TY - JOUR
A1 - Wang, Kewen
A1 - Zhou, Lizhu
T1 - An extension to GCWA and query evaluation for disjunctive deductive databases
Y1 - 2001
ER -
TY - JOUR
A1 - Wang, Kewen
A1 - Zhou, Lizhu
A1 - Lin, Fangzhen
T1 - Alternating fixpoint theory for logic programs with priority
Y1 - 2000
SN - 3-540-67797-6
ER -
TY - THES
A1 - Wang, Long
T1 - X-tracking the usage interest on web sites
T1 - X-tracking des Nutzungsinteresses für Webseiten
N2 - The exponential expanding of the numbers of web sites and Internet users makes WWW the most important global information resource. From information publishing and electronic commerce to entertainment and social networking, the Web allows an inexpensive and efficient access to the services provided by individuals and institutions. The basic units for distributing these services are the web sites scattered throughout the world. However, the extreme fragility of web services and content, the high competence between similar services supplied by different sites, and the wide geographic distributions of the web users drive the urgent requirement from the web managers to track and understand the usage interest of their web customers. This thesis, "X-tracking the Usage Interest on Web Sites", aims to fulfill this requirement. "X" stands two meanings: one is that the usage interest differs from various web sites, and the other is that usage interest is depicted from multi aspects: internal and external, structural and conceptual, objective and subjective. "Tracking" shows that our concentration is on locating and measuring the differences and changes among usage patterns. This thesis presents the methodologies on discovering usage interest on three kinds of web sites: the public information portal site, e-learning site that provides kinds of streaming lectures and social site that supplies the public discussions on IT issues. On different sites, we concentrate on different issues related with mining usage interest. The educational information portal sites were the first implementation scenarios on discovering usage patterns and optimizing the organization of web services. In such cases, the usage patterns are modeled as frequent page sets, navigation paths, navigation structures or graphs. However, a necessary requirement is to rebuild the individual behaviors from usage history. We give a systematic study on how to rebuild individual behaviors. Besides, this thesis shows a new strategy on building content clusters based on pair browsing retrieved from usage logs. The difference between such clusters and the original web structure displays the distance between the destinations from usage side and the expectations from design side. Moreover, we study the problem on tracking the changes of usage patterns in their life cycles. The changes are described from internal side integrating conceptual and structure features, and from external side for the physical features; and described from local side measuring the difference between two time spans, and global side showing the change tendency along the life cycle. A platform, Web-Cares, is developed to discover the usage interest, to measure the difference between usage interest and site expectation and to track the changes of usage patterns. E-learning site provides the teaching materials such as slides, recorded lecture videos and exercise sheets. We focus on discovering the learning interest on streaming lectures, such as real medias, mp4 and flash clips. Compared to the information portal site, the usage on streaming lectures encapsulates the variables such as viewing time and actions during learning processes. The learning interest is discovered in the form of answering 6 questions, which covers finding the relations between pieces of lectures and the preference among different forms of lectures. We prefer on detecting the changes of learning interest on the same course from different semesters. The differences on the content and structure between two courses leverage the changes on the learning interest. We give an algorithm on measuring the difference on learning interest integrated with similarity comparison between courses. A search engine, TASK-Moniminer, is created to help the teacher query the learning interest on their streaming lectures on tele-TASK site. Social site acts as an online community attracting web users to discuss the common topics and share their interesting information. Compared to the public information portal site and e-learning web site, the rich interactions among users and web content bring the wider range of content quality, on the other hand, provide more possibilities to express and model usage interest. We propose a framework on finding and recommending high reputation articles in a social site. We observed that the reputation is classified into global and local categories; the quality of the articles having high reputation is related with the content features. Based on these observations, our framework is implemented firstly by finding the articles having global or local reputation, and secondly clustering articles based on their content relations, and then the articles are selected and recommended from each cluster based on their reputation ranks.
