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- parallel breadth-first search (3)
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- Betriebswirtschaftslehre (2)
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This paper gives an overview of the development of Fair Trade in six European countries: Austria, France, Germany, the Netherlands, Switzerland and the United Kingdom. After the description of the food retail industry and its market structures in these countries, the main European Fair Trade organizations are analyzed regarding their role within the Fair Trade system. The following part deals with the development of Fair Trade sales in general and with respect to the products coffee, tea, bananas, fruit juice and sugar. An overview of the main activities of national Fair Trade organizations, e.g. public relation activities, completes the analysis. This study shows the enormous upswing of Fair Trade during the last decade and the reasons for this development. Nevertheless, it comes to the conclusion that Fair Trade is still far away from being an essential part of the food retail industry in Europe.
The ability to track moving people is a key aspect of autonomous robot systems in real-world environments. Whilst for many tasks knowing the approximate positions of people may be sufficient, the ability to identify unique people is needed to accurately count people in the real world. To accomplish the people counting task, a robust system for people detection, tracking and identification is needed.
Updating a shared data structure in a parallel program is usually done with some sort of high-level synchronization operation to ensure correctness and consistency. The realization of such high-level synchronization operations is done with appropriate low-level atomic synchronization instructions that the target processor architecture provides. These instructions are costly and often limited in their scalability on larger multi-core / multi-processor systems. In this paper, a technique is discussed that replaces atomic updates of a shared data structure with ordinary and cheaper read/write operations. The necessary conditions are specified that must be fulfilled to ensure overall correctness of the program despite missing synchronization. The advantage of this technique is the reduction of access costs as well as more scalability due to elided atomic operations. But on the other side, possibly more work has to be done caused by missing synchronization. Therefore, additional work is traded against costly atomic operations. A practical application is shown with level-synchronous parallel Breadth-First Search on an undirected graph where two vertex frontiers are accessed in parallel. This application scenario is also used for an evaluation of the technique. Tests were done on four different large parallel systems with up to 64-way parallelism. It will be shown that for the graph application examined the amount of additional work caused by missing synchronization is neglectible and the performance is almost always better than the approach with atomic operations.
Seit vielen Jahren ist der Übergang von der Schule zur Hochschule eines der zentralen Themen für didaktische Theorien, empirische Untersuchungen und bildungspolitische Diskussionen. Ein dabei identifiziertes großes Problem vieler Studierender ist, dass mit dem Abitur „eine Lebensphase mit meist klar definierten Zielen in überschaubaren räumlichen, familiären und schulischen Strukturen endet“.1) Entscheidet man sich als Studierender gegen die nicht akademische Laufbahn und nimmt ein Hochschulstudium auf, trifft man auf Studienstrukturen und -bedingungen, die einem fremd und chaotisch vorkommen können. Der Weg an die Hochschulen ermöglicht den Individuen eine Reihe von Optionen, ist aber leider auch immer mit Risiken und Unsicherheiten behaftet. Entscheidungen müssen nun selbstständig vorbereitet und getroffen werden und dies in einem Umfeld, das sehr unterschiedlich im Vergleich zur bekannten Schulstruktur sein kann.
Informatikerinnen und Informatiker aller Fachrichtungen müssen die grundlegenden Konzepte, Methoden und Verfahren, die der Entwicklung und dem Einsatz von Informations- und Kommunikationstechnologien zugrunde liegen, verstehen und bei der Lösung von Problemen anwenden können. Das Buch stellt die algebraischen und zahlentheoretischen Grundlagen dafür vor und wendet diese bei der Lösung praktischer Problemstellungen, wie modulare Arithmetik, Primzahltests und Verschlüsselung an. Das Verständnis der Begriffe und deren Zusammenhänge und Zusammenwirken wird u.a. durch Lernziele, integrierte Übungsaufgaben mit Musterlösungen und Marginalien unterstützt. Das Buch ist zum Selbststudium gut geeignet.
