Publications
Journal Articles | Conference Contributions | Technical Reports | Students' Theses
Journal Articles
Christian Renner and Volker Turau. Adaptive Energy-Harvest Profiling to Enhance Depletion-Safe Operation and Efficient Task Scheduling. Sustainable Computing: Informatics and Systems, 2(1):43–56, March 2012.
@Article{Telematik_RT_2012_AdaptiveSlotting,
author = {Christian Renner and Volker Turau},
title = {Adaptive Energy-Harvest Profiling to Enhance Depletion-Safe Operation and Efficient Task Scheduling},
pages = {43-56},
journal = {Sustainable Computing: Informatics and Systems},
volume = {2},
number = {1},
month = mar,
year = 2012,
issn = {2210-5379},
}
Abstract:
Forecasting the expected energy harvest enables small-sized energy-harvesting sensor nodes to schedule tasks or adapt the radio duty cycle. This ability ensures depletion-safe and efficient operation. Most energy sources exhibit cyclic patterns of intensity, e.g., the sun. These patterns show periods with unequal--low versus high and stable versus varying--energy production and heavily depend on a node's location as well as seasonal and environmental changes. Existing forecast algorithms do not exploit these patterns, but create and update forecasts at static and arbitrary points in time, the main knob being the number of updates per cycle. We present a method enabling sensor nodes to adapt to harvesting patterns at runtime. It is designed for seamlessly replacing the static scheme to improve the accuracy of a wide range of existing forecast algorithms.
In our evaluation, we show that (i) the adaptive method traces the energy pattern in real-world deployments accurately, (ii) reacts to seasonal and environmental changes, (iii) increases forecast accuracy, and (iv) reduces the number of prediction updates. These achievements enhance depletion-safe operation and efficient task scheduling with fewer recalculations and adjustments of the duty cycle. They also facilitate the exchange of harvesting forecasts for collaborative node tasks, since less information has to be shared.
Thomas Czerwionka, Corinna Peters and Christian Renner. ePortfolios an der TUHH. Konzeption und aktueller Stand
im ELCH-Projekt "studIPort 2.0". Hamburger eLearning Magazin, 2:35–36, 2009.
@Article{Peters_EL2009,
author = {Thomas Czerwionka and Corinna Peters and Christian Renner},
title = {ePortfolios an der TUHH. Konzeption und aktueller Stand
im ELCH-Projekt "studIPort 2.0"},
pages = {35-36},
journal = {Hamburger eLearning Magazin},
volume = {2},
year = 2009,
}
Conference Contributions
Christian Renner, Florian Meier and Volker Turau. Holistic Online Energy Assessment: Feasibility and Practical Application. In Proceedings of the 9th IEEE International Conference on Networked Sensing Systems (INSS'12), June 2012. Antwerp, Belgium. To be published.
@InProceedings{Telematik_RT_2012_HolisticEnergyAssessment,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Holistic Online Energy Assessment: Feasibility and Practical Application},
booktitle = {Proceedings of the 9th IEEE International Conference on Networked Sensing Systems (INSS'12)},
day = {11-14},
month = jun,
year = 2012,
location = {Antwerp, Belgium},
}
Abstract:
Combining energy harvesting with energy-aware scheduling enables perpetually operating sensor networks. The practical realization of this goal yet requires reliable and precise holistic online energy assessment. While the building blocks--assessing residual energy, predicting energy intake, and tracing energy consumption--have been studied in detail, the analysis of their interaction on a real platform has been neglected.
This paper answers the question, whether these techniques can be easily joined to give a precise and correct picture of a sensor node's energetic state and behavior.
For this purpose, we model the energy flow of a prototype energy-harvesting sensor node and evaluate the joint performance of state-of-the-art energy assessment based on a field test. We verify the system model and show the feasibility of holistic energy assessment, which tolerates small configuration errors, achievable with a combination of generic configuration and online calibration.
We also analyze the feasibility of forecasting a node's future energetic state, and find that the presented method gives sufficient results for uniformly distributed consumption profiles.
Christian Renner, Florian Meier and Volker Turau. Policies for Predictive Energy Management with Supercapacitors. In Proceedings of the 8th IEEE International Workshop on Sensor Networks and Systems for Pervasive Computing (PerSeNS'12), March 2012. Lugano, Switzerland.
