Rājshāhi, Bangladesh
Rājshāhi, Bangladesh

Time filter

Source Type

Rokunuzzaman Md.,RUET | Sekiyama K.,Nagoya University | Fukuda T.,Nagoya University
2012 7th International Conference on Electrical and Computer Engineering, ICECE 2012 | Year: 2012

This paper describes about common region of interest (CROI) generation between two mobile robots with the help of cognitive ontology for solving a cooperative task. In this research, both robots are observing different region of the scene and have different capabilities. In this method, robots use cognitive ontology and evaluate various semantic relations of concepts in a ROI. After evaluation, robots select the best region of interest (ROI) based on semantic relatedness and feature ambiguity value with the help of best feature selection algorithm. To make it useful in cooperation, robots generate CROI by sharing the best ROI. The experimental results showed that the method is very useful for distributed cognition which is very crucial problem in AI. © 2012 IEEE.


Beg R.A.,RUET | Beg R.A.,Rajshahi University of Engineering and Technology | Sarker M.R.I.,RUET | Sarker M.R.I.,Rajshahi University of Engineering and Technology | And 2 more authors.
International Journal of Mechanical and Mechanics Engineering | Year: 2010

Due to scarcity of petroleum products, the used engine oils can be used in engine as engine oil after purifying it. Production of diesel fuel from used engine oil is involving chemical filtrations and blending process. It could solve some of the energy problem with increasing the blending percentage of pre-treated used engine oil (UEO) or by using pre-treated used engine oil as a diesel fuel. In the present study, samples of shipyard and light vehicles (bus and truck) pre-treated used engine oil and different percentage of blending of pre-treated used engine oil (including clay treatment, CT) into fresh diesel have been considered. Results show that pre-treated (including CT) used engine oil of shipyard (UEO) and 35% blending of pre-treated (including CT) used engine oil (UEO) into fresh diesel are suitable to use as a diesel fuel considering Caterpillar Specific Limit and comparing with the fresh diesel.


Roy T.K.,RUET | Morshed M.,MBSTU | Tumpa F.K.,RUET | Pervej M.F.,RUET
2015 IEEE International WIE Conference on Electrical and Computer Engineering, WIECON-ECE 2015 | Year: 2015

This paper presents a nonlinear control scheme to control the attitude of a small-scale rotary wing unmanned aerial vehicle (RUAV) in the presence of external disturbances. The proposed attitude controller is designed in such a way that it is robust to external disturbances. To prove the convergence of the attitude tacking error to zero, i.e., the actual attitude of the closed-loop system to reference attitude of RUAV, a control Lyapunov function (CLF) is formulated in every step of the design procedure which is ensured through the negative definiteness of the derivative of CLF. Finally, the performance of the proposed controller is tested using a high-fidelity simulation model by considering external wind gusts into the system. Simulation results illustrate the robustness of the proposed controller over an existing controller in terms of rejecting external disturbances. © 2015 IEEE.


Roy T.K.,RUET | Morshed M.,MBSTU | Tumpa F.K.,RUET | Pervej M.F.,RUET
2015 IEEE International WIE Conference on Electrical and Computer Engineering, WIECON-ECE 2015 | Year: 2015

A robust adaptive backstepping technique is proposed in this paper to solve the speed-tracking problem of a series DC motor for improving transient response. The parameters of DC motor are considered as unknown and the external disturbances are incorporated into the dynamical model. The proposed controller is designed in such a way that it is adaptive to the unknown parameters of series DC motor and robust to external disturbances. The unknown parameters are estimated through the adaptation laws and the convergences of these adaptation laws are obtained through the negative semi-definiteness of control Lyapunov functions (CLFs). The proposed controller not only provides robustness property against external disturbances but also overcomes the over-parameterization problem which usually appears in some conventional adaptive methods. Finally, the performance of the proposed controller is tested on a MATLAB simulation model. The performance of the proposed scheme is compared with that of an existing backstepping controller where the external disturbances are neglected. Simulation results demonstrate the effectiveness of the proposed controller in terms of rejecting external disturbances. © 2015 IEEE.


Mondal M.A.,RUET | Stefaan De.H.,RUET | Ladha J.K.,RUET
Journal of Mechanical Engineering Research and Developments | Year: 2015

The multivariate two-variance regression model and its analysis method are established. The multivariate regression and confidence limit curves (or surfaces) with high confidence level and high reliability are also given. The multivariate two-variance regression model involves two kinds of independent variable, one of which is associated with the process such as test time, and the other is associated with test state such as temperature, therefore the presented method extends traditional multivariate regression analysis to process data and can analysis stochastic processes under various test conditions simultaneously, such as aero engine thrust curves and performance degradation curves. The concept of polynomial two-variance process and regression analysis method for polynomial two-variance model are also put forward. The presented method exploits the lengthwise information among different test times, therefore it can solve the problem of reliability assessment with small sample and higher precision.


