oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 6 )

2018 ( 27 )

2017 ( 30 )

2016 ( 22 )

Custom range...

Search Results: 1 - 10 of 4532 matches for " Amir Ahmadi "
All listed articles are free for downloading (OA Articles)
Page 1 /4532
Display every page Item
Is nonlinear model predictive control with fuzzy predictive model proper for managing the blood glucose level in typeI diabetes?  [PDF]
Maryam Ahmadi, Amir Homayoon Jafari
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.52010
Abstract: In recent decades, due to the increasing risk of diabetes, the measurement and control of the blood sugar is of great importance. In typeI diabetes, because of the lack of insulin secretion, the cells cannot absorb glucose, and thus have a low level of glucose. To control blood glucose, the insulin must be injected to the body. In fact, the injection must be in a completely controlled environment. If the level of the insulin exceeds the physiological limits, it may cause death. This paper presents an online approach to control the blood glucose level using a nonlinear model predictive control. This method, maintains the level of blood glucose concentration within a normal range. Thus, the blood glucose level is measured in each minute and predicted for the next time interval. If that is not in the normal range, amount of the insulin which must be injected will be determined. The proposed control approach includes important features such as model uncertainties and prevents acute decrease in the blood glucose level, and instability. In order to assess performance of the proposed controller, computer simulations have been carried out in Matlab/Simulink. Simulation results will reveal the effectiveness of the proposed nonlinear model predictive controller in adjusting the blood glucose level by injecting required insulin. So if the nutrition of the person decreases instantly, the hypoglycemia does not happen.
Supervisory and Brothers Permission for Sister’s Matrimony in Islamic Religions
Amir Ahmadi
International Journal of Academic Research in Business and Social Sciences , 2012,
Abstract: Marriage is an important factor is Islam and is a complement for religion and humans personality that’s why girl have to marry by her caretakers permission that determined by mean of low and religion. In this have Supervisory and permission in his sister’s matrimony? Some religions say yes absolutely, some religions say no absolutely and some else religions believe authority in Supervisory of sisters matrimony. Now by investigate of this research, five religions ideas about this topic is interesting for you.
On the Difficulty of Deciding Asymptotic Stability of Cubic Homogeneous Vector Fields
Amir Ali Ahmadi
Mathematics , 2011,
Abstract: It is well-known that asymptotic stability (AS) of homogeneous polynomial vector fields of degree one (i.e., linear systems) can be decided in polynomial time e.g. by searching for a quadratic Lyapunov function. Since homogeneous vector fields of even degree can never be AS, the next interesting degree to consider is equal to three. In this paper, we prove that deciding AS of homogeneous cubic vector fields is strongly NP-hard and pose the question of determining whether it is even decidable. As a byproduct of the reduction that establishes our NP-hardness result, we obtain a Lyapunov-inspired technique for proving positivity of forms. We also show that for asymptotically stable homogeneous cubic vector fields in as few as two variables, the minimum degree of a polynomial Lyapunov function can be arbitrarily large. Finally, we show that there is no monotonicity in the degree of polynomial Lyapunov functions that prove AS; i.e., a homogeneous cubic vector field with no homogeneous polynomial Lyapunov function of some degree $d$ can very well have a homogeneous polynomial Lyapunov function of degree less than $d$.
Algebraic Relaxations and Hardness Results in Polynomial Optimization and Lyapunov Analysis
Amir Ali Ahmadi
Mathematics , 2012,
Abstract: This thesis settles a number of questions related to computational complexity and algebraic, semidefinite programming based relaxations in optimization and control.
Evaluation of Neonatal Hyperbilirubinemia at Mazandaran Province of Iran in 2004-2007: Prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency
Amir Hossein Ahmadi,Zeynab Ghazizadeh
Research Journal of Biological Sciences , 2012,
Abstract: The purpose of this study is to evaluate the etiology of hyperbilirubinemia and the Prevalence of Glucose-6-phosphate Dehydrogenase (G6PD) deficiency in newborns who were admitted to Boali Hospital in Sari City during the period, 2004-2007. This prospective descriptive study has been conducted on 1018 icteric newborns. The dataset included: age, sex, total and direct bilirubin, hemoglobin, hematocryte, reticulocyte count, direct Coombs, G6PD level and the type of treatment. All data was analyzed by using statistical method. The prevalence of sepsis, ABO incompatibility, G6PD deficiency and Undetermined (Exaggerated physiological jaundice, prematurity, breast feeding jaundice, unknown) was 2.7% (27 neonates), 2.9% (30 neonates), 13.6% (138 neonates) and 80.1% (815 neonates), respectively. Those with severe jaundice and hyperbilirubinemia were hospitalized and treated with phototherapy or exchange transfusion. Despite a high prevalence of G6PD deficiency in our study, we recommend that G6PD deficiency tests be performed in all Iranian and Mediterranean icteric newborns.
Evaluation of Glucose-6-Phosphate Dehydrogenase Deficiency Without Hemolysis in Icteric Newborns at Mazandaran Province, Iran
Amir Hossein Ahmadi,Zeynab Ghazizadeh