@InProceedings{Telematik_RT_2012_Epol,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Policies for Predictive Energy Management with Supercapacitors},
booktitle = {Proceedings of the 8th IEEE International Workshop on Sensor Networks and Systems for Pervasive Computing (PerSeNS'12)},
day = {19-23},
month = mar,
year = 2012,
location = {Lugano, Switzerland},
}
Abstract:
This paper presents an algorithm to dynamically determine the maximum supported uniform demand for energy of sensor nodes powered by energy harvesters using supercapacitors as energy buffers. Knowledge about the maximum uniform consumption is required to adapt the sensor node's duty cycle or task schedule to achieve uniform, utility-maximizing, and depletion-safe operation. Our algorithm makes use of a supercapacitors' relationship between state-of-charge and voltage, is particularly designed to handle the non-linear system model, and is lightweight enough to run on low-power sensor node hardware. We define three energy policies, evaluate their performance using a real-world solar-harvesting trace, and analyze the influence of the supercapacitor's capacity and errors of the energy forecast.
Christian Renner, Florian Meier and Volker Turau. Poster Abstract: Energy Assessment in Praxis. In Adjunct Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12), February 2012. Trento, Italy.
@InProceedings{Telematik_RT_2012_EnergyAssessment,
author = {Christian Renner and Florian Meier and Volker Turau},
title = {Poster Abstract: Energy Assessment in Praxis},
booktitle = {Adjunct Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12)},
day = {15-17},
month = feb,
year = 2012,
location = {Trento, Italy},
}
Abstract:
Combining energy harvesting with energy-aware scheduling enables perpetually operating sensor networks. Practical realization yet requires precise holistic online energy assessment. The building blocks are available, but the analysis of their interaction has been neglected. To close the gap, we evaluate the joint performance of energy assessment components. Our experiments substantiate that holistic energy assessment is feasible and that small configuration errors are tolerable.
Stefan Unterschütz, Christian Renner and Volker Turau. Opportunistic, Receiver-Initiated Data-Collection Protocol. In Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12), February 2012. Trento, Italy.
@InProceedings{Telematik_URT_2012_Orinoco,
author = {Stefan Unterschütz and Christian Renner and Volker Turau},
title = {Opportunistic, Receiver-Initiated Data-Collection Protocol},
booktitle = {Proceedings of the 9th European Conference on Wireless Sensor Networks (EWSN'12)},
day = {15-17},
month = feb,
year = 2012,
location = {Trento, Italy},
}
Abstract:
This paper presents and evaluates ORiNoCo, a novel data-collection and event-reporting protocol for sensor networks. ORiNoCo is built upon the asynchronous duty-cycle protocol RI-MAC and breaks with the tradition of exchanging extensive neighborhood information, a cornerstone of many competing collection protocols and one of their major source of communication overhead and energy expenditure. The merit of this venture is an opportunistic, energy-efficient, latency-reducing, and self-stabilizing protocol. ORiNoCo comes at virtually no extra costs in terms of memory demand and communication overhead compared to RI-MAC. We derive theoretical boundaries for the improvements in radio efficiency, latency, and energy-consumption. ORiNoCo is verified with these findings via simulation and compared with CTP. ORiNoCo achieves lower energy-consumption while reducing end-to-end delays.
Christian Renner, Sebastian Ernst, Christoph Weyer and Volker Turau. Prediction Accuracy of Link-Quality Estimators. In Proceedings of the 8th European Conference on
Wireless Sensor Networks (EWSN'11), February 2011. Bonn, Germany. Acceptance rate 20%.
@InProceedings{Telematik_REWT_HoPS,
author = {Christian Renner and Sebastian Ernst and Christoph Weyer and Volker Turau},
title = {Prediction Accuracy of Link-Quality Estimators},
booktitle = {Proceedings of the 8th European Conference on
Wireless Sensor Networks (EWSN'11)},
day = {23-25},
month = feb,
year = 2011,
location = {Bonn, Germany},
note = {Acceptance rate 20%},
}
Abstract:
The accuracy of link-quality estimators (LQE) is
mission-critical in
many application scenarios in wireless sensor
networks (WSN), since
the link-quality metric is used for routing
decisions or neighborhood
formation. Link-quality estimation must
offer validity for different
timescales. Existing LQEs describe and
approximate the current
quality in a single value only. This method
leads to a limited
accuracy and expressiveness about the presumed
future behavior of a
link. The LQE developed in this paper
incorporates four quality
metrics that give a holistic assessment of
the link and its dynamic
behavior; therefore, this research is an
important step to achieving
a higher prediction accuracy including
knowledge about the short- and
long-term behavior.
