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6th ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness, ISA 2014

作者： Russo, Davide Zlatanova, Sisi Clementini, Eliseo Department of Information Engineering Computer Science and Mathematics University of L'Aquila Via Vetoio Coppito L'Aquila67100 Italy Department OTB Architecture and Built Environment Delft University of Technology GIS Technology Julianalaan 134 Delft2628 BL Netherlands Department of Industrial and Information Eng. and Economics University of L'Aquila Via G. Gronchi 18 L'Aquila67100 Italy

ISBN: (纸本)9781450331371

The aim of this research is to investigate how to communicate route directions for wayfinding assistance in indoor environments including visible landmarks along the route. We propose an algorithm to automatically generate low level directions, as an XML file, that can be later translated in other languages, e.g., IndoorGML. The most suitable data model is a graph with openings (doors, windows, passages), features and concave corners as nodes, and edges based on geometrical visibility between them. For a given route, the proposed algorithm extracts all the surrounding visible nodes and groups them to simplify subsequent textual instructions. This process is then implemented in a software prototype, "IndoorNav", based on an Android device. It uses QRcode scanning for locating user position, calculates the best route to follow, generates low-level route directions, and translates them into textual instructions in the requested language;finally, it shows them to users. Copyright 2014 ACM.

关键词： Software prototyping

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Dynamic and Adaptive Calling Context Encoding 14

Dynamic and Adaptive Calling Context Encoding

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Proceedings of Annual IEEE/ACM International Symposium on Code Generation and Optimization

作者： Jianjun Li Zhenjiang Wang Chenggang Wu Wei-Chung Hsu Di Xu State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Department of Computer Science National Taiwan University Taipei Taiwan IBM Research - China Beijing China

ISBN: (纸本)9781450326704

Calling context has been widely used in many software development processes such as testing, event logging, and program analysis. It plays an even more important role in data race detection and performance bottleneck analysis for multi-threaded programs. This paper presents DACCE (Dynamic and Adaptive Calling Context Encoding), an efficient runtime encoding/decoding mechanism for single-threaded and multi-threaded programs that captures dynamic calling contexts. It can dynamically encode all call paths invoked at runtime, and adjust the encodings according to program's execution behavior. In contrast to existing context encoding method, DACCE can work on incomplete call graph, and it does not require source code analysis and offline profiling to conduct context encoding. DACCE has significantly expanded the functionality and applicability of calling context with even lower runtime overhead. DACCE is very efficient based on experiments with SPEC CPU2006 and Parsec 2.1 (with about 2% of runtime overhead) and effective for all tested benchmarks.

关键词： dynamic analysis calling context encoding adaptive

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Physically based parallel ray tracer for the Metropolis light transport algorithm on the Tianhe-2 supercomputer

Physically based parallel ray tracer for the Metropolis ligh...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Changmao Wu Yunquan Zhang Congli Yang Yutong Lu University of Chinese Academy of Sciences Beijing China State Key Laboratory of Computer Architecture CAS Beijing China Laboratory of Parallel Software & Computational Science CAS Beijing China Department of Computer Science & Technology National University of Defense Technology Changsha Hunan China

Developing an efficient and highly scalable ray tracer for the Metropolis light transport algorithm is becoming increasingly important as the request for photorealistic images becomes a common trend. Although the Metropolis light transport algorithm has produced some of the most realistic images to date, it usually takes a great amount of time to render an image. The development of an efficient and highly scalable ray tracer for the Metropolis light transport algorithm is hard due in large part to the irregular memory access patterns, the imbalanced workload of light-carrying paths and the complicated mathematical model and complex physical processes. In this paper, we present a highly scalable physically based parallel ray tracer for the Metropolis light transport algorithm. Firstly, we present the idea of snapshot and sub-snapshot, then propose a novel assignment partitioning algorithm for compute nodes and CPU cores since the demand-driven assignment partitioning algorithms don't work. Secondly, we propose a physically based parallel ray racing framework for the Metropolis light transport algorithm, which is based on a master-worker architecture. Finally, we discuss the issue of granularity of the assignment partitioning and some optimization strategies for improving overall performance, then a hybrid scheduling strategy combining a static and dynamic scheduling strategy is described. Experiments show that our physically based ray tracer almost reaches linear speedup by using 26,400 CPU cores on the Tianhe-2 supercomputer. Our ray tracer is more efficient and highly scalable.

