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IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

作者： Steffen Moser Jochen Weiß Frank Slomka Institute of Embedded Systems/Real-Time Systems Faculty of Engineering and Computer Science Ulm University Ulm Germany

By giving vehicles the ability to propagate warning messages to the other ones, the number and the severity of accidents on our streets could likely be reduced. Safety-related applications based on vehicular ad-hoc neworks (VANET) are usually dependent on transmitting a message from source to sink within a given time limit. IEEE proposes the standard 802.11p which is an adaption of the well-known Wireless LAN 802.11a for inter-vehicle communication. While many properties have been improved, 802.11p still comes with a contention-based medium access control, only. This leads to an indeterminism and data-dependencies. One deterministic and fairer alternative compared to contention based medium access mechanism would be Time-Divison Multiple Access (TDMA). As a VANET is typically fully self-organizing, the time slots must be assigned autonomously by the nodes of the distributed system. This, however, leads to drawbacks in the performance of the protoctol which are analyzed in this paper.

关键词： Vehicles Ad hoc networks Time division multiple access Real time systems Media Access Protocol Communication channels

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An approach for the integration of smart antennas in the design and simulation of vehicular ad-hoc networks

An approach for the integration of smart antennas in the des...

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International Conference on Future Generation Communication Technology (FGCT)

作者： Steffen Moser Simon Eckert Frank Slomka Institute of Embedded Systems/Real-Time Systems Faculty of Engineering and Computer Science Ulm University Ulm Germany

The radio channel is a limiting resource in vehicular ad-hoc networks. A lot of possible applications in the field of vehicle-to-vehicle and vehicle-to-infrastructure communication will make use of sending messages to destination nodes addressed by geographical coordinates. Beam forming, which is the transmission of a message's signal explicitly into a specific spatial area by exploiting a phase-delayed array of antennas, can be seen as an approach to reduce the overall channel load in vehicular ad-hoc networks. Due to the implementation of today's network simulators, the analysis of the advantages and possible drawbacks of beam forming on vehicular ad-hoc network scenarios is hardly possible. In this paper we show a way in which a simulation framework typically used for research on vehicular ad-hoc networks can be extended by a realistic channel simulation and a physical layer simulation which allows studying the beam forming abilities of a smart antenna system.

关键词： Vehicular ad hoc networks Dipole antennas Arrays Antenna arrays Vehicles Routing

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Detection and Defense Strategies against Attacks on an Artificial Hormone System Running on a Mixed Signal Chip

Detection and Defense Strategies against Attacks on an Artif...

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International Symposium on Object-Oriented Real-Time distributed Computing

作者： Christoph Leineweber Mathias Pacher Benjamin Betting Julius von Rosen Uwe Brinkschulte Lars Hedrich Embedded Systems Institute for Computer Science J.W. Goe University Frankfurt am Main Germany Embedded Systems Institute for Computer Science Johann Wolfgang Goethe University Frankfurt Frankfurt am Main Germany

The Artificial Hormone System (AHS) is a self organizing system which allocates tasks to processing elements. It works in a distributed way, is able to hold real-time conditions and can run in a mixed-signal chip environment significantly increasing system reliability. Yet the hormone mechanisms offer new ways for malicious attacks which can affect the correct functioning of the AHS. Such attacks may cause severe damage if the AHS is used in an embedded (maybe real-time) environment. Therefore, this paper deals with analyzing malicious attacks on the AHS. We present several ways of attacking the AHS and resulting detection and defense strategies. We also evaluate these strategies in the paper and demonstrate that they can help to protect the AHS from attacks.

关键词： Biochemistry Resource management Silicon Real time systems Upper bound Program processors

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Profiling energy consumption of Wireless Sensor Nodes with almost zero effort

Profiling energy consumption of Wireless Sensor Nodes with a...

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IEEE International Conference on Communications

作者： Oliver Hahm Stephan Adler Institute of Computer Science Distributed Embedded Systems Freie Universitat Berlin

ISBN: (纸本)9781457720529

We present a technique to profile the energy consumption of real Wireless Sensor Network (WSN) applications. The introduced method is highly integrated into the system and allows the developer of WSN algorithms to analyze the power consumption almost without any additional effort. It can break the power consumption down to any desired level from function-based or thread-based analysis to the evaluation of functional blocks. The required measuring setup relies on a simple circuit using an instrumentation amplifier and a shunt. Energy profiling uses features of the GNU Compiler Collection and benefits from the multi-threading operating system μkleos written in pure C code. Compared to similar approaches in this field the energy profiler does not require any modifications to device drivers or application code. Due to this easily deployable method it is feasible to examine the demand for energy for every single node in the network.

