scholarly journals VoIP Anomaly Detection - selected methods of statistical analysis

2017 ◽  
Vol 16 (2) ◽  
pp. 14
Author(s):  
Paweł Dymora ◽  
Miroslaw Mazurek ◽  
Sławomir Jaskółka
Keyword(s):  
Anomaly Detection ◽  
Normal Values ◽  
Scientific Work ◽  
Hurst Parameter ◽  
Simulation Studies ◽  
Self Similarity ◽  
The World ◽  
Fundamental Challenge ◽  
Self Similar ◽  
Traffic Anomaly

<p>Self-similarity analysis and anomaly detection in networks are interesting fields of research and scientific work of scientists around the world. Simulation studies have demonstrated that the Hurst parameter estimation can be used to detect traffic anomaly. The actual network traffic is self-similar or long-range dependent. The dramatic expansion of applications on modern networks gives rise to a fundamental challenge to network security. The Hurst values are compared with confidence intervals of normal values to detect anomaly in VoIP.</p>

A Novel Network Traffic Anomaly Detection Based on Multi-Scale Fusion

2011 ◽  
Vol 48-49 ◽  
pp. 102-105
Author(s):  
Guo Zhen Cheng ◽  
Dong Nian Cheng ◽  
He Lei
Keyword(s):  
Anomaly Detection ◽  
False Alarm ◽  
False Alarm Rate ◽  
Network Traffic ◽  
Self Similarity ◽  
Data Set ◽  
Multi Scale ◽  
Traffic Anomaly ◽  
Detection Evaluation ◽  
Better Than

Detecting network traffic anomaly is very important for network security. But it has high false alarm rate, low detect rate and that can’t perform real-time detection in the backbone very well due to its nonlinearity, nonstationarity and self-similarity. Therefore we propose a novel detection method—EMD-DS, and prove that it can reduce mean error rate of anomaly detection efficiently after EMD. On the KDD CUP 1999 intrusion detection evaluation data set, this detector detects 85.1% attacks at low false alarm rate which is better than some other systems.

Falta de interés por la ciencia en la formación profesional de estudiantes de la ESIME-IPN, México / Lack of Interest for Science in the Professional Education of Students of the Esime-IPN, Mexico

2019 ◽  
Vol 6 (1) ◽  
pp. 35-41
Author(s):  
Armando Martínez Ríos
Keyword(s):  
Professional Education ◽  
Web Site ◽  
Mechanical Engineering ◽  
Science And Technology ◽  
Scientific Work ◽  
Scientific Culture ◽  
The World ◽  
Education Of Students

ABSTRACTMexico lacks a scientific culture. Investigations and reports show that only has a record of 38 thousand scientific and 0.5% global of registered patents in the world. Communications and electronics engineering (ICE) is one of the three formations in the school of mechanical engineering and electrical (ESIME) unit Zacatenco from the Instituto Politécnico Nacional (IPN) Mexico. Among the objectives of this mentioned formation on its web site, is the form professionals with scientific and technological foundations; However, the curriculum includes only two subjects with these characteristics. Less than 1% of the graduates also choose to devote himself to scientific work. This paper shows the results obtained by means of a survey on the perception that students have about scientists in order to propose actions that foster a greater interest in them by the science and technology into their professional formation.RESUMENMéxico carece de una cultura científica ya que algunas encuestas muestran que solo se tiene un registro de 38 mil científicos y el 0.5% del total mundial de patentes registradas. Ingeniería en Comunicaciones y Electrónica (ICE) es una de las tres carreras de la Escuela Superior de Ingeniería Mecánica y Eléctrica (ESIME) unidad Zacatenco del Instituto Politécnico Nacional (IPN) México. Entre los objetivos de esta carrera mencionado en su sitio web, es el de formar profesionistas con fundamentos científicos y tecnológicos; sin embargo, el currículo, contempla solo dos asignaturas con estas características. Asimismo, menos del 1% de los egresados elige dedicarse a una labor científica. Este trabajo muestra los resultados obtenidos por medio de una encuesta sobre la percepción que los estudiantes tienen sobre los científicos con el fin de proponer acciones que fomenten un mayor interés en ellos por la ciencia y la tecnología dentro de su formación.

scholarly journals Onset of the Mach Reflection of Zel’dovich–von Neumann–Döring Detonations

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 314
Author(s):  
Tianyu Jing ◽  
Huilan Ren ◽  
Jian Li
Keyword(s):  
Hot Spot ◽  
Mach Reflection ◽  
Near Field ◽  
The Self ◽  
Small Scale ◽  
Mach Stem ◽  
Self Similarity ◽  
Von Neumann ◽  
Similarity Problem ◽  
Self Similar

The present study investigates the similarity problem associated with the onset of the Mach reflection of Zel’dovich–von Neumann–Döring (ZND) detonations in the near field. The results reveal that the self-similarity in the frozen-limit regime is strictly valid only within a small scale, i.e., of the order of the induction length. The Mach reflection becomes non-self-similar during the transition of the Mach stem from “frozen” to “reactive” by coupling with the reaction zone. The triple-point trajectory first rises from the self-similar result due to compressive waves generated by the “hot spot”, and then decays after establishment of the reactive Mach stem. It is also found, by removing the restriction, that the frozen limit can be extended to a much larger distance than expected. The obtained results elucidate the physical origin of the onset of Mach reflection with chemical reactions, which has previously been observed in both experiments and numerical simulations.

scholarly journals Depressurization-Induced Nucleation in the “Polylactide-Carbon Dioxide” System: Self-Similarity of the Bubble Embryos Expansion

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1115
Author(s):  
Dmitry Zimnyakov ◽  
Marina Alonova ◽  
Ekaterina Ushakova
Keyword(s):  
Initial Rate ◽  
Initial Pressure ◽  
External Pressure ◽  
Self Similarity ◽  
Embryo Formation ◽  
Linear Behavior ◽  
Joint Influence ◽  
External Pressures ◽  
Adiabatic Cooling ◽  
Self Similar

Self-similar expansion of bubble embryos in a plasticized polymer under quasi-isothermal depressurization is examined using the experimental data on expansion rates of embryos in the CO2-plasticized d,l-polylactide and modeling the results. The CO2 initial pressure varied from 5 to 14 MPa, and the depressurization rate was 5 × 10−3 MPa/s. The constant temperature in experiments was in a range from 310 to 338 K. The initial rate of embryos expansion varied from ≈0.1 to ≈10 µm/s, with a decrease in the current external pressure. While modeling, a non-linear behavior of CO2 isotherms near the critical point was taken into account. The modeled data agree satisfactorily with the experimental results. The effect of a remarkable increase in the expansion rate at a decreasing external pressure is interpreted in terms of competing effects, including a decrease in the internal pressure, an increase in the polymer viscosity, and an increase in the embryo radius at the time of embryo formation. The vanishing probability of finding the steadily expanding embryos for external pressures around the CO2 critical pressure is interpreted in terms of a joint influence of the quasi-adiabatic cooling and high compressibility of CO2 in the embryos.

Robust feature selection and robust PCA for internet traffic anomaly detection

2012 ◽  
Author(s):  
Claudia Pascoal ◽  
M. Rosario de Oliveira ◽  
Rui Valadas ◽  
Peter Filzmoser ◽  
Paulo Salvador ◽  
...  
Keyword(s):  
Feature Selection ◽  
Anomaly Detection ◽  
Internet Traffic ◽  
Robust Pca ◽  
Traffic Anomaly ◽  
Traffic Anomaly Detection
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