Search results for "STICS"
showing 10 items of 21128 documents
Joint second-order parameter estimation for spatio-temporal log-Gaussian Cox processes
2018
We propose a new fitting method to estimate the set of second-order parameters for the class of homogeneous spatio-temporal log-Gaussian Cox point processes. With simulations, we show that the proposed minimum contrast procedure, based on the spatio-temporal pair correlation function, provides reliable estimates and we compare the results with the current available methods. Moreover, the proposed method can be used in the case of both separable and non-separable parametric specifications of the correlation function of the underlying Gaussian Random Field. We describe earthquake sequences comparing several Cox model specifications.
Weighted local second-order statistics for complex spatio-temporal point processes
2019
Spatial, temporal, and spatio-temporal point processes, and in particular Poisson processes, are stochastic processes that are largely used to describe and model the distribution of a wealth of real phenomena. When a model is fitted to a set of random points, observed in a given multidimensional space, diagnostic measures are necessary to assess the goodness-of-fit and to evaluate the ability of that model to describe the random point pattern behaviour. The main problem when dealing with residual analysis for point processes is to find a correct definition of residuals. Diagnostics of goodness-of-fit in the theory of point processes are often considered through the transformation of data in…
SEMANTIC AND CONTEXTUAL APPROACH FOR THE RECOMMENDATION OF LEARNING MODULES IN MOBILITY
2012
International audience; Many researchers argue that mobile learning is just an adaptation of e-learning on mobile technology, but far from a simple extension of e-learning, m-learning raises original issues in technological and pedagogical terms. M-learning is usually based on the consideration of a context rich on information and interactions. The challenge of m-learning is therefore, not simply to transfer on mobile content designed primarily for e-learning. This concept implies that we must rethink the entire process of the learning experience in mobility to maximize its efficiency.
Recommender system for combination of learning elements in mobile environment
2012
5 pages; International audience; The paper presents an ongoing research about the development of a new recommender system dedicated to m-learning. This system is an extension of content based recommender system proposals. It's made of three levels architecture: 1/ a domain model describing the knowledge of teaching, 2/ a user model defining learner's profile and learning's context, 3/ an adaptation model containing rules and metaheuristics, which aims at combining learning modules. Our system takes into account the spatio-temporal context of the learners, the evolution of learner's profile and the dynamic adaptation of modules during the learning process in a mobile environment. The result …
Which status for sensoric based discourses on digital social networks? Methodological reflections based on a corpus of wine descriptions in French an…
2019
International audience; [Context] The rise of digital humanities, embracing the expansion of digital speech production of western societies, imposes to reconsider the status of textual data – especially for specialized discourses (Lerat 1995, Petit 2010), for which written discourse has always been the most analyzed form of language use. Siever (2015: 85-86) has already raised the issue of the very nature of digital discourses in terms of medium, such as defined alongside the traditional oral-written-continuum (Koch & Oesterreicher 1994: 528). This led to a necessary theoretical and methodological shift giving priority to the conceptual level as embodied in the distance-proximity paradigm (…
Periodismo especializado y especialización política
2015
En este artículo se revisa la bibliografía sobre periodismo especializado y se analizan los rasgos normalmente aducidos para identificar la especialización periodística, que apuntan por lo general al contenido de los textos: la especificidad temática, el enfoque en profundidad, la metodología de investigación, el recurso a fuentes expertas, la necesidad de formación complementaria a la pro-piamente periodística, la orientación a audiencias segmentadas, el uso de géneros textuales con-cretos, o la adecuación lingüística. La aplicación de estos mismos factores a la especialización políti-ca pone de manifiesto la necesidad de cuestionar los rasgos aducidos y considerar otros criterios en el co…
Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
2013
Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO3)/polypropylene composites with 1.8-8.1 wt % doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, a…
Optical Monitoring of Microplastics Filtrated from Wastewater Sludge and Suspended in Ethanol.
2021
The abundance of microplastics (MPs) in the atmosphere, on land, and especially in water bodies is well acknowledged. In this study, we establish an optical method based on three different techniques, namely, specular reflection to probe the medium, transmission spectroscopy measurements for the detection and identification, and a speckle pattern for monitoring the sedimentation of MPs filtrated from wastewater sludge and suspended in ethanol. We used first Raman measurements to estimate the presence and types of different MPs in wastewater sludge samples. We also used microscopy to identify the shapes of the main MPs. This allowed us to create a teaching set of samples to be characterized …
Persuaziâ, manipulâciâ i religioznyj âzyk:teoretičeskij aspekt
2021
This article is an attempt at a theolinguistic description of such concepts as manipulation, persuasia, and religious language. The author focuses primarily on the theoretical aspect of the stated problem. In the first part of the work, such concepts as manipulation, persuasia and speech influence are analyzed. Their hierarchy is being organized and it is concluded that persuasia and manipulation, when considered in “pure form” is the polar form of speech influence, different in means of achieving the goal: if persuasia is an open speech influence, suggesting a deliberate choice by the recipient, speech influence with the sign “+”, then the manipulation is speech influence, often using hidd…
Spin caloric transport from density-functional theory
2019
Spin caloric transport refers to the coupling of heat with spin transport. Its applications primarily concern the generation of spin currents and control of magnetisation by temperature gradients for information technology, known by the synonym spin caloritronics. Within the framework of ab initio theory, new tools are being developed to provide an additional understanding of these phenomena in realistic materials, accounting for the complexity of the electronic structure without adjustable parameters. Here, we review this progress, summarising the principles of the density-functional-based approaches in the field and presenting a number of application highlights. Our discussion includes th…