@inproceedings{ordonezmuller_2015, abstract = {In infrared thermography, the temperature measured by a thermal imaging device varies with the position and orientation of the camera with respect to an object's surface. 3D thermography has hence the potential to depict the surface temperature of objects with higher fidelity than conventional 2D thermography. So far the problem of assigning temperature values that correspond to the same surface but were obtained from different perspectives has been addressed by simply overwriting previous values with new values or by averaging the measured values according to a weighted averaging scheme. A new approach to map temperature values onto a 3D model is proposed that results in a more faithful representation of an object's real surface temperature in form of a 3D thermogram. Temperature values are assigned in real time to the 3D model taking into consideration the observation conditions under which they were measured. These conditions are also made available to the user in form of textured 3D models, where the texture color depicts the level of confidence associated to the thermal measurements. These textures provide useful additional information about the 3D thermogram. The new approach is especially helpful in the real-time generation of 3D thermograms as the user gets live feedback on the quality of the thermal model being generated.}, address = {Auckland, New Zealand}, author = {Ordonez Müller, Antonio and Kroll, A.}, booktitle = {9th International Conference on Sensing Technology (ICST 2015)}, comment = {======= Review 1 ======= > *** Guidance for Authors: Please describe in detail main paper contributions, positive aspects, observed deficiencies, and suggestions on how to improve them: This is a well presented paper that stakes a clear claim for improved creation of 3D thermograms. It will be interesting in future to see the results of a comparison between the imaging system and independent (e.g. contact) temperature measurements of the same objects. > *** Overall Rating: Do you recommend acceptance or rejection? Accept (5) > *** Presentation: How would you rate the presentation of this paper? Strong Accept (6) > *** Technical Quality: How would you rate the technical quality of this paper? Accept (5) > *** Significance of Topic: Is this topic significant to ICST 2015? Accept (5) > *** Originality: How would you rate the originality of the paper? Accept (5) ======= Review 2 ======= > *** Guidance for Authors: Please describe in detail main paper contributions, positive aspects, observed deficiencies, and suggestions on how to improve them: Very interesting work. What is the resolution of such images? > *** Overall Rating: Do you recommend acceptance or rejection? Strong Acception (6) > *** Presentation: How would you rate the presentation of this paper? Strong Accept (6) > *** Technical Quality: How would you rate the technical quality of this paper? Strong Accept (6) > *** Significance of Topic: Is this topic significant to ICST 2015? Strong Accept (6) > *** Originality: How would you rate the originality of the paper? Strong Accept (6)}, doi = {10.1109/ICSensT.2015.7438397}, interhash = {d253ae4aef866b58bfbf2d3a811b9c38}, intrahash = {5faf522e84482f866ecd70efafd6223e}, language = {english}, month = {December 8. -- 10.}, mrtnote = {robotair, peer}, owner = {Ordonez Müller}, pages = {235-240}, title = {On the Temperature Assignment Problem and the Use of Confidence Textures in the Creation of 3D Thermograms}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7438397}, year = 2015 } @inproceedings{Barz2012, abstract = {Industrial plants are a vital and common asset of modern society in a various number of ways. Safety of large industrial complexes that handle hazardous chemical materials is of utter importance to prevent harm to employees, general population, our natural environment and valuable infrastructure. Therefore, beside the plant owner's own financial interest to guarantee faultless and safe operation, legal regulations have to be adhered due to strong public interest as well. An important measure to ensure safety is the implementation of regular inspection tours by maintenance personnel, who examine the often widely-stretched process infrastructure on foot and locally search for signs of beginning leakage. The Research Project RoboGasInspector was started to develop new means of aiding with the fulfillment of this essential task. This article gives an insight into this ongoing research project, where autonomous mobile robotics is combined with laser-based remote gas detection technology in order to create a proof-of-concept inspection system prototype, which can relieve humans of this monotonous and highly repetitive work.