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International Conference on Transparent Optical Networks

作者： K. Christodoulopoulos P. Kokkinos K. Manousakis E. A. Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patra Greece

ISBN: (纸本)9781424448258

In transparent wavelength routed optical networks, the signal quality degrades due to physical layer impairments. Certain physical effects make routing decisions made for one lightpath affect and be affected by the decisions for other lightpaths. To safely establish a lightpath for a new connection two main approaches can be used. The most common approach is to select a lightpath that has acceptable transmission quality under the worst case interference assumption. This ensures that the selected lightpath will not become infeasible due to the possible establishment of future interfering connections, but it sacrifices candidate path space for a quick and stable lightpath selection process. The second approach is to consider the actual current network utilization and account for the interference among lightpaths so as to perform a cross layer optimization between the network and physical layers. In the latter approach, the algorithm has to evaluate and check if the establishment of the new lightpath turns infeasible some of the already established connections. The question that arises is whether the performance benefits obtained through the second approach are worth the added complexity introduced by the cross-layer optimization required.

关键词： Cross layer design WDM networks Physical layer Interference computer networks Optical computing Physics computing Wavelength routing Optical fiber networks Degradation

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Security and Information Technologies with AI, Internet Computing and Big-data Applications 1

Security and Information Technologies with AI, Internet Comp...

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丛书名： Smart Innovation, Systems and Technologies

1000年

作者： George A. Tsihrintzis Shiuh-Jeng WANG Chih-Hung Wang

ISBN: (数字)9789819777860

ISBN: (纸本)9789819777853;9789819777884

The book presents selected papers from Second International Conference on Security and Information Technologies with AI, Internet Computing and Big-Data Applications (SITAIBA 2023), held at Chihlee University of Technology, New Taipei City during 7 – 9 December 2023. This book presents current research in information security, AI and deep learning applications, information processing, cyber-security and evidence investigations, and information hiding and cryptography.

关键词： Computational Intelligence Artificial Intelligence Cyber-physical systems, IoT Professional Computing Systems and Data Security

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Preface to the special issue of evolutionary computation and its applications

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2008年第3期128卷 333-333页

作者： Kawakami, Hiroshi Tsujimura, Yasuhiro Graduate School of Informatics Kyoto University Japan Department of Computer and Information Engineering Nippon Institute of Technology Japan

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Workflow - coordinated integration of enterprise/ industrial systems based on a semantic service - oriented architecture

Workflow - coordinated integration of enterprise/ industrial...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： C. Alexakos A.P. Kalogeras S. Likothanassis J. Gialelis S. Koubias Pattern Recognition Laboratory Department of Computer Engineering and Informatics University of Patras Rio Greece Industrial Systems Institute Science Park Platani Greece Pattern Recognition Laboratory Department of Computer Engineering and Informatics Engineering and Informatics University of Patras Rio Greece Research Academic Computer Technology Institute Patras Greece Applied Electronics Laboratory Department of Electrical and Computer Engineering University of Patras Rio Greece

Enterprise integration is significant for the enforcement of novel business models in an enterprise/industry. The great heterogeneity of systems/applications in the enterprise environment requires the introduction of interoperability aspects in order to resolve integration problems in a flexible and dynamic way. Our approach introduces an advanced enterprise semantic model representing both enterprise structure and available services, through the use of ontologies. The model is associated by a specific architecture that uses the above model in combination with state-of-the-art technologies such as Web services and workflows

关键词： Application software Ontologies Web services Semantic Web computer architecture Service oriented architecture Logic Internet Electronics industry Industrial electronics

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Advances in X3D multi-user virtual environments

Advances in X3D multi-user virtual environments

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IEEE International Symposium on Multimedia

作者： Ch. Bouras A. Panagopoulos Th. Tsiatsos Computer Engineering andaspx Informatics Department University of Patras Greece Technology Institute Research Academic Computer Greece

This paper presents the current state of the art in Web3d multi-user technologies and more specifically networked virtual environment platforms that support the X3D standard, which are currently limited in number, and also the existing X3D browsers that enable these applications. Furthermore, this paper presents the architecture of a platform, called EVE, which was developed to support multi-user virtual environments and was initially based on VRML, as well as the implementation regarding the process of upgrading this platform in order to fully support the X3D standard, using the open-source Xj3D library. Finally, the benefits of shifting to the X3D standard are presented, and some of the problems that currently exist are discussed.

