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    <title>https://opus4.kobv.de/opus4-uni-koblenz</title>
    <description>OPUS documents</description>
    <link>https://opus4.kobv.de/opus4-uni-koblenz/index/index/</link>
    <pubDate>Tue, 05 May 2026 09:58:20 +0200</pubDate>
    <lastBuildDate>Tue, 05 May 2026 09:58:20 +0200</lastBuildDate>
    <item>
      <title>Evaluating Hallucination and Trust in LLM-Enhanced Information Retrieval Systems</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2643</link>
      <description>The integration of Large Language Models (LLMs) into information retrieval sys tems has transformed the user experience by providing direct, conversational responses instead of traditional ranked lists of search results. This modification raises substantial concerns about user trust, behaviour, and the risk of misinformation, even as it improves accessibility and convenience. This thesis investigates the impact of generative information retrieval on the reliability of synthesized answers, particularly focusing on how hallucination rates and semantic drift influence trust dynamics and information-seeking behavior. By evaluating the performance of different LLMs on fact-checking benchmarks, the study seeks to quantify the advantages of model scaling against the inherent risks of factual inaccuracy. &#13;
&#13;
The study evaluates hallucination and user trust in LLM-augmented information retrieval systems using three fact-checking datasets. Three well-known semantic similarity metrics are employed to assess the alignment between LLM responses and ground-truth references. Furthermore, the hallucination rate and factual consistency are assessed by aligning model-generated responses with verified annotations in fact-checking datasets. We utilise bias detection measures to evaluate implicit stereotype reinforcement in LLM outputs. This study applies a comprehensive framework for evaluating and auditing hallucinations by combining quantitative performance metrics with user-level reliability insights. The work aims to establish a baseline for the transparency and reliability of LLMs in search and retrieval contexts.</description>
      <author>Aswin Panthithara Suresh</author>
      <category>masterthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2643</guid>
      <pubDate>Tue, 05 May 2026 09:58:20 +0200</pubDate>
    </item>
    <item>
      <title>Object Detection in Point Clouds for Mobile Robots</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2641</link>
      <description>Affordable RGB-D cameras have gained broad research attention in computer vision. This imaging modality provides registered 3-D and RGB data of the perceived environment in the point cloud data format. RGB-D cameras and point clouds allow for a seamless integration of object recognition in mobile robotics applications. Not only do point clouds pose a potential for novel algorithms, the provided geometric information also facilitates estimating adequate positions for mobile manipulation – an action that often follows the recognition process in mobile robotics. Research on vision algorithms based on 3-D data is far less advanced than on 2-D images. Further, RGB-D cameras also pose some technical challenges. Due to their inner workings, they provide erroneous measurements, have a limited range and a much lower resolution than RGB cameras.&#13;
In this thesis, I will focus on the object classification and detection parts of vision pipelines for mobile robotics. The main research question is whether point clouds from low-cost RGB-D cameras can be used to reliably solve these tasks. I decided to use a traditional algorithm for my investigations. Traditional algorithms usually demand less computational resources for training and require less data to build a model for inference. For these and other reasons some application scenarios might restrict or prohibit using methods based on deep neural networks (DNN).&#13;
The presented point cloud processing pipeline is a non-parametric approach to object classification and detection. It is inspired by the local Naive-Bayes Nearest Neighbor (NBNN) and the Implicit Shape Model (ISM) algorithms originally introduced for 2-D images. Local feature descriptors are used to construct a spatial code-book during the training stage. In the test stage this codebook is used in a Hough voting scheme to generate object hypotheses. I will carefully adapt ideas from the above methods and extend several pipeline steps by novel contributions. At all times, I will target fast processing with limited computational resources in mind.&#13;
In a first step, I will focus on isolated objects for classification to gain insights into using point clouds for vision. Subsequently, the presented pipeline will be extended to handle noisy data for object detection in cluttered environments. The contributions of this thesis include an efficient sampling method to find suitable locations for local descriptors and the creation of a descriptive codebook with ranked feature descriptors. The hypothesis generation is followed by an elaborate hypothesis verification step and an additional verification with global feature descriptors in an ensemble classifier. Further, I introduce modifications to two popular local descriptors and also extend them to the global scale.&#13;
The developed approaches are evaluated on publicly available datasets with simulated and real sensor data. Further, the mobile service robot Lisa was used for evaluation during several competitions and achieved excellent results. The results of this work enable fast and reliable shape classification of isolated objects, as well as object detection in cluttered environments. The complete pipeline is open-source and is published online in a software repository under a permissive license.</description>
      <author>Viktor Seib</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2641</guid>
      <pubDate>Mon, 20 Apr 2026 08:45:11 +0200</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Wintersemester 2024/25 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2640</link>
