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High-input Impedance Voltage-mode Universal Filter Using CCCCTAs

High-input Impedance Voltage-mode Universal Filter Using CCC...

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Electronics, computer, Telecommunications and Information technology International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information technology

作者： Winai Jaikla Abhirup Lahiri Adisorn Kwawsibsame Montree Siripruchyanun Electric and Electronic Program Faculty of Industrial Technology Suan Sunandha Rajabhat University Dusit Bangkok THAILAND Part of the work done while the author was with Division of Electronics and Communications Netaji Subhas Institute of Tec hnology Electronics Department Lanna Polytechnical College Chiangmai Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut's University of Technology North Bangkok

ISBN: (纸本)9781424456062

This article presents a voltage-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on current controlled current conveyor transconductance amplifiers (CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely 3 CCCCTAs and 2 grounded capacitors. Without any external resistors, requiring no component matching conditions, and using only grounded elements, the proposed circuit is very appropriate to further develop into an integrated circuit. Moreover, the proposed circuit enables easy cascading in voltage-mode, due to high-input impedances. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The power consumption is approximately 4.08mW at ±2.5V power supply voltages.

关键词： Impedance Band pass filters Tuned circuits Low pass filters Voltage control Transconductance Q factor Frequency Capacitors Resistors

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Mitigating the degenerations in microsoft word documents: An improved steganographic method

Mitigating the degenerations in microsoft word documents: An...

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2009 2nd International Conference on computer, Control and Communication, IC4 2009

作者： Gupta, Anand Barr, Deepak Kumar Sharma, Deepali Department of Computer Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India Department of Biotechnology Netaji Subhas Institute of Technology Dwarka New Delhi India

ISBN: (纸本)9781424433148

Steganography is the science of writing hidden messages in such a way that no one apart from the sender and intended recipient even realizes if there is any hidden message. Most of the research done before in this area is focussed on images, audios, and videos but a less amount of work has been done on MS Word documents which is identified with certain shortcomings. One of the major shortcoming in the previous method being large number of degenerations which were produced to embed a message, making it susceptible to active warden attack. This paper proposes to mitigate the shortcoming of the previous approach by decreasing the number of degenerations for the same. Experimental results will show the feasibility of our approach. © 2009 IEEE.

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Privacy violation in limited disclosure of database having functional dependency

Privacy violation in limited disclosure of database having f...

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2009 2nd International Conference on computer, Control and Communication, IC4 2009

作者： Gupta, Anand Mondal, Arnab Singal, Ashish Mittal, Atul Department of Computer Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India

ISBN: (纸本)9781424433148

Upholding the privacy of data has gathered increased interest in the current industrial scenario. The databases that hold personal information and the individuals' choices of privacy are often subjected to attacks from mischievous sources which try to access undisclosed data. The means used to achieve such ends may be in the form of complex queries that combine sensitive data with the non-sensitive ones. Access Control mechanisms are already in place to prevent such malicious accesses. But the problem is highly compounded when there is a functional dependency among some of the attributes of the data. In such cases often the disclosed data of one person allows the user to infer the undisclosed data of another person. In this paper we propose a model to prevent the breach of privacy through such inference channels of functional dependency. Then we describe the architecture of our model and the corresponding implementation. Finally we carry out a performance analysis to evaluate the cost overheads of time and space and look out topics for future research. ©2009 IEEE.

关键词： Sensitive data

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Complex diffusion based speckle reduction from digital images

Complex diffusion based speckle reduction from digital image...

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International Conference on Methods and Models in computer Science, ICM2CS09

作者： Srivastava, Rajeev Gupta, J.R.P. Parthasarthy, Harish Department of Computer Engineering Institute of Technology BHU Varanasi-221005 India Netaji Subhas Institute of Technology Dwarka New Delhi-110078 India

ISBN: (纸本)9789380043579

A complex diffusion process based on Schriidinger wave equation is proposed and implemented as a nonlinear filter to perform homomorphic filtering for reducing speckle noise from digital images. Due to the multiplicative and complex nature of speckle noise it becomes practically difficult to restore a degraded image, hence a homomorphic filtering approach is used for the reduction of the same. The homomorphic filtering refers to applying logarithm transformation on input image to convert the multiplicative noise to additive one, applying complex diffusion based inverse filter and finally taking the exponential of filter output to produce the restored image. For digital implementations, the proposed PDE is discretized using finite difference scheme. For software implementation MATLAB 7.0 was used and performance of the proposed scheme was evaluated for different speckle noise variance of the gray test images both qualitatively and quantitatively and the results obtained justify the applicability of proposed scheme.

关键词： MATLAB

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A New Method for Reverse Prediction of MPEG frames in Video Streaming

A New Method for Reverse Prediction of MPEG frames in Video ...

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IEEE International Advance Computing Conference, IACC

作者： Sandeep Kumar Satish Chand Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi India

Recently macroblock based technique for backward playback of MPEG video streaming has been discussed in which the network bandwidth and buffer size requirements are less. In this technique, the macroblocks are divided into two categories backward macroblock (BMB) and forward/backward macroblock (FBMB) based upon their motion characteristics. In this paper, we propose a new method in which the network bandwidth requirement further reduces without incurring cost on the buffer. We predict the required I or P-frame from the currently decoded frame which resides in the frame buffer at the client system. The motion vector information of the current frame is used to find the position of its various pixels in the previous frame and the prediction errors of the current frame are used to find their exact values. We performed extensive simulations on various videos having slow, medium and high motion characteristics. Experimental results show that on an average 93.4% of pixels in previous I- or P-frame can be reverse-predicted from the current P-frame. This makes considerable saving in the network bandwidth requirement as fewer pixels are requested from the server.