关键词： Partitioning algorithms EMTP

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All-flavor search for a diffuse flux of cosmic neutrinos with 9 years of ANTARES data

arXiv

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arXiv 2017年

作者： Albert, A. André, M. Anghinolfi, M. Anton, G. Ardid, M. Aubert, J.-J. Aublin, J. Avgitas, T. Baret, B. Barrios-Martí, J. Basa, S. Belhorma, B. Bertin, V. Biagi, S. Bormuth, R. Bourret, S. Bouwhuis, M.C. Brânzaş, H. Bruijn, R. Brunner, J. Busto, J. Capone, A. Caramete, L. Carr, J. Celli, S. El Moursli, R. Cherkaoui Chiarusi, T. Circella, M. Coelho, J.A.B. Coleiro, A. Coniglione, R. Costantini, H. Coyle, P. Creusot, A. Díaz, A.F. Deschamps, A. de Bonis, G. Distefano, C. Di Palma, I. Domi, A. Donzaud, C. Dornic, D. Drouhin, D. Eberl, T. El Bojaddaini, I. El Khayati, N. Elsässer, D. Enzenhöfer, A. Ettahiri, A. Fassi, F. Felis, I. Fusco, L.A. Gay, P. Giordano, V. Glotin, H. Grégoire, T. Ruiz, R. Gracia Graf, K. Hallmann, S. van Haren, H. Heijboer, A.J. Hello, Y. Hernández-Rey, J.J. Hößl, J. Hofestädt, J. Illuminati, G. James, C.W. de Jong, M. Jongen, M. Kadler, M. Kalekin, O. Katz, U. Kießling, D. Kouchner, A. Kreter, M. Kreykenbohm, I. Kulikovskiy, V. Lachaud, C. Lahmann, R. Lefèvre, D. Leonora, E. Lotze, M. Loucatos, S. Marcelin, M. Margiotta, A. Marinelli, A. Martínez-Mora, J.A. Mele, R. Melis, K. Michael, T. Migliozzi, P. Moussa, A. Navas, S. Nezri, E. Organokov, M. Alaş, G.E. Pav Pellegrino, C. Perrina, C. Piattelli, P. Popa, V. Pradier, T. Quinn, L. Racca, C. Riccobene, G. Sánchez-Losa, A. Saldaña, M. Salvadori, I. Samtleben, D.F.E. Sanguineti, M. Sapienza, P. Schüssler, F. Sieger, C. Spurio, M. Stolarczyk, Th. Taiuti, M. Tayalati, Y. Trovato, A. Turpin, D. Tönnis, C. Vallage, B. van Elewyck, V. Versari, F. Vivolo, D. Vizzoca, A. Wilms, J. Zornoza, J.D. Zúñiga, J. GRPHE - Université de Haute Alsace - Institut universitaire de technologie de Colmar 34 rue du Grillenbreit BP Colmar50568 - 68008 France Technical University of Catalonia Laboratory of Applied Bioacoustics Rambla Exposició Vilanova i la Geltrú Barcelona08800 Spain INFN - Sezione di Genova Via Dodecaneso 33 Genova16146 Italy Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Str. 1 Erlangen91058 Germany Universitat Politècnica de València C/ Paranimf 1 Gandia46730 Spain Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France APC Univ Paris Diderot CNRS/IN2P3 CEA/Irfu Obs de Paris Sorbonne Paris Cité France c/ Catedrático José Beltrán 2 PaternaValenciaE-46980 Spain LAM - Laboratoire d’Astrophysique de Marseille Pôle de l’Étoile Site de Château-Gombert rue Frédéric Joliot-Curie 38 Marseille Cedex 1313388 France National Center for Energy Sciences and Nuclear Techniques B.P.1382 R. P. Rabat10001 Morocco Via S. Sofia 62 Catania95123 Italy Nikhef Science Park Amsterdam Netherlands Huygens-Kamerlingh Onnes Laboratorium Universiteit Leiden Netherlands Institute of Space Science Bucharest MagureleRO-077125 Romania Universiteit van Amsterdam Instituut voor Hoge-Energie Fysica Science Park 105 Amsterdam1098 XG Netherlands INFN - Sezione di Roma P.le Aldo Moro 2 Roma00185 Italy Dipartimento di Fisica dell’Università La Sapienza P.le Aldo Moro 2 Roma00185 Italy Gran Sasso Science Institute Viale Francesco Crispi 7 L’Aquila00167 Italy University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 R.P10000 INFN - Sezione di Bologna Viale Berti-Pichat 6/2 Bologna40127 Italy INFN - Sezione di Bari Via E. Orabona 4 Bari70126 Italy Department of Computer Architecture and Technology/CITIC University of Granada Granada18071 Spain Géoazur UCA CNRS IRD Observatoire de la Côte d’Azur Sophia Antipolis France Dipartimento di Fisica dell’Università Via Dodecaneso 33

