Zahurul Islam - Academia.edu (original) (raw)

Papers by Zahurul Islam

Journal for Language Technology and Computational Linguistics

Ancient corpora contain various multilingual patterns. This imposes numerous problems on their ma... more Ancient corpora contain various multilingual patterns. This imposes numerous problems on their manual annotation and automatic processing. We introduce a lexicon building system, called Lexicon Expander, that has an integrated language detection module, Language Detection (LD) Toolkit. The Lexicon Expander post-processes the output of the LD Toolkit which leads to the improvement of f-score and accuracy values. Furthermore, the functionality of the Lexicon Expander also includes manual editing of lexical entries and automatic morphological expansion by means of a morphological grammar.

Thermal Science and Engineering Progress

International Journal of Thermofluids

Nanoparticle is highly used in enhancing thermal performance, especially in lid-driven cavity flo... more Nanoparticle is highly used in enhancing thermal performance, especially in lid-driven cavity flow in powderrelated applications. Many researchers considered different conditions, such as MHD, radiation, and mixed convection incorporating nano liquid in such flow. However, no study was carried out with CNT-water nano liquid in a triangular cavity, heated sinusoidally under natural convection to determine the Rayleigh number (Ra) and nano-powder liquid concentration effect on heat transfer. As a result, this study attempts to find the Rayleigh number and particle concentration effects in such transient cavity flow. The governing equations were employed with the Galerkin residual method. While calculating the thermal conductivity and dynamic viscosity of the nano liquid, Brownian motion was taken into consideration. The four solid volume fractions (0.01, 0.05, 0.1, 0.15) and the Ra (10 4 ≤ Ra ≤ 10 6) were chosen to evaluate the impact within dimensionless time (0.1 ≤ τ ≤ 1). The findings have been shown by plotting the streamlines, isotherms, heat transfer variation, and pressure gradient. It is found that when the Rayleigh number goes up, the velocity, vorticity, and pressure gradient magnitude become high. But, the fluid flow vortices decrease with dimensionless time. Due to the sinusoidal heat flux conditions, the variation of the result was found to be sinusoidal as well. When the nanoparticle concentration rises, the heat transfer rate and average fluid temperature also increase. Therefore, the highest heat transfer rate is found using the nano liquid with a15% concentration.

Computational and Mathematical Methods in Medicine

In this article, we have developed a deterministic Susceptible-Latent-Infectious-Recovered (SLIR)... more In this article, we have developed a deterministic Susceptible-Latent-Infectious-Recovered (SLIR) model for diphtheria outbreaks. Here, we have studied a case of the diphtheria outbreak in the Rohingya refugee camp in Bangladesh to trace the disease dynamics and find out the peak value of the infection. Both analytical and numerical investigations have been performed on the model to find several remarkable behaviors like the positive and bounded solution, basic reproductive ratio, and equilibria such as disease extinction equilibrium and disease persistence equilibrium which are characterized depending on the basic reproductive ratio and global stability of the model using Lyapunov function for both equilibria. Parameter estimation has been performed to determine the values of the parameter from the daily case data using numerical technique and determined the value of the basic reproductive number for the outbreak as R 0 = 5.86 .

Results in Engineering, 2022

This research examines the natural convection phenomena in a triangular enclosure, assumed as a m... more This research examines the natural convection phenomena in a triangular enclosure, assumed as a mechanical chamber. Water-based CNT-nanofluid was used as the fluid. The nature of the flow is unsteady, and a sinusoidal heat source is situated at the bottom of the triangle. The inclined two walls of the triangle are assumed as cold temperature. Based on the finite element method, dimensionless nonlinear governing equations were obtained employing the Galerkin weighted residual method. Brownian motion of nanoparticles was considered to determine the thermal conductivity and dynamic viscosity. Rayleigh number (Ra), oscillation period τ p , and dimensionless time τ are assumed as primary controlling factors, and nanofluid concentration is considered as constant φ = 0.04. The result indicates that the heat transfer rate displays varied patterns varying the Rayleigh number, and it rises as the oscillation period increases. The fluid temperature and flow fields exhibit periodic behavior due to the sinusoidal heat source. The findings of this work can be utilized to build an effective cooling or heating system for the mechanical chamber, ensuring that temperature distributions are effective and consistent.

