Red de sensores inalámbricos multisalto para sistemas domóticos de bajo costo y área extendida

Wireless sensor networks have a wide range of applications and many pending challenges, especially those related to the evolution of digital electronics, bandwidth, reduction of implementation costs, network coverage and processing capacity. This document proposes a configuration of multi-hop wireless network oriented to intelligent domotic installations, based on 32-bit microcontrollers and low cost wireless communication modules, which allows to have complete coverage between the devices of the home automation system with a reduced loss of data, improvement in the processing capacity, adaptability and scalability in the nodes. The evaluation of network performance considers the following metrics: response time, network reach, scalability and precision. The experimental results determined a successful adaptation of the AODV multi-hop protocol, allowing sufficient coverage for a single-family house, at transmission speeds of 250Kbps, which guarantees the integrity and security of the data.Las redes de sensores inalámbricos disponen de un campo muy amplio de aplicaciones y aún muchos desafíos pendientes, especialmente aquellos relacionados con la evolución de la electrónica digital, ancho de banda, reducción de costos de implementación, cobertura de red y capacidad de procesamiento. Este documento propone una configuración de red inalámbrica multisalto orientada a instalaciones domóticas inteligentes, basadas en microcontroladores de 32 bits y módulos de comunicación inalámbrica de bajo costo, que permita tener cobertura completa entre los dispositivos del sistema domótico con una reducida pérdida de datos, mejora en la capacidad de procesamiento, adaptabilidad y escalabilidad en los nodos sensores. La evaluación del desempeño de la red considera las siguientes métricas: tiempo de respuesta, alcance de red, escalabilidad y precisión. Los resultados experimentales determinaron una adaptación exitosa del protocolo multisalto AODV, permitiendo una cobertura suficiente para una vivienda unifamiliar, a una velocidad de transmisión de 250Kbps, que garantiza la integridad y seguridad de los datos

Network of multi-hop wireless sensors for low cost and extended area home automation systems

[EN] Wireless sensor networks have a wide range of applications and many pending challenges, especially those related to the evolution of digital electronics, bandwidth, reduction of implementation costs, network coverage and processing capacity. This document proposes a configuration of multi-hop wireless network oriented to intelligent domotic installations, based on 32-bit microcontrollers and low cost wireless communication modules, which allows to have complete coverage between the devices of the home automation system with a reduced loss of data, improvement in the processing capacity, adaptability and scalability in the nodes. The evaluation of network performance considers the following metrics: response time, network reach, scalability and precision. The experimental results determined a successful adaptation of the AODV multi-hop protocol, allowing sufficient coverage for a single-family house, at transmission speeds of 250Kbps, which guarantees the integrity and security of the data.[ES] Las redes de sensores inalámbricos disponen de un campo muy amplio de aplicaciones y aún muchos desafíos pendientes, especialmente aquellos relacionados con la evolución de la electrónica digital, ancho de banda, reducción de costos de implementación, cobertura de red y capacidad de procesamiento. Este documento propone una configuración de red inalámbrica multisalto orientada a instalaciones domóticas inteligentes, basadas en microcontroladores de 32 bits y módulos de comunicación inalámbrica de bajo costo, que permita tener cobertura completa entre los dispositivos del sistema domótico con una reducida pérdida de datos, mejora en la capacidad de procesamiento, adaptabilidad y escalabilidad en los nodos. La evaluación del desempeño de la red considera las siguientes métricas: tiempo de respuesta, alcance de red, escalabilidad y precisión. Los resultados experimentales determinaron una adaptación exitosa del protocolo multisalto AODV, permitiendo una cobertura suficiente para una vivienda unifamiliar, a una velocidad de transmisión de 250Kbps, que garantiza la integridad y seguridad de los datos.Mendoza, E.; Fuentes, P.; Benítez, I.; Reina, D.; Núñez, J. (2020). Red de sensores inalámbricos multisalto para sistemas domóticos de bajo costo y área extendida. Revista Iberoamericana de Automática e Informática industrial. 17(4):412-423. https://doi.org/10.4995/riai.2020.12301OJS412423174Ahmad, A., Roslan, M. F., & Amira, A., 2017. Throughput, latency and cost comparisons of microcontroller-based implementations of wireless sensor network (WSN) in high jump sports. In AIP Conference Proceedings (Vol. 1883, No. 1, p. 020010). 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Distributed Load Testing by Modeling and Simulating User Behavior

Modern human-machine systems such as microservices rely upon agile engineering practices which require changes to be tested and released more frequently than classically engineered systems. A critical step in the testing of such systems is the generation of realistic workloads or load testing. Generated workload emulates the expected behaviors of users and machines within a system under test in order to find potentially unknown failure states. Typical testing tools rely on static testing artifacts to generate realistic workload conditions. Such artifacts can be cumbersome and costly to maintain; however, even model-based alternatives can prevent adaptation to changes in a system or its usage. Lack of adaptation can prevent the integration of load testing into system quality assurance, leading to an incomplete evaluation of system quality. The goal of this research is to improve the state of software engineering by addressing open challenges in load testing of human-machine systems with a novel process that a) models and classifies user behavior from streaming and aggregated log data, b) adapts to changes in system and user behavior, and c) generates distributed workload by realistically simulating user behavior. This research contributes a Learning, Online, Distributed Engine for Simulation and Testing based on the Operational Norms of Entities within a system (LODESTONE): a novel process to distributed load testing by modeling and simulating user behavior. We specify LODESTONE within the context of a human-machine system to illustrate distributed adaptation and execution in load testing processes. LODESTONE uses log data to generate and update user behavior models, cluster them into similar behavior profiles, and instantiate distributed workload on software systems. We analyze user behavioral data having differing characteristics to replicate human-machine interactions in a modern microservice environment. We discuss tools, algorithms, software design, and implementation in two different computational environments: client-server and cloud-based microservices. We illustrate the advantages of LODESTONE through a qualitative comparison of key feature parameters and experimentation based on shared data and models. LODESTONE continuously adapts to changes in the system to be tested which allows for the integration of load testing into the quality assurance process for cloud-based microservices

