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1. PaperID 028: Congestion control in wireless sensor networks using learning automata  (pp:157-165)    | Fulltext|

Parisa Moghiseh, Amin Heydari


Abstract
— Wireless sensor networks built of a set of sensor nodes are used in a variety of areas today. These networks are in charge of sensing, aggregating and combining data and finally sending them to the central station. Regarding the particular limitations of wireless sensor nodes, like the ability of transporting a small and limited battery, and considering the fact that these limitations might have a huge affection on the efficiency of this type of networks, having a low power consuming function counts as one of the essential requirements of these networks. Congestion may happen along the path. Not only it causes severe loss of data, but it causes excessive energy consumption in nodes. Up until now, many multi-routing protocols have been presented for transferring data in multipath, however, congestion control mechanisms for multi-routings are hardly found. Despite the several limitations of wireless sensor networks, like limited memory and bandwidth and also disability in complex calculations, these networks are used in lots of applications. Our study focuses on the problem of partial coverage. In this paper we present novel algorithm that relies on Learning Automata to implement sleep scheduling approaches. It aims at minimizing the number of sensors to activate for covering a desired portion of the region of interest preserving the connectivity among sensors. Simulation results show how the proposed algorithm can select sensors in an efficient way to satisfy the imposed constraints, thus guaranteeing good performance in terms of time complexity, working-node ratio, scalability, and WSN lifetime

Keywords- Congestion control, Network Lifetime, Consumed Energy, Packet Drop Rate, Wireless Sensor Networks.

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2. PaperID 029: Design of a new full_ Adder using silicon transistors (pp:166-168)    | Fulltext|

Mohammad Reza Mahjour


Abstract
— The collectors are one of the most important elements in digital circuits. Providing an optimal design of this element will significantly help improve the output parameters of these circuits a new design of all collectors is presented using transient gate transistor The simulation results obtained using the HSPICE software at a voltage of 1.8 volts are presented below. Simulation results show a significant improvement in power parameters, latency and previous designs

Keywords- Congestion Full adder, Silicon transistors, gate transistors.

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3. PaperID 030: A survey: Electronic sensors in electronic digital (pp:169-174)    | Fulltext|

Mohammad Mohsen Afsharifar


Abstract
— an organic temperature detector is presented that consists of an organic temperature sensor and an organic complementary read-out circuit. The temperature sensor is a Wheatstone bridge composed of temperature-sensitive polymer films and metal films. The read-out circuit receives an analog temperature signal from the temperature sensor and outputs a 1-bit digital signal that reflects whether the temperature has exceeded a threshold temperature or not. For more detailed read-out, detection of the temperature range the temperature sensor is within also demonstrated using an organic 2-bit analog-to- digital converter as a read-out circuit. This paper reports a new digital readout electronics for capacitive sensors like accelerometer, gyroscopes or inclinometers. The functional principle of the readout electronics is shown by the example of the micro-machined gyroscope decoupled angular velocity detector (DAVED) developed at HSG-IMIT [Sens. Actuators A- 84 (2000) 280]. The goal of this digital concept is to minimize noise and temperature drifts caused by the analog components of the readout electronics. This is feasible, because the main part is done digitally inside a digital signal processor (DSP). Further, this new digital concept is not only used for temperature compensation or force-to-rebalance loops [Algorithm and low power digital implementation for MEMS inertial sensors, Final report 1999-2000 for MICRO Project 99-083] it is also used to readout the small capacitive changes of the sensor output.

Keywords- Temperature sensor, organic semiconductor, Analog-to-digital converter, Readout electronics for capacitive sensors; Micro-machined gyroscope; Digital readout.

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4. PaperID 031: nvestigating Carbon Nanotube Field-effect Transistors to Use in Adder Circuits (pp:175-181)    | Fulltext|

Fatemeh Masoumi, Maryam Safarzadeh 


Abstract
—In recent decades, the attempt to perform more computational and processing operations on a silicon chip using adders has created a strong desire to reduce the circuit components scale, especially transistors. Speed and power consumption constraints also push designers to utilize smaller dimensions. There were some problems to reach transistors with smaller dimensions. One of the reasons was due to the employing of silicon dioxide SiO2 as insulation. The over-thinning of this material in the transistors dimension reduction process caused a great loss of energy, current leakage, and chip over-heating during operations. Ultimately, the goal of reducing dimensions is to build a transistor that is smaller, faster, cheaper, and less power consuming. After many experiments, researchers concluded that carbon nanotubes, which are based on carbon structures, could replace the old silicon structure. They concluded that transforming graphene into graphene nano-bars, and limiting electron in a particular direction may create an energy gap in the graphene. The previous research outcomes show that using carbon nanotubes results in delay and power consumption reduction, which in turn decrease the delay and power product. The results of research across all adders with carbon nanotube design show a significant improvement in power and delay parameters compared to previous designs with MOSFET. For this purpose, in this paper, we presented a general overview of transistors which play an important role in reducing the dimensions and delay and power product improvement with proper performance and low power consumption for adders.

Keywords- carbon nanotube field-effect transistors, adders, CNTEFET.

Full Text: PDF [Academia.edu |