N2 - Wegen des exponentiellen Ansteigens der Anzahl an Internet-Nutzern und Websites ist das WWW (World Wide Web) die wichtigste globale Informationsressource geworden. Das Web bietet verschiedene Dienste (z. B. Informationsveröffentlichung, Electronic Commerce, Entertainment oder Social Networking) zum kostengünstigen und effizienten erlaubten Zugriff an, die von Einzelpersonen und Institutionen zur Verfügung gestellt werden. Um solche Dienste anzubieten, werden weltweite, vereinzelte Websites als Basiseinheiten definiert. Aber die extreme Fragilität der Web-Services und -inhalte, die hohe Kompetenz zwischen ähnlichen Diensten für verschiedene Sites bzw. die breite geographische Verteilung der Web-Nutzer treiben einen dringenden Bedarf für Web-Manager und das Verfolgen und Verstehen der Nutzungsinteresse ihrer Web-Kunden. Die Arbeit zielt darauf ab, dass die Anforderung "X-tracking the Usage Interest on Web Sites" erfüllt wird. "X" hat zwei Bedeutungen. Die erste Bedeutung ist, dass das Nutzungsinteresse von verschiedenen Websites sich unterscheidet. Außerdem stellt die zweite Bedeutung dar, dass das Nutzungsinteresse durch verschiedene Aspekte (interne und externe, strukturelle und konzeptionelle) beschrieben wird. Tracking zeigt, dass die Änderungen zwischen Nutzungsmustern festgelegt und gemessen werden. Die Arbeit eine Methodologie dar, um das Nutzungsinteresse gekoppelt an drei Arten von Websites (Public Informationsportal-Website, E-Learning-Website und Social-Website) zu finden. Wir konzentrieren uns auf unterschiedliche Themen im Bezug auf verschieden Sites, die mit Usage-Interest-Mining eng verbunden werden. Education Informationsportal-Website ist das erste Implementierungsscenario für Web-Usage-Mining. Durch das Scenario können Nutzungsmuster gefunden und die Organisation von Web-Services optimiert werden. In solchen Fällen wird das Nutzungsmuster als häufige Pagemenge, Navigation-Wege, -Strukturen oder -Graphen modelliert. Eine notwendige Voraussetzung ist jedoch, dass man individuelle Verhaltensmuster aus dem Verlauf der Nutzung (Usage History) wieder aufbauen muss. Deshalb geben wir in dieser Arbeit eine systematische Studie zum Nachempfinden der individuellen Verhaltensweisen. Außerdem zeigt die Arbeit eine neue Strategie, dass auf Page-Paaren basierten Content-Clustering aus Nutzungssite aufgebaut werden. Der Unterschied zwischen solchen Clustern und der originalen Webstruktur ist der Abstand zwischen Zielen der Nutzungssite und Erwartungen der Designsite. Darüber hinaus erforschen wir Probleme beim Tracking der Änderungen von Nutzungsmustern in ihrem Lebenszyklus. Die Änderungen werden durch mehrere Aspekte beschrieben. Für internen Aspekt werden konzeptionelle Strukturen und Funktionen integriert. Der externe Aspekt beschreibt physische Eigenschaften. Für lokalen Aspekt wird die Differenz zwischen zwei Zeitspannen gemessen. Der globale Aspekt zeigt Tendenzen der Änderung entlang des Lebenszyklus. Eine Plattform "Web-Cares" wird entwickelt, die die Nutzungsinteressen findet, Unterschiede zwischen Nutzungsinteresse und Website messen bzw. die Änderungen von Nutzungsmustern verfolgen kann. E-Learning-Websites bieten Lernmaterialien wie z.B. Folien, erfaßte Video-Vorlesungen und Übungsblätter an. Wir konzentrieren uns auf die Erfoschung des Lerninteresses auf Streaming-Vorlesungen z.B. Real-Media, mp4 und Flash-Clips. Im Vergleich zum Informationsportal Website kapselt die Nutzung auf Streaming-Vorlesungen die Variablen wie Schauzeit und Schautätigkeiten während der Lernprozesse. Das Lerninteresse wird erfasst, wenn wir Antworten zu sechs Fragen gehandelt haben. Diese Fragen umfassen verschiedene Themen, wie Erforschung der Relation zwischen Teilen von Lehrveranstaltungen oder die Präferenz zwischen den verschiedenen Formen der Lehrveranstaltungen. Wir bevorzugen die Aufdeckung der Veränderungen des Lerninteresses anhand der gleichen Kurse aus verschiedenen Semestern. Der Differenz auf den Inhalt und die Struktur zwischen zwei Kurse beeinflusst die Änderungen auf das Lerninteresse. Ein Algorithmus misst die Differenz des Lerninteresses im Bezug auf einen Ähnlichkeitsvergleich zwischen den Kursen. Die Suchmaschine „Task-Moniminer“ wird entwickelt, dass die Lehrkräfte das Lerninteresse für ihre Streaming-Vorlesungen über das Videoportal tele-TASK abrufen können. Social Websites dienen als eine Online-Community, in den teilnehmenden Web-Benutzern die gemeinsamen Themen diskutieren und ihre interessanten Informationen miteinander teilen. Im Vergleich zur Public Informationsportal-Website und E-Learning Website bietet diese Art von Website reichhaltige Interaktionen zwischen Benutzern und Inhalten an, die die breitere Auswahl der inhaltlichen Qualität bringen. Allerdings bietet eine Social-Website mehr Möglichkeiten zur Modellierung des Nutzungsinteresses an. Wir schlagen ein Rahmensystem vor, die hohe Reputation für Artikel in eine Social-Website empfiehlt. Unsere Beobachtungen sind, dass die Reputation in globalen und lokalen Kategorien klassifiziert wird. Außerdem wird die Qualität von Artikeln mit hoher Reputation mit den Content-Funktionen in Zusammenhang stehen. Durch die folgenden Schritte wird das Rahmensystem im Bezug auf die Überwachungen implementiert. Der erste Schritt ist, dass man die Artikel mit globalen oder lokalen Reputation findet. Danach werden Artikel im Bezug auf ihre Content-Relationen in jeder Kategorie gesammelt. Zum Schluß werden die ausgewählten Artikel aus jedem basierend auf ihren Reputation-Ranking Cluster empfohlen.
