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Revisiting the cube lifecycle in the presence of hierarchies

Konstantinos Morfonios, Yannis Ioannidis
2009 The VLDB journal  
This fact renders existing techniques essentially inapplicable in a significant number of real-world applications and mandates revisiting the entire cube lifecycle under the new perspective.  ...  Nevertheless, as shown in this paper, the nature of hierarchies introduces several complications into the entire lifecycle of a data cube including the operations of construction, storage, indexing, query  ...  a comprehensive ROLAP solution that deals with all aspects of the cube lifecycle for the first time in the presence of hierarchies.  ... 
doi:10.1007/s00778-009-0160-3 fatcat:adhjkcsvgreulflvhlxbyhj5ai

OUP accepted manuscript

2019 Monthly notices of the Royal Astronomical Society  
This isotropy may indicate that the line-of-sight extent of the cloud is approximately equivalent to that in the plane of the sky.  ...  'the Brick'); one of the most massive and dense molecular clouds in the Galaxy to lack signatures of widespread star formation.  ...  ACKNOWLEDGEMENTS We thank the referee for their careful reading of the manuscript and comments. We would like to thank Jill Rathborne for making the data product used in this paper available for use.  ... 
doi:10.1093/mnras/stz471 fatcat:mw6qepgvqfcmpp6yp574goguvy

Data Warehouse Testing

Matteo Golfarelli, Stefano Rizzi
2011 International Journal of Data Warehousing and Mining  
The objectives of this thesis study was to investigate the current state of the art in DW testing, to explore various DW testing tools and techniques and the challenges in DW testing and, to identify the  ...  found and a number of testing tools and techniques were found in the study.  ...  These tests measure the number of fact table counts in the star schema and the measure of the degree of conformity of dimensional hierarchies [28] .  ... 
doi:10.4018/jdwm.2011040102 fatcat:xhwpsnjufncrla4h5wvafm2uvq

Revisiting the Feasibility of Public Key Cryptography in Light of IIoT Communications

Jasone Astorga, Marc Barcelo, Aitor Urbieta, Eduardo Jacob
2022 Sensors  
However, the implementation of PKIs and certificate lifecycle management procedures in Industrial Internet of Things (IIoT) environments presents some challenges, mainly due to the high resource consumption  ...  This paper revisits all these alternatives in light of industrial communication models, identifying their strengths and weaknesses, and providing an in-depth comparative analysis.  ...  Then, this analysis is revisited in light of the industrial communication protocols and environments.  ... 
doi:10.3390/s22072561 pmid:35408176 pmcid:PMC9003447 fatcat:v2mtdi52vbcxjmv4isltqcpr6q

Loom: Complex large-scale visual insight for large hybrid IT infrastructure management

James Brook, Felix Cuadrado, Eric Deliot, Julio Guijarro, Rycharde Hawkes, Marco Lotz, Romaric Pascal, Suksant Sae-Lor, Luis M. Vaquero, Joan Varvenne, Lawrence Wilcock
2018 Future generations computer systems  
The value of the "Thread" visualisation model is shown in a qualitative analysis of users' experiences with Loom.  ...  In spite of their complexity, IT infrastructures have not benefited from the application of IVET techniques.  ...  if the pre-computed cubes are not what the user is asking for.  ... 
doi:10.1016/j.future.2017.08.013 fatcat:tvhhtikkw5htlhg62gnkdx6fsm

Spatial/temporal indexing and information visualization genre for environmental digital libraries

Chen Su-shing, Grunwald Sabine
2005 Journal of Zhejiang University: Science A  
System (ENVISAGE), currently in progress at the University of Florida.  ...  Protecting and preserving our environmental systems require the ability to understand the spatio-temporal distribution of soils, parent material, topography, and land cover as well as the effects of human  ...  This standard is structured in a hierarchy of data elements and compound elements.  ... 
doi:10.1631/jzus.2005.a1235 fatcat:5nkamtpmnnd25h7bj65kjbsw2i

From diffuse gas to dense molecular cloud cores [article]

Javier Ballesteros-Paredes, Philippe André, Patrck Hennebelle, Ralf S. Klessen, Shu-ichiro Inutsuka, J.M. Diederik Kruijssen, Mélanie Chevance, Fumitaka Nakamura, Angela Adamo, Enrique Vázquez-Semadeni
2020 arXiv   pre-print
In order to understand the dynamics of clouds we then give a critical review of the widely used virial theorem, and its relation to the measurable properties of molecular clouds.  ...  We first review the mechanisms of cloud formation from the warm diffuse interstellar medium down to the cold and dense molecular clouds, the process of molecule formation and the role of the thermal and  ...  For a more detailed discussion on this topic, we refer to Chevance et al. (2020b, this volume) Lifecycle of MCs Characterising the cloud lifecycle in galaxies is critical to understand the physical  ... 
arXiv:2006.01326v1 fatcat:nx2p47xniffvtip2ouz6viw7w4

Proceedings of the 19th International Overture Workshop [article]

