Search results for "Vision"
showing 10 items of 5066 documents
Stability of stochastic nonlinear systems with state-dependent switching
2013
In this paper, the problem of stability on stochastic systems with state-dependent switching is investigated. To analyze properties of the switched system by means of Itô’s formula and Dynkin’s formula, it is critical to show switching instants being stopping times. When the given active-region set can be replaced by its interior, the local solution of the switched system is constructed by defining a series of stopping times as switching instants, and the criteria on global existence and stability of solution are presented by Lyapunov approach. For the case where the active-region set can not be replaced by its interior, the switched systems do not necessarily have solutions, thereby quasi-…
La storia agli storici
2012
Gli atti del seminario tenutosi nell’aula magna della Facoltà di Lettere e Filosofia nell’ormai lontano novembre 2000, che oggi si pubblicano, forse sarebbero scarsamente comprensibili senza l’ampia e articolata introduzione di Fabrizio D’Avenia, il quale, con una analisi paziente e molto ben documentata, è riuscito a ricostruire felicemente il contesto politico e storiografico in cui il dibattito di allora deve necessariamente collocarsi. Essa costituisce quindi una premessa indispensabile alla successiva lettura degli interventi. L’introduzione di D’Avenia, tuttavia, non si limita soltanto alla puntuale verifica storiografica delle diverse posizioni e alla corretta focalizzazione dei nodi…
La storia, gli storici
2012
Questo volumetto raccoglie gli atti di un dibattito svoltosi presso la Facoltà di Lettere e Filosofia di Palermo il 29 novembre 2000. Il tema della discussione, “la storia, gli storici”, riguardava i manuali di storia in uso nelle scuole superiori, con l’intervento non solo di professori universitari di storia, ma anche di docenti di alcuni licei palermitani, in un confronto – tanto interessante quanto raro – tra mondo universitario e mondo scolastico. La scelta del tema non era ovviamente casuale ma rispondeva a un’esigenza ben precisa: discutere il contenuto di due mozioni presentate rispettivamente presso il Consiglio regionale del Lazio e, pochi giorni dopo, presso l’Assemblea Regionale…
STRADE DI SICILIA. SCATTI DA GOOGLE STREET VIEW RIVISITATI/
2013
STRADE DI SICILIA. SCATTI DA GOOGLE STREET VIEW RIVISITATI/
Primitives extraction based on structured-light images
2013
International audience; Geometric attributes such as curvature or surface orientation are additional information of the 3D points obtained after the scanning of an object. In the classic 3D chain, characterized by a sequential structure, these information are determined from the dense point cloud (from a 3D scanner). Then, they are used to reduce the amount of information and allows to obtain a simplified model. In this paper, we investigate the possibility to extract some geometric attributes, directly from 2D images obtained by the camera of a structured-light system.
Towards a Guidance System to Aid in the Dosimetry Calculation of Intraoperative Electron Radiation Therapy
2015
In Intraoperative Electron Radiation Therapy (IOERT), the lack of specific planning tools limits its applicability, the need for accurate dosimetry estimation and application during the therapy being the most critical. Recently, some works have been presented that try to overcome some of the limitations for establishing planning tools, though still an accurate guidance system that tracks, in real-time, the applicator and the patient is needed. In these surgical environments, the acquisition of an accurate 3D shape of the patient’s tumor bed in real-time is of high interest, as current systems make use of a 3D model acquired before the treatment. In this paper, an optical-based system is pre…
Teaching is a Story Whose First Pages Matters – Four Type Narratives From The Beginning of a Teaching Career.
2022
From a broad perspective, the entire time spent in teacher training can be characterized as a period of professional growth. Specific professional growth and development are realized when the students enter the advanced stage of master's studies to independently practise their profession in their own class of pupils. The uncertainty of a novice teacher and, on the other hand, the ‘burden of competence’ gained from teacher training make this induction phase very sensitive and critical, as all the competencies they have obtained during teacher training should culminate in this specific phase. The development of a student into an independent teacher is a growth story in which each person's ide…
Reverse Catmull-Clark Subdivision
2006
Reverse subdivision consists in constructing a coarse mesh of a model from a finer mesh of this same model. In this paper, we give formulas for reverse Catmull-Clark subdivision. These formulas allow the constructing of a coarse mesh for almost all meshes. The condition for being able to apply these formulas is that the mesh to be reversed must be generated by the subdivision of a coarse mesh. Except for this condition, the mesh can be arbitrary. Vertices can be regular or extraordinary and the mesh itself can be arbitrary (triangular, quadrilateral…).
Ositusmetodit reaaliaikaisessa renderöinnissä
2017
Tietokonegrafiikka ja siihen liittyvät menetelmät ovat nopeasti kehittyvä tutkimuksen ala. Tämän tutkimuksen tavoitteena on pohtia eri ositusmenetelmien toimintaa reaaliaikaisessa käytössä sekä vertailla näitä menetelmiä. Nykyaikaiselle käytölle tehokkaimmaksi osoittautui kolmesta tutkitusta menetelmästä tuorein (Brainerd ym. 2016). Tulevassa tutkimuksessa laitteistointegraatioon keskittyminen voisi tuoda ositusmenetelmät nopeammin kuluttajien saataville. Computergraphicsanditsmethodsarearapidlydevelopingfieldinresearch.The purpose of this study is to discuss and compare the functionality of several subdivision methods in real-time use. The latest of the three studied methods turned out to be…
Distinct microbial populations are tightly linked to the profile of dissolved iron in the methanic sediments of the Helgoland mud area, North Sea
2015
Iron reduction in subseafloor sulfate-depleted and methane-rich marine sediments is currently a subject of interest in subsurface geomicrobiology. While iron reduction and microorganisms involved have been well studied in marine surface sediments, little is known about microorganisms responsible for iron reduction in deep methanic sediments. Here, we used quantitative PCR-based 16S rRNA gene copy numbers and pyrosequencing-based relative abundances of bacteria and archaea to investigate covariance between distinct microbial populations and specific geochemical profiles in the top 5 m of sediment cores from the Helgoland mud area, North Sea. We found that gene copy numbers of bacteria and ar…