Metal deposition on flexible membrane through the combination of localized electrochemical deposition and electroless plating

In this paper, we combined localized electrochemical deposition and electroless plating process for fabricating the metal pattern with the large area on flexible membrane. The pattern of the anode plate can rapidly transfer to the cathode membrane by localized electrochemical deposition. The thickness of the pattern can be increased by electroless plating process. The width of the mask pattern was close to the width of the final pattern. The anode plate can be used over fifty times for this process until the pattern was electrolyzed completely. This method provides a possible low cost approach to fabricate high metal structures on the flexible substrate with large area. It may have the potential to be applied in the fabrication of e-paper, flexible printed circuit and eventually adapted to roll-to-roll process.     

网络化动态轨道衡监测系统的设计与实现

介绍了网络化动态轨道衡监测系统的设计,分别阐述了系统的硬件设计和软件设计.硬件部分主要包括A/D转换电路,放大滤波电路,网络通讯接口电路和电源电路,为提高系统整体精度设计中采用了高精度的16位AD转换芯片AD7655,通讯方式采用以太网通讯;软件包括上位机和下位机两个模块,主要实现数据采集、以太网通讯、车体判别、数字滤...     

Ubiquitous interaction with positioning and navigation using a novel light sensor-based information transmission system

This paper describes a novel light sensor-based information transmission system for indoor positioning and navigation with particular benefits for mobile and wearable computers. It can seamlessly extend outdoor GPS tracking to the indoor environment. In a novel manner, fluorescent light is used as the medium to transmit information, which is encoded by using a pulse-frequency modulation technique. The user receives the encoded light information through a photo-receiver. The information is passed into the wearable or mobile computer after the data is decoded. This information allows positioning information to be given to indoor mobile and wearable computers. We design an economical transmitter circuit by adding few components to a commercial electronic ballast circuit for fluorescent lamps with price of less than US $10. The propose system can be used in indoor guidance and navigation applications. Exemplary applications are included in the paper, with experimented results detailed.     

High resolution scanning of absorbing and fluorescent electrophoresis gels using video image analysis

A low cost, microcomputer-controlled image analysis system is described which scans electrophoresis gels or photographic negatives with high resolution. Absorbing gels (e.g. with stained proteins) are analyzed using broadband or monochromatic visible light. The gel is scanned by a video camera with a macro objective; the gray level of each pixel is digitized sequentially and the values are stored in the computer memory. Repetitive scanning is used to average the absorption values before plotting on a digital plotter. Photographic negatives of gels and autoradiograms are scanned using the same technique. Fluorescent, non-absorbing gels (e.g. nucleic acids stained with ethidium bromide) are analyzed on a transilluminator with u.v. excitation radiation. The fluorescence intensity of each pixel is digitized and processed as described above.     

Design and simulation of quantum-dot cellular automata serial decimal pipelined processor based on Turing machine model

The quantum-dot cellular automata (QCA) nanoscale computer technology is promising to overcome the limits of the microelectronic CMOS technology. Because the leading role of QCA wires, the serial data transfer/processing is preferable. The financial, Internet of Things, and control computer applications require direct processing of decimal information without representation and conversion errors. Because a QCA wire can be considered as a virtual tape with written binary symbols, a special version of Turing machine model can be used for a QCA computer implementation. Design of a novel QCA serial decimal pipelined processor based on the Turing machine model is presented. The processor uses the run-time tape reconfiguration for arithmetic processing of decimal operands encoded in the 5-bit Johnson-Mobius code. The proposed design demonstrates significant hardware simplification.     

T型路口全感应交通控制器的设计

伴随着集成电路(IC)技术的发展,电子设计自动化(EDA)逐渐成为重要的设计手段,已经广泛应用于模拟与数字电路系统等许多领域。利用EDA工具可以在电子设计的各个阶段、各个层次进行计算机模拟仿真,保证设计工程的正确性,可以大大降低设计成本,缩短设计周期。交通灯控制系统可以实现交叉路口的红、绿灯自动控制,基于FPGA的交通控制系统具有电路简单、实时快速擦写、运算速度快、故障率低、可靠性高,而且体积小等特点。系统通过功能扩展、接口扩展可同时控制多个路口的红绿灯变换,可根据需要实现实时、快速擦写应用程序。设计采用了VHDL的结构描述风格,依据功能将系统分为控制模块、计数模块、显示模块、译码等模块,仿真结果表明控制系统自动实现了灯色的交替和转换,以及倒计时显示。     

Development of a user friendly gate-level logic simulator

A design of a digital logic simulator is developed and presented. BASIC on an IBM Personal Computer using interactive graphics tools is employed to make the simulator easy to use. The simulator can handle gate level logic circuits, and can be used for both logic verification and fault testing.

