Internationale Zeitschrift für Sensornetzwerke und Datenkommunikation

The loss and dispersion of optical fiber are essential characteristics that should be identified in fiber optics design as optical transmission lines. To obtain acceptable Dispersion compensated fiber DCF, one way to achieve high negative dispersion is to modify the refractive index definition of DCF. In this paper, using the optifiber software, the zero dispersion wave length (ZDW) conversion is a transformer by changing the standard single-mode fiber S-SMF standard refractive index profile for single-mode fibers, and then promoting a profile designed to reduce dispersion, bending loss and splice loss. Performance analysis is done using two design of fiber profiles using finite difference method analysis. The achieved results, by compared the characteristics of the step-index with two ring profiles in two different designs analysis, it has been found that better results for dispersion and loss done by decreasing the width of the core and cladding region inside the fiber.

Advanced Persistent Threats (APTs) are explicitly designed to be difficult to detect, but their activities necessarily include some differences from what a regular user might do. We present an analysis and comparison of four machine learning algorithms that were used to first learn a user’s behavior and then to detect APT activity as an anomaly in that behavior. We also present our methodology for each step of the analysis. In particular, for each user, we collected data with Osquery on a clean machine before running the Red Team Automation (RTA) scripts to simulate an APT attack. The four algorithms we tested on each user’s data (neural networks, decision trees, kmeans clustering, and one-class SVM) included supervised, unsupervised and one-class algorithms. This study was undertaken as a proof-of-concept exercise to see if machine learning could be beneficial in APT detection, and our results indicate that looking at user behaviour for APT detection appears to be a promising approach. Previous work focused on APT behaviour (particularly in the context of network traffic), whereas our goal is to detect APTs on the computer where the legitimate user is present and active and to detect the APTs by discovering anomalies with respect to typical user behaviour.