KW - Tracking
KW - Nutzungsinteresse
KW - Webseite
KW - Tracking
KW - Usage Interest
KW - Web Sites
Y1 - 2011
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-51077
ER -
TY - JOUR
A1 - Webb, Mary
T1 - Considerations for the Design of Computing Curricula
JF - KEYCIT 2014 - Key Competencies in Informatics and ICT
N2 - This paper originated from discussions about the need for
important changes in the curriculum for Computing including two focus
group meetings at IFIP conferences over the last two years. The
paper examines how recent developments in curriculum, together with
insights from curriculum thinking in other subject areas, especially mathematics
and science, can inform curriculum design for Computing.
The analysis presented in the paper provides insights into the complexity
of curriculum design as well as identifying important constraints and
considerations for the ongoing development of a vision and framework
for a Computing curriculum.
KW - Curriculum
KW - Computer Science
KW - Informatics
KW - curriculum theory
Y1 - 2015
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82723
SN - 1868-0844
SN - 2191-1940
IS - 7
SP - 267
EP - 283
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Wegner, Christian
A1 - Zender, Raphael
A1 - Lucke, Ulrike
T1 - ProtoSense
BT - Interactive Paper Prototyping with Multi-Touch Tables
JF - KEYCIT 2014 - Key Competencies in Informatics and ICT
KW - Interface design
KW - paper prototyping
KW - NUI
Y1 - 2015
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82970
SN - 1868-0844
SN - 2191-1940
IS - 7
SP - 405
EP - 407
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Weidlich, Matthias
A1 - Mendling, Jan
A1 - Weske, Mathias
T1 - Efficient consistency measurement based on behavioral profiles of process models
JF - IEEE transactions on software engineering
N2 - Engineering of process-driven business applications can be supported by process modeling efforts in order to bridge the gap between business requirements and system specifications. However, diverging purposes of business process modeling initiatives have led to significant problems in aligning related models at different abstract levels and different perspectives. Checking the consistency of such corresponding models is a major challenge for process modeling theory and practice. In this paper, we take the inappropriateness of existing strict notions of behavioral equivalence as a starting point. Our contribution is a concept called behavioral profile that captures the essential behavioral constraints of a process model. We show that these profiles can be computed efficiently, i.e., in cubic time for sound free-choice Petri nets w.r.t. their number of places and transitions. We use behavioral profiles for the definition of a formal notion of consistency which is less sensitive to model projections than common criteria of behavioral equivalence and allows for quantifying deviation in a metric way. The derivation of behavioral profiles and the calculation of a degree of consistency have been implemented to demonstrate the applicability of our approach. We also report the findings from checking consistency between partially overlapping models of the SAP reference model.
KW - Process model analysis
KW - process model alignment
KW - behavioral abstraction
KW - consistency checking
KW - consistency measures
Y1 - 2011
U6 - https://doi.org/10.1109/TSE.2010.96
SN - 0098-5589
VL - 37
IS - 3
SP - 410
EP - 429
PB - Inst. of Electr. and Electronics Engineers
CY - Los Alamitos
ER -
TY - JOUR
A1 - Weigend, Michael
T1 - How Things Work
BT - Recognizing and Describing Functionality
JF - KEYCIT 2014 - Key Competencies in Informatics and ICT
N2 - Recognizing and defining functionality is a key competence
adopted in all kinds of programming projects. This study investigates
how far students without specific informatics training are able to identify
and verbalize functions and parameters. It presents observations
from classroom activities on functional modeling in high school chemistry
lessons with altogether 154 students. Finally it discusses the potential
of functional modelling to improve the comprehension of scientific
content.
KW - Function
KW - programming
KW - parameter
KW - competence
KW - abstraction
Y1 - 2015
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82814
SN - 1868-0844
SN - 2191-1940
IS - 7
SP - 285
EP - 298
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Weiher, Marcel
A1 - Hirschfeld, Robert
T1 - Polymorphic identifiers: uniform resource access in objective-smalltalk
JF - ACM SIGPLAN notices
N2 - In object-oriented programming, polymorphic dispatch of operations decouples clients from specific providers of services and allows implementations to be modified or substituted without affecting clients.
The Uniform Access Principle (UAP) tries to extend these qualities to resource access by demanding that access to state be indistinguishable from access to operations. Despite language features supporting the UAP, the overall goal of substitutability has not been achieved for either alternative resources such as keyed storage, files or web pages, or for alternate access mechanisms: specific kinds of resources are bound to specific access mechanisms and vice versa. Changing storage or access patterns either requires changes to both clients and service providers and trying to maintain the UAP imposes significant penalties in terms of code-duplication and/or performance overhead.
We propose introducing first class identifiers as polymorphic names for storage locations to solve these problems. With these Polymorphic Identifiers, we show that we can provide uniform access to a wide variety of resource types as well as storage and access mechanisms, whether parametrized or direct, without affecting client code, without causing code duplication or significant performance penalties.
