Survey of Inter-satellite Communication for Small Satellite Systems: Physical Layer to Network Layer View

Small satellite systems enable whole new class of missions for navigation, communications, remote sensing and scientific research for both civilian and military purposes. As individual spacecraft are limited by the size, mass and power constraints, mass-produced small satellites in large constellations or clusters could be useful in many science missions such as gravity mapping, tracking of forest fires, finding water resources, etc. Constellation of satellites provide improved spatial and temporal resolution of the target. Small satellite constellations contribute innovative applications by replacing a single asset with several very capable spacecraft which opens the door to new applications. With increasing levels of autonomy, there will be a need for remote communication networks to enable communication between spacecraft. These space based networks will need to configure and maintain dynamic routes, manage intermediate nodes, and reconfigure themselves to achieve mission objectives. Hence, inter-satellite communication is a key aspect when satellites fly in formation. In this paper, we present the various researches being conducted in the small satellite community for implementing inter-satellite communications based on the Open System Interconnection (OSI) model. This paper also reviews the various design parameters applicable to the first three layers of the OSI model, i.e., physical, data link and network layer. Based on the survey, we also present a comprehensive list of design parameters useful for achieving inter-satellite communications for multiple small satellite missions. Specific topics include proposed solutions for some of the challenges faced by small satellite systems, enabling operations using a network of small satellites, and some examples of small satellite missions involving formation flying aspects.Comment: 51 pages, 21 Figures, 11 Tables, accepted in IEEE Communications Surveys and Tutorial

Unifying Distributed Processing and Open Hypertext through a Heterogeneous Communication Model

A successful distributed open hypermedia system can be characterised by a scaleable architecture which is inherently distributed. While the architects of distributed hypermedia systems have addressed the issues of providing and retrieving distributed resources, they have often neglected to design systems with the inherent capability to exploit the distributed processing of this information. The research presented in this paper describes the construction and use of an open hypermedia system concerned equally with both of these facets

CHORUS Deliverable 2.1: State of the Art on Multimedia Search Engines

Based on the information provided by European projects and national initiatives related to multimedia search as well as domains experts that participated in the CHORUS Think-thanks and workshops, this document reports on the state of the art related to multimedia content search from, a technical, and socio-economic perspective. The technical perspective includes an up to date view on content based indexing and retrieval technologies, multimedia search in the context of mobile devices and peer-to-peer networks, and an overview of current evaluation and benchmark inititiatives to measure the performance of multimedia search engines. From a socio-economic perspective we inventorize the impact and legal consequences of these technical advances and point out future directions of research

Transport poverty meets the digital divide : accessibility and connectivity in rural communities

Peer reviewedPublisher PD

Alternative Archaeological Representations within Virtual Worlds

Traditional VR methods allow the user to tour and view the virtual world from different perspectives. Increasingly, more interactive and adaptive worlds are being generated, potentially allowing the user to interact with and affect objects in the virtual world. We describe and compare four models of operation that allow the publisher to generate views, with the client manipulating and affecting specific objects in the world. We demonstrate these approaches through a problem in archaeological visualization

Foodie environment MEAN web application

Currently, human beings are constantly in a rush. Nobody has the time to be conscious of their eating habits. This thesis aims to unify the cooking responsibilities on a website. Hence, the user is in control of the food intake while saving time. A MEAN project is developed to accomplish such a purpose, a web application based on an Angular client-side. Then, the resources come from a MongoDB database connected through an Express server-side. Everything is in a NodeJS runtime environment. Thus the result is a Single Page Application. The user can browse through any recipe in the database. To write personal recipes is an option too. Planning a weekly menu, writing the grocery list or having a food expenses imprint are the different features available. Therefore, it unifies the cooking duties in a highly responsive, multiplatform application.Actualmente, los humanos viven en tensión constante. Nadie tiene tiempo para ser consciente de sus hábitos alimenticios. Esta tesis pretende unificar las responsabilidades en el entorno de la cocina. De esta forma, el usuario tiene el control sobre su ingesta alimentaria mientras ahorra tiempo. Un proyecto MEAN es desarrollado para cumplir este propósito, una aplicación web basada en un cliente formulado en Angular. Seguidamente, los recursos son extraídos de una base de datos implementada en MongoDB conectada a través de un servidor definido con Express. El entorno de ejecución utilizado es NodeJS. Por lo tanto, el resultado es una aplicación de página única. El usuario puede consultar todas las recetas de la base de datos, o aportar nuevas personales. Las diferentes funcionalidades también son planear menús semanales, escribir la lista de la compra o llevar un seguimiento de los gastos en comida. De esta forma, se unifica todo el entorno alimenticio en una aplicación multiplataforma, altamente receptiva.Actualment, els humans viuen en tensió constant. Ningú té temps de ser conscient dels seus hàbits alimentaris. Aquesta tesi pretén unificar les responsabilitats lligades a la cuina en una aplicació web. D'aquesta manera, l'usuari controla la seva ingesta alimentària i estalvia temps. Un projecte MEAN és desenvolupat per aconseguir aquest objectiu, una web amb un client formulat en Angular. Seguidament, els recursos són obtinguts d'una base de dades de MongoDB connectada a través d'un servidor implementat en Express. L'entorn d'execució és NodeJS. Per tant, el resultat és una aplicació de pàgina única. L'usuari pot consultar qualsevol recepta de la base de dades o escriure una de nova. Les diferents funcionalitats són planificar un menú setmanal, fer la llista de la compra o tenir un seguiment de les despeses en l'entorn alimentari. Aconseguint així unificar les responsabilitats lligades a la cuina en una aplicació multiplataforma, altament responsiva