关键词： Virtual environment Collaboration computer networks Application software informatics Standards development Internet Graphics Data visualization Open source software

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Real-Time and Intelligent Flood Forecasting Using UAV-Assisted Wireless Sensor Network

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computers, Materials & Continua 2022年第1期70卷 715-738页

作者： Shidrokh Goudarzi Seyed Ahmad Soleymani Mohammad Hossein Anisi Domenico Ciuonzo Nazri Kama Salwani Abdullah Mohammad Abdollahi Azgomi Zenon Chaczko Azri Azmi Centre for Artificial Intelligent(CAIT) Universiti Kebangsaan MalaysiaBangi43600Malaysia School of Computer Engineering Iran University of Science and TechnologyResalat Sq.16846-13114TehranIran School of Computing Faculty of Engineering Universiti Teknologi MalaysiaJohorMalaysia School of Computer Science and Electronic Engineering University of EssexColchester CO43SQUnited Kingdom Department of Electrical Engineering and Information Technologies University of Naples“Federico II”Naples80125Italy Razak Faculty of Technology and Informatics Universiti Teknologi MalaysiaKuala Lumpur54100Malaysia School of Electrical and Data Engineering University of Technology SydneyUltimoNSWAustralia

The Wireless Sensor Network(WSN)is a promising technology that could be used to monitor rivers’water levels for early warning flood detection in the 5G ***,during a flood,sensor nodes may be washed up or become faulty,which seriously affects network *** address this issue,Unmanned Aerial Vehicles(UAVs)could be integrated with WSN as routers or data mules to provide reliable data collection and flood *** light of this,we propose a fault-tolerant multi-level framework comprised of a WSN and a UAV to monitor river *** framework is capable to provide seamless data collection by handling the disconnections caused by the failed nodes during a ***,an algorithm hybridized with Group Method Data Handling(GMDH)and Particle Swarm Optimization(PSO)is proposed to predict forthcoming floods in an intelligent collaborative *** proposed water-level prediction model is trained based on the real dataset obtained fromthe Selangor River *** performance of the work in comparison with other models has been also evaluated and numerical results based on different metrics such as coefficient of determination(R2),correlation coefficient(R),RootMean Square Error(RMSE),Mean Absolute Percentage Error(MAPE),and BIAS are provided.

关键词： Unmanned aerial vehicles wireless sensor networks group method data handling particle swarm optimization river flow prediction

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Enhancing FEC application in LTE cellular networks

Enhancing FEC application in LTE cellular networks

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IFIP Wireless Days, WD

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Andreas Papazois Georgia Tseliou Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Greece

3 rd Generation Partnership Project's (3GPP) Long Term Evolution (LTE) is focused on enhancing the Universal Terrestrial Radio Access (UTRA). Evolved-Multimedia Broadcast and Multicast Service (e-MBMS) uses Multimedia Broadcast over a Single Frequency Network (MBSFN) operation in order to improve its performance. In MBSFN operation, data are transmitted simultaneously over the air from multiple tightly time-synchronized cells. Raptor codes have been standardized as the main application layer Forward Error Correction (FEC) method for e-MBMS due to the advanced error protection they offer and their overall performance. In this study, we investigate the application of FEC in MBSFN-enabled LTE cellular networks and we propose a new scheme that takes into account the properties of MBSFN in order to provide a more efficient operation of FEC during e-MBMS transmissions. The proposed scheme is compared with other file recovery methods and is evaluated against various network parameters in a realistic simulation environment.