关键词： Wireless sensor networks Energy consumption Energy measurement Hardware Instruments Operating systems Power demand

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Monitoring performance-related QoS properties in service-oriented systems: A pattern-based architectural decision model

Monitoring performance-related QoS properties in service-ori...

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16th European Conference on Pattern Languages of Programs, EuroPLoP 2011

作者： Oberortner, Ernst Sobernig, Stefan Zdun, Uwe Dustdar, Schahram Distributed Systems Group Information Systems Institute Vienna University of Technology Argentinierstrasse 8/184-1 A-1040 Vienna Austria UZA II Augasse 2-6 A-1090 Vienna Austria Software Architecture Faculty of Computer Science Vienna University Waehringerstrae 29 A-1090 Vienna Austria

ISBN: (纸本)9781450313025

In service-oriented systems, service-level agreements (SLA) are specified as contracts between service providers and service consumers. SLAs stipulate - among other things - the provided services' performance. A service provider must fulfill the agreements stated in SLAs, e.g., to avoid paying penalties. Service consumers must verify whether the service quality as purchased is delivered. We present an architectural design decision model (ADDM) covering the design of a QoS monitoring infrastructure. The ADDM collects design decisions about measuring, storing, and evaluating performance-related quality-of-service (QoS) agreements. The model includes various requirements and puts forth design solutions by referring to established architectural, remoting, and design patterns. We evaluate the ADDM to build the architecture of a QoS monitoring infrastructure in a case study. The model guides through the decision-making process of designing a QoS monitoring infrastructure. © 2011 ACM.

关键词： Quality of service

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System Dependability Modelling and Analysis Using AADL and HiP-HOPS

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IFAC Proceedings Volumes 2012年第6期45卷 1647-1652页

作者： Zhibao Mian Leonardo Bottaci Yiannis Papadopoulos Matthias Biehl Computer Science Department University of Hull HU6 7RX UK Embedded Control Systems Royal Institute of Technology (KTH) Sweden

The Architecture Analysis and Design Language (AADL) is gaining widespread acceptance in aerospace, automobile and avionics industries for designing dependability-critical systems. The design process of dependable systems must address both cost and dependability (safety, reliability, availability, maintainability) concerns. This requires translating concepts of the design domain to the dependability analysis domain. We automate such a translation between AADL and the dependability analysis tool HiP-HOPS by using model transformation techniques. A generic primary-standby example system is used to show the mechanics of the transformation and the potential for highlighting problems and assisting design work using this technology.

关键词： Dependability modeling Dependability Analysis AADL HiP-HOPS Model transformation

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Generating formal system models from natural language descriptions

Generating formal system models from natural language descri...

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IEEE International High-Level Design Validation and Test Workshop

作者： Rolf Drechsler Ian G. Harris Robert Wille TCyber-Physical Systems DFKI GmbH Bremen Germany Institute of Computer Science University of Bremen Bremen Germany Center for Embedded Computer Systems University of California Irvine USA

The initial starting point of each design process usually is given by means of a textual specification provided in a natural language. However, the process of creating an accurate and complete formal representation has always been a bottleneck in the design. Manually generating such a formal description from the specification is expensive, requires significant time, and a large number of well-trained design and verification engineers. Usually, only humans with expert design knowledge are assumed to have the ability to properly interpret the respective specification documents.

关键词： Unified modeling language Semantics Receivers Design automation Natural language processing Solid modeling

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A novel indirect trust based link state routing scheme using a robust route trust method for wireless sensor networks

A novel indirect trust based link state routing scheme using...

