Showing papers by "Islamic Azad University published in 2008"
TL;DR: The non-fasting ApoB/ApoA1 ratio was superior to any of the cholesterol ratios for estimation of the risk of acute myocardial infarction in all ethnic groups, in both sexes, and at all ages, and it should be introduced into worldwide clinical practice.
739 citations
TL;DR: The desirability function was used to evaluate all the factors and response in the biosorption experiments in order to find an optimum point where the desired conditions could be obtained and may have application as biosorbent for heavy metal removal from wastewater effluents.
385 citations
TL;DR: It is demonstrated in this paper that GA is an efficient method for solving a redundancy allocation problem for the series-parallel system when the redundancy strategy can be chosen for individual subsystems.
275 citations
TL;DR: Efficiency of carbon to remove the cations from real wastewater produced by copper industries was studied and showed that not only these cations can be removed considerably by the carbon sources, but also removing efficiency are much more in the real samples.
274 citations
TL;DR: In this paper, a critical examination was made on the reliability of kinetic parameters of nonisothermal thermoanalytical rate measurement by the widely applied Coats-Redfern(CR) equation.
265 citations
26 Oct 2008
TL;DR: This paper presents a taxonomy of intrusion detection systems that is then used to survey and classify them, and consists of the detection principle, and second of certain operational aspects of the intrusion detection system.
Abstract: The rapid proliferation of computer networks has changed the prospect of network security. An easy accessibility condition cause computer networkpsilas vulnerable against several threats from hackers. Threats to networks are numerous and potentially devastating. Up to the moment, researchers have developed Intrusion Detection Systems (IDS) capable of detecting attacks in several available environments. A boundlessness of methods for misuse detection as well as anomaly detection has been applied. Many of the technologies proposed are complementary to each other, since for different kind of environments some approaches perform better than others. This paper presents a taxonomy of intrusion detection systems that is then used to survey and classify them. The taxonomy consists of the detection principle, and second of certain operational aspects of the intrusion detection system.
242 citations
17 Dec 2008
TL;DR: A novel method to detect various posture-based events in a typical elderly monitoring application in a home surveillance scenario by combination of best-fit approximated ellipse around the human body, projection histograms of the segmented silhouette and temporal changes of head position is proposed.
Abstract: Video surveillance is an omnipresent topic when it comes to enhancing security and safety in the intelligent home environments. In this paper, we propose a novel method to detect various posture-based events in a typical elderly monitoring application in a home surveillance scenario. These events include normal daily life activities, abnormal behaviors and unusual events. Due to the fact that falling and its physical-psychological consequences in the elderly are a major health hazard, we monitor human activities with a particular interest to the problem of fall detection. Combination of best-fit approximated ellipse around the human body, projection histograms of the segmented silhouette and temporal changes of head position, would provide a useful cue for detection of different behaviors. Extracted feature vectors are fed to a MLP neural network for precise classification of motions and determination of fall event. Reliable recognition rate of experimental results underlines satisfactory performance of our system.
217 citations
TL;DR: In this article, the authors study the tunneling process through the quantum horizon of a Schwarzschild black hole in non-commutative spacetime, by considering the effect of smearing of the particle mass as a Gaussian profile in flat spacetime.
Abstract: We study the tunneling process through the quantum horizon of a Schwarzschild black hole in noncommutative spacetime. This is done by considering the effect of smearing of the particle mass as a Gaussian profile in flat spacetime. We show that even in this noncommutative setup there will be no correlation between the different modes of radiation, which reflects the fact that information does not come out continuously during the evaporation process at least at late time. However, due to spacetime noncommutativity, information might be preserved by a stable black hole remnant.
194 citations
TL;DR: In this paper, the homotopy analysis method (HAM) is applied to obtain the approximate solution of the nonlinear model of diffusion and reaction in catalyst pellets for the case of nth-order reactions.
190 citations
TL;DR: Findings show that the types of sacrificial electrodes are not very significant in the removal of 4-NP and the best results obtained when steel 310 and Fe are used as anode and employing Al and graphite as anodes would not be satisfactory.
183 citations
TL;DR: An extensive study of Fischer-Tropsch synthesis on carbon nanotubes (CNT) supported and γ-alumina-supported cobalt catalysts with different amounts of cobalt is reported in this paper.
TL;DR: A new approach to DFR at the distribution networks considering DGs is presented, which applies the particle swarm optimization (PSO) approach to solve the DFR, which is a nonlinear optimization problem.
TL;DR: An integrated approach of multi-attribute utility theory (MAUT) and linear programming (LP) is proposed for rating and choosing the best suppliers and defining the optimum order quantities among selected ones in order to maximize total additive utility.
Abstract: Supplier selection is a complex multi-criteria problem including both quantitative and qualitative factors. In order to select the best suppliers it is necessary to make a trade-off between these factors, some of which may be in conflict and may also be uncertain. In this problem if suppliers have capacity or other different constraints, two problems will exist: which suppliers are best and how much should be purchased from each selected supplier. In this paper an integrated approach of multi-attribute utility theory (MAUT) and linear programming (LP) is proposed for rating and choosing the best suppliers and defining the optimum order quantities among selected ones in order to maximize total additive utility. A numerical example is proposed to illustrate an application of the proposed method.