      <description>Veranstaltungsverzeichnis Wintersemester 2024/25 - Koblenz</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2640</guid>
      <pubDate>Thu, 09 Apr 2026 15:59:14 +0200</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Sommersemester 2024 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2639</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Sommersemester 2024</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2639</guid>
      <pubDate>Thu, 09 Apr 2026 11:51:07 +0200</pubDate>
    </item>
    <item>
      <title>Exploring Intersectional Fairness and Bias Mitigation Techniques in Job Recommendation</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2638</link>
      <description>Along with the increased use of automation processes in every other task, job recommendations as well as hiring have also become partially automated. In the process of applying only to those jobs that are recommended by a system or choosing only from those candidates that are selected by an automated system, it becomes highly important to find out if the automated systems are trustworthy enough to provide fair decisions. There has been research on fairness in this sector, where the main focus has been on a single protected attribute, in most cases ’gender.’ That is why the aim of this research is to delve deeper into a deep learning transformer-based algorithm used for job matching with a text-based resume dataset containing several demographic attributes to investigate the fairness of the algorithm not only for gender but also for other demographic groups such as race, age group, and experience level. The fairness evaluation has been carried out using multiple fairness metrics, including demographic parity, conditional demographic parity, and equal opportunity. The transformer models that are pretrained language models are chosen for this study due to their ability to understand the meaning and context of words in resumes and job descriptions. The thesis further investigates bias using an alternative approach by working on a dataset containing varying protected attributes and then conducting a comparable analysis of several bias mitigation methods, including multiple layers of data resampling, along with sensitivity testing through data modification in the preprocessing step of the recommendation process. The research reveals that a system performing fairly when considering a single protected attribute can even hide intersectional unfairness and that the bias mitigation methods do not ensure a balanced improvement across each subgroup when considering multiple combinational demographic groups.</description>
      <author>Resmin Hossain</author>
      <category>masterthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2638</guid>
      <pubDate>Wed, 08 Apr 2026 12:54:02 +0200</pubDate>
    </item>
    <item>
      <title>Alterität in Stefan Andres‘ Romanen "Die unsichtbare Mauer" und "Die Reise nach Portiuncula" unter besonderer Berücksichtigung der postkolonialen Theorien von Homi K. Bhabha</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2635</link>
      <description>Die vorliegende Dissertation unternimmt eine grundlegende Neubewertung des Werkes von Stefan Andres (1906–1970), der nach seiner Zeit als Bestsellerautor der Nachkriegsjahre weitgehend aus dem literarischen Kanon verschwunden ist. Entgegen der herkömmlichen Rezeption, die Andres oft auf seinen als nicht mehr zeitgemäß erachteten christlichen Humanismus oder auf seinen Ruf als Heimatdichter reduziert, weist die Arbeit nach, dass sein Œuvre eine hohe Modernität besitzt und komplexe Identitätsdiskurse sowie Alteritätserfahrungen verhandelt, die für die globalisierte Gesellschaft des 21. Jahrhunderts von hoher Relevanz sind.&#13;
&#13;
Methodisches Rückgrat der Untersuchung ist die kontrapunktische Lektüre im Sinne Edward Saids, die durch das poststrukturalistisch geprägte Instrumentarium Homi K. Bhabhas erweitert wird. Im Zentrum stehen dabei Bhabhas Konzepte der Hybridität, des Dritten Raumes, der Mimikry und der Ambivalenz. Diese Theorien, die ursprünglich im Kontext kolonialer Machtverhältnisse entstanden sind, werden in dieser Arbeit erfolgreich auf die literarische Darstellung innereuropäischer und geschlechtsspezifischer Machtasymmetrien transferiert.&#13;
&#13;
Anhand der Romane „Die unsichtbare Mauer“ (1934) und „Die Reise nach Portiuncula“ (1954) wird aufgezeigt, wie Andres binäre Oppositionen – etwa zwischen urbanem Zentrum und ruraler Peripherie – sowohl inszeniert als auch subversiv unterlaufen werden.  In der Analyse des Romans „Die unsichtbaren Mauer“ wird der Bau der Dhrontalsperre als eine koloniale Situation gedeutet, in der technokratisches Wissen zur epistemischen Gewalt gegenüber einer marginalisierten Landbevölkerung wird. Beim Roman „Die Reise nach Portiuncula“ &#13;
wird die metaphorische Afrikanisierung des italienischen Schauplatzes demaskiert, die dazu dient, die Protagonistin Assunta als exotisierte „Andere“ zu konstruieren und patriarchale Herrschaftsansprüche zu legitimieren. Die Arbeit belegt, dass die weiblichen Figuren bei Andres sich starren Stereotypen entziehen und sich durch Formen der „schlauen Höflichkeit“ oder gewaltsamen Widerstand zu handlungsstarken Subjekten entwickeln. &#13;
&#13;
Abschließend zeigt die Dissertation, dass das Re-Reading von Stefan Andres durch die Brille der Postcolonial Studies nicht nur dessen Werk neu erschließt, sondern auch die Leistungsfähigkeit kulturtheoretischer Analysewerkzeuge für die Germanistik unter Beweis stellt. Damit leistet die Arbeit einen wesentlichen Beitrag zur aktuellen Debatte um die Erweiterung des literarischen Kanons und die Dekonstruktion eurozentrischer Wahrnehmungsmuster.</description>
      <author>Christiane Gandner</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2635</guid>
      <pubDate>Wed, 08 Apr 2026 12:15:07 +0200</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Wintersemester 2023/24 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2634</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Wintersemester 2023/24</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2634</guid>
