El-Arish Suez Canal University, EGYPT
El-Arish Suez Canal University, EGYPT
In this paper, using the technique of degenerate kernel method we discussed the problem of existence and uniqueness for nonlinear integral equations of Volterra type with deviating argument, and error estimation of approximate.
Tokyo University of Agriculture and Technology, Japan
Tokyo Univcrsity of Agriculture and Technology, Japan
Tokyo Univcrsity of Agriculture and Technology, Japan
Long-term load forecasting is necessary to set up a stable power system and in the recent years, some energy customers meet portions of electricity demand with local generation in order to more precisely anticipate energy costs and to maintain power quality and reliability. Knowledge of accurate location-specific weather, climate, and electricity market information is necessary to model the value of introducing distributed power generation in micro grid system over the long term. If retail electricity prices vary with load, and therefore weather, this calculation can be very complex. The economic and reliable operation of the leading renewable resource, wind power generation, is especially demanding of accurate weather forecasts and tools for planning and operations. And in this research, an investigation is held to deal with entire power system in Japan considering the case of power deregulation in the near future that suggests introducing distributed power generations in micro grids having renewable energies in deregulated environment.
Science College Suez Canal Univ. Ismailia 41522- Egypt
Filtering techniques in the wavelet transform domain has been effectively used in noise reduction with minimum side effects on image details and edges. In this paper, a new adaptive iterative denoise method using wavelet-based thresholding neural network is presented. The noise ratio is further reduced by applying the iterative filtering process with alternating image axis direction at each step. The results presented indicate that for denoising applications, the proposed method is very effective in adaptive finding the optimal image in Mean Square Error (MSE) sense. It is also shown that this method gives better filtering performance than those conventional wavelet shrinkage methods in MRI images.
American International University-Bangladesh [AIUB]
Asian Institute of Technology [AIT], Thailand
This paper represents a virtual cellular and Dedicated Short Range Communications (DSRC) technology application to determine the optimum cell size for transport riverside communication in riverine navigation systems. In virtual cellular architecture more than one base station with different polarizations are placed under one control base station which increases the coverage area. DSRC is a very well known technology for the communications between the moving vehicle and roadside antennas. The standard frequency for DSRC is 5.8 GHz. The validity of DSRC for the riverine communication environment was never done before. Application of DSRC technology in riverine communication environment gives some interesting results. In this paper we applied a three-tier cellular architecture to simulate the transport to riverside communications using the DSRC technology.
American International University-Bangladesh [AIUB]
Kitami Institute of Technology, Japan
Kitami Institute of Technology, Japan
This paper presents sliding mode control (SMC) based speed control of field-oriented induction motor (IM) taking core loss into account. An augmented system, which is derived from the mechanical dynamics of bi drive, is applied to design the sliding mode control. In order to implement the field-oriented method of IM drive, magnetizing q-axis current and rotor speed are chosen as input and output respectively provided that the magnetizing d-axis current is constant. The control input, which has two parts equivalent control input and switching control input, is carried out by using pole placement technique and Lyapunov stability theory. Consequently, the design controller is stable under the variations of load torque and parameters. The performance of the proposed SMC is verified by simulation. Simulation results show that the proposed SMC can provide good responses for desired speed of field-oriented IM even under the variations of load torque and parameters.
BCSIR, Dhaka
Bangladesh University of Engineering and Technology [BUET]
American International University- Bangladesh [AIUB]
Graphitizable organic materials including coal and coal-peat are characterized by their transition through a liquid or plastic state of optical anisotropy called 'carbonaceous mesophase' as a prerequisite to graphitization. Differential Thermal Analysis (DTA) has been employed for detecting the graphitizability of the substance as well as to determine the temperature intervals of mesophase, the life time of which is limited by its hardening to a semi-coke. DTA trace of graphitizable organic compounds shows an initial large endotherm with activation energy of the order of 60 Keel/mole or above except a very few exceptions. Sensitive tint method of the reflected polarized-light technique has also been found suitable to study the initial formation of spherules, their coalescence and mosaic formation during mesophase period, thereby supplementing the DTA technique. Thus a combination of polarized-light technique and DTA has been found to be a good indicator for characterizing graphitizable organic materials. X-ray analysis has been carried out to see that interlayer spacing of graphite-making carbons decreases with the increase of temperature and ultimately becomes 3.3540A or nearly so, in the graphitizable temperature range 25000C to 30000C. In graphite-making organic compounds there is a sharp fall of resistivity as temperature increases showing a semi-conducting behavior.
American International University-Bangladesh [AIUB]
Bangladesh Atomic energy Commission, Dhaka
The density of states (DOSs) for pure chromium (Cr) and random binary alloys based on Cr with noble metals such as Au and Cu are calculated using the Tight-Binding Linear Muffin- Tin Orbitals method together with Augmented Space Recursion Formalism. The random binary alloys of AuCr and CuCr are generated having the Cr concentrations of 25%, 50% and 75% respectively in each of the alloys. The calculated DOSs are analyzed to explain the electronic structure of these systems.
American International University- Bangladesh [AIUB]
A multi-energy group formalism has been developed from the P1-transport equation to study age and slowing down length of neutrons in non-multiplying systems. Diagonal transport approximation is used to reduce the problem involving anisotropic transfer between groups. The validity of this approximation as well as the suitability of the multi-energy group method has been established by comparing the calculated neutron age with the corresponding measured values. Effect of inelastic scattering on slowing down length of neutrons coming from sources of different energies has also been studied.
