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International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Veena Safdar Faisal Bashir Zara Hamid Hammad Afzal Jae Young Pyun Dept. of Computer Science National University of Sciences and Technology (NUST) Islamabad Pakistan Dept. of Information & Communication Engineering Chosun University South Korea

Low power and lossy networks have been an active area of research due to their large number of potential applications in different environments like health, environment monitoring and entertainment domain. Numbers of protocols have been proposed for routing in these networks using metrics like hop count, delay, bandwidth etc. The working group of IETF has done one major contribution in form of a proactive gradient based routing protocol for low power and lossy networks (RPL). However, for a network having few mobile sinks calculating gradients using proactive approach is costly in terms of energy. This paper proposes a hybrid routing protocol for wireless sensor networks with mobile sinks. It proposes a combination of reactive and proactive approach to enhance RPL for efficiently handling movement of multiple sinks. DAGs are only maintained by nodes close to the sink within a certain zone. While the nodes outside the zone use on demand sink discovery to find the closest possible sink, without maintaining DAG. The frequency of zone creation messages and zone sizes can increase or decrease depending on the speed of sink. This helps to decrease the number of retransmissions resulting in low standing cost for maintain DAGs and enhances the network life time especially under average or high mobility of sink.

关键词： Routing protocols Mobile communication Wireless sensor networks Mobile computing Routing Educational institutions

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On the Computation of Supremal Sublanguages Relevant to Supervisory Control

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IFAC Proceedings Volumes 2012年第29期45卷 175-180页

作者： Thomas Moor Christine Baier Tae-Sic Yoo Feng Lin Stéphane Lafortune Lehrstuhl für Regelungstechnik Universität Erlangen-Nürnberg Idaho National Laboratory Idaho Falls Dept. of Electrical and Computer Engineering Wayne State University Detroit and School of Electronics and Information Engineering Tongji University Shanghai Dept. of Electrical Engineering and Computer Science The University of Michigan

Given a specification language, this paper discusses an iterative procedure for the computation of the supremal sublanguage, that possesses a conjunction of certain closed-loop properties, including controllability, normality and completeness. The iteration is stated in terms of (i) supremal sublanguage operators for each individual property, (ii) prefix-closures, and, (iii) language intersections. Within the iteration, the individual supremal sublanguage operators are only applied on prefix-closed languages, while the overall specification is not required to be prefix-closed. Our main result establishes finite convergence, provided that all parameters are regular.

关键词： discrete event systems supervisory control supremal sublanguages

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Reliable Wildfire Monitoring with Sparsely Deployed Wireless Sensor Networks

Reliable Wildfire Monitoring with Sparsely Deployed Wireless...

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International Conference on Advanced information Networking and Applications (AINA)

作者： Ikjune Yoon Dong Kun Noh Dongeun Lee Rony Teguh Toshihisa Honma Heonshik Shin School of Computer science and Engineering Seoul National University Korea Dept. of Computer Engineering Paichai University Daejeon Korea Graduate School of Information Science and Technology Hokkaido University Japan

This paper proposes a reliable wildfire monitoring system based on a wireless sensor network (WSN) sparsely deployed in adverse conditions. The physical environment under consideration is characterized by asymmetric, irregular, and unreliable wireless links, inadequate Fresnel zone clearance, and routing problems, to name a few. We use reliable communication schemes on a fault-tolerant network topology, where sensory data are guaranteed to reach the base station with organized data storage and real-time visualization. Our approach has been validated experimentally for the case of peat-forest wildfire in southern Borneo where the fire breaks out frequently.

关键词： Wireless sensor networks Reliability Routing Temperature sensors Fresnel reflection Algorithm design and analysis Monitoring

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Enabling data protection through PKI encryption in IoT m-Health devices

Enabling data protection through PKI encryption in IoT m-Hea...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Charalampos Doukas Ilias Maglogiannis Vassiliki Koufi Flora Malamateniou George Vassilacopoulos Dept. of Information and Communication Systems Engineering University of Aegean Dept. of Computer Science and Biomedical Informatics University of Central Greece Dept. of Digital Systems University of Piraeus Greece

Ambient Assisted Living (AAL) aims at providing unobtrusive support to frail and elderly people for their daily life based on their context and situation. To this end, systems and services are required which are user-centric and adaptable towards the needs and capabilities of the people in need of care. The continuous integration of leading-edge technologies, such as cloud and wireless communication technologies, in the context of the Internet of the Things (IoT), can meet this requirement by enabling a new form of communication between frail and elderly people, their environment and relevant groups of care givers. However, for IoT-based systems to reach their full potential, sound answers need to be provided to the important security questions arisen, particularly those regarding authentication of entities (people and environmental objects) and data privacy. This paper presents a system based on Gateways (GW) that aggregate health sensor data and resolve security issues through digital certificates and PKI data encryption.

