摘要：A strain-introduced Mach-Zehnder interferometer (MZI) interleaver on lithium niobate (LiNbO3 ) is proposed. The structure of the strain-introduced waveguide is designed in detail, and is produced by depositing a SiO2 film on the annealed proton-exchanged LiNbO3 waveguide. Considering the sensitivities of the edge strain to the deposition temperature and the thickness of the SiO2 film, an optimum design of 50 GHz interleaver on this structure is given through analyzing the effective index changes for E x pq mode by finite difference method (FDM). The length of the bending waveguide in this interleaver is just two thirds of that in the conventional interleaver due to the high refractive index difference.

摘要：This paper presents an embedded SRAM design for write buffer applications in flash *** write buffer is implemented with a newly proposed self-adaptive timing control circuit,an area-saving sense-latch circuit and 6 T SRAM cell units.A 2 kb SRAM macro with the area of 135μm×180μm is implemented in and applied to a 128 Mb NOR flash memory with the SMIC 65 nm NOR flash memory *** simulation and chip test results show that the SRAM write buffer is beneficial to high-density flash memory design.

摘要：在高光谱异常检测的基于背景的估计的研究中,背景中存在的异常像元会对背景估计的准确性产生不利影响,通过获得一个不包含异常目标的纯净背景可以有助于提高异常目标检测算法的检测率。因此,本文提出一种基于局部密度的背景纯化方法以去除背景中的异常像元。经典的RX算法(Reed-Xiaoli detector,RXD)在背景统计信息估计时,因初始背景中存在异常像元而产生失真现象。这使RX算法的检测结果具有较高的虚警率。在本文中,将像元的局部密度作为该像元的异常度标签,通过最大类间方差法去除初始背景中潜在的异常像元,最后可以得到更纯净的背景集。利用纯化背景得到更准确的背景统计信息,可以有效降低RX算法的虚警率。首先,通过度量一定半径内的光谱邻域,获得像元的局部密度,半径选取为距离矩阵的平均中位数;然后,基于局部密度设计了两步分割策略:第一步,将原始背景分割为一个包含大部分背景像元的集合及一个混合着背景像元和异常像元的小子集。第二步,利用最大类间方差法处理小子集,获得一个判别阈值,去除局部密度小于该阈值的像元,得到纯净的背景。最后,利用RX检测算法和基于协同表示的检测算法验证所提背景纯化算法的有效性。本文算法对于圣地亚哥海军基地数据和Spec TIR数据,AUC值比LRXD分别提高了0.0246和0.0068,并且相比于其它算法有较高的检测率。实验结果说明,密度背景纯化方法有效抑制了异常点对背景数据的干扰,使背景协方差和均值等参数更准确,降低了虚警率。在计算密度时,需要人为设定半径值。对于两幅高光谱数据,在不同半径选择下DBRAD最大AUC差值为0.0088和0.0012,实验结果表明,人为选择半径值可能会对最后的检测效果造成较大影响。如何自适应选取半径将是下一步研究的重点。

摘要：Traditional honeypot is in fact a "passive proactive" defense mechanism because it may lose the value entirely once the adversary has detected the existence of the static trap and bypassed *** work focuses on a Self-Election dynamic honeypot framework which aims to bewilder attackers by coordinating and switching roles periodically to form a huge dynamic *** this paper,we discuss the UDP Spokesman synchronization scheme and the Self-Election coordination method,perform the framework simulation of the dynamic array honeypot with NS2,carry out the prototype implementation by Java,and then validate the effectiveness and feasibility on the simulation and prototype *** promising results of applying this framework to mitigate the effects of attacks are shown and *** work demonstrates that the Self-Election dynamic array honeypot system is feasible and effective for proactive network confrontation.

摘要：In this paper,we present the design of a new photonic crystal fiber(PCF)gas sensor for evanescent-field sensing in terahertz(THz)wave *** sensor can be used to identify the gas,and its size is very large,so that it is beneficial to fill it with the test *** on simulation,we demonstrate that the gas sensor using PCFs with four noncircular large holes in the cladding has high sensitivity and low loss,the confinement loss is less than 0.007 dB/m,and the bending loss is very *** new PCF gas sensor can detect kinds of gases,for example,if test gas is water vapor,it has obvious absorption peaks in THz band,and the sensitivities of gas sensor are 64%and 73%at 1.097 THz and 0.752 THz,*** to the ultra-low loss and high sensitivity of the model,the novel steering-wheel structured fiber is very suitable for evanescent-field sensing and the detection of chemical and biological products.

摘要：遗传因子的施主杂质在方形、塑造 V 、抛物线的量井说的浅水疗院用飞机波浪基础在有效团的信封功能理论的框架被学习。开始的四个杂质精力层次和扎根的状态的有约束力的精力比与变化方法更容易计算。当井宽度是小的时，计算结果显示杂质精力快速随井宽度和减少的增加铺平减少。状态增加直到它的地面的有约束力的精力到达最大的值，然后当井宽度增加，减少。结果是有意义的并且能广泛地在各种各样的 optoelectronic 设备的设计被使用。

摘要：Presented is a scheme of an embedded video remote monitoring system based on TMS320DM642. Using DM642 as the data processing core, the remote monitoring system is composed of video acquisition module, video processing module and communication module, which gives an implementation of class/mini driver module in DSP/BIOS integrated developing environment and also a common task module in application layer is achieved. The system realizes the entire functions of the analog video signal acquisition, H.264 video coding and Internet transmission. It provides the general connection for the future development and has good flexibility and extendibility. The system uses a modular design and overall development of programming methods to improve the efficiency of system development.

摘要：Fabric pattern contains many types of the available pattern elements, which not only can be used for the researchers, but also as the material for the designer. But existing method focus on the complete image retrieval, therefore lack methods of retrieving pattern elements. This article proposes a pattern elements retrieval algorithm based on cosine transform. Firstly, automatically segment the patterns according to size and location and filter the similar primary patterns, then, through cosine transform, analyze elements features in DCT domain, extract amplitude frequency and phase frequency. We employ 2-norm to measure the similarity, search 10 similar pattern elements in the sample library and save them in the design resources library. Experiment results indicate that this algorithm performs well while used in palace costume and carpet patterns, and got more than 75% of the average recall in 100 times experiments

摘要：Selecting Kizil grottoes as research target, this article discussed a new mode of integration of culture and science. Througha combination of website technologies HTML5 and PHP, ＂*** grottoes online exhibition＂ is realized. The main functions include contents show, database connection operation, information publication and layout design, it can satisfy application requirements of dynamic website.