Search results for " communication"
showing 10 items of 4937 documents
The Agr communication system provides a benefit to the populations of Listeria monocytogenes in soil
2014
International audience; In this study, we investigated whether the Agr communication system of the pathogenic bacterium Listeria monocytogenes was involved in adaptation and competitiveness in soil. Alteration of the ability to communicate, either by deletion of the gene coding the response regulator AgrA (response-negative mutant) or the signal pro-peptide AgrD (signal-negative mutant), did not affect population dynamics in soil that had been sterilized but survival was altered in biotic soil suggesting that the Agr system of L. monocytogenes was involved to face the complex soil biotic environment. This was confirmed by a set of co-incubation experiments. The fitness of the response-negat…
Accessibility of eGovernment Web Sites: Towards a Collaborative Retrofitting Approach
2010
Published version of a chapter from the book: Computers Helping People with Special Needs.The original publication is available at www.springerlink.com: http://dx.doi.org/10.1007/978-3-642-14097-6_75 Accessibility benchmarking is efficient to raise awareness and initiate competition. However, traditional benchmarking is of little avail when it comes to removing barriers from eGovernment web sites in practice. Regulations and legal enforcement may be helpful in a long-term perspective. For more rapid progress both vendors and web site maintainers are willing to take short-term action towards improvements, provided that clear advise is available. The approach of the eGovernment Monitoring pro…
La construcción de los límites a la libertad de expresión en las redes sociales
2016
La generalización de las comunicaciones electrónicas, junto a otras muchas transformaciones, ha facilitado enormemente tanto la comunicación interpersonal como la participación en el debate público a cualquier ciudadano. Como resultado, el pluralismo se ha visto indudablemente enriquecido, así como las posibilidades de recibir información y ser miembro activo de la comunidad política. Otras consecuencias de esta transformación, sin embargo, presentan algunas aristas. Así, esta ampliación del espacio público ha limitado también los espacios de estricta privacidad, incluyendo aquellos ámbitos donde históricamente la expresión de todo tipo de ideas y opiniones quedaban en la intimidad, que cad…
Structural and Static Prerequisites for the Internationalization of Small and Medium – Sized Enterprises in the Baltic States
2014
Abstract The pace and extent of internationalization of small and medium-sized enterprises (SMEs) is the result of the interaction of various factors and preconditions. This article examines one of these prerequisites - the currently established structure of SMEs in the Baltic States. The relationship between the different components of SMEs or the SMEs structure is the slowly varying parameters of the functioning of the economy. However, as an integral element of the economic system, the SME structure affects its development, including internationalization of business. Based on statistical data, the opportunities for small firms to outsource business activities as a perspective form of int…
L’euro, le bourdon et le banquier central
2016
International audience; Cet article s’interroge sur les raisons de la montée en puissance de la politique de communication des banques centrales, notamment celle de la BCE. Nous commençons par présenter les arguments mis en avant par la théorie économique standard, qui justifie à la fois l’indépendance des Banques Centrales (à l’égard du pouvoir politique) et le «gouvernement des anticipations» des agents économiques. Les thèmes de la transparence, de la crédibilité et de l’indépendance ont été associés au cours des années 1980, aboutissant à la nécessité de mettre en place des banquiers centraux «conservateurs», c’est-à-dire hostiles à l’inflation. Cette littérature a influencé les pratiqu…
Batteries for Aerospace: A Brief Review
2018
This paper presents a brief overview on batteries for aerospace application. In particular, More Electric Aircraft (MEA) and All Electric Aircraft (AEA) concepts are introduced at first, together with their main advantages and drawbacks. Subsequently, opportunities and issues related to the employment of batteries on aircrafts are presented and briefly discussed. Reference is then made to aircraft power system architectures and battery technologies, as well as on the state-of-the-art of battery management systems, state-of-charge and state-of-health estimations, and thermal management.
Design and Implementation of an Ultra-Low Power Wake-up Radio for Wireless IoT Devices
2018
In this paper, we present the design and prototype implementation of an ultra-low power wake-up radio for wireless IoT devices. The prototyped wake-up radio consumes only 580nA from 3V power supply, covers distance range of up to 55 meters and achieves a sensitivity of -49.5dBm. This wakeup radio module can easily be integrated into wireless IoT devices and thereby reducing the overall power consumption of the battery powered and energy harvesting based devices. The prolonged life time of the devices can reduce the overall costs when deployed in large scale.
VentQsys: Low-cost open IoT system for CO2 monitoring in classrooms
2021
AbstractIn educational context, a source of nuisance for students is carbon dioxide ($$CO_2$$ C O 2 ) concentration due to closed rooms and lack of ventilation or circulatory air. Also, in the pandemic context, ventilation in indoor environments has been proven as a good tool to control the COVID-19 infections. In this work, it is presented a low cost IoT-based open-hardware and open-software monitoring system to control ventilation, by measuring carbon dioxide ($$CO_2$$ C O 2 ), temperature and relative humidity. This system provides also support for automatic updating, auto-self calibration and adds some Cloud and Edge offloading of computational features for mapping functionalities. From…
Li-ion Battery Modeling and State of Charge Estimation Method Including the Hysteresis Effect
2019
In this paper, a new approach to modeling the hysteresis phenomenon of the open circuit voltage (OCV) of lithium-ion batteries and estimating the battery state of charge (SoC) is presented. A characterization procedure is proposed to identify the battery model parameters, in particular, those related to the hysteresis phenomenon and the transition between charging and discharging conditions. A linearization method is used to obtain a suitable trade-off between the model accuracy and a low computational cost, in order to allow the implementation of SoC estimation on common hardware platforms. The proposed characterization procedure and the model effectiveness for SoC estimation are experime…
Efficiency optimization in bi-directional inductive power transfer systems
2015
Inductive Power Transfer (IPT) allows to wirelessly supply electronic devices. Thus, it is a very smart technique of battery charging for electric vehicles. In a parking area scenario, IPT is a proper method aiming at the energy transfer from the vehicle battery to the electric grid too. Bi-Directional Inductive Power Transfer (BDIPT) Systems are an attractive solution for the automotive market. Due to the great relevance of the energy saving problem, the goal of an efficiency maximization is researched by the energy market. In this paper, an in-depth investigation of the power efficiency in BDIPT systems is carried out, aiming at the optimum efficiency.