Efficient and correct simulation in a user-friendly environment was the main design objective. Concepts of interactive computer graphics are extensively applied to enable the drawing of the circuit. Menu structures have been used to simplify the interaction of user and computer. The foundation has been laid for a simulator that uses pattern recognition for circuit data acquisition.

The simulator permits the verification of the logic of a circuit without fault. The design also includes provision for inserting delays and simulating to detect hazards. Test sequences to detect the presence of faults in the circuit can be generated using deductive simulation. The design provides a reliable basis for further research into logic simulation.     

基于单片机的X-Y绘图仪控制系统设计

X-Y绘图仪是指能分别沿着X向和Y向移动的坐标尺,X-Y绘图仪接收计算机的命令,在图纸上绘出各种字符和图形。平面绘图仪的绘图系统、数控机床的加工系统等,尽管结构和功能各不相同,但基本原理相同。X-Y绘图仪系统是将机械系统与微电子控制系统相结合而形成的一个有机整体。本文通过对X-Y绘图仪的机械系统、控制系统及接口电路的硬件设计及软件设计等,阐述了用8051单片机控制步进电机的驱动,经传动机构带动X向和Y向的坐标尺进行平面绘图。该系统具有操作方便,速度快、精度高等特点。     

激光粒度测量中扇形SSPD的数据采集与处理

根据扇形自扫描光电二极管阵列 -SSPD的工作原理及信号特点 ,提出了一种计算机控制的数据采集与处理方法 ,包括串行微弱信号的放大、时序的配合、微机接口电路及非线性修正等内容 ,可以以较高的精度实时采集到SSPD各环的峰值。可应用于激光粒度的测量与其它空间光能量分布的探测中     

Designing effective transfer functions for volume rendering fromphotographic volumes

Photographic volumes present a unique, interesting challenge for volume rendering. In photographic volumes, the voxel color is pre-determined, making color selection through transfer functions unnecessary. However, photographic data does not contain a clear mapping from the multi-valued color values to a scalar density or opacity, making projection and compositing much more difficult than with traditional volumes. Moreover, because of the nonlinear nature of color spaces, there is no meaningful norm for the multi-valued voxels. Thus, the individual color channels of photographic data must be treated as incomparable data tuples rather than as vector values. Traditional differential geometric tools, such as intensity gradients, density and Laplacians, are distorted by the nonlinear non-orthonormal color spaces that are the domain of the voxel values. We have developed different techniques for managing these issues while directly rendering volumes from photographic data. We present and justify the normalization of color values by mapping RGB values to the CIE L*u*v* color space. We explore and compare different opacity transfer functions that map three-channel color values to opacity. We apply these many-to-one mappings to the original RGB values as well as to the voxels after conversion to L*u*v* space. Direct rendering using transfer functions allows us to explore photographic volumes without having to commit to an a-priori segmentation that might mask fine variations of interest. We empirically compare the combined effects of each of the two color spaces with our opacity transfer functions using source data from the Visible Human project     

基于图像的树木测量方法

树木是城市绿化、美化的一个重要的组成部分,具有重要的科学、历史和观赏价值。传统的树木生长信息采集方式,利用人工使用卷尺或不易操作、低效率和复杂麻烦的大型测量仪器等,费时、费力、准确度又不高。结合计算机视觉、数学几何模型等技术,设计了一种新式的树木高度、胸径和冠幅测量模型,提出了基于图像的树木测量方法和实现了树木信息采集软件系统;为了得到更精确的测量结果,使用摄像头标定技术和坐标校正方法对图像进行畸变矫正;并且利用正交试验分析法分析本设计使用的最佳拍摄环境,最终相对误差控制在4%左右。本方法具有携带方便、操作简单、适用面广、准确度高的优势。     

Home automation - an IoT based system to open security gates using number plate recognition and artificial neural networks

This paper proposed a system that automatically opens security gates. A system is designed and implemented to automatically open security gates for vehicles using Licence Plate Recognition. Image processing is used to extract the licence plate and characters, and an Artificial Neural Network is used to perform Optical Character Recognition on licence plate characters. Internet of Things principles are introduced to the system to allow for web and mobile application integration. A proximity sensor is designed to detect vehicles and to start the recognition process. An ambient light sensor and control circuit is developed to control ambient lighting conditions using an ambient light source. The neural network achieved an accuracy of 88% on training data and 93% on licence plate characters. A unique strong point of the system is the ability to monitor and control the system using a web interface or mobile application. The system is also able to produce mobile notifications regarding security gate access attempts.     

