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A SIEM Architecture for Advanced Anomaly Detection
Get PDFDramatic increases in the number of cyber security attacks and breaches toward businesses and organizations have been experienced in recent years. The negative impacts of these breaches not only cause the stealing and compromising of sensitive information, malfunctioning of network devices, disruption of everyday operations, financial damage to the attacked business or organization itself, but also may navigate to peer businesses/organizations in the same industry. Therefore, prevention and early detection of these attacks play a significant role in the continuity of operations in IT-dependent organizations. At the same time detection of various types of attacks has become extremely difficult as attacks get more sophisticated, distributed and enabled by Artificial Intelligence (AI). Detection and handling of these attacks require sophisticated intrusion detection systems which run on powerful hardware and are administered by highly experienced security staff. Yet, these resources are costly to employ, especially for small and medium-sized enterprises (SMEs). To address these issues, we developed an architecture -within the GLACIER project- that can be realized as an in-house operated Security Information Event Management (SIEM) system for SMEs. It is affordable for SMEs as it is solely based on free and open-source components and thus does not require any licensing fees. Moreover, it is a Self-Contained System (SCS) and does not require too much management effort. It requires short configuration and learning phases after which it can be self-contained as long as the monitored infrastructure is stable (apart from a reaction to the generated alerts which may be outsourced to a service provider in SMEs, if necessary). Another main benefit of this system is to supply data to advanced detection algorithms, such as multidimensional analysis algorithms, in addition to traditional SIEMspecific tasks like data collection, normalization, enrichment, and storage. It supports the application of novel methods to detect security-related anomalies. The most distinct feature of this system that differentiates it from similar solutions in the market is its user feedback capability. Detected anomalies are displayed in a Graphical User Interface (GUI) to the security staff who are allowed to give feedback for anomalies. Subsequently, this feedback is utilized to fine-tune the anomaly detection algorithm. In addition, this GUI also provides access to network actors for quick incident responses. The system in general is suitable for both Information Technology (IT) and Operational Technology (OT) environments, while the detection algorithm must be specifically trained for each of these environments individually
Evaluating the discriminatory power of the velocity field diagram and timed-up-and-go test in determining the fall status of community-dwelling older adults: a cross-sectional observational study
Get PDFBackground
Systematic reviews demonstrated that gait variables are the most reliable predictors of future falls, yet are rarely included in fall screening tools. Thus, most tools have higher specificity than sensitivity, hence may be misleading/detrimental to care. Therefore, this study aimed to determine the validity, and reliability of the velocity field diagram (VFD -a gait analytical tool), and the Timed-up-and-go test (TUG)-commonly used in Nigeria as fall screening tools, compared to a gold standard (known fallers) among community-dwelling older adults.
Method
This is a cross-sectional observational study of 500 older adults (280 fallers and 220 non-fallers), recruited by convenience sampling technique at community health fora on fall prevention. Participants completed a 7-m distance with the number of steps and time it took determined and used to compute the stride length, stride frequency, and velocity, which regression lines formed the VFD. TUG test was simultaneously conducted to discriminate fallers from non-fallers. The cut-off points for falls were: TUG times ≥ 13.5 s; VFD’s intersection point of the stride frequency, and velocity regression lines (E1) ≥ 3.5velots. The receiver operating characteristic (ROC) area under the curves (AUC) was used to explore the ability of the E1 ≥ 3.5velots to discriminate between fallers and non-fallers. The VFD’s and TUG’s sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were determined. Alpha was set at p < 0.05.
Results
The VFD versus TUG sensitivity, specificity, PPV and NPV were 71%, 27%, 55%, and 42%, versus 39%, 59%, 55%, and 43%, respectively. The ROC’s AUC were 0.74(95%CI:0.597,0.882, p = 0.001) for the VFD. The optimal categorizations for discrimination between fallers/non-fallers were ≥ 3.78 versus ≤ 3.78 for VFD (fallers versus non-fallers prevalence is 60.71% versus 95.45%, respectively), with a classification accuracy or prediction rate of 0.76 unlike TUG with AUC = 0.53 (95% CI:0.353,0.700, p = 0.762), and a classification accuracy of 0.68, and optimal characterization of ≥ 12.81 s versus ≤ 12.81 (fallers and non-fallers prevalence = 92.86% versus 36.36%, respectively).
Conclusion
The VFD demonstrated a fair discriminatory power and greater reliability in identifying fallers than the TUG, and therefore, could replace the TUG as a primary tool in screening those at risk of falls
Dokumentation des Projekts "Nutzung offener Bücherschränke" 11.03.-11.07.2022
Get PDFDer Projektbericht beschreibt die erfolgten Arbeitsschritte im Studierendenprojekt "Nutzung offener Bücherschränke" im Sommersemester 2022 an der Hochschule Hannover im Rahmen des 6. Semesters im Studiengang Informationsmanagement – berufsbegleitend.