关键词： Forward error correction Encoding Maintenance engineering Receivers Telecommunications OFDM Servers

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Spectroscopic monitoring of diesel fuels using Supervised Distance Preserving Projections

Spectroscopic monitoring of diesel fuels using Supervised Di...

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10th IFAC Symposium on Dynamics and Control of Process Systems, DYCOPS 2013

作者： Corona, Francesco Zhu, Zhanxing Souza Jr., Amauri H. Mulas, Michela Baratti, Roberto Department of Information and Computer Science Aalto University School of Science Espoo Finland Institute for Neural and Adaptive Computation School of Informatics University of Edinburgh Edinburgh United Kingdom Department of Teleinformatics Engineering Federal University of Ceará Fortaleza Brazil Department of Civil and Environmental Engineering Aalto University School of Engineering Espoo Finland Department of Mechanical Chemical and Material Engineering University of Cagliari Cagliari Italy

ISBN: (纸本)9783902823595

In this work, we discuss a recently proposed approach for supervised dimensionality reduction, the Supervised Distance Preserving Projection and, we investigate its applicability to monitoring material's properties from spectroscopic observations. Motivated by continuity preservation, the SDPP is a linear projection method where the local geometry of the points in the low-dimensional subspace mimics the geometry of the points in the response space. Such a mapping facilitates an efficient regressor design and it may also uncover useful information for visualisation. An experimental evaluation is conducted to show the performance of the SDPP and compare it with a number of state-of-the-art approaches for unsupervised and supervised dimensionality reduction. For the task, the results obtained on a benchmark problem consisting of a set of NIR spectra of diesel fuels and six different chemico-physical properties of those fuels is discussed. Based on the experimental results, the SDPP leads to accurate and parsimonious projections that can be used in the design of efficient regression models. © IFAC.

关键词： Principal component analysis

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Reliable multicasting over LTE: A performance study

Reliable multicasting over LTE: A performance study

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IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Konstantinos Asimakis Christos Bouras Vasileios Kokkinos Andreas Papazois Georgia Tseliou Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

With the booming of multimedia services, the 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Multicast/Broadcast Service (e-MBMS) feature for LTE systems. The main objective of MBMS is to introduce real broadcast distribution capabilities into cellular systems. This purposed 3GPP to introduce the MBMS over a Single Frequency Network (MBSFN) operation. In this work we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission schemes. We focus on the file repair procedure, because the distribution of binary data via MBMS must result in 100% error-free downloaded files. In order to achieve this goal, MBMS offers a Forward Error Correction (FEC) mechanism. Our simulation results show that there are some file repair schemes that achieve better performance as far as different network configurations are concerned. Furthermore, we compare all the file recovery methods and evaluate them against various network parameters in a realistic simulation environment.

关键词： Maintenance engineering Forward error correction Encoding Receivers Topology Servers

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Comparison of Routing and Wavelength Assignment Algorithms in WDM Networks

Comparison of Routing and Wavelength Assignment Algorithms i...

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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： K. Christodoulopoulos K. Manousakis E. Varvarigos Computer Engineering and Informatics Department Greece Research Academic Computer Technology Institute University of Patras Patras Greece

We design and implement various algorithms for solving the static RWA problem with the objective of minimizing the maximum number of requested wavelengths based on LP relaxation formulations. We present a link formulation, a path formulation and a heuristic that breaks the problem in the two constituent subproblems and solves them individually and sequentially. The flow cost functions that are used in these formulations result in providing integer optimal solutions despite the absence of integrality constraints for a large subset of RWA input instances, while also minimizing the total number of used wavelengths. We present a random perturbation technique that is shown to increase the number of instances for which we find integer solutions, and we also present appropriate iterative fixing and rounding methods to be used when the algorithms do not yield integer solutions. We comment on the number of variables and constraints these formulations require and perform extensive simulations to compare their performance to that of a typical min-max congestion formulation.

关键词： Wavelength routing Wavelength assignment WDM networks Telecommunication traffic Wavelength division multiplexing Optical fiber networks Optical fiber communication computer networks Algorithm design and analysis Cost function

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