基于边缘权重分析的水面弱目标红外增强

为了提高水面环境下的弱目标红外图像的视觉质量,本文基于红外辐射理论,结合边缘分析与透射率等参数获取,实现了复原增强。通过辐射理论分析获得了原始场景图像关于透射率与路径辐射光的函数表达。利用暗通道先验,获取粗糙的透过率,结合边缘权重分析与导向滤波,获取精细透过率。在边缘分析基础上,确定了路径辐射。观测实验证明本文增强结果的潜在目标区域的局部对比好,突出了边缘与纹理特征。测试结果表明,本文方法运行速度快,增强的视觉效果好,客观评价值高,为后期的目标探测、识别等应用奠定了基础。     

CORS: A cooperative overlay routing service to enhance interactive multimedia communications

As interactive multimedia communications are developing rapidly on the Internet, they present stringent challenges on end-to-end (E2E) performance. On the other hand, however, the Internet’s architecture (IPv4) remains almost the same as it was originally designed for only data transmission purpose, and has experienced big hurdle to actualize QoS universally. This paper designs a cooperatively overlay routing service (CORS) aiming to overcome the performance limit inherent in the Internet’s IP-layer routing service. The key idea of CORS is to efficiently compose a number of eligible application-layer paths with suitable relays in the overlay network. Besides the direct IP path, CORS can transfer data simultaneously through one or more application-layer paths to adaptively satisfy the data’s application-specific requirements on E2E performance. Simulation results indicate the proposed schemes are scalable and effective. Practical experiments based on a prototype implemented on PlanetLab show that CORS is feasible to enhance the transmission reliability and the quality of multimedia communications.     

对于驾驶机器人性能综合评价的研究

为了综合评价驾驶机器人的驾驶性能,在单纯指标评价的基础上,提出一种新的综合评价方法.经过对驾驶机器人的实测验证,获得的数据证明此方法能时驾驶机嚣人驾驶性能进行定性的、直观的综合评价.     

先进封装电镀中活性边界层的减薄

晶圆表面如果有一层薄且均匀的流体边界层,将有助于克服光刻图形带来的挑战,得到更均匀的金属沉积层。     

网络图像检索重排序系统建模和仿真

基于关键词的网络图像检索得到的结果往往是海量且无序的,给用户造成不便。本文构建了一个网络图像检索结果重排序系统并进行了仿真。提出了一种利用图像SIFT局部特征构建图像间视觉Graph结构对图像进行聚类的重排序算法,并引入检索关键词的网络翻译以提高检索效率。仿真结果证明,系统的重排序结果满足网络用户的检索期望,验证了算法的有效性。     

Short Texts Classification Through Reference Document Expansion

With the rapid development of information technology, short texts arising from socialized human inter- action are gradually predominant in network information streams. Accelerating demands are requiring the industry to provide more effective classification of the brief texts. However, faced with short text documents, each of which contains only a few words, traditional document classifi- cation models run into difficulty. Aggressive documents expansion works remarkably well for many cases but suf- fers from the assumption of independent, identically dis- tributed observations. We formalize a view of classification using Bayesian decision theory, treat each short text as ob- servations from a probabilistic model, called a statistical language model, and encode classification preferences with a loss function defined by the language models and the ex- ternal reference document. According to Vapnik＇s meth- ods of Structural risk minimization （SRM）, the optimal classification action is the one that minimizes the struc- tural risk, which provides a result that allows one to trade off errors on the training sample against improved gener- alization performance. We conduct experiments by using several corpora of microblog-like data, and analyze the ex- perimental results. With respect to established baselines, results of these experiments show that applying our pro- posed document expansion method produces better chance to achieve the improved classification performance.     

CRSF攻击机制及防御策略研究

跨站点请求伪造（Cross—Site Request Forgery）是一种互联网上广泛存在的网络攻击,它通过第三方伪造用户请求来欺骗服务器端,达到冒充用户身份、行使用户权利的目的。文中通过分析跨站点请求伪造攻击的原理,并模拟其攻击过程、解析攻击产生的原因来向读者详细介绍此类攻击的特点,并从服务器端和客户端两个方向讨论了防御此类攻击的策略。     

High Purity and Large-scale Preparation of β-Ga2O3 Nanowires and Nanosheets by CVD and Their Raman and Photoluminescence Characteristics

Ga2O3 nano-structures, nanowires and nanosheets are produced on Au pre coated（111） silicon substrates with chemical vapor deposition（CVD） technique. By evaporating pure Ga powder in the H2O atmosphere under ambient pressure the large-scale preparation of β-Ga2O3 with monoclinic crystalline structure is achieved. The crystalline structures and morphologies of produced Ga2O3 nano-structures are characterized by means of scanning electron microscope（SEM）, X-ray diffraction（XRD）, selected area electron diffraction （SAED） and transmission electron microscope（TEM）. Raman spectrum reveals the typical vibration modes of Ga2O3 The vibration mode shifts corresponding to Ga2O3 nano-structures are not found. Two distinguish photoluminescence（PL） emissions are found at about 399 nm and 469 nm owing to the VO-VGa excitation and VO-VGaO excitation, respectively. The growth mechanisms of Ga2O3 nanowires and nanosheets are discussed with vapor liquid-solid（VLS） and vapor-solid（VS） mechanisms.     

DVB-C接收机中自适应均衡器的新设计

着重讨论一种全新的DFE与盲均衡相结合的自适应均衡器的设计,对于符合DVB—C标准的QAM信号,在输入存在多径、频偏及加性噪声的情况下,采用此设计无须借助于训练序列或导频即可成功对信道进行自适应均衡以抵消ISI,并能自动切换捕获和跟踪模式,仿真效果良好。此外还能在一定范围内对输入的符号功率进行调整以降低AGC模块的设计要求。     

我国三网融合背景下的技术专利分析

从2010年开始,我国开始推行三网融合.经过几年的试点工作,目前三网融合进入外推广阶段.从专利分析的角度,介绍了三网融合技术的专利申请的数量、技术趋势等方面的分布情况,通过介绍这一领域专利的现状和发展趋势,希望能对国内相关行业提供一定的参考.