Browsing by Author "Hasan, Md. Rabiul"

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Conspiracy Detection by Real Time Email Analysis
(Daffodil International University, 2018-10) Hasan, Md. Rabiul; Islam, Md. Tarikul; Ferdous, Most. Jannatul
In this thesis, we have proposed a method to turn this psychological concept into a machine that can automatically detect the conspiracy among the employee by analyzing their email data in real time. Here we have proposed the design using vector based classification method for analyzing the text data. We have used TFIDF method to victimization and prioritize the frequency of conspiracy related word and concept. And also we used Logistic Regression, a prediction based classifier to classify the text sentiment. Supervised vector-based methods to sentiment can design rich lexical meanings. This method for machine learning is largely used in present days. Sentiment analysis for online text document has been a burgeoning field of text mining among researchers for the past few decade. Nevertheless and sentiment analysis on Email data, a ubiquity means of social network and communication, has been studied thoroughly. Email has become the most popular communication tools for official purpose. Almost every private company uses their own mail server for exchanging their official mail. So, it has a great significance in terms of business and communication. In the other hand conspiracy is a social concept that has also a great importance and impact over the working place. It is a pure psychological concept. It influences in the progress of any working place.
Design And Implementation Of Long Range Spy Robot
(Department of Electrical and Electronic Engineering, 2018-05) Hasan, Mohammad Rafiqul; Hasan, Md. Rabiul
With the sophisticated technological advancement nowadays robotics has become a hot field for research. Robots are now used by military forces for reducing risk of their causalities and to defeat their enemies. The major focus of this project is the use of robot in war, peace and as well as their impact on society. Here DTMF signals are used for robot control system. Night vision monitoring system has been added which will capture and transmit the information surrounding the robot to the operator. With this feature the robot can not only transmit real time videos with night vision capabilities but cannot also be identified by the enemies in war zone. A metal detector and GSM module has also been added which will inform us about any bomb underneath the robot vehicle and the location of the robot. The existing sensors in the robot are able to monitor the weather of the robots location. In this paper, Mobile operated Long range spy Robot is a small robot designed for long range surveillance and inspection purpose.
Design of a single-mode photonic crystal fibre with ultra-low material loss and large effective mode area in THz regime
(IET Digital Library, 2017-08-29) Ahmed, Kawsar; Paul, Bikash Kumar; Chowdhury, Sawrab; Sen, Shuvo; Islam, Md. Ibadul; Islam, Md. Shadidul; Hasan, Md. Rabiul; Asaduzzaman, Sayed
A novel low-loss photonic crystal fibre (PCF) has been suggested for THz spectral applications. The proposed PCF contains five layers cladding with three layers core. The cladding and core region of the fibre are arranged in the octagonal and porous manner, respectively, where both the core and cladding vicinity are constituted by circular air cavities. The optical properties of the PCF are investigated by utilising the full vectorial finite-element method along with the perfect match layers boundary condition. All numerical outcomes show the ultra-low effective material loss of 0.049 cm -1 and large effective area of 3 × 10 -7 m 2 at 1 THz operating frequency. The power fraction is also considered as another significant parameter to design a low loss fibre. The almost more than half of the useful power (about 53.78% at f = 1 THz) goes through the core over the wider operating frequency. In addition this, the proposed single-mode PCF can be fabricated using the sol-gel method and is useful not only for high data traffic transmission applications but also for THz waveguide applications. Full Text Link: http://dx.doi.org/10.1049/iet-opt.2017.0028
Highly birefringent single mode spiral shape photonic crystal fiber based sensor for gas sensing applications
(Elsevier, 2017-04-21) Islam, Md. Ibadul; Paul, Bikash Kumar; Ahmed, Kawsar; Hasan, Md. Rabiul; Chowdhury, Sawrab; Islam, Md. Shadidul; Sen, Shuvo; Bahar, Ali Newaz; Asaduzzaman, Sayed
This article represents a gas sensor based on spiral photonic crystal fiber (S-PCF) for detecting harmful or colorless gasses and monitoring air pollution by metering gas condensate elements in production facilities. The proposed micro-structured S-PCF contains two layers porous core encircled by a spiral shape cladding. The geometrical parameters are tuned to fix the optimized S-PCF structure. The numerical analysis of the proposed S-PCF is performed by utilizing finite element method (FEM) with circular perfectly match layer (C-PML). The relative sensitivity and birefringence of the recommended structure are 57.61% and 7.53 × 10− 3 respectively at 1.33 μm wavelength on the absorption line of toxic gasses (methane and hydrogen fluoride). The exhibited beam divergence is about 4.1° at the same wavelength. Besides, beat length, nonlinear coefficient, effective area and V parameters are also described briefly for optimized S-PCF structure over broader wavelength range from 1 μm to 1.8 μm. Full Text Link: https://doi.org/10.1016/j.sbsr.2017.04.001
