生物识别技术在机场安保领域的应用

美国9·11事件使航空保安领域成为人们关注的焦点,各国政府纷纷增加科技投入,提高航空保安领域的科技水平,以保证航空运输的安全、高效,从而使以生物识别技术为代表的一批高科技产品在航空保安领域获得了广泛关注和应用。本文就生物识别技术在国内外机场安保领域的应用现状进行了分析、总结,并对生物识别技术的发展前景进行了展望。     

机场公安机关与政府监管部门的空防安全职责辨析

民航各机场公安机关的空防安全职责定位模糊,特别是与地区管理局公安局及安全监督管理办公室空防处之间的责任划分不明确,是当前困扰机场公安机关的重要问题之一,也影响了民航安全保卫整体工作的进展。     

空管系统信息安全保障体系初探

空管业务系统和办公系统,大部分是依托ATM网络组成的相对封闭的系统,与公网没有物理连接,使用者绝大部分是空管系统内部人员,少量的电报终端用户分布在航空公司和机场等单位。大家的思想中认为目前的这种网络结构是安全的,外界的非法入侵没有途径可以进入,信息安全问题是无需担心的,因此在各个系统的建设规划中,     

Stratasys 3D打印世界

3D打印机又称Rapid Prototype (简称RP),是“快速原型制造技术”具体的运用.Stratasys两种先进3D打印技术Stratasys创始人Scott Crump于20多年前发明了热溶解积层技术(Fused Depositong Madeling,FDM),自此Stratasys 3D打印技术走在变革的前沿.FDM使用两种材料来执行打印作业:用于构成成品的建模材料和用作支架的支撑材料.3D打印机的FDM(热熔沉积成型法)技术原理上并不会太艰深困难,传统制造业的加工方法是在原始材料上做切销的减法,与之不同,3D打印所遵行的是加法堆栈的原则.比起传统的模型制作,不但避免错误,而且可以节省大量的开发时间成本与材料成本.     

FINDER, a system providing complex decision support for commercialtransport replanning operations

Decision-aid systems, likely to appear in future aircraft generations, could play a central role in the cockpit thanks to the broad spectrum of functionalities and decision support facilities they will offer to the crew. As part of such systems, the exploratory FINDER mock-up is a knowledge-based system (KBS) designed to help crew members continually optimize their flight plan by suggesting solutions considering exhaustive information related to flight context, either on pilot request or upon external information occurrence. The successful evaluation by AIR FRANCE pilots of that first mock-up dedicated to diversion procedure on pilot request has led to the current development of an enhanced system with nominal Enroute operations and real-time capabilities. Nominal Enroute operations concern the optimization with respect to an evolutive constraining or favouring environment (due to weather, traffic or regulated areas, ETOPS constraints). This study paves the way for a future Flight Assistant System concept which is already under investigation and may take place in SEXTANT Avionique's future development steps     

Applying automation to spacecraft mission operations

This study was initially undertaken to understand how commonalities among the application of proven automation processes such as aircraft control, nuclear power generation, auto manufacturing, etc. could be applied to spacecraft operations at NASA. These industries applied automation to reduce human repetitive task and mitigate risk, rather than create complete "lights out" operations as was the goal at NASA.     

创新安检管理思路 提高安全防范能力

随着全球恐怖威胁程度的不断提高,民航面临的反恐形势也日趋严峻,如何创新安检管理思路,通过研究、探讨、建立一套行之有效的安全防范体系,将各项工作标准及要求落到实处,打造一支政治可靠、素质过硬、特别能战斗的安检队伍,提高安全防范能力,适应新形势下的安保工作要求,是一项十分紧迫而重要的任务。下面我将从安检队伍基本建设、安检工作职能变化及可持续发展三个软件方面的规划建设进行简单阐述。一、抓好基础工作建设,提高日常管理水平不断加强队伍建设,提升管理水     

