Study of Repair Protocols for Live Video Streaming Distributed Systems

International audience—We study distributed systems for live video streaming. These systems can be of two types: structured and un-structured. In an unstructured system, the diffusion is done opportunistically. The advantage is that it handles churn, that is the arrival and departure of users, which is very high in live streaming systems, in a smooth way. On the opposite, in a structured system, the diffusion of the video is done using explicit diffusion trees. The advantage is that the diffusion is very efficient, but the structure is broken by the churn. In this paper, we propose simple distributed repair protocols to maintain, under churn, the diffusion tree of a structured streaming system. We study these protocols using formal analysis and simulation. In particular, we provide an estimation of the system metrics, bandwidth usage, delay, or number of interruptions of the streaming. Our work shows that structured streaming systems can be efficient and resistant to churn

Bandpass delta sigma optimization using parameter identification

International audienceIn this paper, a new method to optimize the noise shape of a bandpass delta sigma (BPDS) modulator for a digital transmitter is presented. The optimal coefficients of BPDS structure are obtained by minimization of a quadratic criterion based on prediction error. To demonstrate the effectiveness of this approach, simulated results for a 6th order BPDS structure are presented

Programa de intervención en atención temprana: niño prematuro

El desarrollo infantil es la etapa más importante de la vida del niño, ya que adquiere nuevas habilidades y evolucionan las áreas cognitiva, física, emocional, moral, social y el lenguaje. Los programas de estimulación temprana facilitan el desarrollo global del niño, ayudando a alcanzar logros significativos que varían dependiendo de su fase de desarrollo. Los objetivos de este trabajo fueron; posibilitar la adquisición del juego simbólico e iniciativa del juego, facilitar la adquisición del gateo que conlleva una mayor autonomía del niño y favorecer la precisión bimanual para el uso de objetos. Se trabajó con un paciente de 2 años, con dificultades en el área de desarrollo psicomotor y cognitivo, concretamente a nivel de psicomotricidad gruesa y psicomotricidad fina. Los resultados indican una mejora en estas áreas de desarrollo, en concreto en los aspectos de gateo, precisión bimanual y juego simbólico. El tratamiento en estimulación basado en el Modelo de Ocupación Humana es efectivo en la intervención con pacientes prematuros con este tipo de afectación

Perspective on Digital Technologies and Optimization Used to Improve the Management of Natural Resources

Recent advances in digital technologies and optimization methodologies are revolutionizing how we monitor, allocate, and conserve vital natural assets such as water, energy, and arable land. This review presents a comprehensive perspective on the transformative role of digital innovations—including artificial intelligence (AI), geographic information systems (GIS), and blockchain—in enhancing the visibility, efficiency, and transparency of resource management systems. It also highlights the mathematical and algorithmic frameworks, such as Pinch Analysis or optimization approaches, that underpin modern techniques used to address complex resource allocation problems. The paper further discusses emerging directions to underscore the need for interdisciplinary collaboration and policy alignment. This article aims to inform stakeholders and researchers on the integrative potential of technology and optimization approaches in driving resilient, data-driven, and equitable resource management practices

D’un lecteur à l’autre : emprunts et circulation de manuscrits à Rouen à la fin du Moyen Âge

Les sources concernant la circulation des livres à Rouen aux XIVe et XVe siècles sont particulièrement riches et, pour certaines d’entre elles, attendent encore d’être exploitées, notamment du point de vue de la transmission des textes.Au travers du fragment de « registre de prêt » de Saint-Ouen (1372-1378) et des registres de délibérations conservés pour le chapitre de Notre-Dame de Rouen (1367-1493), il est proposé, pour ces deux bibliothèques, de se pencher principalement sur le prêt, mais aussi sur d’autres formes de circulation des livres (ventes, échanges…, à l’exclusion des legs et des dons) : quelles étaient les modalités du prêt des manuscrits ? qui bénéficiait de cette circulation des livres ? quels textes circulaient à Rouen à la fin du Moyen Âge ? Un des derniers points, qui est seulement esquissé, concerne le vocabulaire utilisé dans les opérations de prêt.The sources for the circulation of books in Rouen during the fourteenth and fifteenth centuries are particularly rich, and for some of them are still waiting to be exploited, especially in terms of the transmission of texts.From a fragment of a “loan register” from Saint-Ouen (1372-1378) and the records of deliberations conserved for the chapter of Notre-Dame of Rouen (1367-1493), it is proposed here, for these two libraries, to analyse principally loans, but also other forms of book circulation (sales, exchanges…, excluding bequests and donations): what were the terms of manuscript loan? who benefited from the circulation of books? which texts circulated in Rouen at the end of the Middle Ages? One of the last points, which is only hardly evoked here, concerns the vocabulary used during the lending process

Load-pull circles analysis method for aplying the outphasing technique in power amplifier design

This paper presents a simple way of analyzing the suitability of a power amplifier for its use in an outphasing system. Simple steps are presented, allowing the designer to decide in advance if the outphasing technique will improve the efficiency versus back-off characteristic of the amplifier. For validating the method, an outphasing system for a Class AB amplifier has been designed, simulated and measured. In addition, a Class D amplifier has been also simulated to make a comparison of the results