The analytical pyrolysis technique hyphenated to gas chromatography–mass spectrometry (GC–MS) has extended the range of possible tools for the characterization of synthetic polymers and copolymers. Pyrolysis involves thermal fragmentation of the analytical sample at temperatures of 500–1400 °C. In the presence of an inert gas, reproducible decomposition products characteristic for the original polymer or copolymer sample are formed. The pyrolysis products are chromatographically separated using a fused-silica capillary column and are subsequently identified by interpretation of the obtained mass spectra or by using mass spectra libraries. The analytical technique eliminates the need for pretreatment by performing analyses directly on the solid or liquid polymer sample. In this article, application examples of analytical pyrolysis hyphenated to GC–MS for the identification of different polymeric materials in the plastic and automotive industry, dentistry, and occupational safety are demonstrated. For the first time, results of identification of commercial light-curing dental filling material and a car wrapping foil by pyrolysis–GC–MS are presented.
The analytical pyrolysis technique hyphenated to gas chromatography–mass spectrometry (GC–MS) has extended the range of possible tools for the characterization of synthetic polymers and copolymers. Pyrolysis involves thermal fragmentation of the analytical sample at temperatures of 500–1400 °C. In the presence of an inert gas, reproducible decomposition products characteristic for the original polymer or copolymer sample are formed. The pyrolysis products are chromatographically separated using a fused-silica capillary column and are subsequently identified by interpretation of the obtained mass spectra or by using mass spectra libraries. The analytical technique eliminates the need for pretreatment by performing analyses directly on the solid or liquid polymer sample. In this article, application examples of analytical pyrolysis hyphenated to GC–MS for the identification of different polymeric materials in the plastic and automotive industry, dentistry, and occupational safety are demonstrated. For the first time, results of identification of commercial light-curing dental filling material and a car wrapping foil by pyrolysis–GC–MS are presented.
The work being described in this paper is the result of a cooperation project between the Institute of Visual Computing at the Bonn-Rhein-Sieg University of Applied Sciences, Germany and the Laboratory of Biomedical Engineering at the Federal University of Uberlândia, Brazil. The aim of the project is the development of a virtual environment based training simulator which enables for better and faster learning the control of upper limb prostheses. The focus of the paper is the description of the technical setup since learning tutorials still need to be developed as well as a comprehensive evaluation still needs to be carried out.
Unternehmen nutzen teilweise veraltete Betriebssystem-Software, die nicht mehr gewartet werden. Beispiele sind "Windows XP" oder ab 14.05.2015 "Windows Server 2003" der Firma Microsoft. Das Paper analysiert die Situation im Hinblick auf signifikante Risiken wie z.B. die mögliche Versagung von Jahresabschlusstestaten und schlägt Maßnahmen für das Management vor.
This article describes an approach to rapidly prototype the parameters of a Java application run on the IBM J9 Virtual Machine in order to improve its performance. It works by analyzing VM output and searching for behavioral patterns. These patterns are matched against a list of known patterns for which rules exist that specify how to adapt the VM to a given application. Adapting the application is done by adding parameters and changing existing ones. The process is fully automated and carried out by a toolkit. The toolkit iteratively cycles through multiple possible parameter sets, benchmarks them and proposes the best alternative to the user. The user can, without any prior knowledge about the Java application or the VM improve the performance of the deployed application and quickly cycle through a multitude of different settings to benchmark them. When tested with the representative benchmarks, improvements of up to 150% were achieved.
Automatisierungstechnik
(2014)
Die Automatisierungstechnik wird aus praktischer Sicht mit vielen Beispielen und zahlreichen Bildern veranschaulicht. Studenten ingenieurwissenschaftlicher Fachrichtungen sowie Ingenieure und Techniker in der Ausbildung und der beruflichen Praxis können sich auf dem Stand der Technik selbständig einarbeiten.
