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Search Results: 1 - 10 of 344 matches for " Rubaiyat Yasmin "
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Groundwater Modelling of the North-Eastern Part of Barind Tract for its Sustainable Development and Management, Bangladesh
Rubaiyat Yasmin
Asian Journal of Information Technology , 2012,
Abstract: Groundwater is an important natural resource of the world. Large-scale groundwater utilization in the past world has resulted in adverse economic-cum-environmental problems such as continual decline of piezometric levels, land subsidence and groundwater quality deterioration. Groundwater modelling of the study area has been prepared for the assessment of groundwater resources and to prescribe a long-term development policy. FLOWNET and MODFLOW has been used and calibrated to simulate the groundwater levels in the aquifer system. The model is calibrated against the field hydrographs of the study area. The aquifer system responses to different pumping schemes are then predicted for different periods. The present model could be used for future planning of sustainable groundwater development and management of the area studied.
Detection of Smoke Propagation Direction Using Color Video Sequences
Rubaiyat Yasmin
International Journal of Soft Computing , 2012,
Abstract: To better assess fire location and direction of fire development, it is crucial to detect smoke and a clear undestanding of smoke propagation direction. Smokes tend to progress rather than backtrack. They do not usually go in one direction. The proposed method focuses on the detection of smoke propagation direction with image analysis that enables a potential fire risk situation to be recognized at an early stage. Using the consecutive smoke image frames having significant smoke candidate, comparison has been done by DP matching to detect the global direction of smoke propagation. In this research, the possible directions of smoke have been grouped into 4 categories. The direction of movement of smoke in one category shows the global direction of smoke propagation in that direction. The general information about that direction can be used to identify area at risk for at least filling with smoke and possibly catching fire.
Segmentation and Recognition of Unconstrained Bangla Handwritten Numeral
Dipankar Das,Rubaiyat Yasmin
Asian Journal of Information Technology , 2012,
Abstract: This study deals with the segmentation and recognition of unconstrained off-line Bangla handwritten numerals. The projection profile-based heuristic technique is used to segment handwritten numerals. The results, based on this approach are quite satisfactory for the next classifier stage. Following the segmentation, character matrices from each numeral are extracted, normalized and then passed through an Artificial Neural Network (ANN) classifier for classification. The proposed scheme is tested on data collected from different individuals of various background and foreground colors.
Performance Evaluation of a Concatenated Interleaved Forward Error Correction Scheme Based Orthogonal Frequency Division Multiplexing System
Dulal Haque,Rubaiyat Yasmin,Shaikh Enayet Ullah,M.A.F.M. Rashidul Hasan
Asian Journal of Information Technology , 2012,
Abstract: In this study, the performance of an Orthogonal Frequency Division Multiplexing (OFDM) system under different combination of digital modulations( BPSK, QPSK, 8-QAM and 16-QAM ) and a concatenated interleaved Forward Error Correction (FEC) scheme on the transmission of an audio signal has been evaluated. The OFDM system incorporates Reed-Solomon (RS) encoder of (255,239,8) with Convolution encoder with , and -rated codes in FEC channel coding. A computer program written in the MATLAB source code is developed and the simulation study is made with the acquisition of recorded audio signal and its processing under Additive White Gaussian Noise (AWGN) channel. The simulation results of estimated Bit Error Rate (BER) show that the implementation of interleaved RS (255,239,8) code with -rated Convolution code under BPSK modulation technique is highly effective to combat inherent interference in the communication system. It is anticipated that the performance of the communication system degrades with the increasing of noise power. Due to constraint in data handling capability of the Matlab Editor, a segment of the recorded audio signal is used for analysis. The transmitted audio message is found to have retrieved effectively under noisy situation.
