Challenging Information Systems on a Web-Scale: Responsive Open Community Inf...Ralf Klamma
The document discusses reflective open community information systems on a web scale. It notes that the web is a fragmented, scale-free network based on trust and passion within communities. It presents paradigms of web science that combine analytic and synthetic approaches. It then outlines several technologies and tools for building responsive open community environments, supporting communities, and performing community analytics. Examples of demos and teaching activities are also provided.
Rakebul Hasan's document discusses explanation in the semantic web. It provides an overview of explanation in early expert systems and outlines several approaches to generating explanations in the semantic web, including representing justifications, provenance, trust and consuming explanations for both machines and humans. The document also discusses semantic web features like collaboration, autonomy and ontologies from an explanation perspective and several frameworks for generating explanations in the semantic web like the Inference Web, Accountability in RDF and Proof Explanation in Semantic Web. It concludes by noting areas for future work in generating and representing explanations.
Modern learning models require linking experiences in training environments with experiences in the real-world. However, data about real-world experiences is notoriously hard to collect. Social spaces bring new opportunities to tackle this challenge, supplying digital traces where people talk about their real-world experiences. These traces can become valuable resource, especially in ill-defined domains that embed multiple interpretations. The paper presents a unique approach to aggregate content from social spaces into a semantic-enriched data browser to facilitate informal learning in ill-defined domains. This work pioneers a new way to exploit digital traces about real-world experiences as authentic examples in informal learning contexts. An exploratory study is used to determine both strengths and areas needing attention. The results suggest that semantics can be successfully used in social spaces for informal learning – especially when combined with carefully designed nudges.
ECLAP Tutorial first part, ECLAP 2012 conference. the general overviewPaolo Nesi
The document provides an overview of the ECLAP project, which aims to create a social service portal and digital archive for performing arts content. It discusses the goals of providing high quality metadata and tools for libraries, education, and access across different devices. The ECLAP system will include services for content aggregation, semantic searching, recommendations, networking and distribution to partners like Europeana.
The document summarizes trends in semantic technology and semantic search. It discusses how information technology is increasingly digital and communication between humans and computers is common. It notes that semantics is a missing piece to fully integrate digital content, business processes, devices, and the internet. It then provides an overview of semantic technologies like ontologies, semantic search, and linked data.
The document discusses semantic web technologies and enterprise computing. It describes how semantic web labeling of data allows both humans and machines to more effectively use and understand data. It provides examples of domain ontologies used in banking, healthcare, online advertising, and business-to-business applications. It also discusses how semantic web technologies can transform enterprise intranets and access control from role-based to community-based systems. Finally, it outlines semantic web infrastructure including triple stores, RDFizers, ontology editors, and application frameworks.
Learning Analytics for the Lifelong Long Tail LearnerRalf Klamma
Learning Analytics for the Lifelong Long Tail Learner
Ralf Klamma
RWTH Aachen University
Informatik 5 (DBIS)
CELSTEC, Heerlen, The Netherlands
February 24, 2011
Challenging Information Systems on a Web-Scale: Responsive Open Community Inf...Ralf Klamma
The document discusses reflective open community information systems on a web scale. It notes that the web is a fragmented, scale-free network based on trust and passion within communities. It presents paradigms of web science that combine analytic and synthetic approaches. It then outlines several technologies and tools for building responsive open community environments, supporting communities, and performing community analytics. Examples of demos and teaching activities are also provided.
Rakebul Hasan's document discusses explanation in the semantic web. It provides an overview of explanation in early expert systems and outlines several approaches to generating explanations in the semantic web, including representing justifications, provenance, trust and consuming explanations for both machines and humans. The document also discusses semantic web features like collaboration, autonomy and ontologies from an explanation perspective and several frameworks for generating explanations in the semantic web like the Inference Web, Accountability in RDF and Proof Explanation in Semantic Web. It concludes by noting areas for future work in generating and representing explanations.
Modern learning models require linking experiences in training environments with experiences in the real-world. However, data about real-world experiences is notoriously hard to collect. Social spaces bring new opportunities to tackle this challenge, supplying digital traces where people talk about their real-world experiences. These traces can become valuable resource, especially in ill-defined domains that embed multiple interpretations. The paper presents a unique approach to aggregate content from social spaces into a semantic-enriched data browser to facilitate informal learning in ill-defined domains. This work pioneers a new way to exploit digital traces about real-world experiences as authentic examples in informal learning contexts. An exploratory study is used to determine both strengths and areas needing attention. The results suggest that semantics can be successfully used in social spaces for informal learning – especially when combined with carefully designed nudges.
ECLAP Tutorial first part, ECLAP 2012 conference. the general overviewPaolo Nesi
The document provides an overview of the ECLAP project, which aims to create a social service portal and digital archive for performing arts content. It discusses the goals of providing high quality metadata and tools for libraries, education, and access across different devices. The ECLAP system will include services for content aggregation, semantic searching, recommendations, networking and distribution to partners like Europeana.
The document summarizes trends in semantic technology and semantic search. It discusses how information technology is increasingly digital and communication between humans and computers is common. It notes that semantics is a missing piece to fully integrate digital content, business processes, devices, and the internet. It then provides an overview of semantic technologies like ontologies, semantic search, and linked data.
The document discusses semantic web technologies and enterprise computing. It describes how semantic web labeling of data allows both humans and machines to more effectively use and understand data. It provides examples of domain ontologies used in banking, healthcare, online advertising, and business-to-business applications. It also discusses how semantic web technologies can transform enterprise intranets and access control from role-based to community-based systems. Finally, it outlines semantic web infrastructure including triple stores, RDFizers, ontology editors, and application frameworks.