}, address = {Bonn}, author = {Barz, Thomas and Bonow, Gero and Hegenberg, Jens and Habib, Karim and Cramar, Liubov and Welle, Jochen and Schulz, Dirk and Kroll, Andreas and Schmidt, Ludger}, booktitle = {Future Security}, doi = {10.1007/978-3-642-33161-9_32}, editor = {Aschenbruck, Nils and Martini, Peter and Meier, Michael and Tölle, Jens}, interhash = {2f9b6fca76112c9f9bdf30d15c5fd58d}, intrahash = {feef2e37bff7d7ad0edf6c46ecae7f73}, isbn = {978-3-642-33160-2}, language = {english}, month = {4th -- 6th September}, mrtnote = {robogas,peer}, owner = {bonow}, pages = {216-219}, publisher = {Springer Berlin Heidelberg}, series = {Communications in Computer and Information Science}, title = {Unmanned Inspection of Large Industrial Environments -- Insights into Research Project RoboGasInspector}, url = {http://dx.doi.org/10.1007/978-3-642-33161-9_32}, volume = 318, year = 2012 } @inproceedings{Barz2012, abstract = {Industrial plants are a vital and common asset of modern society in a various number of ways. Safety of large industrial complexes that handle hazardous chemical materials is of utter importance to prevent harm to employees, general population, our natural environment and valuable infrastructure. Therefore, beside the plant owner’s own financial interest to guarantee faultless and safe operation, legal regulations have to be adhered due to strong public interest as well. An important measure to ensure safety is the implementation of regular inspection tours by maintenance personnel, who examine the often widely-stretched process infrastructure on foot and locally search for signs of beginning leakage. The Research Project RoboGasInspector was started to develop new means of aiding with the fulfillment of this essential task. This article gives an insight into this ongoing research project, where autonomous mobile robotics is combined with laser-based remote gas detection technology in order to create a proof-of-concept inspection system prototype, which can relieve humans of this monotonous and highly repetitive work.}, address = {Bonn}, author = {Barz, Thomas and Bonow, Gero and Hegenberg, Jens and Habib, Karim and Cramar, Liubov and Welle, Jochen and Schulz, Dirk and Kroll, Andreas and Schmidt, Ludger}, booktitle = {Future Security}, doi = {10.1007/978-3-642-33161-9_32}, editor = {Aschenbruck, Nils and Martini, Peter and Meier, Michael and Tölle, Jens}, interhash = {2f9b6fca76112c9f9bdf30d15c5fd58d}, intrahash = {feef2e37bff7d7ad0edf6c46ecae7f73}, isbn = {978-3-642-33160-2}, language = {english}, month = {4th – 6th September}, mrtnote = {robogas,peer}, owner = {bonow}, pages = {216-219}, publisher = {Springer Berlin Heidelberg}, series = {Communications in Computer and Information Science}, title = {Unmanned Inspection of Large Industrial Environments - Insights into Research Project RoboGasInspector}, url = {http://dx.doi.org/10.1007/978-3-642-33161-9_32}, volume = 318, year = 2012 } @inproceedings{ordonezmuller_2015, abstract = {In infrared thermography, the temperature measured by a thermal imaging device varies with the position and orientation of the camera with respect to an object's surface. 3D thermography has hence the potential to depict the surface temperature of objects with higher fidelity than conventional 2D thermography. So far the problem of assigning temperature values that correspond to the same surface but were obtained from different perspectives has been addressed by simply overwriting previous values with new values or by averaging the measured values according to a weighted averaging scheme. A new approach to map temperature values onto a 3D model is proposed that results in a more faithful representation of an object's real surface temperature in form of a 3D thermogram. Temperature values are assigned in real time to the 3D model taking into consideration the observation conditions under which they were measured. These conditions are also made available to the user in form of textured 3D models, where the texture color depicts the level of confidence associated to the thermal measurements. These textures provide useful additional information about the 3D thermogram. The new approach is especially helpful in the real-time generation of 3D thermograms as the user gets live feedback on the quality of the thermal model being generated.