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Usability Testing of Visual Policy Evaluation for Network Security Event Detection (2020)

Ahlers, Volker ; Hellmann, Bastian

The network security framework VisITMeta allows the visual evaluation and management of security event detection policies. By means of a "what-if" simulation the sensitivity of policies to specific events can be tested and adjusted. This paper presents the results of a user study for testing the usability of the approach by measuring the correct completion of given tasks as well as the user satisfaction by means of the system usability scale.

Unforced Errors bei Studien- und Abschlussarbeiten : Hinweise zur Endredaktion (2020)

Disterer, Georg

Vor der Abgabe einer Studien- oder Abschlussarbeit ist dringend eine sorgfältige Überarbeitung in Form einer Endredaktion vorzunehmen, um eine gute Bewertung der Arbeit nicht zu gefährden. Dies ist einfach; denn das Vorgehen ist schlicht und wenig aufwändig. Daher wäre es besonders ärgerlich, einfache Fehler nicht zu beheben und dafür Abzüge bei der Bewertung der Arbeit hinzunehmen. Für eine Endredaktion wird hiermit eine Anleitung vorgelegt.

An Immersive Multi-User Virtual Reality for Emergency Simulation Training: Usability Study (2020)

Lerner, Dieter ; Mohr, Stefan ; Schild, Jonas ; Göring, Martin ; Luiz, Thomas

Background: Virtual reality (VR) is increasingly used as simulation technology in emergency medicine education and training, in particular for training nontechnical skills. Experimental studies comparing teaching and learning in VR with traditional training media often demonstrate the equivalence or even superiority regarding particular variables of learning or training effectiveness. Objective: In the EPICSAVE (Enhanced Paramedic Vocational Training with Serious Games and Virtual Environments) project, a highly immersive room-scaled multi-user 3-dimensional VR simulation environment was developed. In this feasibility study, we wanted to gain initial insights into the training effectiveness and media use factors influencing learning and training in VR. Methods: The virtual emergency scenario was anaphylaxis grade III with shock, swelling of the upper and lower respiratory tract, as well as skin symptoms in a 5-year-old girl (virtual patient) visiting an indoor family amusement park with her grandfather (virtual agent). A cross-sectional, one-group pretest and posttest design was used to evaluate the training effectiveness and quality of the training execution. The sample included 18 active emergency physicians. Results: The 18 participants rated the VR simulation training positive in terms of training effectiveness and quality of the training execution. A strong, significant correlation (r=.53, P=.01) between experiencing presence and assessing training effectiveness was observed. Perceived limitations in usability and a relatively high extraneous cognitive load reduced this positive effect. Conclusions: The training within the virtual simulation environment was rated as an effective educational approach. Specific media use factors appear to modulate training effectiveness (ie, improvement through “experience of presence” or reduction through perceived limitations in usability). These factors should be specific targets in the further development of this VR simulation training.

Arbeitsklima in der Wirtschaftsinformatik spürbar verschieden (2020)

Disterer, Georg

Untersuchungen zu Berufen der Wirtschaftsinformatik bleiben weiterhin interessant, wenn sie helfen können, dem mittlerweile länger anhaltenden IT-Fachkräftemangel entgegenzuwirken. Eine Untersuchung der Hochschule Hannover zu Wirtschaftsinformatikern/-informatikerinnen in den ersten zehn Jahren im Beruf zeigt deren berufliche Ziele und die berufliche Zufriedenheit, die sie erlangen. Deutlich wird, dass Frauen und Männer das Arbeitsklima und die Arbeitsbedingungen sehr unterschiedlich wahrnehmen und daher auch unterschiedlich zufrieden sind. Dabei bemängeln Frauen vor allem Merkmale, die mit „fehlender Fairness“ zu beschreiben sind.

