Based on phase-sensitive optical time domain reflectometer (Φ-OTDR), an oil and gas pipeline pre-warning system is demonstrated and applied to monitor products pipeline laying along an optical cable. Theoretically, the longest monitor distance can be as long as the coherent length of light source through connecting repeater optical amplifiers, which can amplify not only pulse light but also Rayleigh scattering light. An appropriate algorithm derived from support vector machine (SVM) is developed to identify and classify different vibration signals along pipeline, including artificial digging, mechanical excavation and vehicles crossing. Field test in Gangzao pipeline shows that the pre-warning system can detect artificial digging within 5m, mechanical excavation and vehicles crossing within 50m.
Proc. SPIE. 5284, Wireless Communications and Networks
KEYWORDS: Data modeling, Control systems, Data transmission, Computer simulations, Relays, Dynamical systems, Wireless communications, Computer architecture, Network architectures, Mobile communications
In current research on mobile ad-hoc networks, protocol evaluation is always needed. However, building real test-beds are costly, and sometimes infeasible, especially for large-scale mobile ad-hoc networks. Therefore, simulation systems are provided. Unfortunately, exiting simulation systems have obvious defects. They can hardly support scalability or real-time simultaneously, neither changeable network nodes. To remedy these problems, we propose a test system named ManTS in this paper. With distributed architecture and some novel mechanisms, such as Direct Transmission and Virtual Application Traffic, etc., ManTS is able to build testbeds for large-scale mobile ad-hoc networks and guarantee real-time at the same time, and it also supports dynamic enrolment of network nodes. Furthermore, IP or upper layer protocols and applications implemented on Linux can run on ManTS without any modification.
With the fast development of Internet and wireless and mobile communication technology, the Mobile Internet Age is upcoming. For those providing Mobile Internet services, especially from the view of ISP (Internet Service Provider), current mobile IP protocol is insufficient. Since the Mobile IPv6 protocol will be popular in near future, how to provide a secure mobile IPv6 service is important. A secure mobile IPv6 network access system is highly needed for mobile IPv6 deployment. Current methods and systems are still inadequate, including EAP, PANA, 802.1X, RADIUS, Diameter, etc. In this paper, we describe main security goals for a secure mobile IPv6 access system, and propose a secure network access system to achieve them. This access system consists of access router, attendant and authentication servers. The access procedure is divided into three phases, which are initial phase, authentication and registration phase and termination phase. This system has many advantages, including layer two independent, flexible and extensible, no need to modify current IPv6
address autoconfiguration protocols, binding update optimization, etc. Finally, the security of the protocol in this system is
analyzed and proved with Extended BAN logic method, and a brief introduction of system implementation is given.
Computing today is becoming pervasive. To provide pervasive computing environments flexible, dynamic and less distractive security mechanisms, trust managements are introduced. However, current trust frameworks are designed for specific scenarios and can’t fulfill requirements in different environments, which leads to that these trust frameworks can’t be deployed in different environments and pervasive devices can’t enjoy pervasive computing anywhere really. To remedy this problem, this paper proposes a universal trust framework. In our framework, the flexible attribute vector model is used to represent trust evidence that are needed to evaluate trust relationships, thus the framework can work in identity-based trust environments as well as context-based trust environments. Besides,
the universal trust framework defines four kinds of trust relationships that are suitable o model trust relationships in
various scenarios. In a word, the proposed universal trust framework is an especially designed trust framework that can unify trust management in different pervasive computing cases.
Project background: we are engaged in research on service management for mobile Internet. It is well known that Internet will primarily become a service-driven-network, and services will be differentiated. The motivation for service management is to make service management automation, and the users will discovery all kinds of services provided by service providers conveniently. In order to reach theses goals, the one of the key issues for service description, or service
definition must be resolved. So, we research below three aspects’ issues: the firstly, the application services are classified, all the properties for every type of service are researched. Secondly, in order to model the service data model, we build the meta-model to describe the service data model, based on these meta-models, a general service data model is built in a kind of oriented-object modeling language, EXPRESS. Finally, based on the service data model described by EXPRESS and the definition for service template, a concrete service template can be generated by a tool for generating
service template automatically.