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Virtual-reality (VR) is an immersive technology with a growing market and many applications for gesture recognition. This thesis presents a VR gesture recognition method using signal processing techniques. The core concept is based on the comparison of motion features in the form of signals between a runtime recording of users and a possible gesture set. This comparison yields a similarity score through which the most similar gesture can be recognized by a continuous recognition system. Some selected comparison methods are presented, evaluated and discussed. An example implementation is demonstrated. However, due to an introduced layer model parts of the method and its implementation are interchangeable.
Similar or even better performance is achieved compared to other related work. The comparison method Dynamic Time Warping (DTW) reaches an average positive recognitions rate of 98.18% with acceptable real-time application performance. Additionally, the method comes with some benefits: position and direction of users is irrelevant, body proportions have no significant negative impact on recognition rates, faster and slower gesture executions are possible, no user inputs are needed to communicate gesture start and end (continuous recognition), also continuous gestures can be recognized, and the recognition is fast enough to trigger gesture specific events already during the execution.
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.
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.
This study investigates the possibility of using Bartle’s player types for gamification
in the context of language learning apps. By taking user preferences into
account, this might assist in selecting the most suitable game elements. Learning
apps are gaining popularity as an innovative method for obtaining an independent
and flexible learning experience. Gamification keeps users motivated and involved
with the content.
After the research on the usage of gamification and its effects on the user, a language
learning app prototype was created. The evaluation consisted of a user test with
interview questions and the short User Experience Questionnaire (UEQ). The Bartle
test of gamer psychology was used to determine the player types of the participants.
The results show that, while player type and gamification preference can partially
coincide, there are too many deviations to confidently say it can be transferred into
gamification contexts. We conclude that game elements should not be chosen based
on a user’s Bartle player type and are more effectively used by incorporating a variety
of different gamification components.
Climate change is one of the greatest societal challenges of our time. The global food production alone accounts for 26% of global greenhouse gas emissions. Without dietary changes, the challenges of climate protection can hardly be achieved in the food sector. Technology has the ability to significantly change society and it can be used to change people’s attitude or behaviors.
The current study investigated the potential of using Persuasive Technology for guiding consumers to implement sustainable food choices. To evaluate its impact, an online grocery store was designed and prototyped using the Persuasive Systems Design model according to Oinas-Kukkonen and Harjumaa. The intended target behavior was to adjust food choices and make sustainable consumption decisions. The target group consisted of individuals between the ages 20 and 34 years.
The iterative approach of the empirical study was divided into four parts: First, the requirements of the target group were analyzed. Then a concept of the grocery online shop was developed using the design principles of the Persuasive Systems Design model. The concept Foodprint was prototypically implemented and consequently, evaluated via A/B testing with target users. Two high-fidelity prototypes were similarly structured with the only difference that Prototype A contained persuasive elements. Prototype B was intended to collect comparative data in the user tests. Ten individuals of the target group evaluated the prototypes and their impressions of the concept and food choices were examined to assess the impact of the Persuasive Systems Design model.
The data were analyzed qualitatively as well as quantitatively. Prototype A – with the persuasive elements – showed a more positive user experience. The evaluation of tests A and B revealed that the persuasive elements were able to influence users to identify sustainable food options.
In general, it can be concluded that testers from both tests, A and B, rated the grocery online store as helpful and would be willing using it in the future. However, it became also evident that the target group lacked knowledge to make informed decisions about the environmental impact of their food choices. As observed in the current study, the participants considered it difficult to assess the sustainability level of foods when grocery shopping. Their purchasing decisions relied on labels and erroneous assumptions. These observations indicate the need for more support in making sustainable food choices.
The Persuasive Systems Design model had the potential to influence the users in their food choices, suggesting that it may be an option to contribute to environmental protection in the food sector. Over time, consumers may even become more aware of the impact of their food choices and hence, could adjust their purchasing behavior in stationary retail stores.
