A TrustEnclave-Based Architecture for Ensuring Run-Time Security in Embedded Terminals

The run-time security guarantee is a hotspot in current cyberspace security research,especially on embedded terminals,such as smart hardware as well as wearable and mobile devices.Typically,these devices use universal hardware and software to connect with public networks via the Internet,and are probably open to security threats from Trojan viruses and other malware.As a result,the security of sensitive personal data is threatened and economic interests in the industry are compromised.To address the run-time security problems efficiently,first,a Trust Enclave-based secure architecture is proposed,and the trusted execution environment is constructed by hardware isolation technology.Then the prototype system is implemented on real Trust Zone-enabled hardware devices.Finally,both analytical and experimental evaluations are provided.The experimental results demonstrate the effectiveness and feasibility of the proposed security scheme.     

基于OPC UA客户端/服务器的现场设备集成

目前存在着两大设备集成技术EDDL和FDT,它们虽然采用不同的方式实现现场设备集成,但它们之间有过多的技术重合,以至于EDDL和FDT之间竞争愈演愈烈.因此,不管是设备制造商还是系统开发商或者最终的用户,都需要有一个统一的标准化的设备集成方案来完成现场设备的集成.通过对EDDL和FDT的两大设备集成技术的研究,提出了在OPC UA客户端/服务器的结构下的设备集成方案现场设备集成-FDI.现场设备集成有益于设备制造商和系统开发商,更方便了最终用户.     

医疗器械电子商务平台分析与设计

随着网络的完善与发展,医疗器械销售企业要想跟上时代的步伐,与时俱进就必须要开展网上电子商务。本平台的开发主要是将ASP（Active Server Page）,与ACCESS的结合。通过ASP平台建立于后台ACCESS的连接,实现了前后台的交互,从而完成了平台的运行。全文按照结构化的开发方法,进行开发,基本上遵循了结构化开发方法的各个步骤。     

Preinstalled application policies of smart device firms

Recent technological advancements in smart devices have paved the way for a booming mobile commerce industry. As smart device vendors launch products with a rich variety of business applications, it is critical for all stakeholders to understand the attitudes of different vendors toward preinstalled applications in the smart device industry. We address this issue by exploring an analytical model for preinstalled application policies. Specifically, we study how to choose an optimal policy in a market with hypercritical consumers who have disutility from preinstalled applications, and expert consumers who have removal knowledge. The results show that, as marginal preinstallation income increases, firms tend to force more consumer segments to use preinstalled applications. By comparing monopolistic and competitive situations, we find that the advantages of the policy change are different, and competitive firms prefer to adopt more stringent policies than monopolistic firms when the marginal preinstallation income is smaller. The initiative of expert consumers introduced new findings to the research. The increase in such consumers may lead to an increase in the profits of monopolistic firms when they adopt a preinstallation policy with a low removal threshold, but this has no impact on the profits of competitive firms. Additionally, an increase in such consumers will lead competitive firms to choose to bundle applications when the marginal preinstallation income is smaller and the impact on monopolistic firms’ policy decisions is morecomplex.     

Li-intercalation in Silicon Anodes: A Challenging Route Towards 3D-Integrated All-solid-state Batteries

1 Results Micro-batteries are expected to become more and more important in numerous small-sized devices,like medical implantables,biosensors,hearing aids and autonomous network devices.Characteristic for these electronic applications is that they have to operate autonomously and reliably.Due to these requirements thin film power sources need to be rechargeable,mechanically stable for a long period of time and have a long cycle life.As the average energy consumption of these future devices will be rathe...     

