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Novel Automated Three-Dimensional Genome Scanning Based on the Nuclear Architecture of Telomeres
(2011)
A method for minimum range extension with improved accuracy in triangulation laser range finder
(2011)
While industrialized countries are becoming service economies, all countries are becoming global. As competition becomes more global, understanding and accommodating the needs of international customers with different cultural backgrounds has become increasingly important. This study highlights cross-cultural perceptions of service problems in the tourist industry.
Nowadays, we input text not only on stationary devices, but also on handheld devices while walking, driving, or commuting. Text entry on the move, which we term as nomadic text entry, is generally slower. This is partially due to the need for users to move their visual focus from the device to their surroundings for navigational purposes and back. To investigate if better feedback about users' surroundings on the device can improve performance, we present a number of new and existing feedback systems: textual, visual, textual & visual, and textual & visual via translucent keyboard. Experimental comparisons between the conventional and these techniques established that increased ambient awareness for mobile users enhances nomadic text entry performance. Results showed that the textual and the textual & visual via translucent keyboard conditions increased text entry speed by 14% and 11%, respectively, and reduced the error rate by 13% compared to the regular technique. The two methods also significantly reduced the number of collisions with obstacles.
Das Thema Querdenken ist so aktuell, spannend und interessant, dass sich Prof. Dr. Jens Böcker von der Hochschule Bonn-Rhein-Sieg nach unseren ersten Gesprächen dazu entschlossen hat, eine Projektarbeit für seine Studenten zu diesem Thema zu vergeben. Prof. Dr. Böcker ist Professor im Fachbereich Wirtschaftswissenschaften für BWL mit dem Schwerpunkt Marketing. Das „Forschungsprojekt Querdenken“ wurde von einer Gruppe Studenten um Manuel Hammes als Projektleiter im Sommersemester 2010 bei Prof. Dr. Böcker durchgeführt.
Aufgrund der zunehmenden Behandlung von sozialen Netzwerken in den Medien war es das Ziel der Arbeit das Geschäftsmodell von sozialen Netzwerken näher zu analysieren. Die Arbeit zeigt, dass soziale Online-Netzwerke zu den Diensten im Internet gehören, die zwar schon länger existieren, ihren eigentlichen Durchbruch aber erst in den letzten Jahren erlebten. Zu Beginn als reine Kommunikationsplattform genutzt, werden sie heute zur allgemeinen Freizeitgestaltung verwendet und integrieren sich zunehmend in das alltägliche Leben. Die Arbeit beschäftigt sich mit den ökonomischen Besonderheiten von sozialen Online-Netzwerken. Analysiert werden Netzwerkeffekte, Angebots- und Nachfrageverhalten, kritische Masse-Phänomene, Tippy markets, Netzwerkgesetze, Lock-In-Effekte und Wechselkosten. Es wird untersucht, ob und inwieweit sich hinter den sozialen Online-Netzwerken auch klar erkennbare Geschäftsmodelle verbergen. Aufbauend auf einer kritischen Auseinandersetzung mit der Vielfalt existierender Geschäftsmodelle erfolgt die Entwicklung eines eigenen tragfähigen Ansatzes. Auf dieser Basis wird eine Analyse existierender Online-Netzwerke und eine Beurteilung ihres Innovationsgrades vorgenommen.
Hochschulbibliotheken haben heutzutage neben der traditionellen Aufgabe der Literaturversorgung und Informationsversorgung auch die Aufgabe, über ihre Website im Internet präsent zu sein und sich dort als zentraler Informationsanbieter zu positionieren. Die Webauftritte haben dabei die Funktionen als Zugangspunkt und Vermittlungsstelle für Informationen sowie als Werbemittel bzw. Instrument der Öffentlichkeitsarbeit. Im Hinblick auf die immer stärkere Benutzerorientierung der Bibliotheken werden die Webangebote von fünf Universitätsbibliotheken und einer Fachhochschulbibliothek nach diversen Kriterien analysiert: es wird herausgearbeitet, welche Inhalte auf den Websites zu finden sind, die Struktur wird näher betrachtet, ebenso wie die Navigationsmöglichkeiten, die Sprache und Textgestaltung und das Design.
