This paper aimed to solve the problems that traffic detector which was used in china,can't satisfies the multifunction and high-accuracy needs of the domestic traffic survey and traffic volume measurement.We designed a traffic detection system based on laser and piezoelectric technologies,which is made up of laser speed sensor,laser scanning sensor,piezoelectric axle shaft sensor,data acquisition unit,software system and server,and their application was discussed in detail.The working principles of laser speed sensor,laser scanning sensor,piezoelectric axle shaft sensor were presented,and the detection parameters of the system were put forward.The whole structure and data processing flow of software system were also pointed out.Through test verification,the multifunction and high-accuracy characteristics of the system were verified.This traffic detection system has great significance for enhancing the research level of the domestic traffic survey and traffic volume measurement.

关键词：交通检测；激光技术；压电技术；设计

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Services running in the cloud face threats from several parties, including malicious clients, administrators, and external attackers. CloudProxy is a recently-proposed framework for secure deployment of cloud applications. In this thesis, we present the rst formal model of CloudProxy, including a formal speci cation of desired security properties. We model CloudProxy as a transition system in the UCLID modeling language, using term-level abstraction. Our formal speci cation includes both safety and non-interference properties. We use induction to prove these properties, employing a back-end SMT-based veri cation engine. Further, we structure our proof as an \assurance case", showing how we decompose the proof into various lemmas, and listing all assumptions and axioms employed. We also perform some limited model validation to gain assurance that the formal model correctly captures behaviors of the implementation.

关键词：云代理;云应用;形式化模型;建模语言

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Data management in data aware self-organizing networks (DASNs) such as wireless sensor networks (WSNs), mobile ad hoc networks (MANBTs) and so on, whose fundamental paradigm is data aware computing, is currently on the spot as one of the priority research areas and research activities are booming recently. At a borderline of changing DASN configuration, data evolve over time. Thus investigating data awareness emerges as a need, on the one hand, for managing data in DASNs, but on the other hand, for modeling, specifying, programming, and verifying DASNs. Moreover, a well-established foundation of data aware computing in such self-organizing networks becomes a requirement. Hence in this paper, we first construct algebraic models for DASNs. Second, algebraic model of data streams is developed and quantitative behaviors for data streams in DASNs are computed. Third, using algebraic models for DASNs we form monoids of data aware self-organizations and shape streams of data aware self-organizations. Finally, a category of data aware self-organizations monoids is established and streams of data aware self-organizations monoids are considered.

关键词：数据意识；自组织网络；MANETs；数据流；流演算

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This paper proposes a sm art domestic gateway used to manage power consumption,which realizes the interoperability across wireless sensor network (WSN),Wi-Fi and Internet.This system achieves smart home power consumption management.The implementation of hardware and software of the gateway has been explained in detail.

关键词：国内智能网关；AT9G45；Web服务

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关键词：工商总局；电商；“约法三章”；无理由退货

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关键词：补贴下降；本土手机；洋品牌

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随着互联网的普及，特别是移动互联网的日益广泛，网络中立问题仍然是热点问题，从美国逐步扩展到全球其他地区，如亚洲、欧洲和南美洲等。目前网络中立问题主要聚焦在对运营商网络管理策略合法性的争论之上，特别是对OTT服务的管理问题。由于OTT应用不断涌现，给电信运营商网络带来很大压力，多国运营商采取措施应对OTT。

关键词：网络中立；OTT；流量管理

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关键词：联通；4G；国际漫游业务

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关键词：前列腺癌；血清；脱氧核糖核酸；前列腺

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Time synchronization plays a central role in the design of reliable distributed embedded systems. However, the clocks of nodes that are time-synchronized are only guaranteed to be equal within a certain tolerance. Thus, when modeling and verifying distributed protocols that involve or rely upon time synchronization, abstractions are needed that accurately capture the notion of systems being “almost synchronized.” In this paper, we present the concept of approximate synchrony, a modeling and verification abstraction for time-synchronized systems. Approximate synchrony is a sound and tunable abstraction. We have implemented approximate synchrony as a part of a model checker and used it to verify the Best Master Clock (BMC) algorithm, the core component of IEEE 1588 precision time protocol and the time-synchronized channel hopping protocol that is part of the IEEE 802.15.4e standard.

关键词：时间同步系统；分布式嵌入式系统；信道跳频协议

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