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Redundancy and coverage detection in wireless sensor networks in the presence of obstacles

Redundancy and coverage detection in wireless sensor network...

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Proceedings of the International Convention MIPRO

作者： Azade Fotouhi Mohammadreza Razzazi Software Systems Research and Development Laboratory Department of Computer Engineering & IT Amirkabir University of Technology슠 Tehran Iran

In the real applications of wireless sensor networks (WSNs), a great number of sensors are distributed in the region of interest in order to monitor the environment. The area covered and the energy consumed by the sensors are two key problems of the WSNs. There are several efforts which tried to find the coverage percentage of the network, and eliminate the redundant sensors; however, none of them have considered the presence of obstacles in the region of interest. In this paper, we propose a new efficient algorithm to compute the area covered by the sensors in a region containing transparent and opaque obstacles, and study the problem of detecting and eliminating redundant sensors in order to improve energy efficiency, while preserving the network's coverage. The proposed algorithm uses computational geometry techniques and is applicable for both homogeneous and heterogeneous WSNs. Also, the obstacles can have arbitrary polygonal shapes which are placed in arbitrary locations.

关键词： Sensors Face Wireless sensor networks Redundancy Algorithm design and analysis Conferences Computational geometry

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A passive bistatic radar for detection of aircraft using spaceborne transmitters

A passive bistatic radar for detection of aircraft using spa...

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Conference on Digital Avionics systems (DASC)

作者： William C. Barott Brian Butka Electrical Computer Software and Systems Engineering Department Embry-Riddle Aeronautical University Daytona Beach FL USA

This research reports on the construction of a demonstration platform for a passive ground-based primary radar station for monitoring aircraft. The key to the system is the use of existing satellite transmitters as illuminators for the radar system. This proposed system can provide accurate position and velocity measurements of aircraft or small unmanned aircraft at ranges of tens to hundreds of nautical miles away from the ground station. This station is a light-weight, low-cost, portable, and field-deployable option to supplement deficiencies in the National Airspace System (NAS) and homeland security surveillance networks. Potential applications include providing coverage in remote mountainous regions, low-altitude en-route primary radar coverage throughout the continental United States, and low-altitude interdiction efforts in coastal areas. As a field-deployable system, this could also be used to quickly restore primary radar coverage in the event that a disaster or terrorist event disables existing primary radars. Additionally, the portable and non-emitting nature of the radar permits use in a wide range of applications where emitting radars are unacceptable. Previous research in the area of passive radar has used terrestrial sources as illuminators since satellite sources have been traditionally viewed as too weak. What makes this research unique is that it takes specialized signal processing techniques typically used to detect objects in deep space for radio astronomy applications and applies them to the domain of terrestrial bistatic radar. The system has been constructed and characterization of system performance is in process.

关键词： Spaceborne radar Aircraft Radio transmitters Airborne radar Passive radar Satellites

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Applying particle swarm optimization to software performance prediction an introduction to the approach

Applying particle swarm optimization to software performance...

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Malaysian Conference in software engineering (MySEC)

作者： Adil A. A. Saed Wan M. N. Wan Kadir Faculty of Computer Science & Information Systems Department of Software Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

Component-Based System (CBS) is an approach to build applications from deployed components. It provides efficiency, reliability, maintainability. The challenge of interpreting the results of performance analysis and generate alternative design to build component system is quite critical in the software performance domain. Although, many approaches have been proposed and were successfully applied to predict software performance, still span of design space hinder the selection of the appropriate design alternative. Meta-heuristics such as Genetic Algorithms (GA) methods have proven its usefulness to solve the problem even with multi-degree of freedom. But, in recent investigations Particle Swarm Optimization (PSO), an alternative search technique, often outperformed GA when applied to various problems. In this paper we describe performance prediction approach based on PSO for component-Based system development. The proposed approach aids developers to effectively trades-off between architectural designs alternatives. Boundary search technique and PSO are used to provoke more efficient results. To the best of our knowledge we are the first who employ PSO in software performance prediction. Outlines of our approach are presented and a case study applied using GA is described to be used by our approach for validation. This paper has concluded that, PSO technique can be used to effectively generate alternatives in spanned design space and facilitate the design decision during the development process.

关键词： Genetic algorithms computer architecture software performance Optimization Search problems Particle swarm optimization

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Ontology of moodle e-learning system for social network analysis

Ontology of moodle e-learning system for social network anal...

