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Context Integration for Smart Workflows

Context Integration for Smart Workflows

引用

6th ieee international conference on Pervasive computing and Communications

作者： Wieland, Matthias Kaczmarczyk, Peter Nicklas, Daniela Univ Stuttgart Inst Architecture Applicat Syst Univ Str 38 D-70569 Stuttgart Germany Univ Stuttgart Inst Parallel & Distributed Syst D-70569 Stuttgart Germany

ISBN: (纸本)9781424442362

the usage of workflow technology to model and execute business processes is widespread in many enterprises and within the software industry. With the growing maturity of sensors, wireless communication, and distributed computing environments, we can enhance this approach to enable smart workflows, which are business processes crossing the boundary to the physical world. Applications for such processes can be found in many application domains, like logistics or in smart factory environments. To realize smart workflows, workflow engines can be coupled with existing context provisioning systems. However, there is a gap between the rather low-level provisioning of context (e.g., sensor data and stock information) and the concepts needed in smart workflows (e.g., "is a spare tool available?"). the main contribution of this paper is to bridge this gap: we show how integration processes can be used to provide context information at different semantical levels for smart workflows.

关键词： distributed computer systems

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A Formal Specification and Verification Framework for Designing and Verifying Reliable and Dependable Software for Computerized Numerical Control (CNC) systems

A Formal Specification and Verification Framework for Design...

引用

28th international conference on distributed computing systems

作者： Cao, Yunan Shao, Zili Wang, Meng Xue, Chun Jason Chen, Youdong Wei, Hongxing Wang, Tianmiao Beijing Univ Aeronaut & Astronaut Robot Res Inst Beijing Peoples R China Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China City Univ Hong Kong Dept Comp Sci Kowloon Peoples R China

ISBN: (纸本)9781424431748

As a distributed computing system, a CNC system needs to be operated reliably, dependably and safely. How to design reliable and dependable software and perform effective verification for CNC systems becomes an important research problem. In this paper, we propose a new modeling method called TTM/ATRTTL (Timed Transition Models/All-Time Real-Time Temporal Logics) fir specifying CNC systems. TTM/ATRTTL. provides full supports for specifying hard real-time and feedback that are needed,for modeling CNC systems. We also propose a verification framework with verification rules and theorems and implement it with STeP and SF2STeP. the proposed verification framework can check reliability, dependability and safety of systems specified by our TTM/ATRTTL method. We apply our modeling and verification techniques on an open architecture CNC (OAC) system and conduct comprehensive studies on modeling and verifying a logical controller that is the key part of OAC the results show that our method can effectively model and verify CNC systems and generate CNC software that

关键词： CNC distributed computing system formal specification and verification TTM/ATRTTL Reliability Dependability Safety

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An enhanced sensor scheduling protocol for wireless sensor networks

An enhanced sensor scheduling protocol for wireless sensor n...

引用

28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Fu, Cheng Wang, Bang Hock, Beng Lim Intelligent Systems Centre Nanyang Technological University

ISBN: (纸本)9780769531731

An important design challenge in wireless sensor network application development is to provide appropriate middleware service protocols to control the energy consumption according to specific application scenarios. In common application scenarios such as in surveillance systems, it is usually necessary to extend the system monitoring area as large as possible to cover the maximal area. the two issues of power conservation and maximizing the coverage area have to be considered together with both the sensors' communication connectivity and their power management strategy. In this work, we proposed an enhanced sensor scheduling protocol to address the application scenario of typical surveillance systems. Our protocol takes into consideration of both power conservation and coverage ratio to search for the balance between the different requirements. We proposed both centralized and de-centralized versions of sensor scheduling protocol, and compared the performance of different protocols using several metrics. the results provide evidence of the advantages of the proposed protocol compared with existing sensor scheduling protocols. © 2008 ieee.

关键词： Wireless sensor networks

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Proceedings - the 28th international conference on distributed computing systems, ICDCS 2008

Proceedings - The 28th International Conference on Distribut...

