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Directed correspondence search: Finding feature correspondences in images using the Harmony Search algorithm

Directed correspondence search: Finding feature corresponden...

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international conference on Image and Vision Computing New Zealand, IVCNZ

作者： Jaco Fourie Richard Green Steven Mills Computer Science and Software Engineering University of Canterbury Christchurch New Zealand Geospatial Research Centre Limited Christchurch New Zealand

A robot's ability to correctly recognise landmarks as ones previously seen is a key feature in visual navigation algorithms. Each newly captured scene contains multiple visual features with an unknown number of new features that have never been observed and old features that need to be correctly recognised and identified. this challenge of correctly identifying common features between different frames is also known as the visual correspondence problem. In this article a new algorithm is presented that attempts to solve this problem by using an adapted version of the Harmony Search algorithm. All features are assumed to be static and consistency in the predicted camera movement is taken into account to remove outliers. Initial results show rapid convergence early in the optimisation process. this suggests that DCS could be effectively used as a rapid way of initialising other algorithms like RANSAC.

关键词： Robot vision systems Cameras Distributed control Layout computer vision Software algorithms Heuristic algorithms computer science Software engineering Milling machines

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Obstacle avoidance on a mobile inverted pendulum robot

Obstacle avoidance on a mobile inverted pendulum robot

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international conference on Image and Vision Computing New Zealand, IVCNZ

作者： Robert Tang Richard Green Mechatronics Engineering University of Canterbury New Zealand Computer Science University of Canterbury New Zealand

Optical flow and monocular vision have been used as a means of providing obstacle avoidance to a telerobotics platform. the robotic platform, controlled to avoid obstacles through an unstructured indoor environment, is of a small two wheeled coaxial robot (inverted pendulum). Suitable digital filtering techniques are developed to remove the effect of the robot's inherent self-stabilizing motion and other effects that corrupt the sensitive optical flow information. the proposed obstacle avoidance method worked well in real-time with some constraints such as slow turning motions and requiring sufficient track-able features in the image.

关键词： Mobile robots Optical filters Robot sensing systems Optical sensors Image motion analysis Telerobotics Robot control Indoor environments Coaxial components Digital filters

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Authorization and Obligation Policies in Dynamic systems

Authorization and Obligation Policies in Dynamic Systems

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24th international conference on Logic Programming (ICLP)

作者： Gelfond, Michael Lobo, Jorge Texas Tech Univ Lubbock TX 79409 USA IBM Corp TJ Watson Res Ctr Yorktown Hts NY USA

ISBN: (纸本)9783540899815

the paper defines a for specifying authorization and obligation policies of an intelligent agent acting in a changing environment and presents several ASP based algorithms for checking compliance of an event with a policy specified in this language. the language allows representation of defeasible policies and is based on theory of action and change.

关键词： Compliance control

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A security punctuation framework for enforcing access control on streaming data

A security punctuation framework for enforcing access contro...

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24th IEEE international conference on Data Engineering/ 1st international Workshop on Secure Semantic Web

作者： Nehme, Rimma V. Rundensteiner, Elke A. Bertino, Elisa Purdue Univ Dept Comp Sci W Lafayette IN 47906 USA Worcester Polytech Inst Dept Comp Sci Worcester MA 01609 USA

ISBN: (纸本)9781424418367

the management of privacy and security in the context of data stream management systems (DSMS) remains largely an unaddressed problem to date. Unlike in traditional DBMSs where access control policies are persistently stored on the server and tend to remain stable, in streaming applications the contexts and with them the access control policies on the real-time data may rapidly change. A person entering a casino may want to immediately block others from knowing his current whereabouts. We thus propose a novel "stream-centric" approach, where security restrictions are not persistently stored on the DSMS server, but rather streamed together with the data. Here, the access control policies are expressed via security constraints (called security punctuations, or short, sps) and are embedded into data streams. the advantages of the sp model include flexibility, dynamicity and speed of enforcement DSMSs can adapt to not only data-related but also security-related selectivities, which helps reduce the waste of resources, when few subjects have access to data. We propose a security-aware query algebra and new equivalence rules together with cost estimations to guide the security-aware query plan optimization. We have implemented the sp framework in a real DSMS. Our experimental results show the validity and the performance advantages of our sp model as compared to alternative access control enforcement solutions for DSMSs.

关键词： Access control

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Semantic Web and firewall alignment

Semantic Web and firewall alignment

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international conference on Data Engineering Workshops

作者： Simon N. Foley William M. Fitzgerald Department of Computer Science University College Cork Ireland Telecommunications Software & Systems Group Waterford Institute of Technology Ireland

Secure Semantic Web applications, particularly those involving access control, are typically focused at the application-domain only, rather than taking a more holistic approach to also include the underlying infrastructure (for example, firewalls). As a result, infrastructure configurations may unintentionally hinder and prohibit the normal operation of the Semantic Web. this paper, discusses an approach involving Description Logic and the Semantic Web Rule Language to provide synergy and alignment between firewall configurations and semantic-aware application configurations.

