Multiple independent communications are studied on optical bus parallel computing models. These models make use of an optical bus interconnect to provide for communication in a multi-processor system. The communication traffic studied in this paper results in potential frequent bus collisions. The well known collision detect mechanism is ineffective however due to the communication pipelining a...

We study in this paper the capacity of the downlink of OFDMA-based IEEE802.16 WiMAX system in the presence of two types of traffic, streaming and elastic. We focus in particular on the impact of Adaptive Modulation and Coding (AMC) as well as inter-cell interference resulting from different frequency reuse schemes. Several performance measures, namely blocking rates, mean transfer time and the ...

Ribosome stalling on mRNAs can decrease protein expression. To decipher ribosome kinetics at stall sites, we induced ribosome stalling at specific codons by starving the bacterium Escherichia coli for the cognate amino acid. We measured protein synthesis rates from a reporter library of over 100 variants that encoded systematic perturbations of translation initiation rate, the number of stall s...

Insufficient attention has been paid to physical trauma as a cause of morbidity and mortality in international travellers, despite travellers themselves ranking it among their most important pre-travel health concerns. Road traffic collisions (RTCs) are the most common cause of death in younger travellers. One of the significant factors contributing to motorist accidents is tourists’ disorienta...

Address assignment is a key challenge in ad hoc networks due to the lack of infrastructure. Autonomous addressing protocols require a distributed and self-managed mechanism to avoid address collisions in a dynamic network with fading channels, frequent partitions, and joining/leaving nodes. We propose and analyze a lightweight protocol that configures mobile ad hoc nodes based on a distributed ...

Compared to unicast traffic, multicast is not protected by any ARQ mechanism in 802.11 networks: collisions with other multicast and unicast transmissions are not detected and senders will not adapt to the contention situation by backing off. This results in an unreliable service for multicast transmissions. We propose early multicast collision detection (EMCD), an algorithm with the purpose of...

Address assignment could be a key challenge in unintended networks because of the dearth of infrastructure. Autonomous addressing protocols need a distributed and self-managed mechanism to avoid address collisions during a dynamic network with weakening channels, frequent partitions, and joining/leaving nodes. we have a tendency to propose and analyze a light-weight protocol that configures mob...

The wintertime maritime traffic operations in the Gulf of Finland are managed through the Finnish-Swedish Winter Navigation System. This establishes the requirements and limitations for the vessels navigating when ice covers this area. During winter navigation in the Gulf of Finland, the largest risk stems from accidental ship collisions which may also trigger oil spills. In this article, a mod...

The IEEE 802.15.4 standard allows for the deployment of cost-effective and energy-efficient multi-hop networks. This document features an in-depth presentation of an analytical model for assessing the performance of such networks. It considers a generic, static topology with Poisson distributed datacollection as well as data-dissemination traffic. The unslotted CSMA/CA MAC layer of IEEE 802.15....

This study introduces the scalability problem of many WDMA protocols for ring networks. We present a slotted access protocol and a scalable network architecture suitable for WDM ring metropolitan area networks. Each node is equipped with a pair of tunable transceivers to communicate exploiting all the fiber data wavelengths. Also, each node uses a pair of fixed tuned transceivers to exchange co...