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检索条件"机构=Computer Engineering and Networks Laboratory"

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Planipes: Mobile foot pressure analysis

Planipes: Mobile foot pressure analysis

引用

1st ACM Workshop on Mobile Systems, Applications, and Services for Healthcare, mHealthSys 2011, Co-held with ACM SenSys 2011

作者： Pfaffen, Samuel Sommer, Philipp Stocker, Christian Wattenhofer, Roger Welten, Samuel Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781450306843

Analyzing foot pressure is helpful in clinical diagnosis. Possible applications include the diagnosis of back injuries, prevention of diabetic foot ulceration, and adaptation of insoles for orthopedic applications. Consequently, several approaches to measure foot pressure distributions exist. However, traditional systems exhibit one common drawback: They are non-mobile or at least obtrusive and therewith influence the measurement. In the case of stationary pressure plates, people are only able to measure the foot pressure distribution in an unnatural context. The few available portable systems feature a lot of cables and large data processing computers, which render them unusable for everyday activities or long term measurements. To address these issues we have implemented Planipes, a mobile and versatile foot pressure measurement platform. It consists of a small sensor module that measures foot pressure distribution in real time and a smartphone application that allows to visualize, record, and analyze the data. Both parts are wirelessly connected through Bluetooth. Our system allows to unobtrusively measure foot pressure in real time during everyday activities, and to give feedback to the user. In contrast to existing systems it allows to measure foot pressure of a person over a longer period and in a natural environment, without influencing or impeding the user. Copyright 2011 ACM.

关键词： Wearable sensors

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The risk-utility tradeoff for ip address truncation

The risk-utility tradeoff for ip address truncation

引用

1st ACM Workshop on Network Data Anonymization, NDA'08, Co-located with the 15th ACM computer and Communications Security Conference, CCS'08

作者： Burkhart, Martin Brauckhoff, Daniela May, Martin Boschi, Elisa Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781605583013

Network operators are reluctant to share traffic data due to security and privacy concerns. Consequently, there is a lack of publicly available traces for validating and generalizing the latest results in network and security research. Anony- mization is a possible solution in this context;however, it is unclear how the sanitization of data preserves characteris- tics important for traffic analysis. In addition, the privacy- preserving property of state-of-the-art IP address anonymi- zation techniques has come into question by recent attacks that successfully identified a large number of hosts in ano- nymized traces. In this paper, we examine the tradeoff between data utility for anomaly detection and the risk of host identification for IP address truncation. Specifically, we analyze three weeks of unsampled and non-anonymized network traces from a medium-sized backbone network to assess data utility. The risk of de-anonymizing individual IP addresses is formally evaluated, using a metric based on conditional entropy. Our results indicate that truncation effectively prevents host identification but degrades the utility of data for anomaly detection. However, the degree of degradation de- pends on the metric used and whether network-internal or external addresses are considered. Entropy metrics are more resistant to truncation than unique counts and the detec- tion quality of anomalies degrades much faster in internal addresses than in external addresses. In particular, the use- fulness of internal address counts is lost even for truncation of only 4 bits whereas utility of external address entropy is virtually unchanged even for truncation of 20 bits.

关键词： Entropy

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Complexity of scheduling with analog network coding

Complexity of scheduling with analog network coding

引用

1st ACM International Workshop on Foundations of Wireless Ad Hoc and Sensor Networking and Computing 2008, FOWANC'08

作者： Goussevskaia, Olga Wattenhofer, Roger Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781605581491

In this paper we analyze the complexity of scheduling wireless links in the physical interference model with analog network coding capability. We study two models with different definitions of network coding. In one model, we assume that a receiver is able to decode several signals simultaneously, provided that these signals differ in strength significantly. In the second model, we assume that routers are able to forward the interfering signal of a pair of nodes that wish to exchange a message, and nodes are able to decode the "collided" message by subtracting their own contribution from the interfered signal. For each network coding definition, we construct an instance of the scheduling problem in the geometric SINR model, in which nodes are distributed in the Euclidean plane. We present NP-completeness proofs for both scenarios. Copyright 2008 ACM.

