Time-efficient fault detection and diagnosis system for analog circuits

Time-efficient fault analysis and diagnosis of analog circuits are the most important prerequisites to achieve online health monitoring of electronic equipments, which are involving continuing challenges of ultra-large-scale integration, component tolerance, limited test points but multiple faults. This work reports an FPGA (field programmable gate array)-based analog fault diagnostic system by applying two-dimensional information fusion, two-port network analysis and interval math theory. The proposed system has three advantages over traditional ones. First, it possesses high processing speed and smart circuit size as the embedded algorithms execute parallel on FPGA. Second, the hardware structure has a good compatibility with other diagnostic algorithms. Third, the equipped Ethernet interface enhances its flexibility for remote monitoring and controlling. The experimental results obtained from two realistic example circuits indicate that the proposed methodology had yielded competitive performance in both diagnosis accuracy and time-effectiveness, with about 96% accuracy while within 60 ms computational time.Peer reviewedFinal Published versio

Optimal analog wavelet bases construction using hybrid optimization algorithm

An approach for the construction of optimal analog wavelet bases is presented. First, the definition of an analog wavelet is given. Based on the definition and the least-squares error criterion, a general framework for designing optimal analog wavelet bases is established, which is one of difficult nonlinear constrained optimization problems. Then, to solve this problem, a hybrid algorithm by combining chaotic map particle swarm optimization (CPSO) with local sequential quadratic programming (SQP) is proposed. CPSO is an improved PSO in which the saw tooth chaotic map is used to raise its global search ability. CPSO is a global optimizer to search the estimates of the global solution, while the SQP is employed for the local search and refining the estimates. Benefiting from good global search ability of CPSO and powerful local search ability of SQP, a high-precision global optimum in this problem can be gained. Finally, a series of optimal analog wavelet bases are constructed using the hybrid algorithm. The proposed method is tested for various wavelet bases and the improved performance is compared with previous works.Peer reviewedFinal Published versio

Structure and realization of pole-shared switched-current complex wavelet filter

A pole-shared switched-current complex wavelet filter structure with follow-the-leader feedback configuration is proposed for synthesizing the real and imaginary approximation functions with the same poles. The double-sampling fully-balanced SI bilinear integrator and current mirror are employed as the building cells. By sharing the implementation circuit for approximation poles of the real and the imaginary part, the proposed structure only has the same circuit complexity as that of real-valued wavelet filter, which is very suitable for small-size and low-power application. The complex Morlet wavelet is selected as an example to elaborate the design procedure. Simulation results confirm that the presented complex wavelet filter structure can generate the real and imaginary coefficients of complex wavelet transform accurately with simple synthesis method and explicit design formulas.Peer reviewedFinal Accepted Versio

Real-Time Fault Detection and Diagnosis System for Analog and Mixed-Signal Circuits of Acousto-Magnetic EAS Devices

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The paper discusses fault diagnosis of the electronic circuit board, part of acousto-magnetic electronic article surveillance detection devices. The aim is that the end-user can run the fault diagnosis in real time using a portable FPGA-based platform so as to gain insight into the failures that have occurred.Peer reviewe

Population Growth and Planned Birth Policy

China\u27s planned birth policy is based on \u27population pessimism\u27, which states population growth affects the income level negatively, though the role of population growth in cross-country growth regressions is ambiguous. There are \u27population pessimism\u27, \u27population optimism\u27, and \u27population neutralism\u27. Also, a new concept \u27demographic dividend\u27 was raised in recent years, which states a rise in the rate of economic growth can be induced because of a rising share of working age people in a population while still holding \u27population neutralism\u27. The planned birth policy results in a decreasing fertility rate, which slows down the population growth and changes the age structure of population. In this paper whether population pessimism holds and whether China grasps \u27demographic dividend\u27 are tested. An overlapping generation (OLG) model is developed to introduce the dependency ratio into the growth regression. The claim of demographic dividend and the role of population growth are first examined in the cross-country data and sensitivity analyses are followed for the robustness test. Throughout the sensitivity analyses, dependency ratio is proved to be robust in cross-country growth regressions while still holding \u27population neutralism\u27. Later, using the provincial level data of China the case study on China\u27s planned birth policy is conducted where two instrumental variables, sex ratio at birth and minority proportion, are introduced to handle the endogeneity problems and policy suggestions based on the predicted China\u27s demographic structure are provided

