Comilla, Bangladesh
Comilla, Bangladesh

The Comilla University is a public university located at Kotbari, Comilla, Bangladesh. The university was constructed on 50 acres of land at Lalmai Bihar, Moynamoti. Comilla University is affiliated by University Grants Commission, Bangladesh.Golam Mowlah is the founder vice-chancellor of Comilla University who served until he was removed on July 30, 2008. Zulfikar Ali, a professor of mathematics, was given the charge as acting Vice Chancellor. The next vice-chancellor of Comilla University, A.K.M. Zehadul Karim declared his resignation on 7 October 2009 after a major violence in campus. Amir Hossen Khan, a professor of Physics department of Jahangirnagar University, was appointed as Vice Chancellor on 22 November 2009. After expiration of the duration of Professor Dr. Amir Hossen khan then Professor Dr. Ali Ashraf, a professor of Economics department and Ex-President of Chittagong University Teachers Association has been appointed as the 5th Vice Chancellor of Comilla University. He joined the university in 3rd December,2013. The chancellor of the university is Honorable President of Bangladesh Abdul Hamid.It started with 7 functional departments. Now there are a total of 17 departments Under 5 faculties including Information & Communication Technology ,Computer Science & Engineering , Pharmacy, Physics, Chemistry, Statistics, Mathematics, Finance and Banking, Accounting & Information Systems , Marketing, Management Studies, Economics, Public Administration, Archeology, Anthropology, Bengali, and English. Wikipedia.

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Hasan M.,Comilla University | Ohidujjaman,Dhaka International University | Huda M.N.,United International University Dhanmondi
2014 IEEE International Symposium on Signal Processing and Information Technology, ISSPIT 2014 | Year: 2014

Numerous environmental sources of noise and distortion can degrade the quality of the speech signal in a communication system. This study explores the effects of these intrusive sounds on speech applications and introduces some techniques for reducing the influence of noise and, enhancing the acceptability and intelligibility of the speech signal. In this paper, a noise reduction system uses single -microphone method in time domain to improve signal to noise ratio (SNR) of noise contaminated speech. In the early phase of noise reduction, the amount of noise is estimated from the valley of the spectrum based on the harmonic properties of noisy speech, called minimum value sequences (MVS). Therefore, we use the estimated degree of noise (EDON) [1] to adjust the amplitudes of the MVS. The base of the proposed method is to estimate noise continuously on a frame-by-frame basis without the aid of voice activity detector (VAD)[2]. This research uses single-channel adaptive filter (SAF) to reduce time and cost for maximum noise reduction. For this, we propose a minimum computational iteration number (CIN) and generated an equation from set values of SNR and EDON. By adopting the proposed iteration number, the planned system becomes computationally inexpensive and the signal resurgence difficulty is limited in the silent portion. To derive the proposed iteration number equation, we use the third degree parabola equation and least squares solution for the coefficients of EDON. © 2014 IEEE.

Hasan M.,Comilla University | Rahman M.A.,Bangladesh University of Engineering and Technology
2015 18th International Conference on Computer and Information Technology, ICCIT 2015 | Year: 2015

Now a day the World Wide Web (WWW) is a most triumphant communication medium. This represents revolutionary tools to communicate and access information, which enables to access innumerable documents on a huge variety of topics. Though the profusion of information, languages frequently cause troubles. Conversion from another language to Bangla language is instantly a highly demand for Bangladeshi peoples because they are inducing so rapidly on digital contracting and web resources. The Universal Networking Language (UNL)[5] deals to minimize above problems. This helps to conquer the language blockade among citizens of different nations to solve problems rising from current globalization trends. In this paper we propose the psychiatry of Bangla Dirukta Shobdo and translation of Bangla sentences to UNL expression. Here we actually are paying attention on a concept in bangla "Dirukta Shobdo" from Bangla Grammar and what are the principle of converting dirukto shobdo to UNL language and the process of implementation. © 2015 IEEE.

Uddin M.J.,Daffodil International University | Enamul Karim M.,Comilla University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

This study presents the numerical simulations to investigate the effects of the magnetic field parameter, Modified Forchhemier number, Prandtl number, Modified Darcy number, the Local Grashof number, the Dufour number and the Schmidt number on steady two-dimensional, laminar, hydromagnetic flow with heat and mass transfer over a semi-infinite, permeable inclined plate in the presence of thermophoresis and heat generation is carefully considered and equipped numerically. A similarity transformation is used to shrink the governing non-linear partial differential equations into ordinary differential equations. The obtained locally similar equations are then solved numerically by applying Nachtsheim-Swigert shooting iteration technique with sixth-order Runge-Kutta integration scheme. Comparisons with previously published study are performed and the results are found to be in very good agreement. Numerical results for the dimensionless velocity, temperature and concentration profiles are reported graphically as well as for the skin-friction coefficient, wall heat transfer and particle deposition rates are investigated for an assortment of values of the parameters inflowing into the problem. © Maxwell Scientific Organization, 2013.