Der Bericht beschreibt den Projektverlauf von Festlegung und Entwicklung eines Untersuchungsdesign bis zur Auswertung und Visualisierung der erhobenen Daten. Dabei wird auch auf Schwierigkeiten und sowohl entwickelte als auch verworfene Lösungsansätze während der einzelnen Projektphasen eingegangen
Pop-Up-Bibliotheken. Eine Machbarkeitsstudie
Get PDFPop-Up-Stores dienen diversen Unternehmen, von großen Konzernen bis hin zum kleinen Start-Up-Projekt, als einzigartige Möglichkeit, neuartige Produkte für potenzielle Kunden sichtbar zu machen, deren Attraktivität zu testen und unkonventionelles Marketing zu betreiben. Auch in Deutschland sind die Läden auf Zeit mittlerweile ein etabliertes Konzept. Insbesondere in Großstädten sind sie prägende Elemente von Einkaufszentren, Fußgängerzonen, etc., die durch ihr kurzzeitiges Erscheinen und ihre einzigartigen Angebote auch eine Antwort auf die dynamische Entwicklung von Innenstädten und das Innovationsbedürfnis von Konsumenten darstellen. Durch die begrenzte Verfügbarkeit, die damit zumindest suggerierte Exklusivität und den besonderen Eventcharakter erzeugen Pop-Up-Stores ein hohes Maß an Aufmerksamkeit, Mundpropaganda sowie Attraktivität und sind dabei für die durchführenden Unternehmen annähernd risikolos.
Ob und wie dieses Konzept auch für Bibliotheken geeignet ist, welche Vorteile Bibliotheken aus einem derartigen Projekt gegebenenfalls ziehen können und was bei der Umsetzung einer Pop-Up-Bibliothek zu beachten ist, ist Inhalt der vorliegenden Machbarkeitsstudie. Im Rahmen der ersten Recherchen wurde bereits ersichtlich, dass die Bandbreite von Pop-Up-Konzepten an sich sehr groß ist. Darüber hinaus zeigte sich auch, dass Bibliotheken auf unterschiedlichste Weise dazu in der Lage sind, diese Konzepte wiederum an die eigenen Bedürfnisse bzw. Gegebenheiten anzupassen: Vom Testen neuer Raum- oder Veranstaltungsangebote bis zum Schaffen temporärer Bibliotheksstandorte in bisher wenig bis nicht erschlossenen Stadtteilen, und nicht zuletzt als imagewirksame Öffentlichkeitsarbeit – die Möglichkeiten der Ausrichtung einer Pop-Up-Bibliothek sind so divers, wie die Bibliotheksarbeit an sich
Agile Software-Entwicklung & Remote Work: Auswirkungen auf die Interaktion und Autonomie agiler Teams
Get PDFDie Covid-19 Pandemie hat zu einem signifikanten Anstieg der Remote Work geführt. Die Veränderung in der Interaktion und Kollaboration ist für viele agile Teams eine Herausforderung gewesen. Diverse Studien zeigen unterschiedliche Effekte und Auswirkungen auf die Zusammenarbeit agiler Teams während der Pandemie. So ist die Kommunikation sachlicher und zielgerichteter geworden. Ebenso wird eine Verminderung des sozialen Austauschs in den Teams berichtet. Unser Artikel thematisiert die Veränderung der Interaktion in agilen Teams durch die Remote Work. Wir haben eine qualitative Fallstudie bei einem agilen Software-Entwicklungsteam bei Otto durchgeführt. Unsere Ergebnisse zeigen einen Zusammenhang zwischen den Auswirkungen auf die Interaktion und der persönlichen Autonomie der Team-Mitglieder. Darüber hinaus haben wir keine signifikanten negativen Effekte durch die veränderte Interaktion auf die agile Arbeitsweise festgestellt
Causal analyses with target trial emulation for real-world evidence removed large self-inflicted biases: systematic bias assessment of ovarian cancer treatment effectiveness
Get PDFBackground and Objectives:
Drawing causal conclusions from real-world data (RWD) poses methodological challenges and risk of bias. We aimed to systematically assess the type and impact of potential biases that may occur when analyzing RWD using the case of progressive ovarian cancer.
Methods:
We retrospectively compared overall survival with and without second-line chemotherapy (LOT2) using electronic medical records. Potential biases were determined using directed acyclic graphs. We followed a stepwise analytic approach ranging from crude analysis and multivariable-adjusted Cox model up to a full causal analysis using a marginal structural Cox model with replicates emulating a reference randomized controlled trial (RCT). To assess biases, we compared effect estimates (hazard ratios [HRs]) of each approach to the
HR of the reference trial.
