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Karl Aberer

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Related publications (297)

Page 8 of 15

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

Karl Aberer, Zoltán Miklós, Surender Reddy Yerva

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

Synergies of different reputation systems: challenges and opportunities

Karl Aberer

Reputation is a well established means to determine trustworthiness in online systems in various contexts, e.g. online transactions, product recommendation, e-mail spam fighting, etc. However, typically these reputation systems are "closed" outside of the ...

IEEE Computer Society2009

OptiMoS: Optimal Sensing for Mobile Sensors

Karl Aberer, Zhixian Yan, Julien Eberle

Both sensor coverage maximization and energy cost minimization are the fundamental requirements in the design of real-life mobile sensing applications, e.g., (1) deploying environ- mental sensors (like CO2, fine particle measurement) on public transports t ...

2012

MoZuMa: A Model Zoo for Multimedia Applications

Stéphane Remo Massonnet, Niels Jens Poulsen, Marco Romanelli, Karl Aberer, Rémi Philippe Lebret

Lots of machine learning models with applications in Multimedia Search are released as Open Source Software. However, integrating these models into an application is not always an easy task due to the lack of a consistent interface to run, train or distrib ...

Assoc Computing Machinery2022

Improving the Throughput of Distributed Hash Tables Using Congestion-Aware Routing

Karl Aberer, Jean-Yves Le Boudec, Dejan Kostic, Fabius Klemm

Advanced applications for Distributed Hash Tables (DHTs), such as Peer-to-Peer Information Retrieval, require a DHT to quickly and efficiently process a large number (in the order of millions) of requests. In this paper we study mechanisms to optimize the ...

2007

Scalia: An Adaptive Scheme for Efficient Multi-Cloud Storage

Karl Aberer, Nicolas Bonvin

A growing amount of data is produced daily resulting in a growing demand for storage solutions. While cloud storage providers offer a virtually infinite storage capacity, data owners seek geographical and provider diversity in data placement, in order to a ...

2012

Predicting the Success of Online Petitions Leveraging Multidimensional Time-Series

Karl Aberer, Philippe Cudré-Mauroux, Julia Proskurnia

Applying classical time-series analysis techniques to online content is challenging, as web data tends to have data quality issues and is often incomplete, noisy, or poorly aligned. In this paper, we tackle the problem of predicting the evolution of a time ...

TweetSpector: Entity-based retrieval of Tweets

Karl Aberer, Zoltán Miklós, Surender Reddy Yerva, 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

To Tag or Not to Tag ? Harvesting Adjacent Metadata in Large-Scale Tagging Systems

Karl Aberer, Philippe Cudré-Mauroux, Sebastian Michel, Adriana Budura

We present HAMLET, a suite of principles, scoring models and algorithms to automatically propagate metadata along edges in a document neighborhood. As a showcase scenario we consider tag prediction in community-based Web 2.0 tagging applications. Experimen ...

ACM2008

Aggregation of a Term Vocabulary for Peer-to-Peer Information Retrieval: a DHT Stress Test

Karl Aberer, Fabius Klemm

There has been an increasing research interest in developing full-text retrieval based on peer-to-peer (P2P) technology. So far, these research efforts have largely concentrated on efficiently distributing an index. However, ranking of the results retrieve ...

2005

Studying Web Content Credibility by Social Simulation

Karl Aberer

The Internet has become an important source of information that significantly affects social, economical and political life. The content available in the Web is the basis for the operation of the digital economy. Moreover, Web content has become essential ...

University of Surrey, Department of Sociology2014

Advanced Search, Visualization and Tagging of Sensor Metadata

Karl Aberer, Ho Young Jeung

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

Toward Self-monitoring Smart Cities: the OpenSense2 Approach

Karl Aberer, Jean Paul Calbimonte Perez, Julien Eberle

2017

Evaluating Top-k Queries over Incomplete Data Streams

Karl Aberer, Sebastian Michel, Parisa Haghani

We study the problem of continuous monitoring of top-k queries over multiple non-synchronized streams. Assuming a sliding window model, this general problem has been a well addressed research topic in recent years. However, most approaches assume the strea ...

2009

An Evaluation of Diversification Techniques

Karl Aberer, Quoc Viet Hung Nguyen, Thành Tâm Nguyên

Diversification is a method of improving user satisfaction by increasing the variety of information shown to user. Due to the lack of a precise definition of information variety, many diversification techniques have been proposed. These techniques, however ...

Springer2015

An Economic Analysis of Pervasive, Incentive-Based Demand Response

Karl Aberer, Matteo Vasirani, Tri Kurniawan Wijaya

Demand response (DR) emerges as one of the cheapest and greenest solutions to match supply and demand in the electricity sector. While DR has been focused on large and industrial consumers, pervasive implementation (by including residential consumers) is n ...

2015

A Multiagent System for Dynamic Data Aggregation in Medical Research

Karl Aberer, Michael Ignaz Schumacher, Alevtina Dubovitskaya

The collection of medical data for research purposes is a challenging and long-lasting process. In an effort to accelerate and facilitate this process we propose a new framework for dynamic aggregation of medical data from distributed sources. We use agent ...

Hindawi Publishing Corporation2016

Comparing Events Coverage in Online News and Social Media: The Case of Climate Change

Karl Aberer, Alexandra Olteanu

Social media is becoming more and more integrated in the distribution and consumption of news. How is news in social media different from mainstream news? % This paper presents a comparative analysis covering a span of 17 months and hundreds of news events ...

2015

Argument discovery via crowdsourcing

Karl Aberer, Quoc Viet Hung Nguyen, Thành Tâm Nguyên, Chi Thang Duong

The amount of controversial issues being discussed on the Web has been growing dramatically. In articles, blogs, and wikis, people express their points of view in the form of arguments, i.e., claims that are supported by evidence. Discovery of arguments ha ...

Springer Verlag2017

Fast-FedUL: A Training-Free Federated Unlearning with Provable Skew Resilience

Karl Aberer, Thanh Trung Huynh

Federated learning (FL) has recently emerged as a compelling machine learning paradigm, prioritizing the protection of privacy for training data. The increasing demand to address issues such as "the right to be forgotten" and combat data poisoning attacks ...

Springer Nature2024