}, address = {Auckland, New Zealand}, author = {Ordonez Müller, Antonio and Kroll, A.}, booktitle = {9th International Conference on Sensing Technology (ICST 2015)}, interhash = {d253ae4aef866b58bfbf2d3a811b9c38}, intrahash = {5faf522e84482f866ecd70efafd6223e}, language = {english}, month = {December 8. - 10.}, mrtnote = {robotair, peer}, owner = {Ordonez Müller}, pages = {235-240}, review = {======= Review 1 ======= > *** Guidance for Authors: Please describe in detail main paper contributions, positive aspects, observed deficiencies, and suggestions on how to improve them: This is a well presented paper that stakes a clear claim for improved creation of 3D thermograms. It will be interesting in future to see the results of a comparison between the imaging system and independent (e.g. contact) temperature measurements of the same objects. > *** Overall Rating: Do you recommend acceptance or rejection? Accept (5) > *** Presentation: How would you rate the presentation of this paper? Strong Accept (6) > *** Technical Quality: How would you rate the technical quality of this paper? Accept (5) > *** Significance of Topic: Is this topic significant to ICST 2015? Accept (5) > *** Originality: How would you rate the originality of the paper? Accept (5) ======= Review 2 ======= > *** Guidance for Authors: Please describe in detail main paper contributions, positive aspects, observed deficiencies, and suggestions on how to improve them: Very interesting work. What is the resolution of such images? > *** Overall Rating: Do you recommend acceptance or rejection? Strong Acception (6) > *** Presentation: How would you rate the presentation of this paper? Strong Accept (6) > *** Technical Quality: How would you rate the technical quality of this paper? Strong Accept (6) > *** Significance of Topic: Is this topic significant to ICST 2015? Strong Accept (6) > *** Originality: How would you rate the originality of the paper? Strong Accept (6)}, title = {On the Temperature Assignment Problem and the Use of Confidence Textures in the Creation of 3D Thermograms}, url = {http://seat.massey.ac.nz/conferences/icst2015/}, year = 2015 } @phdthesis{knell2016interferometrische, abstract = {Ziel dieser Dissertation ist es, eine Klasse interferometrischer Messgeräte zu charakterisieren und weiter zu entwickeln. Die Modulation der optischen Weglänge (OPLM) im Referenzarm eines interferometrischen Messsystems ist ein anpassungsfähiger Ansatz. Sie ist zur Messung von Oberächenprolen mit einer Auösung bis in den sub-nm-Bereich bei einem Messbereich von bis zu 100 m geeignet. Wird ein statisches Messobjekt gemessen, tritt durch die Modulation im Referenzarm am Detektor ein periodisches Interferenzmuster auf. Dies ist in der unten stehenden Abbildung schematisch dargestellt. Bei einer Veränderung des Abstandes zwischen Objekt und Messgerät kann aus der Phasen- und/oder Hüllkurvenverschiebung im Interferenzmuster die Abstandsänderung abgeleitet werden. Im Rahmen der Arbeit sind zwei funktionsfähige OPLM-Messsysteme entwickelt, aufgebaut und getestet worden. Diese demonstrieren, dass der OPLM-Ansatz ein breites Spektrum an Anwendungen durch eine optische Messung abdecken kann. Allerdings zeigen sich an den Messsystemen auch die Limitierungen des OPLM-Ansatzes. Die Systeme basieren auf einer Punktmessung mittels einer fasergekoppelten Sonde sowie auf einer linienförmigen Messung durch eine Zeilenkamera. Um eine hohe laterale Auösung zu erzielen, wird die Zeilenkamera mit einem Mikroskop kombiniert. Damit ächenhaft gemessen werden kann, ist es notwendig, Messobjekt und Sensor zueinander zu verschieben. Daher wird eine Theorie entwickelt, unter welchen Randbedingungen bewegte Objekte von einem OPLM-Messsystem aufgelöst werden können. Die Theorie wird anschlieÿend experimentell überprüft und bestätigt. Für die Auswertung der bei der