Pakistan Journal of Biological Sciences , 2008,
Abstract: This study was carried out with the aim of evaluating the prevalence of G6PD deficiency, the prevalence of hemolysis with enzyme deficiency and determining the severity of icterus in the hospitalized newborns in our hospital. This prospective descriptive study has been conducted on 1018 icteric newborns admitted to the Bo-Ali Hospital from 2004 to 2007. The dataset included: age, sex, total and direct bilirubin, hemoglobin, reticulocyte count, blood group and Rh of mother and newborn, direct Coombs, G6PD level and the type of treatment. All data was analyzed by using statistical method. From 1018 neonates, 138 neonates (13.6%) were found to have G6PD deficiency. The male to female ratio was 3 to 1 (104 male and 34 female neonates). From 138 neonates with G6PD deficiency, hemolysis was seen in 15 neonates (10.9%) and the rate of G6PD deficiency with hemolysis was 1.6%. Out of 138 patients with G6PD deficiency, 2 patients (0.2%) had blood exchange transfusion. In this study the prevalence of G6PD deficiency in icteric newborns was considerably high and most of them were non hemolytic, so we recommend G6PD test as a screening program for every newborn at the time of delivery.
Evaluation of Neonatal Hyperbilirubinemia at Mazandaran Province of Iran in 2004-2007: Prevalence of Glucose-6-Phosphate Dehydrogenase Deficiency
Amir Hossein Ahmadi,Zeynab Ghazizadeh
Research Journal of Biological Sciences , 2008,
Abstract: The purpose of this study is to evaluate the etiology of hyperbilirubinemia and the Prevalence of Glucose-6-phosphate Dehydrogenase (G6PD) deficiency in newborns who were admitted to Boali Hospital in Sari City during the period, 2004-2007. This prospective descriptive study has been conducted on 1018 icteric newborns. The dataset included: age, sex, total and direct bilirubin, hemoglobin, hematocryte, reticulocyte count, direct Coombs, G6PD level and the type of treatment. All data was analyzed by using statistical method. The prevalence of sepsis, ABO incompatibility, G6PD deficiency and Undetermined (Exaggerated physiological jaundice, prematurity, breast feeding jaundice, unknown) was 2.7% (27 neonates), 2.9% (30 neonates), 13.6% (138 neonates) and 80.1% (815 neonates), respectively. Those with severe jaundice and hyperbilirubinemia were hospitalized and treated with phototherapy or exchange transfusion. Despite a high prevalence of G6PD deficiency in our study, we recommend that G6PD deficiency tests be performed in all Iranian and Mediterranean icteric newborns.
Sum of Squares Basis Pursuit with Linear and Second Order Cone Programming
Amir Ali Ahmadi,Georgina Hall
Mathematics , 2015,
Abstract: We devise a scheme for solving an iterative sequence of linear programs (LPs) or second order cone programs (SOCPs) to approximate the optimal value of semidefinite and sum of squares (SOS) programs. The first LP and SOCP-based bounds in the sequence come from the recent work of Ahmadi and Majumdar on diagonally dominant sum of squares (DSOS) and scaled diagonally dominant sum of squares (SDSOS) polynomials. We then iteratively improve on these bounds by pursuing better bases in which more relevant SOS polynomials admit a DSOS or SDSOS representation. Different interpretations of the procedure from primal and dual perspectives are given. While the approach is applicable to semidefinite relaxations of general polynomial programs, we apply it to two problems of discrete optimization: the maximum independent set problem and the partition problem. We further show that some completely trivial instances of the partition problem lead to strictly positive polynomials on the boundary of the sum of squares cone and hence make the SOS relaxation fail.
DC Decomposition of Nonconvex Polynomials with Algebraic Techniques
Amir Ali Ahmadi,Georgina Hall
Mathematics , 2015,
Abstract: We consider the problem of decomposing a multivariate polynomial as the difference of two convex polynomials. We introduce algebraic techniques which reduce this task to linear, second order cone, and semidefinite programming. This allows us to optimize over subsets of valid difference of convex decompositions (dcds) and find ones that speed up the convex-concave procedure (CCP). We prove, however, that optimizing over the entire set of dcds is NP-hard.
Some Applications of Polynomial Optimization in Operations Research and Real-Time Decision Making
Amir Ali Ahmadi,Anirudha Majumdar
Mathematics , 2015,
Abstract: We demonstrate applications of algebraic techniques that optimize and certify polynomial inequalities to problems of interest in the operations research and transportation engineering communities. Three problems are considered: (i) wireless coverage of targeted geographical regions with guaranteed signal quality and minimum transmission power, (ii) computing real-time certificates of collision avoidance for a simple model of an unmanned vehicle (UV) navigating through a cluttered environment, and (iii) designing a nonlinear hovering controller for a quadrotor UV, which has recently been used for load transportation. On our smaller-scale applications, we apply the sum of squares (SOS) relaxation and solve the underlying problems with semidefinite programming. On the larger-scale or real-time applications, we use our recently introduced "SDSOS Optimization" techniques which result in second order cone programs. To the best of our knowledge, this is the first study of real-time applications of sum of squares techniques in optimization and control. No knowledge in dynamics and control is assumed from the reader.
Page 1 /4532
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.