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New constraints on all flavor Galactic diffuse neutrino emission with the ANTARES telescope

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Physical Review D 2017年第6期96卷 062001-062001页

作者： A. Albert M. André M. Anghinolfi G. Anton M. Ardid J.-J. Aubert T. Avgitas B. Baret J. Barrios-Martí S. Basa B. Belhorma V. Bertin S. Biagi R. Bormuth S. Bourret M. C. Bouwhuis R. Bruijn J. Brunner J. Busto A. Capone L. Caramete J. Carr S. Celli R. Cherkaoui El Moursli T. Chiarusi M. Circella J. A. B. Coelho A. Coleiro R. Coniglione H. Costantini P. Coyle A. Creusot A. F. Díaz A. Deschamps G. De Bonis C. Distefano I. Di Palma A. Domi C. Donzaud D. Dornic D. Drouhin T. Eberl I. El Bojaddaini N. El Khayati D. Elsässer A. Enzenhöfer A. Ettahiri F. Fassi I. Felis L. A. Fusco S. Galatà P. Gay V. Giordano H. Glotin T. Grégoire R. Gracia Ruiz K. Graf S. Hallmann H. van Haren A. J. Heijboer Y. Hello J. J. Hernández-Rey J. Hößl J. Hofestädt C. Hugon G. Illuminati C. W. James M. de Jong M. Jongen M. Kadler O. Kalekin U. Katz D. Kießling A. Kouchner M. Kreter I. Kreykenbohm V. Kulikovskiy C. Lachaud R. Lahmann D. Lefèvre E. Leonora M. Lotze S. Loucatos M. Marcelin A. Margiotta A. Marinelli J. A. Martínez-Mora R. Mele K. Melis T. Michael P. Migliozzi A. Moussa S. Navas E. Nezri M. Organokov G. E. Păvălaş C. Pellegrino C. Perrina P. Piattelli V. Popa T. Pradier L. Quinn C. Racca G. Riccobene A. Sánchez-Losa M. Saldaña I. Salvadori D. F. E. Samtleben M. Sanguineti P. Sapienza F. Schüssler C. Sieger M. Spurio Th. Stolarczyk M. Taiuti Y. Tayalati A. Trovato D. Turpin C. Tönnis B. Vallage V. Van Elewyck F. Versari D. Vivolo A. Vizzoca J. Wilms J. D. Zornoza J. Zúñiga D. Gaggero D. Grasso GRPHE—Université de Haute Alsace—Institut Universitaire de Technologie de Colmar 34 Rue du Grillenbreit BP 50568–68008 Colmar France Technical University of Catalonia Laboratory of Applied Bioacoustics Rambla Exposició 08800 Vilanova i la Geltrú Barcelona Spain INFN—Sezione di Genova Via Dodecaneso 33 16146 Genova Italy Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Straße 1 91058 Erlangen Germany Institut d’Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC)—Universitat Politècnica de València c/Paranimf 1 46730 Gandia Spain Aix Marseille Université CNRS/IN2P3 CPPM Marseille France APC Université Paris Diderot CNRS/IN2P3 CEA/IRFU Observatoire de Paris Sorbonne Paris Cité France IFIC—Instituto de Física Corpuscular (CSIC—Universitat de València) c/Catedrático José Beltrán 2 E-46980 Paterna Valencia Spain LAM—Laboratoire d’Astrophysique de Marseille Pôle de l’Étoile Site de Château-Gombert Rue Frédéric Joliot-Curie 38 13388 Marseille Cedex 13 France National Center for Energy Sciences and Nuclear Techniques B.P. 1382 R.P. 10001 Rabat Morocco INFN—Laboratori Nazionali del Sud (LNS) Via S. Sofia 62 95123 Catania Italy Nikhef Science Park Amsterdam Netherlands Huygens-Kamerlingh Onnes Laboratorium Universiteit Leiden Netherlands Universiteit van Amsterdam Instituut voor Hoge-Energie Fysica Science Park 105 1098 XG Amsterdam Netherlands INFN—Sezione di Roma P. le Aldo Moro 2 00185 Roma Italy Dipartimento di Fisica dell’Università La Sapienza P. le Aldo Moro 2 00185 Roma Italy Institute for Space Science RO-077125 Bucharest Măgurele Romania Gran Sasso Science Institute Viale Francesco Crispi 7 00167 L’Aquila Italy University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 R.P. 10000 Rabat Morocco INFN—Sezione di Bologna Viale Berti-Pichat 6/2 40127 Bologna Italy INFN—Sezione di Bari Via E. Orabona 4 70126 Bari Italy Department of Computer Architecture a

