Sparse Data Research Papers - Academia.edu (original) (raw)

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- Geology, Geochemistry, Time Series, Temperature Dependence

In the On Line Analytical Processing (OLAP) context, ex-ploration of huge and sparse data cubes is a tedious task which does not always lead to efficient results. In this paper, we couple OLAP with the Multiple Correspondence Analy-sis... more

- by Julita Vassileva
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- Social Computing, Social learning, Collaborative Filtering, ITS
- by Cláudio Silva
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- Computer Graphics, Animation, Computational Geometry, Image-based Rendering
- by Mukkai Krishnamoorthy
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- Collaborative Filtering, Random Walk, Sparsity, Recommender System
- by Norman Fenton
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- Information Systems, Risk assessment, Bayesian Networks, Computer Software
- by Charles Kemp
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- Probability Theory, Cognition, Intuition, Knowledge Representation
- by Jianshu Chen
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- Information Theory, Energy Conservation, Network Analysis, Multidisciplinary
- by Shaul Markovitch
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- Cognitive Science, Mathematics, Natural Language Processing, Classification

On 21 October 1999, a severe thunderstorm developed over areas 50 km south of Johannesburg. This weather system produced a large tornado (F3 on the FP scale) which crossed the Heidelberg farming district (between Vanderbiljpark and Secunda). Relatively little damage occurred, but there were minor injuries and damage to property. In this paper the event is analyzed by means of all available observation data, including conventional radar data which showed significant reflectivities as well as good reflectivity gradient. The authors also made use of the 0 and 6 h fields of the local version of the Eta model (48 km resolution) in order to supplement the sparse data coverage over the country. Indications of instability and shear were analyzed on plan view as well as by means of model soundings. Several indicators of severe weather and possible tornadic activity could be found. Although only a few tornadoes occur every year in South Africa, these events cause damage and loss of life. It i...

- by A. Goliger
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- South Africa, Sparse Data

Geological sequestration can be used to reduce greenhouse CO2 emissions to the atmosphere. The three potential geological storage options are depleted oil and gas reservoirs, deep saline aquifers, and unminable coal beds. Subsurface monitoring will be necessary for leak detection, to provide information for optimizing injection, and to support the safety case that will be required for site licensing. Leak detection is probably the main concern, though other applications such as monitoring for verification of sequestered ...

- by Youli Quan
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- Temporal Resolution, Oil and gas, Low Frequency, Feasibility Study

In the ecommerce services, there is a very important tool that will determine the success to increase number of buying and selling in the marketing target, that is how the user in finding products that are suitable to be purchased. This tool is called recommender system. Recommender system is important tool for establishing an effective communication between users and retailers in ecommerce business. Effective and enjoyable communication to find the product is considered to have a significant impact that increase of marketing achievement. Recommender system established in the mid-90s. Based on technical approach, there are four types of recommender system namely Collaborative, Contents Based, Knowledge Based and Demographic filtering. Collaborative filtering is considered to be more superior than another two methods. It offers obviously advantages in terms of serendipity, novelty and accuracy. Although it has some benefit. However, there is a critical problem in collaborative filtering that called cold start. It is a major problem to which many researchers have paid much more attention to this particular research interest. In response to this particular problem the critical review and analysis on state of the art of the current technology, some possible solutions including approach, method and techniques used have been identified but they need further validation.

- by Muhammad Hanafi
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- Recommender Systems, Ecommerce, Collaborative Filtering, Cold Start

The flow of oil-in-water emulsions through quartz micro-capillary tubes was analyzed experimentally. The capillaries were used as models of connecting pore-throats between adjacent pore body pairs in high-permeability media. Pressure drop between the inlet and outlet ends of the capillary was recorded as a function of time, for several values of the volumetric flow rate. Several distinct emulsions were prepared using synthetic oils in deionized water, stabilized by a surfactant (Triton X-100). Two oils of different viscosity values were used to prepare the emulsions, while two distinct drop size distributions were obtained by varying the mixing procedure. The average oil drop size varied from smaller to larger than the neck radius. The results are presented in terms of the extra-pressure drop due to the presence of the dispersed phase, i.e. the difference between the measured pressure drop and the one necessary to drive the continuous phase alone at the same flow rate. For emulsions...

- by Vladimir Alvarado
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- Engineering, Multiphase Flow, Enhanced Oil Recovery, Porous Media
- by Janok Bhattacharya
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- Geology, Geophysics, Sparse Data, Large Scale

Triterpenoid saponins and structurally related steroidal glycoalkaloids are a large and diverse family of plant glycosides. The importance of these compounds for chemical protection of plants against microbial pathogens and/or herbivores is now well-documented. Moreover, these compounds have a variety of commercial applications, e.g. as drugs or raw materials for pharmaceutical industry. Until recently there were only sparse data on the biosynthesis of saponins and glycoalkaloids, especially at the enzyme level. Substantial progress has recently been made, however, in our understanding of biosynthetic routes leading to the formation of the diverse array of aglycone skeletons found in these compounds as well as mechanisms of synthesis of their sugar moieties. This review highlights some of the advances made over past two decades in our understanding of the formation and modification of sugar moieties in triterpenoid saponins and glycoalkaloids.