Non-linear Ultrasound Imaging

The theory for modeling non-linear acoustic propagation is addressed in the dissertation. The solutions to both the linear and non-linear wave equations have been found by an angular spectrum approach (ASA), in which an analytical expression can be derived. This makes the calculation complete without iteration steps. The ASA is implemented in combination with Field II and extended to simulate the pulsed ultrasound fields. The simulated results from a linear array transducer are made by the ASA based on Field II, and by a released non-linear simulation program- Abersim, respectively. The calculation speed of the ASA is increased approximately by a factor of 140. For the second harmonic point spread function the error of the full width is 1.5% at -6 dB and 6.4% at -12 dB compared to Abersim. To further investigate the linear and non-linear ultrasound fields, hydrophone measurements are performed under water by two geometrical focused piston transducers. It can be seen that the time pulses measured from a 0.5 inch diameter transducer and linearly simulated using the ASA are fairly comparable. The root mean square (RMS) error for the second harmonic field simulated by the ASA is 10.3% relative to the measurement from a 1 inch diameter transducer. A preliminary study for harmonic imaging using synthetic aperture sequential beamforming (SASB) has been demonstrated. A wire phantom underwater measurement is made by an experimental synthetic aperture real-time ultrasound scanner (SARUS) with a linear array transducer. The second harmonic imaging is obtained by a pulse inversion technique. The received data is beamformed by the SASB using a Beamformation Toolbox. In the measurements the lateral resolution at -6 dB is improved by 66% compared to the conventional imaging algorithm. There is also a 35% improvement for the lateral resolution at -6 dB compared with the sole harmonic imaging and a 46% improvement compared with merely using the SASB

How to Promote In-Game Advertising based on User Experience Design

Pretty much time we mentioned in-game advertising it always comes out with firmly against from players, but there is another voice from the game industry, JJ Richards of Massive, says that if done correctly it can not only work but enhance the overall experiences. There is also a company Tag. Which targets brand advertisers who want to get noticed by gamers without interrupting gameplay sessions, has raised 3.2 million dollars in funding. Moreover, it is expected to have over 25 million users by June 2012, according to its' board of directors, Jeffrey Lapin. In-game ads have already got noticed by many publishers and advertisers, and some games have applied the rules of advertising from the music industry and film industry into the game industry. This research is going to have a look at these existing cases and analysis them to conclude an effective way to promote advertisement without interpreting the user experiences. In terms of the methodology part, it will use netography to examine the model created, referring to the analysis of these existing cases in the game industry. The method of netography will be divided into five branches, starting with research planning, it should introduce the essential industry background and compare the advertising market between old media industry, like the film industry. It has many similar principles of the film industry, which could also be used in the game industry. Assembling these principles and examine them in games will help to improve the understanding of user experiences. It is also a good example based on to inspire innovative methods to promote advertisement in games without interpreting user experiences. Following with the entrée of the whole analysis, this part includes examples use in-game ads quite successful, its in-game ads type and its users would be the focal point of the case study. Also, it will use the referring articles of this game preview and analysis online to picture an overall impression of this example. Then the data collection is going to be an essential part of the whole research. It should give substantial shreds of evidence to support the results come out next.  These numbers will help to analysis the user experiences with in-game ads. The interpretation is highly linked to the former part of the analysis. It will give advice and comments based on the analysis of these data collected. The research results of netography analysis are based on the analysis step by step from plan to ensuring ethical standards. The rules from the results are going to be examined again by building a game designing model with in-game ads, and questionnaires will gain feedback about the design. This design document will be formed by analysis of target users, target advertising product and different in-game ads promoting technology applied research and test. At last, the feedback of this model will be compared to the existing examples in the market, giving more advice and indicate the trend of this market in the future, according to the feedbacks. Keywords: In-game advertising, netnography, 2K, user experience, recall rate. DOI: 10.7176/ADS/74-06 Publication date:July 31st 201