Christian Renner, Volker Turau and Christoph Weyer. Performance of Energy-Efficient TDMA Schemes in
Data-Gathering Scenarios with Periodic Sources. In Proceedings of the 7th IEEE International
Conference on Networked Sensing Systems (INSS'10), June 2010. Kassel, Germany. Acceptance rate 22%.
@InProceedings{Telematik_RTW_EnergyEfficientTDMA,
author = {Christian Renner and Volker Turau and Christoph Weyer},
title = {Performance of Energy-Efficient TDMA Schemes in
Data-Gathering Scenarios with Periodic Sources},
booktitle = {Proceedings of the 7th IEEE International
Conference on Networked Sensing Systems (INSS'10)},
day = {15-18},
month = jun,
year = 2010,
location = {Kassel, Germany},
note = {Acceptance rate 22%},
}
Abstract:
Energy-efficient transportation of periodical sensor
readings towards a single sink
in wireless sensor networks is a
challenging task. In general, two
data-gathering strategies exist:
on-demand and bulk data forwarding.
For both strategies, cross-layer
techniques are a promising approach,
where TDMA is tailored to the
underlying routing tree. Therefore,
different TDMA schemes are
compared regarding achievable throughput,
packet delay, and
energy-efficiency for various sampling rates and
scenarios. Existing
schemes perform well in dedicated topologies
only. The new and simple
TDMA scheme presented in this paper
outperforms its predecessors in
all scenarios under consideration.
These findings are substantiated by
both theoretical analysis and
extensive simulation.
Christian Renner and Volker Turau. CapLibrate: Self-Calibration of an Energy Harvesting
Power Supply with Supercapacitors. In Proceedings of the GI/ITG Workshop on Energy-aware
Systems and Methods, February 2010. Hannover, Germany.
@InProceedings{Telematik_RT_2010_CapLibrate,
author = {Christian Renner and Volker Turau},
title = {CapLibrate: Self-Calibration of an Energy Harvesting
Power Supply with Supercapacitors},
booktitle = {Proceedings of the GI/ITG Workshop on Energy-aware
Systems and Methods},
day = {22-23},
month = feb,
year = 2010,
location = {Hannover, Germany},
}
Abstract:
Achieving perpetual and self-sustaining operation of
wireless sensor nodes is
an important topic of current research in the
field of energy
harvesting. Closely related to this is the employment
of energy
budgeting, i.e., effective utilization of available and
future energy
resources without pushing a node towards the hazard of
energy
depletion. Therefore, reliable prediction of node lifetime in
context
of the available energy within a given time is required. This
in turn
requires self-calibration of the sensor nodes and their energy
harvesting supply. In this paper, we explore and assess models for a
supercapacitor-based harvesting supply. The parameters of the models
are discussed and determined, so that fast, reliable, and
energy-efficient calibration becomes possible. Moreover, measurement
results for a specific hardware platform are discussed and a roadmap
for a self-calibration algorithm is presented.
Christian Renner, Jürgen Jessen and Volker Turau. Poster: Energy Estimation for Harvesting Supplies with Supercaps. In Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks, October 2009. Hamburg, Germany.
@InProceedings{Telematik_RJT_2009_EnergyEstimation,
author = {Christian Renner and Jürgen Jessen and Volker Turau},
title = {Poster: Energy Estimation for Harvesting Supplies with Supercaps},
booktitle = {Proceedings of the Workshop on Self-Organizing
Wireless Sensor and Communication Networks},
day = {8-9},
month = oct,
year = 2009,
location = {Hamburg, Germany},
}
Christoph Weyer, Christian Renner, Volker Turau and Hannes Frey. TinyAID: Automated Instrumentation and Evaluation
Support for TinyOS. In Proceedings of the Second International Workshop on
Sensor Network Engineering (IWSNE'09), June 2009. Marina del Rey, CA, USA.
