The NBS Boulder Laboratory is in the process of assembling a very high accuracy time transfer system. The system includes a 6.1 meter Ku-band satellite earth station, two transportable earth stations each with a 1.8 meter dish, and commercial modems designed for two-way timing. Elements of the facilities are described in this paper. High-accuracy timing with this equipment using the two-way tim...

We consider the model of spatially distributed population consisting of two species with “predator – prey” interaction; each of the species occupies two stations. Transfer of individuals between the stations (migration) is not random and yields the maximization of a net reproduction of each species. Besides, each species implements reflexive behavior strategy to determine the optimal migration ...

In this paper, a new traffic separation mechanism is proposed for IEEE 802.11e networks. Such Traffic Separation Mechanism (TSm) allows the coexistence of CSMA default stations with real-time stations in the same network domain. A station implementing the proposed TSm scheme has the same operating behavior as a default IEEE 802.11e network station, except in what concerns the evaluation of the ...

This paper addresses predicting the impact of access gates on pedestrian flow operations in terms of levels-of-service, congestion levels, average walking times, delays incurred at the gates, etc. To tackle the problem at hand, pedestrian traffic operations for different station design alternatives are predicted using the microscopic pedestrian flow model NOMAD. This is done for reference situa...

It is reported that, even in IEEE 802.11n wireless local area network (WLAN), the performance anomaly occurs which reduces the throughput of all stations when there are some stations communicating with low data rate. But, the previous paper uses a manually configured environment in the Transmission Control Protocol (TCP) uplink performance evaluation. In this paper, we show the results of exper...

WIMAX is a wireless high speed internet communication technology in geographical areas which is having higher data transfer rate. This is a emerging data transfer mechanism for its superior quality over their former communication technology like cable-modem and DSL connections. Mobile devices scans more channels in order to search neighboring base stations which selects the optimal target. The ...