Expectancy, usage and acceptance by general practitioners and patients: exploratory results from a study in the German outpatient sector (2017)

Albrecht, Urs-Vito ; Afshar, Kambiz ; Illiger, Kristin ; Becker, Stefan ; Hartz, Tobias ; Breil, Bernhard ; Wichelhaus, Daniel ; von Jan, Ute

Objective: The study’s objective was to assess factors contributing to the use of smart devices by general practitioners (GPs) and patients in the health domain, while specifically addressing the situation in Germany, and to determine whether, and if so, how both groups differ in their perceptions of these technologies. Methods: GPs and patients of resident practices in the Hannover region, Germany, were surveyed between April and June 2014. A total of 412 GPs in this region were invited by email to participate via an electronic survey, with 50 GPs actually doing so (response rate 12.1%). For surveying the patients, eight regional resident practices were visited by study personnel (once each). Every second patient arriving there (inclusion criteria: of age, fluent in German) was asked to take part (paper-based questionnaire). One hundred and seventy patients participated; 15 patients who did not give consent were excluded. Results: The majority of the participating patients (68.2%, 116/170) and GPs (76%, 38/50) owned mobile devices. Of the patients, 49.9% (57/116) already made health-related use of mobile devices; 95% (36/38) of the participating GPs used them in a professional context. For patients, age (P<0.001) and education (P<0.001) were significant factors, but not gender (P>0.99). For doctors, neither age (P¼0.73), professional experience (P>0.99) nor gender (P¼0.19) influenced usage rates. For patients, the primary use case was obtaining health (service)-related information. For GPs, interprofessional communication and retrieving information were in the foreground. There was little app-related interaction between both groups. Conclusions: GPs and patients use smart mobile devices to serve their specific interests. However, the full potentials of mobile technologies for health purposes are not yet being taken advantage of. Doctors as well as other care providers and the patients should work together on exploring and realising the potential benefits of the technology.

Accuracy of Magnetometer-Guided Sentinel Lymphadenectomy after Intraprostatic Injection of Superparamagnetic Iron Oxide Nanoparticles in Prostate Cancer: The SentiMag Pro II Study (2019)

Winter, Alexander ; Engels, Svenja ; Goos, Philipp ; Süykers, Marie-Christin ; Gudenkauf, Stefan ; Henke, Rolf-Peter ; Wawroschek, Friedhelm

Radioisotope-guided sentinel lymph node dissection (sLND) has shown high diagnostic reliability in prostate (PCa) and other cancers. To overcome the limitations of the radioactive tracers, magnetometer-guided sLND using superparamagnetic iron oxide nanoparticles (SPIONs) has been successfully used in PCa. This prospective study (SentiMag Pro II, DRKS00007671) determined the diagnostic accuracy of magnetometer-guided sLND in intermediate- and high-risk PCa. Fifty intermediate- or high-risk PCa patients (prostate-specific antigen (PSA) >= 10 ng/mL and/or Gleason score >= 7; median PSA 10.8 ng/mL, IQR 7.4–19.2 ng/mL) were enrolled. After the intraprostatic SPIONs injection a day earlier, patients underwent magnetometer-guided sLND and extended lymph node dissection (eLND, followed by radical prostatectomy. SLNs were detected in in vivo and in ex vivo samples. Diagnostic accuracy of sLND was assessed using eLND as the reference. SLNs were detected in all patients (detection rate 100%), with 447 sentinel lymph nodes SLNs (median 9, IQR 6–12) being identified and 966 LNs (median 18, IQR 15–23) being removed. Thirty-six percent (18/50) of patients had LN metastases (median 2, IQR 1–3). Magnetometer-guided sLND had 100% sensitivity, 97.0% specificity, 94.4% positive predictive value, 100% negative predictive value, 0.0% false negative rate, and 3.0% additional diagnostic value (LN metastases only in SLNs outside the eLND template). In vivo, one positive SLN/LN-positive patient was missed, resulting in a sensitivity of 94.4%. In conclusion, this new magnetic sentinel procedure has high accuracy for nodal staging in intermediate- and high-risk PCa. The reliability of intraoperative SLN detection using this magnetometer system requires verification in further multicentric studies.

