Publications by Karl Aberer | EPFL Graph Search

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Schema matching is the process of establishing correspondences between the attributes of database schemas for data integration purpose. Although several schema matching tools have been developed, their results are often incomplete or erroneous. To obtain c ...

Trust and reputation systems have proven to be essential to enforcing cooperative behavior in peer-to-peer networks. We briefly describe the current approaches to building reputation systems: social networks formation, probabilistic estimation and game the ...

Given a schema and a set of concepts, representative of entities in the domain of discourse, schema cover deﬁnes correspondences between concepts and parts of the schema. Schema cover aims at interpreting the schema in terms of concepts and thus, vastly si ...

The correct functioning of a peer-to-peer network relies on cooperative behavior of peers as service providers. Current approaches to detection and deterrence of non-cooperative behavior, such as reputation systems, rely on (1) global sharing of observatio ...

As the number of schema repositories grows rapidly and several web-based platforms exist to support publishing schemas, \emph{schema reuse} becomes a new trend. Schema reuse is a methodology that allows users to create new schemas by copying and adapting e ...

This paper describes our Gnutella compatible P2P system Gridella which is based on the P-Grid approach. P-Grid has several advantages over the standard Gnutella infrastructure, for example, that probabilistic estimates can be given for successful search requests and that it scales gracefully in the total number of nodes and data items. Gridella is designed for interoperability with Gnutella and the long-term goal is to replace the existing Gnutella infrastructure with Gridella to make it more self-organizin

The proliferation of digital camera devices (stand-alone or combined with cell phones), new protocols such as MMS and the desire of people to com-municate and share their experience call for new systems to support these needs in new Internet-scale infrastructures. In this paper we outline our plans for an Internet-scale P2P system that enables users to share (globally or only within a group) and efficiently locate photographs based on semi-automatically provided meta-information (by the devices and the user

Problem diagnosis for distributed systems is usually difficult. Thus, an automated support is needed to identify root causes of encountered problems such as performance lags or inadequate functioning quickly. The many tools and techniques existing today th ...

The continuous growth of energy needs and the fact that unpredictable energy demand is mostly served by unsustainable (i.e. fossil-fuel) power generators have given rise to the development of Demand Response (DR) mechanisms for flattening energy demand. Bu ...

The participatory sensing paradigm, through the growing availability of cheap sensors in mobile devices, enables applications of great social and business interest, e.g., electrosmog exposure measurement and early earthquake detection. However, users' priv ...

Directory services are a genuine constituent of any distributed architecture which facilitate binding attributes to names and then querying this information, that is, announcing and discovering resources. In such contexts, especially in a business environm ...

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 ...

Due to the abundance of attractive services available on the cloud, people are placing an increasing amount of their data online on different cloud platforms. However, given the recent large-scale attacks on users data, privacy has become an important issu ...

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 ...

Query-load (forwarding and answering) balancing in structured overlays is one of the most critical and least studied problems. It has been assumed that caching heuristics can take care of it. We expose that caching, while necessary, is not in itself suffic ...

Managing trust is a problem of particular importance in peer-to-peer environments as one encounters frequently unknown agents. Existing methods for trust management based on reputation do however not scale as they rely on some form of central database or global knowledge to be maintained at each agent. In this paper we illustrate that the problem needs to be addressed at both the data management and the semantic, i.e. trust management, level and we devise a method of how trust assessments can be performed b

In Web-based information commerce it is diffcult to disentangle presentation from process logic, and sometimes even data is not separate from the presentation. Consequently, it becomes crucial to define an abstract model for business processes and their ma ...

Automatically extracting information from social media is challenging given that social content is often noisy, ambiguous, and inconsistent. However, as many stories break on social channels first before being picked up by mainstream media, developing meth ...

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 ...

Karl Aberer

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Collaborative Schema Matching Reconciliation

The Complex Facets of Reputation and Trust

Completeness and Ambiguity of Schema Cover

Authentication-free fault-tolerant peer-to-peer service provisioning

Privacy-Preserving Schema Reuse

Gridella: A self-organizing P2P system

PIX-Grid: A Platform for P2P photo exchange

Mapping Moving Landscapes by Mining Mountains of Logs: Novel Techniques for Dependency Model Generation

Sustainable Energy Consumption Monitoring in Residential Settings

User-side adaptive protection of location privacy in participatory sensing

A Search Engine for QoS-enabled Discovery of Semantic Web Services

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

C3P: Context-Aware Crowdsourced Cloud Privacy

OpenSense: open community driven sensing of environment

Query-load balancing in structured overlays

Managing Trust in a Peer-2-Peer Information System

Separating Business Process from User Interaction in Web-Based Information Commerce

Preface-Special Issue on Misinformation on the Web

Efficient Document Filtering Using Vector Space Topic Expansion and Pattern-Mining: The Case of Event Detection in Microposts

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