@InProceedings{Telematik_WRTF_2009_TinyAID,
author = {Christoph Weyer and Christian Renner and Volker Turau and Hannes Frey},
title = {TinyAID: Automated Instrumentation and Evaluation
Support for TinyOS},
booktitle = {Proceedings of the Second International Workshop on
Sensor Network Engineering (IWSNE'09)},
day = {10},
month = jun,
year = 2009,
location = {Marina del Rey, CA, USA},
}
Abstract:
TinyAID is a tool that supports automated
instrumentation and evaluation of TinyOS-based distributed
applications. Two types of instrumentations are provided: logging of
call chains and message flows within the network. TinyAID assists the
debugging process by post evaluation of the logged data. A main
benefit is the visualization component for representing traces in
their spatial and temporal order. The instrumentation and evaluation
concepts are evaluated in two case studies: the SelfWISE framework
and a selection of routing algorithms. Due to the automated process
of TinyAID the evaluation could be performed without a deeper
knowledge of the implementations under test. In the first case
TinyAID revealed a weakness in the TOSSIM random number generator.
The second case demonstrates the power of TinyAID to visualize the
quality of protocols in a unified manner, without any manual changes
to the specific source code.
Kay Römer and Christian Renner. Aggregating Sensor Data from Overlapping Multi-Hop
Network Neighborhoods: Push or Pull?. In Proceedings of the International Conference on
Networked Sensing Systems (INSS'08), June 2008, pp. 107–110. Kanazawa, Japan.
@InProceedings{Telematik_RR_2008_PushOrPull,
author = {Kay Römer and Christian Renner},
title = {Aggregating Sensor Data from Overlapping Multi-Hop
Network Neighborhoods: Push or Pull?},
booktitle = {Proceedings of the International Conference on
Networked Sensing Systems (INSS'08)},
pages = {107-110},
day = {17-19},
month = jun,
year = 2008,
location = {Kanazawa, Japan},
}
Abstract:
Network neighborhoods are a key communication
abstraction in sensor networks, allowing sensor nodes to collect and
aggregate sensor data from nearby other nodes. In many applications,
multi-hop neighborhoods of several nodes overlap, such that nodes
participate in many neighborhoods, having to contribute their data
items to all containing neighborhoods. We consider two orthogonal
approaches to efficiently support this data aggregation problem. A
push-based approach, where each node floods its data item in a
multi-hop neighborhood, and a pull-based approach, where each node
collects data from nodes in a multi-hop network neighborhood using a
spanning tree. Our goal is to identify situations where one approach
outperforms the other. For this, we implement these protocols in
TOSSIM, study overhead and yield as a function of the fraction of
nodes in the network that perform data aggregation over a multi-hop
neighborhood, and report our findings.
Volker Turau, Christoph Weyer and Christian Renner. Efficient Slot Assignment for the Many-to-One Routing
Pattern in Sensor Networks. In Proceedings of the First International Workshop on
Sensor Network Engineering (IWSNE'08), June 2008. Santorini Island, Greece.
@InProceedings{Telematik_TWR_2008_SlotAssignmentManyOne,
author = {Volker Turau and Christoph Weyer and Christian Renner},
title = {Efficient Slot Assignment for the Many-to-One Routing
Pattern in Sensor Networks},
booktitle = {Proceedings of the First International Workshop on
Sensor Network Engineering (IWSNE'08)},
day = {11},
month = jun,
year = 2008,
location = {Santorini Island, Greece},
}
Abstract:
In this paper an efficient TDMA slot assignment for
the many-to-one routing pattern in wireless sensor networks is
presented and analyzed. This assignment scheme is based on a simple
to implement heuristic, named spatial path-based reuse (SPR). By
considering several metrics, the superiority of this heuristic with
respect to energy consumption and runtime compared to proposals found
in the literature is demonstrated.
Volker Turau, Christian Renner, Marcus Venzke, Sebastian Waschik, Christoph Weyer and Matthias Witt. The Heathland Experiment: Results And Experiences. In Proceedings of the Workshop on Real-World Wireless
Sensor Networks (REALWSN'05), June 2005. Stockholm, Sweden.
@InProceedings{Telematik_TRVWWW_2005_Heathland,
author = {Volker Turau and Christian Renner and Marcus Venzke and Sebastian Waschik and Christoph Weyer and Matthias Witt},
title = {The Heathland Experiment: Results And Experiences},
booktitle = {Proceedings of the Workshop on Real-World Wireless
Sensor Networks (REALWSN'05)},
day = {20-21},
month = jun,
year = 2005,
location = {Stockholm, Sweden},
}
Abstract:
This paper reports on the experience gained during a
real-world
deployment of a sensor network based on the ESB platform in
the
heathlands of Northern Germany. The goal of the experiment was to
gain a deeper insight into the problems of real deployments as
opposed to simulated networks. The focus of this report is on the
quality of radio links and the influence of the link quality on
multi-hop routing.