Modulation der optischen Weglänge entstehenden Interferenzen existieren bereits einige erprobte Algorithmen, welche auf ihre Eignung hin untersucht und mit selbst entwickelten Algorithmen verglichen werden. Auch wird darauf eingegangen, welches die zentralen Herausforderungen bei der Planung von OPLM-Interferometern sind und wie sich insbesondere die Wahl des Aktors für die OPLM auf das gesamte Messsystem auswirkt. Bei den beiden Messsystemen werden jeweils wichtige Komponenten wie analoge Elektronik und Aktorik sowie ihre Funktionsweise erläutert. Es wird detailliert beschrieben, wie ein OPLMMesssystem charakterisiert und kalibriert werden muss, um möglichst zuverlässige Messwerte zu liefern. Abschlieÿend werden die Möglichkeiten der beiden entwickelten Systeme durch Beispielmessungen demonstriert, sowie ihre Messgenauigkeit charakterisiert.}, address = {Kassel}, author = {Knell, Holger Werner}, editor = {Knell, Holger Werner}, interhash = {4836dffdfcfcf9ab12bad2131bcf8ed5}, intrahash = {1decd66a54b7e8023ecbed3977a9e7f2}, month = feb, school = {Universität Kassel}, title = {Interferometrische Sensoren mit Modulation der optischen Weglänge für die Fertigungsmesstechnik}, type = {Dissertation}, year = 2016 } @inproceedings{mueller2013recommendations, abstract = {With the rising popularity of smart mobile devices, sensor data-based applications have become more and more popular. Their users record data during their daily routine or specifically for certain events. The application WideNoise Plus allows users to record sound samples and to annotate them with perceptions and tags. The app is being used to document and map the soundscape all over the world. The procedure of recording, including the assignment of tags, has to be as easy-to-use as possible. We therefore discuss the application of tag recommender algorithms in this particular scenario. We show, that this task is fundamentally different from the well-known tag recommendation problem in folksonomies as users do no longer tag fix resources but rather sensory data and impressions. The scenario requires efficient recommender algorithms that are able to run on the mobile device, since Internet connectivity cannot be assumed to be available. Therefore, we evaluate the performance of several tag recommendation algorithms and discuss their applicability in the mobile sensing use-case.}, address = {Aachen, Germany}, author = {Mueller, Juergen and Doerfel, Stephan and Becker, Martin and Hotho, Andreas and Stumme, Gerd}, booktitle = {Recommender Systems and the Social Web Workshop at 7th ACM Conference on Recommender Systems, RecSys 2013, Hong Kong, China -- October 12-16, 2013. Proceedings}, interhash = {23d1cf49208d9a0c8b883dc69d4e444d}, intrahash = {2bab3f013052bc741e795c5c61aea5c9}, issn = {1613-0073}, publisher = {CEUR-WS}, title = {Tag Recommendations for SensorFolkSonomies}, url = {http://ceur-ws.org/Vol-1066/}, volume = 1066, year = 2013 } @inproceedings{mueller2013recommendations, abstract = {With the rising popularity of smart mobile devices, sensor data-based applications have become more and more popular. Their users record data during their daily routine or specifically for certain events. The application WideNoise Plus allows users to record sound samples and to annotate them with perceptions and tags. The app is being used to document and map the soundscape all over the world. The procedure of recording, including the assignment of tags, has to be as easy-to-use as possible. We therefore discuss the application of tag recommender algorithms in this particular scenario. We show, that this task is fundamentally different from the well-known tag recommendation problem in folksonomies as users do no longer tag fix resources but rather sensory data and impressions. The scenario requires efficient recommender algorithms that are able to run on the mobile device, since Internet connectivity cannot be assumed to be available. Therefore, we evaluate the performance of several tag recommendation algorithms and discuss their applicability in the mobile sensing use-case.