171 research outputs found
Simultaneous supersingular reductions of CM elliptic curves
We study the simultaneous reductions at several supersingular primes of
elliptic curves with complex multiplication. We show -- under additional
congruence assumptions on the CM order -- that the reductions are surjective
(and even become equidistributed) on the product of supersingular loci when the
discriminant of the order becomes large. This variant of the equidistribution
theorems of Duke and Cornut-Vatsal is an(other) application of the recent work
of Einsiedler and Lindenstrauss on the classification of joinings of
higher-rank diagonalizable actions.Comment: 46 pages. Revised according to the referee's comment
A collaborative demand forecasting process with event-based fuzzy judgements
Mathematical forecasting approaches can lead to reliable demand forecast in some environments by extrapolating regular patterns in time-series. However, unpredictable events that do not appear in historical data can reduce the usefulness of mathematical forecasts for demand planning purposes. Since forecasters have partial knowledge of the context and of future events, grouping and structuring the fragmented implicit knowledge, in order to be easily and fully integrated in final demand forecasts is the objective of this work. This paper presents a judgemental collaborative approach for demand forecasting in which the mathematical forecasts, considered as the basis, are adjusted by the structured and combined knowledge from different forecasters. The approach is based on the identification and classification of four types of particular events. Factors corresponding to these events are evaluated through a fuzzy inference system to ensure the coherence of the results. To validate the approach, two case studies were developed with forecasters from a plastic bag manufacturer and a distributor belonging to the food retailing industry. The results show that by structuring and combining the judgements of different forecasters to identify and assess future events, companies can experience a high improvement in demand forecast accuracy
Satisfaction des utilisateurs du dossier patient informatisé valaisan
A multidisciplinary and shared computerized
patient record (CPR) has been progressively
implemented since 2002 for all public hospitals
in the State of Valais, Switzerland. This paper
presents the results of a formal evaluation of
userâs satisfaction made during the deployment
and based on questionnaires and interviews.
According to the results, the major objectives
have been reached: 2/3 of users evaluate posi-
tively the effect of the CPR on access to patient
information as well as improvement of commu-
nication between care providers. The perform-
ance problems are clearly identified, such as
time needed to start the software. These prob-
lems govern the final adoption of the system,
although 90% of users would not get back to
paper. In conclusion, intrinsic quality of the CPR,
such as ergonomics and structure, and technical
aspects such as speed and availability are key
factors for the success of such a deployment
The Comet Interceptor Mission
Here we describe the novel, multi-point Comet Interceptor mission. It is dedicated to the exploration of a little-processed long-period comet, possibly entering the inner Solar System for the first time, or to encounter an interstellar object originating at another star. The objectives of the mission are to address the following questions: What are the surface composition, shape, morphology, and structure of the target object? What is the composition of the gas and dust in the coma, its connection to the nucleus, and the nature of its interaction with the solar wind? The mission was proposed to the European Space Agency in 2018, and formally adopted by the agency in June 2022, for launch in 2029 together with the Ariel mission. Comet Interceptor will take advantage of the opportunity presented by ESAâs F-Class call for fast, flexible, low-cost missions to which it was proposed. The call required a launch to a halo orbit around the Sun-Earth L2 point. The mission can take advantage of this placement to wait for the discovery of a suitable comet reachable with its minimum ÎV capability of 600 msâ1. Comet Interceptor will be unique in encountering and studying, at a nominal closest approach distance of 1000 km, a comet that represents a near-pristine sample of material from the formation of the Solar System. It will also add a capability that no previous cometary mission has had, which is to deploy two sub-probes â B1, provided by the Japanese space agency, JAXA, and B2 â that will follow different trajectories through the coma. While the main probe passes at a nominal 1000 km distance, probes B1 and B2 will follow different chords through the coma at distances of 850 km and 400 km, respectively. The result will be unique, simultaneous, spatially resolved information of the 3-dimensional properties of the target comet and its interaction with the space environment. We present the missionâs science background leading to these objectives, as well as an overview of the scientific instruments, mission design, and schedule
Concept et implantation dâun SystĂšme dâInformation sanitaire, unique et intĂ©grĂ©, dâun canton suisse
La gestion des systÚmes hospitaliers : état des lieux et perspectives de développement
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