KW - Identifiers
KW - REST
KW - Uniform Access Principle
KW - Extensibility
Y1 - 2014
U6 - https://doi.org/10.1145/2508168.2508169
SN - 0362-1340
SN - 1558-1160
VL - 49
IS - 2
SP - 61
EP - 71
PB - Association for Computing Machinery
CY - New York
ER -
TY - BOOK
A1 - Weske, Mathias
T1 - Business Process Management : Concepts, Languages, Architectures
Y1 - 2007
SN - 978-3-540-73521-2
U6 - https://doi.org/10.1007/978-3-540-73522-9
PB - Springer-Verlag Berlin Heidelberg
CY - Berlin, Heidelberg
ER -
TY - JOUR
A1 - Weske, Mathias
A1 - van der Aalst, Wil M. P.
A1 - Verbeek, H. M. W.
T1 - Advances in business process management
Y1 - 2004
SN - 0169-023X
ER -
TY - THES
A1 - Wildner, Uwe
T1 - CASC : compiler assisted self-checking of structural integrity
Y1 - 1997
ER -
TY - JOUR
A1 - Wildner, Uwe
T1 - Experimental evaluation of assigned signature checking with return address hashing on different platforms
Y1 - 1997
ER -
TY - JOUR
A1 - Wildner, Uwe
T1 - Compiler assisted self-checking of structural integrity using return adress hashing
Y1 - 1996
ER -
TY - JOUR
A1 - Willig, Andreas
A1 - Matheus, K.
A1 - Wolisz, A.
T1 - Wireless technology in industrial networks
N2 - With the success of wireless technologies in consumer electronics, standard wireless technologies are envisioned for the deployment in industrial environments as well. Industrial applications involving mobile subsystems or just the desire to save cabling make wireless technologies attractive. Nevertheless, these applications often have stringent requirements on reliability and timing. In wired environments, timing and reliability are well catered for by fieldbus systems (which are a mature technology designed to enable communication between digital controllers and the sensors and actuators interfacing to a physical process). When wireless links are included, reliability and timing requirements are significantly more difficult to meet, due to the adverse properties of the radio channels. In this paper we thus discuss some key issues coming up in wireless fieldbus and wireless industrial communication systems:1)fundamental problems like achieving timely and reliable transmission despite channel errors; 2) the usage of existing wireless technologies for this specific field of applications; and 3) the creation of hybrid systems in which wireless stations are included into existing wired systems
Y1 - 2005
SN - 0018-9219
ER -
TY - JOUR
A1 - Willig, Andreas
A1 - Mitschke, Robert
T1 - Results of bit error measurements with sensor nodes and casuistic consequences for design of energy-efficient error control schemes
N2 - For the proper design of energy-efficient error control schemes some insight into channel error patterns is needed. This paper presents bit error and packet loss measurements taken with sensor nodes running the popular RFM
Y1 - 2006
SN - 978-3-540-32158-3
ER -
TY - THES
A1 - Wist, Dominic
T1 - Attacking complexity in logic synthesis of asynchronous circuits
T1 - Komplexitätsbewältigung in der Logiksynthese asynchroner Schaltungen
N2 - Most of the microelectronic circuits fabricated today are synchronous, i.e. they are driven by one or several clock signals. Synchronous circuit design faces several fundamental challenges such as high-speed clock distribution, integration of multiple cores operating at different clock rates, reduction of power consumption and dealing with voltage, temperature, manufacturing and runtime variations. Asynchronous or clockless design plays a key role in alleviating these challenges, however the design and test of asynchronous circuits is much more difficult in comparison to their synchronous counterparts. A driving force for a widespread use of asynchronous technology is the availability of mature EDA (Electronic Design Automation) tools which provide an entire automated design flow starting from an HDL (Hardware Description Language) specification yielding the final circuit layout. Even though there was much progress in developing such EDA tools for asynchronous circuit design during the last two decades, the maturity level as well as the acceptance of them is still not comparable with tools for synchronous circuit design. In particular, logic synthesis (which implies the application of Boolean minimisation techniques) for the entire system's control path can significantly improve the efficiency of the resulting asynchronous implementation, e.g. in terms of chip area and performance. However, logic synthesis, in particular for asynchronous circuits, suffers from complexity problems. Signal Transitions Graphs (STGs) are labelled Petri nets which are a widely used to specify the interface behaviour of speed independent (SI) circuits - a robust subclass of asynchronous circuits. STG decomposition is a promising approach to tackle complexity problems like state space explosion in logic synthesis of SI circuits. The (structural) decomposition of STGs is guided by a partition of the output signals and generates a usually much smaller component STG for each partition member, i.e. a component STG with a much smaller state space than the initial specification. However, decomposition can result in component STGs that in isolation have so-called irreducible CSC conflicts (i.e. these components are not SI synthesisable anymore) even if the specification has none of them. A new approach is presented to avoid such conflicts by introducing internal communication between the components. So far, STG decompositions are guided by the finest output partitions, i.e. one output per component. However, this might not yield optimal circuit implementations. Efficient heuristics are presented to determine coarser partitions leading to improved circuits in terms of chip area. For the new algorithms correctness proofs are given and their implementations are incorporated into the decomposition tool DESIJ. The presented techniques are successfully applied to some benchmarks - including 'real-life' specifications arising in the context of control resynthesis - which delivered promising results.
