Miracle-dz/UniFAR-FTUs huggingface dataset:
The Drift Burst Hypothesis

The Drift Burst Hypothesis postulates the existence of short-lived locally explosive trends in the price paths of financial assets. The recent US equity and Treasury flash crashes can be viewed as two high profile manifestations of such dynamics, but we argue that drift bursts of varying magnitude are an expected and regular occurrence in financial markets that can arise through established mechanisms such as feedback trading. At a theoretical level, we show how to build drift bursts into the continuous-time Ito semi-martingale model in such a way that the fundamental arbitrage-free property is preserved. We then develop a non-parametric test statistic that allows for the identification of drift bursts from noisy high-frequency data. We apply this methodology to a comprehensive set of tick data and show that drift bursts form an integral part of the price dynamics across equities, fixed income, currencies and commodities. We find that the majority of identified drift bursts are accompanied by strong price reversals and these can therefore be regarded as “flash crashes” that span brief periods of severe market disruption without any material longer term price impacts.
Extending the Devices Profile for Web Services ( DPWS ) standard using a REST proxy

The OASIS standard Devices Profile for Web Services (DPWS) enables the use of Web services for service -oriented and event-driven Internet of Things (IoT) applications. DPWS has been proven to be an appropriate technolo gy f r implementing services on resource-constrained devic es. However, the performance of these services has not been well investigated to realize DPWS features such as dynam ic discovery and eventing mechanisms for IoT scenar ios. Moreover, DPWS introduces considerable overhead due to the us e of Simple Object Access Protocol (SOAP) envelopes in xchange messages. We extend the DPWS standard by using a Re presentational State Transfer (REST) proxy to tackl e these problems, creating RESTful Web APIs to pave the way for developers to invest more in this technology.
A simple and efficient solver for self-gravity in the DISPATCH astrophysical simulation framework

We describe a simple and effective algorithm for solving Poisson’s equation in the context of self-gravity within the DISPATCH astrophysical fluid framework. The algorithm leverages the fact that DISPATCH stores multiple time slices and uses asynchronous time-stepping to produce a scheme that does not require any explicit global communication or sub-cycling, only the normal, local communication between patches and the iterative solution to Poisson’s equation. We demonstrate that the implementation is suitable for both collections of patches of a single resolution and for hierarchies of adaptively resolved patches. Benchmarks are presented that demonstrate the accuracy, effectiveness and efficiency of the scheme.
Activation of Notch-1 enhances epithelial-mesenchymal transition in gefitinib-acquired resistant lung cancer cells

Objective To investigate whether the Notch-1 signaling pathway is involved in the acquisition of the epithelial-mesenchymal transition (EMT) phenotype of gefitinib-acquired resistant lung cancer cells. Methods The PC9 cell line (harboring EGFR exon 19 deletion) and PC9/AB2 cells (gefitinib-acquired resistant PC9 cells) were used. siRNA targeting Notch-1 eukaryotic expression vector (siNotch-1) was constructed and PC9/AB2 cells were transfected with siNotch-1. The protein expression of EGFR, Akt, Erk, Notch receptors and ligands, TGF-β receptors, E-cadherin, Vimentin, and Snail were detected by Western blot assay. DNA sequencing and fluorescence in situ hybridization (FISH) analysis were processed to detect mutation of EGFR exon 20 and MET amplification, respectively. For cytotoxicity assay, cell viability was assessed by Cell Counting Kit 8. Results Gefitinib resistant cell line PC9/AB2 had no evidence of MET amplification or EGFR T790M mutation. The expression of Notch-1 was upregulated in gefitinib resistant PC9/AB2 cells compared with that in gefitinib-sensitive PC9 cells. There were no significant protein expression differences of other Notch receptors, Notch ligands or TGF-β receptors between both paired cell lines. Western blot results showed that protein expression of E-cadherin was greatly reduced in PC9/AB2 cells, while elevated levels of Vimentin and Snail were observed. A significant reduction of the expression of Snail and Vimentin in Notch-1 siRNA transfected PC9/AB2 cells with increased E-cadherin expression was found by Western blot assay. PC9/AB2 cells displayed a round like cell morphology after Notch-1 siRNA transfection. Silence of Notch-1 decreased colony-formation ability but enhanced sensitivity of gefitinib on PC9/AB2 cells. Conclusion Notch-1 might play a novel role in acquired resistance to gefitinib, which could be reversed by inhibiting Notch-1. Key words: Notch; Epidermal growth factor receptor; Drug resistance; Epithelial-mesenchymal transition
A Generalized Threat Taxonomy for Cloud Computing

