A Blind Watermarking Algorithm to Protect Digital Images Based on Remainder of Wavelet Coefficients

A Blind Watermarking Algorithm to Protect Digital Images Based on Remainder of Wavelet Coefficients

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Part of #A Blind Watermarking Algorithm to Protect Digital Images Based on Remainder of Wavelet Coefficients# :

Publishing year : 2013

Conference : 21st Iranian Conference on Electrical Engineering

Number of pages : 5

Abstract: In this work, a robust digital image watermarking algorithm is proposed using a wavelet transform domain. At the first step, the wavelet decomposition of host image into ten subbands isdone by the 3-level wavelet transform of Haar. Then, the wavelet coefficients in the HL3 sub-band are quantized. For embedding watermark bits, we select an F F coefficient matrix T from HL3 coefficients, as many as bits of the binary watermark image. Due to the blindness of the proposed watermarking algorithm, the method of watermarking does not require the original host image. The simulation results confirm that the proposed algorithm is sufficiently robust against common attacks, in particular JPEG attack, moreover, the method outperforms previous methods in Most situations

Investigation of kinetics of mass transfer parameters during deep fat frying of native gum coated potato chips

Investigation of kinetics of mass transfer parameters during deep fat frying of native gum coated potato chips

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Part of #Investigation of kinetics of mass transfer parameters during deep fat frying of native gum coated potato chips# :

Publishing year : 2012

Conference : The First Innovation Conference on Food Processing

Number of pages : 8

Abstract: The aim of this study was to evaluate the effect of two different coatings on mass transfer during deep-fat frying of potato strips. The effect of basil seed gum (BSG) and methylcellulose (MC) (1% w / w), frying temperature and time on mass transfer were determined. The least fat absorption was observed when samples were coated with BSG 1% fried at 190 C (0.14 d.b). The first order kinetics based on Fick's law was used to describe the phenomenon of moisture transfer. The effective moisture diffusivity ranged from 8.38 107 to 12.87 107 m2 / s. The rate of fat transfer constants was between 1.1 102 and 2.52 102 s1

An UWB LNA With Butterworth Filter in 0.18?m CMOS technology

An UWB LNA With Butterworth Filter in 0.18?m CMOS technology

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Part of #An UWB LNA With Butterworth Filter in 0.18?m CMOS technology# :

Publishing year : 2009

Conference : Twelfth Student Conference on Electrical Engineering

Number of pages : 5

Abstract: In this paper, a 3GHz-10GHz Ultra-wideband (UWB) Low Noise Amplifier (LNA) typology is proposed. The broadband matching and flat gain are two important factors for broadband circuits. In addition to these factors, the minimum noise figure (NF), good linearity, and lower power consumption are also required. The common gate input stage configuration is used in the proposed LNA to achieve broadband input matching. The flat gain of the LNA is achieved by the combination of the inductor peak load and the shunt inductor insertion between the cascade stages of the LNA. The LNA is designed in the standard 0.18m CMOS technology. The input reflection coefficient S11 and the output reflection coefficient S22 are less than -8dB and -10dB. It achieved maximum power gain of 14.8dB and the minimum noise figure is 3.6dB and S12 less than -42dB. It consumes 14.8mW from a 1.8-V supply voltage

Simulating and Experimental Investigation of the Permeability Reduction due to Asphaltene Deposition in Porous Media

Simulating and Experimental Investigation of the Permeability Reduction due to Asphaltene Deposition in Porous Media

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Part of #Simulating and Experimental Investigation of the Permeability Reduction due to Asphaltene Deposition in Porous Media# :

Publishing year : 2009

Conference : Sixth International Congress of Chemical Engineering

Number of pages : 6

Abstract: A static to dynamic approach to modeling Asphaltenes has been developed and validated. A new algorithm for static asphaltene modeling uses a multi-solid thermodynamic approach where equivalence of fugacity for each component and phase is applied in equilibrium conditions. This is required for minimizing Gibbs free energy. The fractal distribution function used for splitting and characterization of heavy components provides accurate results. The precipitation and re-dissolution of asphaltenes are investigated for a relatively heavy crude oil from an Iranian field. A series of experiments are designed and carried out quantitatively to obtain a permeability reduction in a slim tube. Using a dynamic reservoir simulator, a 3-dimensional asphaltene model is developed to simulate precipitation, flocculation, deposition, and its impact on permeability in a slim tube. With this approach, the asphaltene is defined as a set of components (s) that can precipitate, depending on their molar mass percentage in the solution. The simulated permeability reduction due to asphaltene deposition shows a good agreement with our experimental data

Effect of the extrusion variables and chips water content on the thermal and molecular weight characteristics of nylon 6-6

Effect of the extrusion variables and chips water content on the thermal and molecular weight characteristics of nylon 6-6

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Part of #Effect of the extrusion variables and chips water content on the thermal and molecular weight characteristics of nylon 6-6# :

Publishing year : 2011

Conference : International Conference on Polymer Processing

Number of pages : 5

Abstract: A study has been carried out to determine the effect of melt temperature on the thermal properties of nylon 6-6. UV spectroscopy and TGA showed that nylon 6-6 is the least stable above polymer polymer commercial temperature and can lead to changes in polymerization degree. Also, the rheological behavior of polyamide 6-6 samples with different initial moisture levels is investigated. For this reason, nylon chips with several water content were used to determine its effect on the molten molecular weight of the nylon. Investigations indicate that water content has a strong effect on the rheological properties of nylons. If the amount of water is less than that prescribed by the thermodynamic equilibrium constant, the reaction proceeds towards further condensation, and the molecular weight increases. If the amount of water is greater than the equilibrium value, the reaction goes in the direction of hydrolysis, consequently, the molecular weight decreases