TL;DR: The three-component one-pot synthesis of 2-amino-5-oxo-dihydropyrano[3,2-c ]chromene derivatives by condensing 4-hydroxycoumarin, aldehydes and alkylnitriles using a catalytic amount of H 6 P 2 W 18 O 62 ǫ 18 H 2 O in aqueous ethanol under heating conditions is reported in this article.
TL;DR: A particle swarm optimization (PSO) based multi-stage fuzzy (PSOMSF) controller is proposed for solution of the load frequency control (LFC) problem in a restructured power system that operate under deregulation based on the bilateral policy scheme.
Journal Article•
TL;DR: There was a remarkable difference between the results of this active hospital-based study and the estimated cancer incidence for Iran by Globocan 2000, and ethnic, racial and environmental factors may explain these differences.
Abstract: Background: Cancer is a significant health problem in the developing countries, and one that is likely to increase in future. Due to unavailability of data concerning cancer during the last 15 years in our area and young age structure of our country, this active hospital-based study was undertaken to determine the occurrence of cancer in Fars Province, southern Iran. Methods: Data including face-to-face interview with patients and a survey of their medical and demographic records in relation to all invasive cancers were actively collected from 1990 to 2005 from four university hospitals. Among 2993 cases of registered malignant neoplasms presented by site and sex, the crude incidence (CRs), and age-specific incidence and age-standardized incidence rates (ASRs) per 100,000 were determined, using the world standard population. Results: Over a 5-year period, 1495 and 1620 cancer cases were registered in males and females, respectively, while breast cancer was at the top of 10 cancers in both sexes. Conclusion: With regard to the top 10 types of cancer, there was a remarkable difference between the results of our study and the estimated cancer incidence for Iran by Globocan 2000. Ethnic, racial and environmental factors may explain these differences but more studies in a longer time span are needed to clarify the causes.
TL;DR: A comprehensive parametric study has been carried out to understand the effects of various dimensional parameters and to optimize the performance of the designed antenna, which exhibits stable far-field radiation characteristics in the entire operating bandwidth, relatively high gain, and low cross polarization.
Abstract: The design and analysis of a novel printed wide-slot antenna, fed by a microstrip line, for wideband communication systems is presented. Detailed simulation and experimental investigations are conducted to understand its behavior and optimize for broadband operation. The designed antenna has a wide operating bandwidth of over 120% (2.8-11.4 GHz) for S11 <-10 dB. In addition to being small in size, the antenna exhibits stable far-field radiation characteristics in the entire operating bandwidth, relatively high gain, and low cross polarization. By properly choosing the suitable slot shape, selecting similar feed shape and tuning their dimensions, the design with very wide operating bandwidth, relatively small size and improved radiation pattern is obtained. A comprehensive parametric study has been carried out to understand the effects of various dimensional parameters and to optimize the performance of the designed antenna. Results show that the impedance matching of this kind of antenna is greatly affected by the feed-slot combination and feed gap width, with the slot shape being a main contributor of the radiation characteristics. The simulated and measured Results for return loss, far-field E and H-plane radiation patterns, and gain of designed antenna are presented and discussed.
TL;DR: In this article, the degradation of Congo red in laboratory solution was investigated, which had the chemical properties of the rinse waters of textile manufacturing dye-houses and the samples with Congo red alone wastewater by ozonation and to optimize the reaction parameters such as pH and time which influence the efficiencies of total organic carbon, total kjeldahl nitrogen and chemical oxygen demand removal.
Abstract: Congo red, which has a complex molecular structure with various diazo aromatic groups, is widely used in textile industry as an anionic dye. The purpose of this study was to investigate the degradation of Congo red in laboratory solution which had the chemical properties of the rinse waters of textile manufacturing dye-houses and the samples with Congo red alone wastewater by ozonation and to optimize the reaction parameters such as pH and time which influence the efficiencies of total organic carbon, total kjeldahl nitrogen and chemical oxygen demand removal. Ozonation of Congo red dye were carried out in a semi-batch reactor with constant ozone flow rate and concentration of 23 mL/sec and 13.6 mg/L, respectively. Decolorization was complete within a few minutes of ozonation possibly due to the cleavage of chromophore groups. It was observed that its structural destruction occurs predominantly at higher pHs. The reduction of chemical oxygen demand and destruction of the dye was more than 60 % and 42 %, respectively. Total kjeldahl nitrogen removal was accompanied by slight changes in nitrogen oxides. It can be deduced from the experimental results that: (a) the mineralization is very weak; (b) the reaction follows the indirect mechanism; i.e., the interaction of hydroxyl radicals with the dye and (c) the nitrification is rather predominant. Biological oxygen demand is declined in simulated alkalic and neutral samples respectively. At 13.6 mg O 3 /L, the biological oxygen demand levels were significantly enhanced. This might be attributable to the enhancement of its biodegradation at alkaline pHs.