Web Accessibility is becoming increasingly important. Guidelines and according tests were created in order to ensure Web Accessibility for everyone. Detailed reports are created in order to advise content creators on this topic. However, these reports can be even more elaborate than the guidelines themselves with their very specific and technical vocabulary and their sheer length. This makes it hard, especially for non-experts, to understand what the results mean and to know where to start.
StroCards is a functional prototype developed to help viewers of Web Accessibility reports understand their contents easier. One way of doing this is by sorting and filtering identified accessibility issues. It can generate charts from the number of failed, passed and not applicable success criteria that highlight aspects that are not explained in the report itself. It can explain the user how well each of the tested website performs in terms of accessibility regarding different responsibilities. One of its key features is generating individual reports for individual responsibilities like e.g. visual design. With this functionality a designer like in this example, could receive a list of issues that are relevant to them without being overwhelmed by issues that they cannot solve. This creates a more efficient handling of the report. Besides displaying the report highlighting project roles, StroCards can have a more human-centered and empathetic approach by showing which user groups are affected and therefore excluded by accessibility issues on the website. This makes the long list of guidelines more tangible – especially for non-experts.
In the process of developing StroCards, some design decisions were made with a group of experts. The implemented functional prototype was tested in a qualitative and quantitative user study. It was perceived as easier to understand and better to work with.
A tool like this could wildly help people maintaining, creating, and developing websites to put these Web Accessibility guidelines into practice and consequently minimize exclusion of people from websites.
Innovative architecture and networks for learner-centred, local education and life-long-learning are receiving growing attention. Yet, practitioners still require practical guidance, given the challenge of involving and interacting with new and diverse stake-holder groups, such as architects and politicians, or the community at large. With the goal of advancing scientific and practical frameworks, this thesis approaches how stakeholders in ‘education-centred urban development’ (ECUD) can be helped to accomplish mutual understanding and more effective communication and interaction during planning.
Assuming the organizational theory of ‘networked governance’ (NG), a literature re-view is conducted across ‘institutional learning space development’ (ILSD) and the ‘learning city / region’ discourse (LCR), in order to discuss stakeholder involvement in planning. Six key themes are summarized and tested against a case study of ‘Hume Global Learning Village’ (HGLV), Australia, using a document analysis and expert online interviews.
The review finds the following themes: First, the concepts of ILSD and ECUD can be very abstract to comprehend, and stakeholders’ varied understandings of ‘learning’ demands an open, continuous dialogue. Next, individual leadership needs to initiate a vision, and multiply buy-in and followers. Securing sustainable funding sources is a precondition to foster participation and commitment. Long-standing organizational ‘silo-thinking’ has to be opened up towards cultures of sharing, collaboration, and innovation. Facilitation capacities are crucial to provide an inclusive planning process where con-sent and commitment is fostered. Lastly, change and positive learning effects may take a long time to show – this expectation has to be internalized by all stakeholders.
Despite few optimal interview sources, the case study confirms the themes, and illustrates that excess leadership can ensure the other conditions. This suggests that the six themes can serve as a framework for practitioners to conduct successful stake-holder involvement in planning. However, they are not unique among good-case literature. Moreover, the review shows a literature gap in how a suitable degree of stakeholder involvement can be selected. It is recommended to consolidate the various, alterna-tive planning processes and models, and further triangulate local experiences, in order to close this gap and derive more comprehensive and universal tools for practitioners.
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 bachelor thesis wants to describe a prototypical implementation of a 3D user interface for intuitive real-time set editing in virtual production. Furthermore this approach is evaluated qualitatively through a user group, testing the device and fill in a questionnaire. The dimension of virtual elements created with computer graphics technology in all areas of entertainment industry is steadily growing since the past years. Nevertheless can the editing process of virtual elements still require a costly process in terms of time and money. With the appearance of new input devices and improved tracking technologies it is interesting to evaluate if a real-time editing process could improve this situation. Being currently bound to experts on special workstations, this could lead to a more intuitive and real-time workflow, enabling everybody on a film set to influence the digital editing process and work collaboratively on the scene consisting of virtual and real elements.
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.