N2 - Moderner Schaltungsentwurf fokussiert hauptsächlich synchrone Schaltungstechnik mit allen inhärenten Problemen. Asynchone (d.h. ungetaktete) Schaltungen zeichnen sich jedoch nicht nur durch das Fehlen der Taktversatzproblematik gegenüber ihren synchronen Pendents aus, sondern auch insbesondere durch geringeren Energieverbrauch, günstigere EMV-Eigenschaften, hohe Performance, Modularität und Robustheit gegenüber Schwankungen in der Spannungsversorgung, im Herstellungsprozess sowie Temperaturunterschieden. Diese Vorteile werden mit höherer Integration sowie höheren Taktraten signifikanter. Jedoch ist der Entwurf und auch der Test asynchroner Schaltungen erheblich schwieriger verglichen mit synchronen Schaltungen. Entwurfswerkzeuge zur Synthese asynchroner Schaltungen aus Hochsprachen-Spezifikationen sind zwar inzwischen verfügbar, sie sind jedoch noch nicht so ausgereift und bei weitem noch nicht so akzeptiert in der Industrie, wie ihre Äquivalente für den synchronen Schaltungsentwurf. Insbesondere fehlt es an Werkzeugunterstützung im Bereich der Logiksynthese komplexer Steuerungen („Controller“), welche kritisch für die Effizienz – z.B. in Bezug auf Chipfläche und Geschwindigkeit – der resultierenden Schaltungen oder Systeme ist. Zur Spezifikation von Steuerungen haben sich Signalflankengraphen („signal transition graphs“, STGs) bewährt, die auch als Entwurfseinstieg für eine Logiksynthese von SI-Schaltungen („speed independent“) verwendet werden. (SI-Schaltungen gelten als sehr robuste asynchrone Schaltungen.) Aus den STGs werden zwecks Logiksynthese Automaten abgeleitet werden, deren Zustandszahl aber oft prohibitiv groß werden kann. Durch sogenannte STG-Dekomposition wird die Logiksynthese einer komplexen Schaltung ermöglicht, was bislang aufgrund von Zustandsexplosion oft nicht möglich war. Dabei wird der Spezifikations-STG laut einer gegebenen Partition von Ausgangssignalen in viele kleinere Teilnetze dekomponiert, wobei zu jedem Partitionsblock ein Teilnetz – mit normalerweise signifikant kleinerem Zustandsraum im Vergleich zur Spezifikation – erzeugt wird. Zu jedem Teilnetz wird dann eine Teilschaltung (Komponente) mittels Logiksynthese generiert. Durch die Anwendung von STG-Dekomposition können jedoch Teilnetze erzeugt werden, die sogenannte irreduzible CSC-Konflikte aufweisen (d.h. zu diesen Teilnetzen kann keine SI-Schaltung erzeugt werden), obwohl die Spezifikation keine solchen Konflikte hatte. Diese Arbeit präsentiert einen neuen Ansatz, welcher die Entstehung solcher irreduziblen Konflikte vermeidet, und zwar durch die Einführung interner Kommunikation zwischen den (zu den Teilnetzen gehörenden) Schaltungskomponenten. Bisher werden STG-Dekompositionen total durchgeführt, d.h. pro resultierender Komponente wird ein Ausgangssignal erzeugt. Das führt gewöhnlich nicht zu optimalen Schaltungsimplementierungen. In dieser Arbeit werden Heuristiken zur Bestimmung gröberer Ausgabepartitionen (d.h. Partitionsblöcke mit mehreren Ausgangssignalen) vorgestellt, die zu kleineren Schaltungen führen. Die vorgestellten Algorithmen werden formal abgesichert und wurden in das bereits vorhandene Dekompositionswerkzeug DESIJ integriert. An praxisrelevanten Beispielen konnten die vorgestellten Verfahren erfolgreich erprobt werden.
KW - Asynchrone Schaltung
KW - Logiksynthese
KW - Komplexitätsbewältigung
KW - STG-Dekomposition
KW - CSC
KW - asynchronous circuit
KW - logic synthesis
KW - speed independence
KW - STG decomposition
KW - CSC
Y1 - 2011
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-59706
ER -
TY - THES
A1 - Wolter, Christian
T1 - A methodology for model-driven process security
Y1 - 2010
CY - Potsdam
ER -
TY - JOUR
A1 - Wong, P.
A1 - Besnard, Philippe
T1 - Paraconsistent reasoning as an analytical tool
Y1 - 2000
SN - 1367-0751
ER -
TY - BOOK
A1 - Wu, K.
A1 - Karri, R.
A1 - Kuznetsov, Grigory
A1 - Gössel, Michael
T1 - Low Cost Concurrent Error Detection for the Advanced Encryption Standart
T3 - Preprint / Universität Potsdam, Institut für Informatik
Y1 - 2003
SN - 0946-7580
VL - 2003, 8
PB - Univ.
CY - Potsdam
ER -
TY - THES
A1 - Wust, Johannes
T1 - Mixed workload managment for in-memory databases
BT - executing mixed workloads of enterprise applications with TAMEX
Y1 - 2015
ER -
TY - JOUR
A1 - Wübbeler, G.