}, author = {Mueller, Juergen and Doerfel, Stephan and Becker, Martin and Hotho, Andreas and Stumme, Gerd}, booktitle = {Recommender Systems and the Social Web Workshop at 7th ACM Conference on Recommender Systems, RecSys 2013, Hong Kong, China -- October 12-16, 2013. Proceedings}, interhash = {23d1cf49208d9a0c8b883dc69d4e444d}, intrahash = {6190d6064dfdb3b8d71f2898539e993e}, note = {accepted for publication}, pages = {New York, NY, USA}, publisher = {ACM}, title = {Tag Recommendations for SensorFolkSonomies}, year = 2013 } @inproceedings{mueller2013recommendations, abstract = {With the rising popularity of smart mobile devices, sensor data-based applications have become more and more popular. Their users record data during their daily routine or specifically for certain events. The application WideNoise Plus allows users to record sound samples and to annotate them with perceptions and tags. The app is being used to document and map the soundscape all over the world. The procedure of recording, including the assignment of tags, has to be as easy-to-use as possible. We therefore discuss the application of tag recommender algorithms in this particular scenario. We show, that this task is fundamentally different from the well-known tag recommendation problem in folksonomies as users do no longer tag fix resources but rather sensory data and impressions. The scenario requires efficient recommender algorithms that are able to run on the mobile device, since Internet connectivity cannot be assumed to be available. Therefore, we evaluate the performance of several tag recommendation algorithms and discuss their applicability in the mobile sensing use-case.}, author = {Mueller, Juergen and Doerfel, Stephan and Becker, Martin and Hotho, Andreas and Stumme, Gerd}, booktitle = {Recommender Systems and the Social Web Workshop at 7th ACM Conference on Recommender Systems, RecSys 2013, Hong Kong, China -- October 12-16, 2013. Proceedings}, interhash = {23d1cf49208d9a0c8b883dc69d4e444d}, intrahash = {6190d6064dfdb3b8d71f2898539e993e}, note = {accepted for publication}, pages = {New York, NY, USA}, publisher = {ACM}, title = {Tag Recommendations for SensorFolkSonomies}, year = 2013 } @article{piatkowski2013spatiotemporal, author = {Piatkowski, Nico and Lee, Sangkyun and Morik, Katharina}, doi = {10.1007/s10994-013-5399-7}, interhash = {314e29a1c444118b8a4e8d2ba7ab6336}, intrahash = {eed8d4fcd9cfc30c01c1bf72e8e9cdbb}, issn = {0885-6125}, journal = {Machine Learning}, language = {English}, number = 1, pages = {115-139}, publisher = {Springer US}, title = {Spatio-temporal random fields: compressible representation and distributed estimation}, url = {http://dx.doi.org/10.1007/s10994-013-5399-7}, volume = 93, year = 2013 } @inproceedings{Keally:2011:PTP:2070942.2070968, abstract = {The vast array of small wireless sensors is a boon to body sensor network applications, especially in the context awareness and activity recognition arena. However, most activity recognition deployments and applications are challenged to provide personal control and practical functionality for everyday use. We argue that activity recognition for mobile devices must meet several goals in order to provide a practical solution: user friendly hardware and software, accurate and efficient classification, and reduced reliance on ground truth. To meet these challenges, we present PBN: Practical Body Networking. Through the unification of TinyOS motes and Android smartphones, we combine the sensing power of on-body wireless sensors with the additional sensing power, computational resources, and user-friendly interface of an Android smartphone. We provide an accurate and efficient classification approach through the use of ensemble learning. We explore the properties of different sensors and sensor data to further improve classification efficiency and reduce reliance on user annotated ground truth. We evaluate our PBN system with multiple subjects over a two week period and demonstrate that the system is easy to use, accurate, and appropriate for mobile devices.