23,325 research outputs found
A Protocol for the Atomic Capture of Multiple Molecules at Large Scale
With the rise of service-oriented computing, applications are more and more
based on coordination of autonomous services. Envisioned over largely
distributed and highly dynamic platforms, expressing this coordination calls
for alternative programming models. The chemical programming paradigm, which
models applications as chemical solutions where molecules representing digital
entities involved in the computation, react together to produce a result, has
been recently shown to provide the needed abstractions for autonomic
coordination of services. However, the execution of such programs over large
scale platforms raises several problems hindering this paradigm to be actually
leveraged. Among them, the atomic capture of molecules participating in concur-
rent reactions is one of the most significant. In this paper, we propose a
protocol for the atomic capture of these molecules distributed and evolving
over a large scale platform. As the density of possible reactions is crucial
for the liveness and efficiency of such a capture, the protocol proposed is
made up of two sub-protocols, each of them aimed at addressing different levels
of densities of potential reactions in the solution. While the decision to
choose one or the other is local to each node participating in a program's
execution, a global coherent behaviour is obtained. Proof of liveness, as well
as intensive simulation results showing the efficiency and limited overhead of
the protocol are given.Comment: 13th International Conference on Distributed Computing and Networking
(2012
Big Data Model Simulation on a Graph Database for Surveillance in Wireless Multimedia Sensor Networks
Sensors are present in various forms all around the world such as mobile
phones, surveillance cameras, smart televisions, intelligent refrigerators and
blood pressure monitors. Usually, most of the sensors are a part of some other
system with similar sensors that compose a network. One of such networks is
composed of millions of sensors connect to the Internet which is called
Internet of things (IoT). With the advances in wireless communication
technologies, multimedia sensors and their networks are expected to be major
components in IoT. Many studies have already been done on wireless multimedia
sensor networks in diverse domains like fire detection, city surveillance,
early warning systems, etc. All those applications position sensor nodes and
collect their data for a long time period with real-time data flow, which is
considered as big data. Big data may be structured or unstructured and needs to
be stored for further processing and analyzing. Analyzing multimedia big data
is a challenging task requiring a high-level modeling to efficiently extract
valuable information/knowledge from data. In this study, we propose a big
database model based on graph database model for handling data generated by
wireless multimedia sensor networks. We introduce a simulator to generate
synthetic data and store and query big data using graph model as a big
database. For this purpose, we evaluate the well-known graph-based NoSQL
databases, Neo4j and OrientDB, and a relational database, MySQL.We have run a
number of query experiments on our implemented simulator to show that which
database system(s) for surveillance in wireless multimedia sensor networks is
efficient and scalable
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