关键词： Semantic Web Ontologies Access control Logic Communication system traffic control computer science Educational institutions Software systems Application software Security

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systems biology: Models and logics 24th

Systems biology: Models and logics

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24th international conference on Logic Programming, ICLP 2008

作者： Piazza, C. Policriti, A. Dept. of Math. and Computer Science University of Udine Udine Italy Institute of Applied Genomics Udine Italy

ISBN: (纸本)9783540899815

the field of systems biology focuses on creating a finely detailed picture of biological mechanisms. Recently, the need has arisen for more and more sophisticated and mathematically well founded computational tools, capable of analyzing those models that are and will be at the core of systems Biology. the challenge consists in faithfully implementing such computational models in software packages exploiting the potential trade-offs among usability, accuracy, and scalability when dealing with large amounts of data. the aim of this presentation is that of introducing some emerging problems and proposed solutions in this context. In particular, after an introductory first part, in the second part we will focus on the use of Hybrid systems in systems Biology. Hybrid systems are dynamical systems presenting both discrete and continuous evolution, originally proposed to study embedded systems, where a discrete control acts on a continuously changing environment. the presence of both discrete and continuous dynamics makes this formalism appealing also for modeling biological systems. However, the situation in this case is subtler, basically because there is no "natural" separation of discrete and continuous components. It comes as no surprise, therefore, that Hybrid systems have been used in systems Biology in rather various ways. Some approaches, like the description of biological switches, concentrate on the use of model-checking routines. Other applications, like the switching between continuous and discrete/stochastic simulation, focus on the exploitation of the interplay between discreteness and continuity in order to reduce the computational burden of numerical simulation, yet maintaining an acceptable precision. We will survey some of the main uses of Hybrid Automata in systems Biology, through a series of cases studies that we deem interesting and paradigmatic, discussing both actual and foreseeable, logical and implementation issues. © Springer-Verlag Berlin Heide

关键词： Hybrid systems

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Ontology based policy interoperability in geo-spatial domain

Ontology based policy interoperability in geo-spatial domain

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international conference on Data Engineering Workshops

作者： Mohammad Farhan Husain Mohmmad Alam Tahseen Al-Khateeb Latifur Khan Dept. of Computer Science & Engineering University of Texas at Dallas Richardson TX USA

With advances of digital technology two or more organizations form a federation for a temporary purpose. It is possible that an employee of an organization needs to access resource of another organization. While languages like XACML are very good for access control of a single organization, they are not able to address interoperability issues of such federations. Lack of interoperability of access control policies does not allow someone to access remote resources. In this paper we propose an approach by augmenting with knowledge-base, Ontology that will facilitate access control policies to provide resources of remote organizations. In addition, we introduce a new effect of the rule, partial permit in our application domain (Geo-Spatial).

关键词： Ontologies Access control computer security Software performance Humans computer science Authentication Authorization Terminology control systems

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On Skylining with Flexible Dominance Relation

On Skylining with Flexible Dominance Relation

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international conference on Data Engineering

作者： Tian Xia Donghui Zhang Yufei Tao College of Computer and Information Science Northeastern University Boston MA USA Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781424418367

Given a set of d dimensional objects, a skyline query finds the objects ("skyline") that are not dominated by others. However, skylines do not always provide useful query results to users, and existing methods of various skyline queries have at least one of the following drawbacks: (1) the size of skyline objects can not be controlled, or can be only increased or only decreased but not both ; (2) skyline objects do not have built-in ranks; (3) skylines do not reflect users' weights (preferences) at different dimensions. In this paper, we propose a unified approach, the epsiv -skyline, to effectively solve all three drawbacks. We explore the properties of epsiv -skylines and propose two different algorithms to compute epsiv -skylines.

关键词： Size control Information science computer science control systems

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Database, Heal thyself

Database, Heal Thyself

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24th international conference on Data Engineering Workshop (ICDE 2008), vol.1

作者： Rimma V. Nehme Department of Computer Science Purdue University West Lafayette IN USA

the ability of a database management system (DBMS) to detect problems or problem trends (which have not yet manifested as problems) and either take corrective actions, and/or provide advice or an automated notification to the database administrator (DBA) is absolutely crucial to ensure the "always-on" and "always-operational" environments. Any DBMS related failure could be prohibitively expensive and extremely damaging to business prospects. Today's database management systems primarily rely on DBAs to manually take corrective actions to minimize failures and provide robust platform to run applications. this approach is not very efficient, expensive and often not feasible. the goal of this paper is to outline several research directions and approaches that will lead to scalable and efficient self-healing database management systems. In this paper, we propose a general framework design, termed the Self-Healing Framework (SHF), that can enable automatic problem detection and problem resolution inside the database server, thus transforming the DBMS to become self-healing.

关键词： Database systems Automatic control Production computer science Robustness Statistical analysis Error analysis Capacity planning Query processing Knowledge management

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Auditing SQL Queries

Auditing SQL Queries

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international conference on Data Engineering

作者： Rajeev Motwani Shubha U. Nabar Dilys thomas Computer Science Department University of Stanford USA Google Inc. India

ISBN: (纸本)9781424418367;1424418364

We study the problem of auditing a batch of SQL queries: given a forbidden view of a database that should have been kept confidential, a batch of queries that were posed over this database and answered, and a definition of suspiciousness, determine if the query batch is suspicious with respect to the forbidden view. We consider several notions of suspiciousness that span a spectrum both in terms of their disclosure detection guarantees and the tractability of auditing under them for different classes of queries. We identify a particular notion of suspiciousness, weak syntactic suspiciousness, that allows for an efficient auditor for a large class of conjunctive queries. the auditor can be used together with a specific set of forbidden views to detect disclosures of the association between individuals and their private attributes. Further it can also be used to prevent disclosures by auditing queries on the fly in an online setting. Finally, we tie in our work with recent research on query auditing and access control and relate the above definitions of suspiciousness to the notion of unconditional validity of a query introduced in database access control literature.

关键词： Access control Database systems computer science Data privacy Polynomials

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