746 research outputs found
First Scarab Host for \u3ci\u3eStrongygaster Triangulifer\u3c/i\u3e (Diptera: Tachinidae): the Dung Beetle, \u3ci\u3eAphodius Fimetarius\u3c/i\u3e (Coleoptera: Scarabaeidae)
We report Strongygaster (=Hyalomyodes ) triangulifer as a solitary primary parasite of the adult introduced dung beetle, Aphodius fimetarius. This is the first record of this tachinid fly parastizing scarab
Alarm Pheromone in a Gregarious Poduromorph Collembolan (Collembola: Hypogastruridae)
We report an alarm pheromone in the gregarious poduromorph collembolan, Hypogastrura pannosa. Cuticular rupture results in emission of a rapidly vaporizing hexane-soluble material with an active space diameter of ca. 1 cm. Conspecifics encountering the vapor front respond with stereotypic aversion and dispersal behaviors. This is the first report on the presence of an alarm pheromone in the order Collembola
Correction: The association between human herpesvirus infections and stroke: a systematic review protocol
The Potential of Erin Brokovitch to Introduce Organizaitonal Behavior Topics
Real organizational behavior is rich, and messy, and emotional, and at times painful, but at other times immensely rewarding. The movie, Erin Brockovich, captures this richness and provides an exciting means to introduce a variety of individual or micro- organizational behavior concepts (such as perception, personality, and motivation) typically covered at the beginning of the Organizational Behavior course. In this paper, we describe the use of the film, including a takehome viewing assignment, an in-class assignment, a description of clips and comments for in-class use, and suggestions for the types of issues to discuss in relation to the major topics and in relation to other potentially relevant areas. The richness of this film and the issues raised also provide the potential for more critical analyses of management and organizational practices
Paquet R pour l'estimation d'un mélange de lois de Student multivariées à échelles multiples
National audienceL'utilisation d'un modèle de mélange de lois est une approche statistique classique en classification non-supervisée. Un mélange fréquemment utilisé pour sa simplicité est le mélange gaussien. Cependant, un tel modèle est sensible aux données atypiques. Pour remédier à cela, nous présentons ici le mélange de lois de Student multivariées à échelles multiples, que nous sommes en train d'incorporer au sein d'un paquet R. Ces lois peuvent gérer des queues de lourdeurs différentes selon les directions alors que les lois gaussiennes et les lois de Student multivariées standards sont contraintes à être symétriques
TriadNet: Sampling-free predictive intervals for lesional volume in 3D brain MR images
The volume of a brain lesion (e.g. infarct or tumor) is a powerful indicator
of patient prognosis and can be used to guide the therapeutic strategy.
Lesional volume estimation is usually performed by segmentation with deep
convolutional neural networks (CNN), currently the state-of-the-art approach.
However, to date, few work has been done to equip volume segmentation tools
with adequate quantitative predictive intervals, which can hinder their
usefulness and acceptation in clinical practice. In this work, we propose
TriadNet, a segmentation approach relying on a multi-head CNN architecture,
which provides both the lesion volumes and the associated predictive intervals
simultaneously, in less than a second. We demonstrate its superiority over
other solutions on BraTS 2021, a large-scale MRI glioblastoma image database.Comment: Accepted for presentation at the Workshop on Uncertainty for Safe
Utilization of Machine Learning in Medical Imaging (UNSURE) at MICCAI 202
Multi-layer Aggregation as a key to feature-based OOD detection
Deep Learning models are easily disturbed by variations in the input images
that were not observed during the training stage, resulting in unpredictable
predictions. Detecting such Out-of-Distribution (OOD) images is particularly
crucial in the context of medical image analysis, where the range of possible
abnormalities is extremely wide. Recently, a new category of methods has
emerged, based on the analysis of the intermediate features of a trained model.
These methods can be divided into 2 groups: single-layer methods that consider
the feature map obtained at a fixed, carefully chosen layer, and multi-layer
methods that consider the ensemble of the feature maps generated by the model.
While promising, a proper comparison of these algorithms is still lacking. In
this work, we compared various feature-based OOD detection methods on a large
spectra of OOD (20 types), representing approximately 7800 3D MRIs. Our
experiments shed the light on two phenomenons. First, multi-layer methods
consistently outperform single-layer approaches, which tend to have
inconsistent behaviour depending on the type of anomaly. Second, the OOD
detection performance highly depends on the architecture of the underlying
neural network.Comment: Accepted for presentation at the Workshop on Uncertainty for Safe
Utilization of Machine Learning in Medical Imaging (UNSURE) at MICCAI 202
A deterministic detector for vector vortex states
Encoding information in high-dimensional degrees of freedom of photons has led to new avenues in various quantum protocols such as communication and information processing. Yet to fully benefit from the increase in dimension requires a deterministic detection system, e.g., to reduce dimension dependent photon loss in quantum key distribution. Recently, there has been a growing interest in using vector vortex modes, spatial modes of light with entangled degrees of freedom, as a basis for encoding information. However, there is at present no method to detect these non-separable states in a deterministic manner, negating the benefit of the larger state space. Here we present a method to deterministically detect single photon states in a four dimensional space spanned by vector vortex modes with entangled polarisation and orbital angular momentum degrees of freedom. We demonstrate our detection system with vector vortex modes from the |[Formula: see text]| = 1 and |[Formula: see text]| = 10 subspaces using classical and weak coherent states and find excellent detection fidelities for both pure and superposition vector states. This work opens the possibility to increase the dimensionality of the state-space used for encoding information while maintaining deterministic detection and will be invaluable for long distance classical and quantum communication
- …