发电厂电气主系统培训仿真实用模型

针对发电厂电气主系统培训仿真的建模问题,介绍了把发电机的一次调频特性作为分配因子的动态潮流方法。它很好地反映了由于有功扰动引起的系统频率变化特性。在考虑发电机的励磁调节特性的问题上对不同的励磁调节装置提出了相应的建模方法。给出了一种发电机饱和特性的解析算法,用以计算发电机的励磁电流。在一个实际的１２５０ＭＷ容器发电机组的大型发电厂电气培训仿真系统中,验证了这些方法的有效性。     

日盲紫外光通信系统关键器件

要谈到的紫外光通讯系统是自由空间光通讯的一种．民用的自由空间光通讯用到的一般都是红外光作为传输介质．然而,在军事领域,如果要建立一个抗截获、抗干扰、安全隐密的小范围通讯系统（方圆1．5km左右）就不能使用红外光．经过前人的不断探索和努力,发现紫外光,特别是日盲光谱波段的紫外光是一种很好的传输介质．由于空气的吸收以及在大气中的散射作用,使得紫外光有比较合适的传输距离和跨越障碍的能力．文中重点讲述的是系统的一些关键器件．     

Charge- and size-based separation of macromolecules using ultrathin silicon membranes

Commercial ultrafiltration and dialysis membranes have broad pore size distributions and are over 1,000 times thicker than the molecules they are designed to separate, leading to poor size cut-off properties, filtrate loss within the membranes, and low transport rates. Nanofabricated membranes have great potential in molecular separation applications by offering more precise structural control, yet transport is also limited by micrometre-scale thicknesses. This limitation can be addressed by a new class of ultrathin nanostructured membranes where the membrane is roughly as thick (approximately 10 nm) as the molecules being separated, but membrane fragility and complex fabrication have prevented the use of ultrathin membranes for molecular separations. Here we report the development of an ultrathin porous nanocrystalline silicon (pnc-Si) membrane using straightforward silicon fabrication techniques that provide control over average pore sizes from approximately 5 nm to 25 nm. Our pnc-Si membranes can retain proteins while permitting the transport of small molecules at rates an order of magnitude faster than existing materials, separate differently sized proteins under physiological conditions, and separate similarly sized molecules carrying different charges. Despite being only 15 nm thick, pnc-Si membranes that are free-standing over 40,000 microm2 can support a full atmosphere of differential pressure without plastic deformation or fracture. By providing efficient, low-loss macromolecule separations, pnc-Si membranes are expected to enable a variety of new devices, including membrane-based chromatography systems and both analytical and preparative microfluidic systems that require highly efficient separations.     

Environmental effects of information and communications technologies

The digital revolution affects the environment on several levels. Most directly, information and communications technology (ICT) has environmental impacts through the manufacturing, operation and disposal of devices and network equipment, but it also provides ways to mitigate energy use, for example through smart buildings and teleworking. At a broader system level, ICTs influence economic growth and bring about technological and societal change. Managing the direct impacts of ICTs is more complex than just producing efficient devices, owing to the energetically expensive manufacturing process, and the increasing proliferation of devices needs to be taken into account.     

基于AHP和群决策的船舶设备合格供应商评价指标体系构建

在层次分析法(AHP)的基础上,采用系统聚类分析的原理对群决策中的专家进行了分类并赋予权重,建立船舶设备合格供应商评价指标体系,并进行了实证运算,实现对合格供应商的科学评价与判断。     

低剂量辐照条件下的MOSFET因辐照导致的阈值电压漂移的模拟

推导了MOSFET器件阈值电压漂移与辐照剂量和辐照剂量率之间的解析关系,模型计算结果与实验吻合较好。该模型物理意义明确,参数提取方便,适合于低辐照总剂量条件下的MOS器件与电路的模拟。并进一步讨论了MOSFET的辐照敏感性。结果表明,尽管PMOS较之NMOS因辐照引起的阈值电压漂移的绝对量更大,但从MOSFET阈值电压漂移量的摆幅这一角度来看,在低剂量辐照条件下NMOS较之PMOS显得对辐照更为敏感。这一研究结果可能为辐照剂量学提供新的应用思路。     

深化分析化学实验教学改革培养创新人才

阐述了分析化学实验教学当中存在的几个问题,通过转变教育观念,改进实验教学方法和手段,更新实验内容,完善考核制度,提高实验技术人员素质等方面的改革,调动了学生的实验积极性,培养了学生的创新意识和创新能力．     

