Synthetic data (Total 511029 Papers Found)

We present a novel message passing algorithm for approximating the MAP problem in graphical models. The algorithm is similar in structure to max-product but unlike max-product it always converges, and can be proven to find the exact MAP solution in various settings. The algorithm is derived via block coordinate descent in a dual of the LP relaxation of MAP, but does not require any tunable parameters such as step size or tree weights. We also describe a generalization of the method to cluster ba ...
The RDF data model is gaining importance for applications in computational biology, knowledge sharing, and social communities. Recent work on RDF engines has focused on scalable performance for querying, and has largely disregarded updates. In addition to incremental bulk loading, applications also require online updates with flexible control over multi-user isolation levels and data consistency. The challenge lies in meeting these requirements while retaining the capability for fast querying. T ...
If a piece of information is released from a media site, can we predict whether it may spread to one million web pages, in a month ? This influence estimation problem is very challenging since both the time-sensitive nature of the task and the requirement of scalability need to be addressed simultaneously. In this paper, we propose a randomized algorithm for influence estimation in continuous-time diffusion networks. Our algorithm can estimate the influence of every node in a network with |V| no ...
Thermal energy storage can enhance the utility of parabolic trough solar power plants by providing the ability to match electrical output to peak demand periods. An important component of thermal energy storage system optimization is selecting the working fluid used as the storage media and/or heat transfer fluid. Large quantities of the working fluid are required for power plants at the scale of 100-MW, so maximizing heat transfer fluid performance while minimizing material cost is important. T ...
Time-course microarray experiments study the progress of gene expression along time across one or several experimental conditions. Most developed analysis methods focus on the clustering or the differential expression analysis of genes and do not integrate functional information. The assessment of the functional aspects of time-course transcriptomics data requires the use of approaches that exploit the activation dynamics of the functional categories to where genes are annotated. We present thre ...
Retinoic acid (RA) is the form of vitamin A that controls differentiation and proliferation of epithelia. Our previous work established that normal breast epithelia synthesize RA from retinol, an ability retained by three immortalized but nontumorigenic cell lines but lost in five of six breast cell lines. In this work, we characterize the cause of this defect in one of the lines, the MCF-7 line. We have determined that the immortalized but nontumorigenic cell line, MTSV1.7, capable of synthesiz ...
Given a multidimensional point q, a reverse k nearest neighbor (RkNN) query retrieves all the data points that have q as one of their k nearest neighbors. Existing methods for processing such queries have at least one of the following deficiencies: they (i) do not support arbitrary values of k, (ii) cannot deal efficiently with database updates, (iii) are applicable only to 2D data but not to higher dimensionality, and (iv) retrieve only approximate results. Motivated by these shortcomings, we d ...
This memo describes SIV (Synthetic Initialization Vector), a block cipher mode of operation. SIV takes a key, a plaintext, and multiple variable-length octet strings that will be authenticated but not encrypted. It produces a ciphertext having the same length as the plaintext and a synthetic initialization vector. Depending on how it is used, SIV achieves either the goal of deterministic authenticated encryption or the goal of nonce-based, misuse-resistant authenticated encryption. ...
Snow is an important component of the water cycle, and its estimation in hydrological models is of great significance concerning the simulation and forecasting of flood events due to snow-melt. The assimilation of Snow Cover Area (SCA) in physical distributed hydrological models is a possible source of improvement of snowmelt-related floods. In this study, the assimilation in the LISFLOOD model of the MODIS sensor SCA has been evaluated, in order to improve the streamflow simulations of the mode ...
A recurring challenge in the design of genetic circuits is context dependence, the fact that the behavior of a functional module is influenced by the state of the wider cellular milieu with which it interacts. One key player in context dependence is the scarcity of shared cellular resources, especially those required for transcription and translation during gene expression. Because of competition for these limited resources, the behavior of modules becomes coupled in subtle ways, preventing circ ...
