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NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： Michael Beck University of Kaiserslautern Germany Distributed Computer Systems Lab (DISCO)

ISBN: (纸本)9781467389921

Current analysis methods for queueing systems mostly aim at steady-state results. However, many applications demand results for systems with a transient behavior. In communication networks such transient phases arise from sleep scheduling or the slow-start phase of TCP. In both examples the service offered is separated into a transient and a steady-state phase. In a larger context also the arrivals to a queueing system can show transient behavior. The demand or availability of energy in smart grids, the pool of data generated after the map phase in big data applications, or the arrivals in public transportation networks are a few examples. Analyzing these kind of systems in a steady-state fashion (for example via queueing theory) ignores their behavior in the transient phases. On the other side the analysis of transient phases bears additional challenges. This paper uses stochastic network calculus to describe the non-stationary behavior of queueing systems. With the help of bivariate arrival- and service envelopes time-variant performance bounds are constructed. Two numerical examples exemplify the framework created by these envelopes and compare it to the time-invariant analysis.

关键词： Transient analysis Queueing analysis Steady-state Calculus Stochastic processes Delays Mathematical model

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CRC2: A Mediator Based Approach for Cloud Robotics

CRC2: A Mediator Based Approach for Cloud Robotics

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IEEE World Congress on Services (SERVICES)

作者： Saima Noreen Ehtesham Zahoor Secure Networks and Distributed Systems Lab (SENDS) National University of Computer and Emerging Sciences Islamabad Pakistan

Cloud robotics is a field of robotics which enables robots to benefit from the powerful computational, storage, and communication resources provided by the Cloud. This allows for smart and low-cost robots having brain in the Cloud. However, network latency and too much reliance on the Cloud could lead to a brainless robot. The need for a mediator is thus evident to coordinate the communication. In this paper, we propose a multi-process mediator framework for Cloud robotics, named CRC2. The proposed framework makes use of the smartphone resources and offers a service-based approach to establish and manage a collaborative communication channel between robot and the Cloud. The proposed framework is lightweight and is focused to minimize communication latency. In addition, it automates robotic tasks execution and provides smartphone resources integration.

关键词： Robot kinematics computer architecture Robot sensing systems Cloud computing Servers Clouds

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Respiration monitoring using a wireless network with space and frequency diversities

Respiration monitoring using a wireless network with space a...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Yang Zhao Jeff Ashe Ting Yu Distributed Intelligent Systems Lab GE Global Research Niskayuna Biomedical and Electronic Systems Lab GE Global Research Niskayuna NY Computer Vision Lab GE Global Research Niskayuna NY

Non-invasive respiration monitoring of a person has many human-centric applications. In this paper, we use received signal strength indicator (RSSI) from a wireless network to perform non-contact respiration rate monitoring. We develop a low-cost monitoring system that uses multiple commercial-off-the-shelf (COTS) radios operating on multiple frequency channels. We propose a maximum likelihood estimator (MLE) to estimate respiration rate from RSSI on multiple links and multiple channels. Our experimental results show that the system is more robust to user orientations and postures. The system is over 40% more accurate than previous systems for eight human subject experiments.

关键词： Monitoring Maximum likelihood estimation Wireless sensor networks Wireless networks Robustness Time series analysis

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Solution of Traveling Salesman Problem with Hotel Selection in the framework of MILP-tropical optimization

Solution of Traveling Salesman Problem with Hotel Selection ...

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American Control Conference

作者： Mohammadreza Radmanesh Manish Kumar Alireza Nemati Mohammad Sarim Cooperative Distributed Systems Lab. Department of Mechanical and Materials Engineering University of Cincinnati Ohio 45221 USA Department of Mechanical and Materials Engineering University of Cincinnati Ohio 45221 USA Cooperative Distributed Systems Lab. Department of Electrical Engineering and Computer Science University of Cincinnati Ohio 45221 USA

ISBN: (纸本)9781467386838

In this paper, Traveling Salesman Problem with Hotel Selection (TSPHS), an extension of the Traveling Salesman Problem (TSP) has been considered. A mathematical formulation has been presented in the framework of Mixed Integer Linear Programming (MILP). Subsequently, the problem has been formulated in the novel framework of tropical mathematics and a strategy to obtain exact solution has been proposed. The performance of the proposed solution, in terms of the optimality and computational time requirement, has been compared with the solution strategies available in literature including traditional MILP. The results indicate that the proposed solution strategy not only leads to optimal results but also is computationally much more efficient.

关键词： Traveling salesman problems Linear programming Optimization Urban areas Vehicles Routing

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Special issue on cloud computing for scientific and business needs

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CSI Transactions on ICT 2017年第4期5卷 339-339页

作者： Arun Agarwal Rajkumar Buyya School of Computer and Information Sciences University of Hyderabad Hyderabad India Cloud Computing and Distributed Systems Lab The University of Melbourne Melbourne Australia Manjrasoft Pvt. Ltd. Melbourne Australia

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Boosting sensor network calculus by thoroughly bounding cross-traffic

Boosting sensor network calculus by thoroughly bounding cros...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Steffen Bondorf Jens B. Schmitt Distributed Computer Systems (DISCO) Lab University of Kaiserslautern Germany

Sensor Network Calculus (SensorNC) provides a framework for worst-case analysis of wireless sensor networks. The analysis proceeds in two steps: For a given flow, (1) the network is reduced to a tandem of nodes by computing the arrival bounds of cross-traffic; (2) the flow is separated from the cross-traffic by subtracting cross-flows and concatenating nodes on its path. While the second step has seen much treatment, the first step has not at all. This is in sharp contrast to the fact that arrival bounding takes roughly 80% of the total analysis time and is equally crucial for the tightness of the bounds. Therefore, we turn our attention to this first SensorNC analysis step with the goal to boost the performance and applicability of the overall framework. The main technical contribution is a generalized version of the concatenation theorem within the SensorNC setting. This generalization is instrumental in simplifying and streamlining the cross-traffic arrival bound computations such that run times can be reduced by more than a factor of 5. Even more important, it enables a localization of the information necessary to execute the calculations at the node level, thus enabling a distribution of the SensorNC analysis within a self-modeling WSN.

