现代电子技术与计算机应用研究

本文概述了现代电子技术理论,它是基于控制,电子和电源的相关知识,其应用渗透到人们生活和生产的方方面面.阐述了电子技术的应用原则,如选择过程中的简化原理,规范使用原则,在维护工作中注意细节等.分析了现代电子技术与计算机的实际应用,包含了在农业生产中的应用、企业自动化控制中的应用、机电一体化中的应用、人工智能中的应用等.     

区间分析及其在参数估计中的应用

对区间分析及其在系统参数估计中的应用进行了综述.首先分析了使用区间分析进行参数估计的原因,进而对区间分析理论进行了简介,然后对区间分析在常规参数估计方面的应用和未知但有界误差参数估计方面的应用(包括在线性系统参数估计中的应用和在非线性系统参数估计中的应用)进行了综述,最后进行了总结和展望.     

计算机数据库系统在信息管理中的应用

随着科学技术的快速发展,计算机技术得到飞速的提升,并且应用广泛.计算机数据库系统在信息管理方面应用广泛,其提高了信息管理系统的时效性.本文分析了计算机数据库系统的优势,进而描述了计算机数据库系统在信息管理中的应用现状,提出如何进一步加强计算机数据库系统在信息管理中的应用.     

区间分析及其在参数估计中的应用

对区间分析及其在系统参数估计中的应用进行了综述.首先分析了使用区间分析进行参数估计的原因,进而对区间分析理论进行了简介,然后对区间分析在常规参数估计方面的应用和未知但有界误差参数估计方面的应用(包括在线性系统参数估计中的应用和在非线性系统参数估计中的应用)进行了综述,最后进行了总结和展望.     

DirectDrive技术及其在耳机放大器中的应用设计

介绍了Maxim公司的DirectDrive技术及其在MAX9754耳机放大器中的应用,同时通过应用实例给出了DirectDrive技术在应用设计中的注意事项.     

物联网技术在环境监测领域中的应用

随着我国信息化进程的不断加快以及社会经济的不断发展,物联网技术被应用在日常生活中的各个领域,如在环境监测方面的应用,优势十分明显.本文对物联网技术在环境监测领域中的应用进行了研究.     

自动化技术在电子信息工程中的分析

随着科学技术的全面发展,自动化技术在电子信息工程中的应用十分重要.在实际的应用过程中,其需要对自动化技术体系进行整体性的优化.本文主要针对自动化技术在电子信息工程中的应用进行分析,并提出了相应的优化措施.     

单片机在智能仪器仪表中的应用

单片机是一种结构简单、技术先进、功能多元化的"微型计算机".本文主要探讨了单片机在智能化仪器仪表中的应用.首先介绍了单片机在智能化仪器仪表中的应用意义,接着分析了应用单片机的智能化仪器仪表的具体功能、分类、特点,然后进一步探讨了单片机的应用要点.     

虚拟技术在江苏电视台靓妆频道直播节目中的应用

本文介绍了虚拟技术在直播节目中的应用,阐述了虚拟技术在实际应用中的一些心得和体会.     

分布式光纤测温系统在石油测井中的应用

重点论述了观察井测温在油田开采中的重要性和所面临的问题,介绍了分布式光纤温度传感(DTS)技术原理以及在油田温度监测中的应用.最后展望了光纤分布式测温传感器在油田测试中的应用前景.     

User assisted disparity remapping for stereo images

This study concentrates on user assisted disparity remapping for stereo image footage, i.e. the disparity of an object of interest is altered while leaving the remaining scene unattended. This application is useful in the sense that it provides a method for emphasizing/de-emphasizing an object on the scene by adjusting its depth with respect to the camera. The proposed technique can also be used as a post-processing step for retargeting stereoscopic footage on different display sizes and resolutions. The proposed technique involves an MRF-based energy minimization step for interactive stereo image segmentation, for which user assistance on only one of the stereo pairs is required for determining the location of stereo object pair. A key contribution of the proposed study is elimination of dense disparity estimation step from the pipeline. This step is realized through a sparse feature matching technique between the stereo pairs. Moreover, by the help of the proposed technique, novel disparity adjusted views are synthesized using the produced stereo object segments and background information for the images. Qualitative and quantitative evaluation of the generated segments and the disparity adjusted images prove the functionality and superiority of the proposed technique.     

