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81.
This work is concerned with the dynamic behavior of laminated beam, plate and shell structures consisting of a viscoelastic
damping layer constrained between two structural layers. Finite element models for modal, harmonic and transient analyses
are developed. The dynamic interlaminar shear stresses are determined and presented under harmonic and transient loads. The
effect of the damping ratio of the viscoelastic material is investigated. It is found that the viscoelastic material damping
reduces the interlaminar stresses. The results also show the dependency of the viscoelastic material on frequency, hence,
the effect of the viscoelastic material appears significantly under harmonic loading. In transient analysis, the importance
of the viscoelastic material is observed in absorbing the impact and returning the structure to its original configuration. 相似文献
82.
Ferraris Davide Bastos Daniel Fernandez-Gago Carmen El-Moussa Fadi 《International Journal of Information Security》2021,20(4):571-587
International Journal of Information Security - Nowadays, smart home devices like Amazon Echo and Google Home have reached mainstream popularity. Being in the homes of users, these devices are... 相似文献
83.
Machine Intelligence Research - Users on the Internet usually require venues to provide better purchasing recommendations. This can be provided by a reputation system that processes ratings to... 相似文献
84.
Numerous VLSI architectures for 2-D discrete wavelet transform (DWT) have been brought forward. While most of the designs
displayed good performance through parallel processing, few of them addressed thoroughly how to sustain such high throughput
computing which is crucial in real-time applications. Although the affordable data transfer bandwidth has been increased tremendously
during the past decade, the pressure on data communication has not yet been relieved from stream-intensive applications. The
design of 2-D DWT belongs to such cases. In this paper, we expose the performance gap between the computing core and the entire
system, distinguishing them by quantitative approach with metrics of peak performance and mean-time performance. In order
to narrow down the discrepancy without degrading either of the two criteria, on the one hand, we introduce a software-pipelining lifting-based computing kernel to remove data dependence for peak performance, on the other hand, we apply loop fusing technique
and a hierarchical pipelining method to enhance data locality and boost the mean-time performance. The architecture has been
implemented in Xilinx Virtex-II FPGA, taking advantage of Virtex-II’s embedded multipliers and block RAMs. We use Daubechies
(9, 7) and LeGall (5, 3) filters (the default lossy and lossless filters in JPEG2000) for illustration whereas it is a general
method for other DWT filters. The post-place and routing operation frequency for Daubechies (9, 7) is 138 MHz. Notably, the
mean-time performance parameterized by image size and decomposition level achieves closely to peak performance.
Chunhui Zhang received his B.S. degree in Electronic Engineering and his M.S. degree in Microelectronics both from Tsinghua University, Beijing, China, in 1998 and 2001 respectively. He completed his Ph.D. in Electrical and Computer Enginnering from the University of California, Irvine. In 2005, he joined Intel in the Mobile Wireless Communication Group. His research interests include VLSI architectures and algorithms for signal processing, reconfigurable computing, and memory access optimization for multimedia systems. Yun Long received B.S. in 1997 and M.S. in 2001, both in Electronic Engineering from Tsinghua University, China. While pursuing Ph.D. degree in Dept. of EECS, UC-Irvine, he is working with nVidia corp., Santa Clara, CA, on ASIC design and verification. His research interest includes high performance application specific system design, reconfigurable architecture, and data scheduling optimization, especially on multimedia applications. Fadi Kurdahi received his PhD from the University of Southern California in 1987. Since then, he has been a faculty at the Department of Electrical& Computer Engineering at UCI, where he conducts research in the areas of Computer Aided Design of VLSI circuits, high-level synthesis, and design methodology of large scale systems. He was Associate Editor for IEEE Transactions on Circuits and Systems II 1993–1995, Area Editor in IEEE Design and Test for reconfigurable computing, and served as program chair, general chair or on program committees of several workshops, symposia and conferences in the area of CAD, VLSI, and system design. He received the best paper award for the IEEE Transactions on VLSI in 2002, the best paper award at ISQED in 2006, and three distinguished paper awards. He is a Fellow of the IEEE. 相似文献
Chunhui ZhangEmail: |
Chunhui Zhang received his B.S. degree in Electronic Engineering and his M.S. degree in Microelectronics both from Tsinghua University, Beijing, China, in 1998 and 2001 respectively. He completed his Ph.D. in Electrical and Computer Enginnering from the University of California, Irvine. In 2005, he joined Intel in the Mobile Wireless Communication Group. His research interests include VLSI architectures and algorithms for signal processing, reconfigurable computing, and memory access optimization for multimedia systems. Yun Long received B.S. in 1997 and M.S. in 2001, both in Electronic Engineering from Tsinghua University, China. While pursuing Ph.D. degree in Dept. of EECS, UC-Irvine, he is working with nVidia corp., Santa Clara, CA, on ASIC design and verification. His research interest includes high performance application specific system design, reconfigurable architecture, and data scheduling optimization, especially on multimedia applications. Fadi Kurdahi received his PhD from the University of Southern California in 1987. Since then, he has been a faculty at the Department of Electrical& Computer Engineering at UCI, where he conducts research in the areas of Computer Aided Design of VLSI circuits, high-level synthesis, and design methodology of large scale systems. He was Associate Editor for IEEE Transactions on Circuits and Systems II 1993–1995, Area Editor in IEEE Design and Test for reconfigurable computing, and served as program chair, general chair or on program committees of several workshops, symposia and conferences in the area of CAD, VLSI, and system design. He received the best paper award for the IEEE Transactions on VLSI in 2002, the best paper award at ISQED in 2006, and three distinguished paper awards. He is a Fellow of the IEEE. 相似文献
85.