工业电流变送器的设计与制作

在工业控制过程中,普遍需要测量各种非电物理量,并将其转换为电信号传输到几百米外的控制室或显示设备上。但是专用变送器不能满足工业化的高精度变送要求,对此,设计了一个由传感器、调理电路和两线制电压/电流变换电路构成的两线制高精度变送器。为了方便检验和测试变送器,传感器选用的是电阻传感器。采用两线制传输,这不仅节省大量的传输线,并且省去了大量的传输电流。通过系统测试,设计的变换精度优于0.5%,变换非线性度优于1%。     

Development of reel-to-reel microchip mounting system for fabrication of meter-long LED lighting tapes

We have developed a reel-to-reel microchip mounting system that continuously mounts LED chips and other microchips on meter-long flexible printed circuit board (PCB) tape for 1.2-m-long standard LED light tubes. Mounting microchips on meter-long PCBs is difficult because a large chip mounter is expensive and the chip positioning stage is difficult to move in a meter-wide area with an accuracy of hundreds of micrometers. Hence, we developed a new microchip mounting system that utilizes a small chip mounter and reel winding machines. The system repeatedly moves the long PCB tape by a certain length with the reel winding machines and mounts the chips on it. The PCB tape (which is 5 mm wide) is made by fabricating long PCB tapes which are 25 cm × 26.6 m through a roll-to-roll PCB process and slitting them into meter-long tapes. The reel-to-reel system repeatedly mounts chips by adjusting their positions through image processing of the copper wiring pattern on the PCBs. Our constructed system mounted 24 LED chips with a pitch of 5 cm with an accuracy of 0.082 mm to form a 1.2-m-long LED tape. The luminance of the tape is 12.4 lx at a distance of 1 m, which is the luminance of outdoor corridor lighting. Therefore, this system can be used for meter-long tape lighting.     

基于TMS320VC33的多处理机图像处理系统

介绍了一种基于TMS320VC33的高速多处理机图像处理系统的设计技术，该系统可以广泛地应用于实时图像信号的检测和处理。本系统设计灵活，不改变硬件电路的设计，通过软件编程就可以适用于各种不同分辨率的图像采集。DSP和计算机之间采用PCI接口，满足大量图像数据传输的 需要，有广泛的应用前景。     

基于FPGA的便携式VI曲线航空电路板测试装置

目前对便携式VI曲线航空设备电路板测试装置的研究较少,不能满足外场环境下的应急测试需求;针对这一问题,提出了一种放置于手提式机箱中的便携式VI曲线电路板测试装置的设计方案,以FPGA为主控器件设计测试板件,以给定程序可调的激励信号、采集在各种激励信号下的电流信号、并把电压电流数据通过USB接口传送给上位机,上位机采用迷你工控机进行设计,在接收到电压电流数据后,进行数据处理并在显示屏上实时绘制相应的以电压电流为横纵坐标的图像信息;试验结果表明,针对不同类型的阻抗元件,装置可以绘制出相应类型的VI曲线,从而识别出元器件的不同状态;装置小巧轻便,操作简单,可以运用于外场机载电路板件的测试诊断。     

Dynamic tape path alternation with novel rotary guider

To enable higher recording density and data access accuracy, controlling lateral tape motion within high precision specifications through calibrated tape tension control is one of many key focuses for extra high density magnetic tape drives. This paper presents a novel rotary actuation mechatronic system which regulates travelling tape tension in a modern tape drive by dynamically alternating its tape path through closed-loop controls. Effectiveness of the system was demonstrated through calibrated laboratory parametric studies from which variation of travelling tape tension was found to be significantly reduced. The work described herein suggests engineering feasibility of using flangeless guiders in modern advanced tape drives as well as tape tension control without regulating tape drive??s driving motors.     

基于nRF401的单片机无线抄表系统

为了提高单相电度表的抄录、校准等工作的效率和准确性，开发了一种基于nRF401无线通信模块。此模块用来实现上位单片机和多个单片机间的无线串行通信，并利用该方法设计了一种新型无线抄表系统，给出了硬件线路同、通信协议、程序流程图及用MCS51汇编语言编写的部分串行通信程序。该抄表系统硬件电路简单、成本低廉、编程方便，能在多台单片机间安会传递数据。