Low-Loss Single Mode Terahertz Microstructure Fiber with Near-Zero-Flattened Dispersion
(Ingenta Connect, 2017-10-01) Ahmed, Kawsar; Islam, Md. Ibadul; Sen, Shuvo; Paul, Bikash Kumar; Islam, Md. Shadidul; Chowdhury, Sawrab; Hasan, Md. Rabiul; Uddin, Muhammad Shahin; Asaduzzaman, Sayed; Bahar, Ali Newaz
Proposed Square Lattice Photonic Crystal Fiber for Extremely High Nonlinearity, Birefringence and Ultra-High Negative Dispersion Compensation
(De Gruyter, 2017-07-20) Islam, Md. Ibadul; Ahmed, Kawsar; Sen, Shuvo; Paul, Bikash Kumar; Islam, Md. Shadidul; Chowdhury, Sawrab; Hasan, Md. Rabiul; Uddin, Muhammad Shahin; Asaduzzaman, Sayed; Bahar, Ali Newaz
A photonic crystal fiber in square lattice architecture is numerically investigated and proposed for broadband dispersion compensation in optical transmission system. Simulation results reveal that it is possible to obtain an ultra-high negative dispersion of about −571.7 to −1889.7 (ps/nm.km) in the wavelength range of 1340 nm to 1640 nm. Experimentally it is demonstrated that the design fiber covers a high birefringence of order 4.74×10‒3 at the wavelength of 1550 nm. Here, numerical investigation of guiding properties and geometrical properties of the proposed PCF are conducted using the finite element method (FEM) with perfectly match layers. Moreover, it is established more firmly that the proposed fiber successfully compensates the chromatic dispersion of standard single mode in entire band of interest. Our result is attractive due to successfully achieve ultra-high negative dispersion that is more promisor than the prior best results. Full Text Link: https://doi.org/10.1515/joc-2017-0095
Risk Assessment for Urban water Supply in a developing Country: a case study of Dhaka City
(Department of Civil and Environment Engineering, Islamic University of Technology(IUT), Board Bazar, Gazipur, Bangladesh, 2014-11-15) Rahman, S.M. Anik; Hasan, Md. Rabiul
Water supply access in most developing countries like Bangladesh is complex. Expanding safe drinking water and sanitation services would drastically cut the loss of life from water-related illness and free up scarce health resources in developing countries. According to the UN-Water report (2008) five thousand children die each day from diarrhoea alone or one every 17 seconds. Upgrading water supply and sanitation services based on risk assessment can reduce vulnerability of people being affected by water borne diseases. In quantitative risk assessment, an attempt is made to numerically determine the probabilities of various adverse events and the likely extent of the losses if a particular event takes place. Risks can be identified at various stages, and prioritized in terms of likelihood and seriousness (ADB, 2010). A risk-ranking matrix should be developed to address both likelihood and severity. Most approaches use some form of semi-quantitative ranking system by allocating numbers to different levels of likelihood and different levels of severity. A risk score is then calculated by multiplying these two numbers together as shown : Risk = Likelihood * Severity. For the purpose of risk analysis of different zone of Dhaka city, we collect leakage value of different zones of previous 7years (2007,2008, 2009,2010,2011,2012,2013). Then we plot the data in graph for determine the monthly variation of leak for various zones of Dhaka city. Then we find out the average of leakage of each zone for different years. Then we create a risk analysis matrix from the weighting value of leakage and number of connection for risk ranking .We found that zone 4 is at higher risky position. From DWASA we know that zone 4 is included area Agargoan,West Agargoan, East Symoli,kallanpor, Paekpara,Pererbag,Taltola,West Sewreapara, West Kazipara. Some reasons behind this : Unplanned urbaniztion, Densly popullated, Narrow roads, Poor sewerage system, Lack of mintainance, Old pipe. Some risk reduction options for zone 4 are: Regular maintenance, Replacing old age pipe, Regular water quality test , Less joint in the pipe, Take proper safety when other construction works is done near to the pipe line ,Public awareness. We measured risk only for leakage. Further risk should be measured from pipe age, pipe diameter , pipe length and jointing , pipe material. We measured severity from the number of connection .Further if population data can be found then risk analysis can be more accurate.
Ultra-low Loss with Single Mode Polymer-Based Photonic Crystal Fiber for THz Waveguide
(De Gruyter, 2017-09-02) Sen, Shuvo; Islam, Md. Shadidul; Paul, Bikash Kumar; Islam, Md. Ibadul; Chowdhury, Sawrab; Ahmed, Kawsar; Hasan, Md. Rabiul; Uddin, Muhammad Shahin; Asaduzzaman, Sayed
In this article, a low loss circular photonic crystal fiber (C-PCF) has been suggested as Terahertz (THz) waveguide. Both the core and cladding vicinity of the suggested PCF are constituted by circular-shaped air holes. The optical properties such as effective material loss, effective area, core power fraction and V-parameter have numerically been probed by utilizing full vectorial finite element method (FEM) with perfectly matched layers (FMLs) boundary condition. The reported PCF reveals low absorption loss and large effective area of 0.04 cm−1 and 2.80×10−07 m2 respectively at 1 THz operating frequency. In addition, the core power fraction of the fiber is about 50.83 % at the same activation frequency. The V-parameter shows that the proposed PCF acts as a single mode over 0.70 to 1.15 THz frequency. So, the reported PCF offers the best performance in long distance communication applications. Full Text Link: https://doi.org/10.1515/joc-2017-0104