关键词： Calculus Servers Delays Aggregates Wireless sensor networks Topology computers

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Semantic self-management and mediation for home service platforms 44

Semantic self-management and mediation for home service plat...

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44. Jahrestagung der Gesellschaft fur Informatik INFORMATIK 2014 - Big Data - Komplexitat meistern - Big Data - Mastering Complexity: 44th Annual Meeting of the Society for computer Science, INFORMATICS 2014

作者： Schaefer, Jan RheinMain University of Applied Sciences Design Computer Science Media Department Distributed Systems Lab. Unter den Eichen 5 WiesbadenD-65195 Germany

ISBN: (纸本)9783885796268

Service-oriented computing has long outgrown the enterprise. Today, personal livingenvironments feature an increasing number of convenience-, health-and securityrelatedapplications provided by distributed interacting devices and services (oftencalled smart homes), which do not only support users but require management taskssuch as application installation, configuration and continuous maintenance. Thesetasks are becoming complex and error-prone. One way to escape this situation is toenable service platforms to configure and manage themselves. The approach presentedhere extends services with semantic descriptions to enable platform-independent autonomousservice level management and mediation using model driven architectureand autonomic computing concepts. It has been implemented as a semantic autonomicmanager, whose concept, prototypical implementation and evaluation are presented.

关键词： Smart homes

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Towards a Statistical Network Calculus-Dealing with Uncertainty in Arrivals

Towards a Statistical Network Calculus-Dealing with Uncertai...

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IEEE International Conference on computer Communications

作者： Michael A. Beck Sebastian A. Henningsen Simon B. Birnbach Jens B. Schmitt Distributed Computer Systems (DISCO) Lab University of Kaiserslautern Germany

The stochastic network calculus (SNC) has become an attractive methodology to derive probabilistic performance bounds. So far the SNC is based on (tacitly assumed) exact probabilistic assumptions about the arrival processes. Yet, in practice, these are only true approximately-at best. In many situations it is hard, if possible at all, to make such assumptions a priori. A more practical approach would be to base the SNC operations on measurements of the arrival processes (preferably even on-line). In this paper, we develop this idea and incorporate measurements into the framework of SNC taking the further uncertainty resulting from estimation errors into account. This is a crucial step towards a statistical network calculus (StatNC) eventually lending itself to a self-modelling operation of networks with a minimum of a priori assumptions. In numerical experiments, we are able to substantiate the novel opportunities by StatNC.

关键词： Calculus Probabilistic logic Uncertainty computers Stochastic processes Conferences Random variables

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A semantic self-management approach for service platforms

A semantic self-management approach for service platforms

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IEEE Symposium on Network Operations and Management

作者： Jan Schaefer Design Computer Science Media Department Distributed Systems Lab

Future personal living environments feature an increasing number of convenience-, health- and security-related applications provided by distributed services, which do not only support users but require tasks such as installation, configuration and continuous administration. These tasks are becoming tiresome, complex and error-prone. One way to escape this situation is to enable service platforms to configure and manage themselves. The approach presented here extends services with semantic descriptions to enable platform-independent autonomous service level management using model driven architecture and autonomic computing concepts. It has been implemented as a OSGi-based semantic autonomic manager, whose concept, prototypical implementation and evaluation are presented.

关键词： Quality of service Semantics Ontologies Monitoring Grounding Computational modeling Knowledge based systems

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Inside risks: Keys under doormats

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Communications of the ACM 2015年第10期58卷 24-26页

作者： Abelson, Harold Anderson, Ross Bellovin, Steven M. Benaloh, Josh Blaze, Matt Diffie, Whitfield Gilmore, John Green, Matthew Landau, Susan Neumann, Peter G. Rivest, Ronald L. Schiller, Jeffrey I. Schneier, Bruce Specter, Michael A. Weitzner, Daniel J. MIT Creative Commons Free Software Foundation United States University of Cambridge United Kingdom Computer Science Columbia University United States Microsoft Research United States University of Pennsylvania Distributed Systems Lab. United States Internet-Scale Communications United States Sun Microsystems Cygnus Solutions Electronic Frontier Foundation Cypherpunks Internet's alt newsgroups United States Johns Hopkins University Information Security Institute United States Worcester Polytechnic Institute United States Computer Science Lab SRI International ACM Risks Forum United States MIT Institute RSA Security and Verisign United States Internet Engineering Steering Group United States Berkman Center for Internet and Society Harvard Law School Resilient Systems Inc United States MIT Computer Science and Artificial Intelligence Lab MIT Cybersecurity and Internet Policy Research Initiative United States

The complexity of today's Internet environment means new law enforcement requirements are likely to introduce unanticipated security flaws. Political and law enforcement leaders in the U.S. and the U.K. have called for Internet systems to be redesigned to ensure government access to information even encrypted information. There are three general problems. First, providing exceptional access to communications would force a U-turn from the best practices now being deployed to make the Internet more secure. These practices include forward secrecy, where decryption keys are deleted immediately after use, so that stealing the encryption key used by a communications server would not compromise earlier or later communications. Second, building in exceptional access would substantially increase system complexity. Third, exceptional access would create concentrated targets that could attract bad actors. Moreover, law enforcement's stated need for rapid access to data would make it impractical to store keys offline or split keys among multiple key holders, as security engineers would normally do with extremely high-value credentials.

关键词： Law enforcement

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