The flux of very high-energy neutrinos produced in our Galaxy by the interaction of accelerated cosmic rays with the interstellar medium is not yet determined. The characterization of this flux will shed light on Galactic accelerator features, gas distribution morphology and Galactic cosmic ray transport. The central Galactic plane can be the site of an enhanced neutrino production, thus leading to anisotropies in the extraterrestrial neutrino signal as measured by the IceCube Collaboration. The ANTARES neutrino telescope, located in the Mediterranean Sea, offers a favorable view of this part of the sky, thereby allowing for a contribution to the determination of this flux. The expected diffuse Galactic neutrino emission can be obtained, linking a model of generation and propagation of cosmic rays with the morphology of the gas distribution in the Milky Way. In this paper, the so-called “gamma model” introduced recently to explain the high-energy gamma-ray diffuse Galactic emission is assumed as reference. The neutrino flux predicted by the “gamma model” depends on the assumed primary cosmic ray spectrum cutoff. Considering a radially dependent diffusion coefficient, this proposed scenario is able to account for the local cosmic ray measurements, as well as for the Galactic gamma-ray observations. Nine years of ANTARES data are used in this work to search for a possible Galactic contribution according to this scenario. All flavor neutrino interactions are considered. No excess of events is observed, and an upper limit is set on the neutrino flux of 1.1 (1.2) times the prediction of the “gamma model,” assuming the primary cosmic ray spectrum cutoff at 5 (50) PeV. This limit excludes the diffuse Galactic neutrino emission as the major cause of the “spectral anomaly” between the two hemispheres measured by IceCube.

关键词： Cosmic ray propagation Extrasolar neutrino astronomy Neutrino detectors

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New constraints on all flavour galactic diffuse neutrino emission with the ANTARES telescope.