A1 - Ziehe, Andreas
A1 - Mackert, B.-M.
A1 - Müller, Klaus-Robert
A1 - Trahms, L.
A1 - Curio, Gabriel
T1 - Independent component analysis of noninvasively recorded cortical magnetic DC-fields in humans
Y1 - 2000
ER -
TY - GEN
A1 - Xenikoudakis, Georgios
A1 - Ahmed, Mayeesha
A1 - Harris, Jacob Colt
A1 - Wadleigh, Rachel
A1 - Paijmans, Johanna L. A.
A1 - Hartmann, Stefanie
A1 - Barlow, Axel
A1 - Lerner, Heather
A1 - Hofreiter, Michael
T1 - Ancient DNA reveals twenty million years of aquatic life in beavers
T2 - Current biology : CB
N2 - Xenikoudakis et al. report a partial mitochondrial genome of the extinct giant beaver Castoroides and estimate the origin of aquatic behavior in beavers to approximately 20 million years. This time estimate coincides with the extinction of terrestrial beavers and raises the question whether the two events had a common cause.
Y1 - 2020
U6 - https://doi.org/10.1016/j.cub.2019.12.041
SN - 0960-9822
SN - 1879-0445
VL - 30
IS - 3
SP - R110
EP - R111
PB - Current Biology Ltd.
CY - London
ER -
TY - THES
A1 - Yang, Haojin
T1 - Automatic video indexing and retrieval using video ocr technology
Y1 - 2013
CY - Potsdam
ER -
TY - THES
A1 - Zarezadeh, Aliakbar
T1 - Distributed smart cameras : architecture and communication protocols
Y1 - 2012
CY - Potsdam
ER -
TY - JOUR
A1 - Zender, Raphael
A1 - Metzler, Richard
A1 - Lucke, Ulrike
T1 - FreshUP-A pervasive educational game for freshmen
JF - Pervasive and mobile computing
N2 - Students beginning their studies at university face manifold problems such as orientation in a new environment and organizing their courses. This article presents the implementation and successful empirical evaluation of the pervasive browser-based educational game "FreshUP", which aims at helping to overcome the initial difficulties of freshmen. In contrast to a conventional scavenger hunt, mobile pervasive games like FreshUP, bridging in-game and real world activities, have the potential to provide help in a motivating manner using new technology which is currently becoming more and more common. (C) 2013 Elsevier B.V. All rights reserved.
KW - Pervasive game
KW - Campus
KW - Freshmen
KW - e-learning
KW - Mobile devices
KW - SOA
KW - Evaluation
Y1 - 2014
U6 - https://doi.org/10.1016/j.pmcj.2013.09.003
SN - 1574-1192
SN - 1873-1589
VL - 14
SP - 47
EP - 56
PB - Elsevier
CY - Amsterdam
ER -
TY - THES
A1 - Zhou, Wei
T1 - Access control model and policies for collaborative environments
Y1 - 2008
CY - Potsdam
ER -
TY - THES
A1 - Ziehe, Andreas
T1 - Blind source separation based on joint diagonalization of matrices with applications in biomedical signal processing
T1 - Blinde Signalquellentrennung beruhend auf simultaner Diagonalisierung von Matrizen mit Anwendungen in der biomedizinischen Signalverarbeitung
T1 - Blinde Signalquellentrennung beruhend auf simultaner Diagonalisierung von Matrizen mit Anwendungen in der biomedizinischen Signalverarbeitung
N2 - This thesis is concerned with the solution of the blind source separation problem (BSS). The BSS problem occurs frequently in various scientific and technical applications. In essence, it consists in separating meaningful underlying components out of a mixture of a multitude of superimposed signals. In the recent research literature there are two related approaches to the BSS problem: The first is known as Independent Component Analysis (ICA), where the goal is to transform the data such that the components become as independent as possible. The second is based on the notion of diagonality of certain characteristic matrices derived from the data. Here the goal is to transform the matrices such that they become as diagonal as possible. In this thesis we study the latter method of approximate joint diagonalization (AJD) to achieve a solution of the BSS problem. After an introduction to the general setting, the thesis provides an overview on particular choices for the set of target matrices that can be used for BSS by joint diagonalization. As the main contribution of the thesis, new algorithms for approximate joint diagonalization of several matrices with non-orthogonal transformations are developed. These newly developed algorithms will be tested on synthetic benchmark datasets and compared to other previous diagonalization algorithms. Applications of the BSS methods to biomedical signal processing are discussed and exemplified with real-life data sets of multi-channel biomagnetic recordings.
