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We present DAGSENS, a new approach to parametric transient sensitivity analysis of Differential Algebraic Equation systems (DAEs), such as SPICE-level circuits. The key ideas behind DAGSENS are, (1) to represent the entire sequence of computations from DAE parameters to the objective function (whose sensitivity is needed) as a Directed Acyclic Graph (DAG) called the “sensitivity DAG”, and (2) to compute...
The constant rapid growth and development of modern medical technology has resulted in an ever-growing demand for higher quality health monitoring systems. This is especially true for the development of the Internet of Things: as the Internet of Things becomes more ubiquitous in dally life, so does the possibility of, and demand for, the ability to remotely monitor the health of patients at anytime,...
ZAO thin films with low surface roughness and low sheet resistance are required in the touch panels and display panels. In this work, we investigated the substrate cooling effect of ion beam post treatment on ZAO films properties, and one new way of obtain low surface roughness and low sheet resistance same time was proposed. The more exciting find of this paper is that, comparing to the samples without...
Among methods modeling electronic structures of low dimensional heterostructures, such as first principles, tight binding, k·p, etc., the multiband k·p method is the most effective for low dimensional systems with a big compilation of atoms such as quantum dots. Numerical implementation like the finite difference method and the finite element method engages differential or integral process and thus...
The aim of this study is to make micro-patterning replication of planar optical elements by imprinting technique based on excellent physical properties of silicone LED encapsulants such as good thermal stability and high optical transmittance.
We propose and study a hybrid plasmonic waveguide structure with gain medium. The structure is based on silicon with gain medium to be III–V compound semiconductor, which can be realized by bonding technology.
Gain-assisted surface plasmon polaritons (SPPs) propagation is realized by electrical pumping the InGaAsP quantum wells (QWs) beneath the metal waveguide with asymmetric configuration. The long-range and short-range mode SPPs are analyzed theoretically and observed experimentally under different levels of current injection. It is demonstrated that among the complex SPP-coupled emission mechanisms,...
Many subsystems encountered in communication systems can be modeled as linear periodic time-varyiing (LPTV) systems. In this paper, we present a novel structure preserving reduced-order modeling algorithm for LPTV systems. A key advance of our approach is that it preserves the periodic time-varying structure during the reduction process, thus resulting in reduced LPTV systems. Unlike prior LPTV model...
First , we discussed the inner connection between the Error-Correcting Codes (ECC) and the (k, n) Threshold Scheme, then revealed the sufficient and necessary condition and the specific techniques in building the (k, n) Threshold Scheme by (n, k) MDS code; And then we put forward the (k, n) Threshold Scheme based on Two-Dimensional code, gives several important Error-Correcting Codes Threshold Scheme...
We studied the modulation of surface plasmon polariton propagation using electroabsorption in quantum wells by simulation. SPPs propagate along the interface of a thin Au film and InGaAs/InAlAs multiple quantum wells, which are buried in the vicinity of the Au film. The quantum Stark's shift in the reverse biased quantum wells modulates the absorption of the evanescent field of SPPs. The important...
In this paper, the permittivity imaginary part of gain material considered is dispersive, and by this model, the SP laser phenomenon based on a square array of rectangular cavities cut into metal substrate has been investigated. Both of the two main resonant modes of the proposed structure can be used to realize SP laser while the working mechanism is different. We study the origin of these differences,...
This paper presents a study on various signal integrity (SI) issues that could affect signals on Printed Circuit Boards (PCBs). This paper is aimed to analyze and have a better understanding on the nature of signal integrity, how the problem is manifested in PCB designs and what design solutions can be employed to minimize its effects. The PCB designs are modelled using the Advanced Design System...
Nowadays, malicious computer programs have attempted to attack websites, greatly affecting their availability and security. CAPTCHA (Completely Automated Public Turing test to tell Computers and Human Apart) mechanism is an effectual method in solving this problem. The prevailing implementation of CAPTCHA is 2D still image verification code, however, the developing artificial intelligence and image...
Power marketing system plays an important role in customer service marketing management system, because the system involves data sharing and information application concurrently of central departments in power enterprise. It is very difficult for power marketing system to implement information sharing across power enterprise, but creating an information integrated platform to achieve information integration...
In order to distinguish between human users and computer programs, CAPTCHA (completely automated public turing test to tell computers and human apart) mechanism is widely applied in Web sites such as accounts application Web site. While the major implementation of CAPTCHA method-2D still image verification code based on OCR technology is threatened by developing artificial intelligence and image recognition...
A unique feature of oscillators is that small but sustained external perturbations lead to unboundedly large changes in phase, thereby making standard harmonic balance (HB) inapplicable to realistic oscillator phase macromodels. In this paper, we rectify this situation by presenting a novel extension of HB that is capable of handling oscillator phase macro-models. Key to the new method, termed PPV-HB,...
In this paper, the authors present a simple but rigorous nonlinear analysis for understanding and predicting steady-state operation and injection locking in two-port nonlinear negative-resistance oscillators (such as the Colpitts, Pierce, etc., topologies commonly used in RFICs). Key advances of our approach include the use of vector-based nonlinear feedback analysis and treatment of amplitude and...
We present a generalization of standard AC analysis to oscillators by exploiting least-squares solution techniques. This provides an attractive alternative to the current practice of employing transient simulation for small signal analysis of oscillators. Unlike phase condition based oscillator analysis techniques, which suffer from numerical artifacts, the least-squares approach of this paper results...
In this paper, we propose an envelope-following method which is uniformly applicable to both non-autonomous and oscillatory circuits. A key feature of our technique is the use of an efficient minimum least squares solution technique to solve an underdetermined envelope system directly. This leads to a general purpose approach which is much easier to solve than previous phase condition based envelope-following...
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