Web安全测试及对策研究

随着WEB应用程序在更广泛范围的使用及WEB工程概念的提出,Web安全的测试就成为一项重要的工作.而Internct和Web媒体的不可预见性使得测试变得困难,必须为测试复杂的基于Web的系统研究新的方法和技术.文章在分析WEB系统的布署环境,应用程序,数据库和系统容错等方面存在安全漏洞的基础上,对Web安全测试的要点和方法进行了探讨,并对测试中可能发现的问题给出了解决方法.     

DM500S卫星多媒体接收机的GPRS网络共享

Dreambox的GPRS网络共享技术最先是俄罗斯烧友开发的,去年的11月份在国内某卫视论坛开始讨论起来,我国台湾的www543网友率先推出了内含PPP dial拨号功能的Gemini 4.10繁体版,并推出了视频教程,介绍如何通过支持GPRS串口功能的手机连接DM500S的软件设置方法,推动了这股GPRS网络共享的高潮。一些敏锐的小厂嗅到这一技术优势,迅速地推出了基于DM500S的内置GPRS模块。     

三景札记——惦感动当时

午夜十二点,拖着疲惫的身体匆忙赶往回家的路。黑夜的沉寂和寒冷犹如一尊巨大的怪兽横亘在我面前,这呼啸的风,甚至吹灭了我回家的最后一盏路灯。抱紧冰冷的躯体,任一午夜十二点的灯光     

UMPC/MID处理器战火起

低功耗、低成本与机体轻薄小型化的趋势在市场上逐渐成为一个趋势,过去来说,比较强调低功耗、轻薄、轻巧与电池长效使用的产品往往都是属于较高端且昂贵的产品,但是随着2007年底至今前述的情况开始有所转变,小型的台式电脑与小型的笔记本电脑市场开始有所增长,这一类的增长不见得是要取代旧有的电脑,这一类型的电脑例如小型的笔记本电脑,比较像是成为消费者的第二或第三台电脑,特别是针对时常需要旅行携带的消费者,例如ASUS的eeePC、HP的mini-note等成为正夯的UMPC代表性产品.     

市场需求引爆"办公添彩革命"

彩色激光打印的异军突起正在为数字信息时代的办公带来一场彻底的变革.激烈的市场竞争使企业对信息化越来越重视,如何提高工作效率、增强自身的竞争力,尤其增强与客户之间的有效沟通,成为无数企业面临的问题,而在单调的黑白文件中添加能吸引眼球的色彩,无疑是一个很好的选择,一场"告别黑白,办公添彩"的革命正在兴起.     

当今世界的繁荣从何而来

《则富的诞生》一书的作者威廉·伯恩斯坦是一位神经病学家,但此书并不是关于神经系统紊乱的著作,而是一部既轻松又严肃的财富增长史. 最初,经济学只是伯恩斯坦的一个业余爱好.他的兴趣在储蓄、投资和资源配置的整个过程方面,也许他的最终目标是把他挣的钱投入到医学研究中.     

一种低功耗液晶显示的便携式射频识别读写器系统

提供了一种用于便携式射频识别读写器的低功耗液晶实时显示系统,工作频率在 125 kHz 国际通用频段.基于降低功耗的考虑,采用当前先进的超低功耗的片上系统(SOC-System On Chip),将外围电路尽可能地放置于 SOC 芯片内,运用了集成在控制器内部的液晶驱动电路.运用软件实现了解码、数据校验、识别、实时处理和数据显示等功能.从而简化了传统的微控制器控制的 RFID 读写器所需的庞大液晶驱动硬件电路和其引入的额外误差,具有重要的实用价值,并且功耗和成本很低.     

印象重庆

崇尚自由的我喜爱东走西逛,总是忙里偷闲地利用假期行走于各个城市。每个城市部拥有自己的历史、自己的文化、自己的名片,而山城重庆的名片,解放碑、美女、老茶馆、江景、火锅……都深深吸引着我。仅是表观决定性瞬间的照片显然不足以表达一个城市的全部,我更希望将城市的色彩、声音一并囊括,最终我选择了索尼DSC-T500数码相机。它不仅能拍摄清晰的照片,还能以高清视频的方式同步录制所见所闻,为我的旅行留下更多更立体的回忆。     

精益科技OpticSlim M12携带式扫描仪有型有款行动商务新利器

M12拥有简约利落外型与高度机动性,为热爱时尚的商务人士绝不可错过的梦幻逸品 对于经常需要在外奔波的商务人士而言,随身的公文包内除了沈甸甸的NB之外,不外乎就是参加展览时所收集的厂商产品型录或是与客户会面时所需的数据.     

