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991.
992.
该文以家庭电器和灯光智能化控制等方面的需求为例,介绍一种以JZ863为数据传输模块,基于89C2051单片机设计的无线遥控电路设计方案。与编码电路芯片设计的遥控电路相比,外围电路简单,功耗低,编程容易,可靠性高,扩展功能强。 相似文献
993.
设计并实现了一种基于无线收发器芯片CCll01的测控网络,简要介绍了网络中链路层协议的工作机制及相应硬件电路设计;详细分析了使用CCll01进行无线通信时的节能设计和防冲突设计原理,计算并给出了CCll01的有关内部寄存器的取值,同时也说明了使用PIC单片机PICl8F66J60进行局域网互连的软硬件设计方法;介绍了最终系统的实现情况及应用前景。 相似文献
994.
This paper presents a backstepping control method using radial‐basis‐function neural network (RBFNN) for improving trajectory tracking performance of a robotic helicopter. Many well‐known nonlinear controllers for robotic helicopters have been constructed based on the approximate dynamic model in which the coupling effect is neglected; their qualitative behavior must be further analyzed to ensure that the unmodeled dynamics do not destroy the stability of the closed‐loop system. In order to improve the controller design process, the proposed controller is developed based on the complete dynamic model of robotic helicopters by using an RBFNN function approximation to the neglected dynamic uncertainties, and then proving that all the trajectory tracking error variables are globally ultimately bounded and converge to a neighborhood of the origin. The merits of the proposal controller are exemplified by four numerical simulations, showing that the proposed controller outperforms a well‐known controller in (J. Robust Nonlinear Control 2004; 14 (12):1035–1059). Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
995.
Performance Evaluation of Dynamic Speculative Multithreading with the Cascadia Architecture 总被引:1,自引:0,他引:1
Thread-level parallelism (TLP) has been extensively studied in order to overcome the limitations of exploiting instruction-level parallelism (ILP) on high-performance superscalar processors. One promising method of exploiting TLP is Dynamic Speculative Multithreading (D-SpMT), which extracts multiple threads from a sequential program without compiler support or instruction set extensions. This paper introduces Cascadia, a D-SpMT multicore architecture that provides multigrain thread-level support and is used to evaluate the performance of several benchmarks. Cascadia applies a unique sustainable IPC (sIPC) metric on a comprehensive loop tree to select the best performing nested loop level to multithread. This paper also discusses the relationships that loops have on one another, in particular, how loop nesting levels can be extended through procedures. In addition, a detailed study is provided on the effects that thread granularity and interthread dependencies have on the entire system. 相似文献
996.
This paper investigates robust observer‐controller compensator design using Vidyasagar's structure (VS). VS has a unit matrix parameter H similar to the Q parameter for the Youla–Kucera parameterization. VS can be designed based on the left coprimeness of the central controller in the H∞‐loop shaping design procedure (H∞‐LSDP) and therefore can preserve the intrinsic properties of the H∞‐LSDP. This paper introduces algebraic methods to simplify the design of H in the VS controller by solving specific algebraic equations. In particular, the algebraic design of H can achieve two things. First, a dynamic H adjusts the tracking performance and yields the integral action. Second, a dynamic H rejects the input and output sinusoidal disturbances with known frequencies. These attributes are indications of the flexibility of the proposed method since the output‐feedback controller design of the H∞‐LSDP cannot easily deal with such conditions. This paper discusses the achieved loop and the closed‐loop behavior of the system with VS, and also gives two numerical examples. The first example shows that the proposed method results in a better design in many aspects than the resulting from H∞‐LSDP. The second example shows the application of the proposed method to rejecting input and output step disturbances, and input and output multiple sinusoidal disturbances, for which the H∞‐LSDP can hardly be used. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
997.
Data hiding technique can facilitate security and the safe transmission of important information in the digital domain, which generally requires a high embedding payload and good stego image quality. Recently, a steganographic framework known as wet paper coding has been utilized as an effective strategy in image hiding to achieve the requirements of high embedding payload, good quality and robust security. In this paper, besides employing this mechanism as a fundamental stage, we take advantage of two novel techniques, namely, an efficient n-indicator and a fuzzy edge detector. The first is to increase the robustness of the proposed system to guard against being detected or traced by the statistics methods while allowing the receiver without knowledge of secret data positions to retrieve the embedded information. The second is to improve the payload and enhance the quality of stego image. The experimental results show that our proposed scheme outperforms its ability to reduce the conflict among three steganography requirements. 相似文献
998.