}, acmid = {2070968}, address = {New York, NY, USA}, author = {Keally, Matthew and Zhou, Gang and Xing, Guoliang and Wu, Jianxin and Pyles, Andrew}, booktitle = {Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems}, doi = {10.1145/2070942.2070968}, interhash = {5e6a13d34026f65338cfa619054822c8}, intrahash = {61e5e4559d031c4152b3f316c0aa5209}, isbn = {978-1-4503-0718-5}, location = {Seattle, Washington}, numpages = {14}, pages = {246--259}, publisher = {ACM}, series = {SenSys '11}, title = {PBN: towards practical activity recognition using smartphone-based body sensor networks}, url = {http://doi.acm.org/10.1145/2070942.2070968}, year = 2011 } @inproceedings{rezel2010swefe, abstract = {This paper presents SWE-FE: a suite of methods to extend folksonomies to the worldwide Sensor Web in order to tackle the emergent data rich information poor (DRIP) syndrome afflicting most geospatial applications on the Internet. SWE-FE leverages the geospatial information associated with three key components of such collaborative tagging systems: tags, resources and users. Specifically, SWE-FE provides algorithms for: i) suggesting tags for users during the tag input stage; ii) generating tag maps which provides for serendipitous browsing; and iii) personalized searching within the folksonomy. We implement SWE-FE on the GeoCENS Sensor Web platform as a case study for assessing the efficacy of our methods. We outline the evaluation framework that we are currently employing to carry out this assessment.}, author = {Rezel, R. and Liang, S.}, booktitle = {2010 International Symposium on Collaborative Technologies and Systems (CTS)}, doi = {10.1109/CTS.2010.5478494}, interhash = {9eb696593932c517873232386f8f61bf}, intrahash = {d5b71572c7fea6504a0c0a3d84a9ecf0}, month = may, pages = {349--356}, publisher = {IEEE}, title = {SWE-FE: Extending folksonomies to the Sensor Web}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5478494}, year = 2010 } @inproceedings{rezel2010swefe, abstract = {This paper presents SWE-FE: a suite of methods to extend folksonomies to the worldwide Sensor Web in order to tackle the emergent data rich information poor (DRIP) syndrome afflicting most geospatial applications on the Internet. SWE-FE leverages the geospatial information associated with three key components of such collaborative tagging systems: tags, resources and users. Specifically, SWE-FE provides algorithms for: i) suggesting tags for users during the tag input stage; ii) generating tag maps which provides for serendipitous browsing; and iii) personalized searching within the folksonomy. We implement SWE-FE on the GeoCENS Sensor Web platform as a case study for assessing the efficacy of our methods. We outline the evaluation framework that we are currently employing to carry out this assessment.}, author = {Rezel, R. and Liang, S.}, booktitle = {2010 International Symposium on Collaborative Technologies and Systems (CTS)}, doi = {10.1109/CTS.2010.5478494}, interhash = {9eb696593932c517873232386f8f61bf}, intrahash = {d5b71572c7fea6504a0c0a3d84a9ecf0}, month = may, pages = {349--356}, publisher = {IEEE}, title = {SWE-FE: Extending folksonomies to the Sensor Web}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5478494}, year = 2010 } @article{michel2008wireless, abstract = {The actual paper introduces a concept for localization of mobile nodes in a wireless sensor network. The realized algorithms are characterized by minimal complexity and high robustness even in networks with scarce resources. The implementation on simple, low-power embedded systems is possible without difficulty. An application of the concept for vehicle tracking illustrates the very good performance of the approach.}, author = {Michel, J. C. Fuentes and Vossiek, M.}, doi = {10.1007/s00502-008-0573-5}, interhash = {b408d095e9f113e715c714e854554881}, intrahash = {b6d8a6f68c7faf559a1a47051dacb0aa}, issn = {0932-383X}, journal = {E & I Elektrotechnik und Informationstechnik}, number = 10, pages = {341--346}, publisher = {Springer}, title = {Wireless sensor network approach for robust localization of mobile nodes with minimal complexity}, url = {http://dx.doi.org/10.1007/s00502-008-0573-5}, volume = 125, year = 2008 } @inproceedings{srinivasan2008protecting, abstract = {In this paper, we first present a new privacy leak in residential wireless ubiquitous computing systems, and then we propose guidelines for designing future systems to prevent this problem. We show that we can observe private activities in the home such as cooking, showering, toileting, and sleeping by eavesdropping on the wireless transmissions of sensors in a home, even when all of the transmissions are encrypted. We call this the Fingerprint and Timing-based Snooping (FATS) attack. This attack can already be carried out on millions of homes today, and may become more important as ubiquitous computing environments such as smart homes and assisted living facilities become more prevalent. In this paper, we demonstrate and evaluate the FATS attack on eight different homes containing wireless sensors. We also propose and evaluate a set of privacy preserving design guidelines for future wireless ubiquitous systems and show how these guidelines can be used in a hybrid fashion to prevent against the FATS attack with low implementation costs.