Fadi A. Fathallah 《Applied ergonomics》2010,41(6):738-743
This paper gives an overview of the extent of musculoskeletal disorders (MSDs) in agriculture, and a historical perspective on how ergonomics has been used to reduce the health effects of labor-intensive agriculture. A summary of exposure to MSD physical risk factors within various classes of crops, along with various administrative and engineering controls for abating MSDs in agriculture is given. These controls range from programmed rest breaks to mechanized or partially-mechanized operations. Worker-based approaches such as prone carts and platforms, and load transfer devices hold promise in combating the prevalent stooped work in agriculture. Including the worker as an integral contributor to all aspects of developing and implementing an intervention, and considering the psychosocial and socio-cultural aspects of the work environment are crucial elements of effective interventions for reducing MSDs. Despite the advent progress in new technologies in agricultural practices, reliance on labor, especially in fresh market fruits and vegetables, will always be a major cornerstone of agriculture for at least the foreseen future. It is encouraging to see the increased interest among health and safety professionals, epidemiologists, engineers, social scientists, and ergonomists throughout the world who are committed to the plight of reducing MSDs and other health problems among agricultural workers. 相似文献
86.
This paper presents the derivation of an analytical model for a multi-queue nodes network router, which is referred to as
the multi-queue nodes (mQN) model. In this model, expressions are derived to calculate two performance metrics, namely, the queue node and system
utilization factors. In order to demonstrate the flexibility and effectiveness of the mQN model in analyzing the performance of an mQN network router, two scenarios are performed. These scenarios investigated the variation of queue nodes and system utilization
factors against queue nodes dropping probability for various system sizes and packets arrival routing probabilities. The performed
scenarios demonstrated that the mQN analytical model is more flexible and effective when compared with experimental tests and computer simulations in assessing
the performance of an mQN network router. 相似文献
87.
Laura Kuehlewein Ditta Zobor Katarina Stingl Melanie Kempf Fadi Nasser Antje Bernd Saskia Biskup Frans P.M. Cremers Muhammad Imran Khan Pascale Mazzola Karin Schferhoff Tilman Heinrich Tobias B. Haack Bernd Wissinger Eberhart Zrenner Nicole Weisschuh Susanne Kohl 《International journal of molecular sciences》2021,22(5)
In this retrospective, longitudinal, observational cohort study, we investigated the phenotypic and genotypic features of retinitis pigmentosa associated with variants in the PDE6B gene. Patients underwent clinical examination and genetic testing at a single tertiary referral center, including best-corrected visual acuity (BCVA), kinetic visual field (VF), full-field electroretinography, full-field stimulus threshold, spectral domain optical coherence tomography, and fundus autofluorescence imaging. The genetic testing comprised candidate gene sequencing, inherited retinal disease gene panel sequencing, whole-genome sequencing, and testing for familial variants by Sanger sequencing. Twenty-four patients with mutations in PDE6B from 21 families were included in the study (mean age at the first visit: 32.1 ± 13.5 years). The majority of variants were putative splicing defects (8/23) and missense (7/23) mutations. Seventy-nine percent (38/48) of eyes had no visual acuity impairment at the first visit. Visual acuity impairment was mild in 4% (2/48), moderate in 13% (6/48), and severe in 4% (2/48). BCVA was symmetrical in the right and left eyes. The kinetic VF measurements were highly symmetrical in the right and left eyes, as was the horizontal ellipsoid zone (EZ) width. Regarding the genetic findings, 43% of the PDE6B variants found in our patients were novel. Thus, this study contributed substantially to the PDE6B mutation spectrum. The visual acuity impairment was mild in 83% of eyes, providing a window of opportunity for investigational new drugs. The EZ width was reduced in all patients and was highly symmetric between the eyes, making it a promising outcome measure. We expect these findings to have implications on the design of future PDE6B-related retinitis pigmentosa (RP) clinical trials. 相似文献
88.
Alenizi Farhan Kurdahi Fadi Eltawil Ahmed M. Al-Asmari Awad Kh. 《Multimedia Tools and Applications》2019,78(11):14511-14547
Multimedia Tools and Applications - This paper proposes a hybrid pyramid Discrete-Wavelet-Transform (DWT) Singular-Value-Decomposition (SVD) data hiding scheme for video authentication and... 相似文献
89.
Hashir Karim Kidwai Fadi N. Sibai Tamer Rabie 《通讯和计算机》2009,6(3):1-8
The IBM Cell Broadband Engine (BE) simulator simulates parallel execution of programs on a state-of-the-art 9-core Cell processor model. In this paper, we report our experience with implementing, simulation, and analyzing the performance of image processing applications on the IBM Cell Broadband Engine Simulator measured on the IBM Cell We report the performance simulator for PPE-only and embedded applications, and with various input data file sizes or numbers of SPEs enabled. The simulator results indicate that Cell BE processor can outperform modern single-core RISC processors in orders of magnitude on SIMD compute intensive applications such as edge detection. We also explore different features and development processes available on the simulator. Different techniques for obtaining accurate results (close to real hardware result) are also explored. 相似文献
90.
The ability to detect and track human heads and faces in video sequences can be considered as the finest level of any video surveillance system. In this paper, we introduce a general framework for evaluating our recent appearance-based 3D face tracker using dense 3D data. This tracker combines online appearance models with an image registration technique and can run in real-time and is drift insensitive. More precisely, accuracy and usability of this developed tracker are assessed using stereo-based range facial data from which ground truth 3D motions are computed. This evaluation quantifies the monocular tracker accuracy, and identifies its working range in 3D space. Additionally, this evaluation gives some hints on how the tracker can be fully exploited. 相似文献