Although economy of the 21st century is exceedingly reliable on industrialization, agriculture works as an unavoidable driving force for economic growth of the country like Bangladesh where advancement of wireless technologies, computational techniques and system engineering have rendered new opportunities to promote our existing agricultural system. This paper work depicts the design and implementation of a solar energy based precision agriculture (PA) with wireless sensory network (WSN) via Internet of Things (IoT) architecture to meet the demand of finding highly efficient methods for smart agricultural monitoring and management system. Our proposed system will provide valuable data about salt water intrusion, soil moisture, water level, humidity, temperature as well as the general condition of the crop field to the farmers in a user friendly, easily accessible manner with real time data communication via IoT. We can monitor the crop field conditions by using smartphone and will be able to take the necessary steps remotely on the basis of present conditions. We have utilized our proposed system and collected experimental data from south-western and southeastern part of Bangladesh.

The intention of designing a robot is to facilitate the human beings through giving security and working as a helping hand through reprieving. The technology used in this rescue and security robot has a number of important features such as robotic car control by cell phone, automatically avoiding obstacles in its way. It can sense gas, smoke and provide an alert through text messaging. The robot can detect bombs, pick and place objects and also do distance measurements. A high quality wireless video camera equipped with a stepper motor for the omni-directional view is used for the spying purpose which is mounted on the robo car to send real video images and audio signals. These audio and video stream received by the receiver unit can be used to take proper steps according to the received signals. This robot can also be used to reach places where humans cannot reach like hidden places, small tunnels. The ultimate focus of this system is to offer far possible security for the human being. In this paper, we have illustrated our work by using the entire sub modules.

In a network topology, it is very usual to use various kinds of routing protocol for forwarding packets. A routing table is used in the memory of a router that keeps the track of routes to particular network destination and the most popular routing algorithms used to forward packets are Routing Information Protocol (RIPv2), Enhanced Interior Gateway Routing Protocol (EIGRP) and Open Shortest Path First (OSPF). The ultimate concentration of this research work is to depict the performance analysis comparison of these three dynamic routing protocols and redistribution among the protocols. Eight Cisco routers and a switch are used in our simulated network topology where four routers with different protocols directly connected with the switch take the responsibility for the redistribution algorithm.

In this study, we propose a promising 5 mm long air-clad suspended core channel waveguide made of As ₂ Se ₃ chalcogenide glass for ultra-broadband supercontinuum generation (SCG) in the mid-infrared (MIR). The linear analysis of the proposed waveguide is carried out numerically by considering the potential application of pump sources at three different wavelength regions such as 1.55, 2.8, and 3.5 µ m. Among several waveguide geometries analyzed, numerical simulation for SCG at the output of an optimized structure shows that a flat supercontinuum coverage from 1.5 to 15 µ m can be predicted using a pump at 3.5 µ m with a moderate peak power of 2000 W. To the best of the authors’ knowledge, this would be the broadest spectra in the MIR by the suspended planar waveguide design. In addition, waveguide structural imperfection has also been discussed as it is difficult to control the waveguide dimensions during the fabrication process precisely. The effect of possible deviations along the transverse dimensions is rigorously analyzed and an imperfection among the several deviations is found which could lead to a substantial supercontinuum bandwidth reduction at the waveguide output. Finally, the degree of coherence of the obtained supercontinuum coverage is also tested and it has been achieved nearly coherent spectral outcome from the proposed suspended waveguide design.

This paper represents a system “3rd HAND”, that can serve a disable person or elder person to perform some of their regular tasks without any helping hand. This system helps a person to switch the regular home loads (light, fan etc.) using his voice commands and his location can be tracked when he travels outside alone with the system. In self-regulated system we used an EASY_VR voice recognition module. The recognized control commands are sent to an ARDUINO for proper program controlling and then to a Bluetooth module. After that, the commands are routed to the target device over Bluetooth network and finally carried out by the control circuit. In GPS tracking system, we used the GPS and SMS services of an android mobile phone. When a client sends a request SMS to the system to get its location, the GPS receiver of the phone calculates the location coordinates and converts it to location name using GEOCODING API. Finally the location name is sent to the client automatically. Generally it is not comfortable and secured for a disabled or elder person to switch their home loads and to travel alone. So the system “3rd hand” provides them a safety switching system and supports them to travel independently in safe.

Solar power satellite (SPS) is a renewable and infinite energy system in the Geostationary Earth Orbit, which works as an electric power plant in space. Main theme of our research work is that SPS will collect solar energy, converts sunlight to electricity and beam the power to ground-based receiving stations. The attenuation that results from passing through the atmosphere, sunlight in Earth orbit is about 25% more intense than on the ground. Four main parts of microwave power transmission (MPT) for Solar power satellite system are- highly efficient solar cell for space solar panel, a microwave generator (for high power application magnetron can be used and for low power application we can use solid state amplifier), an antenna to transmit microwave power, and a rectenna to receive and convert the microwave energy into usable DC power. With the increases in energy cost and recent interest in finding ways to produce energy with reduced emission of greenhouse gasses, SPS can play a vital role. The ultimate concentration of this research work is to introduce Solar Power Satellite system with multi-junction solar cell which enhances overall efficiency of space solar panel and modern technologies associated with MPT for proposed SPS system.