关键词： Streaming media Video compression Bandwidth Video recording computer networks Decoding ISO standards YouTube Displays Costs

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An efficient power-aware broadcast technique for wireless ad hoc networks

An efficient power-aware broadcast technique for wireless ad...

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2009 Spring Simulation Multiconference, SpringSim 2009

作者： Dhurandher, Sanjay K. Misra, Sudip Obaidat, Mohammad S. Lochab, Priyedev Sharma, Varun Kumar Gautam, Siddharth Division of Information Technology Netaji Subhas Institute of Technology University of Delhi New Delhi India School of Information Technology Indian Institute of Technology KharagpurWest Bengal India Department of Computer Science Monmouth University NJ United States

In this paper we focus on the problem of constructing an optimal broadcast tree rooted at a given source node that maximizes the network lifetime from the view point of number of messages broadcasted during the network lifetime. We define the network lifetime as the lifetime of the node in the network which exhausts its energy at the earliest. We propose improvements over the broadcast incremental power (BIP) protocol in two phases (algorithms). The first algorithm assumes that the network is heterogeneous with different devices having different initial battery energy level and the second one assumes the network to be composed of devices with equal initial energies. These algorithms build upon the broadcast nature of the wireless communication environment - a message broadcasted from a given node reaches all the nodes that are within the sphere defined by the transmitting range of the node as radius. We have also provided the simulation results to testify our claims. The results further prove the superior performance of the proposed improved BIP algorithm.

关键词： Energy efficiency

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ADT: Age determination technique

ADT: Age determination technique

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Proceeding of International Conference on Methods and Models in computer Science (ICM2CS)

作者： Anand Gupta K. Ravi Manish Gupta Kartik Gupta Department of Computer Science Engineering Netaji Subhas Institute of Technology New Delhi India Instrumentation & Control Engineering Netaji Subhas Institute of Technology New Delhi India

Biometrics has carved an important place in the field of identification and authentication. Identification in biometrics includes various applications like face recognition. There are scads of work done in the area of face recognition but we feel that there is not much of work has been done in the field of age determination. The age determination technique is useful to determine the age of an unknown body found in criminal activities or in lost and found cases using offline face recognition. The aging process not only depends on the person's biological aspect such as genes but may also depend on physical aspect such as wrinkles on the person's face. In this paper a novel technique is proposed to determine the age of a person by analysing the wrinkles present on his/her face. A framework has been designed which is based on the principle that the age of a person varies proportionally with the depth of wrinkles. The experimental result obtained found out to have 20% error which is within practical limits.

关键词： Biometrics Face recognition Support vector machines Image databases computer science Authentication Application software Aging Humans Eyes

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Mitigating the degenerations in Microsoft Word documents : An improved steganographic method

Mitigating the degenerations in Microsoft Word documents : A...

引用

International Conference on computer, Control and Communication

作者： Anand Gupta Deepak Kumar Barr Deepali Sharma Department of Computer Engineering Netaji Subhas Institute of Technology New Delhi India

ISBN: (纸本)9781424433131

关键词： Steganography Writing Videos Humans HTML Biotechnology Art Ink Digital signatures Spread spectrum communication

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Meliorated Approach for Efficient Computation of Shortest Path on Edge Based Data Structure

Meliorated Approach for Efficient Computation of Shortest Pa...

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IEEE International Advance Computing Conference, IACC

作者： Anand Gupta Ankur Maheshwari Gaurav Jain Department of Computer Engineering Netaji Subhas Institute of Technology New Delhi India

The novel representation of the graph using edge based data structure, as proposed in [1] is an adapted version of half edge structure, traditionally used in digital geometry processing [6]. This edge based data structure provides an efficient way for storing and accessing graphs. However the shortest path algorithm implemented in [1] on the above mentioned data structure proves to be inefficient when dealing with extensive graphs with varying scales and degrees. The main concern is to minimize the time and space overheads involved, as they take a great toll on system resources. The short comings associated with the above mentioned approach acted as our motivation. In this paper, we present an approach based on greedy and intuitionist programming strategies, which derives advantages from heuristics that apply to all kinds of graph, hence achieving greater efficiency. This aspect of the algorithm is also borne out by the experimental conclusions we have obtained.

关键词： Data structures Shortest path problem Data engineering Computational geometry Information systems Graph theory Telecommunication computing Solid modeling Network topology Global Positioning System

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Privacy violation in limited disclosure of database having functional dependency

Privacy violation in limited disclosure of database having f...

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International Conference on computer, Control and Communication

作者： Anand Gupta Arnab Mondal Ashish Singal Atul Mittal Department of Computer Engineering Netaji Subhas Institute of Technology New Delhi India

ISBN: (纸本)9781424433131

Upholding the privacy of data has gathered increased interest in the current industrial scenario. The databases that hold personal information and the individuals' choices of privacy are often subjected to attacks from mischievous sources which try to access undisclosed data. The means used to achieve such ends may be in the form of complex queries that combine sensitive data with the non-sensitive ones. Access control mechanisms are already in place to prevent such malicious accesses. But the problem is highly compounded when there is a functional dependency among some of the attributes of the data. In such cases often the disclosed data of one person allows the user to infer the undisclosed data of another person. In this paper we propose a model to prevent the breach of privacy through such inference channels of functional dependency. Then we describe the architecture of our model and the corresponding implementation. Finally we carry out a performance analysis to evaluate the cost overheads of time and space and look out topics for future research.

关键词： Data privacy Databases Diseases Access control Hospitals Medical treatment Data engineering computer industry Performance analysis Costs

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