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Der Abschlussbericht fasst die Ergebnisse des Forschungs- und Entwicklungsprojektes 2015/2016 im Studiengang Master of Science Wirtschaftsinformatik (FH Münster) zur Themenstellung "Kryptowährungen und Smart Contracts" zusammen. Das Projekt analysierte die Einsatzzwecke, Potenziale und Architekturen von Blockchain-Anwendungen. Des Weiteren wurden verschiedene Fragestellungen zum Nutzen der Blockchain-Technologie in modernen Geschäftsprozessen und zu den technischen Herausforderungen mittels der Entwicklung zweier Prototypen betrachtet. Der erste Prototyp realisiert eine eigene Blockchain, in der verschiedene Angriffsszenarien durchgespielt werden können. Der zweite Prototyp realisiert eine Clearinghouse-Anwendung in Form einer verteilten Smart-Contract-Implementierung (in Ethereum). Der Bericht vermittelt einen Überblick über Ansätze, Strukturen, interne Abläufe und Rahmenbedingungen aktueller Blockchain-Implementierungen. Die erzielten Ergebnisse verdeutlichen neben dem Nutzen auch die Besonderheiten und Einschränkungen der Blockchain-Technologie.
Multi-part Nanocubes
(2016)
This thesis describes the development of Multi-part Nanocubes. It is a further development of Nanocubes, an in-memory data structure for spatiotemporal data cubes. "Nanocubes provides you with real-time visualization of large datasets. Slice and dice your data with respect to space, time, or some of your data attributes, and view the results in real-time on a web browser over heatmaps, bar charts, and histograms." Partitioning the structure to parallelize the build process as well as merging query results is the principal part of this document. Furthermore, a new memory management (slab allocation with offset pointers) was implemented to enable 32-bit support and faster load times of already built nanocubes. Porting the project to Windows and implementing on-the-fly compression and decompression of nanocube files is also described.
Astronomy is driven by the quest for higher sensitivity and improved angular resolution in order to detect fainter or smaller objects. The far-infrared to submillimeter domain is a unique probe of the cold and obscured Universe, harboring for instance the precious signatures of key elements such as water. Space observations are mandatory given the blocking effect of our atmosphere. However the methods we have relied on so far to develop increasingly larger telescopes are now reaching a hard limit, with the JWST illustrating this in more than one way (e.g. it will be launched by one of the most powerful rocket, it requires the largest existing facility on Earth to be qualified). With the Thinned Aperture Light Collector (TALC) project, a concept of a deployable 20 m annular telescope, we propose to break out of this deadlock by developing novel technologies for space telescopes, which are disruptive in three aspects: • An innovative deployable mirror whose topology, based on stacking rather than folding, leads to an optimum ratio of collecting area over volume, and creates a telescope with an eight times larger collecting area and three times higher angular resolution compared to JWST from the same pre-deployed volume; • An ultra-light weight segmented primary mirror, based on electrodeposited Nickel, Composite and Honeycomb stacks, built with a replica process to control costs and mitigate the industrial risks; • An active optics control layer based on piezo-electric layers incorporated into the mirror rear shell allowing control of the shape by internal stress rather than by reaction on a structure. We present in this paper the roadmap we have built to bring these three disruptive technologies to technology readiness level 3. We will achieve this goal through design and realization of representative elements: segments of mirrors for optical quality verification, active optics implemented on representative mirror stacks to characterize the shape correction capabilities, and mechanical models for validation of the deployment concept. Accompanying these developments, a strong system activity will ensure that the ultimate goal of having an integrated system can be met, especially in terms of (a) scalability toward a larger structure, and (b) verification philosophy.
Von Januar bis März 2015 wurde eine Umfrage an deutschen Hochschulen durchgeführt, um den aktuellen Entwicklungs- und Einführungsstand von Dokumentenmanagementsystemen (DMS) an deutschen Hochschulen zu erheben. Dabei standen unter anderem folgende zentrale Fragestellungen im Vordergrund: wer nutzt aktuell bereits Dokumentenmanagementsysteme und warum (nicht), welche Aufgaben werden mit dem System unterstützt, welche konkrete Software wird eingesetzt und welche Herausforderungen und Erfolgsfaktoren existieren bei der Einführung von Dokumentenmanagementsystemen? Die Studie soll unter anderem Hochschulen als Informations- und Diskussionsgrundlage in eigenen DMS-Einführungsprojekten dienen.