采用变速白光扫描干涉术测量大尺度台阶结构

针对传统白光扫描干涉术在对一些垂直尺度较大器件的测试中,存在测量时间长、信号利用率低等问题,本文提出了应用于白光扫描干涉测量的变速扫描策略,并开发了基于预定义模式的变速扫描和基于自动对焦模式的变速扫描两种具体的实现方式。本文方法能够控制测量系统仅在有干涉条纹存在的空间区域采集图像,而在其它区域加速运行,从而提高了测试效率。测量过程中,通过编写的测量软件控制纳米测量机(NMM),并利用NMM的高精度定位能力实现变速扫描。实验测试了一个100μm台阶结构,相对传统固定步长扫描法,变速扫描在保持高精度的基础上提高了测量效率。     

Block-based fuzzy step size nlms algorithms for subband adaptive channel equalisation

Judicious selection of the step size parameter is crucial for adaptive algorithms to strike a good balance between convergence speed and misadjustment. The fuzzy step size (FSS) technique has been shown to improve the performance of the classical fixed step size and variable step size (VSS) normalised least mean square (NLMS) algorithms. The performance of the FSS technique in the context of subband adaptive equalisation is analysed and two novel block-based fuzzy step size (BFSS) strategies for the NLMS algorithm, namely fixed block fuzzy step size (FBFSS) and adaptive block fuzzy step size (ABFSS) are proposed. By exploiting the nature of gradient noise inherent in stochastic gradient algorithms, these strategies are shown to substantially reduce the computational complexity of the conventional FSS technique without sacrificing the convergence speed and steady-state performance. Instead of updating the step size at every iteration, the proposed techniques adjust the step size based on the instantaneous squared error once over a block length. Design methodology and guidelines that lead to good performance for the algorithms are given.     

大容量并联型有源电力滤波器的软启动技术

分析大容量并联型有源电力滤波器的系统模型和工作特点的基础上,提出了大容量并联型有源电力滤波器软启动的方法。电流环软启动通过输出电流指令递增实现,电压环软启动则比较了直流侧电压指令逐步升高法、恒定电流充电法、变PI参数调节法三种策略。实验结果表明并联型有源电力滤波器投入电网时直流侧电压上升平稳无超调,输出电流也无冲击现象,证明此软启动方法是有效的。     

多晶硅薄膜的两步激光晶化技术

采用两步激光晶化技术获得了多晶硅薄膜，分析计算了激光晶化时薄膜中的温度分布及表面温度与激光功率密度的关系，利用计算结果并优化了激光晶化时的工艺参数，采用该技术制备了性能优良的顶栅多晶硅薄膜晶体管，测量了薄膜晶体管的转移特性与输入输出特性，从多晶硅薄膜的制备工艺上分析了提高薄膜晶体管性能的原因。     

Automatic detection of brain contours in MRI data sets

A software procedure is presented for fully automated detection of brain contours from single-echo 3-D MRI data, developed initially for scans with coronal orientation. The procedure detects structures in a head data volume in a hierarchical fashion. Automatic detection starts with a histogram-based thresholding step, whenever necessary preceded by an image intensity correction procedure. This step is followed by a morphological procedure which refines the binary threshold mask images. Anatomical knowledge, essential for the discrimination between desired and undesired structures, is implemented in this step through a sequence of conventional and novel morphological operations, using 2-D and 3-D operations. A final step of the procedure performs overlap tests on candidate brain regions of interest in neighboring slice images to propagate coherent 2-D brain masks through the third dimension. Results are presented for test runs of the procedure on 23 coronal whole-brain data sets, and one sagittal whole-brain data set. Finally, the potential of the technique for generalization to other problems is discussed, as well as limitations of the technique     

Practical method for the determination of time step innon-orthogonal FDTD

The non-orthogonal FDTD algorithm is well-suited to the modelling of curved structures, although users of the technique frequently have difficulty determining an appropriate time step for the algorithm. A new method which is shown to be both a practical and reliable technique for determining the time step is presented     

基于逻辑操作和符号数字表达的光学并行负二进制运算

研究了光学负二进制并行算术运算。基于符号数字负二进制表达，提出了任意字长操作数的并行两步加法与一步减法。这些基本运算都可通过空间编码与解码的光学逻辑实现，从而提供了一种有效的光学算术－逻辑单元（ＡＬＵ）设计方案。     

Macro pipelining based scheduling on high performance heterogeneousmultiprocessor systems

Presents a technique for pipelining heterogeneous multiprocessor systems, macro pipelining based scheduling. The problem can be identified as a combination of optimal task/processor assignment to pipeline stages as well as a scheduling problem. The authors propose a new technique based on iterative applications of partitioning and scheduling schemes whereby the number of pipeline stages are identified and the scheduling problem is solved. The pipeline cycle is optimized in two steps. The first step finds a global coarse solution using the ratio cut partitioning technique. This is subsequently improved by the iterative architecture driven partitioning and the repartitioning and time axis relabeling techniques of the second step. The authors have considered a linear interprocessor communication cost model in scheduling. The proposed technique is applied to several examples. They find that for these examples, the proposed macro pipelining based scheduling can improve the throughput rate several times that of the conventional homogeneous multiprocessor scheduling algorithms     

Minority carrier generation time and surface generation velocity determination from Q-t measurements

The time variation of the charge stored in an MOS capacitor during the transient period following the application of a step voltage is related to the minority-carrier generation mechanisms both in the bulk and in the surface. Therefore, the minority-carrier generation time and surface generation velocity can be determined by measuring the charge as a function of time. The method has been shown to be applicable to samples with both uniform and nonuniform doping concentrations. This technique does not require that the amplitude of the step voltage be kept small. Values of lifetime and surface generation velocity obtained by this technique are shown to agree well with those obtained by theC-ttechnique.