Papers by Klaus Meyer-Wegener
Das Werk einschIieBlich aller seiner Teile ist urheberrechtIich geschiitzt. Jede Verwertung auBer... more Das Werk einschIieBlich aller seiner Teile ist urheberrechtIich geschiitzt. Jede Verwertung auBerhalb der engen Grenzen des Urheberrechtsgesetzes ist ohne Zustimmung des Verlages unzulassig und strafbar. Das gilt besonders fiir Vervielfiiltigungen, Ubersetzungen, Mikroverfilmungen und die Einspeicherung und Verarbeitung in elektronischen Systemen.
Inform. Forsch. Entwickl., 2003
BTW Workshops, 2015
Traditional tracking of bats uses telemetry [ADMW09]. This is very laborious for the biologists: ... more Traditional tracking of bats uses telemetry [ADMW09]. This is very laborious for the biologists: At least twoo ft hem must run through the forest to get ag ood triangulation. And, only one bat at atime can be tracked with this method.
Informatik, Aug 1, 2003
Zusammenfassung. Die DFG-Forschergruppe 428 COMQUAD an der TU Dresden hat zum 1. Oktober 2001 die... more Zusammenfassung. Die DFG-Forschergruppe 428 COMQUAD an der TU Dresden hat zum 1. Oktober 2001 die Arbeit aufgenommen. Sie befasst sich mit nichtfunktionalen Eigenschaften von komponentenbasierten Software-Systemen, insbesondere mit zusagbaren quantitativen Eigenschaften, Adaptionsfähigkeit und Sicherheit. Dieser Beitrag beschreibt die Ziele der Forschergruppe und die geplante Vorgehensweise.
Today's generation of sensor networks reflect several changes in system characteristics over trad... more Today's generation of sensor networks reflect several changes in system characteristics over traditional sensor networks. These changes affect three key aspects: energy as a fundamental resource, stream data processing, and the inherently dynamic structure of the overall system. In this paper we extract and present eight distinct challenges aligned to the key aspects which need to be addressed in the future. We use data of ongoing science and research projects to extract the most important challenges. These challenges need to be tackled in order to provide the basis for a flexible and adaptive system design which supports data-stream processing in energy-constrained adhoc networks.
The ability to adapt to different computing environments or external changes is an important requ... more The ability to adapt to different computing environments or external changes is an important requirement for both stationary and mobile computing. Without this ability, all requirements have to be foreseen, which is often not possible in practice. Classical software engineering approaches often lead to redeployment or even software migration. Therefore loosely coupled software design and a dynamic adaptation model are required. Dynamic aspect-oriented programming (d-AOP) in conjunction with service oriented programming is well suited to face this demand. One well known approach providing a service-oriented component model is the OSGi Service Platform. This paper introduces our approach to combine an OSGi Framework with d-AOP to establish dynamic adaptation
Die Semantik von Datenstromsystemen (DSS) ist bislang nicht standardisiert. Für Anwendungsentwick... more Die Semantik von Datenstromsystemen (DSS) ist bislang nicht standardisiert. Für Anwendungsentwickler ist es jedoch wichtig zu wissen, wie sich ein bestimmtes System in einer bestimmten Situation verhält. Ebenso bedeutsam ist das Verhalten für föderierte Datenstromsysteme, die Anfragen automatisch auf verschiedene DSS verteilen. Als Hilfsmittel zur Beschreibung können semantische Modelle dienen. Diese werden parametrisiert und können durch verschiedene Parameterwerte das Verhalten verschiedener Systeme nachbilden. Da bisher auch kein allgemein anerkanntes Modell zur Beschreibung von DSS existiert, muss man sich möglicherweise mit verschiedenen Modellen auseinandersetzen. Daher wäre es hilfreich, die Bestimmung der jeweiligen Parameterwerte weitgehend zu automatisieren, wozu dieser Beitrag eine geeignete Evaluationsumgebung vorstellt. Diese vergleicht die Ausgaben eines DSS mit allen Vorhersagen, die ein Modell für verschiedene Parameter machen kann. Stimmen die Ergebnisse überein, si...
Ground nodes receive the signals transmitted by the mobile nodes. They are also sensor nodes that... more Ground nodes receive the signals transmitted by the mobile nodes. They are also sensor nodes that run on batteries. Currently, all their detections are forwarded to a central base station, where a localization method integrates them into a position estimation for each bat [NKD15]. The base station is a standard computer with sufficient power and energy. In the future, some parts of the localization may already be done on the ground nodes to reduce the data transmission and thus save some energy.
