基于权重的可视分存方案研究

视密码学的可视分存方案仅关注权重相同的参与者,忽略了原图主次信息的区别,造成了方案应用的局限性．为解决该问题,构建更具适用性、一般性的可视分存方案,提出了一种基于一般存取结构的可视分存方案,并进行扩展,进一步提出了基于权重的可视分存方案．该方案生成的图像与原图相比几乎没有任何失真,适用于黑白、灰度、彩色等各类图像的秘密共享．     

论言内语境对“吃＋宾（补）”结构的语义彰显作用

“吃＋宾”结构是现代汉语中讨论得比较多的问题,本文结合语境理论对其作了综合述评,着重探讨其言内语境;对学者们研究较少的“吃＋补”结构着重从语义指向角度分析其言内语境对语义的彰显作用。指出“吃＋宾（补）”结构生成发展的深层因素是汉民族的文化、心理、语言习惯。     

按行可交换随机变量三角阵列的收敛性

利用逆鞅的方法将行-列可交换随机变量的结果进行了推广,讨论了按行可交换随机交量三角阵列函数加权和的收敛性,得到了按行可交换随机变量三角阵列函数加权和的收敛性的一个结果.     

浅议高校本科生参与教师科研过程机制的探索

为适应社会发展对人才素质提出的要求,提高高校大学生的创新精神和研究能力,应加强教学与科研的有机结合,倡导学生,尤其是低年级学生参与教师的科研工作,鼓励把研究性教学贯穿于教学的全过程。     

用于监控的无线传感器网络系统开发环境探索

无线传感器网络是当前国内外传感器技术领域的特点研究课题。本文研究了无线传感器网络的软硬件平台。针对crossbow公司的产品,介绍了相应的软件平台TinyOS,讨论了此操作系统的开发语言nesC,提出了几种相应软件的安装方法。     

支持复杂语义的数据流滑动窗口连接建模和查询优化

数据流连接操作的执行方式直接影响到查询执行的效率和结果的正确性.在STREAM项目流化方法的基础上,对复杂应用下的数据流滑动窗口连接的准确语义进行了分析和建模,以时间窗口连接的增量维护为例提出了两种改进的基本维护策略,给出了针对元组窗和分组窗的维护方法,讨论了根据参数和环境的不同进行适应性的维护.实验证明了在不同的窗口、流速和选择度下,适应性地选择不同的优化算法会达到最优的处理性能.     

Strong quantum-confined Stark effect in germanium quantum-well structures on silicon

Silicon is the dominant semiconductor for electronics, but there is now a growing need to integrate such components with optoelectronics for telecommunications and computer interconnections. Silicon-based optical modulators have recently been successfully demonstrated; but because the light modulation mechanisms in silicon are relatively weak, long (for example, several millimetres) devices or sophisticated high-quality-factor resonators have been necessary. Thin quantum-well structures made from III-V semiconductors such as GaAs, InP and their alloys exhibit the much stronger quantum-confined Stark effect (QCSE) mechanism, which allows modulator structures with only micrometres of optical path length. Such III-V materials are unfortunately difficult to integrate with silicon electronic devices. Germanium is routinely integrated with silicon in electronics, but previous silicon-germanium structures have also not shown strong modulation effects. Here we report the discovery of the QCSE, at room temperature, in thin germanium quantum-well structures grown on silicon. The QCSE here has strengths comparable to that in III-V materials. Its clarity and strength are particularly surprising because germanium is an indirect gap semiconductor; such semiconductors often display much weaker optical effects than direct gap materials (such as the III-V materials typically used for optoelectronics). This discovery is very promising for small, high-speed, low-power optical output devices fully compatible with silicon electronics manufacture.     

Detection and analysis system for hybridization images of lab-in-a-tube microarray

A lab-in-a-tube microarray system is developed for sample inspection and signal detection by fabricating a fiat transparent window cap of the Eppendorf tube. The oligonucleotide microarray is immobilized on the inner surface of the cap. A small vessel is placed in an Eppendorf tube for storing hybridization solutions. With the microarray system, the full biochemical processes, including gene fragment amplification, fluorescence labeling, hybridization, and fluorescence detection, have been performed in the sealed tube without opening the cap. The images are obtained from a fluorescence microscope and captured by a CCD, and the data are transported to a computer through the universal serial bus （USB）. After noise reduction, signal intensity is determined from hybridization image and the presence of gene fragments is identified. The final data output includes sample information, process steps, and hybridization results. A lab-ina-tube microarray system for detecting ten respiratory viruses at a single detection is designed. High detection throughput and accuracy have been demonstrated with the system.     

Os isotopic composition of the earth’s primitive upper mantle

The osmium isotopic ratio of¹⁸⁷Os/¹⁸⁸Os ranging from 0.126 to 0.127 for the primitive upper mantle (PUM) is obtained according to the correlation between¹⁸⁷Os/¹⁸⁸Os and Al₂O₃ of mantle-derived xenoliths and orogenic peridotites, which consists with Allegre and Luck’s ALM value and similar to Yin’s nuggets uniform reservoir (NUR) value. It shows that the Os isotope ratio is lower than enstatite or ondinary chondrites, similar to carbonaceous chondrites (CV3).     

一种联机手写体的识别方法

利用联机书写的特点,提出了一种以方向码、笔划、笔顺等为提取特征,然后用统计学原理对手写体字符进行分类、识别的方法．通过对0～9九个数字编制各自独立的模块分别进行识别,经测试,识别率达99.8％以上,由于采用统计的方法,识别结果稳定．