Hugo Daniel Macedo, Casper Thule, Ken Pierce
2021 arXiv   pre-print
This event was the latest in a series of workshops around the Vienna Development Method (VDM), the open-source project Overture, and related tools and formalisms.  ...  A lively community of researchers and practitioners has grown up in academia and industry around the modelling languages (VDM-SL, VDM++, VDM-RT, CML) and tools (VDMTools, Overture, VDM VSCode extension  ...  This work is also supported by the Manufacturing Academy of Denmark (MADE) in the MADE FAST project (see http://www.made.dk/).  ... 
arXiv:2110.09371v1 fatcat:dxtd57uulvhalcbmvu7paruwdu

Data cube and cloud resources as platform for seamless geospatial computation

Giuliano Andrea Pagani, Luca Trani
2018 Proceedings of the 15th ACM International Conference on Computing Frontiers - CF '18  
The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the author.  ...  This thesis has been submitted in fulfilment of the requirements for a postgraduate degree (e.g. PhD, MPhil, DClinPsychol) at the University of Edinburgh.  ...  The concept of data cube appeared in the 1990s in the Business Intelligence domain.  ... 
doi:10.1145/3203217.3205861 dblp:conf/cf/PaganiT18 fatcat:6dtd24cgibfx5ob3qkykfgbjvq

Evolution and application of digital technologies to predict crop type and crop phenology in agriculture

A B Potgieter, Yan Zhao, Pablo J Zarco-Tejada, Karine Chenu, Yifan Zhang, Kenton Porker, Ben Biddulph, Yash P Dang, Tim Neale, Fred Roosta, Scott Chapman
2021 in silico Plants  
in the collating, analysing and application of "BIG DATA" systems, especially in agriculture.  ...  This also has a profound impact on food security, and thus livelihoods, in many parts of the world.  ...  However, the method is sensitive to missing data and the presence of cloud/shadow pixels.  ... 
doi:10.1093/insilicoplants/diab017 fatcat:h274vgwhmvdwbgublnbim4ob6q

Design for Microassembly - A Methodology for Product Design and Process Selection

C. Tietje, S. Ratche
2007 2007 IEEE International Symposium on Assembly and Manufacturing  
The summary of a comprehensive literature review is given in chapter 2.  ...  The survey provides results of studies closely related to the work reported in this thesis and relates that work to a larger ongoing dialogue about the topic of assembly and design in the microworld.  ...  Figure 6 : 6 Allocation of DFp.A within micro engineering (adapted from Figure 7 : 7 Classical product lifecycle Figure 9 : 9 Sequential versus integrated product development in the product lifecycle  ... 
doi:10.1109/isam.2007.4288469 fatcat:4ylvlruh2jaqtjteudiw6auz2e

Haptic Assembly and Prototyping: An Expository Review [article]

Morad Behandish, Horea T. Ilies
2017 arXiv   pre-print
The main focus is on revisiting definitions and classifications of different methods used to handle the constrained multibody simulation in real-time, ranging from physics-based and geometry-based to hybrid  ...  In spite of numerous research and development efforts over the last two decades, the industrial adoption of haptic-assisted VP/VA has been slower than expected.  ...  An important caveat is related to proper differentiation of the motion of the haptic proxy from discrete encoder readings in the presence of the added noise and device errors.  ... 
arXiv:1712.00750v1 fatcat:gwkmw5qbqbgb5feiwzzp2qbkli

29th International Conference on Data Engineering [book of abstracts]

2013 2013 IEEE 29th International Conference on Data Engineering Workshops (ICDEW)  
However, even a well-tuned optimizer cost model will fail in the presence of errors in cardinality estimates.  ...  The technique was recently revisited in the context of MonetDB, a system that by default materializes all intermediate results.  ...  These volunteers welcome participants, give directions, help in the sessions and on the registration desk, and generally make sure the conference is running smoothly.  ... 
doi:10.1109/icdew.2013.6547409 fatcat:wadzpuh3b5htli4mgb4jreoika

Locality, Statefulness, and Causality in Distributed Information Systems (Concerning the Scale Dependence Of System Promises) [article]

Mark Burgess
2019 arXiv   pre-print
This paper outlines the simple view of state and causation in Promise Theory, which accounts for the scaling of processes and the relativity of different observers in a natural way.  ...  A simple principle may be substituted in most cases as a guide to system design: the principle the separation of dynamic scales.  ...  Each process has a lifecycle of major states that characterize it, which we can call epochs in the lifecycle of the process. • Definition (of promises). • Initialization of resources (Initial state). •  ... 
arXiv:1909.09357v1 fatcat:keg7fy6r6ngkvghcuw3xu4myv4

Addressing Application Bottlenecks: Distributed Memory [chapter]

Alexander Supalov, Andrey Semin, Michael Klemm, Christopher Dahnken
2014 Optimizing HPC Applications with Intel® Cluster Tools  
Following this pragmatic approach, in this chapter we will show how to detect and exploit optimization opportunities in the realm of communication patterns.  ...  The first application optimization level accessible to the ever-busy performance analyst is the distributed memory one, normally expressed in terms of the Message Passing Interface (MPI). 1 By its very  ...  of the system, either at fixed time intervals or at certain points of the program or system lifecycle.  ... 
doi:10.1007/978-1-4302-6497-2_5 fatcat:aozzgrkxmrasnm54ufvvkwr4g4
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