To satisfy the needs of wireless data networking, study group 802.11 was formed under IEEE project 802 to recommend an international standard for Wireless Local Area Networks (WLANs). A key part of standard are the Medium Access Control (MAC) protocol needed to support asynchronous and time bounded delivery of data frames. It has been proposed that unslotted Carrier Sense Multiple Access with C...

A comparison between daily in-situ water level time series measured at ground-based hydrometric stations (HS – 1,899 stations located in twelve Brazilian basins) of the Agência Nacional de Águas (ANA) with vertically-integrated water height anomaly deduced from the Gravity Recovery and Climate Experiment (GRACE) geoid is carried out in Brazil. The equivalent water height (EWH) of 10-day interva...

A method to compare upper tropospheric humidity (UTH) from satellite and radiosonde data has been applied to the European radiosonde stations. The method uses microwave data as a benchmark for monitoring the performance of the stations. The present study utilizes three years (2001–2003) of data from channel 18 (183.31±1.00 GHz) of the Advanced Microwave Sounding Unit-B (AMSU-B) aboard the satel...

This paper presents an efficient recovery scheme to provide fault-tolerance for the mobile computing systems. The proposed scheme is based on the message logging and the independent checkpointing. For the efficient management of the recovery information, such as checkpoints and message logs, the movement-based scheme is suggested. The mobile host carrying its recovery information to the nearby ...

This paper analyzes the dependence of properties turbid flow on dispersion composition and concentration solid particles. The article presents features transfer river suspended solids water in pressure stations, that is, effect distribution kinematic dynamic parameters particles hydraulic transport.

The overwhelming number of radio stations, both online and over the air, makes the choice of an appropriate program difficult. By profiling the program content of radio stations using Self-Organizing Maps we provide a reflection of a station’s program type and give potential listeners a visual clue for selecting radio stations. Profiles of current broadcasts indicate which program type a statio...

are working on techniques to make this protocol more scalable. This includes a quantitative analysis and measurement of the resource utilization in the wired network and base stations, and techniques to reduce this consumption. As part of the Daedalus project, we are also investigating ways of having multiple wireless communication devices on a mobile host, each with different network character...

Within this paper the actual cluster analysis is performed in order to identify clusters within Kaposvár district heating. The data was measured not directly at households but heat transfer stations. smart meters were installed stations for several reasons, measure and control needed supply temperature also leakages quicker easier. method used k-means which end did determine four different clus...

“Geomagnetically induced currents” (GIC) in ground-based technological networks are a manifestation of space weather. GIC are a potential source of problems to the systems and therefore important in practice. GIC in a power system (or in principle in any other discretely-earthed system) can be calculated conveniently by using matrix equations presented earlier. Since temporal variations associa...