Mazumdar S.C.,Bangladesh University of Engineering and Technology | Mazumdar S.C.,Comilla University | Khan M.N.I.,Atomic Energy Center | Islam M.F.,Bangladesh University of Engineering and Technology | Hossain A.K.M.A.,Bangladesh University of Engineering and Technology
Journal of Magnetism and Magnetic Materials | Year: 2015

Multiferroic composites (1-y)BiFeO3-yNi0.50Cu0.05Zn0.45Fe2O4 (y=0.0, 0.1, 0.2, 0.3 and 0.4) are synthesized by the standard solid state reaction method. The X-ray diffraction analysis affirms the formation of both the component phases and also reveals that there is no chemical reaction between them. From the energy-dispersive X-ray spectroscopy study it is observed that the percentage of the elements in the component phases is well consistent with the nominal composition of the composites. Field Emission Scanning Electron Microscopy analysis shows almost homogeneous mixture of the two phases. The real part of the initial permeability increases (up to 67%) and the loss decreases with the ferrite content in the composites which is important in application point of view. Dielectric constant (ε′), loss tangent and AC conductivity are measured as a function of frequency at room temperature. The highest ε′ is obtained for 0.6BiFeO3-0.4Ni0.50Cu0.05Zn0.45Fe2O4 composite. The dielectric dispersion at lower frequency (<105 Hz) is due to the interfacial polarization. The complex impedance spectroscopy is used to correlate between the electrical properties of the studied samples with their microstructures. Two semicircular arcs corresponding to both grain and grain boundary contribution to electrical properties have been observed in all the studied samples. The maximum magnetoelectric voltage coefficient is found to be ∼38 mV cm-1 Oe-1 for the composite with 80% ferroelectric+20% ferrite phases. The present composite might be a promising candidate as multiferroic materials showing effective electric and magnetic properties. © 2015 Elsevier B.V. All rights reserved.

Miah M.J.,Bangladesh University of Engineering and Technology | Miah M.J.,Comilla University | Khan M.N.I.,Atomic Energy Center | Hossain A.K.M.A.,Bangladesh University of Engineering and Technology
Journal of Magnetism and Magnetic Materials | Year: 2016

Multiferroic xBa0.95Sr0.05TiO3-(1-x)BiFe0.9Gd0.1O3 [xBST-(1-x)BFGO], where x=0.00-0.40, have been synthesized by the conventional solid-state reaction method. The crystalline phase, microstructure, relaxor behavior, ac conductivity, impedance spectroscopy, dc magnetic properties, complex initial permeability and magnetoelectric coefficient of these solid solutions have been investigated. The crystal structure is found to change from rhombohedral in BFGO rich compositions to cubic when x≥0.30. Room temperature dielectric properties are investigated within the frequency range from 1 kHz to 1 MHz and found to increase with BST content. The frequency dependence of high temperature dielectric measurements indicated that the composites with x≥0.20, exhibit relaxor ferroelectric behavior. The ac conductivity obeys the Jonscher's universal power law and BST helps to enhance the electrical conductivity of the composites. Studies of impedance spectroscopy suggest that only grains have the contribution to the conductivity mechanism in this material. Magnetizations as a function of applied magnetic field measurements show weak ferromagnetism for 0.10 ≤x≤0.30 composites. The maximum value of remnant magnetization is found to be 0.565×103 A/m (=0.08 emu/g) for x=0.25 which is better than previously reported BaTiO3-BiFeO3 systems. The complex initial permeability is found to improve with the increase in BST concentration due to the reduction of oxygen vacancies. In addition, an enhanced magnetoelectric (ME) coupling is also observed and determined by the ME coefficient. The maximum value of ME coefficient is found to be 21.71×10-4 V/A (=1.67 mV/cm Oe) for the x=0.25 composition. The BST-BFGO solid solutions show high-performance multiferroic properties and can be selected for further investigation. © 2015 Elsevier B.V. All rights reserved.

Seddiqui M.H.,Chittagong University | Hoque M.N.,City University of Bangladesh | Rahman M.H.H.,Comilla University
2015 18th International Conference on Computer and Information Technology, ICCIT 2015 | Year: 2015

Every day thousands of news articles are published in Bangla from several different sources on the web and this number is even increasing rapidly. On the contrary, the readers are often selective to read their desired news only. In this connection, classical Information Extraction (IE) techniques are used to query with keywords from unstructured or semi-structured news contents to fulfill partial requirements. However, they cannot interpret sequences of events, relation among entities, inference some unveiled facts to facilitate further human analysis. To achieve this goal, semantic technology adds formal structure and semantics to the news stream. In this paper, we propose a system to analyze Bangla news content to annotate especially things, people and places with semantic technology automatically by extracting what happened, when, where and who being involved in the news with the help of classical Natural Language Processing (NLP) techniques. Furthermore, we relate news of today with the previous news to accumulate information over time. We present our proposed system of annotating Bangla news semantically and experiment with SPARQL to inference integrated news from different sources over time and shows its effectiveness in querying specific information. © 2015 IEEE.

