Dhaka, Bangladesh
Dhaka, Bangladesh

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Islam M.S.,Noakhali Science and Technology University | Mostofa A.G.M.,University of Dhaka | Ahmed M.U.,University of Dhaka | Sayeed M.S.B.,The University of Asia Pacific | And 2 more authors.
Tumor Biology | Year: 2014

The rate of direct smoking, second hand smoking, and smokeless tobacco users as well as the amount of environmental pollutant like polycyclic aromatic hydrocarons is increasing in Bangladesh. Therefore, the prevalence of lung cancer is increasing day by day. To the best of our knowledge, no pharmacogentic study of CYP3A4, CYP3A5 genes has been reported on Bangladeshi population relating those with lung cancer. The present study was conducted to determine the association of CYP3A4, CYP3A5 gene polymorphisms and tobacco smoking in the development of lung cancer in Bangladeshi population. A case-control study was carried out on 106 lung cancer patients and 116 controls to investigate three allelic variants - CYP3A4*1B, CYP3A5*3, and CYP3A5*6 using Polymerase Chain Reaction Restriction Fragment Length Polymorphism. Risk of lung cancer was estimated as odds ratio (OR) and 95% confidence interval (CI) using unconditional logistic regression models. The variant allele frequencies for CYP3A4*1B (*1A/*1B+*1B/*1B) were 2.83%and 0.86%and that of CYP3A5*3 (*1A/*3+*3/*3) were 88.68% and 85.34% in cases and controls, respectively. Individual carrying at least one variant allele of CYP3A4*1B (CYP3A4*1A/1B+*1B/1B) has a 3.35 times more risk (OR=3.35, 95% Cl=0.34-32.71, p =0.271) for developing lung cancer whereas individual carrying at least one variant allele of CYP3A5 (CYP3A5*1A/3+*3/3) has a 1.26 times more risk (OR=1.35, 95% Cl=0.61-2.97) and both are statistically non-significant (p >0.05). CYP3A5*6 was absent in the study population. No association of lung cancer with the mentioned polymorphisms was found both in heavy and light smokers. In the cases of all three major types of lung cancer-squamous cell carcinoma, adenocarcinoma, and small cell carcinoma-significantly strong relationships (p 0.05) have been found. To confirm the association of lung cancer with the mentioned polymorphisms, large number volunteers (patients and controls) will be required. © International Society of Oncology and BioMarkers (ISOBM) 2013.

Islam M.M.,National Cheng Kung University | Chou F.N.-F.,National Cheng Kung University | Kabir M.R.,The University of Asia Pacific | Liaw C.-H.,National Taiwan Ocean University
Water Resources Management | Year: 2010

Although Bangladesh receives plenty of rainwater during its monsoon, both rural and urban areas suffer from shortages of safe drinking water during dry season. Arsenic contamination of ground water affects many rural areas, whilst some urban areas including the capital, Dhaka City, lack sufficient potable ground water to meet the demand. To cope with the problem, this research explore: the feasibility of harvesting rainwater during monsoon as a source of quality safe drinking water in Dhaka City. A questionnaire survey was conducted about potable water shortage in four slums of Dhaka City. Rainwater was collected using a non-toxic waterproof cloth as a catchment during monsoon and stored in a ferro-cement storage tank with an initial flushing device attached at the inlet of the tank. Different important physical, chemical and bacteriological parameters were tested throughout the storage period of 4 months. The efficiency of the rainwater harvesting system increased from 51% to 80% before and after installing the system. The test results were compared with the Bangladesh water quality standards. The tests have revealed slightly higher pH value (8.1 to 8.3) and enormity of color beyond the acceptable range. Although the presence of total coliform was detected after three months, traditional filtering of that stored rainwater showed a promising solution to mitigate potable water shortages in Bangladesh. © 2010 Springer Science+Business Media B.V.

Fatemi M.N.,The University of Asia Pacific | Rahman T.,BDDL Housing LTD.
Urbani Izziv | Year: 2015

This study investigates the projected outcome of the Bangladesh government's decision to relocate the Hazaribagh tanneries outside Dhaka, the capital of Bangladesh. Ever since the early industrialisation of Bangladesh, leather processing industries have played a significant economic role. In Dhaka, these industries are mainly concentrated in Hazaribagh, an important area in the southwestern part of the city. Hazaribagh is a junction connecting the new township with the old one. However, the use of inferior technologies, coupled with the absence of proper industrial waste-management and waste-treatment facilities, have destroyed the ecology of the Hazaribagh area and badly impacted its surroundings. Consequently, moving the tanneries from Hazaribagh and then redeveloping the area offers a unique opportunity in the country's sustainable urban regeneration. Regenerating the Hazaribagh urban brownfield can serve as a model for sustainable twenty-first-century neighbourhoods, incorporating contemporary facilities and environmentally friendly elements for healthy living. This study analyses the Hazaribagh area's potential as an example of a planned sustainable area for the entire city, free from the severe pollution that it is notorious for.

Song X.,University of British Columbia | Hassan Md.Z.,The University of Asia Pacific | Cheng J.,University of British Columbia
Electronics Letters | Year: 2012

Bit error rate (BER) performance is studied for a subcarrier differential quadrature phase-shift keying modulated optical wireless communication system over the Gamma-Gamma turbulence channels. A closed-form BER expression is derived using a series expansion approach. Asymptotic analysis shows that the diversity order of the considered system depends only on the smaller channel parameter. © 2012 The Institution of Engineering and Technology.