Recent advances in animal tracking technology have ushered in a new era in biologging. However, t... more Recent advances in animal tracking technology have ushered in a new era in biologging. However, the considerable size of many sophisticated biologging devices restricts their application to larger animals, while old-fashioned techniques often still represent the state-of-the-art for studying small vertebrates. In industrial applications, low-power wireless sensor networks fulfill requirements similar to those needed to monitor animal behavior at high resolution and at low tag weight. We developed a wireless biologging network (WBN), which enables simultaneous direct proximity sensing, high-resolution tracking, and long-range remote data download at tag weights of one to two grams. Deployments to study wild bats created social networks and flight trajectories of unprecedented quality. Our developments highlight the vast capabilities of WBNs and their potential to close an important gap in biologging: fully automated tracking and proximity sensing of small animals, even in closed habi...
IEEE Communications Magazine, 2016
Sensor networks have successfully been used for wildlife monitoring and tracking of different spe... more Sensor networks have successfully been used for wildlife monitoring and tracking of different species. When it comes to small animals such as smaller birds, mammals, or even insects, the current approach is to use extremely lightweight RF tags to be located using radio telemetry. A new quantum leap in technology is needed to overcome these limitations and to enable new ways for observations of larger numbers of small animals. In an interdisciplinary team, we are working on the different aspects of such a new technology. In particular, we report on our findings on a sensor network based tracking solution for bats. Our system is based on integrated localization and wireless communication protocols for ultra-low power systems. This requires coding techniques for improved reliability as well as ranging solutions for tracking hunting bats. We address the technological and methodical problems related to system design, software support, and protocol design. First field experiments have been conducted that showcase the capabilities of our system.
Datenbank-Spektrum, 2015
Data stream processing systems enable querying continuous data without first storing it. Data str... more Data stream processing systems enable querying continuous data without first storing it. Data stream queries may combine data from distributed data sources liked ifferent sensors in an environmental sensing application. This suggests distributed query processing. Thus the amount of transferred data can be reduced and more processing resources are available. However, distributed query processing on probably heterogeneous platforms complicates query optimization. This article investigates query optimization through operator graph changes and its interaction with operator placement on heterogeneous distributed systems. Pre-distribution operator graph changes may prevent certain operator placements. Thereby the resource consumption of the query execution may unexpectedly increase. Based on the operator placement problem modeled as at ask assignment problem (TAP), we prove that it is NP-hard to decide in general whether an arbitrary operator graph change may negatively influence the best possible TAPsolution. We present conditions for several specific operator graph changes that guarantee to preservethe best possible TAPsolution.
Abstract. Nowadays maintenance of database management systems (DBMSs) often requires offline oper... more Abstract. Nowadays maintenance of database management systems (DBMSs) often requires offline operations for enhancement of function-ality or security updates. This hampers the availability of the provided services and can cause undesirable implications. Therefore it is essen-tial to minimize the downtime of DBMSs. We present the CoBRA DB (Component Based Runtime Adaptable DataBase) project that allows the adaptation and extension of a modular DBMS at runtime. In this paper we focus on the definition of an adaptation model describing the semantics of adaptation processes. 1
Database Management Systems (DBMSs) that can be tailored to specific requirements offer the poten... more Database Management Systems (DBMSs) that can be tailored to specific requirements offer the potential to improve reliability and maintainability and simultaneously the ability to reduce the footprint of the code base. If the requirements of an application change during runtime the DBMS should be adapted without a shutdown. Runtime-adaptation is a new and promising research direction to dynamically change the behavior of a DBMS. Especially the adaptation of the Transaction Manager (TM) states a challenge. In this paper, we present the session semantics of a runtime-adaptable TM. We define preliminaries and assumptions to activate the TM during sessions from a conceptual point of view. The advantages and disadvanteges of different ap-proaches are discussed, especially regarding the occurence of ANSI SQL phenomena. From a technical point of view, we define requirements for the architecture of the TM and the DBMS that arose in our prototype.