Islam M.S.,Comilla University | Majumdar M.K.H.,Chittagong University | Khan M.R.H.,Comilla University
2015 18th International Conference on Computer and Information Technology, ICCIT 2015 | Year: 2015

Phonons play an important role in determining the electrical and thermal properties of semiconductors and other material systems. A mathematical model based on elastic continuum approach has been used for calculating the phonon dispersion of semiconductor cubic quantum dot. With this model acoustic phonon dispersions of an individual GaAs quantum dot are calculated for three different sizes to investigate the size effect on phonon spectra. Phonon group velocity has also been calculated for each phonon branch by numerical differentiation. © 2015 IEEE.

Mahmud A.,Comilla University | Sattar A.,Comilla University
Proceedings - 2013 International Conference on Advanced Computer Science Applications and Technologies, ACSAT 2013 | Year: 2014

A novel 'ICTization framework' has been proposed to establish a standard interface between assigned and received services and advances the administrative and technical infrastructure to share information resources among local, regional, national, and international platforms. This framework is based on capability, connectivity and context provided in three separate layers namely core, management and distribution that support centralization, decentralization and parallelization features. In this paper the Information and communication technology (ICT) impacting factors have been analyzed and prioritized through a survey. Due to lack of a combined work plan, Bangladesh is still staying behind in comparison to other ICT developed countries whereas the suggested framework is capable to manage and maintain the ICT impacting factors and also can get quickly adapted with the ICT infrastructure. The framework will lessen the misconception about infrastructure, development and communication and capable to improve the synchronization between managements and services. © 2013 IEEE.

Miah M.J.,Bangladesh University of Engineering and Technology | Miah M.J.,Comilla University | Akther Hossain A.K.M.,Bangladesh University of Engineering and Technology
Acta Metallurgica Sinica (English Letters) | Year: 2016

xBa0.95Sr0.05TiO3-(1 - x)BiFe0.9Gd0.1O3 [xBST-(1 - x)BFGO] (x = 0.00, 0.10, 0.20 and 0.25) multiferroic ceramics were prepared by the standard solid-state reaction technique. Structural characterization was performed by X-ray diffraction. All the samples showed rhombohedral distorted perovskite structure. Surface morphology of the ceramics was studied by the field emission scanning electron microscope (FESEM). From the FESEM observation, the grain size was observed to be decreased with increasing BST content. Enhanced magnetic properties were observed in BFGO with the increase in BST content because of large lattice distortion. The complex initial permeability increased with the increasing of BST content. The study of dielectric properties showed that the dielectric constant increased, whereas dielectric loss decreased with increasing of BST content due to the reduction of oxygen vacancies. An analysis of the electric impedance and modulus with frequency was performed at different temperatures. Non-Debye-type relaxation processes occur in the compound which was confirmed from the nature of the Cole-Cole plot. The DC conductivity was found to increase with the rise in temperature which indicates the semiconducting behavior of the compound with characteristics of the negative temperature coefficient of resistance. The activation energy, responsible for the relaxation determined from the modulus spectra (0.246 eV), was found to be almost same as the value obtained from the impedance study (0.240 eV), indicating that charge carriers overcome the same energy barrier during relaxation. The frequency response of imaginary parts of electric impedance and modulus suggested that the relaxation in xBST-(1 - x)BFGO ceramics follows the same mechanism at various temperatures. © The Chinese Society for Metals and Springer-Verlag 2016.

Rashid A.N.M.B.,Comilla University | Islam M.S.,Bangladesh University of Engineering and Technology | Hoque A.S.M.L.,Bangladesh University of Engineering and Technology
Communications in Computer and Information Science | Year: 2011

Because of the query intensive nature of data warehousing or online analytical processing applications, materialized view is quite promising in efficiently processing the queries and for improving the query performance. It is costly to rematerialize the view each time a change is made to the base tables that might affect it. So, it is desirable to propagate the changes incrementally. Hence, all of the views cannot be materialized due to the view maintenance cost. In this paper, we have developed a dynamic cost model based on threshold level incorporating the factors like view complexity, query access frequency, execution time and update frequency of the base table to select a subset of views from a large set of views to be materialized. A number of algorithms and mathematical equations have been designed and developed to define the dynamic threshold level. © 2011 Springer-Verlag Berlin Heidelberg.

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