The precise alignment of a 3D model to 2D sensor images to recover the pose of an object in a scene is an important topic in computer vision. In this work, we outline a registration scheme to align arbitrary standard 3D models to optical and synthetic aperture radar (SAR) images in order to recover the full 6 degrees of freedom of the object. We propose a novel similarity measure which combines perspective contour matching and an appearance-based Mutual information (MI) measure. Unlike previous ...
The description and development are described of a multidimensional continuous wavelet transform for synthetic aperture radar (SAR) image analysis, especially for the analysis of ‘dispersive’ reflectors located on a ground illuminated by a SAR. The usual imaging process makes the assumption that the reflectors are isotropic (i.e. that they behave the same way regardless of the angle from which they are viewed) and white (they have the same properties within the emitted frequency bandwidth). ...
Nanoparticles have increasingly been used for a variety of applications, most notably for the delivery of therapeutic and diagnostic agents. A large number of nanoparticle drug delivery systems have been developed for cancer treatment and various materials have been explored as drug delivery agents to improve the therapeutic efficacy and safety of anticancer drugs. Natural biomolecules such as proteins are an attractive alternative to synthetic polymers which are commonly used in drug formulatio ...
This research introduces compressed sensing (CS) principle into inverse synthetic aperture radar (ISAR) imaging of nonuniform rotation targets, and high azimuth resolution can be achieved with limited number of pulses. Firstly, the sparsity of the echoed signal of radar targets with non-uniform rotation in certain matching Fourier domain is analyzed. Then the restricted isometry property (RIP) and incoherence of partial matching Fourier matrices are checked, following which an ISAR imaging metho ...
Peroxisome Proliferator-Activated Receptor γ (PPARγ) full agonists are molecules with powerful insulin-sensitizing action that are used as antidiabetic drugs. Unfortunately, these compounds also present various side effects. Recent results suggest that effective PPARγ agonists should show a low transactivation activity but a high binding affinity to inhibit phosphorylation at Ser273. We use several structure activity relationship studies of synthetic PPARγ agonists to explore the different b ...
A variety of ways has been established to detect defects found on printed circuit boards (PCB). In previous studies, defects are categories into seven groups with a minimum of one defect and up to a maximum of 4 defects in each group. Using Matlab image processing tools this research separates two of the existing groups containing two defects each into four new groups containing one defect each by processing synthetic images of bare through-hole single layer PCBs. ...
The present work was conducted for Arsenic (III) removal, which one of the most poisonous groundwater pollutants, by synthetic nano size zerovalent iron (nZVI). Batch experiments were performed to investigate the influence of As (III), nZVI concentration, pH of solution and contact time on the efficiency of As (III) removal. nZVI was synthesized by reduction of ferric chloride by sodium borohydrid. SEM and XRD were used to determine particle size and characterization of produced nanoparticles. U ...
Gallic acid and its derivatives are widely present in the plant kingdom and are known to display antioxidant activity by the ability to counteract the damaging effects of free radicals in tissues and thus are believed to protect against cancer, arteriosclerosis, heart disease, and several other diseases. Hence, the present work describes the isolation of gallic acid derivatives from the ethyl acetate fraction of leaves of T. bangwensis. The structures of three phenolic acids of gallic acid deriv ...
We have built user environments that simplify and provide interactive access to data, models, and compute resources as well as integrate various distributed computational services to study earthquake waveforms utilizing 3D models and compute resources within the Geosciences Network (GEONgrid) and national computational grids, such as TeraGrid. These data and computing services are implemented using a Web services approach and are incorporated in a service-based portal architecture. We then illus ...
Selective catalysts that activate small molecules such as hydrocarbons, dioxygen, water, carbon dioxide and dihydrogen are central to new technologies for the use of alternative energy sources. For example, controlled hydrocarbon functionalization can lead to high impact technologies, but such catalysts require a level of molecular control beyond current means. The Center for Catalytic Hydrocarbon Functionalization facilitates collaborations among research groups in catalysis, materials, electro ...
UWB radar is superior to the conventional narrowband radar for through wall imaging applications due to its good penetration characteristics, robustness to multipath reflection, and excellent performance in severe clutter environment. A reconfigurable UWB synthetic aperture radar (SAR) was previously implemented to detect/track the real-time position of static/moving targets behind the wall [1]. In this paper, we extend this system into a 3-D imaging radar, which goes beyond targets localization ...