关键词： Decoding

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Randomized 3D geographic routing

Randomized 3D geographic routing

引用

INFOCOM 2008: 27th IEEE Communications Society Conference on computer Communications

作者： Flury, Roland Wattenhofer, Roger Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781424420261

We reconsider the problem of geographic routing in wireless ad hoc networks. We are interested in local, memoryless routing algorithms, i.e. each network node bases its routing decision solely on its local view of the network, nodes do not store any message state, and the message itself can only carry information about 0(1) nodes. In geographic routing schemes, each network node is assumed to know the coordinates of itself and all adjacent nodes, and each message carries the coordinates of its target. Whereas many of the aspects of geographic routing have already been solved for 2D networks, little is known about higher-dimensional networks. It has been shown only recently that there is in fact no local memoryless routing algorithm for 3D networks that delivers messages deterministically. In this paper, we show that a cubic routing stretch constitutes a lower bound for any local memoryless routing algorithm, and propose and analyze several randomized geographic routing algorithms which work well for 3D network topologies. For unit ball graphs, we present a technique to locally capture the surface of holes in the network, which leads to 3D routing algorithms similar to the greedy-face-greedy approach for 2D networks. © 2008 IEEE.

关键词： Network routing

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Exploiting protocol models for generating feasible communication stack configurations

Exploiting protocol models for generating feasible communica...

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9th ACM/IEEE International Conference on Information Processing in Sensor networks, IPSN 2010

作者： Zimmerling, Marco Ferrari, Federico Woehrle, Matthias Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781605589886

Communication stacks are composed of distinct layers that, in principle, operate independently and interact through well-defined interfaces. However, resource constraints in sensor networks typically necessitate optimizations, leading to implicit assumptions and dependencies among layers (e.g., a collection protocol assumes the MAC protocol provides sufficient bandwidth). These dependencies are often tracked manually, yet become extremely complex as protocols evolve and requirements change. We propose to model assumptions and dependencies explicitly, as constraints on protocol parameters. This allows for using standard tools to generate feasible protocol configurations. We demonstrate the effectiveness of our approach using the example of FTSP running on top of a low-power listening MAC protocol. © 2010 Copyright is held by the author/owner(s).

关键词： Sensor networks

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Visualizing host traffic through graphs 10

Visualizing host traffic through graphs

引用

Proceedings of the Seventh International Symposium on Visualization for Cyber Security

作者： Glatz, Eduard Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781450300131

Gaining an overview of host activities is hard when a host is busily exchanging hundreds or thousands of flows over a network. This makes investigating traffic of a suspicious host a tedious task for a security analyst. We propose a novel host traffic visualization technique that reduces this cognitive burden by i) representing traffic through an annotated k-partite graph reflecting familiar Berkeley socket model semantics, ii) employing a host role summarization for effective removal of ephemeral traffic features, and iii) providing classification and filtering techniques for unwanted traffic, which are important for identifying the functional role of port numbers and for visualization. We present the open-source tool HAPviewer and demonstrate how it can visualize a large number of flows through a compact and easily interpretable graph. © 2010 ACM.

关键词： Visualization

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Analytic real-time analysis and timed automata: A hybrid method for analyzing embedded real-time systems

Analytic real-time analysis and timed automata: A hybrid met...

引用

Embedded Systems Week 2009, ESWEEK 2009 - 7th ACM International Conference on Embedded Software, EMSOFT '09

作者： Lampka, Kai Perathoner, Simon Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781605586274

This paper advocates a strict compositional and hybrid approach for obtaining key (performance) metrics of embedded systems. At its core the developed methodology abstracts system components by either flow-oriented and purely analytic descriptions or by state-based models in the form of timed automata. The interaction among the heterogeneous components is modeled by streams of discrete activity-triggers. In total this yields a hybrid framework for the compositional analysis of embedded systems. It supplements contemporary techniques for the following reasons: (a) state space explosion as intrinsic to formal verification is limited to the level of isolated components;(b) computed performance metrics such as buffer sizes, delays and utilization rates are not overly pessimistic, because coarse-grained purely analytic models are used for components only which conform to the stateless model of computation. For demonstrating the usefulness of the presented ideas we implemented a corresponding tool-chain and investigated the performance of a two-staged computing system, where one stage exhibits state-dependent behavior only coarsely coverable by a purely analytic and stateless component abstraction. Copyright 2009 ACM.

