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匹配条件: “Adel Ahmadzadeh” ,找到相关结果约1098条。
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The Optimization of Running Queries in Relational Databases Using ANT-Colony Algorithm
Adel Alinezhad Kolaei,Marzieh Ahmadzadeh
Computer Science , 2013,
Abstract: The issue of optimizing queries is a cost-sensitive process and with respect to the number of associated tables in a query, its number of permutations grows exponentially. On one hand, in comparison with other operators in relational database, join operator is the most difficult and complicated one in terms of optimization for reducing its runtime. Accordingly, various algorithms have so far been proposed to solve this problem. On the other hand, the success of any database management system (DBMS) means exploiting the query model. In the current paper, the heuristic ant algorithm has been proposed to solve this problem and improve the runtime of join operation. Experiments and observed results reveal the efficiency of this algorithm compared to its similar algorithms.
Performance of fluoride adsorption by snail shell in aqueous
Ghorban Asgari,AbdolMotaleb Seid Mohammadi,Jamal Mehralipour,Adel Ahmadzadeh
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Fluoride in low concentration is essential for human but in high concentration is very hazardous for human health. The efficacy of Snail Shell (SS) was investigated in this research work as an adsorbent for the elimination of fluoride from aqueous.Material and Methods: In this experimental study, the capability of SS to adsorb fluoride ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of Fluoride and with the preferred level of pH was shacked. The effects of selected parameters such as pH (3-11), reaction time (5–60 min) cyanide concentrations (5–10 mg/L) and the adsorbent dosage (0.25–2.5 g/L) were investigated on the removal fluoride as a target contaminate. Chemical composition SS were analyzed using a Philips model XL-30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The concentration of Fluoride in solution before and after treatment was determined using the HACH method.Results: Analysis of the SS component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, aluminum and silicate. The experimental data showed that the maximum fluoride removal occurred at pH of 7, adsorbent dose (0.5 g/L) and 30 min contact time and 5 mg/lit initial concentration. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorption process. The equilibrium adsorption of fluoride onto SS was well represented by the Langmuir equation.Conclusion: As a result, SS was revealed as a very efficient and low-cost adsorbent and a promising option for removing fluoride from industrial wastewaters.
Goldenhar Syndrome
Arash Ahmadzadeh,Ali Ahmadzadeh
Jundishapur Scientific Medical Journal , 2012,
Abstract: Goldenhar syndrome (GS) or Oculo-Auriculo-Vertebral Syndrome is a rare disease characterized by craniofacial anomalies such as hypoplasia of the mandible and malar bone, microtia, and vertebral anomalies. GS is an etiologically heterogeneous disorder that may have a genetic basis in some cases. Here, a 3-month-old girl with GS is reported. She was brought for routine check-up. On physical examination, the unusual features were facial asymmetry, unilateral macrostomia, a preauricular tag low set ear, atresia of external ear canal and an epibulbar dermoid cyst at the left side. Brain-stem evoked response audiometry showed severe-profound conductive hearing loss on the left side. She has an older brother with the same problems. Congenital malformations in patient with GS are unilateral. Early detection and treatment of hearing loss is very important in the development of the patient.
Analyticity of Semigroups generated by Degenerate Mixed Differential Operators  [PDF]
Adel Saddi
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.13010
Abstract: In this paper we are interested in studying the dissipativity of degenerate mixed differential operators involving an interface point. We show that, under particular interface conditions, such operators generate analytic semigroups on an appropriate Hilbert space . To illustrate the results an example is discussed.
Mild Solutions of Fractional Semilinear Integro-Differential Equations on an Unbounded Interval  [PDF]
Adel Jawahdou
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.47A007
Abstract: In this paper, we study the existence of mild solutions for fractional semilinear integro-differential equations in an arbitrary Banach space associated with operators generating compact semigroup on the Banach space. The arguments are based on the Schauder fixed point theorem.
A Decision Tree Classifier for Intrusion Detection Priority Tagging  [PDF]
Adel Ammar
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.34006
Abstract: Snort rule-checking is one of the most popular forms of Network Intrusion Detection Systems (NIDS). In this article, we show that Snort priorities of true positive traffic (real attacks) can be approximated in real-time, in the context of high speed networks, by a decision tree classifier, using the information of only three easily extracted features (protocol, source port, and destination port), with an accuracy of 99%. Snort issues alert priorities based on its own default set of attack classes (34 classes) that are used by the default set of rules it provides. But the decision tree model is able to predict the priorities without using this default classification. The obtained tagger can provide a useful complement to an anomaly detection intrusion detection system.
Comparison of Feature Reduction Techniques for the Binominal Classification of Network Traffic  [PDF]
Adel Ammar
Journal of Data Analysis and Information Processing (JDAIP) , 2015, DOI: 10.4236/jdaip.2015.32002
Abstract: This paper tests various scenarios of feature selection and feature reduction, with the objective of building a real-time anomaly-based intrusion detection system. These scenarios are evaluated on the realistic Kyoto 2006+ dataset. The influence of reducing the number of features on the classification performance and the execution time is measured for each scenario. The so-called HVS feature selection technique detailed in this paper reveals many advantages in terms of consistency, classification performance and execution time.
