DVD视盘机的电磁骚扰抑制

本文讨论对DVD视盘机的电磁骚扰的抑制，使其电磁骚扰水平符合有关标准的要求，不成为新的电磁环境中的污染源。     

以HDD代替江底隧道铺设管缆的建议

刘广志院士看到“Trenchless Technology”July.2002的一篇关于中油华东公司在南京三江口钻成一口大口径跨越长江的钻孔的报道后，向四川和915工程公司提出“以钻代坑”穿越大江大河，以加快西部大开发的步伐，提升我国自主研发重型非开发设备的建议。     

Automatic playlist generation based on tracking user’s listening habits

Algorithms for automatic playlist generation solve the problem of tedious and time consuming manual selection of musical playlists. These algorithms generate playlists according to the user’s music preferences of the moment. The user describes his preferences either by manually inputting a couple of example songs, or by defining constraints for the choice of music. The approaches to automatic playlist generation up to now were based on examining the metadata attached to the music pieces. Some of them took also the listening history into account. But anyway, a heavy accent has been put on the metadata, while the listening history, if it was used at all, had a minor role. Missings and errors in metadata frequently appear, especially when the music is acquired from the Internet. When the metadata is missing or wrong, the approaches proposed so far cannot work. Besides, entering constraints for the playlist generation can be a difficult activity. In our approach we ignored the metadata and focused on examining the listening habits. We developed two simple algorithms that track the listening habits and form a listener model—a profile of listening habits. The listener model is then used for automatic playlist generation. We developed a simple media player which tracks the listening habits and generates playlists according to the listener model. We tried the solution with a group of users. The experiment was not a successful one, but it threw some new light on the relationship between the listening habits and playlist generation.     

Design of noise and period-time robust high-order repetitive control, with application to optical storage

Repetitive control is useful if periodic disturbances or setpoints act on a control system. Perfect (asymptotic) disturbance rejection is achieved if the period time is exactly known. The improved disturbance rejection at the periodic frequency and its harmonics is achieved at the expense of a degraded system sensitivity at intermediate frequencies. A convex optimization problem is defined for the design of high-order repetitive controllers, where a trade-off can be made between robustness for changes in the period time and for reduction of the error spectrum in-between the harmonic frequencies. The high-order repetitive control algorithms are successfully applied in experiments with the tracking control of a CD-player system.     

基于遗传模糊推理的RPG玩家体验综合评估方法

为更高效自动地评估游戏中玩家的主观体验,强调主观满意度在游戏评估中的作用,提出一个基于玩家主观评价方法构造角色扮演类游戏(RPG)的评估模型.通过因子分析处理问卷收集的玩家评分,降维后得到7个游戏评估因子并进行解释.使用适合于描述人类思维特点的模糊推理机制来模拟玩家的评价过程,配合遗传算法来调整模糊推理过程中的参数,有效提高了评估模型的准确性.     

基于环保的广告机概念设计

广告机这一产品通过视频、音频的形式向公众传达信息,其主要使用环境为公共场合。在广告机概念设计上。不仅注重外观的时尚和简洁,有时为了向人们传达环保的理念,特别在广告机面板下方的广告单领取口镂空丝印一个树和海洋图标。当人们领取广告单时,广告单数量减少．图标会逐渐的产生变化。通过这种图标的变化来警示人们环保的重要性。     

基于有向图的足球视频中球员分类算法

基于传统的直方图球员分类方法由于缺乏描述图像颜色的空间信息而造成分类误差,而且该方法需要先验的模板信息。为此,本文提出一种基于有向图的足球球员的分类方法。首先,利用HSV模型中主颜色方法提取候选球员,并利用等面积矩形划分策略对图像进行分块;其次,对子块的HSV颜色空间进行量化,并将统计直方图作为颜色特征,然后通过颜色特征计算图像之间的距离,并利用距离矩阵生成对应有向图;最后,通过对有向图的顶点分类实现球员的分类。实验结果表明,本文提出的方法能够在没有先验模板信息的条件下,能够有效地解决处在分类边界上的球员分类问题,获得98.23%的分类正确率,与传统方法相比,具有更好的分类效果。     

Android 平台的 VLC 播放器实现机制研究

分析了 Android 平台上的 VLC 播放器实现机制,重点介绍了播放器的界面设计思路,以及 SQLlite3数据库存储及管理多媒体文件信息的实现机制。通过介绍源码编译方法生成依赖库和分析多媒体文件播放相关的核心模块,为下一步实现 VLC 跨平台移植和开发视频资源在线学习移动平台提供借鉴。     

基于SOPC的mp3播放器设计

本论文主要从音频播放和SOPC技术的交叉点出发,提出了运用SOPC技术在Altera的CyelonⅡ EP2C35FPGA上构建mp3播放器的设计方案。本设计运用IP复用、软硬件协同、硬件加速等方法,结合实验平台资源特点,构建了基于NiosⅡ软核处理器的mp3播放系统。实现了MPEGⅠ layerⅢ音频解码的流畅播放。该系统具有体积小,设计灵活,开发周期短等优点。     

FLV文件解析及其在网站中的应用

Flash Video作为一种最流行的视频格式,具有压缩率高、解码快、图像质量好的特点。本文研究FLV文件结构及各个字段的具体含义,并在此基础上详细介绍两种开源播放器在网站上的使用方法。