arXiv

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arXiv 2017年

作者： Albert, A. André, M. Anghinolfi, M. Anton, G. Ardid, M. Aubert, J.-J. Avgitas, T. Baret, B. Barrios-Martí, J. Basa, S. Belhorma, B. Bertin, V. Biagi, S. Bormuth, R. Bourret, S. Bouwhuis, M.C. Bruijn, R. Brunner, J. Busto, J. Capone, A. Caramete, L. Carr, J. Celli, S. El Moursli, R. Cherkaoui Chiarusi, T. Circella, M. Coelho, J.A.B. Coleiro, A. Coniglione, R. Costantini, H. Coyle, P. Creusot, A. Díaz, A.F. Deschamps, A. de Bonis, G. Distefano, C. Di Palma, I. Domi, A. Donzaud, C. Dornic, D. Drouhin, D. Eberl, T. El Bojaddaini, I. El Khayati, N. Elsässer, D. Enzenhöfer, A. Ettahiri, A. Fassi, F. Felis, I. Fusco, L.A. Galatà, S. Gay, P. Giordano, V. Glotin, H. Grégoire, T. Ruiz, R. Gracia Graf, K. Hallmann, S. van Haren, H. Heijboer, A.J. Hello, Y. Hernández-Rey, J.J. Hößl, J. Hofestädt, J. Hugon, C. Illuminati, G. James, C.W. de Jong, M. Jongen, M. Kadler, M. Kalekin, O. Katz, U. Kießling, D. Kouchner, A. Kreter, M. Kreykenbohm, I. Kulikovskiy, V. Lachaud, C. Lahmann, R. Lefèvre, D. Leonora, E. Lotze, M. Loucatos, S. Marcelin, M. Margiotta, A. Marinelli, A. Martínez-Mora, J.A. Mele, R. Melis, K. Michael, T. Migliozzi, P. Moussa, A. Navas, S. Nezri, E. Organokov, M. Păvălaş, G.E. Pellegrino, C. Perrina, C. Piattelli, P. Popa, V. Pradier, T. Quinn, L. Racca, C. Riccobene, G. Sánchez-Losa, A. Saldaña, M. Salvadori, I. Samtleben, D.F.E. Sanguineti, M. Sapienza, P. Schüssler, F. Sieger, C. Spurio, M. Stolarczyk, T.H. Taiuti, M. Tayalati, Y. Trovato, A. Turpin, D. Tönnis, C. Vallage, B. van Elewyck, V. Versari, F. Vivolo, D. Vizzoca, A. Wilms, J. Zornoza, J.D. Zúñiga, J. Gaggero, D. Grasso, D. GRPHE Université de Haute Alsace Institut universitaire de technologie de Colmar 34 rue du Grillenbreit BP 50568 Colmar68008 France Technical University of Catalonia Laboratory of Applied Bioacoustics Rambla Exposició Vilanova i la Geltrú Barcelona08800 Spain INFN - Sezione di Genova Via Dodecaneso 33 Genova16146 Italy Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Str. 1 Erlangen91058 Germany Universitat Politècnica de València C/ Paranimf 1 Gandia46730 Spain Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France APC Univ Paris Diderot CNRS/IN2P3 CEA/Irfu Obs de Paris Sorbonne Paris Cité France c/ Catedrático José Beltrán 2 PaternaValenciaE-46980 Spain LAM - Laboratoire d’Astrophysique de Marseille Pôle de l’Étoile Site de Château-Gombert rue Frédéric Joliot-Curie 38 Marseille Cedex 1313388 France National Center for Energy Sciences and Nuclear Techniques B.P.1382 R. P. Rabat10001 Morocco Via S. Sofia 62 Catania95123 Italy Nikhef Science Park Amsterdam Netherlands Huygens-Kamerlingh Onnes Laboratorium Universiteit Leiden Netherlands Universiteit van Amsterdam Instituut voor Hoge-Energie Fysica Science Park 105 Amsterdam1098 XG Netherlands INFN - Sezione di Roma P.le Aldo Moro 2 Roma00185 Italy Dipartimento di Fisica dell’Università La Sapienza P.le Aldo Moro 2 Roma00185 Italy Institute for Space Science Bucharest MăgureleRO-077125 Romania Gran Sasso Science Institute Viale Francesco Crispi 7 L’Aquila00167 Italy University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 R.P Rabat10000 Morocco INFN - Sezione di Bologna Viale Berti-Pichat 6/2 Bologna40127 Italy INFN - Sezione di Bari Via E. Orabona 4 Bari70126 Italy Department of Computer Architecture and Technology/CITIC University of Granada Granada18071 Spain Géoazur UCA CNRS IRD Observatoire de la Côte d’Azur Sophia Antipolis France Dipartimento di Fisica dell’Università Via D

