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IDMA-Based Compressed Sensing for Ocean Monitoring Information Acquisition with Sensor Networks

MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-13页

作者： Liu, Gongliang Kang, Wenjing Harbin Inst Technol Sch Informat & Elect Engn Weihai 264209 Peoples R China

The ocean monitoring sensor network is a typically energy-limited and bandwidth-limited system, and the technical bottleneck of which is the asymmetry between the demand for large-scale and high-resolution information acquisition and the limited network resources. The newly arising compressed sensing theory provides a chance for breaking through the bottleneck. In view of this and considering the potential advantages of the emerging interleave-division multiple access (IDMA) technology in underwater channels, this paper proposes an IDMA-based compressed sensing scheme in underwater sensor networks with applications to environmental monitoring information acquisition. Exploiting the sparse property of the monitored objects, only a subset of sensors is required to measure and transmit the measurements to the monitoring center for accurate information reconstruction, reducing the requirements for channel bandwidth and energy consumption significantly. Furthermore, with the aid of the semianalytical technique of IDMA, the optimal sensing probability of each sensor is determined to minimize the reconstruction error of the information map. Simulation results with real oceanic monitoring data validate the efficiency of the proposed scheme.

关键词： MULTIPLE access protocols (Computer network protocols) coding theory BANDWIDTHS COMPRESSED sensing (Signal processing) BOTTLENECKS (Manufacturing)

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Production and Performance of JEFF3.1.2 Nuclear Data Library in ANSWERS Codes

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NUCLEAR DATA SHEETS 2014年第1期118卷 463-465页

作者： Perry, R. J. AMEC Dorchester DT2 8ZB Dorset England

The latest version of the JEFF library, JEFF-3.1.2, was released in January 2012. This incorporated new evaluations of the hafnium resolved resonance range and the inclusion of gamma production data for 89 fission products (representing 99% of fission product absorption). These data have been processed into a continuous (point) energy nuclear data library for the ANSWERS Monte Carlo code MONK and a multi-group library for the deterministic neutronics code, WIMS. These applications nuclear data libraries have been produced using a combination of the NJOY nuclear data processing code and bespoke processing codes. A summary of the results for the MONK library for a wide range of criticality benchmarks is presented.

关键词： NUCLEAR research HAFNIUM ELECTRONIC data processing DATA libraries coding theory NEUTRONS

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Code assessment and modelling for Design Basis Accident Analysis of the European sodium fast reactor design. Part I: System description, modelling and benchmarking

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NUCLEAR ENGINEERING AND DESIGN 2014年 266卷 1-16页

作者： Lazaro, A. Ammirabile, L. Bandini, G. Darmet, G. Massara, S. Dufour, Ph Tosello, A. Gallego, E. Jimenez, G. Mikityuk, K. Schikorr, M. Bubelis, E. Ponomarev, A. Kruessmann, R. Stempniewicz, M. JRC IET European Commiss NL-1755 ZG Petten Netherlands ENEA I-40129 Bologna Italy EDF F-92141 Clamart France CEA F-13108 St Paul Les Durance Cadarache France UPM Madrid 228006 Spain Paul Scherrer Inst CH-5232 Villigen Switzerland KIT Inst Neutron Phys & Reactor Technol D-76344 Eggenstein Leopoldshafen Germany NRG NL-6800 ES Arnhem Netherlands Univ Politecn Valencia Valencia 46002 Spain

The new reactor concepts proposed in the Generation IV International Forum (GIF) are conceived to improve the use of natural resources, reduce the amount of high-level radioactive waste and excel in their reliability and safe operation. Among these novel designs sodium fast reactors (SFRs) stand out due to their technological feasibility as demonstrated in several countries during the last decades. As part of the contribution of EURATOM to GIF the CP-ESFR is a collaborative project with the objective, among others, to perform extensive analysis on safety issues involving renewed SFR demonstrator designs. The verification of computational tools able to simulate the plant behaviour under postulated accidental conditions by code-to-code comparison was identified as a key point to ensure reactor safety. In this line, several organizations employed coupled neutronic and thermal-hydraulic system codes able to simulate complex and specific phenomena involving multi-physics studies adapted to this particular fast reactor technology. In the "Introduction" of this paper the framework of this study is discussed, the second section describes the envisaged plant design and the commonly agreed upon modelling guidelines. The third section presents a comparative analysis of the calculations performed by each organisation applying their models and codes to a common agreed transient with the objective to harmonize the models as well as validating the implementation of all relevant physical phenomena in the different system codes. (C) 2013 Elsevier B.V. All rights reserved.