Hybrid system models exploit the modelling abstraction that fast state transitions take place instantaneously so that they encompass discrete events and the continuous time behaviour for the while of a system mode. If a system is in a certain mode, e.g. two rigid bodies stick together, then residuals of analytical redundancy relations (ARRs) within certain small bounds indicate that the system is healthy. An unobserved mode change, however, invalidates the current model for the dynamic behaviour. As a result, ARR residuals may exceed current thresholds indicating faults in system components that have not happened. The paper shows that ARR residuals derived from a bond graph cannot only serve as fault indicators but may also be used for bond graph model-based system mode identification. ARR residuals are numerically computed in an off-line simulation by coupling a bond graph of the faulty system to a non-faulty system bond graph through residual sinks. In real-time simulation, the faulty system model is to be replaced by measurements from the real system. As parameter values are uncertain, it is important to determine adaptive ARR thresholds that, given uncertain parameters, allow to decide whether the dynamic behaviour in a current system mode is the one of the healthy system so that false alarms or overlooking of true faults can be avoided. The paper shows how incremental bond graphs can be used to determine adaptive mode-dependent ARR thresholds for switched linear time-invariant systems with uncertain parameters in order to support robust fault detection. Bond graph-based hybrid system mode identification as well as the determination of adaptive fault thresholds is illustrated by application to a power electronic system easy to survey. Some simulation results have been analytically validated.
A cost-efficient alternative to outside-in tracking systems for pointing interaction with large displays is to equip the pointing device with a camera, whose images are matched to display content. This work presents the Dynamic Marker Camera Tracking (DMCT) framework for display-based camera tracking. It accounts for typical display characteristics and uses dynamic on-screen markers overlaid to the display content that follow the camera. An example marker implementation and a tracking recovery method are presented. DMCT can measure pointing locations with sub-millimeter precision in large tracking volumes and computes 6-DoF camera poses for 3D interaction. 60 Hz update rate and 24 ms latency were achieved. DMCT's main limitation is the visible marker interfering with display content. In pointing effciency, the prototype is comparable to an OptiTrack system.
Case Management
(2014)
Humans exhibit flexible and robust behavior in achieving their goals. We make suitable substitutions for objects, actions, or tools to get the job done. When opportunities that would allow us to reach our goals with less effort arise, we often take advantage of them. Robots are not nearly as robust in handling such situations. Enabling a domestic service robot to find ways to get a job done by making substitutions is the goal of our work. In this paper, we highlight the challenges faced in our approach to combine Hierarchical Task Network planning, Description Logics, and the notions of affordances and conceptual similarity. We present open questions in modeling the necessary knowledge, creating planning problems, and enabling the system to handle cases where plan generation fails due to missing/unavailable objects.
Chemie kann im Studium ganz schön kompliziert sein, besonders wenn es etwas mehr in die Tiefe geht. Dass man aber auch komplizierte Dinge leicht verständlich und bisweilen amüsant erklären kann, beweist dieses Lehrbuch. Stefanie Ortanderl und Ulf Ritgen erklären die Grundlagen der Chemie und so erfahren Sie, was Sie über Atommodelle, Bindungstypen und das Periodensystem wissen sollten.
Software repository data, for example in issue tracking systems, include natural language text and technical information, which includes anything from log files via code snippets to stack traces. However, data mining is often only interested in one of the two types e.g. in natural language text when looking at text mining. Regardless of which type is being investigated, any techniques used have to deal with noise caused by fragments of the other type i.e. methods interested in natural language have to deal with technical fragments and vice versa. This paper proposes an approach to classify unstructured data, e.g. development documents, into natural language text and technical information using a mixture of text heuristics and agglomerative hierarchical clustering. The approach was evaluated using 225 manually annotated text passages from developer emails and issue tracker data. Using white space tokenization as a basis, the overall precision of the approach is 0.84 and the recall is 0.85.
This work describes extensions to the well-known Distributed Coordination Function (DCF) model to account for IEEE802.11n point-to-point links. The developed extensions cover adaptions to the throughput and delay estimation for this type of link as well peculiarities of hardware and implementations within the Linux Kernel. Instead of using simulations, the approach was extensively verified on real-world deployments at various link distances. Additionally, trials were conducted to optimize the CWmin values and the number of retries to maximize throughput and minimize delay. The results of this work can be used to estimate the properties of long-distance 802.11 links beforehand, allowing the network to be planned more accurately.
