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Karl Aberer

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Related publications (297)

Autonomic SLA-driven Provisioning for Cloud Applications

Significant achievements have been made for automated allocation of cloud resources. However, the performance of applications may be poor in peak load periods, unless their cloud resources are dynamically adjusted. Moreover, although cloud resources dedica ...

2011

What have fruits to do with technology? The case of Orange, Blackberry and Apple

Karl Aberer, Surender Reddy Yerva, Zoltán Miklós

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

ACM2011

Creating Probabilistic Databases from Imprecise Time-Series Data

Karl Aberer, Saket Sathe, Ho Young Jeung

Although efficient processing of probabilistic databases is a well-established field, a wide range of applications are still unable to benefit from these techniques due to the lack of means for creating probabilistic databases. In fact, it is a challenging ...

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

Building a Front End for a Sensor Data Cloud

Karl Aberer, Ian Rolewicz, Zoltán Miklós, Ho Young Jeung, Michele Catasta

This document introduces the TimeCloud Front End, a web-based interface for the TimeCloud platform that manages large-scale time series in the cloud. While the Back End is built upon scalable, fault-tolerant distributed systems as Hadoop and HBase and take ...

Springer Berlin / Heidelberg2011

Tracking Hot-k Items over Web 2.0 Streams

Karl Aberer, Parisa Haghani, Sebastian Michel

The rise of the Web 2.0 has made content publishing easier than ever. Yesterday’s passive consumers are now active users who generate and contribute new data to the web at an immense rate. We consider evaluating data driven aggregation queries which arise ...

2011

Cost-efficient and Differentiated Data Availability Guarantees in Data Clouds

Nicolas Bonvin, Karl Aberer

Failures of any type are common in current datacenters. As data scales up, its availability becomes more complex, while different availability levels per application or per data item may be required. In this paper, we propose a self- managed key-value stor ...

IEEE2010

The gist of everything new: personalized top-k processing over web 2.0 streams

Karl Aberer, Parisa Haghani, Sebastian Michel

Web 2.0 portals have made content generation easier than ever with millions of users contributing news stories in form of posts in weblogs or short textual snippets as in Twitter. Efficient and effective filtering solutions are key to allow users stay tune ...

ACM2010

Effective Metadata Management in Federated Sensor Networks

Karl Aberer, Sofiane Sarni, Michael Lehning, Saket Sathe, Ho Young Jeung, Ioannis Paparrizos

As the Sensor Internet starts to become reality, increasingly heterogeneous sensor networks are becoming interconnected into federated sensor networks and provide huge volumes of sensor data for a variety of applications to large user communities, such as ...

2010

Tunable Privacy for Access Controlled Data in Peer-to-Peer Systems

Karl Aberer, Zoltán Miklós

Peer-to-peer paradigm is increasingly employed for organizing distributed resources for various applications, e.g. content distribution, open storage grid etc. In open environments, even when proper access control mechanisms supervise the access to the res ...

2010

Structured Overlay For Heterogeneous Environments: Design and Evaluation of Oscar

Karl Aberer, Anwitaman Datta, Sarunas Girdzijauskas

Recent years have seen advances in building large internet-scale index structures, generally known as structured overlays. Early structured overlays realized distributed hash tables (DHTs) which are ill suited for anything but exact queries. The need to su ...

2010

A self-organized, fault-tolerant and scalable replication scheme for cloud storage

Nicolas Bonvin, Karl Aberer

Failures of any type are common in current datacenters, partly due to the higher scales of the data stored. As data scales up, its availability becomes more complex, while different availability levels per application or per data item may be required. In t ...

ACM2010

An economic approach for scalable and highly-available distributed applications

Nicolas Bonvin, Karl Aberer

Service-oriented architecture (SOA) paradigm for orchestrating large-scale distributed applications offers significant cost savings by reusing existing services. However, the high irregularity of client requests and the distributed nature of the approach m ...

2010

OpenSense: open community driven sensing of environment

Boi Faltings, Alcherio Martinoli, Karl Aberer, Guillermo Barrenetxea Kobas, Saket Sathe, Dipanjan Chakraborty

This paper outlines a vision for community-driven sensing of our environment. At its core, community sensing is a dynamic new form of mobile geosensor network. We believe that community sensing networks, in order to be widely deployable and sustainable, ne ...

ACM2010

Impact of Trust Management and Information Sharing to Adversarial Cost in Ranking Systems

Karl Aberer

Ranking systems such as those in product review sites and recommender systems usually use ratings to rank favorite items based on both their quality and popularity. Since higher ranked items are more likely selected and yield more revenues for their owners ...

2010

Privacy-aware and highly-available OSN profiles

Karl Aberer, Rammohan Narendula

The explosive growth of online social networks (OSNs) and their wide popularity suggest the impact of OSNs on today's Internet. At the same time, concentration of vast amount of personal information within a single administrative domain causes critical pri ...

2010

Continuous Query Evaluation over Distributed Sensor Networks

Karl Aberer, Alexandre Herrmann, Oana Anca Jurca, Sebastian Michel

In this paper we address the problem of processing continuous multi-join queries, over distributed data streams. Our approach makes use of existing work in the field of publish/subscribe systems. We show how these principles can be ported to our envisioned ...

IEEE2010

Towards better entity resolution techniques for Web document collections

Karl Aberer, Surender Reddy Yerva, Zoltán Miklós

As person names are non-unique, the same name on different Web pages might or might not refer to the same real-world person. This entity identification problem is one of the most challenging issues in realizing the Semantic Web or entity-oriented search. W ...

IEEE2010

Outtweeting the Twitterers - Predicting Information Cascades in Microblogs

Zoran Despotovic, Karl Aberer, Wojciech Galuba, Dipanjan Chakraborty

Microblogging sites are a unique and dynamic Web 2.0 communication medium. Understanding the information flow in these systems can not only provide better insights into the underlying sociology, but is also crucial for applications such as content ranking, ...

2010

Automatic Construction and Multi-level Visualization of Semantic Trajectories

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

With the prevalence of GPS-embedded mobile devices, enormous amounts of mobility data are being collected in the form of trajectory - a stream of (x,y,t) points. Such trajectories are of heterogeneous entities - vehicles, people, animals, parcels etc. Most ...

2010

Castor: Scalable Secure Routing for Ad Hoc Networks

Zoran Despotovic, Karl Aberer, Wojciech Galuba, Marcin Poturalski, Panagiotis Papadimitratos

Wireless ad hoc networks are inherently vulnerable, as any node can disrupt the communication of potentially any other node in the network. Many solutions to this problem have been proposed. In this paper, we take a fresh and comprehensive approach that ad ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

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