Learning Analytics for the Lifelong Long Tail LearnerRalf Klamma
Learning Analytics for the Lifelong Long Tail Learner
Ralf Klamma
RWTH Aachen University
Informatik 5 (DBIS)
CELSTEC, Heerlen, The Netherlands
February 24, 2011
Enhancing Academic Event Participation with Context-aware and Social Recommen...Dejan Kovachev
The plethora of talks and presentations taking place at academic conferences makes it difficult, especially for young researchers to attend the
right talks or discuss with participants and potential collaborators with similar interests. Participants may not have a priori knowledge that allows
them to select the right talks or informal interactions with other participants. In this paper we present the context-aware mobile
recommendation services (CAMRS) based on the current context (whereabouts at the venue, popularity and activities of talks and presentations)
sensed at the conference venue. Additionally, we augment the current context with the academic community context of conference participants
which is inferred by using social network analysis and link prediction on large-scale co-authorship and citation networks of participants. By
combining the dynamic and social context of participants, we are able to recommend talks and people that may be interesting to a particular
participant. We evaluated CAMRS using data from two large digital libraries - the DBLP and CiteSeerX, and participants from two conferences -
ICWL 2010 and EC-TEL 2011. The result shows that the new approach can recommend novel talks and helps participants in establishing new
connections at conference venue.
A Real-time Collaboration-enabled Mobile Augmented Reality System with Semant...Dejan Kovachev
This document presents XMMC, a real-time collaboration-enabled mobile augmented reality system with semantic multimedia. XMMC allows experts to collaboratively document cultural heritage sites using multimedia annotations and metadata. It uses an XMPP-based architecture to enable real-time sharing of multimedia and annotations between mobile clients. Concurrent editing of XML metadata is supported using an adaptation of the CEFX+ algorithm. An XMPP-extended augmented reality browser integrates multimedia annotations and metadata into a live video stream. Evaluation shows XMMC supports the collaborative documentation workflow while increasing cultural heritage awareness.
The European Technology Enhanced Learning LandscapeMichael Derntl
The document discusses analyzing the technology enhanced learning (TEL) landscape through mapping publication venues and trends, collaborations between authors, and funded projects in order to understand the current state and possible future directions of the TEL research community. Data sources that will be used include bibliographic databases, publication information, and project details with the goal of conducting both quantitative and qualitative analyses.
The document discusses a cloud multimedia platform and its applications. It begins with an agenda that covers cloud computing concepts, multimedia in the cloud, case studies, and a summary. Case studies include multimedia processing and metadata, social network analysis in the cloud, and mobile multimedia elastic cloud applications. The summary states that cloud computing provides on-demand scalability, drives new data processing systems, allows fast development of scalable multimedia services, and has benefits for multimedia systems by offloading heavy tasks to cloud services. It asks what types of tasks are reasonable to implement in the cloud.
This slide deck discusses scaling community information systems. It provides background on RWTH Aachen University and the Advanced Community Information Systems group. It then discusses challenges in scaling community systems, including privacy, sustainability, legacy systems, and scaling to other communities/regions. It also presents the las2peer platform and its goals of creating distributed, reliable, and secure systems to support community services and handle information trustworthily.
Reflection Support for Communities on the WebRalf Klamma
This document describes TeLLNet, a research project that aims to support communities on the web through reflection. It discusses community information systems, modeling community dependencies using the i* framework, analyzing social networks and disturbances in communities, and applying these techniques to case studies of open source software communities and a knowledge network of computer science research. The goal is to help communities better understand themselves and their learning and collaboration processes through reflective social network analysis and visualization tools.
Here are the key steps I would take to design a computer network:
1. Define the goals and needs of the network. What needs to be connected? How many users? What applications and services will be used?
2. Map out the physical layout. Where are devices located? How will they connect - wired or wireless? Design a logical topology to organize devices.
3. Select network hardware. Choose switches, routers, access points suitable for the size and needs. Consider wired/wireless infrastructure requirements.
4. Design the IP addressing scheme. Plan subnetting and IP ranges for efficient use of available addresses.
5. Configure network segmentation. Use VLANs or separate subnets to logically separate traffic as needed for
NetLearn: Social Network Analysis and Visualizations for LearningMohamed Amine Chatti
The most valuable and innovative knowledge is hard to find,
and it lies within distributed communities and networks. Locating the
right community or person who can provide us with exactly the knowledge
that we need and who can help us solve exactly the problems that
we come upon, can be an ecient way to learn forward. In this paper, we
present the details of NetLearn; a service that acts as a knowledge lter
for learning. The primary aim of NetLearn is to leverage social network
analysis and visualization techniques to help learners mine communities
and locate experts that can populate their personal learning environments.
2009-C&T-NodeXL and social queries - a social media network analysis toolkitMarc Smith
This document introduces NodeXL, a network analysis toolkit implemented as an Excel add-in. NodeXL allows users to import social network data, calculate network metrics, and generate network graphs and visualizations within Excel. The document outlines NodeXL's key features, including importing data from sources like email and Twitter, calculating metrics like degree and centrality, and generating customizable node-link diagrams. It also discusses related work and provides an example analysis workflow using NodeXL to analyze an enterprise social network, revealing patterns in employee connections. NodeXL aims to make network analysis accessible to novice and expert users through a familiar spreadsheet interface.
Based on the Blueprint Architectural Design of the City of Weslaco's Multiprotocal Label Switching Fiber Network. A joint team effort between the Weslaco IT Department and SmartCom of McAllen.
Im 2021 tutorial next-generation closed-loop automation - an inside view - ...Ishan Vaishnavi
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
Next-Generation Closed-Loop Automation - an Inside ViewLaurent Ciavaglia
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
IEEE IM 2021 Tutorial - Next-generation closed-loop automation - an inside viewPedro Henrique Gomes
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
Semantic domain ontologies are increasingly seen as the key for enabling
interoperability across heterogeneous systems and sensor-based applications.
The ontologies deployed in these systems and applications are developed by
restricted groups of domain experts and not by semantic web experts. Lately,
folksonomies are increasingly exploited in developing ontologies. The
“collective intelligence”, which emerge from collaborative tagging can be
seen as an alternative for the current effort at semantic web ontologies.
However, the uncontrolled nature of social tagging systems leads to many
kinds of noisy annotations, such as misspellings, imprecision and ambiguity.
