Wyniki wyszukiwania - BazTech

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Network Topology Mutation as Moving Target Defense for Corporate Networks

Rawski Mariusz

International Journal of Electronics and Telecommunications

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2019

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Vol. 65, No. 4

571--577

EN

The paper introduces a topology mutation – the novel concept in Moving Target Defense (MTD). MTD is a new technique that represents a significant shift in cyber defense. Traditional cybersecurity techniques have primarily focused on the passive defense of static networks only. In MTD approach cyber attackers are confused by making the attack surface dynamic, and thus harder to probe and infiltrate. The emergence of Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technology has opened up new possibilities in network architecture management. The application of combined NFV and SDN technologies provides a unique platform for implementing MTD techniques for securing the network infrastructure by morphing the logical view of the network topology.

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Sedimentary response to tectonic uplift of the Dukla basin margin recorded at Skrzydlna – the Menilite Beds (Oligocene), Outer Carpathians, S Poland

Siemińska A., Starzec K., Godlewski P., Wendorff M.

Geology, Geophysics and Environment

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2018

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Vol. 44, no. 2

231--244

EN

The Menilite Beds (Oligocene of Polish Flysch Carpathians) at Skrzydlna crops out in a structurally complex zone of the Fore-Magura Unit, which is tectonically overridden by Magura Nappe thrust form the S. The exposed sedimentary suite, representing the Dukla Basin, consists of fine-grained, well organised strata deposited in a low-energy, deep marine basin, which are abruptly overlain by poorly organised, coarse sandy conglomerate that forms a Mass Transport Deposit (MTD) complex. The MTD contains large boulders of extrabasinal rocks, massive sandstone beds with intrabasinal mudstone clasts, and slump sheets of sandstones. Above rests a fining- upwards sequence of sandstone beds interlayered with mudstones. The fine-grained facies reappear above to terminate the exposed succession. Erosional contacts and rapid facies changes, both vertical and lateral, are characteristic for the MTD unit. The sandstone-mudstone unit above contains laterally migrating erosional channels filled with massive sandy conglomerate in the lower part. Turbidites of varying density and completeness of internal structures that occur above are accompanied by an association of mixed facies including large-scale dune cross-bedding. Mineralogically, the sandstones are quartz arenites, sub-lithic arenites and wackes. Calcarenite grains – bioclasts, micrite and marl occur in substantial proportions only in the uppermost part of the succession. The point-counting data plotted on Qm-F-Lt diagram are clustered within the recycled fields: quartzose and transitional. Mineralogical maturity of the sandstones has the tendency to decrease from the sub-MTD strata upwards via the MTD unit to the lower part of the sandstone-mudstone complex; then it increases to the youngest sandstone beds with carbonate grains. These tendencies, associated with sedimentary features of the succession, reflect rapid uplift, emergence and progressive erosion of the terrigenous detritus source area, followed by tectonic stabilisation reflected by the appearance of the “carbonate factory”.

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Wyniki filtracji MTD rzeczywistych zobrazowań zarejestrowanych radarem

Bolek M., Zych M.

Elektronika : konstrukcje, technologie, zastosowania

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2013

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Vol. 54, nr 2

69-71

PL

Jeden z głównych problemów dotyczących optymalnego odbioru sygnału przez radar, związany jest z eliminacją sygnałów zakłócających. Przykładem systemów, które przeciwdziałają tego typu problemom są układy filtracji dopplerowskiej MTD (ang. Moving Target Detection). Celem filtracji MTD jest zapewnienie optymalnego wykrycia sygnału na tle zakłóceń biernych. System filtracji dopplerowskiej opiera swoje działanie na zjawisku Dopplera. Przeprowadzając odpowiednią filtrację zarejestrowanych zobrazowań po kompresji odległościowej możliwe jest usunięcie echa od obiektów niebędących celem wykrycia. Takimi obiektami, niezmieniający-mi swego położenia są drzewa, góry, budynki. Sygnały echa zarejestrowanego od tego typu obiektów określane są w literaturze angielskiej mianem clutteru. Układy MTD, od ponad trzydziestu lat, są powszechnie stosowane w zastosowaniach cywilnych jak i wojskowych. Wykazują lepszą zdolność wykrywania obiektów niż rozwiązania stosowane wcześniej. Ponadto w odróżnieniu od metody MTI (ang. Moving Target Indicator) umożliwiają oszacowanie prędkości radialnej wykrytego obiektu. W artykule przedstawiono wyniki symulacji komputerowej wykonane na podstawie zobrazowań po kompresji odległościowej pochodzących z radaru TRS-15C Konsberg wykonanego przez Przemysłowy Instytut Telekomunikacji SA Narzędziem, które posłużyło do wykonania filtracji dopplerowskiej był algorytm FFT (ang. Fast Fourier Transform). Otrzymane wyniki potwierdzają poprawną detekcję obiektu na tle zakłóceń biernych.

EN

One of the main problems concerning the optimum receiving of a signal by a radar is connected with the elimination of signal interference. An example of the systems which counteract this type of problems are the arrangements of the Doppler filtering - MTD (Moving Target Detection). The aim of the filtering is the assurance of optimum detection of a signal against the background of clutter. The system of the Doppler filtering bases its operating on the Doppler effect. Carrying out the suitable filtering of registered images after distance compression makes it possible to remove the echo from objects not being the aim of detection. Such objects which do not change their position are trees, mountains and buildings. The MTD systems have been widely used in civil and military fields for more than 30 years. They present a better ability of object detection than the solutions applied earlier. Moreover, as opposed to the MTI (Moving Target Indicator) system they enable the estimation of the detected object radial velocity. This article presents the results of a computer simulation executed on the basis of images after distant compression coming from the radar TRS-15C Konsberg made by the Przemysłowy Instytut Telekomunikacji SA. The algorithm FFT (Fast Fourier Transform) was the tool which enabled the Doppler filtering realization. The received results confirm the correct detection of an object against the background of clutter.

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Efektywne rozwiązanie problemu rozgrywki w otwarte karty w brydżu

Beling P.

Metody Informatyki Stosowanej

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2011

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nr 3

5-18

EN

This paper presents a review of algorithms which allow effective solution to a double dummy problem in the card game of Bridge. From game-theory point of view, the problem is a finite, zero-sum, two-player game with perfect information. It has a huge game tree (of the order of about 13! . 2 39 ≈ 3 .10 21, even if we assume that the average branching factor for players to follow the suit is just 2). The proposed solutions was implemented and checked in practice. Performance analyses and comparisons to another popular program are included.

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SYMDAS : Raw Data Simulator for the Radar with Electronically Controlled Beam

Mazurek G.

International Journal of Electronics and Telecommunications

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2011

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Vol. 57, No. 4

473-476

EN

The subject of the paper is the software simulator of baseband signals received in a radar. These synthetic signals are sent to the DSP unit responsible for target detection and estimation. The software has been developed in Warsaw University of Technology as a part of R&D project, and its main purpose is to allow flexible testing and validation of the algorithms running in DSP processors of the new radar.