基于CPLD的数字音频系统设计

多通道音频控制器是数字音响系统必不可少的组成部分 ,它可以通过程序对输入功放的的多路音频信号进行选择 ,对音量和音调进行调节 ,并以数字方式直观显示控制结果。另外还具有话筒输入信号放大以及放大后与原音混合实现伴唱的功能。为简化所设计的数字电路 ,本系统使用大规模可编程逻辑控制器CPLD作为系统核心 ,将程序编译后下载到CPLD器件中 ,实现设计所要求的功能     

An experiment on digital library based on the method of TQM system

INTRODUCTION Total quality management (TQM), as a manag- ing concept and method, achieved much in every aspect of life, has been praised highly by various managers and supervisors, and has been commonly applied in libraries in the world. But, as a newly mushrooming digital library, there are still different opinions and ideas on its operation model and man- aging method (Li, 2005). Based upon thorough re- search on the TQM system, the problem of applying TQM in digital library is discu…     

EDA技术及其应用

随着大规模集成电路技术和计算机技术的不断发展,电子技术得到了飞速发展,电子设计自动化（EDA）技术,加速了现代高科技发展的进程_从微电子技术、微电脑技术到信息技术等领域,EDA技术的含量正以惊人的速度上升,在电子系统设计上产生了具有里程碑意义的飞跃,为大规模可编程逻辑器件的应用奠定了基础．     

基于层次分析法的堤防工程设计方案优选

为了更好地评价堤防工程设计方案的优劣,应用层次分析法建立了设计方案优选指标体系及结构模型,从多因素、定量与定性相结合的角度来确定最优方案.实例计算表明,层次分析法为设计者选择技术上可行、经济上合理的设计方案提供了一种有效的方法.     

Environment map building and localization for robot navigation based on image sequences

SLAM is one of the most important components in robot navigation. A SLAM algorithm based on image sequences captured by a single digital camera is proposed in this paper. By this algorithm, SIFT feature points are selected and matched between image pairs sequentially. After three images have been captured, the environment＇s 3D map and the camera＇s positions are initialized based on matched feature points and intrinsic parameters of the camera. A robust method is applied to estimate the position and orientation of the camera in the forthcoming images. Finally, a robust adaptive bundle adjustment algorithm is adopted to optimize the environment＇s 3D map and the camera＇s positions simultaneously. Results of quantitative and qualitative experiments show that our algorithm can reconstruct the environment and localize the camera accurately and efficiently.     

Digital design of scaffold for mandibular defect repair based on tissue engineering

Mandibular defect occurs more frequently in recent years, and clinical repair operations via bone transplantation are difficult to be further improved due to some intrinsic flaws. Tissue engineering, which is a hot research field of biomedical engineering, provides a new direction for mandibular defect repair. As the basis and key part of tissue engineering, scaffolds have been widely and deeply studied in regards to the basic theory, as well as the principle of biomaterial, structure, design, and fabrication method. However, little research is targeted at tissue regeneration for clinic repair operations. Since mandibular bone has a special structure, rather than uniform and regular structure in existing studies, a methodology based on tissue engineering is proposed for mandibular defect repair in this paper. Key steps regarding scaffold digital design, such as external shape design and internal microstructure design directly based on triangular meshes are discussed in detail. By analyzing the theoretical model and the measured data from the test parts fabricated by rapid prototyping, the feasibility and effectiveness of the proposed methodology are properly verified. More works about mechanical and biological improvements need to be done to promote its clinical application in future.     

基于Multisim《数字电子技术》课程教学设计

《数字电子技术》课程是计算机、电气等专业开设的一门重要基础课程,将Multisim电路仿真设计贯穿本课程整个教学设计中优化课堂教学的同时激发了学生的创新思维。本课程的教学设计主要从教学目标设计、教学方法设计、教学过程设计、教学评价设计几个方面来阐述并以"555定时器实现彩灯循环控制电路"内容教学设计为例进行具体阐述。     

基于DSP的数字信号处理实验设计

针对数字信号处理及DSP技术教学中的困难,设计1个FIR数字滤波的综合实验.采用窗函数法,借助Matlab程序设计语言,设计FIR数字滤波器,应用DSP汇编语言编程实现该滤波器.实践表明,该实验设计使学生能更好地理解和掌握该课程的基本理论,并能提高学生的工程应用能力,提高本课程的授课效果,提高学生分析问题、解决问题和动手能力,使学生通过本课程的学习更加适应工作的需要.     

