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Evaluating a forthcoming international bibliographic research database in form of a Zotero group
(2014)
Purpose – In order to connect the various international research hubs on physical learning spaces, a large-scale research database has been developed, using a Zotero group. Hitherto, its interface and collection index has never been examined for usability. This pilot study attempts to discover what retrieval strategy combinations users apply in the Zotero web interface, and how satisfied they are with the usability and the retrieval outcomes. The results shall not just generate ideas for the improvement of the studied database, but also provide inspiration for similar Zotero projects. Design/methodology/approach – This pilot study is designed as a qualitative field study. A sample of the project is actual target group was contacted around Copenhagen, Denmark. During a home- or office-visit, a natural search task was defined and executed by the participant on a laptop provided by the instructor. Using TechSmiths Morae usability software, screen, webcam, and voice data was recorded and analyzed; after the recording, a usability survey was filled out. Findings – Despite only two samples, the participants use and judge the three search methods of Zotero differently. Most participants favor the free text search method (1), although the retrieval results are unsatisfactory. In a large-scale, multi-language collection, like the assessed database, browsing in hierarchical categories (2), or faceting results using a tag cloud (3) may be more effective and efficient, but only a minority of participants understands and applies these methods. Furthermore, it appears that the interface lacks intuitive navigation, especially for the non-scientific community. Novice Zotero users not familiar with the concepts of bibliographic databases may fail to differentiate between the Zotero website (the service provider) and the Zotero group (the database, the actual subject of the study). Originality/value – This is the first published usability study of a large-scale Zotero group. It introduces usability issues, regarding search functions and web interface. Besides drawing inspiration from a similar Zotero bibliography, which uses RSS feeds and API interfaces, a few practical ways to enhance user search experience are suggested. The pilot study concludes with suggestions for further research, designed for more reliable participant scales.
The publication culture on Urban Agriculture (UA) is nearly exclusively inhabited by idealist and practitioner proponents. Foremost the economics (oftentimes influenced by Marxism) dare to critique the sustainability of the movement. In short, the people that start a UA project eventually require help from their city through recognition and policy support. The full breadth of intentions of these people are principally unknown, and this hinders policy design, in turn. Investigating these rationales (using Skot-Hansens Five Es (2005)) is the scope of this paper. It identifies a number of necessary policy changes, but ultimately pinpoints that it requires the involvement of activists, NGOs, and individual UA champions to raise awareness and to participate in policy design and implementation. It is found that, in one or the other way, most UA proponents motives can be traced back to a facet of community empowerment. Amongst the variety of rationales, especially the non-capitalist culture of UA is said to further its sustainability (not just in economic terms), because it brings forth a culture that embodies the said empowerment and shapes a democratic, inclusive sharing community. Hence, UA is identified as a strategy for urban cultural regeneration.
In order to publish Linked Open Data, the source data has to be prepared. This term paper introduces basic procedures of this publishing process. The focus is on the theoretical process of publishing, aspects of technical realization of this process through different approaches and the description of a first attempt to put the publishing process into practice with some sample data.
The goal of this thesis is to develop a novel type of virtual heritage medium that utilises the combined immersive and engaging potentials of interactive mixed reality environments and spatial narratives. Concretely, this is achieved through depth-sensitive compositing of real-time 3D content into the live-video of a tracked smartphone. The user can explore this mixed reality environment, watch the actions of staged 3D characters as well as interact with them and virtual artifacts. This medium would therefore provide possibilities for telling stories in direct context with existing environments along with an immersive and engaging media experience. This work will mainly focus on how this medium can be used as an edutainment medium in sites of cultural heritage. This thesis will focus on establishing the technical requirements and realisation possibilities for implementation in Unity on iPhone 5 / iOS 7. Subsequently, a prototype is implemented in order to prove the research results.
With the increasing use of visual effects in feature films, TV series and commercials, flexibility becomes essential to create astonishing pictures while meeting tight production schedules. Deep image compositing introduces new possibilities that increase flexibility and solve old problems of depth based compositing. The following thesis gives an introduction to deep image compositing, illustrating its power and analyzing its use in a modern visual effects pipeline.
