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UMTS versus WLAN und WIMAX

UMTS versus WLAN und WIMAX

Dimitri Benkowski

AV Akademikerverlag
2012
pokkari
Inhaltlich unver nderte Neuauflage. Im Jahr 2000 ersteigerten die sechs gro en Mobilfunknetzbetreiber in Deutschland, Telekom, Vodafone, Mobilcom, O2, E-Plus und Quam die Lizenzen f r UMTS, eine neue Technologie der dritten Generation zur drahtlosen Daten- und Sprach bertragung. Die beteiligten Telekommunika-tions-unternehmen waren sich sicher, dass eine UMTS-Lizenz die Zukunft des eigenen Unternehmens sichert und es ihnen erm glicht, wettbewerbsf hig zu bleiben. Nach der gro en Euphoriewelle kam aber schnell die Ern chterung. Die Netzbetreiber hatten mit den hohen Kosten f r die UMTS-Lizenzen zu k mpfen, hinzu kamen immense Kosten zur Errichtung der UMTS-Netze. Unterdessen fand WLAN einen steigenden Zuspruch unter den mobilen Nutzern und drohte, besonders in den Ballungszentren, eine Vormacht-stellung einzunehmen. Inwiefern WLAN eine Konkurrenz f r UMTS darstellt, ob es einen Wettbewerb zwischen UMTS und WLAN gibt und mit welchen Anwendungen die jeweiligen Technologien profitabel f r einen Infrastruktur-Provider sein werden, gilt es in der vorliegenden Arbeit zu kl ren. Der Arbeit liegt das Five Forces Modell nach Porter zugrunde. Dieser Ansatz wurde vom Autor auf UMTS und WLAN bertragen und vertieft.
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Visual Complexity and Intelligent Computer Graphics Techniques Enhancements

Visual Complexity and Intelligent Computer Graphics Techniques Enhancements

Dimitri Plemenos; Georgios Miaoulis

Springer-Verlag Berlin and Heidelberg GmbH Co. K
2009
sidottu
In this book, three main notions will be used in the editors search of improvements in various areas of computer graphics: Artificial Intelligence, Viewpoint Complexity and Human Intelligence. Several Artificial Intelligence techniques are used in presented intelligent scene modelers, mainly declarative ones. Among them, the mostly used techniques are Expert systems, Constraint Satisfaction Problem resolution and Machine-learning. The notion of viewpoint complexity, that is complexity of a scene seen from a given viewpoint, will be used in improvement proposals for a lot of computer graphics problems like scene understanding, virtual world exploration, image-based modeling and rendering, ray tracing and radiosity. Very often, viewpoint complexity is used in conjunction with Artificial Intelligence techniques like Heuristic search and Problem resolution. The notions of artificial Intelligence and Viewpoint Complexity may help to automatically resolve a big number of computer graphics problems. However, there are special situations where is required to find a particular solution for each situation. In such a case, human intelligence has to replace, or to be combined with, artificial intelligence. Such cases, and proposed solutions are also presented in this book.
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Tunnelling and Tunnel Mechanics

Tunnelling and Tunnel Mechanics

Dimitrios Kolymbas

Springer-Verlag Berlin and Heidelberg GmbH Co. K
2010
nidottu
Tunnellingisanexcitingandrapidlyevolvingtechnology.Pioneeringprocesses are commonplace and innovative thinking continues to rewrite the rules. In civil engineering, tunnelling is one of the few areas where new horizons are constantly being discovered. But for the profession to reach its full potential, tunnelling needs to be more accessible to those talented engineers in search of new challenges and keen to make lasting contributions to society. In the eyes of too many, tunnelling is still seen as the exclusive domain of too few: a mysterious art form, accessible only to those who have already spent countless years perfecting their approach, a skill whose secrets remain suppressed. Over the following pages I hope to show that tunnelling need not be a closed book. I have omitted methods and de?nitions that depended more on h- torical precedent than modern scienti?c evaluation. Instead of confusing the reader with countless details and de?nitions that are in any case open to change, I have focused on the underlying concepts that make tunnelling e- ier to grasp. Sowhilethisbookisdesignedtoprovideaconcise,up-to-dateandusefulframe of reference to all those newly quali?ed and engaged in the ?eld, I hope that it will also serve to reveal to those talented engineers who thought they had found their niche above ground the very real opportunities and unanswered questions that await them underground.
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Visual Complexity and Intelligent Computer Graphics Techniques Enhancements

Visual Complexity and Intelligent Computer Graphics Techniques Enhancements

Dimitri Plemenos; Georgios Miaoulis

Springer-Verlag Berlin and Heidelberg GmbH Co. K
2011
nidottu
In this book, three main notions will be used in the editors search of improvements in various areas of computer graphics: Artificial Intelligence, Viewpoint Complexity and Human Intelligence. Several Artificial Intelligence techniques are used in presented intelligent scene modelers, mainly declarative ones. Among them, the mostly used techniques are Expert systems, Constraint Satisfaction Problem resolution and Machine-learning. The notion of viewpoint complexity, that is complexity of a scene seen from a given viewpoint, will be used in improvement proposals for a lot of computer graphics problems like scene understanding, virtual world exploration, image-based modeling and rendering, ray tracing and radiosity. Very often, viewpoint complexity is used in conjunction with Artificial Intelligence techniques like Heuristic search and Problem resolution. The notions of artificial Intelligence and Viewpoint Complexity may help to automatically resolve a big number of computer graphics problems. However, there are special situations where is required to find a particular solution for each situation. In such a case, human intelligence has to replace, or to be combined with, artificial intelligence. Such cases, and proposed solutions are also presented in this book.
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