cases of CVST as compared to the controls (P values: 0.012, 0.019, 0.007 and 0.036, respectively). However, there was no significant difference between the two groups in plasminogen activator inhibitor (PAI), angiotensin-converting enzyme (ACE), beta-fibrinogen (FGB), Factor VIII, Factor XIII, and tissue plasminogen activator (tPA) mutations. Conclusion: The findings of the present study suggest that Factor V-Leiden, Factor-V-Leiden HR2, prothrombin II (G20210A), and MTHFR (667C/T & 1298A/C) mutations are more frequent in CVST. Detection of these mutations may help clinicians to decide on the duration of treatment and referral to genetic counseling for valuable prevention.
Study of the Entrepreneurship in Universities as Learning Organization Based on Senge Model
Bahareh - Azizi Nejad,Mir Mohammad - Seiied Abbaszadeh,Mahmoud - Djavani,Iraj Bernousi
International Education Studies , 2012, DOI: 10.5539/ies.v5n1p67
Abstract: Learning organization and entrepreneurship are the most important issues that are focused on different themes in management. The purpose of present research was to study the relationship between learning organization elements and entrepreneurship among academic faculty members of the West Azarbaijan State Universities. The research method was descriptive-survey. Research instruments were two questionnaires. The first one, learning organization elements’ questionnaire, which was built by Park (2008), and the second survey questionnaire collected information on the entrepreneurship that was built by Kordnaiej et al. (2005). Both questionnaires validities were confirmed by Cronbach’s alpha. The research results indicated that there was a positive and significant relationship between personal mastery, mental models, shared vision, team learning, the systems thinking, and the entrepreneurship. Along with these findings, some key practical suggestions are proposed: Creating a learning atmosphere and a safe environment for creative scientific competition, considering the issues and their various applications in relationship with each other and systematically that causes a deep relationship between the university academic faculty members which leads to the entrepreneurship.
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