Privacy in Social Networks
(2016)
Online Social Networks (OSNs) are heavily used today and despite of all privacy concerns found a way into our daily life. After showing how heavy data collection is a violation of the user's privacy, this thesis establishes mandatory and optional requirements for a Privacy orientated Online Social Network (POSN). It evaluates twelve existing POSNs in general and in regard to those requirements. The paper will find that none of these POSNs are able to fulfill the requirements and therefore proposes features and patterns as a reference architecture.
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.
Head Mounted Displays (HMD) are increasingly used in various industries. But apart from the industry environment, the potentials of HMDs in a private environment like at home has been rel- atively unexplored so far. What daily tasks can these help with, in the home kitchen for example?
The aim of this thesis is to obtain knowledge about the usefulness of such an HMD, the HoloLens, in combination with an application, while following a new recipe. Therefore a prototype applica- tion for the HoloLens got developed which guides a user through the cooking of a sushi burger by using multimedia content.
With a mixed method design, consisting of quantitative and qualitative methods, the HoloLens in combination with an application was evaluated by 14 participants.
Not only the weight of the device was a problem for users. The test also revealed that the display is darkening the view and participants tend to look below the glasses. An advantage is indeed to reach the next cooking step without the need of using hands and always having in sight what needs to be done next. Positive feedback was given as well for the application. Through voice control the user communicates to a character which will guide through the recipe by videos and text.
If in future the technical characteristics of HMD devices will improve, an application in this con- text will be of advantage in order to simplify learning a new recipe. This device, in combination with an application, could help early-middle stage cognitive impaired people and blind people to cook.
Password-based authentication is widely used online, despite its numerous shortcomings, enabling attackers to take over users’ accounts. Phishing-resistant Fast IDentity Online (FIDO) credentials have therefore been proposed to improve account security and authentication user experience. With the recent introduction of FIDO-based passkeys, industry-leading corporations aim to drive widespread adoption of passwordless authentication to eliminate some of the most common account takeover attacks their users are exposed to. This thesis presents the first iteration of a distributed web crawler measuring the adoption of FIDO-based authentication methods on the web to observe ongoing developments and assess the viability of the promised passwordless future. The feasibility of automatically detecting authentication methods is investigated by analyzing crawled web content. Because today’s web is increasingly client-side rendered, capturing relevant data with traditional scraping methods is challenging. Thus, the traditional approach is compared to the browser-based crawling of dynamic content to optimize the detection rate. The results show that authentication method detection is possible, although there are some limitations regarding accuracy and coverage. Moreover, browser-based crawling is found to significantly increase detection rate.
Today’s digital cameras use a mosaic of red, green, and blue color filters to capture images in three color channels on a single sensor plane. This thesis investigates the use of convolutional neural networks (CNNs) for demosaicing – the process of reconstructing full-color images from raw mosaic sensor data. While there are existing CNNs for demosaicing raw images from the well-established regular Bayer color filter array (CFA), this thesis focuses on how they perform on alternative non-regular sampling patterns that produce less aliasing artifacts, namely the stochastic Gaussian- and the RandomQuarter sampling pattern (Backes and Fröhlich, 2020).
A basic UNet (Ronneberger et al., 2015) and the spatially adaptive SANet (T. Zhang et al., 2022) are implemented in a supervised training pipeline based on the PixelShift200 image dataset (Qian et al., 2021) to investigate their suitability for the irregular demosaicing task. The experiments indicate that the basic UNet encounters difficulties in restoring the missing color values, whereas the spatially adaptive convolutional layers help in processing the irregularly sampled raw images.
In addition, this thesis enhances SANet effectiveness by employing an alternative residual branch based on a CFA-normalized Gaussian filter, as well as a tileable modification to the Gaussian CFA pattern. The modified SANet is shown to outperform the conventional dFSR algorithm (Backes & Fröhlich, 2020) in terms of peak signal to noise ratio (PSNR) and structural similarity index measure (SSIM).
The idea is quite obvious. Anyone studying “Media
Creation & Management” as part of an international
minor program should not just learn about international
management topics and international media
markets in theory, but also engage in their own media
project as part of an international team of students
– in this particular case, writing and editing as well as
layout and production of a magazine on the topic of
international media management.