Systematizing IT Risks (2019)

Disterer, Georg

IT risks — risks associated with the operation or use of information technology — have taken on great importance in business, and IT risk management is accordingly important in the science and practice of information management. Therefore, it is necessary to systematize IT risks in order to plan, manage and control for different risk-specific measures. In order to choose and implement suitable measures for managing IT risks, effect-based and causebased procedures are necessary. These procedures are explained in detail for IT security risks because of their special importance.

Expectancy, usage and acceptance by general practitioners and patients: exploratory results from a study in the German outpatient sector (2017)

Albrecht, Urs-Vito ; Afshar, Kambiz ; Illiger, Kristin ; Becker, Stefan ; Hartz, Tobias ; Breil, Bernhard ; Wichelhaus, Daniel ; von Jan, Ute

Objective The study’s objective was to assess factors contributing to the use of smart devices by general practitioners (GPs) and patients in the health domain, while specifically addressing the situation in Germany, and to determine whether, and if so, how both groups differ in their perceptions of these technologies. Methods GPs and patients of resident practices in the Hannover region, Germany, were surveyed between April and June 2014. A total of 412 GPs in this region were invited by email to participate via an electronic survey, with 50 GPs actually doing so (response rate 12.1%). For surveying the patients, eight regional resident practices were visited by study personnel (once each). Every second patient arriving there (inclusion criteria: of age, fluent in German) was asked to take part (paper-based questionnaire). One hundred and seventy patients participated; 15 patients who did not give consent were excluded. Results The majority of the participating patients (68.2%, 116/170) and GPs (76%, 38/50) owned mobile devices. Of the patients, 49.9% (57/116) already made health-related use of mobile devices; 95% (36/38) of the participating GPs used them in a professional context. For patients, age (P < 0.001) and education (P < 0.001) were significant factors, but not gender (P > 0.99). For doctors, neither age (P = 0.73), professional experience (P > 0.99) nor gender (P = 0.19) influenced usage rates. For patients, the primary use case was obtaining health (service)-related information. For GPs, interprofessional communication and retrieving information were in the foreground. There was little app-related interaction between both groups. Conclusions GPs and patients use smart mobile devices to serve their specific interests. However, the full potentials of mobile technologies for health purposes are not yet being taken advantage of. Doctors as well as other care providers and the patients should work together on exploring and realising the potential benefits of the technology.

Preisdifferenzierung im Lebensmitteleinzelhandel – eine Literaturrecherche (2017)

Garashchuk, Julia ; Clasen, Michael ; Theuvsen, Ludwig

Preisdifferenzierung ist ein altbekanntes Thema und spielt eine wichtige Rolle bei der Preissetzung im Online-Handel. Das Ziel dieses Beitrages ist eine kurze Darstellung der relevanten Literatur zum Thema „Preisdifferenzierung im stationären und Online-Lebensmitteleinzelhandel".

Zukunftsforschung und strategische Vorausschau für die Landwirtschaft (2017)

Clasen, Michael

In diesem Artikel wird die strategische Vorausschau als eine Methode der Zukunftsforschung vorgestellt. Die entwickelten Szenarien können Entscheidern helfen, besser auf zukünftige Entwicklungen vorbereitet zu sein. Die GIL könnte eine Plattform sein, um Trends in der Landwirtschaft und Agrarinformatik zu identifizieren.

How do digital agricultural startups achieve critical mass? A qualitative analysis (2017)

Gubanova, Anna ; Clasen, Michael ; Theuvsen, Ludwig

This paper presents the results of 11 in-depth interviews with digital agricultural startups. The results reveal seven main assumptions startups make about the situation on the agricultural market, their target group, their growth and the challenges they face.

