In this paper, the propagation and scattering of acoustic waves in a flexible wave-guide involving step discontinuity at an interface is considered. The emerging boundary value problem is non-Sturm-Liouville and is solved by employing a hybrid mode-matching technique. The physical scattering process and attenuation of duct modes versus frequency regime and change of height is studied. Moreover,...

In the mode-division multiplexing (MDM) optical transmission system, a mode multi/demultiplexer is an important key device for excitation, multiplication, and separation of light signals which have distinct modes. In this report, we propose a fiber-type mode multi/demultiplexer based on selective phase matching between different cores/modes. Design method and device characteristics of 1x4 mode ...

nowadays, sar imaging systems have become more interesting for scientists. high spatial resolution of recent sar images has become a key factor for their accurate applications such as interferometry, radargrammetry and change detection. in these applications, sar image matching procedure is a critical step for conjugate point extraction which is much more difficult than the optical images. the ...

MEMS gyroscopes are used to detect rotation rates and have enabled a variety of motionbased technologies in a range of industries. They are composed of micro-machined polysilicon structures that resonate and deflect when a rotation is experienced. The topic of this thesis surrounds a system architecture to optimize the performance of a gyroscope. The MEMS gyroscope contains a resonator and an a...

A test-per-clock BIST method for combinational or full-scan circuits is proposed. The method is based on a design of a combinational block the decoder, transforming pseudo-random LFSR code words into deterministic test patterns. A Column-Matching algorithm to design the decoder is proposed. The Column-Matching method modified to support a mixed-mode BIST is proposed as well. Here the BIST is di...

A novel test-per-clock built-in self-test (BIST) equipment design method for combinational or full-scan circuits, together with necessary supplementary algorithms, is proposed in this Thesis. This method is mostly based on a design of a combinational block the Decoder, transforming pseudo-random code words into deterministic test patterns pre-computed by some ATPG tool. The Column-Matching algo...

Background & Aims: One of the important aims of quantitative cardiac image processing is the clarification of myocardial motions in order to derive biomechanical behavior of the heart in the disease condition. In this study we presented a computerized analysis method for detecting the instantaneous myocardial changes by using 2D echocardiography images. Methods: The analysis was performed on th...

We analyze the phase-matching conditions for second-harmonic generation (SHG) and optical parametric oscillation (OPO) in birefringent nonlinear semiconductor waveguides and apply these results to the model system of ZnGeP2 on a GaP substrate. The analyses and numerical results show that phase matching can be achieved for OPO and SHG for reasonable guide thicknesses throughout much of the infra...

A real-time ion cyclotron range of frequencies (ICRF) antenna matching system has been successfully implemented on Alcator C-Mod. This system is a triple-stub tuning system working at 80 MHz, where one stub acts as a pre-matching stub and the other two stubs use fast ferrite tuners (FFT) to accomplish fast tuning. It utilizes a digital controller for feedback control (200 μs per iteration) usin...