Thus, the construction of formal ontologies from social tagging data remains
a real challenge. Most of researches have focused on how to discover
relatedness between tags rather than producing ontologies, much less domain
ontologies. This paper proposed an algorithm that utilises tags in social
tagging systems to automatically generate up-to-date specific-domain
ontologies. The evaluation of the algorithm, using a dataset extracted from
BibSonomy, demonstrated that the algorithm could effectively learn a
domain terminology, and identify more meaningful semantic information for
the domain terminology. Furthermore, the proposed algorithm introduced a
simple and effective method for disambiguating tags.
The Legacy of ROLE - Where are we at the workplace?Ralf Klamma
This slide deck discusses the Responsive Open Learning Environments (ROLE) project. It provides an overview of the ROLE conceptualization of self-regulated learning and technical infrastructure. It then summarizes two case studies that implemented ROLE - the BOOST project which used ROLE to support skills training in businesses, and the VIRTUS project which developed a virtual vocational education system using ROLE. It concludes by discussing the future potential for ROLE in areas like mixed reality environments and domain-specific learning.
Enhancing Academic Event Participation with Context-aware and Social Recommen...Dejan Kovachev
The plethora of talks and presentations taking place at academic conferences makes it difficult, especially for young researchers to attend the
right talks or discuss with participants and potential collaborators with similar interests. Participants may not have a priori knowledge that allows
them to select the right talks or informal interactions with other participants. In this paper we present the context-aware mobile
recommendation services (CAMRS) based on the current context (whereabouts at the venue, popularity and activities of talks and presentations)
sensed at the conference venue. Additionally, we augment the current context with the academic community context of conference participants
which is inferred by using social network analysis and link prediction on large-scale co-authorship and citation networks of participants. By
combining the dynamic and social context of participants, we are able to recommend talks and people that may be interesting to a particular
participant. We evaluated CAMRS using data from two large digital libraries - the DBLP and CiteSeerX, and participants from two conferences -
ICWL 2010 and EC-TEL 2011. The result shows that the new approach can recommend novel talks and helps participants in establishing new
connections at conference venue.
A Real-time Collaboration-enabled Mobile Augmented Reality System with Semant...Dejan Kovachev
This document presents XMMC, a real-time collaboration-enabled mobile augmented reality system with semantic multimedia. XMMC allows experts to collaboratively document cultural heritage sites using multimedia annotations and metadata. It uses an XMPP-based architecture to enable real-time sharing of multimedia and annotations between mobile clients. Concurrent editing of XML metadata is supported using an adaptation of the CEFX+ algorithm. An XMPP-extended augmented reality browser integrates multimedia annotations and metadata into a live video stream. Evaluation shows XMMC supports the collaborative documentation workflow while increasing cultural heritage awareness.
The European Technology Enhanced Learning LandscapeMichael Derntl
The document discusses analyzing the technology enhanced learning (TEL) landscape through mapping publication venues and trends, collaborations between authors, and funded projects in order to understand the current state and possible future directions of the TEL research community. Data sources that will be used include bibliographic databases, publication information, and project details with the goal of conducting both quantitative and qualitative analyses.
The document discusses a cloud multimedia platform and its applications. It begins with an agenda that covers cloud computing concepts, multimedia in the cloud, case studies, and a summary. Case studies include multimedia processing and metadata, social network analysis in the cloud, and mobile multimedia elastic cloud applications. The summary states that cloud computing provides on-demand scalability, drives new data processing systems, allows fast development of scalable multimedia services, and has benefits for multimedia systems by offloading heavy tasks to cloud services. It asks what types of tasks are reasonable to implement in the cloud.
This slide deck discusses scaling community information systems. It provides background on RWTH Aachen University and the Advanced Community Information Systems group. It then discusses challenges in scaling community systems, including privacy, sustainability, legacy systems, and scaling to other communities/regions. It also presents the las2peer platform and its goals of creating distributed, reliable, and secure systems to support community services and handle information trustworthily.
Reflection Support for Communities on the WebRalf Klamma
This document describes TeLLNet, a research project that aims to support communities on the web through reflection. It discusses community information systems, modeling community dependencies using the i* framework, analyzing social networks and disturbances in communities, and applying these techniques to case studies of open source software communities and a knowledge network of computer science research. The goal is to help communities better understand themselves and their learning and collaboration processes through reflective social network analysis and visualization tools.
Here are the key steps I would take to design a computer network:
1. Define the goals and needs of the network. What needs to be connected? How many users? What applications and services will be used?
2. Map out the physical layout. Where are devices located? How will they connect - wired or wireless? Design a logical topology to organize devices.
3. Select network hardware. Choose switches, routers, access points suitable for the size and needs. Consider wired/wireless infrastructure requirements.
4. Design the IP addressing scheme. Plan subnetting and IP ranges for efficient use of available addresses.
5. Configure network segmentation. Use VLANs or separate subnets to logically separate traffic as needed for
NetLearn: Social Network Analysis and Visualizations for LearningMohamed Amine Chatti
The most valuable and innovative knowledge is hard to find,
and it lies within distributed communities and networks. Locating the
right community or person who can provide us with exactly the knowledge
that we need and who can help us solve exactly the problems that
we come upon, can be an ecient way to learn forward. In this paper, we
present the details of NetLearn; a service that acts as a knowledge lter
for learning. The primary aim of NetLearn is to leverage social network
analysis and visualization techniques to help learners mine communities
and locate experts that can populate their personal learning environments.
2009-C&T-NodeXL and social queries - a social media network analysis toolkitMarc Smith
This document introduces NodeXL, a network analysis toolkit implemented as an Excel add-in. NodeXL allows users to import social network data, calculate network metrics, and generate network graphs and visualizations within Excel. The document outlines NodeXL's key features, including importing data from sources like email and Twitter, calculating metrics like degree and centrality, and generating customizable node-link diagrams. It also discusses related work and provides an example analysis workflow using NodeXL to analyze an enterprise social network, revealing patterns in employee connections. NodeXL aims to make network analysis accessible to novice and expert users through a familiar spreadsheet interface.
Based on the Blueprint Architectural Design of the City of Weslaco's Multiprotocal Label Switching Fiber Network. A joint team effort between the Weslaco IT Department and SmartCom of McAllen.