      <pubDate>Wed, 08 Apr 2026 11:58:31 +0200</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Sommersemester 2023 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2632</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Sommersemester 2023</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2632</guid>
      <pubDate>Wed, 08 Apr 2026 11:58:13 +0200</pubDate>
    </item>
    <item>
      <title>Development of new methods for non-target &#13;
analysis to prioritize specific organic &#13;
micropollutants and their sources in the &#13;
aquatic environment</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2636</link>
      <description>In order to support both the provision of clean drinking water and the preservation of biodiversity in aquatic ecosystems, a comprehensive scientific understanding of the identity, concentration, and behavior of anthropogenic pollutants in the aquatic environment is essential. Organic micropollutants constitute a large group of anthropogenic pollutants and originate from all areas of daily human life: pharmaceuticals are part of the daily routine for many people, pesticides are crucial for food production, and organic chemicals are used in the industrial production of paper, plastics, paints, and many other products. These micropollutants enter the water cycle, either in their parent form or as transformation products, where they can lead to potentially harmful effects. In addition to target methods, non-target approaches have been established as powerful tools for comprehensively investigating these compounds in the water cycle. Beyond the analytical challenges of instrumentally detecting these compounds, the prioritization and evaluation of the large datasets generated by non-target pose both chemical and data science challenges, forming the overarching theme of this work.&#13;
The work comprises three studies demonstrating the development and application of non-target screening (NTS) methodologies. In an NTS using high-performance liquid chromatography (HPLC) coupled with high-resolution mass spectrometry (QTOF-MS/MS), 112 samples from the river Nidda and seven of its tributaries were analyzed. On average, approximately 2700 signals, or features, were detected per sample. To filter these extensive data and prioritize unknown compounds, a method was first developed to reliably assign adducts, isotopologues, source fragments and other ionization products to a common component based on retention time and peak shape. In the next step, the prioritization of unknown compounds was achieved by highlighting features that were detected specifically at individual sites under investigation, but which were not typically considered to originate from municipal wastewater. This was accomplished by comparing the data from the Nidda river system with NTS data from municipal wastewater treatment plant effluents. Only the highlighted, Nidda-specific features were considered further. As a result, an average data prioritization of 7% across all samples was achieved, leading to the identification of nine compounds. Among these were the industrial compound Nylostab S-EED™, which had not been previously observed in the environment and three algal toxins, whose occurrence resulted from the algal bloom of a nearby water body.&#13;
In the second study, investigations focused on permanently cationic compounds in suspended particulate matter samples from the rivers Rhine and Saar. The data prioritization was based on the specific physicochemical properties of this substance group. Following extraction, a two-step procedure was applied, relying on interactions with strong ion exchangers and chromatography using deuterated solvents. This resulted in 5% of the detected NTS signals being labeled as potentially cationic compounds. Based on this, 22 compounds were identified, four of which were previously unknown. Trend analyses covering the period from 2005/2006 to 2018, along with an assessment of the ecotoxicological risks based on semi-quantitatively determined concentrations, suggest that identified compounds such as Basic Yellow 28 and Fluorescent Brightener 363 may have a high ecotoxicological relevance.&#13;
The third study focused on the analysis of samples from disconnected, inter-regional river systems. In collaboration with the local environmental authorities, a three-year study was conducted, analyzing 524 samples from 79 sites along rivers across Saxony. For this purpose, a method was developed that allowed for the characterization of sites based on five categories, considering both known and unknown compounds to assess their chemical contamination. The results were classified by calculating the modified z-scores within each category. The method was validated based on the results of target analysis in the same samples. As a result of the study, 13 sites were classified as anomalous due to high z-scores, as elevated levels of pharmaceuticals, industrial chemicals but also unclassified unknown compounds were detected. At two potentially industrially contaminated sites, the Münzbach and Dorfbach Oberschindmaas, nine compounds were identified and their concentrations were estimated using a 1-point calibration. For the compound hexa(methoxymethyl)melamine, a concentration in the range of 300 µg/L was determined, suggesting a considerable risk for the environment (risk quotient: 5.6).</description>
      <author>Toni Köppe</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2636</guid>
      <pubDate>Fri, 27 Mar 2026 12:09:15 +0100</pubDate>
    </item>
    <item>
      <title>Monitoring Microplastics in the River Rhine: From method development &#13;
and −application towards Microplastic load calculation</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2629</link>
      <description>Microplastics (MP) (1 μm to 5 mm) enter riverine environments in various ways. Point sources (e. g. industrial plants) can be differentiated from diffuse sources (e. g. erosion). Once MP has entered river systems, it underlies hydrodynamic processes and is finally transported towards the oceans. Due to fragmentation, MP particles decrease in size during transport. MP particles are highly heterogeneous considering density and shape, which makes spatially and temporally high resolved sampling difficult and thus hampers the quantification of annual loads in rivers. Within this thesis, we conducted a spatially and temporally high resolved monitoring in the River Rhine with the aim to quantify an annual MP load at our study site, Koblenz.&#13;
