The article presents the statistical analysis results of network packet inter-arrival time distribution in academic computer network. Most popular transport protocols TCP and UDP are addressed in the research. Data was gathered using NetFlow protocol. Network traffic was divided into sections according its direction and usage trends, then packet interarrival time distributions were found. Kolmogorov-Smirnov test was used to evaluate goodness-of-fit of packet inter-arrival time distributions and it was determined, that Pareto Second Kind distribution fits the majority of the experimental distributions.
The article presents the statistical analysis results of an academic computer network traffic using the data gathered with NetFlow protocol. Results of the statistical analysis are presented in a visual manner which reveals the tendencies of computer network traffic distributions.
In this paper, four differently shaped Wilkinson power dividers are presented by selecting the same physical length of two-section transmission lines, dual arbitrary frequency band Wilkinson power dividers can be achieved. The 2.4 GHz (WLAN) and 5.9 GHz (DSRC IEEE 802.11p) frequency bands are selected to complement the future development of multi-band, multi-standard transceivers. To improve physical separation and electrical isolation between the two output ports a parallel RLC circuit is employed. For verification, the simulated and measured performance results of dual-band Wilkinson power dividers implemented on the Rogers 4003C laminate are presented. The measurement results for the fabricated Wilkinson power dividers were in good agreement with theoretical simulation results and show dual-band characteristics.
Network flows are easy to get and simple to store network activity data. The challenge is to interpret them efficiently from security and network engineering standpoint as payload and application layer protocol specific information is missing. The article presents the statistical analysis of network flows with the emphasis on packet size distribution. Existing packet size distribution researches were reviewed. Packet size distribution Cumulative Distribution Functions (CDFs) were produced from existing academic computer network data. The CDFs for protocols TCP, UDP, ICMP and popular application layer protocols (HTTP, DNS) were analysed. Network traffic statistics were further visualized using radar graph. Article provides reusable statistical analysis steps and statistical trends for academic computer network.
This article discusses one exemplary and one original laboratory work from the micro- and nano-electronics manufacturing process laboratory works cycle. These laboratory works have been successfully introduced into the undergraduate programme and have been attended by students for several years at Vilnius Gediminas Technical University, Faculty of Electronics. This laboratory work is unique in that it consistently displays and graphically depicts practically all CMOS transistor manufacturing processes: from the preparation of the silicon wafer to the final passivation. Silvaco TCAD tools are used in order to simulate these technological processes. This type of laboratory works provides students with the necessary knowledge of chip manufacturing processes and TCAD tools without the use of costly manufacturing equipment specific to each technological process in the fabrication chain, long-term experiments and a large amount of human resources. This article also presents and discusses student feedback statistics over several years of studies, the advantages of this laboratory work, recommendations for further improvement and formulates conclusions.
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