Performance Analysis of OFDM-based System for Various Channels
I. Pramanik,M. A. F. M. Rashidul Hasan,Rubaiyat Yasmin,M. Sakir Hossain,Ahmed Kamal S. K
Mathematics , 2013,
Abstract: The demand for high-speed mobile wireless communications is rapidly growing. Orthogonal Frequency Division Multiplexing (OFDM) technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems in the near future. This paper investigates the performance of OFDM-based system over static and non-static or fading channels. In order to investigate this, a simulation model has been created and implemented using MATLAB. A comparison has also been made between the performances of coherent and differential modulation scheme over static and fading channels. In the fading channels, it has been found that OFDM-based system's performance depends severely on Doppler shift which in turn depends on the velocity of user. It has been found that performance degrades as Doppler shift increases, as expected. This paper also performs a comparative study of OFDM-based system's performance on different fading channels and it has been found that it performs better over Rician channel, as expected and system performance improves as the value of Rician factor increases, as expected. As a last task, a coding technique, Gray Coding, has been used to improve system performace and it is found that it improves system performance by reducing BER about 25-32 percent.
Cough: meeting the needs of a growing field
Rubaiyat A Haque, Kian Chung
Cough , 2005, DOI: 10.1186/1745-9974-1-1
Abstract: Between 2000 and 2004, the number of PubMed entries per year containing the keyword 'cough' has increased by forty percent. This partially reflects a general increase in the number of scientific publications over this period but it also represents a specific growth in interest in cough-related research. This interest spans a number of medical and scientific disciplines other than respiratory medicine, such as gastroenterology, rhinology, paediatrics, infectious disease, pharmacology, neurology, neuroanatomy, genetics, inflammation, etc. The need for a single journal that brings together clinicians and scientists in all of these disciplines with the aim of achieving a better understanding of cough-related disease has been long overdue. So it gives us great pleasure to welcome you to Cough. Besides being the only journal to specialise in this particular area of research, Cough is special for other reasons. Embracing the modern era of information technology, Cough is an entirely online journal. Our online submission system allows for rapid review and revision of manuscripts and when accepted, articles appear in the journal immediately. More significantly, Cough is an Open Access journal. All articles are freely and universally accessible without subscription. Authors of published articles retain the copyright to their work and the full text of each article is permanently archived in PubMed Central. It will be of interest to contributors that free online access can increase the impact of a paper [1].Cough is a common symptom of many respiratory and non-respiratory disorders. It is useful from a diagnostic point of view to divide cough into acute (lasting less than three weeks) and chronic (lasting longer than eight weeks) types [2]. Acute cough is the most frequently reported respiratory symptom and the commonest reason for medical consultation. The majority of cases of acute cough are due to upper respiratory viral infections. The disease is self-limiting and symptoms
Differences in Acute Phase Reactants between Gout and Pseudogout  [PDF]
Clement E. Tagoe, Yasmin Raza
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.412A2003
Abstract:

Objectives: To define clinical differences in the acute phase response and serum acute phase reactants between gout, pseudogout and crystal-induced arthritis in the presence of non-articular infections (CAI). Patients and Methods: Eleven patients with definite gout, 12 patients with pseudogout and 5 patients with CIA were included in the study. Results: The erythrocyte sedimentation rate (ESR) was significantly different between gout (68.2 ± 49.9 mm/Hr) and CIA (113.8 ± 37.2 mm/Hr) but not between gout and pseudogout (83.9 ± 45.6 mm/Hr) or between pseudogout and CIA. The C-reactive protein (CRP) was significantly increased between gout (10.1 ± 7.9 mg/dL) and pseudogout (18.9 ± 9.8 mg/dL), gout and CIA (36.5 ± 12.4 mg/dL) as well as between pseudogout and CIA. The peripheral white cell count was significantly different between gout (9.27 ± 3.7 k/μL) and CIA (16.5 ± 6.8 k/μL), and between pseudogout (8.9 ± 3.2 k/μL) and CIA. Conclusions: Measurement of ESR and CRP are helpful in crystal-induced arthritis. The CRP has more discriminating utility than the ESR in distinguishing between gout, pseudogout and CIA. Peripheral wbc is most useful for differentiating crystal-induced arthritis from CIA.