关键词： FAST reactors ACCIDENTS FAST reactors -- Design & construction SODIUM NUMERICAL calculations coding theory THERMAL hydraulics

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Redundant robust topology optimization of truss

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OPTIMIZATION AND ENGINEERING 2014年第4期15卷 945-972页

作者： Mohr, Daniel P. Stein, Ina Matzies, Thomas Knapek, Christina A. Max Planck Inst Extraterr Phys D-85741 Garching Germany Univ Bundeswehr Munchen Inst Math & Comp Applicat Dept Aerosp Engn D-85577 Neubiberg Germany Univ Bundeswehr Munchen Inst Lightweight Struct Dept Aerosp Engn D-85577 Neubiberg Germany

A common problem in the optimization of structures is the handling of uncertainties in the parameters. If the parameters appear in the constraints, the uncertainties can lead to an infinite number of constraints. Usually the constraints have to be approximated by finite expressions to generate a computable problem. Here, using the example of topology optimization of a truss, a method is proposed to deal with such uncertainties by utilizing robust optimization techniques. This leads to an approach without the necessity of any approximation. Another common problem in the optimization of structures is the consideration of possible damages. The typical approach is to prevent these damages by a convenient structure-this concept is known as safe-life. The method developed here applies the principle of redundancy to resist damages, which is the design philosophy of fail-safe. In general this leads to a high dimensional partitioning problem. By using a linear ansatz we get a computable problem. Finally, robust and redundant methods are combined, and simple numerical examples of typical problems illustrate the application of the methods. Our new redundant robust topology optimization of truss, based on known concepts of different research fields, gives a structure which is not only "safe" for parameter perturbations but for failure of bars, too. This introduces the fail-safe concept to structural optimization.

关键词： Structural optimization Robustness Redundancy Robust optimization Uncertainty Truss topology optimization Sizing optimization Ground structure coding theory Redundant Fail-safe

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Verification of spectral burn-up codes on 2D fuel assemblies of the GFR demonstrator ALLEGRO reactor

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NUCLEAR ENGINEERING AND DESIGN 2014年 267卷 148-153页

作者： Cerba, Stefan Vrban, Branislav Lueley, Jakub Darilek, Petr Zajac, Radoslav Necas, Vladimir Hascik, Jan Slovak Univ Technol Bratislava Fac Elect Engn & Informat Technol Inst Nucl & Phys Engn Bratislava 81219 Slovakia VUJE As Trnava 91864 Slovakia

The gas-cooled fast reactor, which is one of the six GEN IV reactor concepts, is characterized by high operational temperatures and a hard neutron spectrum. The utilization of commonly used spectral codes, developed mainly for LWR reactors operated in the thermal/epithermal neutron spectrum, may be connected with systematic deviations since the main development effort of these codes has been focused on the thermal part of the neutron spectrum. To be able to carry out proper calculations for fast systems the used codes have to account for neutron resonances including the self-shielding effect. The presented study aims at verifying the spectral HELIOS, MCNPX and SCALE codes on the basis of depletion calculations of 2D MOX and ceramic fuel assemblies of the ALLEGRO gas-cooled fast reactor demonstrator in infinite lattice. (C) 2013 Elsevier B.V. All rights reserved.

关键词： BURNUP (Nuclear chemistry) coding theory NUCLEAR fuels NUCLEAR reactors SOLID oxide fuel cells GAS cooled reactors FAST reactors

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ISOMORPHISM BETWEEN LINEAR CODES AND ARITHMETIC CODES FOR SAFE DATA PROCESSING IN EMBEDDED SOFTWARE SYSTEMS

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COMPUTING AND INFORMATICS 2014年第4期33卷 721-734页

作者： Raab, Peter Kraemer, Stefan Mottok, Juergen Vavricka, Vlastimil Regensburg Univ Appl Sci Fac Elect & Informat Technol Lab Safe & Secure Syst D-93053 Regensburg Germany Univ W Bohemia Fac Sci Appl Plzen 30614 Czech Republic

We present a transformation rule to convert linear codes into arithmetic codes. Linear codes are usually used for error detection and correction in broadcast and storage systems. In contrast, arithmetic codes are very suitable for protection of software processing in computer systems. This paper shows how to transform linear codes protecting the data stored in a computer system into arithmetic codes safeguarding the operations built on this data. Combination of the advantages of both coding mechanisms will increase the error detection capability in safety critical applications for embedded systems by detection and correction of arbitrary hardware faults.

关键词： coding theory linear codes arithmetic codes code transformation residue error probability Safely Embedded Software (SES)

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An effective approach to offline Arabic handwriting recognition

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COMPUTERS & ELECTRICAL ENGINEERING 2014年第6期40卷 1883-1901页

作者： Al Abodi, Jafaar Li, Xue Univ Queensland Brisbane Qld 4072 Australia Univ Queensland Sch Informat Technol & Elect Engn Brisbane Qld 4072 Australia

Segmentation is the most challenging part of Arabic handwriting recognition due to the unique characteristics of Arabic writing that allow the same shape to denote different characters. An Arabic handwriting recognition system cannot be successful without using an appropriate segmentation method. In this paper, a very effective and efficient off-line Arabic handwriting recognition approach is proposed. The proposed approach has three stages. Firstly, all characters are simplified to single-pixel-thin images that preserve the fundamental writing characteristics. Secondly, the image pixels are normalized into horizontal and vertical lines only. Therefore, the different writing styles can be unified and the shapes of characters are standardized. Finally, these orthogonal lines are coded as unique vectors;each vector represents one letter of a word. To evaluate the proposed techniques, we have tested our approach on two different datasets. Our experimental results show that the proposed approach has superior performance over the state-of-the-art approaches. (C) 2014 Published by Elsevier Ltd.