- by Henry Kurosawa
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- Organic Chemistry, Phytochemistry, Plant Biology, Pharmaceutical industry
- by Per Magne Ueland
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- Folic acid, Humans, Fasting, Female
- by Michael Halbleib
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- Environmental Engineering, Civil Engineering, Climatology, Peer Review
- by L K
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- Mathematics, Algorithms, Artificial Intelligence, Information Theory
- by Vered Aharonson
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- Cognitive Technologies, Subject Areas, Sparse Data, Curse of Dimensionality
- by Fuat Demirci
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- Urinary incontinence, Humans, Female, Pulmonary Embolism

In high seismic regions, post-tensioned (PT) slab-column frames are commonly used to support gravity loads in conjunction with a lateral-force resisting system (LFRS; e.g., a core wall). The LFRS is designed to resist 100% of the design lateral forces as well as to limit lateral displacements to an acceptable level, whereas the slab-column frame must sustain the gravity loads under the expected (design) displacements. Given the relatively sparse data on the seismic performance of PT flat plate frames, cyclic tests of four interior PT slab-column connections were conducted. Primary test variables were the level of gravity shear at the slab-column connection and the slab tendon arrangement. Test results indicate that both the test variables strongly influence the cyclic behavior of the PT connections, and that the use of slab bottom reinforcement at the slab-column connection was effective in resisting positive moment developed under lateral loading as well as improving the hysteretic...

- by SEONG-HOON KEE
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- Civil Engineering, Structural Engineering, Energy Dissipation, Sparse Data
- by Axel Bronstert
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- Environmental Engineering, Civil Engineering, Sparse Data, Statistical Model
- by Sivakumar Thangaraju
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- Depression, India, Case Report, Humans

Riassunto. La mappatura dei dati geofisici costituisce il passo finale della interpretazione e ne costituisce una delle fasi più delicate. Tale operazione quindi deve essere accurata e rappresentare al meglio il fenomeno o la struttura geologica, oggetto di studio. Nel presente lavoro vengono messe a confronto due differenti filosofie di operatività con l'interpolazione bivariata, su una griglia regolare, ai fini

- by L. Facchin and +1
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- Data Collection, Trend Analysis, Sparse Data, Ross Sea
- by Lon Hood and +1
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- Multidisciplinary, Global change, Seasonality, Standard Deviation
- by Helge Bormann and +1
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- Environmental Engineering, Civil Engineering, Evapotranspiration, Water balance
- by tobias sauter
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- Engineering, Earth Sciences, Climate Change, Seasonality
- by Adriano Lopes
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- Computer Graphics, Animation, Computational Geometry, Image-based Rendering
- by Carlo H Séquin
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- Mechanical Engineering, Computer Aided Design, CAD, Geometric model
- by Heidi Kecskemethy and +1
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- Adolescent, Lumbar spine, Humans, Child
- by luca pietranera
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- Engineering, Civil Engineering, Cartography, Geology

This paper introduces a novel method for accelerated dynamic image acquisition for cardiac MRI. This method combines two different formalisms for reconstruction from sparse data by incorporation of prior information. Parallel imaging uses information about coil geometry in imaging systems with multiple receiver coils. Reduced field of view (rFOV) imaging exploits knowledge about static regions in a dynamic image scene. The novel method combines the SPACE-RIP implementation of parallel imaging with the Noquist ...

- by Marijn Brummer
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- Computer Science, Pediatrics, Magnetic Resonance Imaging, MRI

- by Jerry Harris
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- Temporal Resolution, Oil and gas, Low Frequency, Feasibility Study
- by Cornelia Landersdorfer
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- Algorithms, Monte Carlo, Pharmacokinetics, Computer Simulation
- by Ahmad Putra
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- Real-time rendering, Singular value decomposition, High performance, Sparse Data
- by David Marquez
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- Information Systems, Risk assessment, Bayesian Networks, Computer Software
- by Tim Payn and +1
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- Data Mining, Forest Ecology And Management, Forest Ecology, Biological Sciences
- by Xinbo Gao
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- Engineering, Algorithms, Image Processing, Machine Learning
- by David Gustafsson and +1
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- Environmental Engineering, Civil Engineering, Evapotranspiration, Water balance
- by Russell Hull
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- Nuclear medicine, Nuclear, Humans, Pulmonary Embolism