With a literature review we exposed that most studies present their results by means of particle number instead of particle mass. Also, many studies did not consider spatial nor temporal aspects within their sampling design. For the first time, we presented a compilation of global annual load values within river systems, partly using innovative methodological approaches to convert MP items to MP mass. Hereby, a correlation between catchment area and annual MP load could be detected. Global loads showed a large range (&lt; 1 kg/y – 1533 t/y).&#13;
To estimate the annual MP load of the River Rhine at the study site Koblenz, we performed a temporally high resolved sampling using sedimentation boxes (SB, time-integrated samples over months) and a continuous flow centrifuge (CFC, discrete sampling). Via thermal degradation procedures, polymer concentration in mg/g was estimated for PP, PE, PS and PVC. Hereby, annual loads of 400 t (SB) and 60 t (CFC) were calculated. Deviation of both methods was more pronounced for polymers with lower density (PP and PE), whereas PVC loads were comparable. This led to further laboratory experiments, which showed that particle retention efficiency of the SB was varying with the particle’s properties. Thus, the SB sample might not be representative for the river’s conditions. Furthermore, the CFC had difficulties in retaining polymers with lower density (losses up to &gt; 50 % were noticed). Nevertheless, the calculated MP loads do fit well into our compilation of global MP load values. An extensive quantification of retention efficiencies for several polymer types and particle sizes (SB) or an additional sampling step for the clearwater of the CFC for low-dense MP particles could lead to more robust MP concentration values in the future.&#13;
Depth-distributed sampling campaigns with a filter cascade and filter nets revealed strong density-dependant vertical gradients within the water column. These gradients were even apparent within the smallest particle size classes and thus were larger than a theoretical determination based on the Rouse number would have suggested. Both, filter cascade and filter net showed a positive correlation between river discharge and MP concentration. This correlation allows for a first speculation on MP sources within the River Rhine: The main source of MP seems, in congruence with suspended sediments, to be a diffuse entry which rises with rising water level. In contrast, a constant entry from a point source would lead to lower concentrations during flood events due to dilution.&#13;
Within this work we could point out that extensive research is needed considering the understanding of different sampling devices and their sampling efficiencies. First approaches for an improvement of these limitations have been shown. Still, a combination of sampling techniques is necessary to cover the portfolio of potential issues regarding MP research. For a more precise quantification of annual MP loads, standardisation of procedures on all working steps is urgently needed.</description>
      <author>David Range</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2629</guid>
      <pubDate>Fri, 27 Mar 2026 06:54:09 +0100</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Wintersemester 2022/23 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2631</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Wintersemester 2022/23</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2631</guid>
      <pubDate>Tue, 24 Mar 2026 08:07:28 +0100</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Wintersemester 2021/22 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2630</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Wintersemester 2021/22</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2630</guid>
      <pubDate>Tue, 24 Mar 2026 08:07:10 +0100</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Sommersemester 2021 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2626</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Sommersemester 2021</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2626</guid>
      <pubDate>Thu, 19 Mar 2026 18:00:28 +0100</pubDate>
    </item>
    <item>
      <title>Veranstaltungsverzeichnis Sommersemester 2022 - Koblenz</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2623</link>
      <description>Veranstaltungsverzeichnis - Koblenz - Sommersemester 2022</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2623</guid>
      <pubDate>Thu, 05 Mar 2026 09:17:56 +0100</pubDate>
    </item>
    <item>
      <title>Mitteilungsblatt der Universität Koblenz, Nr. 6/2025</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2621</link>
      <description>Promotionsordnung des Fachbereichs 2:&#13;
Philologie / Kulturwissenschaften der Universität Koblenz&#13;
Promotionsordnung des Fachbereichs 3:&#13;
Mathematik / Naturwissenschaften der Universität Koblenz&#13;
Promotionsordnung des Fachbereichs 4:&#13;
Informatik der Universität Koblenz&#13;
Ordnung für die Eignungsprüfung Musik der Universität Koblenz&#13;
Promotionsordnung des Fachbereichs 1:&#13;
Bildungswissenschaften der Universität Koblenz</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2621</guid>
      <pubDate>Tue, 20 Jan 2026 17:54:35 +0100</pubDate>
    </item>
    <item>
      <title>Mathematisches Argumentieren im Blick?&#13;
Kompetenzerwerb angehender&#13;
Mathematiklehrkräfte in Schulpraxisphasen</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2618</link>
      <description>Die vorliegende Studie untersuchte den Kompetenzerwerb angehender Mathematiklehrkräfte in Rheinland-Pfalz in deren letzter Praktikumsphase, dem Vertiefenden Praktikum, vor Eintritt in den Vorbereitungsdienst.&#13;