影院新片巡礼

在不久的将来,科技的发展使得城市更加繁荣。在城市繁华的背后世界上却出现了越来越多的黑暗角落,那里邪恶丛生且无人问津,成为了恐怖滋长的地带。退伍老兵图洛普生活窘迫,可一次护送工作将彻底改变他的命运,一个为了弥赛亚降生而出现的神秘女人成为了图洛普押送的对象,可这正是改变人类命运的关键点。     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

避免MOS管在测试时受EOS损坏的方法

由于MOS管是浅结系列产品,极有可能在测试时遭到静电击穿或过压过流而损坏。文中主要介绍MOS管在测试过程中,会造成实际测试时器件加上了允许的最大电压、电流或功率而导致器件损坏的情况。例如,在测试过程中电源连接不良,测试片与器件接触不良,管脚接错,在测试程序中未设置正确的电压和电流钳位或DUT板损坏等。然后,针对此类现象的发生,提出了在测试过程中应采取的相应措施,从而有效地保证产品质量。     

一种改善LED背光亮度均匀性的新型反射膜研究

在LCD的LED背光腔体的底面设计了新型曲面形状及性能的反光膜,将扩散膜反射回灯腔底部的光重新反射回出光口以改善亮度均匀性能;在侧面设计了镜面反射膜,将位于LED矩阵边缘区域由LED射向灯腔侧壁的光反射重新射向出光口,增加了LED背光边缘区域的亮度,从而改善了背光边缘区域较暗的亮度不均匀状况.根据此类反射膜的设计完成了反射膜的制备,并应用于38 cm LED背光源样品.测试结果显示,设置反射膜的LED背光的亮度均匀性值为10.2%,明显优于未设置反射膜的值16.8%,亮度提高了29%左右,表明该种新型反射膜可以提高亮度并改善亮度均匀性.     

圆球微腔对水蒸汽的敏感特性仿真实验研究

研究了圆球微腔在水蒸汽传感中应用的可行性。通过测试在有/无水蒸汽的气室环境下,圆球微腔透射光谱的变化来对气室水蒸汽浓度情况进行传感测试。仿真实验结果显示:在有无水蒸汽干扰的条件下系统输出光强有明显的变化,即研制基于圆球微腔的传感器是可行的。     

位屏蔽多叉树搜索射频识别防碰撞算法

针对RFID树型防碰撞算法中时隙数多、数据通行量大等问题,提出了一种改进的多叉树防碰撞算法,阅读器准确检测碰撞位并向标签反馈碰撞位信息,标签对阅读器已知的ID位进行屏蔽,把ID号转换成连续碰撞的序列号.阅读器利用屏蔽位信息和标签返回的碰撞位编码信息,对标签进行分层分类搜索.通过对标签ID进行屏蔽,阅读器和标签间仅发送对方不知道的碰撞位信息.该算法减少了碰撞时隙和识别时隙,避免了空闲时隙,减少了阅读器和标签间的数据通信量.理论分析和仿真结果表明,该算法减少了系统的时隙总数和数据通信量,提高了阅读器的识别效率.     

Characteristics of gradually doped LWIR diodes by hydrogenation

The hydrogenation effects on HgCdTe diode performance are presented and the mechanism of hydrogenation is revealed. By the hydrogenation, R₀A is increased by 30 times and photo-response is also improved. It is supposed that these are explained by the increased minority carrier lifetime by the hydrogenation. However, it is found from LBIC measurements that the minority carrier lifetime doesn’t increase by the hydrogenation. An important clue that explains the hydrogenation effects is found from Hall measurements. It is found that, after the hydrogenation, the doping concentration of Hg-vacancy doped substrate decreases and the mobility increases. For the heavily hydrogenated bulk substrate, it is also found that the hydrogen passivates the whole Hg-vacancy and reveals the residual impurity and p-type doping concentration is exponentially graded. From these measurements, the diffusion current model of gradually doped diode is proposed. This model shows that the diffusion current of the graded junction diode is 2 orders of magnitude smaller than that of the abrupt junction diode, which clearly explains the R₀A increase by the hydrogenation. Medicisimulation to investigate the change of LBIC signal by the doping grading also coincides with the measurements. From these measurements and model, the hydrogenation effects are attributed to the grading of Hg-vacancy doped p-type substrate by the diffused hydrogen.     

RFID相关技术专利分析(三)

RFID技术作为一项重要的非接触式识别枝术,近来发展迅猛。本文对RFID天线相关的技术进行了专利战略分析,主要包括:RFID天线相关整体行业分析、RFID标签天线和制造工艺等三个方面,分析了如下主要指标:申请年度发展趋势、主要申请人地区分布、IPC分布、DWPI分布、主要申请人分布、核心专利排名、专利地图。根据分析结果,本文给出了分析结论,对相关企业在专利利用、保护和管理方面给出了建议与对策。     

Fabrication of holographic 3-D polymeric photonic crystals in near-infrared band and study of its optical property

A three-sidewalls-prism holographic method has been provided for the fabrication of 3-D fcc-type polymeric photonic crystal using negative photoresist. Special fabrication treatment has been introduced to ensure the stability of the fabricated nanostructures. The scanning electronic microscopy （SEM） and the diffraction results testified the good dependability of the fabricated structures. The simulation of the partial band structure is in good agreement with the transmission and reflection spectra obtained by Fourier transform infrared spectroscopy.     

Analysis of impurity concentration distributions in pulled semiconductor crystals

InSb and GaSb single crystals were grown by the Czochralski method. The impurity concentration distribution in the melt and crystal was investigated experimentally and computationally as a function of the interface segregation coefficient, the shape of the solid-liquid interface and the growth rate. It was found that the impurity concentration distribution in the melt was largely influenced by the interface segregation coefficient; the impurity concentration in the crystal increased as the shape of the solid-liquid interface became more planar and also as the growth rate increased; the impurity concentration was more markedly influenced by the growth rate than by the shape of the solid-liquid interface. When the growth rate was large, the impurity concentration increased and the shape of the solid-liquid interface was concave toward the melt near the crystal periphery. When the growth rate was small, the impurity concentration decreased and the shape of the solid-liquid interface was convex toward the melt.