In this paper, an improved algorithm based on EZBC and its implementation architecture with low complexity and high performance are presented. The proposed algorithm utilizes the significance state table of quadtree nodes and the context look-up table to control the coding passes and form the context, so the proposed algorithm requires low memory and has low implementation complexity with the nearly same performance.

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This paper presents two methods for cryptanalysis of the CAVE algorithm, a four or eight round cryptographic algorithm currently used in mobile telephony. Our attacks demonstrate that CAVE is insecure (with any number of rounds) as a hash function for authentication or data integrity applications.

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The operation of the self-excited Brillouin/erbium fiber laser (BEFL) is experimentally demonstrated. It uses a forward pumped erbium-doped fiber (EDF) as a gain medium to generate a Brillouin-pump and amplify the Stokes frequency signals generated in a single-mode fiber (SMF). The operating wavelength varies with changes of coupling ratio of the looping arm. The optimum BEFL operation is obtained with a center wavelength at 1567.5nm by looping back 20% of BEFL output into the other end of the SMF. A stable and strong BEFL comb of up to 16 lines with approximately 11 GHz line spacing are produced at the 980-nm pump power of 118mW. The self-excited BEFL has the potential to be used in the future dense wavelength division multiplexing communication system.

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Influence of interference in synchronous systems is investigated. It shows new insight into interference phenomena in synchronous systems. According to the analysis, it is possible that the small perturbation to an oscillator is enhanced by positive feedback through the coupling with the other oscillatory system. It means that the inherent phase error caused by thermal noise can lead to large amount of jitter by interference even if there is no external noise. It also reveals the relationship between the occurrence of jitter and the frequency difference in plesiochronous system.

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To enhance the phase sensitivity of ultrasonic signals, phases of the multi-reference-wave are arranged around the maximum phase-sensitive region. The resolution of the phase detection is improved by magnifying the maximum sensitive phase detection outputs. A resolution of 40nm displacement (λ/200, 000) using 40kHz air-coupled ultrasonic waves has been achieved.

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The treatment of Ultra WideBand systems in a three dimensional Alternating Direction Implicit Finite Difference Time Domain is given. Unavoidable artifacts caused by insufficient source sampling of UWB signals in ADI-FDTD are described. An empirical approach of determining the appropriate temporal discretization is proposed and verified by numerical experiments.

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