}, address = {New York, NY, USA}, author = {Srinivasan, Vijay and Stankovic, John and Whitehouse, Kamin}, booktitle = {UbiComp '08: Proceedings of the 10th international conference on Ubiquitous computing}, doi = {10.1145/1409635.1409663}, interhash = {493934da14b0afdda73bdb91c145351c}, intrahash = {0efc5c0ef9a17c35402c654ff76247b0}, isbn = {978-1-60558-136-1}, location = {Seoul, Korea}, pages = {202--211}, publisher = {ACM}, title = {Protecting your daily in-home activity information from a wireless snooping attack}, url = {http://portal.acm.org/citation.cfm?id=1409663}, year = 2008 } @article{andr2005measuring, abstract = {This publication explores the degree of accuracy to which the propagation delay of WLAN packets can be measured using today’s commercial, inexpensive equipment. The aim is to determine the distance between two wireless nodes for location sensing applications. We conducted experiments in which we measured the time difference between sending a data packet and receiving the corresponding immediate acknowledgement. We found the propagation delays correlate closely with distance, having only a measurement error of a few meters. Furthermore, they are more precise than received signal strength indications. To overcome the low time resolution of the given hardware timers, various statistical methods are applied, developed and analyzed. For example, we take advantage of drifting clocks to determine propagation delays that are forty times smaller than the clocks’ quantization resolution. Our approach also determines the frequency offset between remote and local crystal clocks. ER -}, author = {Günther, André and Hoene, Christian}, interhash = {9c2567a32488c5b74fa92197cffd97eb}, intrahash = {ba15c6fcd227670705635293a4cf7206}, journal = {NETWORKING 2005}, pages = {768--779}, title = {Measuring Round Trip Times to Determine the Distance Between WLAN Nodes}, url = {http://dx.doi.org/10.1007/11422778_62}, year = 2005 } @inproceedings{breslin2009integrating, abstract = {Sensors have begun to infiltrate people's everyday lives. They can provide information about a car's condition, can enable smart buildings, and are being used in various mobile applications, to name a few. Generally, sensors provide information about various aspects of the real world. Online social networks, another emerging trend over the past six or seven years, can provide insights into the communication links and patterns between people. They have enabled novel developments in communications as well as transforming the Web from a technical infrastructure to a social platform, very much along the lines of the original Web as proposed by Tim Berners-Lee, which is now often referred to as the Social Web. In this position paper, we highlight some of the interesting research areas where sensors and social networks can fruitfully interface, from sensors providing contextual information in context-aware and personalized social applications, to using social networks as "storage infrastructures" for sensor information.}, author = {Breslin, John G. and Decker, Stefan and Hauswirth, Manfred and Hynes, Gearoid and Phuoc, Danh Le and Passant, Alexandre and Polleres, Axel and Rabsch, Cornelius and Reynolds, Vinny}, booktitle = {Proceedings on the W3C Workshop on the Future of Social Networking}, interhash = {8a9846d06fcb3d48e5f081801a957565}, intrahash = {e5286c49f4a49bb8752d473f126824dd}, title = {Integrating Social Networks and Sensor Networks}, url = {http://www.w3.org/2008/09/msnws/papers/sensors.html}, year = 2009 } @inproceedings{breslin2009integrating, abstract = {Sensors have begun to infiltrate people's everyday lives. They can provide information about a car's condition, can enable smart buildings, and are being used in various mobile applications, to