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IEEE Conference on Open systems (ICOS)

作者： Norazah Yusof Andi Besse Firdausiah Mansur Mohd Shahizan Othman Department of Software Engineering Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Johor Malaysia Department of Information Systems Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Johor Malaysia

The analysis using Social Network Analysis (SNA) is focusing more on the number or the frequency of social interactions based on adjacency matrix. This method cannot be used to observe the semantic relationship among e-Learning components. Therefore, this paper aims to propose a new paradigm of Social Network Analysis (SNA) using ontology structure of Moodle e-Learning. By considering the relationship of ontology, we can understand the meaning of semantic relationship more deeply. The ontology of Moodle e-learning system for social network analysis will become great advantage to make measurement not only based on the matrix or number of interactions but also based on the semantic meaning of the relationships among users.

关键词： Social network services Ontologies Electronic learning Open systems Semantics Conferences Internet

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Substantiating Agent-Based Quality Goals for Understanding Socio-Technical systems 11

Substantiating Agent-Based Quality Goals for Understanding S...

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International Conference on Autonomous Agents and Multiagent systems

作者： Sonja Pedell Tim Miller Leon Sterling Frank Vetere Steve Howard University of Melbourne Department of Information Systems University of Melbourne Department of Computer Science and Software Engineering Swinburne University Faculty of ICT

ISBN: (纸本)9783642272158

In this paper we propose a method for using ethnographic field data to substantiate agent-based models for socially-oriented systems. We use the agent paradigm because the ability to represent organisations, individuals, and interactions is ideal for modelling socio-technical systems. We present the results of in-situ use of a domestic application created to encourage engagement between grandparents and grandchildren separated by distance. In such domains, it is essential to consider abstract and complex quality requirements such as showing presence and sharing fun. The success of such domestic technologies is based on the meaningful realisation of these difficult-to-define quality goals. Our method addresses the need to adequately inform these quality goals with field data. We substantiate the quality goals with field data collected by introducing an application into the home of three families. The field data adds an understanding of what sharing fun means when "filled" with concrete activities. The quality goals served as a template to explore and represent the rich field data, while the field data helped to formulate the requirements for a more complex and refined technology. This paper's contribution is twofold. First, we extend the understanding of agent-oriented concepts by applying them to household interactions. Second, we make a methodological contribution by establishing a new method for informing quality goals with field data.

关键词： Socially-oriented requirements Ethnography Quality goals Field data Ethnography Grandchildren Grandparents

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Relational-model based change management for non-functional requirements: Approach and experiment

Relational-model based change management for non-functional ...

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International Conference on Research Challenges in Information Science, RCIS

作者： M. Kassab O. Ormandjieva M. Daneva Department of Software Engineering and Computer Science Concordia University Montreal Canada Department of Information Systems University of Twente Enschede Netherlands

In software industry, many organizations either focus their traceability efforts on Functional Requirements (FRs) or else fail entirely to implement an effective traceability process. Non-Functional Requirements (NFRs) such as security, safety, performance, and reliability are treated in a rather ad hoc fashion and are rarely traced. This is mainly because of the unique nature of NFRs. They are subjective, relative and they tend to become scattered among multiple modules when they are mapped from the requirements domain to the solution space. Furthermore, NFRs can often interact, in the sense that attempts to achieve one NFR can help or hinder the achievement of other NFRs at particular software functionality. Such an interaction creates an extensive network of interdependencies and tradeoffs among NFRs which is not easy to trace. In a previous work, we proposed a conceptualization of NFRs through the NFRs Ontology. In this paper, we extend the previous work by proposing a change management mechanism for tracing the impact of NFRs on the other constructs in the ontology such as FR or NFR operationalization and vice versa, and providing a traceability mechanism using Datalog expressions to implement queries on a relational model-based representation for the ontology. The proposed traceability queries are then evaluated through a multi-project variation quasi-experiment on regression testing conducted in the industry.

关键词： Security

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An analysis of signature overlaps in Intrusion Detection systems

An analysis of signature overlaps in Intrusion Detection Sys...

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International Conference on Dependable systems and Networks (DSN)

作者： Frédéric Massicotte Yvan Labiche Communications Rcscarch Centre Ottawa Canada Software Quality Engineering Laboratory Department of Systems and Computer Engineering Carleton University Ottawa Canada

An Intrusion Detection System (IDS) protects computer networks against attacks and intrusions, in combination with firewalls and anti-virus systems. One class of IDS is called signature-based network IDSs, as they monitor network traffic, looking for evidence of malicious behaviour as specified in attack descriptions (referred to as signatures).Many studies report that IDSs, including signature-based network IDSs, have problems to accurately identify attacks. One possible reason that we observed in our past work, and that is worth investigating further, is that several signatures (i.e., several alarms) can be triggered on the same group of packets, a situation we coined overlapping signatures. This paper presents a technique to precisely and systemat ically quantify the signature overlapping problem of an IDS signature database. The solution we describe is based on set theory and finite state automaton theory, and we experiment with our technique on one widely-used and maintained IDS. Results show that our approach is effective at systematically quantifying the overlap problem in one IDS signature database, and can be potentially used on other IDSs.

