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Karl Aberer

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Publications associées (297)

An Adaptive Approach for Online Segmentation of Multi-Dimensional Mobile Data

Karl Aberer, Zhixian Yan, Tian Guo

With increasing availability of mobile sensing devices including smartphones, online mobile data segmentation becomes an important topic in reconstructing and understanding mobile data. Traditional approaches like online time series segmentation either use ...

2012

Energy-Efficient Continuous Activity Recognition on Mobile Phones: An Activity-Adaptive Approach

Karl Aberer, Zhixian Yan, Dipanjan Chakraborty

Power consumption on mobile phones is a painful obstacle towards adoption of continuous sensing driven applications, e.g., continuously inferring individual’s locomotive activities (such as ‘sit’, ‘stand’ or ‘walk’) using the embedded accelerometer sensor. ...

Ieee2012

Mining Complex Activities in the Wild via a Single Smartphone Accelerometer

Karl Aberer, Zhixian Yan, Dipanjan Chakraborty, Tri Kurniawan Wijaya, Angshu Rai

Complex activities are activities that are a combination of many simple ones. Typically, activities of daily living (ADLs) fall in this category. Complex activity recognition is an active area of interest amongst sensing and knowledge mining community toda ...

ACM2012

Entity-based Classification of Twitter Messages

Karl Aberer, Surender Reddy Yerva, Zoltán Miklós

Twitter is a popular micro-blogging service on theWeb, where people can enter short messages, which then become visible to some other users of the service. While the topics of these messages varies, there are a lot of messages where the users express their ...

2012

TweetSpector: Entity-based retrieval of Tweets

Karl Aberer, Surender Reddy Yerva, Zoltán Miklós, Flavia Adelina Grosan, Alexandru Octavian Tandrau

People readily express their opinions about the various products, companies, TV shows etc., on Twitter. These tweet messages are thus a rich source of information that can be exploited to understand the sentiments about the concerned products or services. ...

2012

Efficient monitoring of personalized hot news over Web 2.0 streams

Karl Aberer, Parisa Haghani, Sebastian Michel

Web 2.0 streams, like blog postings, microblogging tweets, or RSS feeds from online communities, offer a wealth of latest news about real-world events and societal discussion. From a user’s perspective, it becomes harder and harder to get a decent overview ...

2012

Semantic Place Prediction using Mobile Data

Karl Aberer, Abson Sae-Tang, Michele Catasta, Lucas Kelsey McDowell

2012

Towards a global participatory platform Democratising open data, complexity science and collective intelligence

Karl Aberer

The FuturICT project seeks to use the power of big data, analytic models grounded in complexity science, and the collective intelligence they yield for societal benefit. Accordingly, this paper argues that these new tools should not remain the preserve of ...

Springer Verlag2012

Automated Model-driven Simulation and Visualization of Field Sensor Data

Karl Aberer, Sofiane Sarni, Marc Parlange, Michael Lehning, Silvia Simoni, Mathias Thierry Pierre Bavay

In the EU project Hydrosys (http://www.hydrosysonline.eu), we have defined and implemented a data processing pipeline that makes simulation process completely automated, fast and transparent to the scientist. Furthermore, our automated simulation tool is f ...

2011

Semantic Sensor Data Search in a Large-Scale Federated Sensor Network

Karl Aberer, Jean Paul Calbimonte Perez, Ho Young Jeung

Sensor network deployments are a primary source of massive amounts of data about the real world that surrounds us, measuring a wide range of physical properties in real time. However, in large-scale deployments it becomes hard to eectively exploit the data ...

CEUR-WS2011

SeMiTri: A Framework for Semantic Annotation of Heterogeneous Trajectories

Stefano Spaccapietra, Christine Parent, Karl Aberer, Zhixian Yan, Dipanjan Chakraborty

GPS devices allow recording the movement track of the moving object they are attached to. This data typically consists of a stream of spatio-temporal (x,y,t) points. For application purposes the stream is transformed into finite subsequences called {\em tr ...

ACM2011

Fuzzynet: Ringless Routing in a Ring-like Structured Overlay

Karl Aberer, Anwitaman Datta, Sarunas Girdzijauskas, Wojciech Galuba

Many structured overlay networks rely on a ring invariant as a core network connectivity element. The responsibility ranges of the participating peers and navigability principles (greedy routing) heavily depend on the ring structure. For correctness guaran ...

2011

Advanced Search, Visualization and Tagging of Sensor Metadata

Karl Aberer, Ho Young Jeung, Ioannis Paparrizos

As sensors continue to proliferate, the capabilities of effectively querying not only sensor data but also its metadata becomes important in a wide range of applications. This paper demonstrates a search system that utilizes various techniques and tools fo ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Analyzing the Emergence of Semantic Agreement among Rational Agents

Karl Aberer, Zoltán Miklós

Todays complex online applications often require the interaction of multiple services that potentially belong to different business entities. Interoperability is a core element of such an environment, yet not a straightforward one. In this paper, we argue ...

IEEE Computer Society2011

Distributed processing of continuous sliding-window k-NN queries for data stream filtering

Karl Aberer, Ivana Podnar, Kresimir Pripuzic

A sliding-window k-NN query (k-NN/w query) continuously monitors incoming data stream objects within a sliding window to identify k closest objects to a query. It enables effective filtering of data objects streaming in at high rates from potentially distr ...

Springer Verlag2011

Effective Usage of Computational Trust Models in Rational Environments

Karl Aberer, Hung Le Vu

Computational reputation-based trust models using statistical learning have been intensively studied for distributed systems where peers behave maliciously. However practical applications of such models in environments with both malicious and rational beha ...

2011

My3: A highly-available P2P-based online social network

Karl Aberer, Rammohan Narendula

As the online social networks (OSNs), such as Facebook, witness explosive growth, the privacy challenges gain critical consideration from governmental and law agencies due to concentration of vast amount of personal information within a single administrati ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Efficient Interest Group Discovery in Social Networks using an Integrated Structure/Quality Index

Karl Aberer, Adriana Budura, Sebastian Michel

2011

Efficiently Maintaining Distributed Model-Based Views on Real-Time Data Streams

Karl Aberer, Petre Alexandru Arion, Ho Young Jeung

Minimizing communication cost is a fundamental problem in large-scale federated sensor networks. Maintaining model-based views of data streams has been highlighted because it permits efficient data communication by transmitting parameter values of models, ...

IEEE2011

Towards Online Multi-Model Approximation of Time Series

Karl Aberer, Mehdi Riahi

The increasing use of sensor technology for various monitoring applications (e.g. air-pollution, traffic, climate-change, etc.) has led to an unprecedented volume of streaming data that has to be efficiently stored and retrieved. Real-time model-based data ...

IEEE Computer Society2011

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