关键词： Embedded systems

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A personal touch - Recognizing users based on touch screen behavior

A personal touch - Recognizing users based on touch screen b...

引用

3rd International Workshop on Sensing Applications on Mobile Phones, PhoneSense 2012 - In Conjunction with ACM SenSys 2012

作者： Kolly, Sarah Martina Wattenhofer, Roger Welten, Samuel Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781450317788

The spread of touch screen based smart phones has been constantly increasing over the last few years. However, there are still many open research questions concerning the basic input properties of these devices. We performed a large scale study to research the users' touch screen behavior on standard UI elements. To do so we programmed and published a quiz game that logs touch data and sends it back for evaluation purposes. Over 14,000 persons have played this game so far and sent back statistical data. We use the collected data to present basic touch properties, such as mean hold time and pressure dynamics, and to show that touch screen based input is individual for each person and that one can identify a specific user in a set of 5 users with a precision of about 80%, based on just a few touch events. © 2012 ACM.

关键词： Touch screens

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Towards connecting base stations over metro gigabit ethernets 06

Towards connecting base stations over metro gigabit ethernet...

引用

3rd International Conference on Quality of Service in Heterogeneous Wired/Wireless networks

作者： Baumann, Rainer Fiedler, Ulrich Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)1595935371

Deployment of Gigabit Ethernets in metropolitan areas creates new opportunities to save costs by converging data and telephone services. The primary question of our study is whether emerging metropolitan networks can meet the QoS requirements necessary to connect GSM and UMTS base stations. These requirements on delay, jitter, and loss are significantly more stringent than the ones for VoIP and have to be met at the presence of bursty cross traffic. Therefore, we have probed ETH's campus network which spans the metropolitan area of Zurich with traffic comparable to encapsulated E1 traffic from base stations and have measured perceived QoS. Our findings show that the campus network generally meets the QoS requirements. However, the perceived QoS degrades with increasing network *** further investigate the impact of the configuration of Ethernet switches on perceived QoS, we have conducted a simulation study. The results show that the perceived QoS is better when switch buffers are limited to small sizes of 1 MB compared to setups where the number of frames in the buffer is limited. From these results we infer that metropolitan Gigabit Ethernets are well suited for connecting GSM and UMTS base stations. © 2006 ACM.

关键词： Base stations

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BLITZ: A network architecture for low latency and energy-efficient event-triggered wireless communication 4

BLITZ: A network architecture for low latency and energy-eff...

引用

4th ACM Workshop on Hot Topics in Wireless, HotWireless 2017

作者： Sutton, Felix Da Forno, Reto Beutel, Jan Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781450351409

We consider wireless sensing systems where an event must be rapidly communicated from its source to a remote host. Due to the non-deterministic nature of event arrivals, multi-hop dissemination using state-of-the-art radio duty-cycled protocols leads to a trade-off between latency and energy efficiency. In order to circumvent this system design constraint, we propose BLITZ, a network architecture that leverages interference-based flooding to rapidly wake-up the multi-hop network and disseminate the event on-demand. We show that by embracing network flooding in combination with simultaneous transmissions, we can realize low latency event-triggered multi-hop communication without having to sacrifice energy efficiency. We introduce an analytical model to quantify the limits of our approach, present a prototype implementation using a multi-radio wireless sensor platform, and experimentally evaluate BLITZ in a laboratory setting and in an indoor testbed. © 2017 Association for Computing Machinery.

关键词： Network architecture

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