关键词： Payloads Databases Automata Protocols Set theory Intrusion detection Systematics

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Transmission control policy design for decentralized detection in tree topology sensor networks

Transmission control policy design for decentralized detecti...

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International Conference on Information Fusion

作者： Ashraf Tantawy Xenofon Koutsoukos Gautam Biswas Institute of Software Integrated Systems (ISIS) and Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

A Wireless Sensor Network (WSN) deployed for detection applications has the distinguishing feature that sensors cooperate to perform the detection task. Therefore, the decoupled design approach that is typically used to design communication networks, where each network layer is designed independently, does not lead to the desired optimal detection performance. Cross-layer design has been recently explored for the design of MAC protocols for parallel topology (single hop) networks, but little work has been done on the integration of communication and information fusion for tree networks. In this work, we design the optimal Transmission Control Policy (TCP) that coordinates the communication between sensor nodes connected in a tree configuration, in order to optimize the detection performance. We integrate the Quality of Information (QoI), Channel State Information (CSI), and Residual Energy Information (REI) for each sensor into the system model. We formulate a constrained nonlinear optimization problem to find the optimal TCP design variables. We solve the optimization problem using a hierarchical approach where smaller local optimization problems are solved by each parent node to find the optimal TCP design variables for its child nodes. We compare our design with the max throughput and decoupled design approaches.

关键词： Wireless sensor networks Wireless communication Topology Network topology Optimization Media Access Protocol

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Resource Provisioning Policies to Increase IaaS Provider's Profit in a Federated Cloud Environment

Resource Provisioning Policies to Increase IaaS Provider's P...

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IEEE International Conference on High Performance Computing and Communications (HPCC)

作者： Adel Nadjaran Toosi Rodrigo N. Calheiros Ruppa K. Thulasiram Rajkumar Buyya Cloud Computing and Distributed Systems (CLOUDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia Department of Computer Science University of Manitoba Canada

Cloud Federation is a recent paradigm that helps Infrastructure as a Service (IaaS) providers to overcome resource limitation during spikes in demand for Virtual Machines (VMs) by outsourcing requests to other federation members. IaaS providers also have the option of terminating spot VMs, i.e, cheaper VMs that can be canceled to free resources for more profitable VM requests. By both approaches, providers can expect to reject less profitable requests. For IaaS providers, pricing and profit are two important factors, in addition to maintaining a high Quality of Service (QoS) and utilization of their resources to remain in the business. For this, a clear understanding of the usage pattern, types of requests, and infrastructure costs are necessary while making decisions to terminate spot VMs, outsourcing or contributing to the federation. In this paper, we propose policies that help in the decision-making process to increase resources utilization and profit. Simulation results indicate that the proposed policies enhance the profit, utilization, and QoS (smaller number of rejected VM requests) in a Cloud federation environment.

关键词： Outsourcing Quality of service Mathematical model Equations Pricing Computational modeling Availability

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Pro-active Advice to Improve the Efficiency of Self-Organizing Emergent systems

Pro-active Advice to Improve the Efficiency of Self-Organizi...

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IEEE Workshop on engineering of Autonomic and Autonomous systems (EASE)

作者： Torsten Steiner Jörg Denzinger Holger Kasinger Bernhard Bauer Institute of Software and Systems Engineering University of Augsburg Augsburg Germany Department of Computer Science University of Calgary Calgary Canada

An advisor autonomously improves the efficiency of self-organizing emergent multi-agent systems at runtime. It identifies tasks that the system has to perform recurringly. If the system performs these tasks inefficiently, the advisor will create so-called exception rules for the agents that enable them to perform these tasks more efficiently in the future. In contrast to the previously presented concept of ignore rules, a type of exception rule which only keeps the agents from doing certain tasks, in this paper we present the concept of pro-active rules. This type of exception rule allows the advised agents to already prepare for tasks before they are even announced to the system. Our experimental evaluation shows that a combination of these two rule types for the domain of dynamic pickup and delivery problems utilizes the advantages of both, improves previously badly handled problem instances, and additionally offers slight improvements for randomly created instances.

关键词： History Transportation Transforms Clustering algorithms computer architecture Multiagent systems Approximation methods

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