Results:
The reference trial showed an HR for second line vs. delayed therapy of 1.01 (95% confidence interval [95% CI]: 0.82e1.25). The corresponding HRs from the RWD analysis ranged from 0.51 for simple baseline adjustments to 1.41 (95% CI: 1.22e1.64) accounting for immortal time bias with time-varying covariates. Causal trial emulation yielded an HR of 1.12 (95% CI: 0.96e1.28).
Conclusion:
Our study, using ovarian cancer as an example, shows the importance of a thorough causal design and analysis if one is expecting RWD to emulate clinical trial results
Phänomenologische, sozialtheoretische und beratungsethische Reflexionen zur Chatseelsorge
Get PDFZu den Phänomenen digitalisierter Kommunikation ist inzwischen auch die Chatberatung zu zählen. Vor diesem Hintergrund zeigt sich die Notwendigkeit, Kommunikation via Chat phänomenologisch zu durchdringen, sozialtheoretisch einzuordnen und beratungsethisch kritisch zu reflektieren. Dies geschieht am Beispiel der Chatseelsorge, die zugleich von Beratung unterschieden wird
H2 production from the radiolysis of aqueous suspensions of ZnO nanoparticles by 5.5 MeV He2+ ions
Get PDFThe effects of ion beam irradiation on aqueous suspensions of metal oxides has received relatively little attention compared to γ-ray irradiation despite being a highly prevalent process in spent nuclear fuel storage and reprocessing. This is partly due to the difficulties associated with homogeneously irradiating condensed-phase matter using α-particles. Here, we report experimental yields of H2 from the 5.5 MeV He2+ ion irradiation of aqueous suspensions of ZnO nanoparticles. The obtained results are compared to our previously measured results for the γ-radiolysis of the same system. The amount of H2 increases linearly with adsorbed dose for all studied concentrations. The measured yields are of the same order of magnitude as those observed for pure water, but decrease with increasing water content. Overall, the yields follow a similar trend to those observed for γ-ray radiolysis
Das Informationsverhalten von Studierenden im digitalen Zeitalter - Eine Handlungsempfehlung für Bibliotheken
Get PDFMit der zunehmenden Digitalisierung hat die Informations- und Bibliothekslandschaft einen massiven Wandel erlebt. Insbesondere die Ausbreitung des Internets hat dafür gesorgt, dass man sich bei der Informationsrecherche nicht mehr nur auf die analogen Bibliotheksbestände beschränken muss. Ziel dieser Arbeit ist es, das wissenschaftliche Informationsverhalten von Studierenden im digitalen Zeitalter zu untersuchen. Unter Anwendung eines Systematic Literature Reviews werden dabei internationale Forschungsstudien der jüngsten elf Jahren analysiert und anschließend eine Handlungsempfehlung für Bibliotheken gegeben, wie sie die Informationskompetenz der Studierenden zeitgemäß fördern können. Unter anderem ging aus den Ergebnissen hervor, dass besonders Studienanfänger*innen Defizite im Bereich der wissenschaftlichen Recherche und Quellenevaluation haben.With increasing digitalization, the information and library landscape has experienced massive change. In particular, the spread of the Internet has ensured that information research no longer has to be limited to the analogue stocks of the libraries. The aim of this work is to examine the scientific information behavior of students in the digital age. Using a systematic literature review, international research studies of the last eleven years are analyzed and then recommendations are made for libraries on how to promote students' information literacy in a contemporary manner. Among other things, the results showed that first-year students still have deficits in the area of scientific research and source evaluation
Towards a Didactic Concept for Heterogeneous Target Groups in Digital Learning Environments - First Course Implementation
Get PDFIn the context of the ongoing digitization of interdisciplinary subjects, the need for digital literacy is increasing in all areas of everyday life. Furthermore, communication between science and society is facing new challenges, not least since the COVID-19 pandemic. In order to deal with these challenges and to provide target-oriented online teaching, new educational concepts for the transfer of knowledge to society are necessary. In the transfer project “Zukunftslabor Gesundheit” (ZLG), a didactic concept for the creation of E-Learning classes was developed. A key factor for the didactic concept is addressing heterogeneous target groups to reach the broadest possible spectrum of participants. The concept has already been used for the creation of the first ZLG E-Learning courses. This article outlines the central elements of the developed didactic concept and addresses the creation of the ZLG courses. The courses created so far appeal to different target groups and convey diverse types of knowledge at different levels of difficulty