Um den Lernfortschritt der Studierenden zu erfassen, wurde ein Pre-/Posttest-Vorgehen gewählt, bei dem die Teilnehmer 5 kurze Unterrichtssequenzen in einem Online-Fragebogen analysierten und anschließend Fragen zum mathematischen Argumentieren beantworteten. Damit bildete die Testung einen zentralen Praktikumsinhalt ab, das Beobachten und Reflektieren von Fachunterricht. Alle Videosequenzen waren auf Aspekte mathematischen Argumentierens im Unterricht hin ausgerichtet. Mathematisches Argumentieren beschreibt nicht nur eine der in den Bildungsstandards und in den Lehrplänen für das Fach Mathematik festgeschriebenen allgemeinen Kompetenzen, sondern geht in seiner fundamentalen Bedeutung für die Mathematik und den Mathematikunterricht noch über die der anderen allgemeinen Kompetenzen hinaus.&#13;
In der Testgruppe wurden in den Jahren 2022 und 2023 in 4 Praktikumszeiträumen insgesamt 54 Praktikantinnen und Praktikanten jeweils zu Beginn und am Ende ihres Vertiefenden Praktikums befragt. Die Kontrollgruppe bildeten 28 Studierende der Mathematik, die in einem Abstand von 3 Wochen ebenfalls zweimal befragt wurden, ohne dass zwischenzeitlich ein Schulpraktikum durchlaufen wurde. Die erhobenen Datensätze, die im Kern aus Freitextantworten bestehen, wurden nach dem Verfahren einer qualitativen Inhaltsanalyse ausgewertet. Zusätzlich wurde die hierbei auftretende interpretatorische Unsicherheit durch eine Rückwärtstestung minimiert. So konnten für jeden Befragten die Quantität und die Qualität der Videoanalyse sowie das Wissen und Verständnis zum mathematischen Argumentieren bei beiden Testungen ermittelt und miteinander verglichen werden.&#13;
Im Ergebnis bestätigt die Studie vorhergehende Erkenntnisse hinsichtlich der Wahrnehmung von Unterricht durch Experten und Novizen und auch zum grundsätzlichen Wissenszuwachs durch Praxisphasen. Zusätzlich zeigt sich in der Studie ein sowohl quantitativ als auch qualitativ verbessertes Antwortverhalten nach dem Praktikum und die Testteilnehmer konnten insbesondere fundierter Aspekte des Argumentierens in den Unterrichtsausschnitten identifizieren und deren Bedeutung für guten Mathematikunterricht begründen. Bei Unterrichtssituationen ohne große Dynamik gelang dies allerdings besser als bei Unterrichtssituationen mit großer Dynamik, die beispielsweise durch Gesprächssituationen&#13;
entstehen. Ergänzend konnte ein vertieftes Verständnis der Kompetenz `Mathematisch argumentieren´ nach dem Praktikum nachgewiesen werden und es zeigte sich, dass dieses fachdidaktische Wissen beim Posttest stärker mit der Fähigkeit zur Videoanalyse korreliert als vor dem Praktikum.&#13;
Die Effekte zeigten sich ausschließlich bei der Testgruppe, nicht aber bei der Kontrollgruppe ohne Praktikum.</description>
      <author>Dirk Kehrig</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2618</guid>
      <pubDate>Tue, 20 Jan 2026 17:41:41 +0100</pubDate>
    </item>
    <item>
      <title>Bewegungskorrektur basierend auf 3D-Dekonvolution und&#13;
Segmentierung basierend auf Texturalen Eigenschaften zur&#13;
Optimierung der Tumorsegmentierung in der Positronen&#13;
Emissions Tomographie</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2620</link>
      <description>Bewegung und daraus resultierende Bewegungsartefakte während einer PET-Aufnahme&#13;
beeinträchtigen die quantitative (kleine Läsionen könnten übersehen werden) und qualitative (das&#13;
Volumen der Läsion überschätzt, im Gegensatz dazu die Intensität bzw. der Uptake unterschätzt)&#13;
Beurteilbarkeit. Unser entwickelter Bewegungskorrekturalgorithmus greift auf routinemässig&#13;
aufgenommene Bilder zurück und liefert deutlich verbesserte und genauere Darstellungen der&#13;
Traceranreicherung. Bei 3D Modellierung und Dekonvolution in 3D konnten Veränderungen im&#13;
Tumorvolumen bis zu 33,3% erzielt werden und in den Phantomstudien sogar bis zu 49% Volumen-&#13;
Verbesserung.&#13;
Ein weiterer Entwicklungsschritt in den letzten Jahren war die Etablierung textural basierter Analysen&#13;
von PET-Bildern. Wir nutzen diese Heterogenität innerhalb des Tumors in der PET-Bildgebung für die&#13;
Entwicklung von Algorithmen zur Tumorsegmentierung. Unsere entwickelten&#13;
Segmentierungsalgorithmen lieferten gute Ergebnisse. Die Segmentierung basierend auf der Entropie&#13;
lieferten in der Phantomstudie die besten Resultate, der KU-basiert und LE-basiert sowie der&#13;
Grenzwertbasierte Algorithmus konnten alle (bis auf 1 Ausnahme) Patienten-Läsionen gut&#13;
segmentieren. Alle segmentierten Volumina korrelierten sehr gut mit den pathologischen Volumina.&#13;
Zusammenfassend wurden in dieser Arbeit somit zwei wichtige Limitierungen für die PET-Bildgebung,&#13;
die Bewegungsunschärfe und die Segmentierung von Läsionen für die FDG-PET/CT bei Patienten mit&#13;
Lungenkarzinomen bearbeitet und entsprechende Korrekturalgorithmen entwickelt, die erfolgreich&#13;
anhand von Phantom- und Patientendatensätzen validiert werden konnten. Im nächsten Schritt&#13;
müssen diese Algorithmen Einzug in grössere, ggf. prospektive klinische Studien finden.</description>
      <author>Lena Bundschuh</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2620</guid>
      <pubDate>Tue, 13 Jan 2026 18:03:44 +0100</pubDate>
    </item>
    <item>
      <title>Collaborative Actions on Documents Ontology (ColActDOnt)</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2616</link>
      <description>Seit mehr als 10 Jahren forscht und lehrt das Team des Centers for Enterprise Research (CEIR) an der Universität Koblenz im Bereich der digitalen Unterstützung kollaborativer Arbeit in Unternehmen (Enterprise Collaboration) und untersucht den Aufbau und die Nutzung von Kollaborationstechnologie für den Digitalen Arbeitsplatz.&#13;
Der vorliegende CEIR Report mit dem Titel „Collaborative Actions on Documents Ontology (ColActDOnt)“ beschreibt die Entwicklung einer Ontologie für Benutzeraktionen an Content in Kollaborationssystemen (englisch: Enterprise Collaboration Systems). Die Arbeit an der Ontologie erfolgte im Rahmen eines DFG-Projekts mit dem Titel „Social Process Mining“. In diesem Projekt wurde eine Methode für das sogenannte „Cross-System Process Mining“ entwickelt. Cross-System Process Mining erlaubt die Analyse von Arbeitsprozessen, deren Ablauf von mehreren, heterogenen Kollaborationslösungen (z.B. HCL Connections, Alfresco, Skype) unterstützt werden. Aufgrund der Heterogenität der involvierten Systeme müssen die Logfiles der unterschiedlichen Softwaresysteme zunächst in einen gemeinsamen, harmonisierten Event-Log überführt werden. Die ColActDOnt stellt die notwendige Systematik für diese Harmonisierung zur Verfügung.&#13;