Im 2021 tutorial next-generation closed-loop automation - an inside view - ...Ishan Vaishnavi
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
Next-Generation Closed-Loop Automation - an Inside ViewLaurent Ciavaglia
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
IEEE IM 2021 Tutorial - Next-generation closed-loop automation - an inside viewPedro Henrique Gomes
The document provides an overview of next-generation closed-loop automation by three experts - Laurent Ciavaglia from Nokia, Pedro Henrique Gomes from Ericsson, and Ishan Vaishnavi from Lenovo. It introduces the speakers and their backgrounds working on closed-loop automation standards. The tutorial aims to share experience in standards development and present the latest developments in standards and open source towards multi-vendor coordinated closed-loop automation solutions.
Semantic domain ontologies are increasingly seen as the key for enabling
interoperability across heterogeneous systems and sensor-based applications.
The ontologies deployed in these systems and applications are developed by
restricted groups of domain experts and not by semantic web experts. Lately,
folksonomies are increasingly exploited in developing ontologies. The
“collective intelligence”, which emerge from collaborative tagging can be
seen as an alternative for the current effort at semantic web ontologies.
However, the uncontrolled nature of social tagging systems leads to many
kinds of noisy annotations, such as misspellings, imprecision and ambiguity.
Thus, the construction of formal ontologies from social tagging data remains
a real challenge. Most of researches have focused on how to discover
relatedness between tags rather than producing ontologies, much less domain
ontologies. This paper proposed an algorithm that utilises tags in social
tagging systems to automatically generate up-to-date specific-domain
ontologies. The evaluation of the algorithm, using a dataset extracted from
BibSonomy, demonstrated that the algorithm could effectively learn a
domain terminology, and identify more meaningful semantic information for
the domain terminology. Furthermore, the proposed algorithm introduced a
simple and effective method for disambiguating tags.
The Legacy of ROLE - Where are we at the workplace?Ralf Klamma
This slide deck discusses the Responsive Open Learning Environments (ROLE) project. It provides an overview of the ROLE conceptualization of self-regulated learning and technical infrastructure. It then summarizes two case studies that implemented ROLE - the BOOST project which used ROLE to support skills training in businesses, and the VIRTUS project which developed a virtual vocational education system using ROLE. It concludes by discussing the future potential for ROLE in areas like mixed reality environments and domain-specific learning.
Gamification of Community Information SystemsRalf Klamma
SAGE Dissemination Workshop, Sousse, Tunesia, April 2017
Ralf Klamma, Mohammad Abduh Arifin
Advanced Community Information Systems (ACIS)RWTH Aachen University, Germany
klamma@dbis.rwth-aachen.de
The Legacy and the Future of Research Networks in Technology-Enhanced LearningRalf Klamma
Ralf Klamma
Orphée Rendevous 2017, Font Romeu, France
Advanced Community Information Systems (ACIS) RWTH Aachen University, Germany
klamma@dbis.rwth-aachen.de
DevOpsUse for Large-Scale Social Requirements Engineering @ SIG WELL - EC-TEL...Ralf Klamma
This document discusses using DevOps and social requirements engineering for large-scale projects. It introduces the Requirements Bazaar platform for enabling communication between users and developers on requirements. Users can create components, comment, vote and post requirements. DevOps promotes collaboration between stakeholders, automation, and alignment of objectives. The WEKIT project aims to improve maintenance of aircraft using improved documentation and collaboration between maintenance personnel.
Learning Analytics: Trends and Issues of the Empirical Research of the Years ...Ralf Klamma
This document summarizes the findings of a study analyzing empirical learning analytics research from 2011-2014. The study found that most research examined log data from university students to visualize learning trajectories and predict success or failure. However, some innovative studies looked at informal learning communities, video/audio data, automated assessment, and error diagnosis. The document recommends that future learning analytics research incorporate more educational and psychological theories for a deeper understanding of the issues.
A Short Swim through the Personal Learning PoolRalf Klamma
This document discusses different models of learning and tools to support learning. It summarizes several learning cycles including self-regulated learning cycles and organizational learning cycles. It then describes several digital tools developed by the author to support learning, including tools for video annotation, digital storytelling, and interactive 3D anatomy models. Finally, it compares different delivery models for informal learning solutions and discusses trends toward more client-side web architectures.
Scaling up digital learning support for smart workforce development in cluste...Ralf Klamma
4th Research Forum on Small and Medium Sized Enterprises, Chur, Switzerland, February 9-10, 2015
Ralf Klamma & Tobias Ley
RWTH Aachen University, Germany & Tallinn University, Estonia
klamma@dbis.rwth-aachen.de & tley@tlu.ee
Technical Challenges for Realizing Learning AnalyticsRalf Klamma
Technical Challenges for Realizing Learning Analytics
Learntec 2015, January 28, 2015, Karlsruhe, Germany,
Ralf Klamma
Advanced Community Informations Systems (ACIS) Group
RWTH Aachen University
Technology-Enhanced Learning at the Workplace – From islands of automation to...Ralf Klamma
Technology-Enhanced Learning at the Workplace – From islands of automation to broad deployment of informal learning in small and medium sized enterprises
Invited Talk - Siegen, January 20, 2015
Ralf Klamma, RWTH Aachen
Advanced Community Information Systems Group (ACIS)
The document provides an annual report for the Advanced Community Information Systems (ACIS) group at RWTH Aachen University from October 2013 to September 2014. It summarizes the group's research projects, achievements, community activities, software demonstrations, publications, and theses completed during this period. The group conducted research on mobile community information systems and technology enhanced learning, involved in community services like editorial boards and conference organization, and engaged in open source software development.