Parasitic Effects on the Performance of DC-DC SEPIC in Photovoltaic Maximum Power Point Tracking Applications  [PDF]
Nur Mohammad, Muhammad Quamruzzaman, Mohammad Rubaiyat Tanvir Hossain, Mohammad Rafiqul Alam
Smart Grid and Renewable Energy (SGRE) , 2013, DOI: 10.4236/sgre.2013.41014
Abstract:

This paper presents an analysis of the effect of parasitic resistances on the performance of DC-DC Single Ended Pri- mary Inductor Converter (SEPIC) in photovoltaic maximum power point tracking (MPPT) applications. The energy storage elements incorporated in the SEPIC converter possess parasitic resistances. Although ideal components significantly simplifies model development, but neglecting the parasitic effects in models may sometimes lead to failure in predicting first scale stability and actual performance. Therefore, the effects of parasitics have been taken into consideration for improving the model accuracy, stability, robustness and dynamic performance analysis of the converter. Detail mathematical model of SEPIC converter including inductive parasitic has been developed. The performance of the converter in tracking MPP at different irradiance levels has been analyzed for variation in parasitic resistance. The converter efficiency has been found above 83% for insolation level of 600 W/m2 when the parasitic resistance in the energy storage element has been ignored. However, as the parasitic resistance of both of the inductor has increased to 1 ohm, a fraction of the power managed by the converter has dissipated; as a result the efficiency of the converter has reduced to 78% for the same insolation profile. Although the increasing value of the parasitic has assisted the converter to converge quickly to reach the maximum power point. Furthermore it has also been observed that the peak to peak load current ripple is reduced. The obtained simulation results have validated the competent of the MPPT converter model.

LUC Model : A Timestamp Ordering based View Consistency Model for Distributed Shared Memory
Rubaiyat Islam Rafat,Kazi Muheymin Sakib
Journal of Computers , 2010, DOI: 10.4304/jcp.5.12.1828-1838
Abstract: Excessive locking and cumulative updates in Distributed Shared Memory (DSM) not only reduces the parallelism for block access but also causes a serious degradation in response time for a dense network. This paper proposes a new consistency model in DSM named Last Update Consistency (LUC) model, where the model uses logical clock counter to keep the DSM consistent. The logical clock always increases never decreases. So the increasing order of the logical clock value is used to provide the request to the DSM. In this model, multiple nodes can perform READ operations over the same block at a time. For WRITE operation over the same block, only the last modi cation will exist and the earlier WRITE operations will be treated as obsolete WRITE and should be discarded. The experimental and analytical analysis showed that the proposed model effectively reduces the unnecessary network traf c and cumulative block updates that exist in the Sequential Consistency Model and Release Consistency Model.
Analytical Performance Evaluation of Space Time Coded MIMO OFDM Systems Impaired by Fading and Timing Jitter
Md. Rubaiyat H. Mondal,Satya P. Majumder
Journal of Communications , 2009, DOI: 10.4304/jcm.4.6.380-387
Abstract: An analytical approach is presented to determine the impact of time selective fading, timing jitter and additive white Gaussian noise (AWGN) on the bit error rate (BER) performance of an orthogonal frequencydivision multiplexing (OFDM) system with differential quaternary phase-shift keying (DQPSK), differential phase-shift keying (DPSK) and quaternary phase-shift keying (QPSK) modulation. The expression for the conditional BER conditioned on a given timing error and fading, is derived and the average BER is evaluated. The BER performance results are evaluated for different values of fading and jitter. The performance of the OFDM system in Rayleigh and Rician fading channels is also compared. Analytical approach is also developed to evaluate the BER performance of a quasi-orthogonal- space-time block coded OFDM system having multiple transmitting and single receiving antennas. The analysis is extended for a multiple-input multiple-output (MIMO)-OFDM system using the “selection method” for combining multiple receiving antennas, which offers significant improvement in the system performance. The effects of increase in number of OFDM subcarriers and increase in Doppler frequency are also investigated.
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