Chittagong University of Engineering & Technology

About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Computer science & Renewable energy. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.

Design an Empirical Framework for Sentiment Analysis from Bangla Text using Machine Learning

Abstract: Natural Language Processing (NLP) lends a helping hand for programming the computers to inspect a huge amount of data. Sentiment analysis is an application of NLP which deals with data to examine the sentiment or opinion that can be either positive or negative. Using Bangla text, sentiment analysis has become a challenge as there were only few works on it. As a decision maker, sentiment extrication not only capturing consumer attitudes but also helps in social behavior observance, politics and policy making. This paper quantifies total positivity and negativity against a document or sentence using Random Forest Classifier to classify sentiments. We contemplate the use of unigram, POS tagging, negation handling and classifier.

Heavy metal pollution status and health risk assessment vicinity to Barapukuria coal mine area of Bangladesh

Abstract: Study related to pollution and subsequence health risk assessment adjacent to coal mining region is indispensable since coal mining and combustion have adverse impacts on the soil, subsoil, and plants in the surrounding area with a threat to human health and ecosystem. This study assesses the heavy metal pollution in water and soil as well as uptake in several parts of paddy plants over the three seasons around the year in the vicinity of the Barapukuria coal mine in Bangladesh, with the ultimate goal of estimating human health risks from eating the rice grown in this area. Enrichment factor (EF), pollution load index (PLI), geo-accumulation index (Igeo) and biological accumulation factor (BAF) were estimated for quantifying the pollution status in soils and plants. Collected samples were prepared and analysed by using USEPA recommended methods. PLI showed that soils irrigated by coal mine water were highly polluted by Ni, Fe, and Cr metals. The Igeo indicated that the soil in the study area was moderately contaminated by Cu, Zn and Ni. Amongst all types of samples, soil was found with the highest pollution followed by roots, stems, and grains; however, bioaccumulation was not evident. In the three varieties of rice grains tested, Zn and Fe were present with the highest concentrations. Through the rice grain, people in the area are ingesting Fe in the highest amounts and Cr with the lowest. Even though the concentration of Cr is low it is still above the oral intake level as recommended by USEPA.

Anti-theft protection of vehicle by GSM & GPS with fingerprint verification

Abstract: Recently vehicle tracking system is getting vast popularity because of the rising number of the stolen vehicles. Vehicle theft is happening on parking and sometimes driving in unsecured places. This research work explores how to avoid this kind of stealing and provides more security to the vehicles. The implemented system contains single-board embedded system which is equipped with global system for mobile (GSM) and global positioning system (GPS) along with a microcontroller installed in the vehicle. The use of GSM and GPS technologies allows the system to track the object and provides the most up-to-date information about on-going trips. Moreover, fingerprint verification is done in the implemented system to ensure the driving of correct person. The implemented system is very simple with greater security for vehicle anti-theft protection and low cost technique compared to others.

Newly synthesized MAX phase Zr2SeC: DFT insights into physical properties towards possible applications

Abstract: A DFT study of the synthesized MAX phase Zr2SeC has been carried out for the first time to explore its physical properties for possible applications in many sectors. The studied properties are compared with prior known MAX phase Zr2SC. The structural parameters (lattice constants, volume, and atomic positions) are observed to be consistent with earlier results. The band structure and density of states (DOS) are used to explore the metallic conductivity, anisotropic electrical conductivity, and the dominant role of Zr-d states to the electrical conductivity at the Fermi level. Analysis of the peaks in the DOS and charge density mapping (CDM) of Zr2SeC and Zr2SC revealed the possible variation of the mechanical properties and hardness among them. The mechanical stability has been checked using elastic constants. The values of the elastic constants, elastic moduli and hardness parameters of Zr2SeC are found to be lowered than those of Zr2SC. The anisotropic behavior of the mechanical properties has been studied and analyzed. Technologically important thermodynamic properties such as the thermal expansion coefficient (TEC), Debye temperature (ΘD), entropy (S), heat capacity at constant volume (Cv), Gruneisen parameter (γ) along with volume (V) and Gibbs free energy (G) are investigated as a function of both temperature (from 0 to 1600 K) and pressure (from 0 to 50 GPa). Besides, the ΘD, minimum thermal conductivity (Kmin), melting point (Tm), and γ have also been calculated at room temperature and found to be lowered for Zr2SeC compared to Zr2SC owing to their close relationship with the mechanical parameters. The value of the ΘD, Kmin, Tm, and TEC suggest Zr2SeC as a thermal barrier coating material. The optical properties such as dielectric constant (real and imaginary part), refractive index, extinction coefficient, absorption coefficient, photoconductivity, reflectivity, and loss function of Zr2SeC are computed and analyzed to reveal its possible applications.