Blueprint for Software Engineering in Technology Enhanced Learning ProjectsRalf Klamma
Blueprint for Software Engineering in Technology Enhanced Learning Projects
Ralf Klamma, Michael Derntl, István Koren, Petru Nicolaescu, Dominik Renzel
RWTH Aachen University Advanced Community Information Systems (ACIS) Aachen, Germany
klamma@dbis.rwth-aachen.de
9th European Conference on Technology Enhanced Learning (EC-TEL 2014)
September 18-21, 2014
Graz, Austria
Navigation Support in Evolving Communities by a Web-based DashboardRalf Klamma
This document discusses the development of a navigation dashboard to support the evolution of open source software communities. It describes related work on social network analysis and text mining of communities. A survey of open source developers found interest in visualizing the overall community and changes over time through metrics and network graphs. A prototype dashboard was created integrating data from code repositories and mailing lists of three bioinformatics projects. Feedback from community members praised the social network graph and saw potential uses for recruitment, funding, and comparing projects. The conclusions identify interest in reflecting community evolution and network visualizations, with an outlook on expanding text analysis and social features to better support open source communities.
The document discusses big data and learning analytics. It notes the changing roles of researchers from isolated scientists to members of networked communities. It raises ethical concerns about privacy with the collection and analysis of large datasets. The document also discusses lessons learned about ensuring transparency, accountability, and community involvement in the use of data and analytics.
Advanced Community Information Systems Group (ACIS) Annual Report 2013Ralf Klamma
Advanced Community Information Systems (ACIS)
Lehrstuhl Informatik 5 – Information Systems
RWTH Aachen University
Ahornstr. 55 | 52056 Aachen | Germany
Community Learning Analytics - Challenges and Opportunities - ICWL 2013 Invit...Ralf Klamma
Community Learning Analytics –Challenges and Opportunities
Invited Talk ICWL 2013, Kensing, Taiwan, October 7, 2013
Ralf Klamma
Advanced Community Information Systems (ACIS)
RWTH Aachen University, Germany
klamma@dbis.rwth-aachen.de
Supporting Professional Communities in the Next Web Ralf Klamma
Keynote
PWM Wissenstag Social Enterprise @ I-KNOW 2013
Wednesday, September 4, 2013 in Graz (Austria)
Ralf Klamma
Advanced Community Information Systems (ACIS)
RWTH Aachen
Robust Expert Finding in Web-Based Community Information SystemsRalf Klamma
Robust Expert Finding in Web-Based Community Information Systems
Ralf Klamma
Advanced Community Information Systems (ACIS)RWTH Aachen University, Germany
EC-TEL 2013
8th European Conference on
Technology Enhanced Learning
“Scaling Up Learning for Sustained Impact”
17-21 September 2013, Paphos, Cyprus
Call for Sponsors
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Discover top-tier mobile app development services, offering innovative solutions for iOS and Android. Enhance your business with custom, user-friendly mobile applications.
High performance Serverless Java on AWS- GoTo Amsterdam 2024Vadym Kazulkin
Java is for many years one of the most popular programming languages, but it used to have hard times in the Serverless community. Java is known for its high cold start times and high memory footprint, comparing to other programming languages like Node.js and Python. In this talk I'll look at the general best practices and techniques we can use to decrease memory consumption, cold start times for Java Serverless development on AWS including GraalVM (Native Image) and AWS own offering SnapStart based on Firecracker microVM snapshot and restore and CRaC (Coordinated Restore at Checkpoint) runtime hooks. I'll also provide a lot of benchmarking on Lambda functions trying out various deployment package sizes, Lambda memory settings, Java compilation options and HTTP (a)synchronous clients and measure their impact on cold and warm start times.
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectorsDianaGray10
Join us to learn how UiPath Apps can directly and easily interact with prebuilt connectors via Integration Service--including Salesforce, ServiceNow, Open GenAI, and more.
The best part is you can achieve this without building a custom workflow! Say goodbye to the hassle of using separate automations to call APIs. By seamlessly integrating within App Studio, you can now easily streamline your workflow, while gaining direct access to our Connector Catalog of popular applications.
We’ll discuss and demo the benefits of UiPath Apps and connectors including:
Creating a compelling user experience for any software, without the limitations of APIs.
Accelerating the app creation process, saving time and effort
Enjoying high-performance CRUD (create, read, update, delete) operations, for
seamless data management.
Speakers:
Russell Alfeche, Technology Leader, RPA at qBotic and UiPath MVP
Charlie Greenberg, host
Essentials of Automations: Exploring Attributes & Automation ParametersSafe Software
Building automations in FME Flow can save time, money, and help businesses scale by eliminating data silos and providing data to stakeholders in real-time. One essential component to orchestrating complex automations is the use of attributes & automation parameters (both formerly known as “keys”). In fact, it’s unlikely you’ll ever build an Automation without using these components, but what exactly are they?
Attributes & automation parameters enable the automation author to pass data values from one automation component to the next. During this webinar, our FME Flow Specialists will cover leveraging the three types of these output attributes & parameters in FME Flow: Event, Custom, and Automation. As a bonus, they’ll also be making use of the Split-Merge Block functionality.
You’ll leave this webinar with a better understanding of how to maximize the potential of automations by making use of attributes & automation parameters, with the ultimate goal of setting your enterprise integration workflows up on autopilot.
What is an RPA CoE? Session 1 – CoE VisionDianaGray10
In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
• The role of a steering committee
• How do the organization’s priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
"$10 thousand per minute of downtime: architecture, queues, streaming and fin...Fwdays
Direct losses from downtime in 1 minute = $5-$10 thousand dollars. Reputation is priceless.
As part of the talk, we will consider the architectural strategies necessary for the development of highly loaded fintech solutions. We will focus on using queues and streaming to efficiently work and manage large amounts of data in real-time and to minimize latency.
We will focus special attention on the architectural patterns used in the design of the fintech system, microservices and event-driven architecture, which ensure scalability, fault tolerance, and consistency of the entire system.
LF Energy Webinar: Carbon Data Specifications: Mechanisms to Improve Data Acc...DanBrown980551
This LF Energy webinar took place June 20, 2024. It featured:
-Alex Thornton, LF Energy
-Hallie Cramer, Google
-Daniel Roesler, UtilityAPI
-Henry Richardson, WattTime
In response to the urgency and scale required to effectively address climate change, open source solutions offer significant potential for driving innovation and progress. Currently, there is a growing demand for standardization and interoperability in energy data and modeling. Open source standards and specifications within the energy sector can also alleviate challenges associated with data fragmentation, transparency, and accessibility. At the same time, it is crucial to consider privacy and security concerns throughout the development of open source platforms.
