抑制漂移误差的多描述视频编码*

针对多描述编码的漂移问题,提出一种基于H.264的多描述编码方案。该方案先对原始图像空间域采样形成两个子图像,然后通过相关联的两路H.264编码器,生成包含相同运动信息的描述,并在解码端采用自适应三次线性插值法恢复补偿信息,达到抑制漂移误差的目的。实验结果表明,该方案能有效提高编码效率,同时获得较好的视频传输质量。     

聚苯乙烯-铂络合物催化硅氢加成反应机理的研究

将巯甲基化交联聚苯乙烯－铂络合物微球用于催化苯乙烯与甲基二氯硅烷的加成反应，考察了用硅氢加成试剂处理催化剂的时间对其催化行为的影响。发现催化活性中心主要是Pt（Ⅱ），催化剂的后处理时间明显影响硅氢加成反应的诱导期和活性，并根据实验结果提出了可能的催化机理。     

Single‐pack,self‐curable,aqueous‐based polyurethane dispersion containing a disperse dye

An organic‐solvent‐soluble disperse dye was introduced into an aqueous phase by a reaction with a self‐emulsified, aqueous‐based polyurethane (PU), and this resulted in the formation of a homogeneous, aqueous polymeric dye dispersion. This aqueous polymeric dye was stable in a water phase with excellent color extension upon application. It was formulated with a latent curing agent, polyaziridine (e.g., TMPTA‐AZ), as a single‐component, self‐curable, aqueous polymeric dye. The curing reaction took place between PU carboxylic acid and the latent curing agent upon drying. A self‐cured polymeric dye was obtained with excellent color extension and fastness and resistance to organic solvents and water after drying. This single‐component, self‐curable, aqueous‐based PU system containing a dye has potential for printing, writing, and dyeing applications. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 2006 © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3741–3747, 2006     

边防部队装备管理创新问题研究

边防部队装备管理创新,是适应部队编制体制调整、解决装备工作现实问题和提高部队战斗力的必然要求。对边防部队当前装备管理工作存在的主要问题进行了分析,从理顺装备管理体制、健全装备管理机制、完善管理手段、加强人才培养等4个方面提出了对策建议。     

Seniors and Information Technology in China

Technology, particularly information technology (IT), is changing rapidly and offers many advantages for users. IT has the potential to improve one’s quality of life, but only if used. Research has shown that, in most developed and developing nations, senior use of IT lags behind that of other segments of society. This “gray divide” is a concern for government, business, and others. Concern about senior adoption and use of IT has been the motivation for numerous studies and is the motivation for this study of Chinese seniors. This exploratory study examines urban Chinese seniors’ IT use, computers and mobile phones in particular, but also their attitudes and behaviors as they relate to the use of those devices. More specifically it examines several potential factors that motivate or hinder senior’s use of information technology, including self-efficacy, satisfaction, comfort with technology, and both positive and negative attitudes. This study provides some insight into the quantity and diversity of Chinese senior technology use in urban China. Particularly noteworthy, the study found that technology ownership was quite high, and in general the Chinese seniors studied had positive attitudes and beliefs concerning information technology. This is generally good news for the Chinese government, which must efficiently provide services for the growing population of Chinese seniors, as well as for businesses that wish to capitalize on one of the largest senior populations in the world.     

On the criteria for designing complex orthogonal space-time block codes

A complex orthogonal design (COD) used in space-time block codes is a kind of combinatorial design. It has been well studied because it has a fast maximum-likelihood decoding algorithm and achieves full diversity. When designing CODs, there are seven characteristics that should be considered, which include code rate, decoding delay, transceiver signal linearization, peak-to-average power ratio, etc. In this paper, we study the relationships among these design criteria. We prove that the maximum rate of generalized CODs (GCODs) that meet the last five criteria is 1/2. Moreover, we present a new method to construct GCODs based on CODs. Using this method on balanced complex orthogonal designs (BCODs), we obtain a novel class of GCODs that performs almost perfectly with respect to all the seven properties.     

采煤塌陷区地形渲染研究

随着煤炭的大量开采,塌陷区逐渐增多,严重地破坏了矿区生态结构,影响了矿区及周边地区人们的生活。因此良好的塌陷区漫游系统成为了治理这些危害的关键。三维地形是可视化系统及虚拟仿真的基本组成部分,也是此次项目至关重要的一部分。针对当前三维地形及其渲染技术的研究现状,该文结合常用图形接口OPENGL,在VC＋＋6.0平台下,运用GIS技术和采煤塌陷区地形数据,对LOD技术和ROAM算法进行研究,更好地实现塌陷区漫游效果。     

基于智能手机的实时体重健康管理系统软件设计

随着生活节奏的加快,办公室人群普遍缺乏运动是诱发健康问题的主要原因。目前国内对于办公室人群的健康问题尚未引起足够重视,市场上也鲜有相关产品问世。该文基于安卓平台在智能手机上开发出一款实时体重健康管理软件,结合位于鞋垫的传感器进行数据传输,根据足底压力判断人的当前运动状态从而实时指导用户锻炼,养生等行为。结果表明,将智能手机应用于健康管理的范畴具有很强的现实意义。     

Creating a live, public short message service corpus: the NUS SMS corpus

Short Message Service (SMS) messages are short messages sent from one person to another from their mobile phones. They represent a means of personal communication that is an important communicative artifact in our current digital era. As most existing studies have used private access to SMS corpora, comparative studies using the same raw SMS data have not been possible up to now. We describe our efforts to collect a public SMS corpus to address this problem. We use a battery of methodologies to collect the corpus, paying particular attention to privacy issues to address contributors’ concerns. Our live project collects new SMS message submissions, checks their quality, and adds valid messages. We release the resultant corpus as XML and as SQL dumps, along with monthly corpus statistics. We opportunistically collect as much metadata about the messages and their senders as possible, so as to enable different types of analyses. To date, we have collected more than 71,000 messages, focusing on English and Mandarin Chinese.