Journal of irrigation engineering and rural planning, 1994

The study presents the results of case histories on failure of embankments in Bangladesh based on... more The study presents the results of case histories on failure of embankments in Bangladesh based on the field visits to the embankments sites, collected data and information on failure of embankments necessary data related to embankments construction practice obtained from available publications and soil conditions of the breached embankments in Bangladesh. Efforts have been made to discuss briefly the causes of embankment failure and its possible remedial measures. Two recent failures of embankments that occurred in the year 2007 are taken into consideration for a detailed study. For each case, embankment failure mechanism, construction method used for the embankments, soil conditions, embankment geometry and water levels are collected and analyses are made for slope stability with and without water storage conditions. Soil samples collected during field visits are analyzed. On the basis of the results of analyses and discussions, it is concluded that the major causes of failure of earlier embankments are identified as breach of the embankment, cutting by public, overflow, erosion, seepage and sliding. Other causes were poor planning, design and faulty construction. The cause of failure of all the flood control embankments in the year 2007 could be attributed to erosion and sliding of embankment materials due to river encroachment and mitigation. Slope stability analyses of the Padma and Jamuna flood control embankments revealed that the country side slopes of both the embankments are not at all stable during the monsoon when the water level is high. The Jamuna flood control embankment is not stable even before and after the monsoon period because the factor of safety calculated for the country side slopes are less than that of the recommended one. Of the two cases studied detailed in this research articles, it is observed that there are substantial differences between the cross sections shown in the actual designs that existed near to the failure locations. A close investigation of the above two cases indicates that no protective measures such as mattressing, stone pitching, concrete layers, artificial or natural reinforcement like grassing, soil-cement layer are made to prevent the embankments from rain splash, water current, waves, storm surges, and other natural calamities and destructive forces. It is recommended that the embankments should be constructed by following the proper design and construction procedure, and be protected by using some forms of reinforcements or surface covering/treatment.

Proceedings of the Third International Workshop on Cross Lingual Information Access Addressing the Information Need of Multilingual Societies - CLIAWS3 '09, 2009

For many languages, the size of Wikipedia is an order of magnitude smaller than the English Wikip... more For many languages, the size of Wikipedia is an order of magnitude smaller than the English Wikipedia. We present a method for cross-lingual alignment of template and infobox attributes in Wikipedia. The alignment is used to add and complete templates and infoboxes in one language with information derived from Wikipedia in another language. We show that alignment between English and Dutch Wikipedia is accurate and that the result can be used to expand the number of template attribute-value pairs in Dutch Wikipedia by 50%. Furthermore, the alignment provides valuable information for normalization of template and attribute names and can be used to detect potential inconsistencies.

The paper describes a procedure for the automatic generation of a large full-form lexicon of Engl... more The paper describes a procedure for the automatic generation of a large full-form lexicon of English. We put emphasis on two statistical methods to lexicon extension and adjustment: in terms of a letter-based HMM and in terms of a detector of spelling variants and misspellings. The resulting resource, ColLex.EN, is evaluated with respect to two tasks: text categorization and lexical coverage by example of the SUSANNE corpus and the Open ANC.

This paper presents a classifier of text readability based on information-theoretic features. The... more This paper presents a classifier of text readability based on information-theoretic features. The classifier was developed based on a linguistic approach to readability that explores lexical, syntactic and semantic features. For this evaluation we extracted a corpus of 645 articles from Wikipedia together with their quality judgments. We show that information-theoretic features perform as well as their linguistic counterparts even if we explore several linguistic levels at once.

Many news papers publish articles for children. Journalists use their experience and intuition to... more Many news papers publish articles for children. Journalists use their experience and intuition to write these. They might not aware of readability of articles they write. There is no evaluation tool or method available to determine how appropriate these articles are for the target readers. In this paper, we evaluate difficulty of Bangla news articles that are written for children.

Lecture Notes in Computer Science, 2014

Readability classification is an important application of Natural Language Processing. It aims at... more Readability classification is an important application of Natural Language Processing. It aims at judging the quality of documents and to assist writers to identify possible problems. This paper presents a readability classifier for Bangla textbooks using information-theoretic and lexical features. All together 18 features are explored to achieve an F-score of 86.46%. The paper is an extension of our previous work [1].

