Indexing

Abstract: Haptics is the science of applying touch sensation and control for interaction with virtual or physical application. In this project, our aim is to make a robotic arm that will copy the actual movements of a human hand. Motion of the hand will vary the potentiometer resistance which is placed on the human arm. This change in resistance produces an equivalent output voltage which is given to the microcontroller. The microcontroller converts this analog signal to digital and produces corresponding PWM signals which are required for the servomotors on the robotic arm to run. Servomotors are connected to the receiver microcontroller. PWM pulses are sent to the receiver controller. The hardware of this project is very user friendly, portable, easy to handle and also very light in weight. It has a very simple design and also very easy to assemble. We have used 5 Degrees of Freedom i.e. Shoulder, Elbow, Wrist and Finger

Abstract: RFID based museum guide (Electronic hand held device) is designed to replace tourist guides to an extent. It’s a voice powered device that speaks out as the tourist is travelling from one monument to another monument (museum).This is achieved by placing a RFID receiver with the tourist (palm device). As soon as the electronic hand held device comes in the local area id the microcontroller receives the RF tag unique id from the receiver and compete it with its own data. If there is similarity occurs the microcontroller will play an audio clip related to that statue/painting.  An RFID module basically comprises a tag and a reader. A  RFID system comprises of an antenna, a transceiver and a transponder.

Abstract: The power conversion from AC to DC and vice versa is basic need for several industrial applications, single phase or three phase controlled or uncontrolled convertor is used for this purpose. In these types of convertors large lower order harmonics are present. A twelve pulse three phase rectifier is used for reducing harmonics in high power applications, but the (12m±1) order harmonics are still present in the system. For further reduction of harmonics this paper proposes a PI controller based synchronous twelve pulse generator used for gate triggering of controlled twelve pulse rectifier with DC motor as a load.

Abstract: Information is an important commodity in the world of Electronic communication. To achieve a secure communication between communicating parties, the protection of authenticity and integrity of information is necessary. Cryptographic hash functions play a central role in cryptology. A cryptographic hash function takes an input of arbitrary large size and returns a small fixed size hash value. It satisfies three major cryptographic properties: preimage resistance, second preimage resistance and collision resistance. Due to its cryptographic properties hash function has become an important cryptographic tool which is used to protect information authenticity and integrity. This thesis presents a review of cryptographic hash functions. The thesis includes various applications of hash functions. It gives special emphasis on dedicated hash functions MD5.
Recent breakthroughs in cryptanalysis of standard hash functions like SHA-1 and MD5 raise the need for alternatives. In the past few years, there have been significant research advances in the analysis of hash functions and it was shown that none of the hash algorithm is secure enough for critical purposes whether it is MD5 or SHA-1. Nowadays scientists have found weaknesses in a number of hash functions, including MD5, SHA and RIPEMD. So the purpose of this thesis is combination of some function to reinforce these functions and also increasing hash code of message digest of length up to 160 that makes stronger algorithm against collision and brute force attacks.

Abstract: A low-cost high-performance fuel cell inverter for nominal 48 V dc to 120 V ac conversion is described. The inverter topology eliminates the need for a dc intermediate voltage by using an ac-link output inverter. The design minimizes overall system cost – including energy storage and management. The design provides low-ripple current-controlled interfacing to the fuel-cell stack, an intermediate-voltage battery energy storage buffer, and an ac-link output inverter. The circuit is based on square-wave cycloconverter technology, combined with a simple approach modulation process. Number of stages and magnetic elements low while providing galvanic isolation. Either SCRs or IGBTs can be used as output devices, which provides an unusual cost/performance trade-off possibility. Gate drives and other control elements are also simplified. The design provides excellent performance with a minimum of filter components and a simple control.

Abstract:The proposed project helpful for handicap person who does not have ability to write due to absence of arm. The lack of writing arm may limit the quality of creative expressions. But same person can speak and that vocal words sense by the microphone processed by the ARM2148 processor which actuate the robotic arm assembly. The robotic arm arrangement with the pen made such that it moves on axial co-ordinates and capable of writing words on the paper. The fastest processing speed of ARM2148 has utilized to achieve high speed of writing operation .This paper describes how the proposed project performs the functions of writing and its results. This project is the ray of hope for physically challenged person.

Abstract: The software development for the Wireless Sensor Networks is complicated. Mainly by the programming languages and tools existing for it, which are unconventional to the well-known for the PC system developments. However, the use of middleware helps to this activity, increasing the abstraction level existing in the platform and making possible only think about the software requirements to the programmer. The present work describes the implementation of a multi-thread middleware which adopts the Java programming language and its standard class library for the threads programming. Helped by a Java RT kernel which complies with the Java Real-Time Specification Group. Also is reported the optimization for a better performance in the Java byte code interpretation.

Abstract:  Wind energy is becoming the most effective renewable energy source mainly because of the growing concerns over carbon emissions and uncertainties in fossil fuel supplies and the government policy impetus. The increasing penetration of wind power in distribution systems may significantly affect VAR compensation and max. Power tracking of the systems, particularly during wind turbine cut-in and cut-off disturbances.                                   
A DFIG based wind turbine has an ability to generate maximum power with varying and adjustable speed, ability to control active and reactive power by the integration of electronic power converters, low power rating of cost converter components, and so on. This study presents an overview and literature survey over past few decades on the different problems associated due to penetration of WT-DFIG in the power system and control aspects of DFIG.