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36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, ACRS 2015

作者： More, Ravina Kale, Neha Kataria, Garima Yadav, Piyush Deshpande, Shailesh Dep. Computer Engineering Maharashtra Institute of Technology Savitribai Phule Pune University India TATA Research Development and Design Centre 54-B Hadapsar Industrial Estate Pune411013 India

Soaring temperatures of cities due to urbanisation leading to possible formation of an Urban Heat Island (UHI) is becoming a growing concern for India, a developing country, with the 2nd highest population in the world. Pune is no exception to that. Over the last few decades, the increasing urban landscape of the Pune city has led to fluctuations in the daily temperatures and disturbance in the thermal fluxes. To understand the nature and the consequences of this phenomenon, it is imperative to study the temperature changes and come up with a model that can quantify these changes. Whereas numerous studies have made use of satellite images for UHI analysis, only a few of these have paid significant attention to the analysis of long term changes. Our research aims to study the temperature profile of Pune city with the help of the Landsat-7 satellite imagery. The Land Surface Temperature (LST) and Land Use Land Cover (LULC) data extracted from these images is compared to find the correlation between the two. We used Hilbert Huang Transform (HHT) for analysing trends across the North-South and East-West extent of the city. The results are then compared with the Vegetation, Impervious and Soil (VIS) classification of the cross section to identify the relation of the trend with the classification. The results obtained show that the areas with residential, industrial have an average surface temperature of around 46 °C. That is higher by 2-3 degree on an average (5-6 degree worst case) than immediate surrounding vegetated region - indicating mild urban heat island effect. But because of physical geography of the region the outermost surrounding is covered with barren land, dry grass open area etc. and have similar temperatures to that of core of the city. Thus the observations indicate very specific temperature variation along the North-South and East-West cross sections of the city.

关键词： Surface temperature

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Distributed Fault Detection Using Relative Information in Linear Multi-Agent Networks

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IFAC-PapersOnLine 2015年第21期48卷 446-451页

作者： Silvestre, Daniel Rosa, Paulo Hespanha, Joäo P. Silvestre, Carlos Dep. of Electrical and Computer Engineering Instituto Superior Técnico ISR 1046-001 Lisboa Portugal Deimos Engenharia Lisbon Portugal Dept. of Electrical and Computer Eng. University of California Santa Barbara CA 93106-9560 United States Department of Electrical and Computer Engineering of the Faculty of Science and Technology of the University of Macau Macao China on leave from Instituto Superior Técnico/Technical University of Lisbon Lisbon 1049-001 Portugal

This paper addresses the problem of fault detection in the context of a collection of agents performing a shared task and exchanging relative information over a communication network. A techniques in the literature is used to construct a meaningful observable system equivalent to the original unobservable system of systems. A solution involving Set-Valued Observers (SVOs) and a left-coprime factorization of the system is proposed to estimate the state in a distributed fashion and a proof of convergence of the estimates is given under mild assumptions. The performance of the detection algorithm against deterministic and stochastic faults;and when the system is subject to unmodeled disturbances is assessed through simulations. © 2015

关键词： Linear systems

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Conducted EMI reduction of a soft-single-switched boost converter using heat-sink capacitance cancellation

Conducted EMI reduction of a soft-single-switched boost conv...

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Power Electronic and Drive Systems and Technologies Conference (PEDSTC)

作者： Mohammad Rouhollah Yazdani Maryam Alirezaei Hosein Farzanehfard Dep. of Electrical Engineering Islamic Azad University Isfahan Iran Dep. of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran

ISBN: (纸本)9781479976546

Conventional power supplies are considered as sources of electromagnetic interference. Increasing use of power converters leads to the need of electromagnetic emissions. Although soft switching methods are addressed to reduce electromagnetic emissions, the amount of EMI reduction may not be enough which leads to employ another EMI reduction methods. In this paper, a pulse width modulation soft-single-switched boost converter is modeled from conducted EMI viewpoint and its conducted EMI is predicted. To reduce EMI, a EMI reduction technique based on cancellation of the switch parasitic capacitor is investigated. This technique is applied to the converter and conducted EMI is simulated. The comparison between simulation results shows a considerable reduction in conducted EMI levels after applying this technique.

关键词： Switches Electromagnetic interference Electromagnetic compatibility Logic gates Pulse width modulation

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Derivation of AC small signal model and analysis of trans Z-source inverter

Derivation of AC small signal model and analysis of trans Z-...