This is exactly what 50 students of the International
Media Management class did during the summer term
2022. And the result is the magazine you are now
holding in your hands. The students looked at topics
related to international media management from
various perspectives, analyzed markets and dealt with
international digital and media companies – sometimes
using management tools, sometimes in a more
scientifi c and sometimes in an entertaining way. The
result is a magazine that is directed at students as well
as lecturers and those responsible for international
exchange programs at universities.
Did the students catch your interest? You can fi nd
more information about the minor program “Media
Creation & Management” at Stuttgart Media University
(Hochschule der Medien) and the idea of studying in
Stuttgart in this magazine or oline with the top QRCode
on the left.
Kind regards and see you in Stuttgart.
Yours
Uwe Eisenbeis
The idea is quite obvious. Anyone studying “Media Creation
& Management” as part of an international minor
program should not just learn about international management
topics and international media markets in theory,
but also engage in their own media project as part
of an international team of students – in this particular
case, writing and editing as well as layout and production
of a magazine on the topic of international media
management.
This is exactly what 50 students of the International
Media Management class did during the winter term
2022/2023. And the result is the magazine you are now
holding in your hands. The students looked at topics related
to international media management from various
perspectives, analyzed markets and dealt with international
digital and media companies – sometimes using
management tools, sometimes in a more scientific and
sometimes in an entertaining way. The result is a magazine
that is directed at students as well as lecturers and
those responsible for international exchange programs
at universities.
Did the students catch your interest? You can find more
information about the minor program “Media Creation &
Management” at Stuttgart Media University (Hochschule
der Medien) and the idea of studying in Stuttgart in this
magazine or oline with the top QR-Code on the left.
Kind regards and see you in Stuttgart.
Yours
Uwe Eisenbeis
Prof. Dr. Uwe Eisenbeis
Dean of Studies, Program Media Management
The idea ist quite obvious. Anyone studying „Media Creation & Management“ as part of an international minor program should not just learn about international management topics and international media markets in theory, but also engage in their own media project as part of an international team of students – in this particular case, writing and editing as well as layout and production of a magazine on the topic of international media management.
This is exactly what 39 students of the International Media Management class did during the summer term 2023. And the result is the magazine you are now holding in your hands. The students looked at topics related to international media management from various perspectives, analyzed markets and dealt with international digital and media companies – sometimes using management tools, sometimes in a more scientific and sometimes in an entertaining way. The result is a magazine that is directed at students as well as lectures and those responsible for international exchange programs at universities.
Did the students catch your interest? You can find more information about the minor program “Media Creation & Management” at Stuttgart Media University (Hochschule der Medien) and the idea of studying in Stuttgart in this magazine.
The number of people with cognitive impairments increases together with the aging population. Thus, social robots are being researched to aid relieve the nursing
sector as well as to combat cognitive impairments. However, it raises concerns regarding how a social robot should relate to members of this group and what might
be appropriate. In this thesis, research about the current state of social robots has been conducted and focus groups with people from the nursing and medical field were held. To verify the credibility of the results and the scenario developed, final
user tests were conducted with representatives of the target group. When using a
social robot in an interaction with persons who have cognitive disabilities, the robot
should speak and behave more human-like and make use of its facial expressions,
stressing empathy and responding to the person accordingly. Though the situation
of interacting with a social robot may be more significant in future generations.
Deep learning methods have proven highly effective for object recognition tasks, especially
in the form of artificial neural networks. In this bachelor’s thesis, a way is shown to imple-
ment a ready-to-use object recognition implementation on the NAO robotic platform using
Convolutional Neural Networks based on pretrained models. Recognition of multiple objects
at once is realized with the help of the Multibox algorithm. The implementation’s object
recognition rates are evaluated and analyzed in several tests.
Furthermore, the implementation offers a graphical user interface with several options to
adjust the recognition process and for controlling movements of the robot’s head in order
to easier acquire objects in the field of view. Additionally, a dialogue system for querying
further results is presented.