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2012 5th International Conference on New Technologies, Mobility and Security, NTMS 2012

作者： Raha, Arnab Naskar, Mrinal Kanti Chakraborty, Arpita Alfandi, Omar Hogrefe, Dieter Department of Electronics and Telecommunication Engineering Advanced Digital and Embedded Systems Laboratory Jadavpur University Kolkata India Electronics and Communication Engineering Techno India West Bengal University of Technology India Institute of Computer Science Telematics Group Georg-August-Universitaet Goettingen Goettingen Germany

ISBN: (纸本)9781467302296

Integration of trust in routing mechanisms already prevalent in Wireless Sensor Networks (WSN) has become an interesting research area of late. Several methods exist for the assignment of trust to the nodes present in a WSN. However the real challenge lies in proper integration of this trust to an existing routing protocol for the synthesis of a trust-aware routing algorithm. In this paper we try to take the help of Geometrical Mean based indirect trust evaluation mechanism for calculation of trust of individual nodes and thereby use the calculated trusts for determination of the different route trusts (RTs). We present a link state routing protocol based only on these indirect trusts which forms the routes and finds the best trustworthy route among them by comparing the values of all the calculated route trusts as for each route present in the network. We have developed three algorithms related to this and have shown their merits. Finally, we compare our work with similar trust integrated routing protocols and show its advantages over them. © 2012 IEEE.

关键词： Base stations

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Keynote: OpenSense: Open sensor networks for air quality monitoring

Keynote: OpenSense: Open sensor networks for air quality mon...

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IEEE Annual Conference on Pervasive Computing and Communications Workshops (PerCom)

作者： Karl Aberer Distributed Information Systems Laboratory (LSIR) Institute for Core Computing Science (IIF) School for Computer and Communication Science (IC) EPF Lausanne Lausanne Switzerland

Wireless sensor networks and publishing of sensor data on the Internet bear the potential to substantially increase public awareness and involvement in environmental sustainability. Air pollution monitoring in urban areas is a prime example of such an application as common air pollutants have direct effect on the human health. However, bringing the vision of public involvement in environmental monitoring to a reality poses today substantial technical challenges for the communication and information systems infrastructure, to scale up from isolated well controlled systems to an open and scalable infrastructure. In this talk we provide first an overview of the OpenSense project for air pollution monitoring. OpenSense takes a holistic, end-to-end systems perspective. The crucial insight is that in designing open scalable sensing system one has to consider dependencies among many system dimensions both for modelling and control, including sensor behaviour, wireless networks, mobility, environmental models, user needs as well as trust and privacy concerns. In the second part of the talk we will discuss in more detail aspects of sensor data processing relevant to the OpenSense project. We will introduce model-based methods for sensor data cleaning, segmentation and multi-query processing. We will show a framework to extract semantic activity information from trajectory data and finally provide some initial results on studying the tradeoffs between privacy and sensor data accuracy in community sensing settings. Finally we will provide an outlook on some of our next steps we plan to undertake within OpenSense towards realizing a community-based approach for addressing health concerns of urban populations.

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Automating the Management and Versioning of Service Models at Runtime to Support Service Monitoring

Automating the Management and Versioning of Service Models a...

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International Conference on Enterprise distributed Object Computing (EDOC)

作者： Taid Holmes Uwe Zdun Schahram Dustdar Distributed Systems Group Institute of Information Systems University of Technology Vienna Austria Software Architecture Group Faculty of Computer Science University of Technology Vienna Austria

In a model-driven service-oriented architecture (SOA), the services are in large parts generated from models. To facilitate monitoring, governance, and self-adaptation the information in these models can be used by services that monitor, manage, or adapt the SOA at runtime. If a service for monitoring, management, or adaptation in an SOA is dependent on models, and the metamodel changes, usually the service needs to be manually adapted to work with the new version, recompiled, and redeployed. This manual effort impedes the use of models at runtime. To address this problem, this paper introduces model-aware services that work with models at runtime. These services are supported using a service environment, called Morse. Hiding the complexity of implicit versioning of models from users while respecting the principle of Universally Unique Identifiers (UUIDs), it realizes a novel transparent UUID-based model versioning technique. It uses the model-driven approach to automatically generate and deploy Morse services that are used by the model-aware services to access models in the correct version. In this way, monitoring and adaptation in SOAs can be better supported, and the manual effort to evolve services for monitoring, management, or adaptation, which are based on models at runtime, can be minimized.

关键词： Biological system modeling Adaptation models Unified modeling language Monitoring Runtime Service oriented architecture Manuals

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