Realism and plausibility of computer controlled entities in entertainment software have been enhanced by adding both static personalities and dynamic emotions. Here a generic model is introduced that allows findings from real-life personality studies to be transferred to a computational model. Adaptive behavior patterns are enabled by introducing dynamic event-based emotions. The advantages of this model have been validated using a four-way crossroad in a traffic simulation. Driving agents using the introduced model enhanced by dynamics were compared to agents based on static personality profiles and simple rule-based behavior. The results show that adding a dynamic factor to agents improves perceivable plausibility and realism.
Dysregulation of IL12 Signaling As a Novel Cause of an Autoimmune Lymphoproliferative like Syndrome
(2014)
„Ein Wort gibt das andere“ – zwischenmenschliche Kommunikation folgt bestimmten Regeln. Wer diese Mechanismen durchschaut, kann nicht nur eigene Gesprächsziele besser erreichen, sondern auch andere Menschen leichter verstehen und erfolgreicher mit ihnen interagieren.
Nicht von ungefähr zählt Kommunikationskompetenz zu den gefragtesten Soft Skills in Beruf und Alltag. Diese Einführung in die Theorie und Praxis der Kommunikation erläutert die Prinzipien effizienter Kommunikation nach wie vor ein Klassiker zur Veranschaulichung von gruppendynamischen Prozessen und Rollenverhalten. Das Lehrbuch erklärt das Phänomen der Kommunikation anhand verschiedener sozialpsychologischer Untersuchungen, Theorien, Beispiele und Sichtweisen, regt zu einer erweiterten Reflexion darüber an und liefert konkrete Hinweise und Übungen, welche die eigene Kommunikationspraxis effektiv verbessern.
(Verlagsangaben)
Der Beitrag beschreibt die Einführung eines prozessorientierten Qualitätsmanagementsystems (QM-System) an der Hochschule Bonn-Rhein-Sieg. Diese wurde 1995 gegründet und hat derzeit rund 6500 Studierende an drei Standorten: Sankt Augustin, Rheinbach und Hennef. Hier lehren und forschen rund 140 engagierte Professorinnen und Professoren, unterstützt durch über 300 Mitarbeiterinnen und Mitarbeiter und ebenso viele Lehrbeauftragte aus Wirtschaft, Politik und Wissenschaft. Angesichts der Verteilung über mehrere Standorte mit unterschiedlichen fachlichen Schwerpunkt- und Zielsetzungen wird der Aufbau eines gemeinsamen QM zugleich als Organisationsentwicklungsprozess gestaltet. Strategische Basis dafür ist der Hochschulentwicklungsplan. Begonnen wurde Ende 2009 mit der Erstellung einer Feasibility-Studie, um die zukünftige Rolle von QM an der Hochschule zu untersuchen und einen gangbaren Weg für die Integration in die Hochschulentwicklung zu beschreiben. Der folgende Bericht gibt einen Überblick über die daraus entstandenen Aktivitäten sowie einen Eindruck von den damit verbundenen Chancen und Schwierigkeiten. Einer der größten Erfolge besteht bislang in der Anerkennung von QM als Daueraufgabe der Hochschule und ihrer Mitglieder. Herausfordernd ist, diesen Anspruch im Hochschulalltag umzusetzen.
Robots, which are able to carry out their tasks robustly in real world environments, are not only desirable but necessary if we want them to be more welcome for a wider audience. But very often they may fail to execute their actions successfully because of insufficient information about behaviour of objects used in the actions.
In contrast to projection-based systems, large, high resolution multi-display systems offer a high pixel density on a large visualization area. This enables users to step up to the displays and see a small but highly detailed area. If the users move back a few steps they don't perceive details at pixel level but will instead get an overview of the whole visualization. Rendering techniques for design evaluation and review or for visualizing large volume data (e.g. Big Data applications) often use computationally expensive ray-based methods. Due to the number of pixels and the amount of data, these methods often do not achieve interactive frame rates.
A view direction based (VDB) rendering technique renders the user's central field of view in high quality whereas the surrounding is rendered with a level-of-detail approach depending on the distance to the user's central field of view. This approach mimics the physiology of the human eye and conserves the advantage of highly detailed information when standing close to the multi-display system as well as the general overview of the whole scene. In this paper we propose a prototype implementation and evaluation of a focus-based rendering technique based on a hybrid ray tracing/sparse voxel octree rendering approach.