TL;DR: In this article, an analytic technique, the homotopy analysis method (HAM), is applied to obtain the soliton solution of the Fitzhugh-Nagumo equation.
TL;DR: Novel centralized algorithms to solve the bandwidth-delay-constrained least-cost multicast routing problem based on the harmony search (HS) algorithm are presented and simulation results indicate that HSNPI algorithm has overcome other three algorithms on a variety of random generated networks considering average tree cost.
TL;DR: In this article, the effect of silica nanoparticles on the gas separation properties of ethylene vinyl acetate (EVA) copolymer containing 28% Vinyl acetate has been investigated.
TL;DR: Studying the role of young adults' parental attachment in terror management revealed that activating thoughts of one's parent in response to mortality salience reduced death-thought accessibility and worldview defense and increased feelings of self-worth, whereas secure individuals were more likely to rely on relationships with romantic partners.
Abstract: Six studies examined the role of young adults' parental attachment in terror management. Studies 1-3 revealed that activating thoughts of one's parent in response to mortality salience (MS) reduced death-thought accessibility and worldview defense and increased feelings of self-worth. Studies 4-5 demonstrated that MS led to greater ease of recalling positive maternal interactions and greater difficulty recalling negative interactions, and increased attraction to a stranger who was described as being similar to one's parent. If reliance on parents for terror management purposes reflects the operation of attachment mechanisms, then such effects should vary on the basis of an individual's attachment style. Study 6 demonstrated that, after MS, insecure individuals were more likely to rely on relationships with their parents, whereas secure individuals were more likely to rely on relationships with romantic partners.
TL;DR: In this paper, the decolorization and degradation of Rhodamine B (RB) were investigated using UV radiation in the presence of H2O2 in a batch photoreactor at different light intensities.
TL;DR: In this paper, a neural network model was proposed to predict the effects of operational parameters on the organic and inorganic sulfur removal from coal by sodium butoxide, which achieved quite satisfactory correlations of R 2 ǫ = 1 and 0.96 in training and testing stages for pyritic sulfur.
TL;DR: In this article, two new designs of wind towers were tested side by side with a conventional wind tower in the city of Yazd, Iran, and it was found that the wind tower with wetted column performs better with high wind speeds whereas the tower with wetted surfaces performs better in low wind speeds.
01 Jun 2008
TL;DR: The proposed cellular structure allows a better exploitation of local neighborhoods before they move towards the global best, hence it increases population diversity and shows that MOA in some benchmark functions can work better than GA and PSO.
Abstract: A novel optimization algorithm is proposed here that is inspired by the principles of magnetic field theory. In the proposed Magnetic Optimization Algorithm (MOA) the possible solutions are magnetic particles scattered in the search space. Each magnetic particle has a measure of mass and magnetic field according to its fitness. The fitter magnetic particles are those with higher magnetic field and higher mass. These particles are located in a lattice-like environment and apply a force of attraction to their neighbors. The proposed cellular structure allows a better exploitation of local neighborhoods before they move towards the global best, hence it increases population diversity. Experimental results on 14 numerical benchmark functions show that MOA in some benchmark functions can work better than GA and PSO.
TL;DR: Although administration of the Probiotic PrimaLac appeared to improve the antibody responses to Newcastle disease virus and infectious bursal disease vaccination, the antibody titres of the probiotic-treated group were not significantly different from those not receiving probiotics.
Abstract: The effects of the probiotic PrimaLac (Lactobacillus acidophilus, Lactobacillus casei, Enterococcus faecium and Bifidobacterium bifidium) was investigated on performance and immune responses to vaccination against Newcastle disease and infectious bursal disease in broiler chickens. Use of PrimaLac significantly (P<0.05) enhanced broiler performance by improving body weight and decreasing the feed conversion ratio. Although administration of the probiotic appeared to improve the antibody responses to Newcastle disease virus and infectious bursal disease vaccination, the antibody titres of the probiotic-treated group were not significantly different from those not receiving probiotics.
TL;DR: The procedure was applied to the determination of analytes in natural waters, soil, and blood samples with satisfactory results (recoveries greater than 95%, R.S.D.'s lower than 4%).
TL;DR: The results showed that chamomile is able to maintain all its medical properties, under saline condition and could be cultivated economically in such conditions.
TL;DR: In this article, the effect of autocorrelation between profiles is investigated using average run length (ARL) criterion and three methods based on time series approach are used to eliminate the effect.
Abstract: Control charts are commonly used to monitor quality of a process or product characterized by a quality characteristic or a vector of quality characteristics. However, in many practical situations the quality of a process or product can be characterized by a function or profile. Here we consider a linear function and investigate the violation of common independence assumption implicitly considered in most control charting applications. We specifically consider the case when profiles are not independent from each other over time. In this article, the effect of autocorrelation between profiles is investigated using average run length (ARL) criterion. Simulation results indicate significant impact on the ARL values when autocorrelation is overlooked. In addition, three methods based on time series approach are used to eliminate the effect of autocorrelation. Their performances are compared using ARL criterion.