Ein wirtschaftliches Ausgleichssystem für regionale Regelenergie-Leistungen virtueller Biogas-Verbundkraftwerke (2017)

Schirmer, Daniel ; Eicke, Chris ; Iezzi, Marco ; Daum, Andreas ; Krause, Manfred

Der zukünftig steigende Bedarf an Bereitstellung von Regelenergie aus regenerativen Kraftwerken sowie sinkende EEG-Tarifstrukturen im Bereich Biogas führen zur Notwendigkeit einer Entwicklung alternativer Betriebs- und Vergütungsmodelle. Der vorliegende Beitrag skizziert ein wirtschaftliches Ausgleichssystem für virtuelle Biogas-Verbundkraftwerke. Es beschreibt, welche Kosten und Erlöse in virtuellen Biogas-Verbünden generiert werden, sofern diese teilautomatisiert und auf die regionale Netzstabilität fokussiert betrieben werden. Das wirtschaftliche Ausgleichssystem ist ein Teil des im Forschungsvorhaben VKV Netz zu entwickelnden Steuerungssystems für virtuelle Biogas-Verbundkraftwerke (http://vkvnetz.de).

Ein Steuerungssystem für den netzorientierten Betrieb virtueller Biogas-Verbundkraftwerke (2017)

Eicke, Chris ; Schirmer, Daniel ; Iezzi, Marco ; Daum, Andreas ; Krause, Manfred

Der zunehmende Anteil erneuerbarer Energien an der Stromproduktion Deutschlands erfordert einen ebenso steigenden Anteil der erneuerbaren Energien an der Bereitstellung von Regelenergie zur Stabilisierung der Stromnetze. Durch die Möglichkeit der zeitlichen Entkopplung von Gas- und Stromproduktion ist insbesondere die Biogastechnologie für die Bereitstellung von Regelenergie geeignet. Der vorliegende Beitrag skizziert ein Steuerungssystem für virtuelle Biogas-Verbundkraftwerke, dessen Oberziel die Stabilisierung des Stromnetzes ist. Die Entwicklung des Systems erfolgt im Zuge des Forschungsprojekts VKV Netz und wird durch das Bundesministerium für Wirtschaft und Energie gefördert.

Konzeption eines Web-basierten Portals zur Studiengangauswahl (2012)

Mack, Dagmar

Für die Studiengang-Auswahl existiert eine Reihe i. d. R. Fragebogen-gestützter Online-Studiengangfinder. Eine Analyse zeigte Optimierungspotenziale: Studienangebote sind meist auf ein Bundesland oder eine Hochschule beschränkt oder, allgemein beschrieben, die individuelle Studiengang-Auswahl ist nur mit Unschärfen möglich. Letzteres wirkt sich z. B. bei Bindestrich-Studiengängen (z. B. Wirtschaftsingenieurwesen) aus, die je nach Hochschule inhaltlich variieren können. Hier setzt das Portal an. Ziele sind: Bereitstellung der in der Sprachwelt Studieninteressierter gehaltenen Fragebögen, Möglichkeit für Hochschulen/Einrichtungen, Studiengänge bereitzustellen.

Delphi Method Variants in Information Systems Research: Taxonomy Development and Application (2017)

Strasser, Artur

Delphi is a frequently used research method in the information systems (IS) field. The last fifteen years have seen many variants of the Delphi Method proposed and used in IS research. However, these variants do not seem to be properly derived; while all variants share certain characteristics, their reasoning for differentiation inconsistently varies. It seems that researchers tend to create “new” Delphi Method variants, although the underlying modification of the Delphi Method is, in fact, minor. This leads to a heterogeneity of Delphi Method variants and undermines scientific rigor when using Delphi. The study addresses this deficit and (1) identifies different variants of Delphi and determines their characteristics, (2) critically reflects to what extent a clear distinction between these variants exists, (3) shows the clearly distinguishable Delphi Method variants and their characteristics, (4) develops a proposed taxonomy of Delphi Method variants, and (5) evaluates and applies this taxonomy. The proposed taxonomy helps clearly differentiate Delphi Method variants and enhances methodological rigor when using the Delphi Method.