American International Univeristy-Bangladesh [AIUB]
Bangladesh University of Engineering and Technology [BUET]
American International University-Bangladesh [AIUB]
The similarity solutions of unsteady mixed convection boundary layer eqautions over a vertical porous flat plate have been investigated by the method of one parameter continuous Group Theory. By repeated applications of this method which reduces the number of independent variables, firstly from three to two and finally from two to one, the governing boundary layer partial differential equations are transformed into a pair of nonlinear ordinary differential equations with appropriate boundary conditions. The set of nonlinear ordinary differential equations are solved numerically by using Nachtsheim-Swigert iteration technique and six orders Runge-Kutta method. The velocity and temperature profiles, skin friction and heat transfer factors are displayed graphically for some values of controlling parameters.
American International University-Bangladesh [AIUB]
Bangladesh University of Engineering and Technology [BUET]
In recent years, storage and transmission limitations have made ECG data compression an important feature for most computerized ECG systems. Because of multi-resolution nature and self-similar structure, wavelet transform has made itself a good choice for compressing non-stationary signals like ECG. This paper applies wavelet transform along with scalar quantization for compression of ECG. The features of different wavelets in compressing ECG are studied. Eight different wavelets from Haar, Daubechies, Coiflet and Biorthogonal families are evaluated for their ability to compress holter ECG data. A set of 25 records is taken as test data from MIT-Bill Arrhythmia Database. All these wavelets give various performances, which are measured by percent root-mean-square difference (PRD). It is found that at higher compression ratios clinically useful information in original signal is best preserved by biorthogonal wavelets than other wavelets used. A compression ratio of 10:1 offers average PRD value 3.05. In almost all the cases 15:1 compressed ECG signals are found clinically useful generalizing biorthogonal to be the best wavelet in ECG compression.
American International University- Bangladesh [AIUB]
Bangladesh University of Engineering and Technology [BUET]
Most of the existing reinforced concrete structures are typically designed primarily for gravity loads and lateral forces that may be much smaller than that prescribed by the current codes. Also due to an inadequate lap splice in the longitudinal reinforcement, lack of confinement in flexural hinge zones, and/or shear strength, these deficiencies can significantly reduce the strength and ductility of a column. It showed that beams, columns and connections were easily damaged during the past earthquakes. Therefore, rehabilitation of similar existing structures is urgently needed in order to improve their seismic performance. This can be achieved, in part, by reducing the load effect input to the existing structures or by improving the strength, stiffness, and/or ductility of the existing structures. While these existing structures were very vulnerable to earthquakes, some modifications to structural configurations and material properties showed enhancement in seismic performance. Therefore, seismic rehabilitation was studied and practitioners applied various seismic rehabilitation techniques to seismically deficient structures. The purpose of this paper is to present an investigation into various rehabilitation techniques for seismically deficient reinforced concrete structures.
American International University- Bangladesh [AIUB]
American International University- Bangladesh [AIUB]
Purdue University, USA
Since the dimensions of Metal-Oxide-Semiconductor (MOS) transistors are shrunken, quantum mechanical effects play a growing role in device operation and performance. In this paper we have calculated the results of numerical self- consistent calculations for the energy levels on p-type Si. Here we have presented a simple yet unified technique to calculate: (i) the eigenenergies and the normalized eigenstates in quantum wells, (ii) the energy varying DOS in leaky quantum wells where the particle lifetime is finite, (iii) The direct tunneling gate current in deep submicron MOS with both SiO2 and high-k dielectric. Also the effect of wave function penetration has been performed. This technique is accurate, easily programmable and unlike other methods, can include the effects of energy boarding of the states due to either the finite particle lifetime in the well or the presence of inelastic scattering.
Information Engineers & Consultant Bangladesh Ltd (IECB), Dhaka
American International University- Bangladesh [AIUB]
American International University- Bangladesh [AIUB]
City University of Hong Kong, Kowloon, Hong Kong
25% of the total revenue earning is achieved from Textile exports for some countries like Bangladesh. It is thus important to produce defect free high quality garment products. Inspection processes done on fabric industries are mostly manual hence time consuming. To reduce error on identifying fabric defects requires automotive and accurate inspection process. Considering this lacking, this research implements a Textile Defect detector. A multi-layer neural network is determined that best classifies the specific problems. To feed neural network the digital fabric images taken by a digital camera and converts the RGB images are first converted into binary images by restoration process and local threshold techniques, then three different features are determined for the actual input to the neural network, which are the area of the defects, number of the objects in a image and finally the shape factor. The develop system is able to identify two very commonly defects such as Holes and Scratches and other types of minor defects (i.e. stretch, fly yarn, dirty spot, slub, cracked point, color bleeding etc). The developed system is very suitable for Least Developed Countries, identifies the fabric defects within economical cost and produces less error prone inspection system in real time.
American International University-Bangladesh [AIUB]
American International University- Bangladesh [AIUB]
American International University- Bangladesh [AIUB]
Many limitations in mobile Ad hoc networks (MANET) impede the usual deployment of traditional security infrastructure. According to the characteristics of transiently associated networks, security incidents in MANET mainly binds to group communication. In this paper, we design a protocol for secure group communication in MANET. Our protocol feasibly works in a server-less environment and provides a distributed light-weight authentication mechanism for instantaneous deployment. Its core technique consists of Zero-Knowledge Proof and threshold cryptography.
American International University-Bangladesh [AIUB]
Perciformes and scorpaeniformes orders of fishes are the main commercial fishes found in the Meditrrean coast of Benghazi. In each order there are many families. The present study is based on data relate to a sample of commercial fishes collected from Benghazi fish market. Attempts have been made to differentiate the fish specimens by order and by families. The differentiation of fish specimens by order and by families is done by stable multivariate test proposed by [1].The differentiation by order is also done by regression technique. Analytical results show that the perciformes order of fishes are significantly different. Also the fish families within each order found significantly different.