关键词： ARABIC language -- Writing HANDWRITING recognition (Computer science) SEGMENTATION (Image processing) PIXELS PERFORMANCE evaluation coding theory

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ISP-Friendly Data Scheduling by Advanced Locality-Aware Network coding for P2P Distribution Cloud

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MATHEMATICAL PROBLEMS IN ENGINEERING 2014年第1期2014卷 1-11页

作者： Li, Yanjun Zhang, Guoqing Zhang, Guoqiang Chinese Acad Sci Inst Comp Technol Beijing 100190 Peoples R China Nanjing Normal Univ Sch Comp Sci & Technol Nanjing 210023 Jiangsu Peoples R China

Peer-to-peer (P2P) file distribution imposes increasingly heavy traffic burden on the Internet service providers (ISPs). The vast volume of traffic pushes up ISPs' costs in routing and investment and degrades their networks performance. Building ISP-friendly P2P is therefore of critical importance for ISPs and P2P services. So far most efforts in this area focused on improving the locality-awareness of P2P applications, for example, to construct overlay networks with better knowledge of the underlying network topology. There is, however, growing recognition that data scheduling algorithms also play an effective role in P2P traffic reduction. In this paper, we introduce the advanced locality-aware network coding (ALANC) for P2P file distribution. This data scheduling algorithm completely avoids the transmission of linearly dependent data blocks, which is a notable problem of previous network coding algorithms. Our simulation results show that, in comparison to other algorithms, ALANC not only significantly reduces interdomain P2P traffic, but also remarkably improves both the application-level performance (for P2P services) and the network-level performance (for ISP networks). For example, ALANC is 30% faster in distributing data blocks and it reduces the average traffic load on the underlying links by 40%. We show that ALANC holds the above gains when the tit-for-tat incentive mechanism is introduced or the overlay topology changes dynamically.

关键词： PEER-to-peer architecture (Computer networks) INTERNET service providers COMPUTER scheduling coding theory COMPUTER algorithms

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Extension and application of the reactor dynamics code DYN3D for Block-type High Temperature Reactors

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NUCLEAR ENGINEERING AND DESIGN 2014年 271卷 431-436页

作者： Baier, Silvio Fridman, Emil Kliem, Soeren Rohde, Ulrich Helmholtz Zentrum Dresden Rossendorf D-01314 Dresden Germany

The reactor code DYN3D was developed at the Helmholtz-Zentrum Dresden-Rossendorf to study steady state and transient behavior of Light Water Reactors. Concerning the neutronics part, the multigroup diffusion or SP3 transport equation based on nodal expansion methods is solved both for hexagonal and square fuel element geometry. To deal with Block-type High Temperature Reactor cores DYN3D was extended to a version DYN3D-HTR. A 3D heat conduction model was introduced to include 3D effects of heat transfer and heat conduction and the detailed structure of the fuel element. Homogenized neutronic cross sections were generated by applying a Monte Carlo approach with resolution of each individual TRISO fuel particle. Results of coupled steady state and transient calculations with 12 energy groups are presented. Transient case studies are control rod insertion, a change of the inlet coolant temperature and a change of the coolant gas mass flow rate. It is shown that DYN3D-HTR is an appropriate code system to simulate steady states and short time transients. Furthermore the necessity of the 3D heat conduction model is demonstrated. (C) 2013 Elsevier B.V. All rights reserved.

关键词： NUCLEAR reactors coding theory HIGH temperature physics LIGHT water reactors TRANSPORT theory (Mathematics) NEUTRONS

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CONRAD Evaluation Code: Development Status and Perspectives

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NUCLEAR DATA SHEETS 2014年第1期118卷 488-490页

作者： Archier, P. De Saint Jean, C. Litaize, O. Noguere, G. Berge, L. Privas, E. Tamagno, P. CEA DEN DER SPRCLEPh F-13108 St Paul Les Durance France

CONRAD is an object-oriented code developed at CEA Cadarache since 2005 to treat issues occurring during the data assimilation process. The last new features of the code in terms of experimental, theoretical and interface aspects are presented in this paper. The experimental descriptions capabilities have been enhanced thanks to the implementation of both analytical (Chi-Square, Gaussian) and Monte-Carlo resolution functions which are required for neutron resonance shape analysis. On the theoretical aspects, efforts have been focused on the fast energy region with the wrapping of the ECIS and TALYS codes and the management of optical model and statistical parameters. These new features make it possible for CONRAD to currently perform evaluations from 0 to 20 MeV. Concerning the interfacing developments, a multigroup cross-sections generating tool and an ENDF parser have been recently improved to produce multigroup cross-section covariance matrices in the frame of the JEFF project. Several examples and comparisons with other codes (SAMMY, REFIT) are provided to validate each development.

关键词： coding theory DATA analysis NUCLEAR physics -- Experiments MONTE Carlo method NEUTRON resonance CROSS sections (Nuclear physics)

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