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1.
第十一届ILOPE展会于2006年12月5-7日在北京召开,此次展会包含了一个光电展览,四个技术/产业论坛和一个中外贸易交流会.吸引了来自14个国家近400家参展商,展出面积达1万多平米.国内主流的激光、光学和红外厂商悉数到场,同时国外FLIR、光谱物理、相干、镭宝、贰陆、HGH、Senko、美国Photonics、尼康等国际知名企业也携新产品、新技术参与.  相似文献   

2.
In this paper,we focus on inferring graph Laplacian matrix from the spatiotemporal signal which is defined as“time-vertex signal”.To realize this,we first represent the signals on a joint graph which is the Cartesian product graph of the time-and vertex-graphs.By assuming the signals follow a Gaussian prior distribution on the joint graph,a meaningful representation that promotes the smoothness property of the joint graph signal is derived.Furthermore,by decoupling the joint graph,the graph learning framework is formulated as a joint optimization problem which includes signal denoising,timeand vertex-graphs learning together.Specifically,two algorithms are proposed to solve the optimization problem,where the discrete second-order difference operator with reversed sign(DSODO)in the time domain is used as the time-graph Laplacian operator to recover the signal and infer a vertex-graph in the first algorithm,and the time-graph,as well as the vertex-graph,is estimated by the other algorithm.Experiments on both synthetic and real-world datasets demonstrate that the proposed algorithms can effectively infer meaningful time-and vertex-graphs from noisy and incomplete data.  相似文献   

3.
人不可能两次迈进同一条河流,而8848却似乎可以。近段时间,因为速达的“收购传闻”,8848再一次成为业界关注的焦点。因为如今的8848内部风雨飘摇,外部官司缠身,它有何被收购的价值?公司总裁吕春维为何早早投怀送抱、急于为收购造势?谁是这一出“收购闹剧”的幕后主使?在诸多疑问背后,很少有人能看清事情本质。老8848的创始人王峻涛知道,但他不说,因为此8848已非当年之彼8848。几年前,盛极一时的老8848就是这样被幕后资本强行拉入分拆和兼并的资本游戏,被胜利冲昏头脑的大股东妄图运用资本力量主导企业发展,对他们来说,更重要的是上市圈钱。但因为牵扯的利益太多,诱惑太多,8848的发展最终陷入极度迷茫中,在资本疯狂追逐最大利益的时候,企业却错过了发展的最佳时机,并从此一步步走向衰微。6年来,8848经历了最辉煌的巅峰时期,同样也经历了无数是是非非。即使当时剩下的钱仍可使8848运营数十年,但是,商人们已经对8848的未来失去了耐心与信心,老8848最终难逃遭清算厄运。后来,所谓“王者归来”的新8848更是虚有其表,连核心业务也惹上纠纷,最后股东终于按捺不住……现在经常有人问王峻涛,如果当时不要上市,如果当时不分拆,如果……但王说:假设没有意义,我懂得了一点:创业者要坚持、坚持、再坚持。张朝阳也说:做自己的,不要听华尔街的。或许这就是本文要寻找的答案。  相似文献   

4.
兰天  黄霞 《IT时代周刊》2005,(12):67-69
3G谈判受阻的主要原因是在谈判中,电信研究院作为一家研究机构实力太弱,如果能聘请外国在专利谈判上有丰富经验的律师或律师行主谈,加上中国政府的免费授权政策和运营商有关采购3G设备政策的出台,专利谈判可能是另外一个结果。  相似文献   

5.
Passive detection of moving target is an important part of intelligent surveillance. Satellite has the potential to play a key role in many applications of space-air-ground integrated networks(SAGIN). In this paper, we propose a novel intelligent passive detection method for aerial target based on reservoir computing networks. Specifically, delayed feedback networks are utilized to refine the direct signals from the satellite in the reference channels. In addition, the satellite direct wave interference in the monitoring channels adopts adaptive interference suppression using the minimum mean square error filter. Furthermore, we employ decoupling echo state networks to predict the clutter interference in the monitoring channels and construct the detection statistics accordingly. Finally, a multilayer perceptron is adopted to detect the echo signal after interference suppression. Extensive simulations is conducted to evaluate the performance of our proposed method. Results show that the detection probability is almost 100% when the signal-to-interference ratio of echo signal is-36 dB, which demonstrates that our proposed method achieves efficient passive detection for aerial targets in typical SAGIN scenarios.  相似文献   