基于Rockwell PLC-5温度控制系统实验设计与实现

基于Rockwell PLC-5设计温度控制系统。为了便于实现比例-微分-积分控制器参数整定,对被控对象——电热箱进行实验建模;为了降低输入输出误差,对温度采集及变送环节进行实验建模;基于被建模型,采用改进欧拉法完成被控对象的数值仿真,提供数值仿真对象,可以方便进行控制参数整定,快速看到控制效果;采用模糊比例-微分-积分控制器,实现温度控制;基于Rsview完成人机交互界面和数据动态显示;完成了Rockwell PLC-5温度控制系统仿真平台和实际系统的开发,实现了温度控制系统演示实验和温度控制系统半开放实验设计,达到了预期的实验设计目标。     

基于DMA方式的气象卫星资料进机/转发卡的设计

采用FIFO缓冲技术和先进的可编程逻辑电路MACH系列产品。通过微机DMA技术写内存方式．实现对连续的、高速的、大量的串行数据的实时采集、存储与转发。     

基于 FPGA设计及应用课程的理论和实践教学方法探索

FPGA设计及应用是电子专业集软件和硬件于一体的专业课。目前FPGA设计课程设置缺乏系统性,安排不合理,学时分配不均衡,仿真软件单一、综合性训练少等问题,教学改革就显得迫切需要。本文就FPGA课程提出了一种基理论教学、基础实验、综合实验,手机APP于一体的教学模式,再加上开放性课程设计对综合能力的培养。通过将理论和实践相互融合、相互促进,激发学生的学习兴趣、提高学生的创新能力和独立解决问题的能力。     

无线传感器网络跨层通信协议综述与分析

设计基于跨层机制的通信协议,以达到优化网络性能、有效分配网络资源的目的,是无线传感器网络研究中的一项关键技术.对现有的基于跨层设计的网络通信协议进行综述和分析,并以跨层通信协议设计的目的性为着眼点,对跨层通信协议划分为3类：提高互操作性和增强网络适应性为目的的跨层设计,提高某些性能标准为目的的跨层设计和无分层模型设计.该分类方式有助于网络设计人员进行更具有针对性和实用性跨层设计.     

聚丙烯酰胺活化过氧化氢氧化邻苯三酚红催化褪色光度法测定痕量钴

在pH=8.3硼酸-硼砂缓冲溶液中,聚丙烯酰胺(PAM)活化钴(II)催化过氧化氢氧化邻苯三酚红(PGR)使之褪色的指示反应,确定了催化褪色反应测定钴(II)的动力学条件,建立了测定痕量钴的高灵敏度的褪色光度法。此法线性测定范围为0.012～0.28μg/L,检出限为6.0×10-12g/mL,线性回归方程为△A=0.1045+1.199Cco2+(μg/L),r=0.9994。当加入PAM时,△A比不加PAM增大6.5倍。常见离子不影响测定。     

Performance of LIDAR- and radar-based turbulence intensity measurement in comparison with anemometer-based turbulence intensity estimation based on aircraft data for a typical case of terrain-induced turbulence in association with a typhoon

The Hong Kong Observatory (HKO) provides low-level turbulence alerting service for the Hong Kong International Airport (HKIA) through the windshear and turbulence warning system (WTWS). In the WTWS, turbulence intensities along the flight paths of the airport are estimated based upon correlation equations established between the surface anemometer data and the turbulence data from research aircraft before the opening of the airport. The research aircraft data are not available on day-to-day basis. The remote sensing meteorological instruments, such as the Doppler light detection and ranging (LIDAR) and radar, may be used to provide direct measurements of turbulence intensities over the runway corridors. The performances of LIDAR- and radar-based turbulence intensity data are studied in this paper based on actual turbulence intensity measurements made on 423 commercial jets for a typical case of terrain-induced turbulence in association with a typhoon. It turns out that, with the tuning of the relative operating characteristic (ROC) curve between hit rate and false alarm rate, the LIDAR-based turbulence intensity measurement performs better than the anemometer-based estimation of WTWS for turbulence intensity at moderate level or above. On the other hand, the radar-based measurement does not perform as well when compared with WTWS. By combining LIDAR- and radar-based measurements, the performance is slightly better than WTWS, mainly as a result of contribution from LIDAR-based measurement. As a result, the LIDAR-based turbulence intensity measurement could be used to replace anemometer-based estimate for non-rainy weather conditions. Further enhancements of radar-based turbulence intensity measurement in rain would be necessary.