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Jeong B.Y.,National Cancer Center Institute | Murshed M.S.,Northern University of Bangladesh | Seo Y.A.,Chonnam National University | Park J.-S.,Chonnam National University
Stochastic Environmental Research and Risk Assessment | Year: 2014

A three-parameter kappa distribution (K3D) as a special case of the four-parameter kappa distribution is studied. This distribution (K3D) is viewed as a generalized Gumbel distribution. A description of the mathematical properties of K3D is provided. We consider the moment generating function, the moments, the L-moments, LH-moments, the asymptotic distribution of the extreme order statistics, and its graphical illustrations. Parameters are estimated by using the method of L-moments and maximum likelihood method. A Monte-Carlo simulation study is given to compare the estimation methods. To illustrate its applicability, heavy rainfall data from Korea is analyzed, and the fitness is compared with Gumbel, generalized extreme value and four-parameter kappa distributions. © 2014, Springer-Verlag Berlin Heidelberg.

Murshed M.S.,Northern University of Bangladesh | Murshed M.S.,Chonnam National University | Seo Y.A.,Chonnam National University | Park J.-S.,Chonnam National University
Stochastic Environmental Research and Risk Assessment | Year: 2014

The study of distribution tails is a fundamental research in statistical frequency analysis relevant to many research fields, such as insurance, hydrological events, earthquake, etc. Here, we describe and investigate the effect and feasibility of the high-order L-moment (LH-moment) method for estimating heavy-tail conditions by fitting a four parameter kappa distribution. Details of parameter estimation using LH-moments for the four parameter kappa distribution (K4D) are described and formulated. Monte-Carlo simulation is performed to illustrate the performance of the LH-moment method in terms of heavy-tail quantiles over all quantiles using K4D and non K4D samples, respectively. The result suggests that the method is either useful (when the method of L-moment estimation fails to give a feasible solution) or as effective as the L-moment approach in handling data following K4D. Applications to the annual maximum flood and sea level data are presented. © 2013 Springer-Verlag Berlin Heidelberg.

Parvin S.,Northern University of Bangladesh | Fujii T.,University of Electro - Communications
2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014 | Year: 2014

In mobile Multi-hop Cognitive radio network (CRN) routing is a challenging issue since Secondary users (SU) mobility and Primary user (PU) activity may cause radio links to break frequently. The stability and reliability of a route depends on the availability of the links constituting the route. In this paper, we propose a mobility aware stable routing scheme that considers the SUs mobility and the PUs activity. First the second smallest eigen value of the Laplacian matrix is used to define the link availability in terms of the PU activity. Second the link availability prediction is used to predict the link duration in terms of SU mobility. Finally a routing metric is defined that takes into account the route stability, PU activity and SU mobility. Simulation result shows that the proposed routing scheme enhances the route stability compared with other routing approaches. Our proposed routing scheme achieves lower end-to-end delay and higher throughput. © 2014 Asia-Pacific Signal and Information Processing Ass.

Mahbuba D.,Northern University of Bangladesh | Mahbuba D.,University of Antwerp | Rousseau R.,University of Antwerp | Rousseau R.,Catholic University of Leuven
Scientometrics | Year: 2013

We propose new variations of the standard and the real-valued (or interpolated) h-index. More precisely, we propose two different types. For the first type, sources are years, and items are either publications, or citations received or citations per publication. The second type makes use of the speed by which citations are received: it is a diffusion speed index. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Ul Masood M.R.,Northern University of Bangladesh
16th Int'l Conf. Computer and Information Technology, ICCIT 2013 | Year: 2014

The requirement of Bangla character recognition has become one of the prime attentions among the current researchers due to the increase of automated systems and usage of hand held devices. This paper presents a novel approach to recognize handwritten bangla numerals and addresses a robust feature extraction scheme that spawns 23-dimensional features based on the numeral's structure and topology. The recognition scheme is organized with a proposed decision tree that has been justified using entropy calculation. Considering inconsistency in individuals' writing style and the presence of significant curves and loops, the proposed feature extraction method restricts to less dimensional features of each numeral from 14600 data samples. The recognition time of this scheme is much lower than the existing procedures, since the preprocessing tasks have been performed during down sampling operation. The quick response time 13.04 ms and the higher accuracy (96.82%) explore a new era for the proposed scheme of being implemented in Bangla numeral LeadPad toys. © 2014 IEEE.