A Clinicopathological Study of Lupus Nephritis in Children
Ahmadzadeh Ali,Derakhshan Ali,Ahmadzadeh Azar
Saudi Journal of Kidney Diseases and Transplantation , 2008,
Abstract: To assess clinical characteristics, pathological findings, and therapeutic response in children with lupus nephritis (LN), we retrospectively studied 25 children under 16 years of age with LN at the Abozar children′s hospital from 1995 to 2006. The study included 13(65%) girls and 7(35%) boys. The mean age at the time of diagnosis of SLE was 10.2 (± 4.8) years. Eighteen patients (90%) were more than 8 years old. Sixty percent of the patients presented as nephritic-nephrotic syndrome. All the patients underwent percutaneous renal biopsy and were followed up for at least 36 months. The clinical and serologic parameters at the time of renal biopsy were recorded. Twenty patients were treated with the following regimens: one (class I) with low dose prednisone, 7 (class II, III) with high-dose of prednisone, 12 (class IV) with high-dose prednisone plus 13 intermittent intravenous cyclophosphamide (CTX) pulses (monthly for 6 months and then every 3 months), followed by mycophenolate mofetil (MMF) as maintenance therapy. Remission was achieved in 17 (85%) cases; one required hemodialysis and 2 died due to renal failure and central nervous system involvement. Among 12 cases with class IV, 11 responded to prednisone and intravenous CTX pulses. We conclude that i.v. pulses of CTX induced clinical remission of renal disease in the majority of children with severe LN. MMF maintenance therapy was effective after induction of remission in refractory cases. However, this study was performed in a small number of subjects, further studies to confirm the long-term efficacy and safety of CTX pulse therapy on larger numbers of patients are warranted.
Comparison of Retentive Force in Four Attachment Systems in Implant- Supported Overdenture of the Lower Arch
Ahmadzadeh A.,Fereidoonpoor N.
Journal of Dentistry , 2012,
Abstract: tement of Problem: Along with the rapid population growth in recent decades, there has been an increase in the number of edentulous patients who have complications with conventional denture. This entails the use of dentures, such as implant overdenture, which are more efficacious. Purpose: The purpose of this study is to compare four types of different attachm-ent systems; two prefabricated and two castable attachments. Materials and Method: A model of lower edentulous arch was constructed out of dental stone. Two parallel implants were placed in the canine region. A single cast metal chrome cobalt framework was fabricated to provide reinforcement for experimental overdentures and it splinted the two attachments on the cast. To conduct this study, four groups with six numbers of attachments in each group (superflex ball, locator, castable ball on bar, castable bar) were selected. All the samples were put in a Universal Testing Machine and a tension force with the speed of 50 mm/ min was exerted to separate the framework from the cast. The tension force was recorded and the first two prefabricated attachments (superflex ball and locator) were compared with the second two castable attachments (ball on bar, castable bar).Results: The findings of this study revealed that retention force of castable ball on bar was greater than the other three attachments (35.31±3.14N). With regard to the strength of retentive force, superflex ball took the second place (33.33± 3.11 N) and locator (20.90± 3.74N) and castable bar (14.74± 1.15N) took the third and the forth places, respectively ( p >0.001). Conclusion: The retentive force of castable ball on bar was similar to that of superflex ball. Therefore, the use of this cheap attachment; castable ball on bar, is preferred to its prefabricated counterparts. The retentive force of this kind of attachment is greater than expensive locators. The retentive force of castable bar was similar to that of locator, although the former was a bit weaker than the latter. Therefore, when less retention is needed, castable bar can be a suitable choice, and when more retention is needed, castable ball on bar is preferable.
ECG Signals Classification Based on Wavelet Transform and Probabilistic Neural Networks
Iman Moazen,Mohamadreza Ahmadzadeh
Majlesi Journal of Electrical Engineering , 2009, DOI: 10.1234/mjee.v3i3.245
Abstract: In this paper a very intelligent tool with low computational complexity is presented for Electroencephalogram (ECG) signal classification. The proposed classifier is based on Discrete Wavelet Transform (DWT) and Probabilistic Neural Network (PNN). The novelty of this approach is that signal statistics, morphological analysis and DWT of the histogram of signal (density estimation) altogether have been used to achieve a higher recognition rate. ECG signals and their density estimation are decomposed into sub-classes using DWT. A PNN is used to classify ECG signals using statistical discriminating features which are extracted from ECG and its sub-classes. Experimental results on five classes of ECG signals from MIT-BIH arrhythmia database show that the proposed method learns very fast, low computational complexity, and a very high performance compared to the previous methods.
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