Die Ontologie wurde entwickelt in einer Reihe von interaktiven Workshops mit den Projektbeteiligten (Prof. Dr. Petra Schubert, Dr. Florian Schwade, Julian Mosen) unter der Leitung von Martin Just, der die Ergebnisse anschließend im Rahmen seiner Masterarbeit dokumentierte. Anschließend wurden die wichtigsten Teile in gekürzter Form in dem vorliegenden CEIR-Report veröffentlicht.&#13;
Mit den CEIR-Reports möchten wir ausgewählte wissenschaftliche Ergebnisse einem breiteren Publikum zur Verfügung stellen. Die in dieser Arbeit dargestellten Informationen sind für Unternehmen interessant, die an einer gezielten (Weiter-)Entwicklung ihrer Enterprise Collaboration Platform interessiert sind.</description>
      <author>Martin Just</author>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2616</guid>
      <pubDate>Thu, 11 Dec 2025 09:20:28 +0100</pubDate>
    </item>
    <item>
      <title>Development and Characterization of&#13;
3D Printable Diffusion Controlled&#13;
Drug Formulations With UV-Curable&#13;
Photopolymer Resins</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2613</link>
      <description>In recent decades, there has been a growing awareness in our society of the impor-&#13;
tance of medicines that are personalized to the needs of patients. This dissertation&#13;
contributes to the research on personalized dosage forms with controlled drug release.&#13;
The basis of our investigations is the simulation of the expected diffusion properties&#13;
of these personalized dosage forms using computer-aided statistical methods and the&#13;
subsequent adaptation of suitable models to experimentally obtained data. This&#13;
novel approach makes it possible to verify the parameters determined from exper-&#13;
imental data, such as the diffusion coefficient. A key finding is that, for instance,&#13;
the homogeneity of the sample, the precision of the measurement data collection&#13;
and the consideration of the measurement environment have a greater influence on&#13;
the validity of the diffusion coefficient than the choice of the diffusion model. The&#13;
experimental part of this thesis comprises the development and characterization of&#13;
drug-loaded polymer resins, the implant fabrication, and the pharmaceutical and&#13;
physical investigation of the polymer-drug implants. The formulation of polymer&#13;
resins and their suitability for 3D printing (3DP), as well as their use in pharmaceu-&#13;
tical applications, are extensively addressed. The release properties and, in partic-&#13;
ular, the polymer network’s mesh size influence on the active ingredient’s diffusion&#13;
rate in aqueous solution are studied. In addition, the production of polymer sam-&#13;
ples by means of UV photopolymerization in a molding process developed for this&#13;
purpose, as well as by using stereolithographic 3DP, are examined comparatively.&#13;
The polymerization process and the polymer properties resulting from the different&#13;
production methods are presented. The major findings from these studies include&#13;
the successful development of a polymer resin formulation whose release and swelling&#13;
properties are comprehensively demonstrated using a model drug. Furthermore, the&#13;
optimization of this resin for the use of the active pharmaceutical ingredient (API)&#13;
testosterone was achieved. A comparison of the two developed resin formulations&#13;
clearly shows the limitations and the possibilities of transferability of both systems.&#13;
In addition, the results concerning the release of API from the polymer, as well as&#13;
the diffusion of the solvent into the polymer and the resulting increase in the volume,&#13;
provide insight into the changed interfacial diffusion resistance in 3D printed poly-&#13;
mers compared to molded polymers. This work thus contributes to the development&#13;
of personalized drug forms and paves the way for the production of release-controlled&#13;
polymer resin implants for future follow-up work.</description>
      <author>Mi Steinbach</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2613</guid>
      <pubDate>Fri, 05 Dec 2025 09:56:20 +0100</pubDate>
    </item>
    <item>
      <title>Mitteilungsblatt der Universität Koblenz, Nr. 5/2025</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2612</link>
      <description>Richtlinie zum Schutz vor Diskriminierung und sexualisierter&#13;
Belästigung und Gewalt der Universität Koblenz</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2612</guid>
      <pubDate>Tue, 18 Nov 2025 10:42:40 +0100</pubDate>
    </item>
    <item>
      <title>Mitteilungsblatt der Universität Koblenz, Nr. 4/2025</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2611</link>
      <description>Satzung der Studierendenschaft der Universität Koblenz zur Änderung&#13;
 von Vorschriften der Studierendenschaft der Universität Koblenz&#13;
&#13;
Fünfundzwanzigste Ordnung zur Änderung der Prüfungsordnung&#13;
für die Prüfung im Zwei-Fach-Bachelorstudiengang an der Universität Koblenz&#13;
&#13;
Erste Ordnung zur Änderung der Masterprüfungsordnung für&#13;
den weiterbildenden Fernstudiengang „Master of Business Administration“&#13;
 des Fachbereichs 4: Informatik der Universität Koblenz&#13;
&#13;
Erste Ordnung zur Änderung der Masterprüfungsordnung für&#13;
den weiterbildenden Fernstudiengang Energiemanagement&#13;
des Fachbereichs 3: Mathematik / Naturwissenschaften der&#13;
Universität Koblenz&#13;
&#13;
Prüfungsordnung für den Bachelorstudiengang „Angewandte&#13;
Naturwissenschaften“ und den Masterstudiengang „Material&#13;
Science“ an der Universität Koblenz (Studiengangs-PO Angewandte &#13;
Naturwissenschaften / Material Science)&#13;
&#13;
Prüfungsordnung für das Studienmodell uk-Master an der&#13;
Universität Koblenz (Studiengangs-PO uk-Master)&#13;
&#13;
Einschreibeordnung der Universität Koblenz</description>