Biosynthetic hypotheses of organic chemists found practical applications initially in assisting the determinations of the structures of natural products. They later contributed to biochemical work by suggesting what incorporations of isotopically labelled precursors should be examined. They also postulated biochemical mechanisms, including predictions such as C-methylation from methionine and the involvement of carbonium ion cyclisations in terpenoid biosynthesis. The incorporations of precursor ...
The difference between native speakers’ and non-native speakers’ naturalness judgements of synthetic speech is investigated. Similar/difference judgements are analysed via a multidimensional scaling analysis and compared to Mean opinion scores. It is shown that although the two groups generally behave in a similar manner the variance of non-native speaker judgements is generally higher. While both groups of subject can clearly distinguish natural speech from the best synthetic examples, the ...
Pyrazoles are an important class of five membered heterocyclic compounds; are widely found as the core structure in a large variety of compounds that possess important agrochemical and pharmaceutical activities. Pyrazoles have been the recent target of numerous methodologies, mostly due to their prevalence as scaffolds in synthesis of bioactive compounds and reactions in different media. The aim of this review is to provide an up to date developments in the synthetic strategies, biological activ ...
This paper proposes an approximate model of fisheye camera based on the optical refraction. The model of fisheye lens is firstly derived from the optical refraction and the structure of fisheye lenses. Secondly, a suitable linearization of the fisheye model is developed in order to obtain an approximate model, and the approximate model including two parameters is constructed from the linearization of the fisheye model. Finally, the estimation algorithm on the model parameters is presented using ...
Given genetic networks derived from two genomes, it may be difficult to decide if their local structures are similar enough in both genomes to infer some ancestral configuration or some conserved functional relationships. Current methods all depend on searching for identical substructures. We explore a generalized vertex proximity criterion, and present analytic and probability results for the comparison of random lattice networks. We apply this criterion to the comparison of the genetic network ...
Energy has become fundamental human needs throughout the world. One form of renewable energy as an alternative fuel is hydrogen fuel cell. Fuel cell is an electrochemical device that can convert chemical energy directly into electrical energy and heat with high efficiency and a low negative impact on the environment. Direct Ethanol Fuel Cell (DEFC) is one type of fuel cell that can utilize ethanol derived from biomass. Studies have shown that addition of sodium hydroxide is able to improve the p ...
Pictures of the double helix of deoxyribonucleic acid (DNA) have become so common that everyone is familiar with its overall shape and structure (Figure 1a).This structure is known as B-DNA, and represents an average conformation of DNA, based on fibre diffraction studies. However, this average shape of DNA is very unlikely to exist within the cells of living organisms, for several reasons. First, there is simply not enough room for the DNA to be stretched out in a perfect, linear B-DNA conforma ...
Porcine circovirus type 2 (PCV2) causes postweaning multisystemic wasting syndrome (PMWS) in growing pigs but generally requires the presence of other infectious or non-infectious factors to produce the full clinical expression of disease. These factors remain to be identified, but management routines, concurrent infections and maternal immunity are thought to influence the risk for PMWS outbreak in swine herds. Pigs presenting with PMWS develop severe immunosuppression and the work of this thes ...
Time reversal techniques are widely used in electromagnetic imaging and localization of buried objects. In a wideband study, the localization of an object requires the determination of an instant of focus, that is, the instant when the energy of the backpropagated scattered fields reaches its location. We consider a new criterion (recently introduced) for choosing this instant of focus and we compare it with the minimum entropy criterion existing in the literature. We present the results obtaine ...
Alpha-bsm ® is a first generation self-setting, injectable and moldable apatitic calcium phosphate cement (CPC) based on amorphous calcium phosphate (ACP). ACP was prepared using low temperature double decomposition technique, from a calcium solution (0.16 M), and phosphate solution (0.26 M) in a basic (pH~13) media. ACP was than stabilized using three crystal growth inhibitors (CO3 2, Mg 2+ , P2O7 4), freeze-dried, and heated (450 oC, 1h) to remove additional moisture and some inhibitors. Dica ...
