Search results for " truth"
showing 10 items of 111 documents
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
2019
We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to av…
Corrección: una cuestión de estilo
2009
This paper is devoted to ask if Aesthetics today can be considered in the way of Baumgarten and Kant or it can be considered like a way to produce truth and truthfulness. Opposite to the ontological truth (aletheia) and the logic truth (homoisosis) the writer, from a point of view of Aesthetics, propose considering also truth like correctness, orthotés in classical Greek and rectitudo in Latin.
On how to legitimately constrain a semantic theory
2021
Abstract Semanticists often restrict their theories by imposing constraints on the parameters that can be employed for interpreting the expressions of a language. Such constraints are based on non-logical features of actual contexts of utterance, but they often have important effects on issues that do pertain to logic, like analyticity or entailment. For example, Kaplan’s restriction to so-called “proper contexts” was required in order to count “I am here now” as valid. In this paper I argue that constraints of this kind are often posited in an arbitrary and non-consistent way, and that they yield the intended results only at the price of imposing ad hoc principles whose justification could…
The Elephant in the Machine: Proposing a New Metric of Data Reliability and its Application to a Medical Case to Assess Classification Reliability
2020
In this paper, we present and discuss a novel reliability metric to quantify the extent a ground truth, generated in multi-rater settings, as a reliable basis for the training and validation of machine learning predictive models. To define this metric, three dimensions are taken into account: agreement (that is, how much a group of raters mutually agree on a single case)
Evaluation of the registration of temporal series of contrast-enhanced perfusion magnetic resonance 3D images of the liver.
2011
The registration of 2D and 3D images is one of the key tasks in medical image processing and analysis. Accurate registration is a crucial preprocessing step for many tasks; consequently, the evaluation of its accuracy becomes necessary. Unfortunately, this is a difficult task, especially when no golden pattern (true result) is available and when the signal values may have changed between successive images to be registered. This is the case this paper deals with: we have a series of 3D images, magnetic resonance images (MRI) of the liver and adjacent areas that have to be registered. They have been taken while a contrast is diffused through the liver tissue, so intensity of each observed poi…
Diffusional Kurtosis Imaging in the Diffusion Imaging in Python Project
2021
ABSTRACTDiffusion-weighted magnetic resonance imaging (dMRI) measurements and models provide information about brain connectivity and are sensitive to the physical properties of tissue microstructure. Diffusional Kurtosis Imaging (DKI) quantifies the degree of non-Gaussian diffusion in biological tissue from dMRI. These estimates are of interest because they were shown to be more sensitive to microstructural alterations in health and diseases than measures based on the total anisotropy of diffusion which are highly confounded by tissue dispersion and fiber crossings. In this work, we implemented DKI in the Diffusion in Python (DIPY) project - a large collaborative open-source project which …
Knowledge and Mistakes
2015
This chapter is about how we attain knowledge, and how we fail to do so. I argue that a true thought counts as a piece of knowledge if and only if it has the right sort of causal history. I also argue that these so-called cognitive thoughts are the criteria of truth in the sense that they are guaranteed to be true and able to guarantee the truth of that which can be inferred from them. So I argue that there are three kinds of knowledge, namely the information conveyed by our senses, the information contained in our preconceptions and the conclusions that can be inferred from our sense-perceptions and our preconceptions. I then argue that we fail to attain knowledge if we assent to a thought…
Reliable Planar Object Pose Estimation in Light Fields From Best Subaperture Camera Pairs
2018
International audience; A light-field camera can obtain richer information about a scene than a usual camera. This property offers a lot of potential for robot vision. In this paper, we present a method for pose estimation of a planar object with a light-field camera. The light-field camera can be regarded as a set of sub-aperture cameras. Although any combination of them can theoretically be used for the pose estimation, the accuracy depends on the combination. We show that the estimated pose error can be reduced by selecting the best pair of sub-aperture cameras. We have evaluated the accuracy of our approach with real experiments using a light-field camera in front of planar targets held…
Tra ambiguità e malinteso: schermaglie di una «battaglia per l’identità» in una conversazione tra mafiosi
2015
Gli scambi comunicativi tra membri di Cosa Nostra sono regolati dalla duplice restrizione della legge del silenzio verso il mondo esterno e dall'obbligo di dire la verità all'interno del sodalizio. A tal fine, il linguaggio mafioso ricorre all’obliquità semantica che fornisce ai parlanti un ampio margine di libertà consentendo loro di non esplicitare le proprie reali intenzioni. È questa la ragione per la quale Tommaso Buscetta ha definito Cosa Nostra come "il regno dei discorsi incompleti". L'ordine del discorso mafioso si basa spesso sulla pratica di quello che Jankélévitch ha definito il "malinteso doppiamente beninteso” uno scambio che si fonda non tanto su una falsa relazione quanto su…