Sadeque S.,Simon Fraser University | Ahmed I.,Northern University of Bangladesh | Vaughan R.,Simon Fraser University
Canadian Conference on Electrical and Computer Engineering | Year: 2011

This paper deals with the sub-carrier and bit allocations for multi-user orthogonal frequency division multiplexing (OFDM) systems by a modified particle swarm optimization (MPSO) method for a specific bit error rate (BER). The resources (subcarriers and the number of bits per symbol per subcarrier) are allocated according to the instantaneous channel state information (CSI) which is assumed to be perfect and available with no latency and at no cost. To allocate the resources, we optimize total transmit power and throughput simultaneously with MPSO for a multi-user OFDM system. Simulation results show that for a large number of users, the MPSO performs better than existing algorithms, and that joint optimization (margin adaptive and rate adaptive) converges quickly. © 2011 IEEE.

Ahmed I.,Northern University of Bangladesh | Sadeque S.,Simon Fraser University | Pervin S.,University of Dhaka
CONIELECOMP 2011 - 21st International Conference on Electronics Communications and Computers, Proceedings | Year: 2011

Like many wireless systems, Orthogonal Frequency Division Multiplexing (OFDM) needs proper allocation of limited resources such as total transmit power and available frequency bandwidth among the users to meet their service requirements. In this paper, different versions of two evolutionary approaches, Differential Evolution (DE) and Particle Swarm Optimization (PSO) have been applied for adaptive sub-carrier and bit allocations to minimize the overall transmit power of a multiuser OFDM system. Each user will be assigned a number of sub-carriers with at least one minimum sub-carrier even at the worst case. Then the number of bits and the transmit power level for each user are calculated to obtain the optimum requirements. Simulation results show that both the approaches outperform the conventional static and many other dynamic resource allocation schemes in multi-user scenario. The results also reveal that the employed two different schemes of DE show better performances than the original and modified versions of PSO. © 2011 IEEE.

Khatun A.,Manarat International University | Rahman M.,Northern University of Bangladesh | Jahan S.,Manarat International University
Oriental Pharmacy and Experimental Medicine | Year: 2014

The methanol extract of leaves of traditionally used medicinal plant Murraya exotica Linn. (Family: Rutaceae) was evaluated for possible cytotoxic, thrombolytic and antioxidant activities in this study. The extract was tested for phytochemical group test by standard method using chromogenic reagents, in vivo brine shrimp lethality assay using Artemia salina, thrombolytic effect by using the standard streptokinase and antioxidant activity by using 2,2-diphenyl-1-picryl-hydrazyl (DPPH). The study revealed the presence of reducing sugars, tannins, saponins and alkaloids. The extract showed statistically significant (p < 0.01) potent cytotoxic effect in brine shrimp lethality bioassay where the value of LC50 and LC90 were 1.27 μg/ml and 5.09 μg/ml respectively compared with the standard vincristine sulphate with the value of LC50 and LC90 0.09 μg/ml and 4.83 μg/ml respectively after 24 h. The study gave a significant indication to the use of the plant extract as a potential source for cytotoxic compounds. The extract showed mild thrombolytic effect of 15.78 % thrombolytic activity whereas the standard streptokinase showed 76.50 ± 0.82 %. In the antioxidant activity study, the extract showed free radical scavenging activity where IC50 = 1.25 μg/ml and IC90 = 4.4 μg/ml, compared with the standard ascorbic acid showing IC50 = 0.01 μg/ml and IC90 = 3.58 μg/ml. Based on the findings of phytochemical, toxicological and anti-oxidative activity, it is evident that the plant may contain some novel compounds that possess potent anti-mutagenic and anti-oxidative activities. The obtained results support the use of this plant in traditional medicine. © 2014 Institute of Korean Medicine, Kyung Hee University.

Parvin A.,Northern University of Bangladesh
Journal of Internet Banking and Commerce | Year: 2013

Banks are playing very vital role for the economic development of a country. In this paper the picture of existing operation of mobile banking service as well as the future of this has been depicted. This is almost a descriptive study that has used both primary and secondary data. The result is showing that almost all the banks are trying to adopt mobile banking to make their customers satisfied and be advance in their world where the common services are account opening, account balance query, fund transfer and PIN related service. All the operators of mobile phone in Bangladesh have started to be involved at a greater extent in this regard. And from the viewpoint of the customers the study has inferred they are satisfied with the very few services that new banking system is giving and as a consequence the future of banking business will be brighter day by day. This paper will contribute a lot to the banks of Bangladesh for better service giving and make customers more concern to avail mobile banking service. © Afroza Parvin, 2013.

Sarker K.U.,Northern University of Bangladesh
ICECE 2010 - 6th International Conference on Electrical and Computer Engineering | Year: 2010

DNA-Computation is one of the latest inter disciplinary issues and an efficient technique to solve non-polynomial problem by polynomial time. In this paper I have showed a 5-steps design procedure of Multiplexer and Demultiplexer with DNA-Computation which is performed in a constant time for 1xn Demultiplexer and nx1 Multiplexer. Actually it is an example of top-down design procedure with DNA. ©2010 IEEE.

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