全面提升机场品质 打牢枢纽建设基础

2012年将是沈阳机场发展历程中极不平凡的一年,站在千万级大型机场的新起点上,我们要认真落实科学发展观,以枢纽运作为中心,以持续安全为根本,以品质提升为灵魂,以重组创新为动力,固根本、提品质、强管理、促发展,为建设东北亚门户航空枢纽奠定坚实基础,进一步开创机场建设新局面。一、以生产效益为中心,开拓市场,提升营销品质今年沈阳机场航空主业的生产目标是,实现机场运输飞行起降8.3万架次,旅客吞吐量1150万人次,货邮吞吐量     

机场容量评估——提高机场空域运行效率的利器

目前我国民航正处于快速发展时期,随着飞行架次数的持续增长,相应对机场基础设施建设规模和机场空域容量的需求也不断加大。机场空域运行容量、机场改扩建方案和空域规划方案评估等多个新兴业务方向亟待科学的实施手段。中国民航科学技术研究院(以下简称航科院)已经率先与拥有十余年机场容量评估经验的杰普逊公司     

姊妹机场伊斯坦布尔机场向上海机场捐赠十万只医用口罩

2月3日13:24,姊妹机场伊斯坦布尔机场管理集团向上海机场集团捐赠的十万只医用口罩抵达上海虹桥机场。上海机场集团董事长秦云表示,感谢土耳其朋友不远万里的援助,我们将把该批物资全部用于疫情防控一线人员的安全防护。     

Systems approach to the satellite operations problem

It is noted that the projected increase in satellites needed to satisfy future military, scientific, and commercial missions will soon be overwhelming current ground-operations capabilities. An intelligent processing architecture, IntelliSTAR, that addresses the potential of automating the entire satellite operations domain (planning, scheduling, execution, and analysis) is discussed. The architecture has been developed with flexibility in mind. In particular, IntelliSTAR has been structured to allow for development and validation on the ground, prior to deployment in space. The overall architecture is described, with particular emphasis placed on the scheduling of satellite missions     

Heuristics of node selection criteria to assess robustness of world airport network

The world airport network (WAN) is one of the networked infrastructures that shape today's economic and social activity,so its resilience against incidents affecting the WAN is an important problem.In this paper,the robustness of air route networks is extended by defining and testing several heuristics to define selection criteria to detect the critical nodes of the WAN.In addition to heuristics based on genetic algorithms and simulated annealing,custom heuristics based on node damage and node betweenness are defined.The most effective heuristic is a multiattack heuristic combining both custom heuristics.Results obtained are of importance not only for advance in the understanding of the structure of complex networks,but also for critical node detection.     

Measurements, visualization and interpretation of 3-D flowsapplication within base flows

Experimental investigations of the flow field in the near-wake of axisymmetric afterbodies at an angle of attack of 5° are reported. Models consists of a cylindrical afterbody and a conical boat tail. Measurements were performed by means of a 3-D frequency-shifted laser Doppler velocimeter at a free stream Mach number of 0.5. The tremendous increase of quantitative information obtained with this diagnostic technique raises the problem of reducing and displaying the data in a way that avoids large amounts of numbers and curves that are not easy to interpret. An attempt is made to visualize and to describe velocity characteristics in the form of a 3-D graphic representation     

三角嵌铺粒子追踪算法的三维化扩展

针对连续帧三维流场粒子的匹配问题,对基于三角嵌铺的粒子追踪算法进行了三维化扩展并将其命名为3DT PTV。3DT PTV遵循从粒子样型匹配到粒子匹配的原则,即粒子匹配结果从粒子样型匹配结果中总结。首先通过自定义"粒子样型DT网格"实现了粒子样型匹配的参数无依赖性,使3DT PTV适用于粒子非均匀分布流场;其次通过自定义"样型唯一性标识向量"进行粒子样型匹配;最终通过"双向计算-概率择优"模块对样型匹配结果进行样本扩展并整合出粒子匹配。通过添加自定义干扰的JPIV人工流场对3DT PTV进行了检验。除了算法本身的简洁性,结果亦证明了3DT PTV处理粒子无匹配率较高的复杂流动的良好特性。     

