基于FPGA的ASI信号接收与发送的实现

提出了一种用FPGA芯片代替Cypress公司的CY78933和CY78923芯片来实现ASI信号接收与发送的方案，详细阐述了DVB—ASI接口的硬件组成与FPGA实现，该接口符合DVB—ASI的接口规范，可实现270Mbps的信号传输，已经得到实际运用。     

基于ASI的高速数据传输接口的设计

介绍了一种基于ASI编码的高速数据传输接口设计方案。该传输接口利用NS公司的CLC007和CLC014芯片进行发送驱动和接受均衡,利用CYPRESS公司的CY78923和CY78933芯片进行编码和解码,采用ALTERA的FPGA实现数据缓冲与转换的功能,并通过对数据的分组打包和解包校验的方法,保证数据的完整性及正确性。编码产生的数据利用50n阻抗匹配的同轴电缆进行传输,传输速率最高可达400Mbps,传输距离最远可达200m。     

DVB-IP网关中ASI环出电路的实现

为了在DVB-IP网关中实现性能优良的ASI环出电路,提出了一种DVB-IP网关中ASI环出电路的实现方法。该方法以PE-65508差分转换芯片、CLC014高速自适应均衡器芯片与CLC006高速电缆驱动芯片为基础,不仅结构简单,还实现了270Mbps ASI码流的环出。先介绍了ASI与SPI的特点,接着详细阐述了ASI环出功能的具体电路工作原理,最后给出了测试结果。该ASI环出电路具有约1.8倍的放大性能,不但环出能力强,而且完全适用于环出后的再传输与多级环出的应用。     

航空静止变流器低频脉动电流的抑制

研究航空变流器优化设计问题,由于两级式航空静止变流器的前级DC-DC变换器输入电流中含有两倍变流器输出频率交流分量,引进较大的低频脉动电流,不仅影响变换器的稳定性,而且减小蓄电池的容量,缩短蓄电池的使月寿命。为解决上述问题,提出相应的控制策略,即在平均电流控制中引入带阻滤波器将电感电流参考信号中的低频脉动信号滤除,进而有效抑制变换器输入电流中的低频脉动分量。建立了带阻滤波器的传递函数,并提出了设计准则。最后通过仿真验证控制策略对于抑制航空静止变流器输入低频脉动电流的有效性,优化变流器性能。     

机场行李系统输送线PLC硬件和程序设计

在北京首都国际机场三号航站楼行李处理系统中,承担主要行李传送任务的皮带输送线,使用PLC和分布式I/O、DP从站,应用Profibus和ASI两种总线结构,并通过软件编程,对现场输送机进行控制,在保证行李高效传输要求的同时,实现了输送机运行控制、行李间隙控制、行李自动跟踪等要求。同时,通过将安检设备、ATR行李条码扫描设备集成在PLC的Profibus网络中,实现机场托运行李的后端安检、自动分拣等功能要求。经过实际测试和运行,证明网络系统构成灵活、数据读写传输实时性好、可靠性强,便于系统升级和扩展。     

The Addiction Severity Index as a predictor of the use of mental health care.

The Addiction Severity Index (ASI) has been extensively used in the United States and Europe as an indicator of the problems of substance abuse patients. Several studies have shown the ASI to be a reliable and valid instrument, but lately doubt has arisen regarding its validity and reliability. The article focuses on a specific scale of the ASI-the Psychiatric Status scale-and its strength in predicting the use of mental health care. A group of 1,027 heroin patients in Rotterdam, the Netherlands, who participated in a methadone program were the subjects. Three indices have been used: the evaluation index, the clinical index, and the composite scores. It appears that no matter which indices are used, the Psychiatric scale does discriminate between those who will have contact with mental health care and those who will not. However, the percentage of false positives is high. None of the indices predicts the intensity and duration of the mental health care treatment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adaptive sparse system identification using normalized least mean fourth algorithm

Normalized least mean square (NLMS) was considered as one of the classical adaptive system identification algorithms. Because most of systems are often modeled as sparse, sparse NLMS algorithm was also applied to improve identification performance by taking the advantage of system sparsity. However, identification performances of NLMS type algorithms cannot achieve high‐identification performance, especially in low signal‐to‐noise ratio regime. It was well known that least mean fourth (LMF) can achieve high‐identification performance by utilizing fourth‐order identification error updating rather than second‐order. However, the main drawback of LMF is its instability and it cannot be applied to adaptive sparse system identifications. In this paper, we propose a stable sparse normalized LMF algorithm to exploit the sparse structure information to improve identification performance. Its stability is shown to be equivalent to sparse NLMS type algorithm. Simulation results show that the proposed normalized LMF algorithm can achieve better identification performance than sparse NLMS one. Copyright © 2013 John Wiley & Sons, Ltd.     

应用CPLD实现ASI-SPI接口转换的方法

遵照国家的DVB标准及SPI接口标准,提出一种不需要使用FIFO,就能恢复出SPI接口的PSYNC、DAVLID信号的方案.经硬件实现,仅使用CPLD芯片就能完成该功能,实时稳定地产生出PSYNC、DAVLID信号,避免了使用FPGA芯片及FIFO带来的高成本问题.对SPI时钟的恢复提出一种新的解决方法,简化了ASI-SPI转换卡的硬件设计.     

ASI法测定土壤有机质与国标法的相关性研究

对ASI法与GB9834—88测定土壤有机质的结果进行了相关性比较。结果表明,全部样本的ASI法与GB9834-88分析方法的有机质之间存在极显著正相关,相关方程为Y=0．9348x＋0．018（R^2=0．9737＊＊）,两种方法最大相对偏差仅为1.4％。由于ASI方法具有简便、快速和准确的特点,同时减少了铬的污染,是一种较好的土壤有机质测定方法,     

基于并播技术的DVB发送卡设计

介绍了并行广播技术,提出了作为大规模信源的并行数据如何通过MPEG-2传输流数据发送卡实现这种海量传输的硬件实现方案,并分析了设计要点.