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6th Symposium on Usable Privacy and Security, SOUPS 2010

作者： Motiee, Sara Hawkey, Kirstie Beznosov, Konstantin Laboratory for Education and Research in Secure Systems Engineering Department of Electrical and Computer Engineering University of British Columbia Vancouver Canada

ISBN: (纸本)9781450302647

The principle of least privilege requires that users and their programs be granted the most restrictive set of privileges possible to perform required tasks in order to limit the damages caused by security incidents. Low-privileged user accounts (LUA) and user account control (UAC) in Windows Vista and Windows 7 are two practical implementations of this principle. To be successful, however, users must apply due diligence, use appropriate accounts, and respond correctly to UAC prompts. With a user study and contextual interviews, we investigated the motives, understanding, behaviour, and challenges users face when working with user accounts and the UAC. Our results show that 69% of participants did not apply the UAC approach correctly. All 45 participants used an administrator user account, and 91% were not aware of the benefits of low-privilege user accounts or the risks of high-privilege ones. Their knowledge and experience were limited to the restricted rights of low-privilege accounts. Based on our findings, we offer recommendations to improve the UAC and LUA approaches. © 2010 ACM.

关键词： usable security least privilege user account least privilege principle user account control

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Region-based modeling and tree edit distance as a basis for gesture recognition

Region-based modeling and tree edit distance as a basis for ...

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10th International Conference on Image Analysis and Processing, ICIAP 1999

作者： Bellando, John Kothari, Ravi Artificial Neural Systems Laboratory Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0769500404

Towards developing a gesture-based interface for human computer interaction (HCI), we propose a method which represents the shape of a hand as the union of a set of identically parameterized (disk-shaped) regions. Connectivity between the disk shaped regions is then imposed to allow for the accurate modeling of the hand. Signatures for gestures are then generated based on minimizing the edit distance between the model (consisting of both the disks and a connectivity-preserving tree structure) obtained from image frames acquired at successive time instants. © 1999 IEEE.

关键词： Human computer interaction

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Texture based look-ahead for decision-tree induction 2nd

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2nd International Conference on Advances in Pattern Recognition, ICAPR 2001

作者： Dong, Ming Kothari, Ravi Artificial Neural Systems Laboratory Department of Electrical and Computer Engineering and Computer Science University of Cincinnati CincinnatiOH45221-0030 United States

ISBN: (纸本)3540417672

Decision tree induction corresponds to partitioning the input space through the use of internal nodes. A node attempts to classify the instances misclassified by upper level nodes using a greedy search strategy, i.e. to maximize the number of instances correctly classified at the node. However, in so doing it is possible that the distribution of the remaining (misclassified) instances is complex thereby requiring a large number of additional nodes for classification. The so-called look-ahead method was proposed to examine the classifiability of the remaining instances. Typically, this is done using a classifier parameterized identically (e.g. hyperplane) to the one used for partitioning. The number of correct classification achieved in the look-ahead stage is factored in choosing the partition established at a node. This has led to mixed results. In this paper we argue that 1-step (or a few step) look-ahead amounts to an approximate estimate of the classifiability of the remaining instances. In many cases, it is gross approximation and hence the results are mixed. We present an alternative approach to look-ahead which uses the joint probability of occurrence of the classes as a way of characterizing the classifiability of the remaining instances. We present the algorithm and some experimental results. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Decision trees

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Built-in self-diagnostic by space-time compression of test responses

Built-in self-diagnostic by space-time compression of test r...

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1992 IEEE VLSI Test Symposium, VLSI 1992

作者： Karpovsky, M.G. Chaudhry, S.M. Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University BostonMA02215 United States

ISBN: (纸本)0780306236

Presents two different methodologies for built-in self-diagnostic of boards and systems by space-time compression of test responses. The first method, soft decision, uses nonbinary multiple error-correcting codes to obtain space-time signatures. These obtained signatures and the corresponding precomputed references are compared and magnitudes of distortions in signatures are analyzed to identify faulty components. The second method, hard decision, makes use of the information indicating whether the corresponding signatures are distorted or not. Both approaches show considerable savings in hardware overheads when compared with a straightforward approach where a separate signature is required for every component. A transition from the soft to hard decision approach results in an increase in the number of signatures required for diagnostic but at the same time it results in a decrease in the complexity of a fault locating algorithm. Results pertaining to VLSI implementations are presented where the hardware overhead is estimated in terms of two-input equivalent gates. © 1992 IEEE.

