Search results for "Protocol"

The diagnostic protocol of congenital uterine anomalies

2008

A Dynamic Distributed Algorithm for Multicast Path Setup

2005

In the past few years, there has been a considerable work on multicast route selection techniques, with the aim to design scalable protocols which can guarantee an efficient use of network resources. Steiner tree-based multicast algorithms produce optimal trees, but they are prohibitively expensive. For this reason, heuristic methods are generally employed. Conventional centralized Steiner heuristics provide effective solutions, but they are unpractical for large networks, since they require a complete knowledge of the network topology. In this paper, we propose a new distributed approach that is efficient and suitable for real network adoption. Performance evaluation indicates that it outp…

An efficient distributed approach for dynamic multicast trees

2005

In this paper we present a distributed algorithm for constructing efficient multicast trees in large networks. The algorithm allows the set up of effective distribution trees using a coordination protocol among the network nodes. The algorithm has been implemented and extensively tested both in simulation, and on experimental networks. Performance evaluation indicates that our approach outperforms the state-of-the-art distributed algorithms for multicast tree setup, providing good levels of convergence time and communication complexity. Furthermore, we introduce a distributed technique for dynamically updating the multicast tree. The approach monitors the accumulated damage as nodes join or…

Link adaptation with combined optimal frame size and rate selection in error-prone 802.11n networks

2008

In error-prone channel with low SNRs, the network throughput may drop significantly if the packet length becomes too large. On the other hand, too much protocol overhead will be introduced if the packet length is too small. In this paper, we study this tradeoff and propose an adaptive frame size algorithm for A-MPDU in 802.11n networks, which can maximize the throughput by selecting the optimized frame length under different channel conditions. When used together with rate selection, the network throughput can be further improved. Both analytical model and simulation results are presented, demonstrating that our algorithm outperforms the fixed length transmission scheme in 802.11n networks …

Design of Low-Cost Noise Measurement Sensor Network: Sensor Function Design

2010

In this paper, we report the sensor function design and implementation of a wireless sensor network application for measuring environmental acoustic noise. The system is built on ATmega128 and CC2420 platform. The protocol stack is based on CiNet stack with a global synchronization scheme and supports multi-hop communications. Strict filtering function specified by ITU-R 468 (namely A-weighting) is followed. Both the indoor and outdoor test results were compared with standard sound level meters (CESVA SC-20c and Pulsar94) and showed a less than ±2dB error in both short-term and longterm measurement. Power consumption has been measured that a single AA-type battery can sustain the applicatio…

From vertical to horizontal architecture

2006

Some of the main challenges related to wireless sensor networks implementation are low-quality communication, energy conservation, resource-constrained computation, distributed network management, data processing and the scalability of the protocols. This combination makes the implementation of software a demanding task and encourages to new approaches when thinking of software architecture.In this paper an architecture combining a low protocol stack with a cross-layer management entity is presented. One of the main ideas behind the architecture presented is to make application programming easier and to simplify the protocol stack in such a way that it would suit better for the limited reso…

Test-Bed Evaluation of CA and CF via a Software Defined Radio

2019

In Chaps. 3 and 4, we presented the analytical models and simulation approaches to study the impact of CA and CF on traffic flows in the single-flow single-user and the single-flow multi-user systems. In this chapter, we investigate the impact of CA and CF in a test-bed. We employ a software defined radio (SDR) from National Instruments (NI) to evaluate the performance of a CR system with user datagram protocol (UDP) flows. The adopted SDR is based on LTE protocol stack with additional functionalities that can support CA and CF, and accommodating PUs. By conducting measurements based on the test-bed system, we will be able to confirm that performance improvement can indeed be obtained by ap…

Prefazione

2021

The contribution constitutes the introduction to the implementation of Guidelines for a protocol to intervene, with an established methodological process, on the issues of accessibility, physical and cultural, in historic cities

Protocolo de toma de muestras en supuestos de agresión sexual. Revisión de casos entre 2011-2014

2015

Se muestra el protocolo que sigue el servicio de microbiología del CHGUV para los casos de agresión sexual, el kit para la toma de muestras y los procesos de conservación y transporte. Su objetivo es demostrar que la estandarización en los proceso y los kits, mejoran la calidad de las muestras.

Pragmatica respectant a les Notes dels Actes rebuts per los Notaris difunts, y Regents de aquelles / manada publicar per lo ... Iusticia en les cause…

1681

Crida per a donar a coneixer la Pragmàtica, publicada el 22 d'Octubre de 1681 en la Ciutat de València Caplletra ornada al començament del text Sign. : A6 Reclams