Wyniki wyszukiwania - BazTech

1

LoCO: Local Cooperative Data Oﬄoading System Based on Location Information

Yamazaki Taku, Asano Kazuma, Arai Satoshi, Shimomura Yusuke, Miyoshi Takumi

Journal of Telecommunications and Information Technology

|

2019

|

nr 1

67--75

EN

The development of high speed mobile networks and the widespread use of smartphones have enabled users to easily obtain large data volumes via the Internet. This causes a heavy consumption of network resources, a burden on the available bandwidth. To solve such problems, a data oﬄoading method with a wireless LAN access point has been used to distribute traﬃc from mobile to ﬁxed networks. However, the method using wireless LAN access points can only change the communication paths but cannot reduce the overall traﬃc. This paper proposes a local cooperative data ofﬂoading system (LoCO) that reduces the overall traﬃc by sharing data, with direct communication between neighbors based on their location-related information. Moreover, the authors implemented the LoCO system on Android smartphones and clariﬁed its performance in comparison with a traditional client/server system through experiments to download data in a real-world environment.

2

Analiza zmian ładunku metali śladowych transportowanych wraz z zawiesinami wzdłuż biegu rzeki

Nocoń W., Barbusiński K., Nocoń K., Kernert J.

Ochrona Środowiska

|

2013

|

Vol. 35, nr 1

33--38

EN

The paper discusses potential use of changes in load of suspended solids and co-transported trace metal ions to define sectors of the river where increased sedimentation occurs as river bottom deposits. Therefore, flow rate of the river was being determined as well as content of total suspended solids and of selected metal ions (Zn, Cd, Cu, Mn, Pb, Cr, Ni, Fe) in suspended solids and bottom sediments. Changes in the load of suspended solids and of metals with suspended solids found along the course of the river (Klodnica, Upper Silesia) were estimated. It was established that under similar hydraulic conditions the load of metals associated with suspended solids was a function of change in the load of suspended matter. The results of the research allowed determination of sectors of the Klodnica River where sedimentation of the major part of suspended solids is observed and where the number of metal ions in the bottom sediments is increased. This will enable defining sectors of small and medium-sized rivers that require certain measures to be taken in order to improve their ecological state.

PL

Przedstawiono możliwości praktycznego wykorzystania zmian ładunku zawiesin i transportowanych wraz z nimi jonów metali śladowych do określenia odcinków koryta rzeki, na których następuje zwiększona sedymentacja zanieczyszczeń w postaci osadów dennych. W tym celu wyznaczano wartości strumienia objętości wody w rzece, zawartość zawiesin ogólnych oraz jonów wybranych metali (Zn, Cd, Cu, Mn, Pb, Cr, Ni, Fe) w zawiesinach i osadach dennych. Określono zmiany ładunku zawiesin oraz metali wraz z zawiesinami, jakie wystąpiły wzdłuż biegu rzeki (Kłodnica, Górny Śląsk). Stwierdzono, że ładunek metali śladowych związanych z zawiesinami, przy zbliżonych warunkach hydraulicznych, był funkcją zmian ładunku zawiesin. Wyniki badań pozwoliły na wskazanie odcinków rzeki, na których sedymentuje znaczna część zawiesin, a w osadach dennych występuje zwiększona zawartość związków metali śladowych. Umożliwi to wskazanie odcinków małych i średnich rzek, na których konieczne są zabiegi mające na celu poprawę ich stanu ekologicznego.

3

Performance analysis of reactive shortest path and multi-path routing mechanism with load balance

Pham P.P., Perreau S.

Journal of Telecommunications and Information Technology

|

2003

|

nr 2

38-47

EN

Research on multi-path routing protocols to provide improved throughput and route resilience as compared with single-path routing has been explored in details in the context of wired networks. However, multi-path routing mechanism has not been explored thoroughly in the domain of ad hoc networks. In this paper, we analyze and compare reactive single-path and multi-path routing with load balance mechanisms in ad hoc networks, in terms of overhead, traffic distribution and connection throughput. The results reveals that in comparison with general single-path routing protocol, multi-path routing mechanism creates more overheads but provides better performance in congestion and capacity, provided that the route length is within a certain upper bound which is derivable. The analytical results are further confirmed by simulation.