双导层结构横向功率器件的导通电阻模型及应用研究

横向高压器件是智能功率集成电路的核心器件,而漂移区结构参数是影响器件导通和击穿性能的重要因素。为此,提出了LDMOS三种经典结构的导通电阻模型并研究了漂移区结构参数对导通电阻的影响,它们分别是:Single RESURF,Double RESURF,Dual conduction layer结构。然后借助这些模型研究了漂移区掺杂浓度、漂移区长度、漂移区厚度对器件导通电阻的影响。利用MATLAB计算相同器件参数下模型的解析结果。对比模型的解析结果和仿真结果,发现解析结果和仿真结果基本一致,证明了解析模型的正确性。     

工控软件在自动化系统中的应用

自动化系统大量使用的各种自动化器件如PLC、变频器、数字仪表、电动执行机构、智能板卡等,用系统集成技术构成的DCS(Digital Control System),在提高企业的自动化程度的同时,也为产品的产量、品质、更新提供了技术平台。系统集成技术还在不断创新中,工控软件提供了实现系统集成的手段。     

电力系统网络拓扑的分析与比较

电力系统仿真是分析电网结构,潮流计算的重要手段。采用面向对象技术（OOT）进行电网建模,类型明确,方便添加新设备。通过对电力系统网络拓扑技术的较深入的研究和探讨,对比各类分析方法原理,对同样的系统进行实际分析得出,广度优先搜索法对于各种网络都可以快速进行拓扑分析。     

一种基于SNMP网络设备监测系统的设计与实现

随着人们对网络可靠性和安全性要求的提升,旨在设计实现一个软件系统对网络设备运行情况进行监控,且在设备出现故障后能够及时、自动地向网络管理员告警.另外还为网络管理员提供一种方便的途径,来查看网络设备的状态信息.     

一种低功耗的6LoWPAN网络动态路由协议

低功耗是设计和组建无线传感器网络时需要考虑的首要因素.目前提出6LoWPAN动态路由协议大多属于Ad-hoc路由协议的简化版,若要很好地满足低功耗的要求,尚需进一步的研究和改进,为此,文中提出了一种低功耗的路由协议,并且已在实际设备中试用,获得了较好的效果.     

蒙特卡罗模拟双环双散射体质子束流扩展

束流扩展是研究大体积深度肿瘤的基础,利用Monte Carlo多粒子模拟软件Fluka,计算质子经过双环双散射体后束流分布特性,在束流扩展半径相同的条件下,与解析计算相比较。结果表明:Fluka计算得到的第一散射体的厚度小于解析计算得到的结果,散射膜薄的条件下二者符合好于散射膜厚的条件。束流扩展半径随着两个散射体厚度的增加而增大,束流利用率先增加后减小,最大值是27%。     

工业对象模拟实验系统的研制

提出了采用计算机技术设计工业对象模拟系统的工作原理和设计方案，给出了基于该系统的实验环境的构成。工业对象模拟系统可以在没有实际工业被控对象的情况下，为控制装置提供模拟的工业常用被控对象，对控制装置的软硬件设计进行验证。被控对象的工艺流程、工艺参数等可以以图形、表格、曲线、动画的形式形象直观地显示在计算机屏幕上。     

A Novel Analysis of Delay and Power Consumption for Polling Schemes in the IoT

In the Internet of Things(IoT), various battery-powered wireless devices are connected to collect and exchange data, and typical traffic is periodic and heterogeneous. Polling with power management is a very promising technique that can be used for communication among these devices in the IoT. In this paper, we propose a novel and scalable model to study the delay and the power consumption performance for polling schemes with power management under heterogeneous settings(particularly the heterogeneous sleeping interval). In our model,by introducing the concept of virtual polling interval, we successfully convert the considered energy-efficient polling scheme into an equivalent purely-limited vacation system. Thus, we can easily evaluate the mean and variance of the delay and the power consumption by applying existing queueing formulae, without developing a new theoretical model as required in previous works. Extensive simulations show that our analytical results are very accurate for both homogeneous and heterogeneous settings.