name a few. Generally, sensors provide information about various aspects of the real world. Online social networks, another emerging trend over the past six or seven years, can provide insights into the communication links and patterns between people. They have enabled novel developments in communications as well as transforming the Web from a technical infrastructure to a social platform, very much along the lines of the original Web as proposed by Tim Berners-Lee, which is now often referred to as the Social Web. In this position paper, we highlight some of the interesting research areas where sensors and social networks can fruitfully interface, from sensors providing contextual information in context-aware and personalized social applications, to using social networks as "storage infrastructures" for sensor information.}, author = {Breslin, John G. and Decker, Stefan and Hauswirth, Manfred and Hynes, Gearoid and Phuoc, Danh Le and Passant, Alexandre and Polleres, Axel and Rabsch, Cornelius and Reynolds, Vinny}, booktitle = {Proceedings on the W3C Workshop on the Future of Social Networking}, interhash = {8a9846d06fcb3d48e5f081801a957565}, intrahash = {e5286c49f4a49bb8752d473f126824dd}, title = {Integrating Social Networks and Sensor Networks}, url = {http://www.w3.org/2008/09/msnws/papers/sensors.html}, year = 2009 } @article{eckert2009complex, abstract = {Ereignisgesteuerte Informationssysteme benötigen eine systematische und automatische Verarbeitung von Ereignissen. Complex Event Processing (CEP) ist ein Sammelbegriff für Methoden, Techniken und Werkzeuge, um Ereignisse zu verarbeiten während sie passieren, also kontinuierlich und zeitnah. CEP leitet aus Ereignissen höheres, wertvolles Wissen in Form von sog. komplexen Ereignissen, d.h. Situationen die sich nur als Kombination mehrerer Ereignisse erkennen lassen, ab. }, author = {Eckert, Michael and Bry, Fran\c{c}ois}, interhash = {b924eac11a08860c330534fccc19c339}, intrahash = {55c6ab2d22435448aed365d482c2a0c4}, journal = {Informatik Spektrum}, number = 2, pages = {163--167}, title = {Aktuelles Schlagwort: Complex Event Processing (CEP)}, url = {http://www.pms.ifi.lmu.de/publikationen/#PMS-FB-2009-5}, volume = 32, year = 2009 } @techreport{eckert2009complex, abstract = {Event-driven information systems demand a systematic and automatic processing of events. Complex Event Processing (CEP) encompasses methods, techniques, and tools for processing events while they occur, i.e., in a continuous and timely fashion. CEP derives valuable higher-level knowledge from lower-level events; this knowledge takes the form of so called complex events, that is, situations that can only be recognized as a combination of several events.}, author = {Eckert, Michael and Bry, Fran\c{c}ois}, institution = {Institute for Informatics, University of Munich}, interhash = {4a53418d11e5b0dae12a23d0a74d2184}, intrahash = {af5a0f81a025c87358f58cb799c1f92c}, number = {PMS-FB-2009-6}, title = {Complex Event Processing (CEP)}, type = {{research report, PMS-FB-2009-6}}, url = {http://www.pms.ifi.lmu.de/publikationen/#PMS-FB-2009-6}, year = 2009 } @article{michael2007citizens, abstract = {In recent months there has been an explosion of interest in using the Web to create, assemble, and disseminate geographic information provided voluntarily by individuals. Sites such as Wikimapia and OpenStreetMap are empowering citizens to createa global patchwork of geographic information, while Google Earth and other virtual globes are encouraging volunteers to developinteresting applications using their own data. I review this phenomenon, and examine associated issues: what drives peopleto do this, how accurate are the results, will they threaten individual privacy, and how can they augment more conventionalsources? I compare this new phenomenon to more traditional citizen science and the role of the amateur in geographic observation.}, author = {Goodchild, Michael}, doi = {10.1007/s10708-007-9111-y}, interhash = {5b22a56fff9318036a29a21923c59678}, intrahash = {c35939fb7621bf75eebd4ed62febeb39}, issn = {0343-2521}, journal = {GeoJournal}, month = aug, number = 4, pages = {211--221}, title = {Citizens as sensors: the world of volunteered geography}, url = {http://www.springerlink.com/content/h013jk125081j628/}, volume = 69, year = 2007 }