Websites or web applications, whether they represent shopping systems, on demand services or a social networks, have something in common: data must be stored somewhere and somehow. This job can be achieved by various solutions with very different performance characteristics, e.g. based on simple data files, databases or high performance RAM storage solutions. For todays popular web applications it is important to handle database operations in a minimum amount of time, because they are struggling with a vast increase in visitors and user generated data. Therefore, a major requirement for modern database application is to handle huge data (also called big data) in a short amount of time and to provide high availability for that data. A very popular database application in the open source community is MySQL, which was originally developed by a swedisch company called MySQL AB and is now maintenanced by Oracle. MySQL is shipped in a bundle with the Apache web server and therefore has a large distribution. This database is easily installed, maintained and administrated. By default MySQL is shipped with the MyISAM storage engine, which has good performance on read requests, but a poor one on massive parallel write requests. With appropriate tuning of various database settings, special architecture setups (replication, partitioning, etc.) or other storage engines, MySQL can be turned into a fast database application. For example Wikipedia uses MySQL for their backend data storage. In the lecture Ultra Large Scale Systems and System Engineering teached by Walter Kriha at Media University Stuttgart, the question Can a MySQL database application handle more then 3000 database requests per second? came up some time. Inspired by this issue, I got myself going to find out, if MySQL is able to handle such a amount of requests per second. At that time I also read something about the high availability and scalability solution MySQL Cluster and it was the right time to test the performance of that solution. In this paper I describe how to set up a MySQL database server with the additional MySQL Cluster storage engine ndbcluster and how to configure a database cluster. In addition I execute some database tests on that cluster to proof that its possible the get a throughput of >= 3000 read requests per second with a MySQL database.
Secure Search
(2011)
Nowadays it is easy to track web users among websites: cookies, web bugs or browser fingerprints are very useful techniques to achieve this. The data collected can be used to derive a specific user profile. This information can be used by third parties to present personalized advertisements while surfing the web. In addition a potential attacker could monitor all web traffic of an user e.g. its search queries. As a conclusion the attacker knows the intentions of the web user and of the company he is working for. As competitors maybe very interested in such information, this could lead to a new form of industrial espionage. In this paper I present some of the techniques commonly used. I illustrate some problems caused by the usage of insecure transmission lines and compromised search engines. Some camouflage techniques presented may help to protect the web users identity. This paper is a based on the lecture "Secure Systems" teached by Professor Walter Kriha at the Media University (HdM) Stuttgart.
This paper gives an overview of the advantages and weaknesses of distributed source code review tools in software engineering. We cover this topic with a specific focus on Google’s freely available software Gerrit. In chapter 1 we discuss how code-reviews are generally useful for groups of programmers. We lay out how traditional approaches differ from distributed setups where developers may be vastly distributed from a geographical point of view or where meetings are otherwise contraindicated. In chapter 2 we discuss how users can interact with Gerrit, and chapter 3 covers some basic knowledge for those people who have to administer one or more Gerrit installations. Finally, chapter 4 summarizes key points and gives an outlook on the future role of distributed code-review.
The Eclipse rich client platform as container for componentoriented plugins provides a framework to host plugins, which concerning its look and feelembed well in a client workstation. J2EE client container provide a runtime environment for applications, integrated in a multitier architecture and therefore have to access services Java 2 Enterprise Edition (J2EE). Combining the two container approaches will create a new runtime environment for application clients, which appear in the user interface style of Eclipse and are able to take up the J2EE services. This diploma thesis discusses concepts of combining Eclipse and the client container.
This report offers a survey of the methods that are being deployed at leading digital libraries to assess the use and usability of their online collections and services. Focusing on 24 Digital Library Federation member libraries, the study's author, Distinguished DLF Fellow Denise Troll Covey, conducted numerous interviews with library professionals who are engaged in assessment. The report describes the application, strengths, and weaknesses of assessment techniques that include surveys, focus groups, user protocols, and transaction log analysis. Covey's work is also an essential methodological guidebook. For each method that she covers, she is careful to supply a definition, explain why and how libraries use the method, what they do with the results, and what problems they encounter. The report includes an extensive bibliography on more detailed methodological information, and descriptions of assessment instruments that have proved particularly effective.