关键词： Data compression

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Effect of pruning small weights in correlation associative memories

Effect of pruning small weights in correlation associative m...

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1997 IEEE International Conference on Neural Networks, ICNN 1997

作者： Kothari, R. Lotlikar, R. Artificial Neural Systems Laboratory Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780341228

In this paper we examine the effect of pruning small weights in correlation associative memories. The effect is investigated by considering a fully interconnected matrix and removing weights satisfying |w|Ε. We show analytically that under suitable constraints on Ε, the capacity of a sparsely connected associative memory is comparable to that of a fully connected one, without compromising the basins of attraction around the prototype fixed points. Simulation results supporting the analysis are also presented. © 1997 IEEE.

关键词： Associative processing

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Elastic shape registration using an incremental free form deformation approach with the ICP algorithm

Elastic shape registration using an incremental free form de...

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Canadian Conference on computer and Robot Vision

作者： Abdelmunim, Hossam Farag, Aly A. Computer and Systems Engineering Department Faculty of Engineering Ain Shams University Cairo 11517 Egypt Computer Vision and Image Processing Laboratory Electrical and Computer Engineering Department University of Louisville KY 40292 United States

ISBN: (纸本)9780769543628

Shape registration is one of the most challenging problems in computer vision and medical imaging. The process is affected by the way the shape is represented and the form of transformation used to move the source shape. Our paper handles the elastic shape registration by combining the incremental free form deformation (IFFD) with the point-based registration technique using the sum of least squares method. The iterative closest point (ICP) algorithm is used as a criteria to establish point correspondences in each level of the IFFD framework. The free form deformation (FFD) is well known in the literature and works by forming a lattice of control points that can move and hence deform the domain grid points smoothly and uniformly under some shape constrains. The control lattice resolution is increased step by step to achieve a satisfactory deformation of the source shape to exactly match the target boundaries. Our point-based registration is based on least squares that measure the Euclidean distance between source and target boundaries in addition to the shape constrains. The minimization gives a closed form solution of the lattice control points positions. Promising results will be demonstrated for closed and open shapes and structures. The approach can also work for structures that contain multiple parts without any problems. © 2011 IEEE.

关键词： Medical imaging

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Switching between MPPT and VSG Controls for Utility-Scale Photovoltaic Plants to Mitigate Power System Oscillations

Switching between MPPT and VSG Controls for Utility-Scale Ph...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Ratnakumar, Rajan Venayagamoorthy, Ganesh K. Clemson University Real-Time Power and Intelligent Systems Laboratory Holcombe Department of Electrical and Computer Engineering Clemson United States University of Pretoria Department of Electrical Electronic and Computer Engineering South Africa

ISBN: (纸本)9798350376067

The decline of conventional synchronous generators in the modern power system is driven by the increasing demand for low-inertia/inertia-less renewable energy sources (RES), consequently leading to the growing integration of inverter-based resources (IBRs) into the power system. The incorporation of low-inertia/inertia-less IBRs makes the monitoring and damping of low-frequency electromechanical oscillations (EMOs) crucial. While Virtual Synchronous Generator (VSG) control introduces virtual inertia into the power system, it does not maximize energy capture from RES as effectively as maximum power point tracking (MPPT) does, as it should maintain a power reserve to provide the inertial support and damping. In this study, switching IBRs between MPPT and VSG controls based on an EMO index (EMOI) threshold is proposed to mitigate the emergence of EMO. The impact of the switching control of IBRs is illustrated for a modified two-area, four-machine power system with two large solar photovoltaic plants. Typical results are presented from a simulation on real-time digital simulator (RTDS) to show improved EMOI. © 2024 IEEE.

关键词： Synchronous generators

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A Methodology for Estimating Allocation of Electric Vehicle Grid Interfaces in a Distribution System

A Methodology for Estimating Allocation of Electric Vehicle ...

