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1.
The fourth-order partial differential equations have good performance on noise smoothing and edge preservation without creating blocky effects on smooth regions. However, for low signal-to-noise ratio images, the discrimination between edges and noise is a challenging problem. A novel kernel-based fourth-order diffusion is proposed in this paper. It introduces a kernelized gradient operator in the fourth-order diffusion process, which leads to more effective noise removal capability. Experiment results show that this method outperforms several previous anisotropic diffusion methods for noise removal and edge preservation. 相似文献
2.
Chin-Te Chen Wen-Li Lin Te-Son Kuo Cheng-Yi Wang 《IEEE transactions on bio-medical engineering》1997,44(7):601-609
The authors discuss a two-model multilayer neural network controller for adaptive control of mean arterial blood pressure (MABP) using sodium nitroprusside. A model with an autoregressive moving average (ARMA), representing the dynamics of the system, and a modified backpropagation training algorithm are used to design the control system to meet specified objectives of design (settling time and undershoot/overshoot) and clinical constraints. The controller is associated with a weighting-determinant unit (WDU) to determine and update the output weighting factor of the parallel two-model neural network for adequate control action and a control-signal modification unit (CMU) to comply with clinical constraints and to suppress the effect of adverse noise and to improve the WDU performance. Extensive computer simulations indicate satisfactory performance and robustness of the proposed controller in the presence of much noise, over the full range of plant parameters, uncertainties, and large variations of parameters 相似文献
3.
Wei-Hao Chen Chia-Yueh Chou Bao-Jhen Li Shao-Liang Cheng Cheng-Yi Liu 《Journal of the American Ceramic Society》2021,104(12):6579-6588
Columnar wurtzite grains were formed in sputtered ZnO thin films deposited on a plastic polyethylene terephthalate substrate. Selected-area diffraction patterns reveal that the columnar grains in the sputtered films present two preferred growth planes, namely, the basal (0002) and prismatic (100) growth planes. The diffraction patterns obtained also confirm that the microstructure of sputtered indium tin oxide thin films is amorphous in nature. Tensile tests indicate that the fracture strain of the ZnO thin film occurs between 1.73% and 2.14%, while the fracture strain of the indium tin oxide thin film occurs between 0.24% and 0.67%. Thus, the fracture toughness of the sputtered ZnO thin film is greater than that of the sputtered indium tin oxide thin film. High-resolution transmission electron microscopic images demonstrate that edge and screw dislocations could be identified in the sputtered ZnO thin films. Moreover, edge and screw dislocation movements may, respectively, be observed in the basal- and prismatic-oriented ZnO columnar grains of the sputtered ZnO thin films. Our results indicate that movements of the edge and screw dislocations in the basal- and prismatic-oriented ZnO columnar grains account for the plastic deformation of the investigated ZnO thin films under tensile stress. 相似文献
4.
在大规模、数据量密集的特定应用场景下,以行存储访问数据的方式弊端日益凸显,逐渐不能满足数据高速访问的性能需求,数据亟需更加高效的传输和处理方式.因此,拓展新的内存访问方式,并且同时兼容行、列方向的访问对提升访问效率、降低整体功耗、节省内存空间有着重要意义.本文围绕动态随机存储和非易失性存储两个方面来详细介绍实现列方向的内存访问方式,重点分析了存储单元的结构设计以及实现列向存储访问过程.最后,对内存两种不同访问方式进行了比较和总结,并且对行列访问的内存数据库、数据挖掘、数据加密算法、实时系统的应用场景进行了展望. 相似文献
5.
This paper addresses the problem of stability analysis for homogeneous large-scale uncertain bilinear time-delay systems subjected to constrained inputs. Both nonlinear uncertainties and interval systems are discussed. Several delay-independent criteria are presented to guarantee the asymptotic stability of the overall systems. The main feature of the presented criteria is that although the Lyapunov stability theorem is used, they do not involve any Lyapunov equations that may be unsolvable. Three illustrative numerical examples are presented to verify the effectiveness of the proposed stability criteria. 相似文献
6.
7.
Bing-Yuh Lu Win-Li Lin Yung-Yaw Chen Rong-Sen Yang Te-Son Kuo Cheng-Yi Wang 《IEEE engineering in medicine and biology magazine》1999,18(5):106-111
Compared with a single-frequency system, the multiple-frequency system has an additional function to combine power patterns of different frequencies. This function increases the availability of power patterns to treat various shapes and depths of tumors. Therefore, we proposed a system with the ability to drive ultrasonic phased arrays of multiple resonant frequencies for ultrasound hyperthermia 相似文献
8.
土钉支护为一种用于土体开挖和边坡稳定的新型支挡结构,其应用已经拓展到软土地基基坑开挖中,根据工程实际并参照国内外应用研究现状,论述了土钉支护应用在软土地基的设计、施工方法及对策。 相似文献
9.
Characterization of the Ultrathin HfO2 and Hf-Silicate Films Grown by Atomic Layer Deposition 总被引:1,自引:0,他引:1
Tze Chiang Chen Cheng-Yi Peng Chih-Hung Tseng Ming-Han Liao Mei-Hsin Chen Chih-I Wu Ming-Yau Chern Pei-Jer Tzeng Chee Wee Liu 《Electron Devices, IEEE Transactions on》2007,54(4):759-766
The physical properties of HfO2 and Hf-silicate layers grown by the atomic layer chemical vapor deposition are characterized as a function of the Hf concentration and the annealing temperature. The peaks of Fourier transform infrared spectra at 960, 900, and 820 cm-1 originate from Hf-O-Si chemical bonds, revealing that a Hf-silicate interfacial layer began to form at the HfO2/SiO 2 interface after post deposition annealing process at 600 degC for 1 min. Moreover, the intensity of the peak at 750 cm-1 can indicate the degree of crystallization of HfO2. The formed Hf-silicate layer between HfO2 and SiO2 is also confirmed by X-ray photoelectron spectroscopy 相似文献
10.
Chen Cheng-Yi Wu Rong-Ching Tsai Bing-Jyun Hsu Chao-Ming 《Microsystem Technologies》2021,27(4):1019-1030
Microsystem Technologies - Electromagnets are widely used as driving devices in industry. In this article, we describe various designs and methods of analysis for a built-in coil electromagnetic... 相似文献