关键词： Logic gates Wireless sensor networks Encryption Internet Wireless communication

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Correlating and cross-linking knowledge threads in Informledge System for creating new knowledge

Correlating and cross-linking knowledge threads in Informled...

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4th International Conference on Knowledge engineering and Ontology Development, KEOD 2012

作者： Nair, T.R. Gopalakrishnan Malhotra, Meenakshi Saudi Aramco Endowed Technology and Information Management PMU Al Khobar Saudi Arabia Advanced AI and Bio Computing RIIC D. S. Institutions Bangalore India Dept. of Computer Science Eng Oxford College of Engineering Bangalore India

ISBN: (纸本)9789898565303

There has been a considerable advance in computing, to mimic the way in which the brain tries to comprehend and structure the information to retrieve meaningful knowledge. It is identified that neuronal entities hold whole of the knowledge that the species makes use of. We intended to develop a modified knowledge based system, termed as Informledge System (ILS) with autonomous nodes and intelligent links that integrate and structure the pieces of knowledge. We conceive that every piece of knowledge is a cluster of cross-linked and correlated structure. In this paper, we put forward the theory of the nodes depicting concepts, referred as Entity Concept State which in turn is dealt with Concept State Diagrams (CSD). This theory is based on an abstract framework provided by the concepts. The framework represents the ILS as the weighted graph where the weights attached with the linked nodes help in knowledge retrieval by providing the direction of connectivity of autonomous nodes present in knowledge thread traversal. Here for the first time in the process of developing Informledge, we apply tenor computation for creating intelligent combinatorial knowledge with cross mutation to create fresh knowledge which looks to be the fundamentals of a typical thought process.

关键词： Knowledge based systems

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Systematic Literature Review of Missing Data Imputation Techniques for Effort Prediction

Systematic Literature Review of Missing Data Imputation Tech...

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2012 International Conference on Smart Grid Systems(ICSGS 2012)

作者： Beatrice Andrew Ali Selamat Dept. of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor 81310 Malaysia

Background:The occurrences of missing data in software project data set bring significant impact on effort *** significant impacts of this problem are wasted information and biased *** common studies conducted to investigate in dept. this area is to find sophisticated missing imputation techniques but there are only small numbers of research questioning the quality of ***:This paper aims to systematically analyze researches done on missing data imputation techniques to estimate software effort and review the current approaches exist in the ***:We performed a systematic literature of empirical studies of data imputation techniques published in from 2000-2012.

关键词： software effort prediction,imputation technique,systematic literature review

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Implementation of a Low-Cost Reconfigurable Antenna Array for SDR-based Communication Systems

Implementation of a Low-Cost Reconfigurable Antenna Array fo...

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IEEE Aerospace Conference

作者： Massimo Donelli Claudio Sacchi University of Trento Dept. of Information Engineering and Computer Science (DISI) Via Sommarive 5 Trento (Italy) I-38123

ISBN: (纸本)9781457705564

In the last years there has been a growing interest in software-defined radio communication systems (SDR). SDR technologies are attractive for communication systems because of their reconfigurable capabilities. Due to the complexity of real scenarios, usually characterized by multipath propagation and heterogeneous interfering sources, the antenna plays a key role. It is demonstrated by literature that the use of reconfigurable antennas (known also as smart antennas) could dramatically improve system performance. In this paper, we propose a compact and low-cost antenna array, based on microchip antennas, which will be integrated with a low-cost GNU-radio SDR testbed. The proposed antenna reconfigures its radiation characteristics, turning on/off the array elements, by means of radio frequency (RF) switches. The antenna is software controlled by means of a suitable optimization technique that maximizes the signal-to-noise ratio (SNR). Test results can prove the capability of the proposed antenna to improve the performance of SDR telecommunication systems in terms of increased SNR and reduced bit error rate.