„Menschen sind seltsame Wesen“ – Manager (wie Konsumenten) sind Menschen, deren Entscheidungs-Verhalten Gegenstand der Verhaltensökonomik ist. Ihr sind eine Vielzahl sozialwissenschaftlicher Disziplinen zuzuordnen. Gemeinsame Klammer der Beiträge dieses Bandes ist die Beschäftigung mit dem sozialen Verhalten von Individuen, Grup-pen und Organisationen im betrieblichen Kontext. Hierzu werden beginnend mit der Auseinandersetzung der Persönlichkeitstypen von Entscheidern ausgewählte grundle-gende Erkenntnisse zu den fundamentalen Management-Prozess-Phasen Entscheiden und Führen aufgezeigt. Mit Beiträgen zur Behavioral Ethics sowie zur Interpretation von Management aus soziologischer Perspektive endet dieser Band 3 der ITB-Schriftenreihe.
We have developed and manufactured a unimorph deformable mirror for space telescopes based on piezoelectric actuation. The mirror features 44 actuators, has an aperture of 50 mm, and is designed to reproduce low-order Zernike modes with a stroke of several tens of µm. We assessed the space compliance by operating the mirror in thermal vacuum, and exposing it to random and sinusoidal vibrations, as well as to ionizing irradiation. Additionally, the operational life time and the laser power handling capability were tested. The mirror was successfully operated in thermal vacuum at 100 K. We report on the conducted tests and the methods used to evaluate the mirror´s performance, and discuss the compliance with the demanded requirements
We have developed, manufactured and tested a unimorph deformable mirror for space applications based on piezoelectric actuation. The mirror was designed for the correction of low-order Zernike modes with a stroke of several tens of micrometers over a clear aperture of 50 mm. It was successfully tested in thermal vacuum, underwent lifetime tests, and was exposed to random vibrations, sinusoidal vibrations, and to ionizing radiation. We report on design considerations, manufacturing of the mirror, and present the test results. Furthermore, we discuss critical design parameters, and how our mirror could be adapted to serve recently proposed space telescopes such as HDST and TALC.
Inhaltsübersicht: 1 Historische Entwicklung der Containerschifffahrt 2 Aktuelle Marktsituation 2.1 Krise 2.2 Bildung von Allianzen 2.3 Große Containerschiffe 3 Analysekriterien zur Beurteilung der Wirtschaftlichkeit von Containerschiffen 3.1 Aufwandsfaktoren 3.1.1 Anschaffungskosten 3.1.2 Treibstoffbedarf 3.1.3 Personalbedarf 3.1.4 Gebühren für die Nutzung von Schifffahrtsstraßen 3.1.5 Hafengebühren 3.1.6 Wartungs-, Reparatur- und Klassifikationskosten 3.1.7 Wartungsintensität 3.1.8 Versicherungskosten 3.1.9 Schadstoff-Emissionen 3.2 Nutzenfaktoren 3.2.1 Ladekapazität 3.2.2 Auslastung 3.2.3 Fahrgeschwindigkeit 3.2.4 Umschlagsgeschwindigkeit 3.2.5 Manövrierfähigkeit 3.2.6 Ladungssicherheit 3.2.7 Routenflexibilität 3.2.8 Verfügbarkeit geeigneter Häfen 3.2.9 Verwertungsmöglichkeiten 4 Vorteile großer Containerschiffe 5 Nachteile großer Containerschiffe 6 Profiteure der Situation 7 Persönliches Fazit
Sediment Bypass Tunnels are operated to divert sediment around reservoirs reducing reservoir sedimentation. A major drawback of these tunnels is severe invert abrasion due to high velocity and sediment flows. There is an urgent need to establish innovative measurement systems of sediment transport rates in SBTs. In this paper, three bedload measuring systems, namely hydrophones, geophones, and newly developed plate microphones are introduced and compared. The Koshibu SBT is planned to operate from 2016. Plate microphones combined with geophones and other planned systems are installed in the tunnel. Results of preliminary tests and installation plans of bedload
measurement are presented.
For long term use of dams, it is required to develop methods of sediment management in reservoirs.
As one method, Sediment BypassTunnels (SBT) are operated in Japan and Switzerland to prevent reservoir sedimentation. SBT reduces sedimentation in reservoirs by routing the incoming sediments around the dam. SBT, however, is prone to severe invert abrasion caused by high sediment flux. Therefore, it is necessary to establish a measurement system of sediment transport rates in the SBT. A geophone was experimentally investigated in a laboratory flume at ETH Zurich. The sediment transport rate is calculated based on the plate vibration caused by hitting of gravels. In this paper, in order to alleviate disadvantages of a geophone, two newly developed sensor systems, a plate microphone and plate vibration sensor, are suggested and the results of their calibration experiments are shown. Finally, they are compared with the existing methods.