This paper presents a genre-based, generalized threat taxonomy for cloud computing. Cloud computing provides numerous possibilities and challenges but the nature of cloud computing exposes the resources of a cloud architecture to a wide range of threats. Presently, many potential threats, represented as security concerns, are known in a general sense but they are not classified specifically in relation to cloud services delivery. Therefore security concerns need identification and assessment and presented in a consistent and hierarchical form. We posit that to approach the issue in this way allows for more effective enforcement and therefore better resilience in a cloud architecture. We further posit that failure to effectively identify threats will lead to lower levels of trust, effectiveness and performance. The generalized threat taxonomy provides researchers with a framework through which risk factors and threats may be identified; and related against an overall picture of threat patterns.
Removal of Heavy Metals from Aqueous Solutions Using Multi-Metals and Antibiotics Resistant Bacterium Isolated from the Red Sea, Egypt

This investigation was incorporate screening for the highest multiple metal and antibiotics resistant marine bacteria at the Northern Red Sea. The two selected bacterial isolates were identified on the basis of phenotypic and genotypic characterization through 16S rDNA gene technique as Alteromonas macleodii and Nitratireductor basaltis. A. macleodii revealed high efficiency in the removal of heavy metals from aqueous solution. Different factors influenced the removal of heavy metals from aqueous solution by A. macleodii such salinity, pH, temperature, biomass and contact time were optimized. The metal removal was greater at the lowest initial metal concentration (50 mg l-1) and decreased with increase in the metal concentration. A. macleodii showed high efficiency in biosorption of different metals in single and multiple metal solution systems. Removal percentage of different metals by A. macleadii in a single metal system at the highest tested metal concentrations (200 mg l-1) reached Pb, 73.8%; Mn, 66%; Fe, 65%; Cu, 64%; Zn, 62%; Ni, 54%; and Cd, 53%. In multiple metal systems containing 30 mg l-1 of different metals, biosorption percentage was Pb, 93%; Fe, 89%; Zn, 55%; Cd, 50%; Cu, 44.5%; Mn, 40% and Ni, 36%. These findings suggest the possibility of using these bacterial isolates for bioremediation of heavy metals from heavy metal contaminated ecosystem.
New Waveguide Fabrication Techniques for Next-generation PLCs

New waveguide fabrication techniques will be needed to make highly functional next-generation planar lightwave circuits (PLCs). After first reviewing the basic PLC fabrication process, this article describes recent progress in waveguide fabrication techniques. In particular, it describes a fabrication technique designed to make an ultralow loss waveguide for large-scale optical circuits, a fabrication technique that can produce ultra-compact optical circuits for high-density integration, and a laser direct writing waveguide fabrication technique whose goal is flexible waveguide formation and high-density integration.
Lie groupoids and algebroids applied to the study of uniformity and homogeneity of Cosserat media

A Lie groupoid, called second-order non-holonomic material Lie groupoid, is associated in a natural way to any Cosserat medium. This groupoid is used to give a new definition of homogeneity which does not depend on a material archetype. The corresponding Lie algebroid, called second-order non-holonomic material Lie algebroid, is used to characterize the homogeneity property of the material. We also relate these results with the previously obtained ones in terms of non-holonomic second-order [Formula: see text]-structures.
D 1 . 3 : Final report on user interface studies , cognitive and user modelling

The notion of literal translation has been defined in many different ways in a large number of studies in translationand in bilingualism research that also address related issues. This paper introduces a novel metric to quantify literality of translations and applies it to from-scratch translation and machine translation post-editing. We develop a recursive model of translation production, which is based on the theory of shared combinatorial nodes and which explains our observations during translation production. We analyse a large corpus of translation data and show that our literality metric correlates well with productionand reading times during translation and post-editing. The introduced literality metric, together with the recursive model of translation production are powerful means to assess processes during translation and post-editing.
Identifying eroding and depositional reaches of valley by analysis of suspended sediment Transport in the Sacramento River, California

Spatial patterns in suspended sediment transport and storage along the Sacramento River were assessed by evaluating the suspended sediment budget for the main channel accounting for all tributaries and diversions. Time series analysis was employed to quantify the relationship between streamflow and suspended sediment concentration for gauging stations along the main channel and signature tributaries. Sediment concentration records (of 2‐yr duration) were extended using Box‐Jenkins transfer function models to calculate annual rates of suspended sediment discharge over a 32‐year period since dam construction on the Sacramento River. The suspended sediment budget was evaluated to identify reaches of net erosion or deposition. The results of the budget suggest the influence of tectonics and anthropogenic channel modification.
DAY-OFTHE-WEEK EFFECT : EVIDENCE FROM NINE SECTORS OF THE SOUTH AFRICAN STOCK MARKET DOUGLAS MBULULU

i Declaration . ii Acknowledgements . iii List of Tables . vi CHAPTER ONE: INTRODUCTION . 1 1.1 Context of research . 1 1.2 Objectives of the study. 3 1.3 Motivation for the study. 3 1.4 Organisation of the study. 4 CHAPTER TWO: LITERATURE REVIEW. 5 2.
Ensemble Methods and Random Forests

