Alien Registration- De Lamotte, Antonia D. (Saint Agatha, Aroostook County)

https://digitalmaine.com/alien_docs/33221/thumbnail.jp

End-to-end QoE optimization through overlay network deployment

In this paper an overlay network for end-to-end QoE management is presented. The goal of this infrastructure is QoE optimization by routing around failures in the IP network and optimizing the bandwidth usage on the last mile to the client. The overlay network consists of components that are located both in the core and at the edge of the network. A number of overlay servers perform end-to-end QoS monitoring and maintain an overlay topology, allowing them to route around link failures and congestion. Overlay access components situated at the edge of the network are responsible for determining whether packets are sent to the overlay network, while proxy components manage the bandwidth on the last mile. This paper gives a detailed overview of the end-to-end architecture together with representative experimental results which comprehensively demonstrate the overlay network's ability to optimize the QoE

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An eco-friendly hybrid urban computing network combining community-based wireless LAN access and wireless sensor networking

Computer-enhanced smart environments, distributed environmental monitoring, wireless communication, energy conservation and sustainable technologies, ubiquitous access to Internet-located data and services, user mobility and innovation as a tool for service differentiation are all significant contemporary research subjects and societal developments. This position paper presents the design of a hybrid municipal network infrastructure that, to a lesser or greater degree, incorporates aspects from each of these topics by integrating a community-based Wi-Fi access network with Wireless Sensor Network (WSN) functionality. The former component provides free wireless Internet connectivity by harvesting the Internet subscriptions of city inhabitants. To minimize session interruptions for mobile clients, this subsystem incorporates technology that achieves (near-)seamless handover between Wi-Fi access points. The WSN component on the other hand renders it feasible to sense physical properties and to realize the Internet of Things (IoT) paradigm. This in turn scaffolds the development of value-added end-user applications that are consumable through the community-powered access network. The WSN subsystem invests substantially in ecological considerations by means of a green distributed reasoning framework and sensor middleware that collaboratively aim to minimize the network's global energy consumption. Via the discussion of two illustrative applications that are currently being developed as part of a concrete smart city deployment, we offer a taste of the myriad of innovative digital services in an extensive spectrum of application domains that is unlocked by the proposed platform

Interactive airline fleet assignment model

Cover titleSeries statement hand-written on coverMay 1981Includes bibliographical references (p. 105-108)This thesis investigates the Airline Fleet Assignment models which have been designed during the past 10 years within MIT's Flight Transportation Laboratory. Emphasis is placed on developing an interactive computer system, called IFA/1, which simplifies the use of fleet assignment models and improves the insertion or modification of necessary data. The first section gives a general review of the mathematical models used for vehicle planning in air transportation, with special attention given to the Airline Fleet Assignment and Fleet Planning problem. The techniques used to solve these problems are discussed, and one model of particular interest, the FA4 model, is introduced. The second part describes how FA4 is used in practice and points out some of its major deficiencies. An improvement is proposed through the means of an interactive computer package available at the Flight Transportation Laboratory. Future modifications to this interactive system are also discussed. Finally, an alternative solution is suggested to one of the theoretical problems which underlies the Fleet Assignment model: the "phantom frequency problem". This issue is discussed and a new set of equations is proposed which improves the efficiency of the model

The impact of baffles and probes on flow and power consumption in single- use bioreactors

In upstream processing single-use bioreactors (SUBs) are used in for the production of 66% of biopharmaceutical products due to high flexibility and reduction of time to market1. Even though SUBs offer economic feasibility for cell culture, there are limitations on the selection of optimal scale-up criteria which ensure that the cultivation process is adequately translated to larger scales. Therefore, rigorous hydrodynamic analysis is essential in novel SUBs, for the understanding of flow dynamics and energy consumption characteristics and secures that the equivalency of critical quality attributes (CQAs) across different scales is met2. To date scaling procedures have been mainly limited to pilot and larger scale systems but this must be extended and tested to smaller scales, where probes and baffle dimensions relative to the reactor size can greatly affect the overall flow and mixing performance. In this framework, a systematic characterisation of engineering features in small-scale SUBs is particularly important for the development of valid scale-down models (SDMs) and a thorough understanding of the flow field at that scale is essential to evaluate the way critical design parameters affect the fluid dynamics, assisting in the optimisation of mixing and cell growth3. The aim of this work is to assess the flow patterns and power consumption in different stirred tank bioreactor geometries, with working volumes ranging between 200 mL - 1L, actively used in mammalian and stem-cell cultures, in fed-batch and perfusion modes. The bioreactors are equipped with different baffle and probe sizes focusing on the optimisation of probe design. For fluid flow experiments the Reynolds number ranges from Re=2500-7000 with mixtures of water and glycerol being the working fluids. Flow hydrodynamics and power consumption have been characterised via computational fluid dynamics (CFD) and validated experimentally via Particle Image Velocimetry (PIV). The impact of design parameters is assessed with particular focus on baffle and probe number and size in order to evaluate the dependency of bioreactor hydrodynamics and power consumption on key geometrical features. Preliminary results indicate that the presence of probes highly impact the flow dynamics and impeller power number with the latter acting equivalently to baffles. The computational and experimental analysis of the flow dynamics in the current work, verifies the accuracy of CFD simulations and emphasises that the investigation of small-scale reactors is essential, highlighting the sensitivity of mixing features on bioreactor design parameters

Détermination structurale de la cassiicoline, la toxine glycosylée de Corynespora cassiicola

Corynespora cassiicola est un champignon phytopathogène nécrotrophe capable d'infecter plus de 70 plantes hôtes, parmi lesquelles, la tomate, le concombre, le coton, le soja ou l'hévéa. Dans le cas de l'hévéa, la pathologie induite par C.!cassiicola se manifeste par des défoliations massives pouvant conduire à la mort de l'arbre. Cette infection est en constante progression dans toutes les zones de production