Enterprise social networks as digital infrastructures - understanding the utilitarian value of social media at the workplace

In this study, we first show that while both the perceived usefulness and perceived enjoyment of enterprise social networks impact employees’ intentions for continuous participation, the utilitarian value significantly outpaces its hedonic value. Second, we prove that the network’s utilitarian value is constituted by its digital infrastructure characteristics: versatility, adaptability, interconnectedness and invisibility-in-use. The study is set within a software engineering company and bases on quantitative survey research, applying partial least squares structural equation modeling

Small, but important: Traffic light proposals for detecting small traffic lights and beyond

Traffic light detection is a challenging problem in the context of self-driving cars and driver assistance systems. While most existing systems produce good results on large traffic lights, detecting small and tiny ones is often overlooked. A key problem here is the inherent downsampling in CNNs, leading to low-resolution features for detection. To mitigate this problem, we propose a new traffic light detection system, comprising a novel traffic light proposal generator that utilizes findings from general object proposal generation, fine-grained multi-scale features, and attention for efficient processing. Moreover, we design a new detection head for classifying and refining our proposals. We evaluate our system on three challenging, publicly available datasets and compare it against six methods. The results show substantial improvements of at least $12.6\%$ on small and tiny traffic lights, as well as strong results across all sizes of traffic lights.Comment: Accepted at ICVS 202

Improving the Tor Hidden Service Protocol Aiming at Better Performances

Offering services anonymously on the Internet using so-called location-hidden services requires complex protocols with many different nodes involved. These properties result in performance problems, e.g. a simple website request taking tens of seconds. This work describes a setup to measure the performance of hidden services using the worldwide Tor network. It analyzes the results and proposes changes to the protocol to improve the performance without losing anonymity

Immunhistochemische Untersuchung zum Auftreten von Komponenten des Insulin-like-Growth-Factor-Systems bei synovialer Chondromatose des Kiefergelenks

Die SC ist eine gutartige Erkrankung der großen Gelenke, deren Ursache bislang ungeklärt ist. Sie kann auch das Kiefergelenk betreffen. Pathogenetisch kommt es zur metaplastischen Bildung von Knorpelzellformationen in der Synovia, die in den Gelenkspalt des betroffenen Gelenks abgegeben werden und nach Sistieren der Metaplasie und Proliferation im Endstadium verkalken können. Die Erkrankung verursacht Schmerzen, Schwellung, Okklusionsstörungen und Krepitation. Es wird davon ausgegangen, dass sie von der Synovia und dem Gelenkknorpel ausgeht. Ziel dieser Arbeit war es, eine mögliche Beteiligung der Insulin-like-growth-factors (IGF-I/-II) und ihrer Bindungsproteine (IGFBP-1 bis -6) an der Entstehung der SC zu untersuchen. Dazu wurden 23 humane Resektionspräparate, die im Rahmen der chirurgischen Therapie der SC gewonnen wurden, immunhistochemisch gefärbt und mikroskopisch untersucht. Die Färbung wurde semiquantitativ bewertet. In der Auswertung zeigte sich, dass besonders die Chondro- und Fibrozyten und die Synovia betroffener Gelenke positiv bis stark positiv für beinahe alle untersuchten IGFs und IGFBPs anfärbten. Die darunter liegenden Gewebe bestehend aus Bindegewebe und chondroider Matrix wurden auch angefärbt, jedoch in geringerem Maße. Aus den Ergebnissen kann geschlossen werden, dass das IGF-System zur Pathogenese der SC beitragen könnte. Insbesondere IGF-I und -II und das ihre Wirkung verstärkende Bindungsprotein-5 scheinen dabei eine mögliche Rolle zu spielen.

First Results on the DOAS-Retrieval of OClO from SCIAMACHY Nadir Measurements

The Scanning Imaging Absorption Spectrometer for Atmospheric Chartography was launched successfully onboard ENVISAT on March 1, 2002. It observes solar radiation transmitted, backscattered from the atmosphere and reflected from the ground in nadir, limb and occultation viewing modes. Chlorinedioxide (OClO), an important indicator for stratospheric chlorine activation, can be measured in the UV spectral range by Differential Optical Absorption Spectroscopy (DOAS). First results of the DOAS retrieval of OClO slant column densities (SCDs) from the SCIAMACHY measurements are presented. The influence of several parameters like the wavelength range chosen as fitting window or the reference spectra included in the fit on the quality of the retrieval is examined. It is found that a proper correction of polarisation features in the spectra is essential for a good DOAS analysis of OClO. The OClO SCDs derived from SCIAMACHY are compared to measurements of the Global Ozone Monitoring Experiment (GOME) which has successfully measured OClO since 1995. SCIAMACHY flies in the same orbit, but measures approx. 30 minutes earlier than GOME. As OClO shows a strong diurnal variation, this leads to differences in the observed column densities, which may be useful to investigate the photochemistry of OClO and related compounds. Also, the spatial resolution of SCIAMACHY is higher (30*60 km^2 compared to 40*320 km^2 for GOME), which will allow a more detailed study of small scale effects like e.g. chlorine activation in mountain waves

A Requirements Analysis of Business-To-Business Integration

Ever fiercer competition has forced enterprises not only to optimize their own operations but also to cooperate with their suppliers and customers along their supply chains. Thus, competition today usually takes place between supply chains and not between individual enterprises. Business-To-Business integration (B2Bi) is a major task of supply chain management (SCM), and although it already has been researched for years, B2Bi is still an area of active research with a plethora of research questions and according approaches. Hence, management of B2Bi projects necessitates the identification of relevant requirements which is a far from trivial task. This paper identifies a core set of B2Bi challenges and deduces a comprehensive set of B2Bi requirements that are particularly useful for tackling the challenges identified. The derivation of B2Bi requirements follows an inductive approach that is based on the analysis of integration standards, reference architectures and related literature. In order to operationalize the B2Bi requirements for further analysis and concrete B2Bi projects, the requirements are classified according to the abstraction layers of a B2Bi schema. Thus, this report not only offers a requirements check list for B2Bi projects but also helps in deciding when to address which requirements during the course of a B2Bi project

Digital Transformation in Higher Education – New Cohorts, New Requirements?

Digital transformation refers to changes that digital technologies cause and that influence various aspects of human life. Previous researchers mainly focused on the impact of the digital transformation in the context of commercial organisations and business processes. In this study, we aim to examine how digital transformation affects universities and students. We examine differences and changes in the usage of collaboration and communication platforms between different groups of members at the university and within the university lifecycle. To gain new insights, a qualitative case study with semi-structured interviews was conducted. One of the main results shows that Bachelor and Master students prefer the usage of social network sites for collaboration and communication while Ph.D. students and employees do not. Even though an increasing number of modern platforms for direct communication is offered, the results show that the communication between the groups of students and employees still takes place via email