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PL
W publikacji przedstawiono koncepcję oraz konstrukcję systemu zagłuszania sygnałów radiowych przeznaczonego dla służb bezpieczeństwa publicznego i ratownictwa. Zagłuszarkę oparto na układzie cyfrowej, bezpośredniej syntezy sygnału. Urządzenie będzie dostępne w dwóch wersjach obudów — walizkowej i stacjonarnej.
EN
In the paper we present a concept and design of the system for the radio jamming that is addressed for organizations of public protection and disaster relief. The jammer is based on a Digital Direct Synthesis circuit. The device will be available in two chassis — portable suitcaselike and rack-mounted.
EN
So far in Poland, the Asian clam Corbicula fluminea has been reported from the Oder (Odra) and Vistula River. Its new population has been discovered in the Warta-Gopło Canal in Konin (central Poland), where water temperature can reach 34°C, as the canal is a part of a power plant lake cooling system. The spatial distribution of C. fluminea was found to be very uneven and that is probably why this species was not found during earlier research. The highest density of C. fluminea was 78 ind.·m-2 at the site where water flow was the fastest (2.49 m·s-1), providing sufficient oxygenation of the water. The results suggest that existing information about the distribution of C. fluminea may be far from complete because the clam can be present also in the habitats that were not regarded as suitable for the species according to earlier reports, and therefore have not been monitored for its presence.
PL
W artykule przedstawiono aplikację inteligentnego przełącznika podnoszącego niezawodność i dostępność transmisji bezprzewodowej poprzez mechanizm przełączania między podłączonymi wieloma interfejsami radiowymi w funkcji parametrów określających jakość łącza transmisyjnego.
EN
In paper a software application of the smart switch is presented that allows improving reliability and availability of data transmission in wireless networks by switching among many radio interfaces according to the quality parameters measured for the communication links.
EN
The Asiatic bivalve Sinanodonta woodiana (Lea, 1834), which is more and more widespread in all parts of Europe, in Poland has been mostly reported from lentic waters, especially fish ponds. In contrast to some other European countries, no data have been published on its presence in rivers of Poland. In 2015, monitoring was carried out in the lower Oder River and in the mouth of the Warta River, as a result of which S. woodiana was recorded there for the first time. This was possible due to prolonged drought, which led to extremely low water levels in most of the inland water bodies and watercourses, so that other research methods could be used. The presented results confirm that the species spreads easily by colonizing waters of various types, which in the future may lead to the formation of large populations.
PL
W artykule zaprezentowano analizę rynku usług komunikacji między urządzeniami (M2M), który rozwija się dynamicznie m.in. w ramach rozwiązań internetu rzeczy. Skupiono się na problematyce adresowania urządzeń końcowych związanej z planem numeracji krajowej i jego pojemnością, a także na ewolucji kart SIM.
EN
Paper presents the analysis of M2M market that becomes more and more popular due to applications of Internet of Thing. The main focus is on numbering capacity and evolution of a SIM card.
EN
Sinanodonta woodiana (Lea 1834) is a new component of malacofauna and this condition enhances a new adaptation of predators preying on it. In 2010, during the autumn bird migration, an oystercatcher was observed feeding on this clam species alien to European fauna in the area of drained fish ponds (western Poland). The clams chosen by the oystercatcher were 64 to 98 mm long and 46 to 72 mm tall, whereby stabbing method was preferred to the hammering one. Theses sizes are greater than for other mussel species eaten by the oystercatcher. Mussels were typically collected in the depth of 7 cm, which reflects the maximum bill length in oystercatchers. Under some conditions, e.g. drained fish ponds, the population abundance of S. woodiana clam may significantly be affected by foraging birds, especially oystercatchers as suggested findings from our study.