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Iranian Conference on Electrical Engineering (ICEE)

作者： Mehran Moslehi Bajestan Mohammad Ali Shamsinejad Davood Arab Khaburi Dep. of Electrical and Computer Engineering University of Birjand Birjand Iran Dep. of Electrical Engineering Iran University of Science and Technology Tehran Iran

This paper presents the ac small signal modeling and analysis of trans Z-Source inverter (trans ZSI). Trans ZSI has been derived from quasi Z-source converter recently. While maintaining all prominent features of pervious Z-source inverters, trans ZSI has several unique advantages such as increased voltage gain, reduced voltage stress and reduced components of impedance network. In the process of designing control schemes for the trans ZSI, knowledge of the transfer function representing its unique dc impedance network is essential. In particular, the state space averaging method is employed to deduce the transfer functions. These transfer functions reveal the presence of right half plane (RHP) zero, which imposes some limitations on controller design. The RHP zero trajectories with variations in network parameters can be studied using classical root-locus analyses. Considering system dynamic characteristics, the trans ZSI design guidelines for passive component sizing is investigated by parameter sweeping of the small signal model based transfer functions. Simulation results are presented to verify the dynamic modeling identified in this paper.

关键词： Inverters Electrical engineering Poles and zeros Capacitors Damping Analytical models

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STESCAL3D: Subjective evaluation of HD stereo video streaming using H.264 SVC in diverse laboratory environments

STESCAL3D: Subjective evaluation of HD stereo video streamin...

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International Workshop on Quality of Multimedia Experience, QoMEx

作者： Charalampos Mysirlidis Tasos Dagiuklas Pedro M. R. Rocha Luis A. Da Silva Cruz Dino Kotaranin Savina Gruicic Emil Dumic Athanassios Skodras School Science & Technology Hellenic Open University Patras Greece Dep. of Wireless Communications University of Zagreb Zagreb Croatia Dep. of Electrical and Computer Engineering University of Coimbra Coimbra Portugal Dep. of Electrical and Computer Engineering University of Patras Patras Greece

This paper presents a new 3D video database (STESCAL3D -Stereoscopic Scalable 3D), made up of 3D stereo video sequences affected by different types of degradations. A set of subjective quality grades have been collected in three geographically displaced sites. The database contents have been produced using scalable video coding to encode 3D stereo video clips with distinct encoding parameters, after which different transmission degradations have been applied to the encoded video streams. These sequences have been subjectively evaluated by observers from three countries, Croatia, Portugal and Greece, using a purpose-built web-based platform. The subjective quality data compiled were processed, analyzed and compared to quality estimates obtained using several well-known objective measures. It is shown that the correlation between objective quality estimates and the subjective quality grades is in general low. Additionally the results show that stereo-view asymmetries in terms of encoding parameters and packet loss ratio (PLR) leads to low quality of experience. The video database and the subjective grades collection are publicly available with the referral link provided in the text.

关键词： Three-dimensional displays Streaming media Observers Video sequences Databases Encoding Correlation

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Using Combined Cellular Ad Hoc Communications for Smart Environments

Using Combined Cellular Ad Hoc Communications for Smart Envi...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Mimoza Durresi Arjan Durresi Leonard Barolli Kazunori Uchida Dep. of IT Mathematics and Statistics European University of Tirane Tirana Albania Dep. of Computer Science IUPUI Indianapolis USA Dep. of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan

ISBN: (纸本)9781479917761

We propose a Heterogeneous Multi Domain (HMD) architecture and protocols that uses ad hoc and cellular communications for enabling the exchange of information among users and smart environments. In particular, we focuss on the data communication and information diffusion related to tourism industry. Sensor's technology enables today the collection of various data related to the environment, such as temperature, location, and so on. This information can be delivered timely to users interacting with the environment. For example, a user might get direction in a building or in a park. Our architecture uses a network of gateways as an hierarchical virtual infrastructure to interconnect various network domains. Gateways are responsible for translation among different communication protocols, including routing, signalling, and security. HMD architecture is scalable, flexible and adaptive to QoS needs for interdomain communications. The protocol goal is to optimize such communications in terms of performance.