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2024 IEEE PES/IAS PowerAfrica, PowerAfrica 2024

作者： Subasinghe, Imanthi Kalanika Venayagamoorthy, Ganesh K. Real-Time Power and Intelligent Systems Laboratory Holcombe Department of Electrical and Computer Engineering Clemson University Clemson United States Electronic and Computer Engineering University of Pretoria Department of Electrical South Africa

ISBN: (纸本)9798350389388

The integration of electric vehicles (EVs) into the smart grid has introduced new challenges and opportunities for optimizing power and energy management. This paper presents a simple method using a decision-tree to estimate allocation of electric vehicle grid interfaces (EVGIs) for EV charging/discharging, leveraging the nodal capabilities of a distribution system. The future distribution system will cater for vehicle-to-grid (V2G) transactions in addition to grid-to-vehicle (G2V) transactions, thus EVGIs allowing for bidirectional (G2V/V2G) power flows need to be deployed. The proposed decision-tree method is based on nodal power flow ratings and peak demand at the nodes assuming the nodal voltages are maintained within their stability envelopes by volt-var optimization and other voltage control methods. The allocation of EVGIs in the IEEE 34 test node feeder distribution system using the decision-tree method is illustrated. The EVGI allocation using decision-trees is a simple method that can provide insights of a typical distribution system's capability to support EV integration with emerging smart grid technologies. © 2024 IEEE.

关键词： DC distribution systems

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AutoMate: Enabling autonomic applications on the grid 5

AutoMate: Enabling autonomic applications on the grid

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5th Annual International Workshop on Active Middleware Services, AMS 2003

作者： Agarwal, M. Bhat, V. Liu, H. Matossian, V. Putty, V. Schmidt, C. Zhang, G. Zhen, L. Parashar, M. Khargharia, B. Hariri, S. Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers the State University of New Jersey United States High Performance Distributed Computing Laboratory Department of Electrical and Computer Engineering University of Arizona United States

ISBN: (纸本)0769519830

The increasing complexity, heterogeneity and dynamism of networks, systems, services applications have made our computational/information infrastructure brittle, unmanageable and insecure. This has necessitated the investigation of a new paradigm for design, development and deployment based on strategies used by biological systems to deal with complexity, heterogeneity, and uncertainty, i.e. autonomic computing. This paper introduces the AutoMate project and describes its key components. The overall objective of AutoMate is to investigate key technologies to enable the development of autonomic grid applications that are context aware and are capable of self-configuring, self-composing, self-optimizing and self-adapting. Specifically, it will investigate the definition of autonomic components, the development of autonomic applications as dynamic composition of autonomic components, and the design of key enhancements to existing grid middleware and runtime services to support these applications. © 2003 IEEE.

关键词： Middleware

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An adaptive cross-layer mapping algorithm for MPEG-4 video transmission over IEEE 802.11e WLAN

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Telecommunication systems 2009年第3-4期42卷 223-234页

作者： Lin, C.-H. Shieh, C.-K. Ke, C.-H. Chilamkurti, N.K. Zeadally, S. Department of Electrical Engineering National Cheng Kung University Tainan 701 Taiwan Department of Computer Science and Information Engineering National Kinmen Institute of Technology Kinmen Taiwan Department of Computer Science La Trobe University VIC Australia Network Systems Laboratory Department of Computer Science and Information Technology University of the District of Columbia Washington DC United States

This paper proposes an adaptive cross-layer mapping algorithm to improve the transmission quality of MPEG-4 video stream over an IEEE 802.11e wireless network. Instead of classifying video data to a specific access category in an 802.11e network, we propose an algorithm that dynamically maps MPEG-4 video packets to appropriate access categories according to both the significance of the video data and the network traffic load. Our proposed cross-layer architecture passes information about the significance of video packets from the application layer to the media access control layer. The queue length of a specific access category is used to deduce the network traffic load. We conducted a performance evaluation of our proposed cross-layer approach under both light and heavily loaded network conditions. Our simulation results demonstrate: (a) superior performance of our proposed approach (under both light and heavy loads) over 802.11e (Enhanced Distributed Channel Access (EDCA) and static mapping schemes, (b) not only guarantees prioritized transmission of essential video data but also provides efficient queue length utilization. © 2009 Springer Science+Business Media, LLC.

关键词： Motion Picture Experts Group standards

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