Applying advisory agents on the semantic web for e-learning (2006)

Bruns, Ralf ; Dunkel, Jürgen ; Ossowski, Sascha

In this article, we present the software architecture of a new generation of advisory systems using Intelligent Agent and Semantic Web technologies. Multi-agent systems provide a well-suited paradigm to implement negotiation processes in a consultancy situation. Software agents act as clients and advisors, using their knowledge to assist human users. In the presented architecture, the domain knowledge is modeled semantically by means of XML-based ontology languages such as OWL. Using an inference engine, the agents reason, based on their knowledge to make decisions or proposals. The agent knowledge consists of different types of data: on the one hand, private data, which has to be protected against unauthorized access; and on the other hand, publicly accessible knowledge spread over different Web sites. As in a real consultancy, an agent only reveals sensitive private data, if they are indispensable for finding a solution. In addition, depending on the actual consultancy situation, each agent dynamically expands its knowledge base by accessing OWL knowledge sources from the Internet. Due to the standardization of OWL, knowledge models easily can be shared and accessed via the Internet. The usefulness of our approach is proved by the implementation of an advisory system in the Semantic E-learning Agent (SEA) project, whose objective is to develop virtual student advisers that render support to university students in order to successfully organize and perform their studies.

Establishing service management in SOA (2012)

Kleiner, Carsten ; Dunkel, Jürgen

In service-oriented architectures the management of services is a crucial task during all stages of IT operations. Based on a case study performed for a group of finance companies the different aspects of service management are presented. First, the paper discusses how services must be described for management purposes. In particular, a special emphasis is placed on the integration of legacy/non web services. Secondly, the service lifecycle that underlies service management is presented. Especially, the relation to SOA governance and an appropriate tool support by registry repositories is outlined.

A distributed architecture for real-time evacuation guidance in large smart buildings (2017)

Lujak, Marin ; Billhardt, Holger ; Dunkel, Jürgen ; Fernandez, Alberto ; Hermoso, Ramon ; Ossowski, Sascha

In this paper, we consider the route coordination problem in emergency evacuation of large smart buildings. The building evacuation time is crucial in saving lives in emergency situations caused by imminent natural or man-made threats and disasters. Conventional approaches to evacuation route coordination are static and predefined. They rely on evacuation plans present only at a limited number of building locations and possibly a trained evacuation personnel to resolve unexpected contingencies. Smart buildings today are equipped with sensory infrastructure that can be used for an autonomous situation-aware evacuation guidance optimized in real time. A system providing such a guidance can help in avoiding additional evacuation casualties due to the flaws of the conventional evacuation approaches. Such a system should be robust and scalable to dynamically adapt to the number of evacuees and the size and safety conditions of a building. In this respect, we propose a distributed route recommender architecture for situation-aware evacuation guidance in smart buildings and describe its key modules in detail. We give an example of its functioning dynamics on a use case.

A student project to qualify underprivileged adolescents (2009)

Disterer, Georg ; Fels, Friedrich

The objective of this student project was for the students to develop, conduct, and supervise a training course for basic work place applications (word processing and business graphics). Students were responsible for the planning, organizing and the teaching of the course. As participants, underprivileged adolescents took part in order to learn the handling of IT applications and therefore, improve their job skills and have a better chance to get into employment. Therefore the adolescents do the role of trainees at the course. Our students worked with a population that is continually overlooked by the field. As a result, the students trained to design and implement training courses, exercised to manage projects and increased their social responsibility and awareness concerning the way of life and living conditions of other young people. The underprivileged adolescents learned to use important business applications and increased their job skills and job chances. The overall design of our concept required extensive resources to supervise and to steer the students and the adolescents. The lecturers had to teach and to counsel the students and had to be on “stand-by” just in case they were needed to solve critical situations between the two groups of young people.

Die fünf Phasen der Unternehmensgründung (2007)

Buchholz, Günter

Eine Unternehmensgründung ist ein komplexes Vorhaben, dessen Risiken soweit wie möglich vermieden bzw. minimiert werden sollten. Dabei hilft eine sorgfältige Planung und Vorbereitung. Der Gründungsprozess lässt sich — von der Prüfung der Grundvoraussetzungen über den Business Plan, die Vorbereitung der Gründung sowie deren Realisierung bis zur Stabilisierung des Unternehmens — in fünf Phasen einteilen.

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