Erstellung des Online-Tutorials "Einführung in Fachdatenbanken und Fachportale der Niederlandistik"
(2011)
The usage of link quality based routing metrics significantly improves the quality of the chosen paths and by that the performance of the network. But, attackers may try to exploit link qualities for their purposes. Especially in tactical multi-hop networks, routing may fall prey to an attacker. Such routing attacks are a serious threat to communication. TOGBAD is a centralised approach, using topology graphs to detect routing attacks. In this paper, we enhance TOGBAD with the capability to detect fake link qualities. We use a Challenge/Response method to estimate the link qualities in the network. Based on this, we perform plausibility checks for the link qualities propagated by the nodes in the network. Furthermore, we study the impact of attackers propagating fake link qualities and present simulation results showing TOGBAD's detection rate.
Routing Attacks are a serious threat to communication in tactical MANETs. TOGBAD is a centralised approach, using topology graphs to detect such attacks. In this paper, we present TOGBAD's newly added wormhole detection capability. It is an adaptation of a wormhole detection method developed by Hu et al. This method is based on nodes' positions. We adapted it to the specific properties of tactical environments. Furthermore, we present simulation results which show TOGBAD's performance regarding the detection of wormhole attacks.
This thesis work presents the implementation and validation of image processing problems in hardware to estimate the performance and precision gain. It compares the implementation for the addressed problem on a Field Programmable Gate Array (FPGA) with a software implementation for a General Purpose Processor (GPP) architecture. For both solutions the implementation costs for their development is an important aspect in the validation. The analysis of the flexibility and extendability that can be achieved by a modular implementation for the FPGA design was another major aspect. This work is based upon approaches from previous work, which included the detection of Binary Large OBjects (BLOBs) in static images and continuous video streams [13, 15]. One addressed problem of this work is the tracking of the detected BLOBs in continuous image material. This has been implemented for the FPGA platform and the GPP architecture. Both approaches have been compared with respect to performance and precision. This research project is motivated by the MI6 project of the Computer Vision research group, which is located at the Bonn-Rhein-Sieg University of Applied Sciences. The intent of the MI6 project is the tracking of a user in an immersive environment. The proposed solution is to attach a light emitting device to the user for tracking the created light dots on the projection surface of the immersive environment. Having the center points of those light dots would allow the estimation of the user’s position and orientation. One major issue that makes Computer Vision problems computationally expensive is the high amount of data that has to be processed in real-time. Therefore, one major target for the implementation was to get a processing speed of more than 30 frames per second. This would allow the system to realize feedback to the user in a response time which is faster than the human visual perception. One problem that comes with the idea of using a light emitting device to represent the user, is the precision error. Dependent on the resolution of the tracked projection surface of the immersive environment, a pixel might have a size in cm2. Having a precision error of only a few pixels, might lead to an offset in the estimated user’s position of several cm. In this research work the development and validation of a detection and tracking system for BLOBs on a Cyclone II FPGA from Altera has been realized. The system supports different input devices for the image acquisition and can perform detection and tracking for five to eight BLOBs. A further extension of the design has been evaluated and is possible with some constraints. Additional modules for compressing the image data based on run-length encoding and sub-pixel precision for the computed BLOB center-points have been designed. For the comparison of the FPGA approach for BLOB tracking a similar implementation in software using a multi-threaded approach has been realized. The system can transmit the detection or tracking results on two available communication interfaces, USB and RS232. The analysis of the hardware solution showed a similar precision for the BLOB detection and tracking as the software approach. One problem is the strong increase of the allocated resources when extending the system to process more BLOBs. With one of the applied target platforms, the DE2-70 board from Altera, the BLOB detection could be extended to process up to thirty BLOBs. The implementation of the tracking approach in hardware required much more effort than the software solution. The design of high level problems in hardware for this case are more expensive than the software implementation. The search and match steps in the tracking approach could be realized more efficiently and reliably in software. The additional pre-processing modules for sub-pixel precision and run-length-encoding helped to increase the system’s performance and precision.