This webinar will delve into the motivations behind establishing LF Energy’s Carbon Data Specification Consortium. It will provide an overview of the draft specifications and the ongoing progress made by the respective working groups.
Three primary specifications will be discussed:
-Discovery and client registration, emphasizing transparent processes and secure and private access
-Customer data, centering around customer tariffs, bills, energy usage, and full consumption disclosure
-Power systems data, focusing on grid data, inclusive of transmission and distribution networks, generation, intergrid power flows, and market settlement data
[OReilly Superstream] Occupy the Space: A grassroots guide to engineering (an...Jason Yip
The typical problem in product engineering is not bad strategy, so much as “no strategy”. This leads to confusion, lack of motivation, and incoherent action. The next time you look for a strategy and find an empty space, instead of waiting for it to be filled, I will show you how to fill it in yourself. If you’re wrong, it forces a correction. If you’re right, it helps create focus. I’ll share how I’ve approached this in the past, both what works and lessons for what didn’t work so well.
Introduction of Cybersecurity with OSS at Code Europe 2024Hiroshi SHIBATA
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Conversational agents, or chatbots, are increasingly used to access all sorts of services using natural language. While open-domain chatbots - like ChatGPT - can converse on any topic, task-oriented chatbots - the focus of this paper - are designed for specific tasks, like booking a flight, obtaining customer support, or setting an appointment. Like any other software, task-oriented chatbots need to be properly tested, usually by defining and executing test scenarios (i.e., sequences of user-chatbot interactions). However, there is currently a lack of methods to quantify the completeness and strength of such test scenarios, which can lead to low-quality tests, and hence to buggy chatbots.
To fill this gap, we propose adapting mutation testing (MuT) for task-oriented chatbots. To this end, we introduce a set of mutation operators that emulate faults in chatbot designs, an architecture that enables MuT on chatbots built using heterogeneous technologies, and a practical realisation as an Eclipse plugin. Moreover, we evaluate the applicability, effectiveness and efficiency of our approach on open-source chatbots, with promising results.
AppSec PNW: Android and iOS Application Security with MobSFAjin Abraham
Mobile Security Framework - MobSF is a free and open source automated mobile application security testing environment designed to help security engineers, researchers, developers, and penetration testers to identify security vulnerabilities, malicious behaviours and privacy concerns in mobile applications using static and dynamic analysis. It supports all the popular mobile application binaries and source code formats built for Android and iOS devices. In addition to automated security assessment, it also offers an interactive testing environment to build and execute scenario based test/fuzz cases against the application.
This talk covers:
Using MobSF for static analysis of mobile applications.
Interactive dynamic security assessment of Android and iOS applications.
Solving Mobile app CTF challenges.
Reverse engineering and runtime analysis of Mobile malware.
How to shift left and integrate MobSF/mobsfscan SAST and DAST in your build pipeline.
The Department of Veteran Affairs (VA) invited Taylor Paschal, Knowledge & Information Management Consultant at Enterprise Knowledge, to speak at a Knowledge Management Lunch and Learn hosted on June 12, 2024. All Office of Administration staff were invited to attend and received professional development credit for participating in the voluntary event.
The objectives of the Lunch and Learn presentation were to:
- Review what KM ‘is’ and ‘isn’t’
- Understand the value of KM and the benefits of engaging
- Define and reflect on your “what’s in it for me?”
- Share actionable ways you can participate in Knowledge - - Capture & Transfer
The Microsoft 365 Migration Tutorial For Beginner.pptxoperationspcvita
This presentation will help you understand the power of Microsoft 365. However, we have mentioned every productivity app included in Office 365. Additionally, we have suggested the migration situation related to Office 365 and how we can help you.
You can also read: https://www.systoolsgroup.com/updates/office-365-tenant-to-tenant-migration-step-by-step-complete-guide/
The Microsoft 365 Migration Tutorial For Beginner.pptx
The MediaBase
1. Informatik 5 (DBIS),
RWTH Aachen University
TeLLNet
GALA
The MediaBase
Ralf Klamma
Webinar
December 16, 2010
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-1
2. TeLLNet
GALA
The Overall Approach
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-2
3. What is unique about
the MediaBase?
Interdisciplinary multidimensional model of digital networks
– Social network analysis (SNA) is defining measures for social
TeLLNet Community
relations
GALA
– Actor network theory (ANT) is connecting human and media agents
– I* framework is defining strategic goals and dependencies
– Theory of media transcriptions is studying cross-media knowledge
social software Media Networks network of artifacts
Wiki, Blog, Podcast, IM, Chat, Microcontent, Blog entry, Message, Burst, Thread,
Email, Newsgroup, Chat … Comment, Conversation, Feedback (Rating)
i*-Dependencies
(Structural, Cross-media)
network of members
Lehrstuhl Informatik 5
Members
(Social Network Analysis: Centrality,
(Informationssysteme)
Prof. Dr. M. Jarke
Efficiency)
Communities of practice
I5-KL-111010-3
4. Modeling Dependencies
Using the i* Framework
Coordination Iterant
Coordinator
Broker
TeLLNet
GALA isA
isA
isA
Member Gatekeeper Artifact
isA
URL
Hub
Legend:
Agent
Goal
Communication
Network
Resource
Lehrstuhl Informatik 5 Task
(Informationssysteme)
Prof. Dr. M. Jarke
Eric S. K. Yu, Towards Modeling and Reasoning Support for Early-Phase Requirements Engineering, RE 1997
I5-KL-111010-4
5. What can you do with the Mediabase
Community Interface for (Firefox Plugin)
– Adding media for crawling, searching & viewing
TeLLNet
GALA
– Observing social networks over time
– Retrieving structural patterns of media
– Applying Web 2.0 operations (tagging, etc.) on media
Writing your own crawlers
Applying all kind of social network measures
– Centrality measures – Finding influential & powerful persons
– Network statistics – Understand networks at large
Advanced queries in RDF Store on concepts and relations
– Who is the owner of company x?