Background and Objectives: The impaired pressor response in patients with cirrhosis of the liver ... more Background and Objectives: The impaired pressor response in patients with cirrhosis of the liver may have implications for the pathogenesis and treatment of the hyperdynamic circulation associated with this condition. Studies in patients and animal models have not elucidated the cause(s) of this abnormality in the vasculature. A small number of studies have demonstrated impaired adrenoceptormediated contraction in hepatic arteries isolated from patients with cirrhosis. However, although use of animal models has suggested that responses to other vasoconstrictor agonists may also be altered in cirrhosis, this has not been addressed using the human hepatic artery. The aims of this thesis were (i) to assess the effect of cirrhosis on the responses of human hepatic artery to three vasoconstrictor agonists, arginine vasopressin (AVP), 5-hydroxytryptamine (5-HT) and endothelin-1 (ET-1), which may contribute to the development of the hyperdynamic circulation and (ii) to clarify the mechanism(s) of any abnormality detected. Methods: Vascular responses were investigated in vitro using organ bath methodology. Method development was performed using porcine splanchnic arteries. The suitability of using hepatic arteries from liver donors as controls was also assessed by exposing porcine hepatic arteries to preservative solutions. Hepatic arteries from liver recipients (cirrhotic), and age and sex matched liver donors (noncirrhotic), were studied. The presence of the endothelium was assessed functionally, histologically and immunohistochemically. Cumulative concentration-response curves to AVP, 5-HT, ET-1 and KC1 were constructed in denuded hepatic arteries. The receptors responsible for agonist-mediated contraction were identified by performing concentration-response curves following exposure of the arteries to appropriate antagonists. Furthermore, the influence of nitric oxide synthase (NOS) activity was assessed using immunohistochemistry and functionally using an appropriate inhibitor. 111 Results: The endothelium was shown to be damaged considerably in isolated human and porcine hepatic arteries; hence, all subsequent studies used denuded vessels. The protocol developed using porcine hepatic arteries demonstrated that preservative solutions had no effect on contractile function but did alter endothelium-independent relaxation. Responses to vasoconstrictors were altered in arteries from patients with hepatic cirrhosis although the nature of this alteration was agonist-dependent: the maximum contraction to AVP was impaired whilst that to 5-HT was augmented. In contrast, the sensitivity of response to ET-1 was increased, whereas KCl-mediated contraction was unchanged. The contractile responses to AVP, 5-HT and KC1 were unaffected by NOS inhibition. There was no immunoreactivity for iNOS in donor hepatic arteries nor in those from most patients: low levels of iNOS were only detected in arteries from patients with alcoholic liver disease. Use of antagonists demonstrated that AVP and ET-1 contracted human hepatic arteries via the Vi and ETa receptors, respectively, whilst 5-HT acted predominantly via 5-HTi-like receptors with a small contribution from the 5-HT2a subtype. Conclusions: These studies demonstrated that cirrhosis of the liver is associated with an agonist-selective alteration of receptor-mediated contraction in denuded human hepatic arteries. Inducible nitric oxide synthase activity did not contribute to these alterations and unaltered responses to KC1 suggest that these abnormalities are not due to structural changes in the vessel wall. These results indicate, therefore, that altered contractile functions in hepatic arteries from patients with cirrhosis are due to changes in receptor activity and/or post-receptor signal transduction pathways. iv DECLARATION I hereby declare that the work presented in this thesis is my own and has not been submitted previously for any degree. This work was undertaken in the Liver

Photogrammetric Engineering & Remote Sensing, 2005

The research discussed in this paper evaluates the performance of selected fuzzy operators (e.g.,... more The research discussed in this paper evaluates the performance of selected fuzzy operators (e.g., maximum, minimum, algebraic sum, algebraic product, and gamma operators) for integrating fuzzy membership values associated with multiple spectral bands for mapping the complex spatial mixture that characterises urban land covers. Accordingly, a supervised classification approach based on the fuzzy c-means algorithm was implemented to generate fuzzy memberships of selected bands (1, 3, 4 and 7) of a Landsat-7 ETMϩ image that provided the highest spectral separability among different urban land covers (e.g., forest, grassland, urban, and dense urban) as determined by a transformed divergence analysis. Maps resulting from the application of each fuzzy operator were evaluated against field data. The results show that the fuzzy algebraic product and the fuzzy gamma operators (0.1 to 0.8) are optimal for integrating the fuzzy memberships of selected urban land covers on multi-band data sets, as they exhibited a K hat statistic of 75 percent as compared to a K hat statistic of 59 percent, 64 percent and 71 percent for maximum, minimum and fuzzy algebraic sum, respectively.

Asian Journal of Plant Sciences, 2003

This research presents models for the analysis of textural and contextual information content of ... more This research presents models for the analysis of textural and contextual information content of multiscale remote sensing to select an appropriate scale for the correct interpretation and mapping of heterogeneous urban land cover types. Spatial complexity measures such as the ...