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28th international conference on distributed computing systems, ICDCS 2008

ISBN: (纸本)9780769531724

the proceedings contain 102 papers. the topics discussed include: computer science as a lens on the sciences;real-time detection of clone attacks in wireless sensor networks;comparing symmetric-key and public-key based security schemes in sensor networks: a case study of user access control;securing wireless data networks against eavesdropping using smart antennas;on security vulnerabilities of null data frames in ieee 802.11 based WLANs;identifying frequent items in P2P systems;on the impact of mobile hosts in peer-to-peer data networks;is random scheduling sufficient in P2P video streaming?;circumventing server bottlenecks;indirect large-scale P2P data collection;detecting click fraud in pay-per-click streams of online advertising networks;exploring anti-spam models in large scale VoIP systems;distributed divide-and-conquer techniques for effective DDoS attack defenses;and mobility-assisted spatiotemporal detection in wireless sensor networks.

关键词： Network security

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Improvement of the performance of distributed OS-CFAR system by (μ+λ)-ES optimisation

Improvement of the performance of distributed OS-CFAR system...

引用

2008 5th international Multi-conference on systems, Signals and Devices, SSD'08

作者： Abdou, Latifa Soltani, Faouzi Département d' Automatique Université de Biskra Algeria Département d'Electronique Université de Constantine Algeria

ISBN: (纸本)9781424422067

Genetic algorithms (GAs) are algorithms of exploration based on natural selection and on genetic. they are very flexible tools used to optimise very irregular functions, badly conditioned or complexes to calculate. the use of reproduction operators: crossover and mutation, and also the cumulative information prune the search space and generate a set of plausible solutions. Also, other techniques based on the evolutionary strategies (ESs) are proposed in literature as heuristic optimisation techniques. In this work we propose an optimisation of distributed OS-CFAR systems parameters by both a GA and an ES in order to optimise the threshold and also to give a comparison between the two manners to achieve the best performance in detection. the results showed that sonle improvement had brought by the use of the ES according to the number of sensors in the system, the number of cells in the sensor, the Probability of false alarm (Pfa), and the fusion rule. ©2008 ieee.

关键词： Genetic algorithms

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Dynamic Update System for K Queries in Wireless sensor Networks

Dynamic Update System for K Queries in Wireless Sensor Netwo...

引用

4th international conference on Wireless Communications, Networking and Mobile computing

作者： Bajracharya, Manoj Chen, Ming Shanghai Ocean Univ Coll Informat Technol Shanghai 200090 Peoples R China

ISBN: (纸本)9781424421077

Recent years have seen the emergence of wireless sensor network systems that must support the real time query with the high data rate. sensor top K query plays a critical role for energy efficient of wireless sensor system. In this paper we present the Filter based Top query monitoring system, which is an efficient and dynamic TOP query processing algorithm for distributed sensor networks. the objective of a top-k query is to find the k highest ranked answers/set to a user defined similarity function. the evaluation of such a query in a sensor network environment is allied with the transfer of data over an extremely expensive communication medium. Our propose system helps in order to minimize the number of tuples that have to be transferred towards the sink node. Furthermore, this system resolves queries in the network rather than in a centralized fashion, which minimizes even more the consumption of bandwidth and delay increasing the network life time and making the system energy efficient one.

关键词： wireless sensor network continuous K-query sets efficient energy dynamic filter system

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Compromised sensor nodes detection: A quantitative approach

Compromised sensor nodes detection: A quantitative approach

引用

28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Li, Tao Song, Min Alam, Mansoor EECS Department University of Toledo Toledo OH 43606 United States ECE Department Old Dominion University Norfolk VA 23529 United States

ISBN: (纸本)9780769531731

In a wireless sensor network, an adversary may crack legal nodes or deploy malicious nodes to launch various attacks. these nodes are collectively called compromised nodes. In this paper, we define a Data Transmission Quality (DTQ) function to differentiate the legitimate nodes and compromised nodes. the DTQ function is defined in a way that it will keep close to constant or change smoothly for legitimate nodes and will keep decreasing for suspicious nodes. the final decision of whether or not a suspicious node is compromised is determined by a group voting procedure. Simulations were conducted to verify the effectiveness of the design. © 2008 ieee.

