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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Arunabha Sen Anisha Mazumder Joydeep Banerjee Arun Das Randy Compton Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe Arizona

The critical infrastructures of a nation including the power grid and the communication network are highly interdependent. Recognizing the need for a deeper understanding of the interdependency in a multi-layered network, significant efforts have been made by the research community in the last few years to achieve this goal. Accordingly a number of models have been proposed and analyzed. Unfortunately, most of the models are over simplified and, as such, they fail to capture the complex interdependency that exists between entities of the power grid and the communication networks involving a combination of conjunctive and disjunctive relations. To overcome the limitations of existing models, we propose a new model that is able to capture such complex interdependency relations. Utilizing this model, we provide techniques to identify the K most “vulnerable” nodes of an interdependent network. We show that the problem can be solved in polynomial time in some special cases, whereas for some others, the problem is NP-complete. We establish that this problem is equivalent to computation of a fixed point of a multilayered network system and we provide a technique for its computation utilizing Integer Linear programming. Finally, we evaluate the efficacy of our technique using real data collected from the power grid and the communication network that span the Maricopa County of Arizona.

关键词： Equations Communication networks Mathematical model Power grids Power system faults Power system protection Nonhomogeneous media

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On the impact of coding parameters on storage requirement of region-based fault tolerant distributed file system design

On the impact of coding parameters on storage requirement of...

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International Conference on Computing, Networking and Communications (ICNC)

作者： Sujogya Banerjee Arun Das Anisha Mazumder Zahra Derakhshandeh Arunabha Sen Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe Arizona

Advances in technology have resulted in Internet-scale deployment of storage systems such as peer-to-peer storage and cloud storage, where data is distributed over multiple storage nodes in a networked environment. In these environments the storage nodes are often commodity machines and are susceptible to failure. The notion of fault domain, introduced by Microsoft Azure, captures the fault-tolerance aspects of a data center. A fault domain is defined as a set of servers all of which become inaccessible when a single fault (such as the failure of a switch or a router) occurs in the data center. As such a fault domain can be viewed as a spatially correlated or region based failure. In order to enhance reliability through redundancy, maximum distance separable (MDS) codes such as Reed-Solomon codes and (N, K) codings are utilized. In this paper we present analytical results demonstrating that the choice of the coding parameters N and K may have significant impact on storage that will be necessary to achieve reliability. We present a polynomial time algorithm for optimal storage allocation in a mesh network and we conduct extensive experimentation to evaluate the impact of the coding parameters N and K on the storage requirement to provide all region fault tolerance with varying size of the mesh and the fault region.

关键词： Color Image color analysis Encoding Silicon Peer-to-peer computing Fault tolerant systems Fault tolerance

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Root Cause Analysis of Failures in Interdependent Power-Communication Networks

Root Cause Analysis of Failures in Interdependent Power-Comm...

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MILCOM, Military Communications Conference

作者： Arun Das Joydeep Banerjee Arunabha Sen Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe Arizona

ISBN: (纸本)9781479967711

Studies on communication network robustness, though extensive, have primarily focused on standalone networks. However, real world communication networks do not operate in isolation, but instead are part of complex interdependent ecosystems that function together as a comprehensive symbiotic unit. For instance, communication networks of today are highly dependent on the power infrastructure and hence, any efforts to improve the robustness of communication networks must necessarily take into account the vulnerabilities of the power infrastructure and their shared interdependencies. For example, event-induced failures (failures caused by natural disasters or terrorist attacks), on any of these two infrastructures can trigger further failures (triggered failures) into the system through a cascading process due to the interdependencies between the networks. In such an interdependent system where an event induced failure can cascade and result in a much larger combined (event-induced plus triggered) failure, it may be imperative to identify the original event-induced failure for the purpose of post fault diagnostics, or for pre-cascade network strengthening. This ascertainment of event-induced original failure, or the Root Cause of Failure, from combined failures in interdependent Power-Communication networks is the main focus of this paper. We model interdependencies between the two infrastructures using the recently proposed Implicative Interdependency Model. We introduce the Root Cause of Failure problem, and prove it to be NP-Complete. We also provide optimal solutions using ILP, and provide an O(ln(n)) approximation algorithm. Finally, we validate our analytical results through experiments in the power communication network of Maricopa County, Arizona.