Technical Reports
Christian Renner, Stefan Unterschütz and Volker Turau. Power Management for Wireless Sensor Networks Based on
Energy Budgets. Technical Report urn:nbn:de:gbv:830-tubdok-11065, Hamburg University of Technology, Hamburg, Germany, July 2011.
@TechReport{Renner_Unterschuetz_PowerManagement-TechReport,
author = {Christian Renner and Stefan Unterschütz and Volker Turau},
title = {Power Management for Wireless Sensor Networks Based on
Energy Budgets},
number = {urn:nbn:de:gbv:830-tubdok-11065},
institution = {Hamburg University of Technology},
address = {Hamburg, Germany},
month = jul,
year = 2011,
}
Abstract:
This paper proposes and assesses analytical tools for
large-scale
monitoring applications with wireless sensor networks
powered by
energy-harvesting supplies. We introduce the concept of an
energy
budget, the amount of energy available to a sensor node for a
given period of time. The presented tools can be utilized to
realize
distributed algorithms that determine a schedule to
perform the
monitoring task and the inherent communication.
Scheduling is based on
the energy budgets of the nodes or on
latency requirements. In this
context, we derive theoretical
results for the energy consumption of
the individual nodes plus
the latency of event-reporting. These
results are verified by
simulations and a real testbed implementation.
Sebastian Ernst, Christian Renner, Christoph Weyer and Volker Turau. Holistic Packet Statistics for Neighborhood Management
in Sensor Networks. In Proceedings of the 9th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'10), September 2010, pp. 17–20. Würzburg, Germany.
@InProceedings{Telematik_ERWT_HoPS,
author = {Sebastian Ernst and Christian Renner and Christoph Weyer and Volker Turau},
title = {Holistic Packet Statistics for Neighborhood Management
in Sensor Networks},
booktitle = {Proceedings of the 9th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'10)},
pages = {17-20},
day = {16-17},
month = sep,
year = 2010,
location = {Würzburg, Germany},
}
Abstract:
Knowledge of neighboring nodes is a fundamental
requirement of many algorithms
in the field of wireless sensor
networks.
The neighborhood relation of nodes is defined by their
ability to
communicate directly and not by their proximity.
Due to the
temporal changes of the wireless channel, link qualities must
be
continuously estimated.
In this paper a new approach based on holistic
packet statistics is
presented.
Unlike existing estimation techniques
it forswears from squeezing a link's
characteristics into a single
value.
The benefit of this approach is substantiated by an evaluation
utilizing
real-world and synthetic data.
Christoph Weyer, Christian Renner, Volker Turau and Hannes Frey. A Roadmap for Hardware and Software Support for
Developing Energy-Efficient Sensor Networks. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 67–70. Hamburg, Germany.
@InProceedings{Telematik_WRTF_2009_Roadmap,
author = {Christoph Weyer and Christian Renner and Volker Turau and Hannes Frey},
title = {A Roadmap for Hardware and Software Support for
Developing Energy-Efficient Sensor Networks},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {67-70},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
Support for developing energy-efficient applications
for wireless sensor
networks is still scarce.
In this paper a roadmap
of a combined hardware and software approach is
presented. The main
idea is
to collect state information and trace energy consumption of
an
application running in a testbed of
real sensor nodes.
Felix Hackbarth, Thomas Meyerhoff, Harald Sauff, Bryce T. Bradford, Luis Torres, Helge Klimek, Björn Gressmann, Christian Renner, Martin Stemick, Christoph Weyer and Sebastian Georgi. SomSed - The Evolution of an Experimental Wireless
Sensor Network Towards a Research Platform. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 27–30. Hamburg, Germany.
@InProceedings{Telematik_HMSB_2009_SomSeD,
author = {Felix Hackbarth and Thomas Meyerhoff and Harald Sauff and Bryce T. Bradford and Luis Torres and Helge Klimek and Björn Gressmann and Christian Renner and Martin Stemick and Christoph Weyer and Sebastian Georgi},
title = {SomSed - The Evolution of an Experimental Wireless
Sensor Network Towards a Research Platform},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {27-30},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
The exploratory focus of the SomSed research field is
the
interdisciplinary research on self organizing mobile
sensor and
data networks. Since the founding of SomSed in 2007, great
progress in
scientific research has been
achieved and much practical knowledge has
been gathered using a prototype
network permanently installed. This
prototype network, from hereon referred to as CampusNet, is the basis
for
further investigations and offers the
possibility to perform long
term measurements in a large scale and real
environment. The scope of
this paper is
to outline the current status of the SomSed research
field and to
briefly discuss future developments.
