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Technological innovation in forest harvestingMännikkö, Nancy Farm 25 August 2008 (has links)
Scholars in science and technology studies have long been concerned with a variety of issues revolving around technological change, such as explaining the origins of technological innovation and arguing for or against technological determinism. This thesis reviews a number of theoretical models developed by historians, philosophers, sociologists, and other scholars to explain technological change. A case study of technological innovations in industnal forestry and timber harvesting practices provides a basis for a critique of these previously proposed models and for an argument for a new model. This model, an ecological model, suggests homeostatic pressures play a major role in the innovative processes within any technological system. / Master of Science
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Speed and immobility in urban space and cinemaLau, Chi-chung, 劉治中 January 2009 (has links)
published_or_final_version / Comparative Literature / Master / Master of Philosophy
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Correction of Chromatic Aberration with an Electron MirrorMauck, Michael Stewart 01 January 1993 (has links)
The theoretical basis for using electron mirrors as correctors of chromatic aberration is presented and an experimental verification of correction of chromatic aberration is demonstrated. A hyperbolic electrostatic electron mirror operating in its converging range and at unity magnification was used as a corrector. A novel separating system with deflections taking place at image planes was developed to implement the mirror without impairing the resolution. Correction was demonstrated in an electron optical probe system. The chromatic aberration was measured by means of the shadows cast by a fine mesh placed near the final image. The experimental method and equipment are described. The experiment serves as a verification of the theory as well as a successful test of the method of separating the electron beams traveling to and from the mirror.
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Innovative activity and technological change in China and its regions evidence from Chinese domestic patents /Yin, Hong. January 2007 (has links)
Thesis (Ph. D.)--University of Delaware, 2007. / Principal faculty advisor: William Latham, III, Dept. of Economics. Includes bibliographical references.
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Data acquisition techniques for next generation wireless sensor networksEhsan, Samina 12 March 2012 (has links)
The meteoric rise and prevalent usage of wireless networking technologies for mobile
communication applications have captured the attention of media and imagination of
public in the recent decade. One such proliferation is experienced in Wireless Sensor
Networks (WSNs), where multimedia enabled elements are fused with integrated
sensors to empower tightly coupled interaction with the physical world. As a promising
alternative to antiquated wired systems and traditional WSNs in a multitude of novel application
scenarios, the newly renovated WSNs have inspired a wide range of research
among which investigation on data acquisition techniques is a fundamental one. In this
dissertation, we address the problem of data acquisition in next generation WSNs. As
wireless sensors are powered with limited energy resources while they are expected to
work in an unattended manner for a long duration, energy conservation stands as the
primal concern. Also, to enable in-situ sensing in different rate-constrained applications,
routing decisions should care about the medium access feasibility of achievable
end-to-end data rates. Driven by the fact, we first design cross-layer medium contention
aware routing schemes for rate-constrained traffic in single-channel WSNs that maximize
network lifetime. Three sufficient conditions on rate feasibility, referred to as
rate-based, degree-based, and mixed constraints, are incorporated into the routing formulations
to guarantee the practical viability of the routing solutions. Next, with the aim
to mitigate interference and hence to enhance network capacity, we extend our work
by proposing energy and cross-layer aware routing schemes for multichannel access
WSNs that account for radio, MAC contention, and network constraints. In that context,
we first derive three new sets of sufficient conditions that ensure feasibility of data
rates in multichannel access WSNs. Then, utilizing these sets, we devise three different
MAC-aware routing optimization schemes, each aiming to maximize the network
lifetime while meeting data rate requirements of end-to-end flows. Finally, we perform
extensive simulation studies to evaluate and compare the performance of the proposed
routing approaches under various network conditions. So far works are done in milieu
of WSNs with both fixed access node and sensor nodes. In the subsequent part
of the dissertation, we present the continuation of our work focusing on reliable data
acquisition in Mobile WSNs for a promising application namely free-ranging animal
tracking/monitoring. To accomplish that goal, we concentrate on providing sufficient
conditions on access-point density that limit the likelihood of buffer overflow. We first
derive sufficient access-point density conditions that ensure that the data loss rates are
statistically guaranteed to remain below a given threshold. Then, we evaluate and validate
the derived theoretical results with both synthetic and real-world data. / Graduation date: 2012
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The role of internal competition in knowledge creation : an empirical study in Japanese firms /Matsuo, Makoto, January 1900 (has links)
Texte remanié de: Ph. D. dissertation--Management learning--University of Lancaster, 2004. / Bibliogr. p. 195-208.
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Computers and productivity : how firms make a general purpose technology work /Hempell, Thomas. January 1900 (has links)
Dissertation--Mannheim--Zemtrum für Europaïsche Wirtschaftsforschung, 2005. / Bibliogr. p. 183-194.
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Het elektrische huis : vormgeving en acceptatie van electrische huishoudelijke apparaten in Nederlanden /Rijk, Timo de, January 1900 (has links)
Proefschrift--Delft--Technische universiteit, 1998. / Bibliogr. p. 393-404. Résumé en anglais.
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L'innovateur, le client et les droits de propriété comment gérer le risque de spoliation ? /Simon, Éric Koenig, Gérard. January 2006 (has links) (PDF)
Thèse de doctorat : Sciences de gestion : Paris 12 : 2006. / Titre provenant de l'écran-titre.
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Qualité d'utilisation des ressources dans l'émergence technologique recherche-expérimentation, diagnostic et propositions de solutions /Amoroso Lima, Marcelo. Savall, Henri. January 1991 (has links)
Thèse de doctorat : Sciences de gestion : Lyon 2 : 1991. / Titre provenant de l'écran-titre.
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