EN
The study of fish ponds have confirmed the presence of nine new locations of Anodonta woodiana in Poland, with strong and vital populations. These are examples of Chinese pond mussels accidentally introduced along with fish imports. Comparison of known localities shows that more mussels are in eastern Poland, from which the migration path of A. woodiana progresses. Most often mussels settle in larger water reservoirs with elongated shapes. Older and longer mussels occur in deeper fish ponds. Moreover, the further south the location, the higher biomass can be obtained. The average age of mussels in a fish pond depends on its bed type and depth; however the latter has less influence. New locations of this species are also to be expected due to deliberate introduction; cases of resettlement of individual specimens of the Chinese pond mussel to new locations have been recorded.
8
Content available System wsparcia decyzji w ochronie roślin uprawnych
PL
Systemy wsparcia decyzji jako narzędzia informatyczne są wykorzystywane coraz częściej przez różne sektory rolnictwa stanowiąc pomoc dla rolników, plantatorów, hodowców czy ogrodników, odciążając ich od nieraz żmudnego szukania i weryfikacji informacji dotyczących procedur stosowania zabiegów rolniczych, środków ochrony roślin czy pasz. W pracy omówiono przykład wdrożenia takiego systemu opartego na bazie danych służącego ochronie roślin przed różnego typu agrofagami. Do jego budowy wykorzystano technologie internetowe.
EN
Decision support systems as IT tools are being used more and more often in various sectors of agriculture, helping the farmers, planters, breeders and gardeners by relieving them from sometimes strenuous search and verification of the information on the procedures of applying agricultural treatment, using pesticides or fodders. The work discusses an example of implementing such system and database for protecting plants from various types of pests. The system was built with the use of Internet technologies.
EN
The WiMAX (Worldwide Interoperability for Microwave Access) system based on the IEEE 802.16 family of standards is a promising technology for last-mile access. Both IEEE 802.16 and 3GPP-LTE systems candidate for becoming the 4G network of choice. The need to evaluate multiple performance enhancing techniques like MIMO, OFDM(A), novel channel coding schemes like non-binary LDPC codes, together with development of standards like IEEE 802.21, that aims at enabling handover and interoperability between heterogeneous network types, make rapid prototyping-based simulations an important issue. This paper presents a novel approach to 4G-oriented simulation environment that integrates popular network simulator (ns-2) and a Digital Signal Processing (DSP) to enable comprehensive link layer and cell level simulations. Proposed simulation environment is intended as an evaluation platform for assessing QoS/QoE and Connection Admission Control (CAC) algorithms designed for WiMAX systems. Moreover we study ways to improve simulation time (with focus on AWGN channel simulation) by using CUDA parallel processing technology for NVIDIA graphic cards.
EN
A new family of non-binary LDPC is presented that are based on a finite field GF(64). They may be successfully implemented in single-carrier and OFDM transmission system. Results prove that DAVINCI codes allow for improving the system performance and may be considered to be applied in the future mobile system.
PL
Przedstawiono przegląd modeli predykcji strat propagacyjnych stosowanych przy planowaniu sieci radiokomunikacji ruchomej lądowej. Analiza ta posłużyła wyborowi modelu najbardziej adekwatnego do opracowywania projektów propagacyjnych dla sieci standardu TETRA, budowanej przez krajowy sektor energetyczny. Opierając się na tym modelu dokonano porównania predykcji z pomiarami natężenia pola w instalacji testowej. Ponadto przedstawiono wybrane zagadnienia projektowe związane z przestrzennym odbiorem zbiorczym oraz optymalizacją projektu propagacyjnego.
EN
In paper we present a survey of propagation prediction models used in planning of land mobile radio networks. An analysis is to choose a model that is the most suitable in designing of nominal projects for TETRA networks built by the national energy sector. Using that model we show a comparison of modelling prediction and radio measurements done on a pilot system. Moreover selected issues concerning the space diversity and optimization of a propagation project are given.
12
Content available remote DAVINCI Codes as Example of High Performance Non-Binary LDPC
EN
The article presents a new family of non-binary LDPC which has been elaborated within a framework of DAVINCI project. They are based on a finite field GF(64). We compare their error rate to other channel coding techniques. Results prove that DAVINCI codes allow improving the coding performance.
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