关键词： sensor nodes

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Why is IPSec a viable option for Wireless sensor Networks

Why is IPSec a viable option for Wireless Sensor Networks

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5th ieee international conference on Mobile Ad-Hoc and sensor systems

作者： Granjal, Jorge Silva, Ricardo Monteiro, Edmundo Silva, Jorge Sa Boavida, Fernando Univ Coimbra P-3000 Coimbra Portugal

ISBN: (纸本)9781424425747

Many issues still remain to be addressed in order to achieve acceptable security in Wireless sensor Networks (WSNs). this necessity, together with the adoption of IPv6 on WSNs being defined at the 6lowpan working group of the IETF, motivates our investigation on the feasibility of the application of IPSec on sensor nodes. IPSec is already part of IPv6, which makes it a natural candidate to be directly employed or adapted for WSNs. We discuss results obtained from practical experiments on the usage of cryptographic algorithms typically employed within IPSec in real sensor nodes. We analyze the security and performance tradeoffs involved when employing cryptography measures in WSNs, also in the context of their usage side-by-side with IPv6. the results obtained show that the adoption of a security architecture such as IPSec is viable, and also point towards the successful design and deployment of a security architecture for WSNs.

关键词： wireless sensor networks security IPSec 6lowpan

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Detecting Sybil Attacks in Wireless and sensor Networks Using Cluster Analysis

Detecting Sybil Attacks in Wireless and Sensor Networks Usin...

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5th ieee international conference on Mobile Ad-Hoc and sensor systems

作者： Yang, Jie Chen, Yingying Trappe, Wade Stevens Inst Technol Dept ECE Hoboken NJ 07030 USA Rutgers State Univ WINLAB Piscataway NJ 08854 USA

ISBN: (纸本)9781424425747

Wireless networks are vulnerable to sybil attacks, in which a sybil node forges multiple identifications to trick the system and conduct harmful attacks. the traditional approach to address sybil attacks is to employ cryptographic-related methods. However, conventional security approaches may not always desirable due to their infrastructural overhead. In this paper, we propose to utilize K-means cluster analysis for detecting sybil attacks based on the spatial correlation between the signal strength and physical locations. Our approach requires minimal overhead to wireless devices. We have evaluated our methods through experimentation using both an 802.11 (WiFi) network as well as an 802.15.4 (ZigBee) network in two office buildings. Our results show that the proposed sybil attack detector is highly effective with over 95% detection rates and under 5% false positive rates.

关键词： Office buildings

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Fault-Tolerant Event Region Detection in Wireless sensor Networks Using Statistical Hypothesis Test

Fault-Tolerant Event Region Detection in Wireless Sensor Net...

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5th ieee international conference on Mobile Ad-Hoc and sensor systems

作者： Cao, Donglei Jin, Beihong Cao, Jiannong Chinese Acad Sci Grad Univ Beijing 100864 Peoples R China Chinese Acad Sci Inst Software Beijing 100864 Peoples R China Hong Kong Polytecn Univ Dept Comput Hong Kong Peoples R China

ISBN: (纸本)9781424425747

Most existing algorithms for fault-tolerant event region detection only assume that events are spatially correlated, but we argue that events are usually both spatially and temporally correlated. By examining the temporal correlation of sensor measurements, we propose a detection algorithm by applying statistical hypothesis test (SHT). SHT-based algorithm is more accurate in detecting event regions, and is more energy efficient since it avoids measurement exchanges. To improve the capability of fault recognition, we extend SHT-based algorithm by examining both spatial and temporal correlations of sensor measurements. the extended SHT-based algorithm can recognize almost all faults when sensor network is densely deployed.

关键词： Statistical tests

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