Hassan M.Z.,The University of Asia Pacific | Song X.,University of British Columbia | Cheng J.,University of British Columbia
Journal of Optical Communications and Networking | Year: 2012

The average symbol error rate is studied for subcarrier intensity modulated wireless optical communication systems employing general order rectangular quadrature amplitude modulation. We consider three different turbulence channel models, i.e., the Gamma-Gamma channel, the K-distributed channel, and the negative exponential channel with different levels of turbulence. Closed-form error rate expressions are derived using a series expansion of the modified Bessel function. In addition, detailed truncation error analysis and asymptotic error rate analysis are also presented. Numerical results demonstrate that our series solutions are highly accurate and efficient. © 2009-2012 OSA.

Roy N.,The University of Asia Pacific | Tasnim S.,Stamford University Bangladesh | Mamun A.A.,Jahangirnagar University
Physics of Plasmas | Year: 2012

A rigorous theoretical investigation has been made on the formation of the nonlinear structures (viz., solitary waves, double layers) in a dusty electron-positron-ion plasma (containing inertialess degenerate electrons and positrons, cold, mobile, inertial ions, and negatively charged stationary dust). The pseudo potential method has been employed in this theoretical investigation. The basic features of the solitary waves and double layers, which are associated with positive ion dynamics and pressures of degenerate electrons and positrons, are identified. The co-existence of positive and negative solitary waves, and existence of either positive or negative double layers have been theoretically observed for certain range of different plasma parameters. The implications of our results in astrophysical compact objects have been briefly discussed. © 2012 American Institute of Physics.

Emura K.,Japan National Institute of Information and Communications Technology | Rahman M.S.,The University of Asia Pacific
SECRYPT 2012 - Proceedings of the International Conference on Security and Cryptography | Year: 2012

As an extension of public key encryption with keyword search (PEKS), secure channel free PEKS (SCFPEKS) has been considered. Generic construction of SCF-PEKS (with adaptive security) from strongly existentially unforgeable one-time signature, selective-tag CCA secure tag-based encryption (TBE) and anonymous identity-based encryption (IBE) has been proposed in ISC2011. Since this construction follows the double encryption, where a ciphertext of anonymous IBE is encrypted by TBE, hybrid encryption is applied because usually the ciphertext space of IBE is not equal to the plaintext space of TBE. In this paper, we show that hybrid encryption is not necessary as long as previously-known anonymous IBE schemes are used as a building tool of adaptive SCF-PEKS. Our result leads to a composability of IBE schemes whether they can be applied for constructing adaptive SCF-PEKS or not. Moreover, since we can exclude DEM part, our construction is efficient compared to the original one.

Podder J.,Bangladesh University of Engineering and Technology | Rahman A.,The University of Asia Pacific
International Journal of Optics | Year: 2010

The solubility of potassium dihydrogen phosphate (KDP) was determined for five different temperatures. Metastable zone width of aqueous solutions of KDP saturated at different temperatures was determined by nucleation method in pure form and adding a well-known chelating agent ethylenediaminetetraacetic acid (0.5mol% EDTA). The induction period was measured, experiments were performed at selected degrees of supersaturation (C/C*), and the critical nucleation parameters like interfacial energy (σ) were calculated, based on the classical theory of nucleation. The structural and optical properties of the grown crystals have been investigated. FTIR analysis has been carried out to characterize the grown crystals. Band gap has been calculated from transmission spectra. Copyright © 2010 Anisur Rahman and Jiban Podder.

Rahman A.,The University of Asia Pacific | Podder J.,Bangladesh University of Engineering and Technology
Indian Journal of Physics | Year: 2012

The pure ammonium dihydrogen phosphate (ADP) and ethylenediamine tetra acetic acid (EDTA) added ADP crystals were grown by isothermal evaporation method. The solubility of ADP was determined for five different temperatures. Metastable zone width of aqueous solutions of ADP saturated at different temperatures was determined by nucleation method in pure form and adding with 0.5 mol.% EDTA. The induction period τ was measured and experiments were performed at selected degrees of supersaturation (C/C*) and the critical nucleation parameters like interfacial energy (σ), energy of formation of the critical nucleus (ΔG*) were calculated based on the classical theory of nucleation. The grown crystals have been subjected to study the structural, optical and mechanical properties. FTIR analysis has been carried out to characterize the grown crystals. The transmission spectra from (100) planes of the grown crystals show that the transmission increases from 55.86 to 83.23% due to addition of EDTA in the visible region and band gap was found to increase from 1.31 to 1.41 eV. The microhardness test was carried out on (100) plane. The load dependent hardness and work hardening coefficient were measured. © 2012 Indian Association for the Cultivation of Science.

Sarker M.,The University of Asia Pacific
Proceedings of the 2016 IEEE International Conference on Wireless Communications, Signal Processing and Networking, WiSPNET 2016 | Year: 2016

Cognitive radio is now come into attention for researchers as a new solution to face the challenge of the fast growing bandwidth demand. Spectrum sensing is a major problem for dynamic spectrum management in cognitive radio networks. This paper introduces a simple Hilbert transform based approach for efficient spectrum sensing of wideband channel in which soft de-noising is used to suppress the noise level. In this approach the effect of noise is suppressed first by averaging PSD of the received signal then de-noised by soft thresholding. Frequency boundaries of bands are found more accurately by Hilbert transform which is shown in simulation result so it will also ease to characterize by vacant or occupied by determining the average PSD of the consecutive bands. Our proposed method has also improved performance of detection in low SNR region than the conventional methods which is also portrayed by simulation result. © 2016 IEEE.

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