N2 - Diese Arbeit befasst sich mit der Lösung des Problems der blinden Signalquellentrennung (BSS). Das BSS Problem tritt häufig in vielen wissenschaftlichen und technischen Anwendungen auf. Im Kern besteht das Problem darin, aus einem Gemisch von überlagerten Signalen die zugrundeliegenden Quellsignale zu extrahieren. In wissenschaftlichen Publikationen zu diesem Thema werden hauptsächlich zwei Lösungsansätze verfolgt: Ein Ansatz ist die sogenannte "Analyse der unabhängigen Komponenten", die zum Ziel hat, eine lineare Transformation V der Daten X zu finden, sodass die Komponenten Un der transformierten Daten U = V X (die sogenannten "independent components") so unabhängig wie möglich sind. Ein anderer Ansatz beruht auf einer simultanen Diagonalisierung mehrerer spezieller Matrizen, die aus den Daten gebildet werden. Diese Möglichkeit der Lösung des Problems der blinden Signalquellentrennung bildet den Schwerpunkt dieser Arbeit. Als Hauptbeitrag der vorliegenden Arbeit präsentieren wir neue Algorithmen zur simultanen Diagonalisierung mehrerer Matrizen mit Hilfe einer nicht-orthogonalen Transformation. Die neu entwickelten Algorithmen werden anhand von numerischen Simulationen getestet und mit bereits bestehenden Diagonalisierungsalgorithmen verglichen. Es zeigt sich, dass unser neues Verfahren sehr effizient und leistungsfähig ist. Schließlich werden Anwendungen der BSS Methoden auf Probleme der biomedizinischen Signalverarbeitung erläutert und anhand von realistischen biomagnetischen Messdaten wird die Nützlichkeit in der explorativen Datenanalyse unter Beweis gestellt.
KW - Signaltrennung
KW - Mischung
KW - Diagonalisierung
KW - Bioelektrisches Signal
KW - Magnetoencephalographie
KW - Elektroencephalographie
KW - Signalquellentrennung
KW - Matrizen-Eigenwertaufgabe
KW - Simultane Diagonalisierung
KW - Optimierungsproblem
KW - blind source separation
KW - BSS
KW - ICA
KW - independent component analysis
KW - approximate joint diagonalization
KW - EEG
KW - MEG
Y1 - 2005
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-5694
ER -
TY - JOUR
A1 - Ziehe, Andreas
A1 - Kawanabe, Motoaki
A1 - Harmeling, Stefan
T1 - Blind separation of post-nonlinear mixtures using linearizing transformations and temporal decorrelation
N2 - We propose two methods that reduce the post-nonlinear blind source separation problem (PNL-BSS) to a linear BSS problem. The first method is based on the concept of maximal correlation: we apply the alternating conditional expectation (ACE) algorithm-a powerful technique from nonparametric statistics-to approximately invert the componentwise nonlinear functions. The second method is a Gaussianizing transformation, which is motivated by the fact that linearly mixed signals before nonlinear transformation are approximately Gaussian distributed. This heuristic, but simple and efficient procedure works as good as the ACE method. Using the framework provided by ACE, convergence can be proven. The optimal transformations obtained by ACE coincide with the sought-after inverse functions of the nonlinearitics. After equalizing the nonlinearities, temporal decorrelation separation (TDSEP) allows us to recover the source signals. Numerical simulations testing "ACE-TD" and "Gauss-TD" on realistic examples are performed with excellent results
Y1 - 2004
SN - 1532-4435
ER -
TY - JOUR
A1 - Ziehe, Andreas
A1 - Müller, Klaus-Robert
A1 - Nolte, G.
A1 - Mackert, B.-M.
A1 - Curio, Gabriel
T1 - Artifact reduction in magnetoneurography based on time-delayed second-order correlations
Y1 - 2000
ER -
TY - JOUR
A1 - Zien, Alexander
A1 - Rätsch, Gunnar
A1 - Mika, Sebastian
A1 - Schölkopf, Bernhard
A1 - Lengauer, Thomas
A1 - Müller, Klaus-Robert
T1 - Engineering support vector machine kernels that recognize translation initiation sites
Y1 - 2000
SN - 1367-4803
ER -
TY - JOUR
A1 - Zieris, Holger
A1 - Gerstberger, Herbert
A1 - Müller, Wolfgang
T1 - Using Arduino-Based Experiments to Integrate Computer Science Education and Natural Science
JF - KEYCIT 2014 - Key Competencies in Informatics and ICT
N2 - Current curricular trends require teachers in Baden-
Wuerttemberg (Germany) to integrate Computer Science (CS) into
traditional subjects, such as Physical Science. However, concrete guidelines
are missing. To fill this gap, we outline an approach where a
microcontroller is used to perform and evaluate measurements in the
Physical Science classroom.
Using the open-source Arduino platform, we expect students to acquire
and develop both CS and Physical Science competencies by using a
self-programmed microcontroller. In addition to this combined development
of competencies in Physical Science and CS, the subject matter
will be embedded in suitable contexts and learning environments,
such as weather and climate.
