Appareil mobile

Résumé

thumb|Exemple d'un appareil mobile. Un appareil mobile (traduction littérale du terme anglophone « mobile device ») est un appareil informatique portatif utilisable de manière autonome lors d'un déplacement. Les appareils mobiles sont de petite taille — certains peuvent être mis dans les poches. Ils sont typiquement dérivés des téléphones mobiles, et permettent d'accéder au Web, de lire du courrier électronique, de prendre des photos, de jouer à des jeux vidéo, d'écouter de la musique, de regarder des clips vidéo ou bien de télécharger des applications. Ils peuvent également comporter un calendrier ou un carnet d'adresses. La plupart des appareils mobiles n'ont pas de disque dur et les programmes sont enregistrés sur des mémoires internes ou des cartes. Ils fonctionnent sur batterie, ont un écran de petite taille, un clavier dépouillé, et peu de puissance de calcul. Ils sont typiquement d'usage personnel Il est souvent possible de les relier à

Source officielle

https://fr.wikipedia.org/wiki/Appareil_mobile

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Content Management in Mobile Wireless Networks

Francisco De Meneses Neves Ramos Dos Santos

Approximately one billion users have access to mobile broadband, through which they intend to obtain the same data they can reach using a wired connection. Because of the cost of transmitting data over a mobile-broadband connection and given that 3G networks are quickly reaching their data-transfer capacity, some researchers envision the inter-connection of mobile devices using Wi-Fi, forming a challenged network. Such networks suffer from high latency, low data rates, and frequent disconnections; because end to end paths between pairs of nodes may not always exist, a mobile device must store content before delivering it to the intended receivers. We designed the content-optimal delivery algorithm (CODA) for distributing named data over a delay-tolerant network (DTN), which is a network of challenged networks. Current content-dissemination techniques for DTNs consist mainly of the following items: a content store, for caching and indexing retrieved content, and a query and response mechanism to search the network for matching content. Some algorithms attempt to optimize an objective function, such as the total delivery-delay. While disseminating content, CODA maximizes the network throughput by computing the utility of each item published: a device with a full buffer drops content in order of increasing utility and transmits content in order de- creasing utility. We implemented CODA over the CCNx protocol, which provides the basic tools for querying, caching, and transmitting content.

2012

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Toward Mobile Distributed Ledgers

Dimitrios Chatzopoulos, Boi Faltings, Sujit Prakash Gujar, Anurag Jain

Advances in mobile computing have paved the way for new types of distributed applications that can be executed solely by mobile devices on Device-to-Device (D2D) ecosystems (e.g., crowdsensing). Sophisticated applications, like cryptocurrencies, need distributed ledgers (DLs) to function. DLs, such as blockchains and directed acyclic graphs (DAGs), employ consensus protocols to add data in the form of blocks. However, such protocols are designed for resourceful devices that are interconnected via the Internet. Moreover, existing DLs are not deployable to D2D ecosystems since their storage needs are continuously increasing. In this work, we introduce and analyze Mneme, a DAG-based DL that can be maintained solely by mobile devices. Mneme utilizes two novel consensus protocols: 1) Proof of Context (PoC) and 2) Proof of Equivalence (PoE). PoC employs users' context to add data on Mneme. PoE is executed periodically to summarize data and produce equivalent blocks that require less storage. We analyze Mneme's security and justify the ability of PoC and PoE to guarantee the characteristics of DLs: persistence and liveness. Furthermore, we analyze potential attacks from malicious users and prove that the probability of a successful attack is inversely proportional to the square of the number of mobile users who maintain Mneme.

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

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A novel approach for mobile device design: GA-based distributed optimization to comply with OTA, SAR, and HAC standards

Nicolas Chavannes

Institute of Electrical and Electronics Engineers2012

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