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.

Bifurcation analysis with chaotic motion of oblique plane wave for describing a discrete nonlinear electrical transmission line with conformable derivative

Abstract: The present work discusses the basic features of bifurcation properties with chaotic motion of oblique plane wave in the discrete nonlinear electrical transmission lines having conformable derivative evolution. The planar dynamical systems are obtained to understand such physical issues for this model. In addition, the analytical plane wave solutions of nonlinear mathematical leading equation are determined by using two different mathematical methods. Both methods are supported only by the shock plane wave solutions. The conditions for other types of oscillatory plane wave solutions are also determined. The effect of obliqueness on the bifurcation properties, chaotic motion and shock plane waves structures are focused graphically with discussions by considering both of locality and non-locality in the system. It is found that the parameter of non-local operator is only affected on the nonlinear shock wave phenomena, whereas all basic features of discrete nonlinear electrical transmission line are changed with the changes of obliqueness.

Location based ATM locator system using OpenStreetMap

Abstract: Money transaction through ATM machine wherever we go has become phenomenon in our day-to-days activities as it is safe to keep a ATM card rather than keeping cash. When we need cash in any unknown area or during any emergency situation, we need to know about nearest ATM booth from where we can avail this opportunity. In addition, a tourist or new comer may face difficulty in having ATM help without this information. Hence, we have proposed a location based ATM locator system (LBALS) using OpenStreetMap, a growing open source digital map where ATM booths and fast tracks are mapped. Database contains detail information about all available ATM booths and fast tracks of different banks. It requires GPS supported android device with application installed on it for the user. Textual information are provided of nearest ATM booths or fast tracks from user's current position when he requires the information. Some Markers indicate ATM booths or fast tracks on the map. Dijkstra's algorithm has been applied to show the possible shortest path between user and an ATM booth. Haversine formula is also used to calculate perpendicular distance. Implemented LBALS is tested for some random locations in a specific region of our country.

R 3 HMS, An IoT Based Approach for Patient Health Monitoring

Abstract: Present tradition of Internet of Things (IoT) employed in healthcare services are not suitable in developing countries like Bangladesh due to the complexity, technical difficulty in maintenance and astronomical price tag. In order to fill this gap, this paper presents R3HMS(Remote Reliable and Real-time Health Monitoring System), an approach a to low cost, easy to maintain and easy to install IoT-based health monitoring system for 24 hours continuous screening of patients which can be employed in both large hospitals in urban area as well as in resource limited hospitals in rural areas. The system measures patients physiological signals like ECG, respiratory airflow and SpO2 and sends these extracted data to a remote server. ESP8266 Wi-Fi chip is chosen for wireless communication and an 8-bit MCU ATmega328p is used to accumulate and process data to reduce load on the ESP8266. With the help of Amazon Web Services(AWS)data is securely transferred between devices using MQTT messaging protocol. These data can be viewed and analyzed by specialists, doctors and other paramedical staffs in real-time to monitor patient’s state.

Nonlinear propagation of weakly relativistic ion-acoustic waves in electron–positron–ion plasma

Abstract: This work presents theoretical and numerical discussion on the dynamics of ion-acoustic solitary wave for weakly relativistic regime in unmagnetized plasma comprising non-extensive electrons, Boltzmann positrons and relativistic ions. In order to analyse the nonlinear propagation phenomena, the Korteweg–de Vries (KdV) equation is derived using the well-known reductive perturbation method. The integration of the derived equation is carried out using the ansatz method and the generalized Riccati equation mapping method. The influence of plasma parameters on the amplitude and width of the soliton and the electrostatic nonlinear propagation of weakly relativistic ion-acoustic solitary waves are described. The obtained results of the nonlinear low-frequency waves in such plasmas may be helpful to understand various phenomena in astrophysical compact object and space physics.

CPU power consumption reduction in android smartphone

Abstract: Despite the growing popularity of smartphones, it's extensive power consumption is still now a burning issue. In this regard, we propose and evaluate a system of CPU power consumption reduction which supports Dynamic Voltage and Frequency Scaling (DVFS) and User Driven Frequency Scaling (UDFS) at the same time. At first, a DVFS is used to scale the frequency level continuously based on loads present at that time. Then a UDFS is used to consider user satisfaction. Starting from the highest frequency level, UDFS gradually reduces the frequency level until users feel discomfort. The proposed technique calculates an optimum frequency as the starting frequency and then reduces that frequency until user shows discomfort. When CPU reaches in ideal state, processor frequency goes to the lowest level to save battery life. Our proposed technique is implemented in Samsung Galaxy S2 and it reduces 25% power consumption compared to default DVFS and 3% than existing UDFS technique.