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Využití a potlačování dvojlomných jevů v optovláknových senzorických aplikacích / Utilization and Suppression of Birefringence Phenomena in Optical Fiber Sensory ApplicationsMotúz, Rastislav January 2019 (has links)
The thesis deals with integral and distributed optical fiber sensors of electric current. In the area of integral sensors the analysis is performed by Jones matrix calculus and the simultaneous influence of induced circular and undesired linear birefringence using an ortho-conjugation retroreflector. Furthermore, the proposed conjugation loop variant using half-wave phase retarders is analyzed. The theoretical conclusions are confirmed by simulation and experimental measurement. In the field of distributed fiber optic sensors, analysis and simulation for the detection of plasma currents in thermonuclear fusion reactors, based on the POTDR technique, is performed. An improvement procedure is proposed for circular-shaped vacuum vessel reactors. Plasma current detection procedure in divertor-type reactors have been newly designed and simulated to investigate the effect of the OTDR detector noise on plasma current detection accuracy.
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A new model for worm detection and response. Development and evaluation of a new model based on knowledge discovery and data mining techniques to detect and respond to worm infection by integrating incident response, security metrics and apoptosis.Mohd Saudi, Madihah January 2011 (has links)
Worms have been improved and a range of sophisticated techniques have been
integrated, which make the detection and response processes much harder and
longer than in the past. Therefore, in this thesis, a STAKCERT (Starter Kit for
Computer Emergency Response Team) model is built to detect worms attack in
order to respond to worms more efficiently.
The novelty and the strengths of the STAKCERT model lies in the method
implemented which consists of STAKCERT KDD processes and the
development of STAKCERT worm classification, STAKCERT relational model
and STAKCERT worm apoptosis algorithm. The new concept introduced in this
model which is named apoptosis, is borrowed from the human immunology
system has been mapped in terms of a security perspective. Furthermore, the
encouraging results achieved by this research are validated by applying the
security metrics for assigning the weight and severity values to trigger the
apoptosis. In order to optimise the performance result, the standard operating
procedures (SOP) for worm incident response which involve static and dynamic
analyses, the knowledge discovery techniques (KDD) in modeling the
STAKCERT model and the data mining algorithms were used.
This STAKCERT model has produced encouraging results and outperformed
comparative existing work for worm detection. It produces an overall accuracy
rate of 98.75% with 0.2% for false positive rate and 1.45% is false negative rate.
Worm response has resulted in an accuracy rate of 98.08% which later can be
used by other researchers as a comparison with their works in future. / Ministry of Higher Education, Malaysia
and Universiti Sains Islam Malaysia (USIM)
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Physical Design of Optoelectronic System-on-a-Chip/Package Using Electrical and Optical Interconnects: CAD Tools and AlgorithmsSeo, Chung-Seok 19 November 2004 (has links)
Current electrical systems are faced with the limitation in performance by the electrical interconnect technology determining overall processing speed. In addition, the electrical interconnects containing many long distance interconnects require high power to drive. One of the best ways to overcome these bottlenecks is through the use of optical interconnect to limit interconnect latency and power.
This research explores new computer-aided design algorithms for developing optoelectronic systems. These algorithms focus on place and route problems using optical interconnections covering system-on-a-chip design as well as system-on-a-package design. In order to design optoelectronic systems, optical interconnection models are developed at first. The CAD algorithms include optical interconnection models and solve place and route problems for optoelectronic systems. The MCNC and GSRC benchmark circuits are used to evaluate these algorithms.
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