Process Monitoring on Sequences of System Call Count Vectors

We introduce a methodology for efficient monitoring of processes running on hosts in a corporate network. The methodology is based on collecting streams of system calls produced by all or selected processes on the hosts, and sending them over the network to a monitoring server, where machine learning algorithms are used to identify changes in process behavior due to malicious activity, hardware failures, or software errors. The methodology uses a sequence of system call count vectors as the data format which can handle large and varying volumes of data. Unlike previous approaches, the methodology introduced in this paper is suitable for distributed collection and processing of data in large corporate networks. We evaluate the methodology both in a laboratory setting on a real-life setup and provide statistics characterizing performance and accuracy of the methodology.Comment: 5 pages, 4 figures, ICCST 201

A Simple Method for Estimation of the Scattering Exponent of Nanostructured Glasses

For most of nanostructured glasses (NGs) (phase-separated glasses and glass-ceramics), the light scattering coefficient (turbidity) is described by a power function of the inverse wavelength with an exponent which differs appreciably from the Rayleigh value 4 and is called the scattering exponent. The knowledge of the scattering exponent of a material is important from both fundamental and practical points of view. Previously, we developed three rather complex methods to determine the scattering exponent. Here, we present a novel simple express method for its estimation. In the method, the measured optical density for only one sample is used, the refractive index of the material is not required, and the dispersion of refractive index is assumed to be insignificant. The method is based on the differentiation of the measured optical density with respect to the wavelength. The scattering exponent values obtained by the new method for NGs of different types are in good agreement with those found by the traditional methods. The new method is found to be applicable even to NGs with high dispersion of refractive index. Thus, the new method does not require the data on the refractive index dispersion and can be applied without restrictions

Transparent materials based on semiconducting ZnO: glass-ceramics and optical ceramics doped with rare-earth and transition-metal ions

International audienceThe structure of multiphase transparent glass-ceramics prepared from glasses by controlled crystallization and of optical ceramics prepared by uniaxial recrystallization hot pressing are compared. Glass-ceramics and ceramics were doped with rare-earth (RE) and transition metal (TM) ions.In the course of the glass-ceramics development, regions of structural inhomogeneity enriched in ZnO are formed in the initial glass. Their composition depends on the type and concentration of the TM and RE ion and determines the difference in phase assemblage of glass-ceramics. In opticalceramics, cobalt ion enter the structure of ZnO and form the CoO phase. RE ions do not enter the structure of ZnO crystals, but are located on their surface and form the RE2O3 phase. ZnO optical ceramics doped with cobalt and RE ions should also be considered as multiphase materials