In this paper the architecture of a distributed and scalable multimedia information retrieval sys... more In this paper the architecture of a distributed and scalable multimedia information retrieval system (Dsmily) is described. The system consists of hierarchically organized networked nodes and is designed to integrate existing dynamic multimedia databases. The document ranking process as well as the preselection of databases to be searched, both tasks are based on a probabilistic model for distributed retrieval. 1 Introduction The Internet provides access to a large amount of data which is growing from day to day. Most of the data are simple text documents, but the fraction of multimedia data like image, audio and video documents is increasing rapidly. Hence, for users, it is getting more and more difficult to find documents containing relevant information. This is true especially for multimedia documents, because often one cannot clearly decide whether a document is relevant or non-relevant. That means, traditional boolean search techniques are not sufficient in this case and theref...
In this paper, we present a concept and implementation of a largely dispersed multimedia database... more In this paper, we present a concept and implementation of a largely dispersed multimedia database system which consists of several multimedia database systems. The users and applications can access the databases in various ways. Our solution also covers the administration of media object duplicates. The entire multimedia database system is a component of a teleservice for workflow management that encourages multimedia. So-called multimedia annotations are attached to workflows and stored in the database system. The annotations are automatically retrieved and transported over networks to the users who perform preassigned parts of workflows. One strength of our implementation is that it is based on the CORBA Object Broker standard which makes it open to other systems. Keywords: Distributed Multimedia Database Systems, Multimedia Database Management Systems, Multimedia Teleservices, Multimedia Enhanced Workflow Management 1 Introduction Workflow management systems (WFMS) are c...
We present an integrated approach for supporting in-network sensor data processing in dynamic and... more We present an integrated approach for supporting in-network sensor data processing in dynamic and heterogeneous sensor networks. The concept relies on data stream processing techniques that define and optimize the distribution of queries and their operators. We anticipate a high degree of dynamics and heterogeneity in the network, which is expected to be the case for wildlife monitoring applications. The distribution of operators to individual nodes demands several system level capabilities not available in current sensor node operating systems. In particular, we developed means for replacing software modules, i.e. small applications, on demand and without loss of status information. In order to facilitate this operation, we added a lightweight module support for the Nut/OS system and implemented a new memory management that uses tags for preserving state across module updates and node reboots. 1
One of the most important input providers for data stream management systems (DSMSs) is a sensor ... more One of the most important input providers for data stream management systems (DSMSs) is a sensor network. Such a network can have query functionality offered as a sensor network query processor (SNQP). Then some of the data stream operators can be executed in the DSMS as well as in the SNQP. This paper addresses the problem of finding the optimal solution. It shows first steps like the moving of operators and the modification of the epoch duration. The primary goal is to prolong the lifetime of the sensor network. A QoS-based goal function is introduced, and the optimization process is explained. It has been implemented with Borealis and TinyDB. Some preliminary results from the ongoing evaluation are given. 1.
In this demo, we explain the working of ReProVide, a framework that integrates an on-the-fly reco... more In this demo, we explain the working of ReProVide, a framework that integrates an on-the-fly reconfigurable FPGA-based SoC architecture with a DBMS for accelerated query processing. For this, a capability-aware optimization that can optimize and partition the queries is demonstrated. This optimization for the hardware is based on its capabilities. Our hardware can also generate statistics of the data while executing a query. In contrast to the existing approaches, this does not have any additional costs in terms of execution time. We will demonstrate how these statistics are later used by the DBMS to select the best plan from the search space using accurate cost values.
The present invention concerns a novel medicament based on aspirin and heptaminol (that is to say... more The present invention concerns a novel medicament based on aspirin and heptaminol (that is to say, 6-amino-2-methyl-2-heptanol).
In this paper, we explain the demonstration of the DataEconomist, a framework for query-driven da... more In this paper, we explain the demonstration of the DataEconomist, a framework for query-driven data minimization in relational DBMS conformable to law. Our approach automatically minimizes user access rights based on the analysis of SQL query logs and thereby enables a parsimonious data processing. A minimization of data collection is reached by automatic detection and manual deletion of data belonging to unneeded schema elements. In contrast to existing approaches, the DataEconomist supports privacy officers by focusing on the queries instead of making them trawl through a vast amount of collected personal data and specify legal use cases for their processing. SQL queries easily showwho has processed when which data for which purpose and make it easy for the privacy officers to decide about the queries’ compliance with data privacy regulations. Our framework does not require any knowledge of SQL by providing a graphical tool for searching and filtering queries and visualizations of...
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Papers by Klaus Meyer-Wegener