The flux of very high-energy neutrinos produced in our Galaxy by the interaction of accelerated cosmic rays with the interstellar medium is not yet determined. The characterization of this flux will shed light on Galactic accelerator features, gas distribution morphology and Galactic cosmic ray transport. The central Galactic plane can be the site of an enhanced neutrino production, thus leading to anisotropies in the extraterrestrial neutrino signal as measured by the IceCube Collaboration. The ANTARES neutrino telescope, located in the Mediterranean Sea, offers a favourable view on this part of the sky, thereby allowing for a contribution to the determination of this flux. The expected diffuse Galactic neutrino emission can be obtained linking a model of generation and propagation of cosmic rays with the morphology of the gas distribution in the Milky Way. In this paper, the so-called "Gamma model" introduced recently to explain the high-energy gamma ray diffuse Galactic emission, is assumed as reference. The neutrino flux predicted by the "Gamma model" depends of the assumed primary cosmic ray spectrum cut-off. Considering a radially-dependent diffusion coefficient, this proposed scenario is able to account for the local cosmic ray measurements, as well as for the Galactic gamma ray observations. Nine years of ANTARES data are used in this work to search for a possible Galactic contribution according to this scenario. All flavour neutrino interactions are considered. No excess of events is observed and an upper limit is set on the neutrino flux of 1.1 (1.2) times the prediction of the "Gamma model" assuming the primary cosmic ray spectrum cut-off at 5 (50) PeV. This limit excludes the diffuse Galactic neutrino emission as the major cause of the "spectral anomaly" between the two hemispheres measured by IceCube. Copyright © 2017, The Authors. All rights reserved.

关键词： Cosmic rays

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Face image abstraction by Ford-Fulkerson algorithm and invariant feature descriptor for human identification

Face image abstraction by Ford-Fulkerson algorithm and invar...

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International Carnahan Conference on Security technology

作者： Dakshina Ranjan Kisku Debanjan Chatterjee S. Trivedy Massimo Tistarelli Department of Computer Science and Engineering National Institute of Technology Durgapur India Department of Information Technology Asansol Engineering College Asansol India Dept. of Architecture University of Sassari Alghero (SS) Italy

This paper discusses a face image abstraction method by using SIFT features and Ford-Fulkerson algorithm. Ford-Fulkerson algorithm is used to compute the maximum flow in a flow network drawn on SIFT features extracted from a face image. The idea is to obtain an augmenting path which is a path from the source vertex to destination vertex with the available capacities on all edges along a set of paths and flow is calculated along one of these paths. The process is repeated until it is obtained more paths with the available capacities. At the initial stage, face image is characterized by SIFT (Scale Invariant Feature Transform) features and the keypoints descriptor information is taken as features set for further processing. Keypoints descriptor is used to generate several face representations by using a series of matrix operations which are further used to determine a Directed Acyclic Graph (DAG). The resultant directed graph contains sparse and distinctive face characteristics of a subject from which the face image is captured. We then apply the Ford-Fulkerson algorithm on the directed graph to maintain the capacity constraints, skew symmetry and flow conservation to obtain an augmenting path with available capacities (relation between SIFT points). Finally, we obtain a mathematical representation of a face image and this representation is further encoded to be used as a set of distinctive features for matching. The time complexity of the proposed face abstraction algorithm is found to be O(VE 2 ) where V is the set of vertices and E is the set of edges in a directed graph.

关键词： Face Feature extraction Face recognition Biometrics (access control) Lighting Cameras Image edge detection

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Construction Crew Productivity Prediction by Using Data Mining Methods

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Procedia - Social and Behavioral sciences 2014年 141卷 1249-1253页

作者： Mümine Kaya Abdullah Emre Keleş Emel Laptalı Oral Adana Science and Technology University Faculty of Engineering and Natural Sciences Department of Computer Engineering 01180 Adana Turkey Adana Science and Technology University Faculty of Engineering and Natural Sciences Department of Civil Engineering 01180 Adana Turkey Cukurova University Faculty of Engineering and Architecture Department of Civil Engineering 01330 Adana Turkey