We have seen various analysis for classification and regression in the course. One of the common methods to reduce the generalization error is by using ensembles. We saw an example of this in the AdaBoost algorithm in one of the assignments. A way of understanding how classifiers and regressors work, is by looking at the bias-variance decomposition. After visiting that, we can view ensemble methods as trying to reduce either the bias, the variance or both. A particular ensemble method, the random forest is then introduced, and some theoretical results on the generalization error and variance are presented in the final sections.
Parkes full polarization spectra of OH masers – II. Galactic longitudes 240° to 350°

Full polarization measurements of 1665 and 1667-MHz OH masers at 261 sites of massive star formation have been made with the Parkes radio telescope. Here we present the resulting spectra for 157 southern sources, complementing our previously published 104 northerly sources. For most sites, these are the first measurements of linear polarization, with good spectral resolution and complete velocity coverage. Our spectra exhibit the well-known predominance of highly circularly polarized features, interpreted as $\sigma$ components of Zeeman patterns. Focusing on the generally weaker and rarer linear polarization, we found three examples of likely full Zeeman triplets (a linearly polarized $\pi$ component, straddled in velocity by $\sigma$ components), adding to the solitary example previously reported. We also identify 40 examples of likely isolated $\pi$ components, contradicting past beliefs that $\pi$ components might be extremely rare. These were recognised at 20 sites where a feature with high linear polarization on one transition is accompanied on the other transition by a matching feature, at the same velocity and also with significant linear polarization. Large velocity ranges are rare, but we find eight exceeding 25 km/s, some of them indicating high velocity blue-shifted outflows. Variability was investigated on timescales of one year and over several decades. More than 20 sites (of 200) show high variability (intensity changes by factors of four or more) in some prominent features. Highly stable sites are extremely rare.
Transient Interaction of a Spherical Shell with an Underwater Explosion Shock Wave and Subsequent Pulsating Bubble

The nonlinear interaction problem is analyzed by simultaneously solving the mass, momentum, and energy conservation equations together . with appropriate material constitutive equations governing the fluid dynamics of the explosion gaseous product and the water and the structural dynamics of the compliant shell. A finite difference technique in a coupled Eulerian–Lagrangian scheme is used. The computer program PISCES 2DELK is employed to carry out the numerical computations. The results demonstrate that to rigorously analyze the response of a submerged structure to a nearby explosion, the interactions among the explosion shock wave, the structure, its surrounding media, and the explosion bubble need to be considered.
Evaluating the effects of generalisation approaches and DEM resolution on the extraction of terrain indices in KwaZulu Natal, South Africa

Digital elevation model (DEM) data are elemental in deriving primary topographic attributes which serve as input variables to a variety of hydrologic and geomorphologic studies. There is however still varied consensus on the effect of DEM source and resolution on the application of these topographic attributes to landscape characterisation. While elevation data for South Africa are available from several major sources and resolutions: Shuttle Radar Topographic Mission (SRTM), Earth ENV and Stellenbosch University DEM (SUDEM). Limited research has been conducted in a local context comparing the extraction of terrain attributes to high resolution Digital Terrain Data (DTM) such as LiDAR (Light Detection and Ranging) that are becoming increasing available. However, the utility of LiDAR to topographic analyses presents its own challenges in terms of operational-relevant resolution, processing demands and limited spatial coverage. There is a need to quantify the impact that generalisation approaches have on simplifying detailed DEMs and to compare the accuracy and reliability of results between high resolution and coarse resolution data on the extraction of localized topographic variables. In this regional study, we analyse the accuracy on selected local terrain attributes: elevation, slope and topographic wetness index derived from DEMs from varying sources, at different spatial resolutions and using three generalisation algorithms, namely: mean cell aggregation, nearest neighbour and hydrological corrected topo-to-raster. We show that topographic variable extraction is highly dependent on DEM source and generalisation approach and while higher resolution DEMs may represent the “true“ surface more accurately, they do not necessarily offer the best results for all extracted variables. Our results highlight the caveats of selecting DEMs not “fit-for-purpose” for topographic analysis and offer a simple yet effective solution for reconciling the selection of DEMs based on neighbourhood size resolution prior to terrain analyses and topographic feature characterization .
Survey of Water and Ammonia in Nearby Galaxies (SWAN): Resolved Ammonia Thermometry and Water and Methanol Masers in IC 342, NGC 6946, and NGC 2146