Synthetic aperture radar (SAR) is one of the most widely used remote sensing modalities, providing images for a variety of applications including those in defense, environmental science, and weather forecasting. However, conventionally formed SAR imagery from undersampled observed data, arising in several emerging applications and sensing scenarios, suffers from artifacts that might limit effective use of such imagery in remote sensing applications. Recently, sparsity-driven SAR imaging has emer ...
LNCaP cells represent a useful tool to explore the mechanism of sex hormone action on cell proliferation in an "in culture-in animal" model. Results indicated that: (a) these cells were inhibited from proliferating for extended periods (up to 30 days) when placed in charcoal-dextranstripped sera; they remained, however, viable because they proliferated when sex hormones were added to this medium; (b) the inhibitory effect of sera was reversed by the addition of Sa-dihydrotestosterone at 3 x I0~" ...
The use of cloud computing that provides resources on demand to various types of users, including enterprises as well as engineering and scientific institutions, is growing rapidly. An effective resource management middleware is necessary to harness the power of the underlying distributed hardware in a cloud. Two of the key operations provided by a resource manager are resource allocation (matchmaking) and scheduling. This paper concerns the problem of matchmaking and scheduling an open stream o ...
Estimation of network proximity among nodes is an important building block in several applications like service selection and composition, multicast tree formation, and overlay construction. Recently, scalable techniques have been proposed to estimate inter-node latencies, including network coordinate systems like GNP and Vivaldi. However, existing mechanisms for querying such information do not scale well to a very large number of nodes, when one wants to accurately find a set of nodes globally ...
In the present study experiments were conducted inthe lab to investigate the efficiency of stock solutions obtained from the herbs of Moringa Oleifera (Drum sticks) , Okra gum , and the mucilage isolated from the dry flowers of C.Procera as flocculent for the treatment of turbid water samples containing synthetic turbidity caused by clay materials. Jar test experiments were carried out for high(250NTU and 500NTU), low levels (15NTU,30NTU and 50 NTU) and medium level(100NTU) of turbidity with the ...
During normal synthetic aperture radar (SAR) processing, the flat earth's surface is usually assumed when performing time-domain imaging. However, this assumption induces the geometric error in imaging, thereby influencing the focusing quality. The effect of this assumption on time-domain imaging of rolling terrain for one-stationary bistatic UWB SAR is examined in this study. Based on the imaging analysis of the linear flight geometry case, it is found that this assumption will lead to some pro ...
NIR polymethine cyanine dyes exhibit long wavelengths that cannot be detected by the naked eye, whereas normal biological tissues fluoresce in the visible region of the electromagnetic spectrum. Using FLARE (Fluorescence-Assisted Resection and Exploration) imaging technology, both visible and NIR light can now be superimposed and visualized simultaneously. This technology has increased research in the field of biological contrast imaging agents. Polymethine cyanine dyes have shown specificity fo ...
ters prepared by an international team of well known experts. In Part I consisting of eight chapters, structure and properties of endotoxins are considered. Chapters 1 3 highlight characterization of lipopolysaccharides (LPS) of Gram negative bacteria, their purification, and the relationship between their structure, function, and activity. Chapters 4 6 deal with the diversity of core oligosaccharide in LPS, Salmonella regulated LPS mod ifications, and variation of O antigens in Gram negative ba ...
We present in situ measurements of the unit-cell volume of a natural terrestrial ilmenite (Jagersfontein mine, South Africa) and a synthetic reduced ilmenite (FeTiO3) at simultaneous high pressure and high temperature up to 16 GPa and 1273 K. Unit-cell volumes were determined using energy-dispersive synchrotron X-ray diffraction in a multi-anvil press. Mössbauer analyses show that the synthetic sample contained insignificant amounts of Fe3+ both before and after the experiment. Results were fit ...
