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A Parallel Algorithm for Computing Minimum Spanning Trees

A Parallel Algorithm for Computing Minimum Spanning Trees
Abstract: We present a simple and implementable algorithm that computes a minimum spanning tree of an undirected weighted graph vertices and edges on an EREW PRAM using n m processors. This represents a substantial improvement in the running time over the previous results for this problem using at the same time the weakest of the PRAM models. It also implies the existence of algorithms having the same complexity bounds for the EREW PRAM for connectivity ear decomposition
biconnectivity strong orientationnumbering and Euler tours problems.

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Fog Computing Mitigating Insider Data Theft Attacks in the Cloud ppt full

Fog Computing Mitigating Insider Data Theft Attacks in the Cloud

Abstract:Cloud computing promises to significantly change the way we use computers and access and store our personal and business information. With these new computing and communications paradigms arise new data security challenges. Existing data protection mechanisms such as encryption have failed in preventing data theft attacks, especially those perpetrated by an insider to the cloud provider.

We propose a different approach for securing data in the cloud using offensive decoy technology. We monitor data access in the cloud and detect abnormal data access patterns. When unauthorized access is suspected and then verified using challenge questions, we launch a disinformation attack by returning large amounts of decoy information to the attacker. This protects against the misuse of the user’s real data. Experiments conducted in a local file setting provide evidence that this approach may provide unprecedented levels of user data security in a Cloud environment.

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Motion Estimation Algorithms in H.264 Video Codec full Paper

Motion Estimation Algorithms in H.264 Video Codec full Paper presentation
Abstract:  Motion estimation is most time consuming part of the H.264 encoder. Block-matching motion estimation is vital to many motion compensated video coding techniques, which is aimed to exploit the strong temporal redundancy between successive frames. However, the motion estimation is quite computational intensive and can consume up to 80% of the computational power of the encoder if the full search is used by exhaustively evaluating all possible candidate blocks within a search window. Therefore, fast search algorithms are highly desired to significantly speed up the process without sacrificing the distortion seriously.  The major motivation behind this project is to improve the existing H.264 codec by reducing the complexity in the parameters like speed and bandwidth. The block matching algorithms have most of the impact on the encoder performance, and hence the key idea here is that if  the proposed algorithm improves bandwidth or speed then we can easily integrate that into well known H.264 codec, which is used by huge number of the applications.

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Ultracapacitors Paper presentation full

 Ultracapacitors Seminar Paper presentation full download doc
Abstract: Ultracapacitors are unique energy storage devices that exhibit very high power densities and exceptionally long life. Maxwell Technologies ultracapacitors are used in over 20,000 wind turbines globally.
This presentation will provide an overview of ultracapacitor technology, and show how ultracapacitors can be used for back-up power in electromechanical pitch control systems. Ultracapacitors will be compared and contrasted to batteries as the back-up power source. Finally, the financial aspects for business case development comparing ultracapacitors and batteries will be examined and compared.

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A SOFTWARE HARDWARE COOPERATIVE IMPLEMENTATION OF BIRD’S-EYE VIEW FOR CAMERA-ON-VEHICLE

Abstract: Rear camera or other wide-angle camera mounted on vehicle has serious perspective effect which makes driver unable to feel distance correctly and is  not helpful for succeeding image analysis. To remove perspective effect, it’s necessary to change diagonal view to bird’s-eye view. In this paper, a software-hardware cooperative bird’s-eye view system is proposed, which can estimates the transformation matrix and changes the view automatically in real-time. The matrix estimation module is implemented by software, because it only needs to calculate once. The transformation part is implemented by hardware, because it must be done repetitively and it requires high computation power. To optimize hardware performance and save cost, three optimization approaches like one-step transformation, memory pre-estimation and look-up table (LUT) have been employed.

Keywords: camera-on-vehicle; bird’s-eye view; vehicle safety; inverse perspective mapping

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Matrix Converter-Based Unified Power-Flow Controllers: Advanced Direct Power Control Method

Abstract—This paper presents a direct power control (DPC) for three-phase matrix converters operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical principles of direct power control (DPC) based on sliding mode control techniques are established for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power, together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix converter switching state guaranteeing good steady-state and dynamic responses. Experimental results of DPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power linear controllers based on a modified Venturini high-frequency PWM modulator, the experimental results of the advanced DPC-MC guarantee faster responses without overshoot and no steady-state error, presenting no cross-coupling in dynamic and steady-state responses.

Index Terms—Direct power control (DPC), matrix converter (MC), unified power-flow controller (UPFC).

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DC/DC Boost Converter Functionality in a Three-Phase Indirect Matrix Converter

Abstract—An indirect matrix converter (IMC) connected with two input power sources is proposed: a gasoline generator as the main ac power supply and batteries as the secondary power source.
The IMC is small in size because of having a dc-link part without an electrolytic capacitor. The dc-link part is utilized by connection with a boost-up chopper with batteries as a secondary input power source. Furthermore, the chopper connects to the neutral point of the motor and utilizes the leakage inductance of the motor as a reactor component. The proposed technique successfully further
reduce the size of the converter by removing the boost reactor in the boost converter stage. The proposed converter is simulated and experimentally validated using a 750-W prototype and an induction motor driven with V/f control. The total harmonic distortion of the input and output currents are 4% and 3.7%, respectively, and the efficiency is 96%.

Index Terms—Boost-up chopper, leakage inductance, neutral point of a motor, three-phase ac/ac converter, zero-vector switching.

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