Vor dem Hintergrund knapper Ressourcen, dem zunehmendem Reha-Bedarf und der politischen Diskussion um eine demografische Anpassung der Reha-Budgets gewinnt der Nachweis der Ergebnisqualität medizinischer Reha-Leistungen weiter an zentraler Bedeutung (z. B. Haaf, 2005; Steiner et al., 2009). Die kontinuierliche und klinikvergleichende Überprüfung der Behandlungsergebnisse ist darüber hinaus ein wichtiger Baustein eines funktionierenden Qualitätsmanagements (Schmidt et al., in press). Sie ermöglicht ein "Lernen von den Besten" und führt zu organisatorischen Lernprozessen (Toepler et. al., 2010).
During space missions astronauts suffer from cardiovascular deconditioning, when they are exposed to microgravity conditions. Until now, no specific drugs are available for effective countermeasures, since the underlying mechanism is not completely understood. Endothelial cells (ECs) and smooth muscle cells (SMCs) play crucial roles in a variety of cardiovascular functions, many of which are regulated via P2 receptors. However, their function in ECs and SMCs under microgravity condition is still unknown. In this study, ECs and SMCs were isolated from bovine aorta and differentiated from human mesenchymal stem cells (hMSCs), respectively. Subsequently, the cells were verified based on specific markers. An altered P2 receptor expression pattern was detected during the commitment of hMSC towards ECs and SMCs. The administration of natural and artificial P2 receptor agonists and antagonists directly affected the differentiation process. By using EC growth medium as conditioned medium, a vessel cell model was created to culture SMCs and vice versa. Within this study, we were able to show for the first time that the expression of some P2 receptors were altered in ECs and SMCs grown for 24h under simulated microgravity conditions. On the other hand, in some P2 receptor expressions such as P2X7 conditioned medium compensated this change.
In conclusion, our data show that P2 receptors play an important functional role in hMSC differentiation towards ECs and SMCs. Since some P2 receptor artificial ligands are already used as drugs for patients with cardiovascular diseases, it is reasonable to assume that in the future they might be promising candidates for treating cardiovascular deconditioning.
Breadth-First Search is a graph traversal technique used in many applications as a building block, e.g., to systematically explore a search space or to determine single source shortest paths in unweighted graphs. For modern multicore processors and as application graphs get larger, well-performing parallel algorithms are favorable. In this paper, we systematically evaluate an important class of parallel algorithms for this problem and discuss programming optimization techniques for their implementation on parallel systems with shared memory. We concentrate our discussion on level-synchronous algorithms for larger multicore and multiprocessor systems. In our results, we show that for small core counts many of these algorithms show rather similar performance behavior. But, for large core counts and large graphs, there are considerable differences in performance and scalability influenced by several factors, including graph topology. This paper gives advice, which algorithm should be used under which circumstances.
People are getting older because of the demographic changes and the rate of disabled people is also going up. This article shows the challenge for BPMTool developer due to these circumstances. It illustrates how these changes impact the usage of BPM-Tools based on an Evaluation of an exemplary BPMTool (Cooper & Patterson, 2007) in terms of IT-Usability and IT-Accessibility. This evaluation was conducted in a research laboratory at the university.
Adapting plans to changes in the environment by finding alternatives and taking advantage of opportunities is a common human behavior. The need for such behavior is often rooted in the uncertainty produced by our incomplete knowledge of the environment. While several existing planning approaches deal with such issues, artificial agents still lack the robustness that humans display in accomplishing their tasks. In this work, we address this brittleness by combining Hierarchical Task Network planning, Description Logics, and the notions of affordances and conceptual similarity. The approach allows a domestic service robot to find ways to get a job done by making substitutions. We show how knowledge is modeled, how the reasoning process is used to create a constrained planning problem, and how the system handles cases where plan generation fails due to missing/unavailable objects. The results of the evaluation for two tasks in a domestic service domain show the viability of the approach in finding and making the appropriate goal transformations.