Hossen M.A.,RUET | Chowdhury S.A.H.,RUET | Anower M.S.,RUET | Hossen S.,RUET | And 2 more authors.
2nd International Conference on Electrical Engineering and Information and Communication Technology, iCEEiCT 2015 | Year: 2015

Signal length possesses a very important role in size estimation of underwater wireless sensor network (UWSN). As size estimation is very tough in UWSNs using conventional protocol techniques, a cross-correlation based technique is introduced to estimate the number of nodes. In UWSN, The greater the signal length, the more energy is required to perform the estimation. In this paper, we observe the effect of signal length (Ns) over the number of estimated nodes (N) in a spherical region of an underwater acoustic sensor network (UASN) using three sensors and investigate the error in node estimation for different Ns. As the theoretical required Ns is infinity (Ns = 106 samples is used in simulation), using minimum Ns how it is possible to go through a successful estimation process i.e., accurate node estimation is being observed and discussed. © 2015 IEEE.


Pervej M.F.,RUET | Sarkar M.Z.I.,RUET | Islam M.T.,RUET
2nd International Conference on Electrical Engineering and Information and Communication Technology, iCEEiCT 2015 | Year: 2015

The Bit Error Rate (BER) and Peak to Average Power Ratio (PAPR) are the major concerns for wireless communication. This paper aims to analyze these two important parameters for different inputs and outputs block sizes of the discrete Fourier transform (DFT) based single carrier frequency division multiple access (SCFDMA) system by using the conventional raised cosine (RC) and square root raised cosine (RRC) pulse shaping filters for different sub-carrier mapping schemes (e.g. interleaved frequency division multiple access (IFDMA), localized frequency division multiple access (LFDMA) and distributed frequency division multiple access (DFDMA)). Note that DFT based SCFDMA system is being adopted for uplink communication in the long term evolution (LTE) for its lower PAPR. The suitable block size of SCFDMA is crucial to improve wireless communication performances in terms of BER and PAPR, because if the block sizes vary then the PAPR also changes. Therefore, this paper analyzes the impact of the input and output block sizes of the system on enhancement of the system performances. Taking help from the numerical analysis and evaluation, this paper shows the way to choose the proper input and output block size to have a significantly lower PAPR and BER. © 2015 IEEE.


Pervej M.F.,RUET | Sarkar M.Z.I.,RUET | Roy T.K.,RUET | Koli M.N.Y.,RUET
2014 17th International Conference on Computer and Information Technology, ICCIT 2014 | Year: 2014

This paper aims to analyze the bit error rate (BER) and peak to average power ratio (PAPR) for discrete cosine transform (DCT) based single carrier frequency division multiple access (SCFDMA) system. Note that BER and PAPR are the major concerns for any wireless communication and for having lower PAPR till now discrete Fourier transform (DFT) based SCFDMA is implemented for the up-link communication for long term evolution (LTE). This paper focuses to analyze the effect of the input and output block size of DCT based SCFDMA system which is a supplementary of the DFT-SCFDMA system. Using the conventional raised cosine (RC) and square root raised cosine (RRC) pulse shaping filters with different sub-carrier mapping schemes (e.g. interleaved frequency division multiple access (IFDMA), localized frequency division multiple access (LFDMA) and distributed frequency division multiple access (DFDMA)) the paper analyze the PAPR for the DCT based SCFDMA system. The suitable block size of DCT-SCFDMA is very important to improve the BER and PAPR performances of the system because if the block sizes vary then the PAPR also changes. Therefore, this paper also analyzes the impact of the input and output block size of the system. Finally, the numerical evaluation is done using the pulse shaping filter for different sub-carrier mapping schemes based on the different block sizes. From the numerical analysis and evaluation this paper shows the way to chose the input and output block size to have a significantly low PAPR and BER. © 2014 IEEE.


Pervej M.F.,RUET | Sarkar M.Z.I.,RUET | Roy T.K.,RUET | Hasan M.M.,RUET | And 2 more authors.
2014 17th International Conference on Computer and Information Technology, ICCIT 2014 | Year: 2014

This paper is concerned with the reduction of peak to average power ratio (PAPR) of 3rd generation partnership project (3GPP) LTE standard using the single carrier-frequency division multiple access (SCFDMA) for mobile uplink transmission. The PAPR reduction is done based on the discrete Fourier transform (DFT) spreading technique which is well known as DFT - SCFDMA and in case of LTE which can reduce the PAPR of OFDM signal to a level of single carrier transmission. Note that the needed power of the signals for uplink transmission of LTE is varied depending on the different sub-carrier mapping and modulation techniques. This paper discusses different sub-carrier mapping techniques such as-localized FDMA (IFDMA), distributed FDMA (DFDMA) and interleaved FDMA (IFDMA). To show the effectiveness of DFT-SCFDMA in the reduction of PAPR with different sub-carrier mapping and modulation techniques the results are compared with the conventional OFDMA system. This paper also shows the comparative results of different sub-carrier mapping techniques in terms of symbol error rate (SER). The comparative results show that the DFT-SCFDMA greatly enhances the PAPR reduction for LTE uplink transmission over the conventional OFDMA. © 2014 IEEE.

Loading RUET collaborators
Loading RUET collaborators