Competition and collaboration in supply chains: an agent-based modelling approach

Competition has been considered as an effective means to improve business and economic competitiveness. However, competition in supply chain management (SCM) can be viewed as a source of uncertainty. Most recommended collaboration strategies in SCM literature tend to avoid the emergence of competition inside the supply chain, but, in reality, these strategies do not lead all supply chains to success. In addition, from strategic management perspective, these collaboration strategies are not believed to encourage firms to improve their performance. Both competition and collaboration are critical issues in achieving business success, but the effect of both factors on the market has not been explored concurrently in the literature. The complexity of this issue should be investigated using a comprehensive perspective, and it is hard to undertake by using an empirical approach. [Continues.

Une approche logicielle du traitement de la dyslexie : étude de modèles et applications

Neuropsychological disorders are widespread and generate real public health problems. In particular in our modern society, where written communication is ubiquitous, dyslexia can be extremely disabling. Nevertheless we can note that the diagnosis and remediation of this pathology are fastidious and lack of standardization. Unfortunately it seems inherent to the clinical characterization of dyslexia by exclusion, to the multitude of different practitioners involved in such treatment and to the lack of objectivity of some existing methods. In this respect, we decided to investigate the possibilities offered by modern computing to overcome these barriers. Indeed we have assumed that the democratization of computer systems and their computing power could make of them a perfect tool to alleviate the difficulties encountered in the treatment of dyslexia. This research has led us to study the techniques software as well as hardware, which can conduct to the development of an inexpensive and scalable system able to attend a beneficial and progressive changing of practices in this pathology field. With this project we put ourselves definitely in an innovative stream serving quality of care and aid provided to people with disabilities. Our work has been identifying different improvement areas that the use of computers enables. Then each of these areas could then be the subject of extensive research, modeling and prototype developments. We also considered the methodology for designing this kind of system as a whole. In particular our thoughts and these accomplishments have allowed us to define a software framework suitable for implementing a software platform that we called the PAMMA. This platform should theoretically have access to all the tools required for the flexible and efficient development of medical applications integrating business processes. In this way it is expected that this system allows the development of applications for caring dyslexic patients thus leading to a faster and more accurate diagnosis and a more appropriate and effective remediation. Of our innovation efforts emerge encouraging perspectives. However such initiatives can only be achieved within multidisciplinary collaborations with many functional, technical and financial means. Creating such a consortium seems to be the next required step to get a funding necessary for realizing a first functional prototype of the PAMMA, as well as its first applications. Some clinical studies may be conducted to prove undoubtedly the effectiveness of such an approach for treating dyslexia and eventually other neuropsychological disorders.Les troubles neuropsychologiques sont très répandus et posent de réels problèmes de santé publique. En particulier, dans notre société moderne où la communication écrite est omniprésente, la dyslexie peut s’avérer excessivement handicapante. On remarque néanmoins que le diagnostic et la remédiation de cette pathologie restent délicats et manquent d’uniformisation. Ceci semble malheureusement inhérent à la caractérisation clinique par exclusion de la dyslexie, à la multitude de praticiens différents impliqués dans une telle prise en charge ainsi qu’au manque d’objectivité de certaines méthodes existantes. A ce titre, nous avons décidé d’investiguer les possibilités offertes par l’informatique actuelle pour surmonter ces barrières. Effectivement, nous avons supposé que la démocratisation des systèmes informatiques et leur puissance de calcul pourraient en faire un outil de choix pour pallier les difficultés rencontrées lors de la prise en charge de la dyslexie. Cette recherche nous a ainsi mené à étudier les techniques, aussi bien logicielles que matérielles, pouvant conduire au développement d’un système bon marché et évolutif qui serait capable d’assister un changement bénéfique et progressif des pratiques qui entourent cette pathologie. Avec ce projet, nous nous plaçons définitivement dans un courant innovant au service de la qualité des soins et des aides apportées aux personnes souffrant d’un handicap. Notre travail a ainsi consisté à identifier différents axes d’amélioration que l’utilisation de l’outil informatique rend possible. Chacun de ces axes a alors pu faire l’objet de recherches exhaustives, de modélisations et de développements de prototypes. Nous avons également réfléchi à la méthodologie à mettre en œuvre pour concevoir un tel système dans sa globalité. En particulier, nos réflexions et ces différents accomplissements nous ont permis de définir un framework logiciel propice à l’implémentation d’une plate-forme logicielle que nous avons appelée la PAMMA. Cette plate-forme devrait théoriquement pouvoir disposer de tous les outils permettant le développement souple et efficace d’applications médicales intégrant des processus métiers. Il est ainsi attendu de ce système qu’il permette le développement d’applications, pour la prise en charges des patients dyslexiques, conduisant à un diagnostic plus rapide et plus précis ainsi qu’à une remédiation plus adaptée et plus efficace. De notre effort d’innovation ressortent des perspectives encourageantes. Cependant, ce type d’initiative ne peut se concrétiser qu’autour de collaborations pluridisciplinaires disposant de nombreux moyens fonctionnels, techniques et financiers. La constitution d’un tel consortium semble donc être la prochaine étape nécessaire à l’obtention des financements pour réaliser un premier prototype fonctionnel de la PAMMA, ainsi que de premières applications. Des études cliniques pourront être alors menées pour prouver indubitablement l’efficacité d’une telle approche dans le cadre de la prise en charge de la dyslexie, ainsi qu’éventuellement d’autres troubles neuropsychologiques