Diese Formelsammlung zeigt die mathematischen Formeln auf, die in den
Wirtschaftswissenschaften notwendig von Bedarf sind. Sie ist interdisziplinär
zielgerichtet und unterstützt sämtliche Bereiche der Ökonomik. Das Verständnis der Formeln und deren praktische Anwendung werden sinnvoll unterstützt durch nützliche Hilfen und Beispiele. Das Buch ist ein unverzichtbares Tool sowohl für den Studierenden als auch für den Verantwortlichen in Wirtschaft, Management, Verwaltung, Politik und Lehre.
Die Formelsammlung zeigt die statistischen Formeln auf, die in den Wirtschaftswissenschaften notwendig von Bedarf sind. Sie ist interdisziplinär zielgerichtet und unterstützt sämtliche Bereiche der Ökonomik. Das Verständnis der Formeln und deren praktische Anwendung werden sinnvoll unterstützt durch nützliche Hilfen und Beispiele. Das Buch ist ein unverzichtbares Tool sowohl für den Studierenden als auch für den Verantwortlichen in Wirtschaft, Management, Verwaltung, Politik und Lehre.
GRI4-Guidelines
(2014)
In diesem Beitrag wird gezeigt, dass das Corporate Social Responsibility-Controlling (CSR-Controlling) im Zuge der neuen Berichterstattungsvorgaben der Global Reporting Initiative (GRI) vor neuen Herausforderungen steht. Die neue GRI-4-Version fordert über erweiterte und neue Pflichtstandardangaben die CSR-Umsetzung in höchster Niveauausprägung ein und setzt neue Maßstäbe an die CSR-Gütekriterien „Transparenz“ und „Rechenschaftslegung“ in der gesamten Supply Chain. In der Analyse werden die für den zukünftigen GRI-4-Berichtseinstieg erforderlichen Anpassungsschritte dargestellt und in einem GRI-3.1-versus-GRI-4-Vergleich indikatorenbezogen erläutert.
Nachhaltigkeit als Megatrend. Die Arbeit der Weltkommission für Umwelt und Entwicklung unter Vorsitz von Brundtland machte bereits 1987 deutlich, dass v.a. das Management von Gemeingütern wie Ozeanen und der Atmosphäre, die Erhaltung des Weltfriedens, die weltweite Bevölkerungsentwicklung, die globale Ernährungssicherheit, die begrenzten Energieressourcen sowie die Folgen des Wirtschaftswachstums globale Herausforderungen darstellen, die nur durch eine nachhaltige Entwicklung gemeistert werden können.
Over the past two decades social protection has gained importance at the international and the national level of many low and middle income countries. Despite reforms in this sector being a global phenomenon, they differ from country to country. Traditional efforts to explain these dif- ferences focus on domestic factors. Yet it remains unclear how international influences and interdependencies contrib- ute to policy change. The study ‘International Policy Learn- ing and Policy Change’ aims at providing an answer to this question, by focusing on ‘soft governance’ via horizontal processes, meaning processes between equal actors. The studie was carried out in two parts. While in Part I the cur- rent state of the art in relevant research fields was assessed, in Part II the findings from Part I were used to conduct a survey which analyses the role of policy networks.
The perceived direction of “up” is determined by gravity, visual information, and an internal estimate of body orientation (Mittelstaedt, 1983; Dyde et al., 2006). Is the gravity level found on other worlds sufficient to maintain gravity’s contribution to this perception? Difficulties in stability reported anecdotally by astronauts on the lunar surface (NASA 1972) suggest that the moon’s gravity may not be, despite this value being far above the threshold for detecting linear acceleration. Knowing how much gravity is needed to provide a reliable orientation cue is required for training and preparing astronauts for future missions to the moon, mars and beyond.
In den letzten Jahren ist das Thema Nachhaltigkeit zu einem Schlüsselthema in vielen wissenschaftlichen und gesellschaftlichen Diskursen geworden. Ausgehend von natur-, technik-, politik- und zunehmend wirtschaftswissenschaftlichen Auseinandersetzung mit Fragestellungen im Kontext von Nachhaltigkeit, sind diese in den Mittelpunkt gesellschaftlicher und politischer Wahrnehmung gerückt.
Kriminalistik
(2014)