KW - Computer Science Education
KW - Natural Science Education
KW - Inquiry-based Learning
KW - Physical Science
KW - Measurement
KW - Arduino
KW - Sensors
Y1 - 2015
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82938
SN - 1868-0844
SN - 2191-1940
IS - 7
SP - 381
EP - 389
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - BOOK
ED - Lambrecht, Anna-Lena
ED - Margaria, Tizian
T1 - Process design for natural scientists
BT - an agile model-driven approach
T3 - Communications in computer and information science ; 500
N2 - This book presents an agile and model-driven approach to manage scientific workflows. The approach is based on the Extreme Model Driven Design (XMDD) paradigm and aims at simplifying and automating the complex data analysis processes carried out by scientists in their day-to-day work. Besides documenting the impact the workflow modeling might have on the work of natural scientists, this book serves three major purposes: 1. It acts as a primer for practitioners who are interested to learn how to think in terms of services and workflows when facing domain-specific scientific processes. 2. It provides interesting material for readers already familiar with this kind of tools, because it introduces systematically both the technologies used in each case study and the basic concepts behind them. 3. As the addressed thematic field becomes increasingly relevant for lectures in both computer science and experimental sciences, it also provides helpful material for teachers that plan similar courses.
Y1 - 2014
SN - 978-3-662-45005-5
PB - Springer
CY - Wiesbaden
ER -
TY - BOOK
ED - Rabe, Bernhard
ED - Rasche, Andreas
T1 - Proceedings of the 2nd International Workshop on e-learning and Virtual and Remote Laboratories
T3 - Technische Berichte des Hasso-Plattner-Instituts für Softwaresystemtechnik an der Universität Potsda
Y1 - 2008
SN - 978-3-940793-17-1
SN - 1613-5652
VL - 21
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - BOOK
ED - Jürgensen, Helmut
T1 - Accessible Media : Pre-Proceedings of a Workshop Potsdam 8-9 May, 2006
T3 - Preprint / Universität Potsdam, Institut für Informatik
Y1 - 2006
SN - 0946-7580
VL - 2006, 7
PB - Univ.
CY - Potsdam
ER -
TY - CHAP
ED - Geske, Ulrich
ED - Wolf, Armin
T1 - Proceedings of the 23rd Workshop on (Constraint) Logic Programming 2009
N2 - The workshops on (constraint) logic programming (WLP) are the annual meeting of the Society of Logic Programming (GLP e.V.) and bring together researchers interested in logic programming, constraint programming, and related areas like databases, artificial intelligence and operations research. The 23rd WLP was held in Potsdam at September 15 – 16, 2009. The topics of the presentations of WLP2009 were grouped into the major areas: Databases, Answer Set Programming, Theory and Practice of Logic Programming as well as Constraints and Constraint Handling Rules.
KW - Logic Programming
KW - Constraint Solving
KW - Logics
KW - Deduction
KW - Planing
KW - Optimization
Y1 - 2010
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-37977
SN - 978-3-86956-026-7
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - BOOK
ED - Schröder-Preikschat, Wolfgang
ED - Wu, Min-You
T1 - The journal of supercomputing : trends in parallel operating systems
Y1 - 1995
PB - Kluwer
CY - Boston
ER -
TY - BOOK
ED - Benferhat, Salem
ED - Besnard, Philippe
T1 - Symbolic and quantitative approaches to reasoning with uncertainty : 6th European conference, ECSQARU 2001, Toulouse, France, September 19 - 21, 2001 ; proceedings
T3 - Lecture notes in computer science
Y1 - 2001
SN - 3-540-42464-4
U6 - https://doi.org/10.1007/3-540-44652-4
VL - 2143
PB - Springer
CY - Berlin, Heidelberg
ER -
TY - BOOK
ED - Solla, Sara A.
ED - Müller, Klaus-Robert
T1 - Advances in neural information processing systems 12 : proceedings of the 1999 conference
Y1 - 2000
SN - 0-262-19450-3
PB - MIT Press
CY - Cambridge, Mass.
ER -
TY - BOOK
ED - Boldt, Oliver
ED - Jürgensen, Helmut
ED - Robbins, L. E.
T1 - Workshop on Implementing Automata : WIA99 - pre-proceedings ; Potsdam, Germany, 17 - 19. July 1999
T3 - Preprint / Universität Potsdam, Institut für Informatik
Y1 - 1999
SN - 0946-7580
VL - 1999, 4
PB - Univ.
CY - Potsdam
ER -
TY - GEN
ED - Plattner, Hasso
ED - Meinel, Christoph
ED - Leifer, Larry
T1 - Design thinking : understand - improve - apply
Y1 - 2011
SN - 978-3-642-13756-3
PB - Springer-Verlag Berlin Heidelberg
CY - Berlin, Heidelberg
ER -
TY - BOOK
ED - Plattner, Hasso
ED - Meinel, Christoph
ED - Leifer, Larry
T1 - Dsign thinking research : studying co-creation in practice
Y1 - 2012
SN - 978-3-642-21642-8
U6 - https://doi.org/10.1007/978-3-642-21643-5
PB - Springer Berlin Heidelberg
CY - Berlin, Heidelberg
ER -
TY - BOOK
ED - Brewka, Gerhard
ED - Witteveen, Cees
ED - Schaub, Torsten
T1 - Proceedings of the Fifth Dutch German Workshop on Nonmonotonic Reasoning Techniques and their Applications, DGNMR'2001, Potsdam, 4. - 6. April 2001
Y1 - 2001
CY - Potsdam
ER -