221 research outputs found
Simulating model NIPDS for intrusion detection and prevention in telecommunication systems and networks
В статье предложена имитационная модель NIDPS (Network-based Intrusion Detection and Prevention System) для обнаружения и предотвращения вторжений в телекоммуникационных системах и сетях. NIDPS использует пакет Wireshark для реализации процедур захвата и фильтрации трафика, процедуры статистической обработки данных сетевого трафика, проверки гипотез, обработки полученных результатов и принятия решения о наличии вредоносной сетевой активности, что позволяет адаптивно реагировать на текущую ситуацию, при необходимости блокировать подозрительный трафик и рассылать предупреждения соседним узлам сети, на рабочую станцию сетевого администратора, сервер протоколирования атак и т.д. Разработанная модель может быть интерпретирована как сенсорная и аналитическая часть элементарной сетевой системы обнаружения вторжений на основе статистического анализа.
У статті запропонована імітаційна модель NIDPS (Network-based Intrusion Detection and Prevention System) для виявлення і запобігання вторгнень в телекомунікаційних системах і мережах. NIDPS використовує пакет Wireshark для реалізації процедур захоплення і фільтрації трафіку, процедури статистичної обробки даних мережевого трафіку, перевірки гіпотез, обробки отриманих результатів та прийняття рішення про наявність шкідливої мережевої активності, що дозволяє адаптивно реагувати на поточну ситуацію, при необхідності блокувати підозрілий трафік і розсилати попередження сусіднім вузлам мережі, на робочу станцію адміністратора, сервер протоколювання атак і т.д. Розроблена модель може бути інтерпретована як сенсорна і аналітична частина елементарної мережевої системи виявлення вторгнень на основі статистичного аналізу.
The paper proposes a simulation model NIDPS (Network-based Intrusion Detection and Prevention System) for intrusion detection and prevention in telecommunication systems and networks. NIDPS package uses Wireshark to capture and implement procedures to filter traffic, the procedures of statistical data processing network traffic, testing hypotheses, processing the results and the decision of a malicious network activity that allows adaptively respond to the current situation, if necessary, to block suspicious traffic and send warning neighboring nodes in the network, the workstation network administrator logging server attacks, etc. The developed model can be interpreted as sensory and analytical part of the elementary network intrusion detection system based on statistical analysis
Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions
The HERA-B collaboration has studied the production of charmonium and open
charm states in collisions of 920 GeV protons with wire targets of different
materials. The acceptance of the HERA-B spectrometer covers negative values of
xF up to xF=-0.3 and a broad range in transverse momentum from 0.0 to 4.8
GeV/c. The studies presented in this paper include J/psi differential
distributions and the suppression of J/psi production in nuclear media.
Furthermore, production cross sections and cross section ratios for open charm
mesons are discussed.Comment: 5 pages, 9 figures, to be published in the proceedings of the 6th
International Conference on Hyperons, Charm & Beauty Hadrons (BEACH04),
Chicago, IL, June 27 - July 3, 200
Search for the Flavor-Changing Neutral Current Decay with the HERA-B Detector
We report on a search for the flavor-changing neutral current decay using events recorded with a dimuon trigger in
interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find
no evidence for such decays and set a 90% confidence level upper limit on the
branching fraction .Comment: 17 pages, 4 figures (of which 1 double), paper to be submitted to
Physics Letters
Measurement of the J/Psi Production Cross Section in 920 GeV/c Fixed-Target Proton-Nucleus Interactions
The mid-rapidity (dsigma_(pN)/dy at y=0) and total sigma_(pN) production
cross sections of J/Psi mesons are measured in proton-nucleus interactions.
Data collected by the HERA-B experiment in interactions of 920 GeV/c protons
with carbon, titanium and tungsten targets are used for this analysis. The
J/Psi mesons are reconstructed by their decay into lepton pairs. The total
production cross section obtained is sigma_(pN)(J/Psi) = 663 +- 74 +- 46
nb/nucleon. In addition, our result is compared with previous measurements
Inclusive Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions
Inclusive differential cross sections and
for the production of \kzeros, \lambdazero, and
\antilambda particles are measured at HERA in proton-induced reactions on C,
Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to
GeV in the proton-nucleon system. The ratios of differential
cross sections \rklpa and \rllpa are measured to be and , respectively, for \xf . No significant dependence upon the
target material is observed. Within errors, the slopes of the transverse
momentum distributions also show no significant
dependence upon the target material. The dependence of the extrapolated total
cross sections on the atomic mass of the target material is
discussed, and the deduced cross sections per nucleon are
compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table
A Search for Selectrons and Squarks at HERA
Data from electron-proton collisions at a center-of-mass energy of 300 GeV
are used for a search for selectrons and squarks within the framework of the
minimal supersymmetric model. The decays of selectrons and squarks into the
lightest supersymmetric particle lead to final states with an electron and
hadrons accompanied by large missing energy and transverse momentum. No signal
is found and new bounds on the existence of these particles are derived. At 95%
confidence level the excluded region extends to 65 GeV for selectron and squark
masses, and to 40 GeV for the mass of the lightest supersymmetric particle.Comment: 13 pages, latex, 6 Figure
Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA
An investigation of the hadronic final state in diffractive and
non--diffractive deep--inelastic electron--proton scattering at HERA is
presented, where diffractive data are selected experimentally by demanding a
large gap in pseudo --rapidity around the proton remnant direction. The
transverse energy flow in the hadronic final state is evaluated using a set of
estimators which quantify topological properties. Using available Monte Carlo
QCD calculations, it is demonstrated that the final state in diffractive DIS
exhibits the features expected if the interaction is interpreted as the
scattering of an electron off a current quark with associated effects of
perturbative QCD. A model in which deep--inelastic diffraction is taken to be
the exchange of a pomeron with partonic structure is found to reproduce the
measurements well. Models for deep--inelastic scattering, in which a
sizeable diffractive contribution is present because of non--perturbative
effects in the production of the hadronic final state, reproduce the general
tendencies of the data but in all give a worse description.Comment: 22 pages, latex, 6 Figures appended as uuencoded fil
Limits for the central production of Θ+ and Ξ−− pentaquarks in 920-GeV pA collisions
We have searched for Θ+(1540) and Ξ−−(1862) pentaquark candidates in proton-inducedreactions on C, Ti, and W targets at midrapidity and s√=41.6 GeV. In 2×108 inelastic eventswe find no evidence for narrow (σ≈5 MeV) signals in the Θ+→pK0S and Ξ−−→Ξ−π− channels; our 95% C.L. upper limits (UL) forthe inclusive production cross section times branching fraction B dσ/dy $y ≈0 are (4-16) μb/N for a Θ+ mass between 1521 and 1555 MeV,and 2.5μb/N for the Ξ−−. The UL of the yield ratio of Θ+/Λ(1520)<(3-12)% is significantly lower than model predictions.Our UL of B Ξ−−/Ξ(1530)0<4% is at variance with the results that have provided the first evidencefor the Ξ−−
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