The Survey of Water and Ammonia in Nearby galaxies (SWAN) studies atomic and molecular species across the nuclei of four star-forming galaxies: NGC 253, IC 342, NGC 6946, and NGC 2146. As part of this survey, we present Karl G. Jansky Very Large Array molecular line observations of three galaxies: IC 342, NGC 6946, and NGC 2146. NGC 253 is covered in a previous paper. These galaxies were chosen to span an order of magnitude in star formation rates and to select a variety of galaxy types. We target the metastable transitions of ammonia NH3(1, 1) to (5, 5), the 22 GHz water (H2O) (616–523) transition, and the 36.1 GHz methanol (CH3OH) (4−1–30) transition. We use the NH3 metastable lines to perform thermometry of the dense molecular gas. We show evidence for uniform heating across the central kiloparsec of IC 342 with two temperature components for the molecular gas, similar to NGC 253, of 27 and 308 K, and that the dense molecular gas in NGC 2146 has a temperature <86 K. We identify two new water masers in IC 342, and one new water maser in each of NGC 6946 and NGC 2146. The two galaxies NGC 253 and NGC 2146, with the most vigorous star formation, host H2O kilomasers. Lastly, we detect the first 36 GHz CH3OH masers in IC 342 and NGC 6946. For the four external galaxies the total CH3OH luminosity in each galaxy suggests a correlation with galactic star formation rate, whereas the morphology of the emission is similar to that of HNCO, a weak shock tracer.
What Determines Cumulative Abnormal Returns? An Empirical Validation in the French Market

This paper test the factors explaining of cumulative abnormal returns. To this end, we examined a sample of 137 firms in 2007. We tested event study methodology to measure the cumulative abnormal returns. An event window spans from-10 days to 10 days. In our study, we considered an estimation period from -20 days to -10 days. For the dependent variable, and after the announcement date (date of the general meeting), we try to estimate the cumulative abnormal returns of 1 day, 2 days, 6 days and 8 days. The empirical results of the cross sectional model show that the market reacts negatively because of an increase in profitability, firm size and managerial ownership. The opposite effect is observed for leverage. However, the effect of spending on research and development is not statistically significant.
Investigating effects of oppositely related semantic stimuli on design concept creativity

We are motivated to investigate methods to increase creativity in conceptual design since creativity is essential to design success, and no other stage influences final design success as much as conceptual design. Existing work supports that design stimuli may encourage creative concept generation, but does not give details on how to systematically generate stimuli. The established relationship between language and cognition, and the systematic nature of language prompt us to examine its use as design stimuli. Language relationships such as opposition provide a systematic method of generating non-obvious semantic stimuli for design problems. In this paper, we present two experiments, a pen-and-paper and a verbal protocol study, where participants used oppositely related and similarly related word stimuli in conceptual design. We found that designers using oppositely related word stimuli developed more creative concepts. Language analysis revealed how opposite stimuli elicited designer behaviours that may encourage and support creative concept generation. Our empirical results combined with linguistic theory lead us to propose a model explaining the interactions and effects of opposite-stimulus words on concept creativity. This knowledge can be used to facilitate more creative, and ultimately, more successful design.
Mobile Agent-based Information Retrieval for Shopping

The information overload is an obstacle to the practical use of potentially useful information on the Web. The use of mobile agents in this kind of applications represents a novel approach and potentially solves most of the problems that exist in centralized client-server solutions. A mobile agent is an executing program that can migrate during execution from machine to machine in a heterogeneous network. On each machine, the agent interacts with stationary service agents and other resources to accomplish its task. Mobile agents are particularly attractive in distributed information retrieval applications. By moving to the location of an information resource, the agent can search the resource locally, eliminating the transfer of intermediate result across the network and reducing end-to-end latency. This paper presents a mobile agent application for the retrieval of distributed information in a scenario of several on-line shops. This system will be developed for Webbased distributed access to database systems.
Community and International Nutrition Psychosocial Intervention Improves the Development of Term Low-BirthWeight Infants 1

It is estimated that 11% of births in developing counties are term low-birth-weight (LBW); however, there is limited information on the development of these infants. Our objectives were to determine the effect of psychosocial intervention on the development of LBW infants and to compare term LBW and normal-birth-weight (NBW) infants. Term LBW (n 140) and NBW infants (n 94) were enrolled from the main maternity hospital in Kingston, Jamaica. The LBW infants were randomly assigned to control or intervention comprising weekly home visits from birth to 8 wk and from 7 to 24 mo of age. Development was assessed at 15 and 24 mo with the Griffiths Scales. The intervention benefited the infants’ developmental quotient (DQ, P 0.05) and performance subscale at 15 mo (P 0.02), the hand and eye (P 0.05) and performance subscales (P 0.02) at 24 mo, and home environment at 12 mo. The effect of the intervention on development was mediated in part by the improvement in the home environment. The control LBW infants had significantly lower scores than the NBW in DQ and several subscales, whereas there were no significant differences between the NBW and the LBW infants after intervention. In conclusion, term LBW was associated with developmental delays, which were reduced with psychosocial intervention. J. Nutr. 134: 1417–1423, 2004.