关键词： Communication networks Silicon Approximation algorithms Computational modeling Power system faults Power system protection Approximation methods

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PAPR reduction in an OFDM system using recursive clipping and filtering technique

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WSEAS Transactions on Communications 2014年第1期13卷 291-297页

作者： Islam, Anamul Ahmed, N. Ahamed, Nizam Uddin Rahman, Matiur Aljunid, S.A. Dept. of Applied Physics and Electronic Engineering University of Rajshahi Bangladesh School of Computer and Communication Engineering University Malaysia Perlis Malaysia Biomedical Engineering Program Mechatronic Engineering University Malaysia Perlis Malaysia College of Computer Science and Information System Najran University Saudi Arabia

An Orthogonal Frequency Division Multiplexing (OFDM) scheme is expected as an efficient technique for next generation wireless communications. However, high Peak to Average Power Ration (PAPR) of OFDM system is the main drawback which degrades the transmitter power efficiency causes poor performance of the system. To reduce PAPR of OFDM signal, several works on clipping technique have been proposed. This paper is incorporated the improvement of the PAPR and Bit Error Rate (BER) performance using clipping method. It has been shown from the result that by employing the recursive clipping and filtering, 11.45 dB of PAPR of original OFDM signal is reduced down to 4.77 dB. Hence, BER is also increased significantly. This research is carried out through MATLAB simulation and gradually measured the effect of PAPR on BER under AWGN channel for 16QAM scheme with 256 points OFDM. Moreover, it is studied the effect of OFDM signal while passing through High Power Amplifier (HPA). Finally, the PAPR reduction technique such as recursive clipping and filtering (RCF) is implemented.

关键词： Orthogonal frequency division multiplexing

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Extracting Semantic Information from Patent Claims Using Phrasal Structure Annotations

Extracting Semantic Information from Patent Claims Using Phr...

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Brazilian Conference on Intelligent systems (BRACIS)

作者： Danilo Silva de Carvalho Felipe Maia Galvão França Priscila Machado Vieira Lima Systems Engineering and Computer Science Program-COPPE Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Instituto Tércio Pacitti (NCE) Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil

The rapid change of trading values from tangible assets to Intelectual Property has put both businesses and academia in a race to acquire and protect the rights to exploit such property. This is mainly accomplished in the form of patent issuing by the governments, being time consuming and complicated due to the vast amount of documents that need to be analyzed in order to assert the novelty or validity of a patent application. Patent information retrieval research is thus growing quickly to support document analysis across multiple domains and information systems. One of the big challenges in patent analysis is the identification of the elements of innovation (concepts, processes, materials) and the relations between them, in the patent text. This paper presents a method for extracting semantic information from patent claims by using semantic annotations on phrasal structures, abstracting domain ontology information and outputting ontology-friendly structures to achieve generalization. An extraction system built upon the method is briefly evaluated on a document sample from INPI, the Brazilian patent office, a challenging information source.

关键词： Semantics Patents Syntactics Data mining Training Ontologies Testing

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From applications to a software ecosystem platform: An exploratory study 13

From applications to a software ecosystem platform: An explo...

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5th International Conference on Management of Emergent Digital Ecosystems, MEDES 2013

作者： Costa, Gabriella Silva, Felyppe Santos, Rodrigo Werner, Cláudia Oliveira, Toacy System Engineering and Computer Science COPPE University of Rio de Janeiro 21945-970 - Rio de Janeiro Brazil

ISBN: (纸本)9781450320047

The essence of the software ecosystem concept encourages external developers to interact with a software platform, enabling them to contribute or evolve such platform. Trying to expand a product into a platform on which components, services and applications can be created, a company may provide the basis for an ecosystem and its life cycle. In this paper, we describe the evolution process of an application towards an ecosystem using current models and taking into account the reuse of an existing software system. The application DiaDia has been developed for smartphones and its main function consists in helping the treatment of diabetic patients. Two different models are used to discuss the transition of the application to an ecosystem: one is an adaptation of the Software Supply Network which represents the main actors that interact with the ecosystem, and the other covers the process of creating an application and its evolution to an ecosystem through Business Process Model and Notation. © 2013 ACM.