      <author/>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2611</guid>
      <pubDate>Tue, 18 Nov 2025 10:15:07 +0100</pubDate>
    </item>
    <item>
      <title>EduIDEAtor: An AI-Powered Project Idea Generator for Data Science Education</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2610</link>
      <description>This thesis tackles a common bottleneck in data-science courses: students struggle&#13;
to turn a broad interest into a focused, workable project idea. This thesis set out to&#13;
design and evaluate a compact assistant—EduIDEAtor—that makes this first mile&#13;
simpler and more intentional. The tool uses a text-first interface with plain inputs,&#13;
a small set of clearly different directions, and quick, reversible edits so students can&#13;
steer ideas without losing momentum. After building and iterating the web appli-&#13;
cation, The thesis evaluated how students experienced it and how it compared with&#13;
familiar, non-AI brainstorming. The findings are consistent: navigation and input&#13;
clarity were strong; students felt more able to generate and shape ideas; overall sat-&#13;
isfaction and willingness to continue using the tool were high. Two practical refine-&#13;
ments emerged—make back navigation clearly visible and give users finer control&#13;
over how broad or specific the suggestions are both achievable without changing&#13;
the core design. The contribution is a concrete pattern for first-mile ideation and a&#13;
set of actionable guidelines for course-level adoption.</description>
      <author>Kamyab Farokhi</author>
      <category>masterthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2610</guid>
      <pubDate>Tue, 18 Nov 2025 10:00:59 +0100</pubDate>
    </item>
    <item>
      <title>Information Systems Benefits Research: Review and imperatives for research on ECS benefits</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2605</link>
      <description>Globally billions of dollars are invested on information systems and technology (IS/IT) to achieve business change. Understanding how value is generated and captured from these investments has been a key theme in information systems (IS) research for over 25 years. However, despite significant theoretical progress, organisations are still failing to achieve the full value of their investments and identifying and realising the benefits of IS/IT-enabled business change remains a challenge for both research and practice.&#13;
&#13;
Our research is concerned with the business change associated with the introduction and use of new forms of enterprise collaboration system (ECS) that incorporate social software functionality (e.g. social profiles, blogs, wikis, activity streams, collaborative tagging etc). ECS represent a significant business investment; however, there remains uncertainty around the benefits and value arising from the introduction of these new types of ECS. Existing research studies on IS/IT benefits are focused primarily on traditional enterprise systems such as ERP systems. This article summarises the existing work that directly, or indirectly addresses IS benefits, to reveal four broad themes (i) evaluations of IS/IT investments (ii) measuring IS success (iii) classifying and measuring IS benefits and (iv) benefits realisation management. &#13;
The article concludes with an overview of the research on benefits management conducted in the Center for Enterpise Information Research at the University of Koblenz and the current research project investigating the benefit of enterprise collaboration systems (BECS).</description>
      <author>Susan Patricia Williams</author>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2605</guid>
      <pubDate>Tue, 04 Nov 2025 10:12:13 +0100</pubDate>
    </item>
    <item>
      <title>DFG Project No 285717372 Final Report. A Sociotechnical Framework for ECS Benefits Realisation (BECS)</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2604</link>
      <description>The BECS project investigates the benefits arising from the adoption and use of Enterprise Collaboration Systems (ECS).&#13;
&#13;
ECS are large-scale collaboration technology infrastructures that provide the software functionality to enable workgroups to organise online team meetings, to create and share information, to coordinate workflows and to collaborate on joint projects, regardless of the location and timing of work activities. &#13;
&#13;
When ECS are introduced into organisations there are initial expectations about what can be gained from the system, e.g. improved collaboration, improved communication across silos, etc. Over time, as users gain experience using the system, ideas about what can be achieved change and the ECS become embedded into organisational work practices. However, identifying and understanding the expected benefits of ECS, how they evolve over time, and how they contribute to organisational performance is challenging due to a lack of suitable methods and tools to describe (profile), measure and monitor ECS benefits. &#13;
&#13;
The BECS project addresses this challenge; the primary focus is on identifying, measuring and monitoring the benefits that arise from ECS implementation and use over time. Through the development of in-depth longitudinal case studies of ECS adoption in leading organisations in the DACH region and empirical analyses of collaboration system use, the research: &#13;
&#13;
i) developed practical tools and methods for the measurement of ECS benefits and benefits profiling; &#13;
&#13;
ii) provides greater insights into how benefits management is experienced and constituted in practice; and &#13;
&#13;
iii) developed a novel and integrated framework that assists researchers and practitioners to coordinate their efforts in developing, implementing and evaluating ECS benefits. &#13;
&#13;
The project delivered both practical and theoretical outcomes. The methods and tools developed in the BECS project have been applied in organisations and delivered useful and useable results enabling organisations to understand and monitor the evolving benefits of their ECS. Following the COVID-19 pandemic, this work became of even greater importance as new uses of ECS emerged when organisations adopted large-scale support for hybrid and remote working initiatives. &#13;