用MFC开发 OpenGL的三维图形功能

OpenGL是目前国际流行的开放式图形标准 ,它具有功能强大的三维图形库 ,而VisualC 6 .0具有完善的MFC和AppWizard ,如何将二者完美地结合在一起 ,在Win32环境下开发出高品质的三维图形应用程序是一个值得深入研究的课题。本文介绍了作者在工程实践中利用MFC开发OpenGL三维图形功能的关键技术。     

Unified approach to missile guidance laws: a 3D extension

Since the proportional navigation guidance law was first introduced, many of the researchers had proposed different methodologies to investigate the corresponding performances of all the existing guidance laws. Even though a unified approach was proposed a few years ago, other authors found that under the proposed framework, all the existing guidance laws, namely ideal proportional navigation (IPN), true proportional navigation (TPN), and pure proportional navigation (PPN), were indeed special cases of the mentioned general guidance law. However, the results were restricted to two-dimensional space. In this paper, the author not only extends the results to three-dimensional space, but also to general IPN (GIPN), general TPN (GTPN), and PPN. Unlike conventional researchers, a modified polar coordinate (MPC) is adopted. It is shown that with the property of this MPC, for the line of sight (LOS) based guidance laws (GIPN and GTPN) the number of differential equations required to fully describe the relative dynamics can be reduced from six to three, however, for the missile's velocity-based guidance law, i.e., PPN, five differential equations are required. All the terms of differential equations involve only products and additions of variables. For all the mentioned guidance laws in this paper, only two transformed variables are required to describe the capture region, while the third variable is required to provide the condition of finite turn rate.     

Relationship of coronal transients to interplanetary shocks: 3D aspects

More than 1000 coronal mass ejections (CMEs) caused by different types of coronal transients have been analyzed up to now, based on the images from white light coronagraphs on board the OSO 7, Skylab, P78-1, and SMM spacecraft. In many cases, the CME images lead us to the impression of loop-like, more planar structures, similar to those of prominence structures often seen in H pictures. There is increasing evidence, though, for a three-dimensional bubble- or cloud-like structure of CMEs. In several cases, CMEs directed toward the earth (or away from it) were identified, as their outer fronts emerged on all sides of the coronagraph's occulting disk, thus suggesting a bubble-like appearance.There now appears to be unanimity about the crucial role that magnetic reconnection plays during the transient process. Recently, direct evidence was found for the pinch-off of CMEs, both from optical observations and from in situ measurements of isolated magnetic clouds' following transient shock waves. However, the detailed sequence of events during the generation of a CME is still unclear.Interplanetary shock waves associated with the CMEs are usually restricted in latitudinal extent to about the angular width of the optically observed CMEs. They may be somewhat less restricted in longitudinal extent. A nearly 1 1 association between CMEs and shock waves measured in situ from spacecraft (Helios 1 and 2, IMP 7 and 8, ISEE 3, Pioneer Venus) can be established, provided the CME and the spacecraft were in the same longitudinal and latitudinal range and the CME speed exceeds 400 km s^–1. Around the past solar activity minimum all CMEs observed were centered at solar latitudes of less than 60°. Around solar maximum, a significant fraction of CMEs also originated from the polar regions. Thus, there is a good chance that the Ulysses spaceprobe will encounter many shocks caused by both low- and high-latitude CMEs, when it finally starts its journey over the Sun's poles.     

3D guidance law modeling

Proportional navigation (PN) guidance laws (GLs) have been widely used and studied in the guidance literature. But most of the guidance literature on PN has concentrated on the evaluation of empirical PNGLs or GLs obtained from very specific optimality considerations. The authors present a novel approach (called guidance laws modeling) to derive new GLs. They consider the basic requirements of capture and define a complete class of GLs that meet these requirements. It is shown that PN is a natural candidate in this class. The main consequence of this modeling process is the definition of two new GLs: one in 2D space and the other in 3D space. These new GLs can be interpreted as new generalizations of the true proportional navigation (TPN) GL. Moreover, it is shown that these generalizations allow the TPNGL to match the capturability performance of the pure proportional navigation (PPN) GL in terms of initial conditions which allow the guided object to reach its target