关键词： Ecosystems

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A Brechó-EcoSys extension to support negotiation in the software ecosystems context

A Brechó-EcoSys extension to support negotiation in the sof...

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2013 IEEE 14th International Conference on Information Reuse and Integration, IEEE IRI 2013

作者： Dos Santos, Rodrigo Pereira Tostes, Lucas Rodrigues Werner, Claudia Maria Lima System Engineering and Computer Science Department COPPE - Federal University of Rio de Janeiro Zip Code 21945-970 - Rio de Janeiro Brazil

ISBN: (纸本)9781479910502

The treatment of economic and social issues in Software engineering was pointed out as a challenge in the coming years. Organizations have opened up their platforms and assets to others, including partners and third-party developers around the world, generating software ecosystems (SECOs). SECOs research can contribute to minimize nontechnical barriers of software reuse in industry because it explores potential relations among companies and stakeholders. However, an inhibitor is the complexity in defining value for reusable assets. This paper presents an extension of the Brechó-EcoSys environment to support components negotiations in reuse repositories. The focus is on complementing the stakeholders' value proposition and realization, as well as incorporating a nontechnical mechanism in components repositories. © 2013 IEEE.

关键词： computer software reusability

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On the impact of software ecosystems in requirements communication and management

On the impact of software ecosystems in requirements communi...

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Requirements engineering@Brazil, ER@BR 2013

作者： Dos Santos, Rodrigo Pereira Werner, Cláudia Maria Lima System Engineering and Computer Science Department PESC/COPPE Federal University of Rio de Janeiro Rio de JaneiroZip Code 21945-970 Brazil

The treatment of economic and social issues in Software engineering was pointed out as a challenge for the next years. Companies and organizations have directly (or not) opened up their software platforms and assets to others, including partners and third-party developers around the world, generating software ecosystems (SECOs). This changes the traditional software industry because it requires mature research in software requirements and architecture in an environment where business models and socio-technical networks can impact the management of the platforms' needs and demands overtime. However, one strong inhibitor is the complexity in defining and modeling SECOs elements to improve their comprehension and analysis and their impacts on requirements engineering. So, this paper introduces an approach to support SECO definition and modeling based on the SECOs domain. The goal consists in dealing with the stakeholders' value proposition and realization in SECOs, as well as treating nontechnical issues in components and social repositories.

关键词： Requirements engineering

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A reconfigurable ray-tracing Multi-Processor SoC with hardware replication-aware instruction set extension

A reconfigurable ray-tracing Multi-Processor SoC with hardwa...

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13th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2013

作者： Nery, Alexandre S. Nedjah, Nadia França, Felipe M.G. Jozwiak, Lech Corporaal, Henk LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Federal University of Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering State University of Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands

ISBN: (纸本)9783319038582

Application code and processor parallelization, together with instruction set customization, are the most common and effective ways to enhance the performance and efficiency of application-specific processors (ASIPs). Both the effective code parallelization and data/task parallelism exploitation, as well as effective instruction set customization, enable an ASIP to achieve a significant performance improvement using limited extra hardware resources. However, a naive parallelization or instruction set customization may not result in the required performance improvement, leading to a waste of computing and energy resources. Therefore, when performing parallelization or custom instruction selection, complex tradeoffs between processing speed, circuit area and power consumption must be closely observed. In this paper, we propose and discuss an efficient ASIP-based Multi-Processor system-on-a-Chip (MPSoC) design for ray-tracing, exploiting application parallelism and hardware replication-aware instruction set customization. Without hardware sharing among the custom instructions units, the proposed parallel ray-tracer MPSoC design with custom instructions achieves 77% speed up in comparison to a single microprocessor design with the default instruction set. However, with the replication-aware instruction set customization, the speed up increases to 81%. © Springer International Publishing Switzerland 2013.

关键词： Integrated circuit design

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A Brechó-EcoSys extension to support negotiation in the software ecosystems context

A Brechó-EcoSys extension to support negotiation in the sof...

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IEEE International Conference on Information Reuse and Integration (IRI)

作者： Rodrigo Pereira dos Santos Lucas Rodrigues Tostes Cláudia Maria Lima Werner System Engineering and Computer Science Department COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil

关键词： Software Ecosystems Software engineering Organizations Context Documentation

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