6.
2007年11月17日22点35分.我站值班人员接到中国联通梅州分公司的电话投诉.称其在梅州城区的多个CDMA基站收到不明信号的干扰.严重影响CDMA用户的正常使用。接到投诉后.我站迅速组织技术力量查找干扰  相似文献   

7.
2007年是支付卡产业安全标准委员会(PCISSC:Payment Card Industry Security Standards Council)在世界范围内推行PCI数据安全标准(DSS:Data Security Standard)的第一个年头。我们希望通过本文的讨论,使得支付卡产业链的各个角色在未来更加重视信息安全工作,从而更为有效、全面、标准化地保护持卡人的机密信息。  相似文献   

8.
湛艳 《中国新通信》2008,10(8):21-23
有人说史玉柱是个超然独处的商业奇才,有人说史玉柱是抓住人性弱点赚钱的无良商人。无论是褒是贬,谁都无法否定史玉柱在中国市场上所造就的那些营销神话。20年前,计算机汉字处理行业正处于红红火火的时候,刚从深圳大学研究生院获得软科学管理系硕士学位的史玉柱,  相似文献   

9.
目前我国农业管理部门已经重视到电子商务对农村经济发展的重要性,农村信息化建设步伐加快,进一步促进农村电子商务发展.从对中国互联网认识和使用的群体来看,绝大部分都集中于受过高等教育的人口,虽然会有分布于农业行业的部分,但总体所占比率很低.全国各种涉农网站为实现农业增效和农民增收,每天都发布农产品供求信息.无论从交易规模、数量、还是经济效益来看,中国农村电子商务都滞后于其他领域电子商务的发展.……  相似文献   

10.
2月20日,中国空间技术研究院隆重举行建院40周年庆祝大会。中共中央政治局常委、全国人大常委会委员长吴邦国、中共中央政治局委员、中央军委副主席郭伯雄、中华人民共和国中央军委副主席、国务委员兼国防部长曹刚川、国务院副总理曾培炎、中国空间技术研究院首任院长钱学森等致贺。  相似文献   

11.
The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde.  相似文献   

12.
随着光纤通信和光纤传感的快速发展,人们时光的偏振态提出了越来越高的要求.光是一种横波,其偏振态大致分为:完全偏振光、部分偏振光和自然光.文中介绍了完全偏振光的几种表示方法,给出了几种部分偏振光的描述方法.并阐述了它们之间的差异与联系.  相似文献   

13.
解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力.  相似文献   

14.
介绍了NTRUsign签名算法的密钥生成过程,其在实现的过程中需要进行上百位的大数运算问题,这些数字远远超出了普通电脑存贮范围。而要进行大数运算,就得用数组存贮,进行模拟运算,这就大大增加了运算量。文中分析了这个算法实现过程中的运算量,分析结果说明NTRUsign的运算量过大,以致实际并非一个实用算法。  相似文献   

15.
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature.  相似文献   

16.
对影响镍镀层内应力的因素做了介绍和分析,提出了对收缩应力的一种解释,提供了排除这些因素影响的方法,指出重视镀液的管理是减少各种影响内应力因素的主要办法。  相似文献   

17.
论述了推进电子行业标准制修订项目计划管理信息化的必要性.并提出了具体措施;详细介绍了电子行业标准制修订项目计划管理数据库的设计思路和实现方法.阐述了对后续工作的几点思考.  相似文献   

18.
By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental researches of large-scale models are represented.  相似文献   

19.
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in NTE-NTM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced  相似文献   

20.
张辉 《电子测试》2013,(20):261-262
水的光学特性对光学成像质量有着重要的影响,水对光的吸收、散射作用可造成光在水介质传播中的衰减,本文就水的光学特性及其对水下光学成像质量的影响进行了分析,以为成像系统在水下的应用提供基础的理论依据。  相似文献   

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