On study of Electro-osmotic flow in a micro channel with obstacles using the Lattice-Boltzmann method

On study of Electro-osmotic flow in a micro channel with obstacles using the Lattice-Boltzmann method

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Part of #On study of Electro-osmotic flow in a micro channel with obstacles using the Lattice-Boltzmann method# :

Publishing year : 2015

Conference : International Conference on Engineering, Art and Law

Number of pages : 14

Abstract: The electro-osmotic flow (EOFs) has become a reliable, non-moving part strategy for controlling fluid motion in various lab-on-chip devices. In the present work, a relatively new Lattice Boltzmann model has been used to study the electro-osmotic flows in a 2-D flat microchannel. The governing equations are presented in the continuum model, while introducing a set of equivalentequations in Lattice Boltzmann's model And solved numerically. The Nernest-Plank equation is used to model the internal potential field for more accurate results. Subsequently, different patterns for various numbers of circles have been proposed and then solved. The studies have been carried out in different sets of one, two, and three circle settings to get a better understanding of the fluid flow and then to study its mixing inside the channel. It has been noticed that the eccentric placement of the circles and placing them in an oscillating pattern helps the mixing effect.

Review of Top Algorithms Based on LEACH Protocol

Review of Top Algorithms Based on LEACH Protocol

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Part of #Review of Top Algorithms Based on LEACH Protocol# :

Publishing year : 2015

Conference : International Conference on Science and Engineering

Number of pages : 8

Abstract: Wireless sensor networks (WSNs) include a number of nodes that can communicate with each other and with the base station. In these networks, due to the nature of the characteristics compared to other wireless networks, routing has been a major challenge, and its related protocols can be designed based on application or type of architecture. In the cluster-based protocols, the network is divided into small groups called clusters and each cluster has a cluster head and some members. The use of clustering has been made to improve the lifetime of the network and optimize the use of energy. The LEACH algorithm has been one of the main routing protocols of the hierarchical type in which cluster heads are randomly selected. Several methods such as PLEACH, Modified LEACH, E-LEACH and LEACH-C algorithms have been provided in order to improve that and in this paper, the advantages, disadvantages, efficiency and challenges associated with them are examined.

Spectral Reconstruction of the Pixels in a Satellite Image through Mixing Process

Spectral Reconstruction of the Pixels in a Satellite Image through Mixing Process

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Part of #Spectral Reconstruction of the Pixels in a Satellite Image through Mixing Process# :

Publishing year : 2011

Conference : Fifth International Conference on Science and Technology

Number of pages : 8

Abstract: This research introduces a technique based on the spectral mixing i.e. Something is opposite to the well-known unmixing technique. This is done by rearranging and retrieving the pixel surface materials in order to make it look like some predefined pixels. The method is called Pixel MAKeup (PMAK). This means that it has been tried to find a way to select materials where, when spreading them out on the pixel surface, the resultant pixel spectral reflection gets similar to some predefined surface covers. The PMAK method was run for two subsets of one LISS-III P6 image in three bands where one of them is taken as the primary (the one that is intended to be reconstructed), and the other one is secondary (the one that reconstructed Primary subset should be looked like). The RMSE between secondary and PMAK output was found to be 0.0061, 0.0057 and 0.0035 for bands 2, 3 and 4 respectively. The number of materials used for this pixel reconstruction was as little as 3. Of course, if we increase the number of bands, then the number of these materials can significantly increase. However, the simple concepts of the PMAK method would make it applicable to any sensor with any number of bands.

Optimal Reactive Power Control in a Microgrid Considering Distributed Generations and Uncertainty of Wind Farms

Optimal Reactive Power Control in a Microgrid Considering Distributed Generations and Uncertainty of Wind Farms

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Part of #Optimal Reactive Power Control in a Microgrid Considering Distributed Generations and Uncertainty of Wind Farms# :

Publishing year : 2013

Conference : 21st Iranian Conference on Electrical Engineering

Number of pages : 8

Abstract: Due to the rapid growth of utilization of distributed generations (DGs) in microgrid, their various issues are the subject of many recent researches. On the other hand, wind power generation is growing rapidly around the world and depends on the capacity of wind farms, it can participate in microgids. In such a case, the uncertainty of wind affects the operation of microgrid in many different aspects. Considering the stochastic effect of wind farms on microgrid operation and the existence of some electronically interfaced DGs (EIDGs) in a microgrid, this paper proposes an Optimal Power Flow (OPF) formulation to determine optimal control variables for each EIDG, such as PQ , PV and a new model of DGs which is named Q-sharing DGs in a microgrid to achieve the minimum power loss. Numerical studies is a 34-bus IEEE distribution test system including six EIDGs with a wind farm show satisfactory results.

Increasing the Reliability and the Profit in a Redundancy Allocation Problem

Increasing the Reliability and the Profit in a Redundancy Allocation Problem

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Part of #Increasing the Reliability and the Profit in a Redundancy Allocation Problem# :

Publishing year : 2011

Conference : First National Conference on Systemic Approach in Iran

Number of pages : 22

Abstract: This paper proposes a new mathematical model for multi-objective redundancy allocation problem (RAP) without component mixing in each subsystem when the redundancy strategy can be selected for individual subsystems. The majority of the mathematical model for multi-objective redundancy allocation problems (MORAP) assumes that the redundancy strategy for each subsystem is predetermined and fixed. In general, active redundancy has received more attention in the past. However, in practice, both active and cold-standby redundancies can be used within a particular system design and the choice of redundancy strategy becomes an additional decision variable. The proposed model for MORAP simultaneously maximizes the reliability and the net profit of the system. And finally, to clarify the proposed mathematical model, a numerical example will be solved.