Ceramic tiling industry has become one of Turkey's fastest growing industries due to the outstanding achievements of Turkish ceramic producers with respect to producing high quality products with lower costs than their equivalents worldwide. Conversely high costs of the end product of Turkish building industry in general show that there is an important problem with the productivity and quality of construction crews. That's why most construction firms begin to realize the need for a detailed research on the factors affecting construction crew productivity. The purpose of this study is thus to classify the factors that affect the productivity of ceramic tiling crews by using data mining methods. To achieve the purpose of our study, a systematic time study was undertaken with ceramic tiling crews in Turkey. Daily productivity values of ceramic tiling crews were collected together with the information related with the factors like the crew size, age and experience of crewmembers. Collected data was classified by using Weka program. The outlier values were first removed from the dataset and decision tree method was used to classify the new dataset. Decision tree method was preferred due to its easiness of use and rapidness in classification. Apriori algorithm, which is the mostly preferred association algorithm in previous studies, was also used to highlight the general trend in the dataset.

关键词： Classification Productivity Data Mining Construction Industry

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Reducing Compiler-Inserted Instrumentation in Unified-Parallel-C Code Generation

Reducing Compiler-Inserted Instrumentation in Unified-Parall...

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International Symposium on computer architecture and High Performance Computing (SBAC-PAD)

作者： Michail Alvanosl José Nelson Amaral Ettore Tiotto Montse Farreras Xavier Martorell Computer Science Barcelona Supercomputing Center Department of Computing Science University of Alberta Edmonton Canada Static Comnilation Technology IBM Toronto Laboratory Markham Canada Universitat Politecnica de Catalunya Barcelona Catalunya ES Department of Computer Architecture Universitat Politècnica Catalunya

Programs written in Partitioned Global Address Space (PGAS) languages can access any location of the entire address space via standard read/write operations. However, the compiler have to create the communication mechanisms and the runtime system to use synchronization primitives to ensure the correct execution of the programs. However, PGAS programs may have fine-grained shared accesses that lead to performance degradation. One solution is to use the inspector-executor technique to determine which accesses are indeed remote and which accesses may be coalesced in larger remote access operations. A straightforward implementation of the inspector-executor in a PGAS system may result in excessive instrumentation that hinders performance. This paper introduces a shared-data localization transformation based on linear memory descriptors (LMADs) that reduces the amount of instrumentation introduced by the compiler into programs written in the UPC language and describes a prototype implementation of the proposed transformation. A performance evaluation, using up to 2048 cores of a POWER 775 supercomputer, allows for a prediction that applications with regular accesses can achieve up to 180% of the performance of handoptimized versions while applications with irregular accesses yield performance gain from 1.12X up to 6.3X speedup.

关键词： Runtime Arrays Prefetching Benchmark testing Electronics packaging Marine animals Optimization

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A Game Theory Based Vertical Handoff Scheme for Wireless Heterogeneous Networks

A Game Theory Based Vertical Handoff Scheme for Wireless Het...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Shuai Fu Jie Li Ruidong Li Yusheng Ji Department of computer science University of Tsukuba Tsukuba Japan National Institute of Information and Communications Technology Tokyo Japan Information Systems Architecture National Institute of Informatics Tokyo Japan

ISBN: (纸本)9781479973958

Next-generation wireless networks integrate multiple wireless access technologies to provide seamless wireless connectivity for mobile nodes (MNs). When MNs move in wireless heterogeneous networks, they may suffer from the great degradation of received signal strength (RSS) and further quality of services (QoS), if randomly selecting an access point (AP). We address vertical handoff with game theory to enable MNs to trigger the handoff and select an appropriate network from multiple wireless access technologies. On the other hand, the existing vertical handoff schemes lack of jointly considering the behaviors of MNs and APs for approaching the reality. To solve this problem, we propose a repeated game based scheme for vertical handoff. Each sub-game is formulated as a non-cooperative strategic game between a MN and an AP in which the Nash equilibrium is the solution of each strategic game. The proposed repeated game is to optimize the utility functions of the whole network by finding an equilibrium point. We perform the performance analysis, which shows that proposed scheme can achieve better bandwidth utilization and throughput of the network compared to the AP random selection scheme.

关键词： Games Manganese Wireless communication Nash equilibrium Bandwidth Quality of service Ad hoc networks

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