Ken C. K. Lee Wang-Chien Lee Baihua Zheng Huajing Li Yuan Tian 《The VLDB Journal The International Journal on Very Large Data Bases》2010,19(3):333-362
Given a set of data points in a multidimensional space, a skyline query retrieves those data points that are not dominated by any other point in the same dataset. Observing that the properties of Z-order space filling curves (or Z-order curves)
perfectly match with the dominance relationships among data points in a geometrical data space, we, in this paper, develop
and present a novel and efficient processing framework to evaluate skyline queries and their variants, and to support skyline
result updates based on Z-order curves. This framework consists of ZBtree, i.e., an index structure to organize a source dataset and skyline candidates, and a suite of algorithms, namely, (1) ZSearch, which processes skyline queries, (2) ZInsert, ZDelete and ZUpdate, which incrementally maintain skyline results in presence of source dataset updates, (3) ZBand, which answers skyband queries, (4) ZRank, which returns top-ranked skyline points, (5) k-ZSearch, which evaluates k-dominant skyline queries, and (6) ZSubspace, which supports skyline queries on a subset of dimensions. While derived upon coherent ideas and concepts, our approaches
are shown to outperform the state-of-the-art algorithms that are specialized to address particular skyline problems, especially
when a large number of skyline points are resulted, via comprehensive experiments. 相似文献
999.
Musun Kwak Hanrok Chung Hyukmin Kwon Daekyung Han Yoonsun Yi Jongho Jeon Sangmun Lee Chulgu Lee Sooyeol Cha 《Journal of the Society for Information Display》2010,18(12):1072-1077
Abstract— The surface‐friction characteristics of the post‐bake temperature were compared to that of the rubbing condition on VA‐mode alignment films (AFs) using frictional force microscopy (FFM). The surface roughness and the surface frictional force increased when the temperature was elevated. However, the frictional asymmetry could not be detected by the frictional loop due to the instability of the side‐chain molecular arrangement. For the inter‐influences of the total friction and surface roughness, the density of the side chain was changed and it was intentionally rubbed for evaluation. The results showed that the total friction was higher when the rubbing was stronger and side‐chain density lower, and the surface roughness also increased in the same manner. This can be explained by the potential interaction due to the curved structure of the side‐chain surface that establishes the probe that is scanned and the top surface layer. In order to confirm the influence of the pre‐tilt angle on the tilt of the side chain, a test cell was produced under the same conditions and evaluated. The results showed that the pre‐tilt‐angle decreased according to the difference in density of the side chain and strength of rubbing after injecting liquid‐crystal (LC). 相似文献
1000.
Abstract— High‐efficiency and simple‐structured red‐emitting phosphorescent devices based on the hole‐injection layer of 4,4′,4″‐tris(2‐naphthylphenyl‐phenylamino)‐triphenylamine [2‐TNATA] and the emissive layer of bis(10‐hydroxybenzo[h] quinolinato)beryllium complex [Bebq2] doped with SFC‐411 (proprietary red phosphorescent dye) have been researched. The fabricated devices are divided into three types depending on whether or not the hole‐transport layer of N,N′‐bis(1 ‐naphthyl)‐N, N'‐diphenyl‐1,1′‐biphenyl‐4,4′‐diamine [NPB] or the electron‐transport layer of SFC‐137 (proprietary electron transporting material) is included. Among the experimental devices, the best electroluminescent characteristics were obtained for the device with an emission structure of 2‐TNATA/Bebq2:SFC‐411/SFC‐137. In this device, current density and luminance were found to be 200 mA/cm2 and 15,000 cd/m2 at an applied voltage of 7 V, respectively. Current efficiencies were 15 and 11.6 cd/A under a luminance of 500 and 5000 cd/m2. The peak wavelength in the electroluminescent spectral distribution and color coordinates on the Commission Internationale de I'Eclairage (CIE) chart were 628 nm and (0.67, 0.33), respectively. 相似文献