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke – Structured input for conceptual mapping tools
I5-KL-111010-5
6. What is the MediaBase?
Collection of Social Software artifacts:
TeLLNet Mailing lists (>200 k) Wikipedias
GALA Blogs (>300 k) RSS Feeds
Websites Forums
Newsletters …
The MediaBase
• IBM DB 2 data store
• 24/7 Perl crawlers for media artifacts
• Community oriented Commander Interface
• Social network analysis & visualization tools
Lehrstuhl Informatik 5
• PALADIN: A pattern language for automatic behavior detection
Automatic extraction of concepts and relations in RDF
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-6
•
7. TeLLNet
GALA
The Data Model
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-7
8. MediaBase Model
TeLLNet
A Mediabase is a six-tuple graph
GALA
M = (A, R, µ , ν , η , L)
R ⊆ A×A
µ :A → L
ν :R → L
η : R → {0, 1}
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-8
9. Simplified Meta Model
Attribute has Actor
TeLLNet
GALA
isA
Medium Artifact Process Agent Community
isA
stores creates is affected by belongs go
represents consumes performs ranks
Lehrstuhl Informatik 5
Browse Address Transcribe … Localize
(Informationssysteme)
Prof. Dr. M. Jarke
Latour: On Recalling ANT, 1999
I5-KL-111010-9
11. Medium – Artifact Compatibility
Mailing Transaction- Chat
Email Blog Wiki URL Forum
TeLLNet List based Website Room
GALA
Message + + - - - - - +
Thread - + - - + - - +
Burst + + + + + - - +
Conversation - - - - - + - +
Blog Entry - - + - - - - -
Comment - - + + + - - +
Web Page - - - - + - + -
Transaction - - - + - - - -
Feedback - - - + - - - +
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-11
12. TeLLNet
GALA
The Crawlers
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-12
13. Crawling Technologies
Mix of dumps (Wikis) and special purpose crawlers:
TeLLNet
GALA W = Media ∪ Artifact
I = Media ∪ Artifact ∪ Process ∪ Agent
G = Media ∪ Artifact ∪ Process ∪ Agent ∪ Network
MW = Mailing list ∪ Message ∪ Thread ∪ Index
Lehrstuhl Informatik 5
(Informationssysteme)
BW = Blog ∪ Blogroll ∪ Blogentry ∪ Comment ∪ Index
Prof. Dr. M. Jarke
I5-KL-111010-13
14. Crawler Overview
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-14
15. Website Crawler
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-15
16. Feed Crawler
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-16
17. Mailinglist Crawler
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-17
18. News Crawler
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-18
19. Podcast Crawler
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-19
20. TeLLNet
GALA
The MediaBase Commander
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-20
21. Media Base Web 2.0 Commander
Personalization (user annotates resources with tags and has his page)
Community-awareness (resources and annotation of others are open)
TeLLNet
User-friendly interface (Firefox plug-in, easy insertion of resources, tags, tracking of
GALA
recent changes)
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-21
22. Application Programmer Interfaces
Under Development
TeLLNet
– GraphService – Visualization and PALADIN
GALA
– http://dbis.rwth-
aachen.de/~atlas/module_build/JavaDoc//atlas_las_services_gr
aph-service/HEAD/javadoc/index.html
– TargETLy Service – RDF Data Generator
– http://dbis.rwth-
aachen.de/~atlas/module_build/JavaDoc/atlas_theses_da_kren
ge_TargETLy2/HEAD/javadoc/index.html
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-22
23. GraphService
AbstractDigitalNetwork – Representation of
TeLLNet MetaModel
GALA
Classes for Networks – Blogs, Mailinglists, etc.
Classes for Basic SNA
Classes for Pattern Analysis
Classes for GraphLayout
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-23
24. TargETLy Service
Connection to RDF Store
OpenCalais Service – RDF Generator
TeLLNet
GALA
Pattern Analysis
IntentAnalysis
Collection of predefined RDF Queries
– e.g. companyCompetitor, companyEmployeeNumber
– e.g. patentFiling, patentIssuance
– e.g. personEmailAddress, creditRating
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-24
25. TeLLNet
GALA
PALADIN – Pattern Analysis
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-25
26. PALADIN: Disturbances in
Cross-media Social Networks
What is a disturbance?
TeLLNet – Sensing an incompatibility
GALA between theories exposed
and theories-in-use
Disturbances are starting
points of learning processes
– Disturbances disturb,
prevent … but they are
creating reflection
Disturbances are hard to
detect or to forecast
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-26
27. Pattern Language for PALADIN:
Example Troll
Troll Pattern: This pattern tries to discover the cases when a troll exists in a digital social
network. A troll in the network is considered a disturbance.
TeLLNet
Disturbance:
GALA
(EXISTS [medium | medium.affordance = threadArtefact]) &
(EXISTS [troll |(EXISTS [thread | (thread.author = troll) &
(COUNT [message | (message.author = troll) &
(message.posted = thread)]) > minPosts]) &
(~EXISTS[ thread1, message1| (thread1.author1 != troll) &
(message1.author = troll & message1.posted = thread1 ]))])])
Forces: medium; troll; network; member; thread; message; url
Force Relations: neighbour(troll, member); own thread(troll, thread)
Solution: No attention must be paid to the discussions started by the troll.
Rationale: The troll needs attention to continue its activities. If no attention is paid, he/she
Lehrstuhl Informatik 5
will stop participating in the discussions.
Pattern Relations: Associates Spammer pattern.
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-27
28. Pattern Discovery Process
Pattern 1. Set pattern Pattern Template
parameters Disturbance
Disturbance
Variables Pattern
TeLLNet 4a. Variables Parameters
Change
GALA Pattern Instance Pattern
Parameters
Disturbance Digital Social Network 2. Instantiate
disturbances
4b. Apply
Variables Pattern Pattern Solution
Parameters
Pattern Template Instance
Forces Force
Relations
Disturbance Instances
Description Solution
Variables Pattern
Parameters
Rationale
Dependencies 3. Evaluate
disturbances
Lehrstuhl Informatik 5
(Informationssysteme) Pattern Relations
Prof. Dr. M. Jarke
I5-KL-111010-28
29. PALADIN Case Study
10 patterns of disturbance over 119 social network instances,
TeLLNet 17359 individuals, 215 345 mails
GALA Pattern Occurrences Remarks
Burst 22 The pattern finds out topics which were very important for certain
period of time. Scalability is necessary.
