2017
Vol 2, No 3 (2017): Power-Efficient Add-Compare-Select Unit Implementation Based On Gate Diffusion Input (GDI) Logic
Authors:Â Rehana Farheen, Dr. Kaleem Fatima
Abstract: This paper presents an area efficient, low-power androbust Add Compare Select(ACS)unit for Viterbi Decoder using GDI (Gate Diffusion Input) logic. Viterbi decoder is used for decoding data encoded using Convolution Forward Error Correction codes or data that suffers from inter-symbol interference. They occur in a large proportion of digital transmission. Viterbi decoders employed in digital wireless communications are complex and dissipate large power. In present scenario the minimization of power consumption have emerged as a key design constraint over the last few years. The proposed method focuses on GDI, which is a low power technique of digital circuit design. Dynamic component of power is reduced in GDI technique as source of PMOS is not permanently connected to Vdd. It also reduces the latency of the circuit. The GDI cell is similar to the standard CMOS inverter, but there are some important differences. The ACS has been implemented using GDI cell with 0.18μm technology. The proposed design is obtained with reduced power dissipation in comparison with CMOS.
Vol 2, No 3 (2017): Enhancement of Pyroelectric Generation from Solar Energy
Authors:Â J. Sunilkumar, V. Saranya
Abstract:Â Pyroelectric thermal energy harvesters are intriguing alternatives to thermoelectric devices due to their high thermodynamic efficiency and reduced heat sink requirements. Thermoelectric generators use see beck effect to generate voltage from a spatial thermal gradient. Instead the temporal changes of the thermal energy can be captured by means of Pyroelectricity. Non-Olsen cycle method of pyroelectricity generation enables the usage of renewable energy sources such as solar energy and wind energy. The aim of this work is to study the ability of harvesting energy using a Lead-zirconate-titanate (PZT-5H) pyroelectric material using Non-Olsen cycle method. The PZT-5H is exposed to solar radiation and a periodic temperature change in the material is obtained by using the mechanical setup. The mechanical setup consists of a rotating chopper disc and a vertical axis wind turbine (savonious type).The savonious wind turbine provides mechanical input to the chopper disc such that it periodically allows the solar irradiation to fall on the PZT-5H material and will provide a time varying temperature. This method proves to be economical than Olsen cycle method as the time varying temperature can be obtained from the naturally available sources such as solar and wind energy. To maximize the output, optical concentrators are used to intensify the solar irradiation.
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Vol 2, No 2 (2017): Survey of Power Optimization Techniques for Network on Chip
Authors:Â Mohammed Waseem Khanooni, S. D. Chede
Abstract:Â Previously, research and design of Network-on-Chip paradigms where mainly focused on improving the performance of the interconnection networks. With emerging wide range of low-power applications and energy constrained highperformance applications, it is highly desirable to have NoCs that are highly energy efficient without incurring performance penalty. In the design of highperformance massive multi-core chips, power and heat have become dominant constraints. Increased power consumption can raise chip temperature, which in turn can decrease chip reliability and performance and increase cooling costs. Dynamic Voltage Scaling is an efficient technique for significant power savings in microprocessors. It has been proposed and deployed in modern microprocessors by exploiting the variance in processor utilization. On a Network-on-Chip paradigm, it is more likely that the wire line links and buffers are not always fully utilized even for different applications. Hence, by exploiting these characteristics of the links and buffers over different traffic, DVFS technique can be incorporated on these switches and wire line links for huge power savings.
Vol 2, No 1 (2017): Effective Technological Method of Producing Bioenergy
Authors:Â A.Mugesh, R.Manivannan, M.Rajasekaran
Abstract:Â This study appraises techno-economic viability for bio-energy production in Dhinnapatti village using different tools for data collection. Since there was no waste management energy generation system in the village, the habitant threw household waste in the streets and used the animal waste as the fertilizer. This waste scan be utilized to generate bio-energy that can be a renewable substitute for natural gas as natural gas is becoming scarce in our country and is suitable for home use in cooking and heating purposes. The biogas-driven engine and generator are off-the-shelf items, and therefore the period of construction of a biogas-based electric power plant is determined by the time needed to construct the biogas reactor. Because a biogas reactor takes on about six months to build, it has been assumed that the entire expenditure is incurred at the commencement of the project. The items involved in the capital expenditure are the biogas reactor, piping, sand filters, engine, generator, accessories and tools, and engine room.
Vol 2, No 1 (2017): Water Level Monitoring Using Internet of Things for Islampur Muncipality
Authors:Â Vaibhav S. Gondkar, Anandrao B. Kakade
Abstract: Water is the most precious and valuable because it’s a basic need of all the human beings but, now days water supply department are facing problem in real time operation. This is because less amount of water is present in resources due to less rain fall. so, to overcome water supply related problems and make system efficient there is need of proper monitoring and controlling system. In this project, we are focusing on continuous and real time monitoring of water supply in IOT platform. Water supply with continuous monitoring makes a proper distribution so that, we can have a record of available amount of water in tanks. Internet of things is nothing but the network of physical objects embedded with electronics, sensors, software, and network connectivity. Monitoring can be done from anywhere as central office. Using ooowebhostapp.com as free sever data continuously pushed on cloud so we can see data in real time operation. Raspberry pi as Minicomputer can monitor data and also control operation from cloud with efficient client server communication.
2016
Vol 1, No 1 (2016): Solar Water Heater
Authors:Pranob J. Lahon, Bashab J. Borah, Rituraj Saikia, Parikhit Charingia, Rituparno Baruah, Biswajit Dutta, Raktim Rajkhowa
Abstract:Â Now-a-days, plenty of hot water is used for domestic, commercial and industrial purposes. Various resources i.e. coal, diesel, gas etc., are used to heat water. Solar energy is the main alternative to replace the conventional energy sources. The solar water heating system is the technology to harness the plenty amount of free available solar energy. The solar system is designed to meet the energy demands. The size of the systems depends on availability of solar radiation, temperature requirement of customer, geographical condition and arrangement of the solar system, etc. Therefore, it is necessary to design the solar water heating system as per above parameters. The available literature is reviewed to understand the construction, arrangement, applications and sizing of the solar thermal system.