Lars Niemann, Marcus Venzke, Christian Renner and Volker Turau. Clock Synchronization of TinyOS-based Sensor Networks
with DCF77. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 45–46. Hamburg, Germany.
@InProceedings{Telematik_NVRT_2009_DCF77,
author = {Lars Niemann and Marcus Venzke and Christian Renner and Volker Turau},
title = {Clock Synchronization of TinyOS-based Sensor Networks
with DCF77},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {45-46},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
The paper presents an approach of applying DCF77 time
radio signals to
provide a clock with global time in sensor
networks
based on TinyOS. Some nodes containing DCF77 receiver hardware
reliably decode time signals even if these are
distorted to some
extent. The clock with global time is provided by
compensating clock
drift. Time is distributed in
the network with a protocol generating
timestamps on the MAC layer.
Christian Renner, Jürgen Jessen and Volker Turau. Lifetime Prediction for Supercapacitor-powered Wireless
Sensor Nodes. In Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09), August 2009, pp. 55–58. Hamburg, Germany.
@InProceedings{Telematik_RJT_2009_Supercap,
author = {Christian Renner and Jürgen Jessen and Volker Turau},
title = {Lifetime Prediction for Supercapacitor-powered Wireless
Sensor Nodes},
booktitle = {Proceedings of the 8th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'09)},
pages = {55-58},
day = {13-14},
month = aug,
year = 2009,
location = {Hamburg, Germany},
}
Abstract:
Energy-aware task scheduling is a novel research
direction for wireless sensor
networks. It depends on accurate
models
for lifetime prediction. In other terms, nodes must be aware of
present and future energy resources. This
paper addresses the first
step towards reaching this goal: It explores
discharging-characteristics of
supercapacitors, discusses analytical
discharging-models for lifetime prediction, and
evaluates these models
by
comparing them with real discharging curves.
Sebastian Georgi, Christoph Weyer, Martin Stemik, Christian Renner, Felix Hackbarth, Ulf Pilz, Jens Eichmann, Tobias Pilsak, Harald Sauff, Luis Torres, Klaus Dembowski and Fabian Wagner. SomSeD: An Interdisciplinary Approach for Developing
Wireless Sensor Networks. In Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08), September 2008. Berlin, Germany.
@InProceedings{Telematik_GWSR_2008_SOMSeD,
author = {Sebastian Georgi and Christoph Weyer and Martin Stemik and Christian Renner and Felix Hackbarth and Ulf Pilz and Jens Eichmann and Tobias Pilsak and Harald Sauff and Luis Torres and Klaus Dembowski and Fabian Wagner},
title = {SomSeD: An Interdisciplinary Approach for Developing
Wireless Sensor Networks},
booktitle = {Proceedings of the 7th GI/ITG KuVS Fachgespräch
"Drahtlose Sensornetze" (FGSN'08)},
day = {25-26},
month = sep,
year = 2008,
location = {Berlin, Germany},
}
Abstract:
The research field "Self organized mobile Sensor and
Data-networks" (SomSeD) is introduced. Its purpose is the in-
vestigation of Wireless Sensor Networks (WSN). It benefits from
interdisciplinary exchange between various institutes of the Hamburg
University of Technology (TUHH). Due to different design constraints
(such as energy-efficiency and package size) compared to well known
classical computer networks, all aspects of the development of WSNs
must be reconsidered. This paper describes the advantage of having
experts of various faculties both in computer science and electrical
engineering in a single research field. In addition to the
introduction of the participating institutes, the de-
ployment of a
WSN on the TUHH campus will be outlined.
Students' Theses
Christian Renner. Energy-Efficient TDMA Schedules for Data-Gathering in
Wireless Sensor Networks. Diploma Thesis, Hamburg University of Technology, Hamburg, Germany, June 2008.
@MastersThesis{Renner_2008_DiplomaThesis,
author = {Christian Renner},
type = {Diploma Thesis},
title = {Energy-Efficient TDMA Schedules for Data-Gathering in
Wireless Sensor Networks},
school = {Hamburg University of Technology},
address = {Hamburg, Germany},
month = jun,
year = 2008,
}