No Conversationalist 76 The existence implies little communication in the network.
No Questioner 67 The existence implies that the network is not popular.
No Answering Person 61 Occurs in small networks. The effects of the lack of an answering
person must be further checked with content analysis.
Troll 2 Troll occurs very rarely in cultural communities. True negatives exist.
Spammer 86 Spammers can be found often in discussion groups. False positives
exist.
Leader 37 The pattern occurs in the network centered around a member.
No Leader 40 Occurs in big networks where the members are distributed in
different clusters.
Structural Hole 67 Occurs for members having neighbors with only one contact.
Lehrstuhl Informatik 5
(Informationssysteme) Independent 13 Occurs in large networks where disconnected subnetworks exist.
Prof. Dr. M. Jarke
I5-KL-111010-29
Discussions Scalability is necessary.
30. TeLLNet
GALA
Visualization & Analysis
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-30
31. Social Network Analysis of
Open Source Communities
Eclipse components network based on analysis of
TeLLNet source code repository (Software Architecture)
GALA
Eclipse components network based on analysis of
mailing list communication (Social Structure)
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-31
32. Community Reflection about
Development Process
TeLLNet
GALA
Social platform: Eclipse forum eclipsezone
Forum: Eclipse communication framework (ECF)
Measure: degree centrality
Lehrstuhl Informatik 5
(Informationssysteme)
Statistics: 225 nodes, 283 edges
Prof. Dr. M. Jarke
I5-KL-111010-32
33. Conversationalist Pattern
Social platform: Eclipse mailing list
TeLLNet
Forum: Device debugging developer discussion
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-33
34. Questioner Pattern
Social platform: Eclipse mailing list
TeLLNet
Forum: Device debugging developer discussion
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-34
35. Identification of End-Users and
Developers in OSS Communities
Community
TeLLNet Clustering
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-35
36. Textual Analysis of Postings from
Community Experts
TeLLNet
GALA
Postings from experts
of one of the identified
communities
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-36
37. Computer Science Knowledge Network:
the Visualization
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-37
38. Computer Science Knowledge Network:
Clustering
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-38
39. Interdisciplinary Venues:
Top Betweenness Centrality
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-39
40. High Prestige Series:
Top PageRank
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-40
41. Data Sets
DBLP (http://www.informatik.uni-trier.de/~ley/db/)
- 788,259 author’s names
TeLLNet
- 1,226,412 publications
GALA
- 3,490 venues (conferences, workshops, journals)
CiteSeerX (http://citeseerx.ist.psu.edu/)
- 7,385,652 publications (including publications in reference lists)
- 22,735,240 citations
- Over 4 million author’s names
Combination
- Canopy clustering [McCallum 2000]
- Result: 864,097 matched pairs
- On average: venues cite 2306 and
are cited 2037 times
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-41
42. WikiWatcher – System Design
Stage 1: SAX-based Parser in PERL Wiki Network Data
TeLLNet Authors
Generating XML Parsing wiki data/
GALA dump/export files database transfer Article pages, Joe
URLS,
Revisions Liz
article Tim
[[Article]]
RDB
[[requested]]
123.45.67.89
Stage 2: Dynamic Analysis and Visualization
article
[http://…]
[[Article2]]
Generating Networks Measurement [[never exists]]
Metadata
Lehrstuhl Informatik 5
(Informationssysteme) Visualization Network Analysis
Prof. Dr. M. Jarke
I5-KL-111010-42
43. Network Heterogeneity
Author Networks
TeLLNet – Author nodes
GALA (anonymous/registered users)
– Edges represent collaboration
between authors during
a period t
Article Networks
– Article nodes
(incl. wiki namespaces)
– Directed edges (links)
between articles
Lehrstuhl Informatik 5
(Informationssysteme)
As expected both kind of
Prof. Dr. M. Jarke
I5-KL-111010-43 networks stay heterogenous
44. Importance of Network Actors
Articles: High betweenness
TeLLNet centrality controls the flow of
GALA information within a Wiki
Betweenness values grow
up or stay nearly constant
during the evolution process
Determines
– Important actors
– Important articles
– Vandalism
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-44
45. Evolution of Shortest Paths
Densification Power Law:
TeLLNet Complex networks may
GALA become denser
during their growth
Generally this could not
verified for wiki author
networks!
The average distances
stagnate at nearly 2 for all
considered author networks
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-45
46. Evolution of Author Networks
Strongly connected components merged by collaboration of
two wiki authors
TeLLNet
GALA
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke Author Network of German Wikia in July 2007 Author Network of German Wikia in August 2007
I5-KL-111010-46
47. TeLLNet
GALA
Visualization & Analysis
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-47
48. What you cannot do with the
Mediabase (in the moment )
Creating a new Mediabase in a new environment
TeLLNet
– Maintenance with databases, scripts and interfaces is tedious
GALA – Interfaces integrated into Zope/Plone
Not all media are equally supported
– Very good support for mailing lists, forums, web sites and blogs
– Less support for wikis, podcasts, social bookmarks
Lacking support for
– Conceptual navigation interface (Conzilla!)
– Discourse management tools
– Weak signal analysis tools
– Topic & sentiment & opinion mining tools
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke – Automatic generation of recommendations
I5-KL-111010-48
49. The Future of the Mediabase:
CommunityBase
TeLLNet
GALA Activity Theory
[Enge87]
Actor Network Self- Community Self-
Theory [Lato05] modeling experience reflection
repository
Community of
Practice [Weng98]
+
disturbance +/- -
disturbance disturbance
[PeKl08]
Lehrstuhl Informatik 5
(Informationssysteme)
Prof. Dr. M. Jarke
I5-KL-111010-49
Self-modeling phase contributes to self-reflection phase and vice versa