&#13;
The research findings also provide key theoretical concepts and analytical methods, including the MoBeC framework, Social Collaboration Analytics and Benefits Scorecards. These provide the foundation for subse-quent research projects to examine transformation to digital work and the development of a new stream of research into trace analysis and collaboration analytics more broadly.</description>
      <author>Susan Williams; Petra Schubert</author>
      <category>periodicalpart</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2604</guid>
      <pubDate>Tue, 04 Nov 2025 10:05:23 +0100</pubDate>
    </item>
    <item>
      <title>Innovative Frameworks for Scalable&#13;
Connectivity, Trust, and Security in Future&#13;
Hyper-Connected Ecosystems</title>
      <link>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2608</link>
      <description>The rapid evolution of wireless communication technologies, particularly the introduction&#13;
of Fifth-Generation (5G) networks and the anticipated transition to Sixth-Generation (6G)&#13;
systems, ushers in a new era of connectivity, enabling transformative applications across&#13;
industrial automation, the Internet of Everything (IoE), and the Industrial Internet of Things&#13;
(IIoT). However, the exponential growth in the number of connected devices, stringent reliability&#13;
requirements, and increasing security challenges pose significant hurdles for current network&#13;
architectures. This dissertation addresses these challenges by proposing innovative frameworks&#13;
and mechanisms that enhance reliability, optimize resource utilization, and strengthen security&#13;
and trust management in next-generation mobile networks.&#13;
The first contribution of this dissertation focuses on reliability enhancements in 5G networks.&#13;
While existing mechanisms, such as Dual Connectivity (DC) and Network Function (NF)&#13;
redundancy, provide partial solutions, they do not fully resolve application-layer reliability&#13;
and dynamic server failover. To bridge this gap, this work introduces the Make-Before-Break-&#13;
Reliability (MBBR) and enhanced Make-Before-Break-Reliability (eMBBR) mechanisms. These&#13;
frameworks proactively establish redundant communication paths, ensuring seamless failovers&#13;
with minimal latency and service disruption. By extending reliability to the application layer&#13;
and integrating adaptive path selection and dynamic failover capabilities, these mechanisms&#13;
offer robust solutions for latency-sensitive and mission-critical applications.&#13;
The second major contribution addresses bandwidth optimization for industrial networks.&#13;
The black channel paradigm, widely adopted for industrial safety applications, relies heavily on&#13;
cyclic keep-alive messages to detect connection loss, leading to significant signaling overhead.&#13;
This dissertation proposes a novel solution leveraging 5G Channel State Information (CSI)&#13;
to replace cyclic messaging with real-time connection quality monitoring. By exposing CSI&#13;
metrics, such as Signal-to-Noise Ratio (SNR) and Channel Quality Indicator (CQI), to the&#13;
application layer, the proposed mechanism reduces bandwidth consumption while maintaining&#13;
the safety and reliability requirements of industrial networks.&#13;
Addressing the growing complexity of security requirements in IIoT, the third contribution&#13;
introduces the AF-based Security Framework (AERO) framework. This framework empowers&#13;
application providers to dynamically apply cryptographic mechanisms to the user plane,&#13;
overcoming the limitations of legacy protocols and eliminating the need for redundant security&#13;
layers. By ensuring backward compatibility and enabling both static and dynamic configuration&#13;
of user plane encryption, AERO enhances security while minimizing computational overhead&#13;
and reducing transmission delays.&#13;
The fourth and final contribution redefines trust management in mobile networks through&#13;
the SecUre deleGAtion of tRust (SUGAR) framework. Traditional trust models, which rely&#13;
on identity chips for each connected device, are becoming increasingly impractical in the&#13;
IoE era, where billions of devices require connectivity. The SUGAR framework introduces a&#13;
delegation-based trust model, allowing Parent Devices (PaDs) to delegate trust to multiple&#13;
Child Devices (ChDs) securely. This approach eliminates the need for individual identity chips,&#13;
significantly reducing costs and enhancing scalability. Integration with System-on-a-Chip&#13;
(SoC)-based identity enclaves further strengthens the security of trust credentials.&#13;
The findings of this dissertation offer substantial contributions to both academia and&#13;
industry. The proposed frameworks effectively address critical gaps in current 5G standards&#13;
and provide valuable contributions for developing the 6G framework. By enhancing reliability,&#13;
optimizing bandwidth, and redefining security and trust management, this dissertation provides&#13;
a comprehensive foundation for the design and deployment of next-generation mobile networks.&#13;
Furthermore, the solutions presented are adaptable to a wide range of applications, including&#13;
industrial automation, autonomous systems, and smart city infrastructures.&#13;
In conclusion, this dissertation represents a significant step toward realizing the full&#13;
potential of next-generation mobile networks. By addressing key challenges in reliability,&#13;
resource optimization, security, and trust management, the proposed frameworks pave the way&#13;
for scalable, secure, and efficient mobile ecosystems that are essential for the dynamic and&#13;
interconnected world of the future.</description>
      <author>Malla Reddy Sama</author>
      <category>doctoralthesis</category>
      <guid>https://opus4.kobv.de/opus4-uni-koblenz/frontdoor/index/index/docId/2608</guid>
      <pubDate>Mon, 03 Nov 2025 09:40:24 +0100</pubDate>
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