民族古籍文献藏、蒙、维语言信息显示的研究

民族古籍文献数字化保护中藏、蒙、维三种语言的处理问题是这个项目研究的主要难点之一,在i2ee oracle的开发平台上采用一种全新的方式--自定义标签和i2ee整体部署的方式来解决这个难题;不仅在技术上解决了它们的在系统的应用问题,而且这样也给编程人员在编程中带来很大的方便.使page开发人员,服务器应用程序开发人员彻底的分开;达到各自的工作独立性,减少交叉性,使三种语言的显示不再涉及后台服务器程序编写问题.     

适于UHF RFID标签芯片的高性能电源恢复电路

针对ISO 18000-6C标准,提出一种双电压输出稳压电路,有效降低了整体芯片功耗。基于Cadence Spectre设计仿真平台和TSMC 0.18μm CMOS混合信号工艺进行设计并流片。在-20℃～80℃温度范围内,工艺角从ff到ss变化,仿真得到整流电路的能量转换效率(PCE)为29.88%,稳压电路的温度系数为2.4×10-5/℃,电源噪声抑制比(PSRR)为91.4dB@10Hz和34.5dB@10MHz。同时对芯片进行测试,标签可以工作的最低输入射频功率为-9.5dBm,此时整流效率可达23.1%,稳压高低两路电压输出分别稳定在1.8±0.1V和1.0±0.05V,芯片面积约为0.166mm2。     

RFID系统性能及识别率优化方法研究

针对评估射频识别技术（Radio Frequency Identification, RFID）系统性能目标区域识别率的影响因素展开研究,从典型无源超高频RFID系统传播模型出发,讨论分析了影响识别率的主要因素,提出了多标签法和干扰抵消法两种识别率的优化方法。并就两种方法分别进行了实验测试,测试结果表明,采用两种方法目标区域识别率能分别提高11%和7.86%,能有效改善无源超高频 RFID系统性能。     

Hybrid textual-visual relevance learning for content-based image retrieval

Learning effective relevance measures plays a crucial role in improving the performance of content-based image retrieval (CBIR) systems. Despite extensive research efforts for decades, how to discover and incorporate semantic information of images still poses a formidable challenge to real-world CBIR systems. In this paper, we propose a novel hybrid textual-visual relevance learning method, which mines textual relevance from image tags and combines textual relevance and visual relevance for CBIR. To alleviate the sparsity and unreliability of tags, we first perform tag completion to fill the missing tags as well as correct noisy tags of images. Then, we capture users’ semantic cognition to images by representing each image as a probability distribution over the permutations of tags. Finally, instead of early fusion, a ranking aggregation strategy is adopted to sew up textual relevance and visual relevance seamlessly. Extensive experiments on two benchmark datasets well verified the promise of our approach.     

Gen2‐Based Tag Anti‐collision Algorithms Using Chebyshev's Inequality and Adjustable Frame Size

Arbitration of tag collision is a significant issue for fast tag identification in RFID systems. A good tag anti‐collision algorithm can reduce collisions and increase the efficiency of tag identification. EPCglobal Generation‐2 (Gen2) for passive RFID systems uses probabilistic slotted ALOHA with a Q algorithm, which is a kind of dynamic framed slotted ALOHA (DFSA), as the tag anti‐collision algorithm. In this paper, we analyze the performance of the Q algorithm used in Gen2, and analyze the methods for estimating the number of slots and tags for DFSA. To increase the efficiency of tag identification, we propose new tag anti‐collision algorithms, namely, Chebyshev's inequality, fixed adjustable framed Q, adaptive adjustable framed Q, and hybrid Q. The simulation results show that all the proposed algorithms outperform the conventional Q algorithm used in Gen2. Of all the proposed algorithms, AAFQ provides the best performance in terms of identification time and collision ratio and maximizes throughput and system efficiency. However, there is a tradeoff of complexity and performance between the CHI and AAFQ algorithms.     

射频识别标签用非对称缝隙天线设计

为寻找射频识别标签用缝隙天线新结构,提高标签芯片与缝隙天线的匹配性能,提出了射频识别标签用非对称缝隙天线.研究了非对称直缝隙天线和非对称弯折缝隙天线的阻抗随缝隙的长度和弯折角度的变化规律,在天线尺寸相同的情况下,将标签用非对称直缝隙天线与对称直缝隙天线进行比较,发现非对称直缝隙天线更易于与标签芯片匹配.尝试将非对称缝隙天线与Philips公司提供的标签测试芯片进行匹配,制作了相应的实物天线,仿真与测试结果说明所设计的天线满足RFID标签应用要求.     

Cache存储器的结构选择与实现

本文主要从结构、选择与实现等方面讨论Cache的设计问题.     

IP交换技术

互联网的快速发展、多媒体和实时业务的涌现对路由技术提出了产的要求,通过将第二层交换引到第三层路由当中可以很好地改善路由。在这方面比较突出的是ＩＰ Ｗｗｉｔｃｈｉｎｇ（ＩＰ交换）,Ｔａｇ Ｓｗｉｔｃｈｉｎｇ（标签交换）,ＡＲＩＳ,ＣＳＲ和ＭＰＬＳ。要译这几种技术分别做了论述,并着重讨论了ＩＰ Ｓ ｗｉｔｃｈｉｎｇ技术,将ＩＰ Ｓｗｉｔｃｈｉｎｇ技术与ＭＰＯＡ做了比较。