关键词： COMMUNICATION SYSTEMS Array Element ANTENNA SDPR gene configurability Antenna arrays adaptive antenna arrays Multipath propagation radiation characteristic antennae Bit error rate signal to noise ratios System performance

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An OFDMA RRM Strategy Based on QoE Maximization and Radio Resource Redistribution

An OFDMA RRM Strategy Based on QoE Maximization and Radio Re...

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IEEE Aerospace Conference

作者： Fabrizio Granelli Claudio Sacchi University of Trento Dept. of Information Engineering and Computer Science (DISI) Via Sommarive 5 Trento (Italy) I-38123

ISBN: (纸本)9781457705564

The optimal allocation of power and subcarrier resources in Orthogonal Frequency Division Multiple Access (OFDMA) systems represents a hot topic widely dealt with in literature, given the need to balance the tradeoff between efficiency and fairness. Current state-of-the-art solutions are suboptimal. Indeed, efficiency often privileges users that can exploit favorable channel conditions, while fairness ignores the notion that different users might have different requirements. In this paper, we propose a balanced OFDMA Radio Resource Management (RRM) strategy targeted at maximizing the Quality-of-Experience (QoE), rather than Quality-of-Service (QoS). The proposed RRM is inspired by Game Theory and aims at maximizing the application-oriented Mean-Opinion Score (MOS). The proposed work is intended to go beyond the state-of-the-art by enabling flexibility and dynamicity through re-allocation of resources utilized by those users strongly disadvantaged by adverse channel conditions. The radio resources "wasted" by such users (not able to reach the required QoE level) can be reassigned to the remaining users in order to increase their MOS metrics. Preliminary results showed a sensible QoE increase for the users' population after the radio resource redistribution, in particular for low signal-to-noise ratios and larger number of users.

关键词： OFDMA Consumers optimal allocation Orthogonal frequency division multiplexing Radio Game theory signal to noise ratios Quality of service

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Compiler Optimization to Reduce Cache Power with Victim Cache

Compiler Optimization to Reduce Cache Power with Victim Cach...

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International Conference on Ubiquitous Intelligence & Computing

作者： Cheng-Yu Lee Jen-Chieh Chang Rong-Guey Chang Dept. of Computer Science and Information Engineering & Advanced Institute of Manufacturing with High-tech Innovations National Chung Cheng University

ISBN: (纸本)9781467330848

Victim cache can buffer blocks discarded from the cache on a miss before going to the next lower-level memory to improve performance. Compared with the previous work, rather than only improve performance, we design a modified victim cache to reduce power consumption by minimizing accesses to L2 cache, miss rate, and miss penalty in this paper. With the help of this new victim cache, we can turn on/off cache block in a software way to save power and improve performance. The proposed approach can analyze an application, perform scheduling, and then insert the instrumention instructions in the code to control victim cache. The results shows that the proposed approach can improve performance about 6.5%, reduce 32.66% of cache miss, and save 4.19% of power consumption with 2k direct-mapped cache at the cost only of 1.9% code expansion on average.

关键词： Compiler Optimization Cache Low-power Victim cache

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Bringing IoT and Cloud Computing towards Pervasive Healthcare

Bringing IoT and Cloud Computing towards Pervasive Healthcar...

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International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS)

作者： Charalampos Doukas Ilias Maglogiannis Dept. of Information & Communication Systems Engineering University of the Aegean Samos Greece Dept. of Computer Science & Biomedical Informatics University of Central Greece Lamia Greece

ISBN: (纸本)9781467313285

Pervasive healthcare applications utilizing body sensor networks generate a vast amount of data that need to be managed and stored for processing and future usage. Cloud computing among with the Internet of Things (IoT) concept is a new trend for efficient managing and processing of sensor data online. This paper presents a platform based on Cloud Computing for management of mobile and wearable healthcare sensors, demonstrating this way the IoT paradigm applied on pervasive healthcare.

关键词： Cloud computing Medical services Clouds Biomedical monitoring Mobile communication Real time systems

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