关键词： Logic gates Protocols Ad hoc networks Routing Smart phones Delays Wireless sensor networks

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Using Cellular Sensor Networks for Environment Protection

Using Cellular Sensor Networks for Environment Protection

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

ISBN: (纸本)9781479917761

Protecting the environment from many threats has become a priority worldwide. The existing sensor technology enables the continuous monitoring of various parameters related to environment status, such as air quality and many others. In this paper we propose a secure architecture based on cellular networks to collect such sensors' information in real time. The cell phones can interact with the cellular network and the sensor networks at the same time. This unique ability can be leveraged to provide better authentication and security. We propose an architecture for these networks along with protocols that can be used to establish security. In our architecture, we use gateways, as intermediate nodes that are able to interact with both the cell phones and the sensor nodes.

关键词： Cellular phones Logic gates Cryptography Authentication computer architecture Servers

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Energy Models for Communication of Future Computing Platforms

Energy Models for Communication of Future Computing Platform...

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IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Elke Franz Stefan Pfennig Bho Matthiesen Christian Scheunert Eduard A. Jorswieck Dep. of Computer Science/Privacy and Data Security Dep. of Electrical Engineering and Information Technology/Communications Laboratory Technische Universität Dresden Dresden Germany

ISBN: (纸本)9781467365567

Energy efficiency is an essential requirement on future computer architectures. Thereby, the efficiency of the communication will play an important role. Within this paper, we present an energy model for a unicast multi-hop communication. The model allows to derive predictions about the energy of a future computing platform. Further, it can be used to identify which components of the system or tasks related to communication have a significant influence on the overall energy and, hence, require special attention in the design phase. We discuss how values for processing delays and power consumption can be determined for a future computing platform and present values for a target platform. The energy model is applied to derive energy predictions for this platform.

关键词： Delays Computational modeling Power demand Network coding Open systems Hardware Receivers

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Strategies of SIMD Computing for Image Coding in GPU

Strategies of SIMD Computing for Image Coding in GPU

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International Conference on High Performance Computing

作者： Pablo Enfedaque Francesc Auli-Llinas Juan C. Moure Dep. of Information and Communications Engineering Universitat Autònoma de Barcelona Bellaterra Spain Dep. of Computer Architecture and Operating Systems Universitat Autònoma de Barcelona Bellaterra Spain

ISBN: (纸本)9781467384872

The main difficulty to implement modern image coding systems in a GPU is that the algorithms employed in the core of the coding scheme are inherently sequential. We recently proposed bitplane image coding with parallel coefficient processing (BPC-PaCo), a coding scheme that, contrarily to most systems, permits the processing of multiple coefficients of the image in parallel. This enables the use of SIMD computing, ideal for its implementation in a GPU. This paper introduces and evaluates the GPU implementation of BPC-PaCo employing two different strategies that tradeoff computational throughput and compression efficiency. The proposed implementation is compared to the best CPU and GPU implementations of JPEG2000, the state-of-the-art image compression standard. Experimental results indicate that BPC-PaCo achieves a computational throughput that is an order of magnitude superior to that achieved with such implementations with a small reduction in coding efficiency.

关键词： Image coding Encoding Graphics processing units Parallel processing Transform coding Context Instruction sets

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Experimental Evaluation of BMX6 Routing Metrics in a 802.11an Wireless-Community Mesh Network

Experimental Evaluation of BMX6 Routing Metrics in a 802.11a...

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International Conference on Future Internet of Things and Cloud (FiCloud)

作者： Llorenç Cerdà-Alabern Axel Neumann Leonardo Maccari Computer Architecture Dep. Univ. Politècnica de Catalunya Barcelona Spain DISI University of Trento Trento Italy

Modeling the performance of Wireless Mesh Networks (WMN) is a task that has received a lot of attention and has produced a large body of related literature. Most of the times, such literature is based on analytic assumptions or computer simulations, and results not always match reality. In this paper we use data collected over a one-month period in a 50-nodes wireless community network in Barcelona to compare the experimental throughput we measured over multi-hop paths with the capacity estimated using the well known conflict graph model. Our experiments show that the model generally overestimates the available capacity, despite the availability of precise information on the underlying network graph. We also use the data to test the performance of the BMX6 routing protocol that runs on the network nodes and show that in the large majority of cases the path chosen by BMX6 corresponds to the path with the highest available capacity, which is a key feature to guarantee the maximum exploitation of the network resources.

关键词： Measurement Routing Routing protocols Wireless communication Interference Logic gates

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