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81.
Andy C. Yau N. K. Bose Michael K. Ng 《Multidimensional Systems and Signal Processing》2007,18(2-3):173-188
In this paper, we study the problem of reconstruction of a high-resolution (HR) image from several blurred low-resolution
(LR) image frames in medium field. The image frames consist of blurred, decimated, and noisy versions of a HR image. The HR
image is modeled as a Markov random field (MRF), and a maximum a posteriori (MAP) estimation technique is used for the restoration.
We show that with the periodic boundary condition, a HR image can be restored efficiently by using fast Fourier transforms.
We also apply the preconditioned conjugate gradient method to restore HR images in the aperiodic boundary condition. Computer
simulations are given to illustrate the effectiveness of the proposed approach.
This research was conducted with support from the Army Research Office Grant DAAD 19-03-1-0261 and the National Science Foundation
Grant CCF-0429481.
Research supported in part by RGC Grant Nos. 7130/02P, 7046/03P, 7035/04P and 7035/04P and FRG/04-05/II-51. 相似文献
82.
In this paper, we seek to provide a systematic anti-windup control synthesis approach for systems with actuator saturation within a linear parameter-varying (LPV) design framework. The closed-loop induced L2 gain control problem is considered. Different from conventional two-step anti-windup design approaches, the proposed scheme directly utilizes saturation indicator parameters to schedule accordingly the parameter-varying controller. Hence, the synthesis conditions are formulated in terms of linear matrix inequalities (LMIs) that can be solved very efficiently. The resulting gain-scheduled controller is non-linear in general and would lead to graceful performance degradation in the presence of actuator saturation non-linearities and linear performance recovery. An aircraft longitudinal dynamics control problem with two input saturation non-linearities is used to demonstrate the effectiveness of the proposed LPV anti-windup scheme. 相似文献
83.
智能屏幕人机界面的开发人员通过使用闪存和C/C++组件,使产品达到了工业级的可靠性和实时性能。楼宇自动化系统的设计便是一个例子。 相似文献
84.
85.
Undocumented assumptions are often the cause of serious software system failure. Thus, to reduce such failures, developers must become better at discovering and documenting their assumptions. In this article, we focus on common categories of assumptions in software, discuss methods for recognizing when developers are making them, and recommend techniques for documenting them. 相似文献
86.
Walter A. Wohlmuth Bill Davenport Tyler Bowman Pat Hamilton Robert Hallgren Frederick S. Pool Andy Turudic 《Solid-state electronics》2005,49(12):1978
GaAs MESFETs with novel lowly-doped drain structures have been developed utilizing molecular implants of silicon trifluoride. Short-channel effects in the 1/4 μm enhancement- and depletion-mode transistors have been suppressed with drain-induced barrier height lowering of less than 70 mV/V and pinch-off voltage shifts of less than 220 mV as the gate length was scaled from 1.0 to 1/4 μm. The 3-terminal breakdown, the transconductance to output conductance ratio, and the unity current gain, cut-off frequency were simultaneously optimized. The E-mode device possessed breakdown of >10 V, Gm · Rds > 9.5, Ft > 55 GHz, and nominal on-resistance of 2.1 Ω mm while the D-mode device had breakdown >10 V, Gm · Rds > 6.0, Ft > 45 GHz, and nominal on-resistance of 1.9 Ω mm. These optimized transistors enabled the realization of a variety of low-power digital and high-power mixed signal circuits, using 3-level source-coupled transistor and common-mode logic, such as laser and electro-optic drivers, highly integrated transceivers, multiplexers, demultiplexers, and clock data recover circuits. 相似文献
87.
Andy Rowe 《Housing Studies》1989,4(2):75-91
Self‐help has been a neglected aspect of housing provision in industrialised nations, yet in many locations it accounts for a significant share of new production and can contribute to improved housing circumstances for those whose housing need is not too severe. This paper discusses self‐help housing provision in Atlantic Canada and argues that it reduces the profitability of the residential construction industry and for this and other reasons, self‐help is likely to continue as a major form of production. This paper also evaluates the impact on self‐help of several housing policy options. 相似文献
88.
In Minimum Error Rate Training (MERT), Bleu is often used as the error function, despite the fact that it has been shown to have a lower correlation with human judgment
than other metrics such as Meteor and Ter. In this paper, we present empirical results in which parameters tuned on Bleu may lead to sub-optimal Bleu scores under certain data conditions. Such scores can be improved significantly by tuning on an entirely different metric
altogether, e.g. Meteor, by 0.0082 Bleu or 3.38% relative improvement on the WMT08 English–French data. We analyze the influence of the number of references and
choice of metrics on the result of MERT and experiment on different data sets. We show the problems of tuning on a metric
that is not designed for the single reference scenario and point out some possible solutions. 相似文献
89.
Andy:大家好,我是Andy Plata。
Julie:我是Julie Plata。很高兴今天能在这里为大家演讲。我和Andy共同拥有一些服务于全球印刷业的公司。我们也为全球许多印刷类刊物撰文,我想诸位应该已经读过我们在科印传媒《数码印刷》杂志上发表的文章。 相似文献
90.
Aiwina Heng Sheng Zhang Andy C.C. Tan Joseph Mathew 《Mechanical Systems and Signal Processing》2009,23(3):724-739
Machinery prognosis is the forecast of the remaining operational life, future condition, or probability of reliable operation of an equipment based on the acquired condition monitoring data. This approach to modern maintenance practice promises to reduce downtime, spares inventory, maintenance costs, and safety hazards. Given the significance of prognostics capabilities and the maturity of condition monitoring technology, there have been an increasing number of publications on rotating machinery prognostics in the past few years. These publications covered a wide spectrum of prognostics techniques. This review article first synthesises and places these individual pieces of information in context, while identifying their merits and weaknesses. It then discusses the identified challenges, and in doing so, alerts researchers to opportunities for conducting advanced research in the field. Current methods for predicting rotating machinery failures are summarised and classified as conventional reliability models, condition-based prognostics models and models integrating reliability and prognostics. Areas in need of development or improvement include the integration of condition monitoring and reliability, utilisation of incomplete trending data, consideration of effects from maintenance actions and variable operating conditions, derivation of the non-linear relationship between measured data and actual asset health, consideration of failure interactions, practicability of requirements and assumptions, as well as development of performance evaluation frameworks. 相似文献