Toward Scalable Docker-Based Emulations of Blockchain Networks

Blockchain, like any other technology, needs a strong testing methodology to support its evolution. Setting up meaningful blockchain tests is a notoriously complex task for several reasons: software is complex, large number of nodes are involved, network is non ideal, etc. Developers usually adopts small virtual laboratories or costly real devnets, based on real software. Researchers usually prefer simulations of a large number of nodes, based on simplified models. In this paper, we aim to obtain the advantages of both approaches, i.e., performing large, realistic, unexpensive, and flexible experiments, using real blockchain software within a virtual environment. To do that, we tackle the challenge of running large blockchain networks in a single physical machine, leveraging Linux and Docker. We analyze a number of problems that arise when large blockchain networks are emulated and we provide technical solutions for all of them. Finally, we describe our experience of emulating a fairly large blockchain network, comprising more than 3000 containers, for research purposes

Mining Network Events using Traceroute Empathy

In the never-ending quest for tools that enable an ISP to smooth troubleshooting and improve awareness of network behavior, very much effort has been devoted in the collection of data by active and passive measurement at the data plane and at the control plane level. Exploitation of collected data has been mostly focused on anomaly detection and on root-cause analysis. Our objective is somewhat in the middle. We consider traceroutes collected by a network of probes and aim at introducing a practically applicable methodology to quickly spot measurements that are related to high-impact events happened in the network. Such filtering process eases further in- depth human-based analysis, for example with visual tools which are effective only when handling a limited amount of data. We introduce the empathy relation between traceroutes as the cornerstone of our formal characterization of the traceroutes related to a network event. Based on this model, we describe an algorithm that finds traceroutes related to high-impact events in an arbitrary set of measurements. Evidence of the effectiveness of our approach is given by experimental results produced on real-world data.Comment: 8 pages, 7 figures, extended version of Discovering High-Impact Routing Events using Traceroutes, in Proc. 20th International Symposium on Computers and Communications (ISCC 2015

Problemas y desafíos de la información censal disponible para el estudio de la migración internacional

La medición de la migración es la variable de la dinámica demográfica con mayores problemas en su registro y en su calidad, y enfrenta los problemas de reconocer qué movimientos poblacionales constituyen efectivamente migraciones. Los censos son la única fuente de información que presenta una cobertura de representatividad nacional susceptible de desagregación territorial, e incluye a poblaciones de no migrantes (Martínez Pizarro, 2009: 121). El objetivo de este trabajo es analizar en qué medida los cuestionarios censales permiten cuantificar e identificar tipos de migración, especificando las potencialidades de las preguntas directas y de las indirectas incluidas en los propios cuestionarios censales y en encuestas como la de hogares o de la dinámica demográfica. Comparamos los censos de dos países de Europa, Alemania y España, y dos de América Latina, Argentina y México, con patrones migratorios que presentan similitudes y diferencias; revisando las posibilidades de construcción de la información a partir del diseño de sus cuestionarios, contextualizadas en sus procesos migratorios. El trabajo se organiza de la siguiente manera: revisión de las especificaciones generales sobre las preguntas censales y la medición de la migración, con especial referencia a la internacional; preguntas básicas de identificación de la migración en los censos; variables de identificación y construcción de tipologías de migración; los censos de Alemania, España, México y Argentina -características de construcción; variables de identificación de migración internacional, e identificación de migración y tipo de migrante-; demografía, migraciones y censos en Alemania y Argentina; y reflexiones finales. En el Anexo se incluyen las variables y preguntas de los censos de los países seleccionados.Facultad de Humanidades y Ciencias de la Educació

Chapter Analysis and representation for Digital Humanities: la Mappa Mosaico di Madaba. Digitalizzazione, analisi, decostruzione

The 43rd UID conference, held in Genova, takes up the theme of ‘Dialogues’ as practice and debate on many fundamental topics in our social life, especially in these complex and not yet resolved times. The city of Genova offers the opportunity to ponder on the value of comparison and on the possibilities for the community, naturally focused on the aspects that concern us, as professors, researchers, disseminators of knowledge, or on all the possibile meanings of the discipline of representation and its dialogue with ‘others’, which we have broadly catalogued in three macro areas: History, Semiotics, Science / Technology. Therefore, “dialogue” as a profitable exchange based on a common language, without which it is impossible to comprehend and understand one another; and the graphic sign that connotes the conference is the precise transcription of this concept: the title ‘translated’ into signs, derived from the visual alphabet designed for the visual identity of the UID since 2017. There are many topics which refer to three macro sessions: - Witnessing (signs and history) - Communicating (signs and semiotics) - Experimenting (signs and sciences) Thanks to the different points of view, an exceptional resource of our disciplinary area, we want to try to outline the prevailing theoretical-operational synergies, the collaborative lines of an instrumental nature, the recent updates of the repertoires of images that attest and nourish the relations among representation, history, semiotics, sciences

La formación superior sobre migración internacional en México

Introducción México es un país con una gran emigración internacional especialmente hacia los Estados Unidos y de tránsito hacia ese país, con mayor proporción de centroamericanos a los que, en los últimos tiempos, se han agregado caribeños y africanos. Esta situación genera una suerte de crisis humanitaria en la frontera norte y en la transmigración por el país en la que los migrantes están expuestos a todo tipo de atropellos por parte del crimen organizado y de las propias autoridades. La m..