Integrated Approach of Intelligent Asset Maintenance and Resource Conservation for Circular Economy

Rychlá globální industrializace a urbanizace kladla velkou zátěž na spotřebu přírodních zdrojů. Například nedostatek vody a znečištění vody již dlouhou dobu ovlivňují lidské životy a hospodářský rozvoj a uchýlení se k čisté sladké vodě se stává důležitým problémem. Rostoucí problémy s nepravidelným zásobováním vodou a znečištěním vody vyžadují pokročilejší metodiky hodnocení vodních zdrojů, které by vedly k praktickému využívání vody a hospodaření s ní. Dalším známým problémem je akumulace plastového odpadu v této možnosti, což vyvolává znepokojivé obavy ohledně dosažení optimální sítě pro zachování zdrojů, směřující k cíli oběhového hospodářství. Koncept cirkulární ekonomiky se zaměřuje nejen na ochranu zdrojů, ale také zdůrazňuje důležitost zachování a zachování životnosti aktiv. Tato práce je zaměřena na vývoj pokročilých přístupů k ochraně zdrojů a údržbě majetku Tato práce představuje rozšířenou analýzu metod založených na Pinch při zachování materiálových zdrojů pro průmyslové místo. Hlavní rozšíření zahrnují koncepční analýzu sítě pro zachování zdrojů, která zahrnuje omezení několika kvalit, cílení a syntézu záhlaví a syntézu sítě pro zachování materiálu v rámci celého webu. Tyto metody slouží uživatelům jako grafické uživatelské rozhraní k výběru preferovaných možností návrhu a zároveň zajišťují minimální spotřebu čerstvých zdrojů. Studie také rozšiřuje začlenění různých typů zdrojů, jako je teplo a voda, do ochranné sítě. Otázky řízení, jako je řízení zdrojů, dotace a rozdělování nákladů, jsou rovněž studovány pro ekologický průmysl. S ohledem na prodloužení životnosti aktiva je do této studie začleněno dlouhodobé plánování procesu nebo průmyslového areálu pokrývajícího věk majetku, odpisy a spolehlivost. Nástroje pro integraci procesů jsou navrženy tak, aby plánovaly náklady na údržbu na časové období a plánování pracovní síly. Studie je také rozšířena o další analýzu zahrnující investice do pohotovostních jednotek a technologií pro jakýkoli proces. Kombinace výkonu aktiv s ochranou zdrojů, rámce diagnostiky chyb a prognózy se aplikuje na plánování údržby majetku Total Site/Eco-industrial park.The rapid global industrialisation and urbanisation have placed heavy burdens on natural material resources consumption. For example, water scarcity and water pollution have been affecting human lives and economic developments for a long time, and resorting to clean fresh water has been becoming an important issue. The increasing irregular water supply and water pollution issues require more advanced water resources assessment methodologies to guide practical water use and management. Another well-known issue is the plastic waste accumulation in the option, which raises an alarming concern in achieving the optimal resources conservation network, striving towards the goal of Circular Economy. The Circular Economy concept not only focuses on resources conservation but also highlights the importance of maintaining and preserving the assets’ lifetime. This thesis is focused on developing advanced approaches for resources conservation and asset maintenance This thesis presents the extended analysis of Pinch-based methods in conserving the material resources for an industrial site. The major extensions involve the conceptual analysis on the resource conservation network that involves multiple qualities constraints, headers targeting and synthesis, and Total Site material conservation network synthesis. These methods serve as the graphical user interface for the users to select the preferable design options while ensuring the fresh resources consumptions are minimal. The study also extends the incorporation of different types of resources, such as heat and water, into the conservation network. The management issues such as resources management, subsidies and cost allocations are also studied for the eco-industrial site. Considering the asset’s lifetime prolongation, the long-term planning of a process or industrial site is incorporated in this study covering the assets’ age, depreciation and reliability. Process Integration tools are proposed to plan for the maintenance cost for a time period and workforce scheduling. The study is also extended to more analysis involving standby units and technologies investment for any process. Combining asset performance with resources conservation, the fault diagnosis and prognosis framework is applied to the Total Site/Eco-industrial park asset maintenance planning.

Study of Repair Protocols for Live Video Streaming Distributed Systems

International audience—We study distributed systems for live video streaming. These systems can be of two types: structured and un-structured. In an unstructured system, the diffusion is done opportunistically. The advantage is that it handles churn, that is the arrival and departure of users, which is very high in live streaming systems, in a smooth way. On the opposite, in a structured system, the diffusion of the video is done using explicit diffusion trees. The advantage is that the diffusion is very efficient, but the structure is broken by the churn. In this paper, we propose simple distributed repair protocols to maintain, under churn, the diffusion tree of a structured streaming system. We study these protocols using formal analysis and simulation. In particular, we provide an estimation of the system metrics, bandwidth usage, delay, or number of interruptions of the streaming. Our work shows that structured streaming systems can be efficient and resistant to churn