Twenty-eight taxa of Helianthus collected throughout the United States and grown in afield nursery were evaluated for yields of oil, polyphenol hydrocarbon, protein, and ash in above-ground biomass. Hydrocarbons were examined for the presence of rubber, gutta, and waxes. Rubber and gutta were analyzed for weight-average molecular weight (ìw) and molecular weight distribution (MWD). Helianthus ciliaris had the highest oil yield (3.7%) and was analyzed for yield of fatty acids and unsaponifiable ...
The integrated nested Laplace approximation (INLA) [Rue et al., 2009] is now a well-known functional approximation algorithm for implementing Bayesian inference in latent Gaussian models but has some limitations: it is unable to handle a high dimensional model parameter θ, and makes a poor approximation when the posterior is multi-modal and the likelihood is highly nonGaussian. Two types of algorithm are proposed to address these limitations: (a) a combination of INLA and Monte Carlo methods an ...
We consider the problem of learning Bayes Net structures for related tasks. We present a formalism for learning related Bayes Net structures that takes advantage of the similarity between tasks by biasing toward learning similar structures for each task. Heuristic search is used to find a high scoring set of structures (one for each task), where the score for a set of structures is computed in a principled way. Experiments on synthetic problems generated from the ALARM and INSURANCE networks sho ...
The elevation and movement history of radar scat-terers can be obtained using interferometric synthetic aperture radar (InSAR) data. For any coherent imaging radar, the phase measurements for scatterers are expressed modulo 2π, causing ambiguity in the measurements. The phase measurements therefore must be “unwrapped” over all the data dimensions. Each synthetic aperture radar (SAR) image is collected in the two spatial dimensions of radar geometry: azimuth and range. Multip ...
S U M M A R Y We present a spherical wavelet-based multiscale approach for estimating a spatial velocity field on the sphere from a set of irregularly spaced geodetic displacement observations. Because the adopted spherical wavelets are analytically differentiable, spatial gradient tensor quantities such as dilatation rate, strain rate and rotation rate can be directly computed using the same coefficients. In a series of synthetic and real examples, we illustrate the benefit of the multiscale ap ...
Biclustering has many applications in various fields such as pattern classification, information retrieval, data mining and functional annotation. Biclustering extracts accurate information from gene expression datasets by clustering rows and columns of a dataset simultaneously. In this paper, a new multi-objective evolutionary biclustering framework based on strength Pareto front evolutionary algorithm (SPEA2) is proposed. A heuristic search is added into SPEA2 to delete and add genes and condi ...
Product affinity segmentation is a powerful technique for marketers and sales professionals to gain a good understanding of customers’ needs, preferences, and purchase behavior. Performing product affinity segmentation is quite challenging in practice because product level data usually have high skewness, high kurtosis, and large percentage of zero values. The Doughnut clustering method has been shown to be effective using real data, and was presented at SAS Global Forum 2013 (Baer & Chakrabor ...
Euclid RTP 11.13 was a major initiative to promote the use of synthetic environments (SEs) in Europe. One of the main results from the programme was the concept of the SE development environment (SEDE) for creating and utilising SEs, which is analogous to an integrated development environment for developing software applications. The purpose of the SEDE is to provide a facility that will assist the different types of SE users i.e. Problem Setters, Problem Solvers, and SE Implementers, so that SE ...
The aim of this study was to evaluate whether yerba maté alcoholic extracts at very low concentrations (0.01 and 0.1%), prevent/retard lipid peroxidation in beef hamburgers without impairing sensory acceptability. For this TBARs and hexanal levels, fatty acid profile and cholesterol oxides were evaluated as oxidation parameters in beef hamburgers during 90 days’ storage. The addition of 0.01% yerba maté ethanolic extracts proved inefficient in restraining the lipid peroxidation while the add ...
Limited capture range and the requirement to provide high quality initialisation for optimisation-based 2D/3D image registration methods can significantly degrade the performance of 3D image reconstruction and motion compensation pipelines. Challenging clinical imaging scenarios, which contain significant subject motion such as fetal in-utero imaging, complicate the 3D image and volume reconstruction process. In this paper we present a learning based image registration method capable of predicti ...