• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1745
  • 435
  • 330
  • 192
  • 111
  • 79
  • 78
  • 60
  • 54
  • 27
  • 22
  • 22
  • 17
  • 17
  • 15
  • Tagged with
  • 3779
  • 682
  • 403
  • 399
  • 338
  • 319
  • 305
  • 296
  • 292
  • 259
  • 247
  • 242
  • 229
  • 222
  • 187
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Can you trust marketing messages? : Challenging a claim in the domain market?

Andersson, Håkan January 2007 (has links)
Today, millions of purchased domain sites names are sitting unused with no real web designs or concrete purpose coupled with them. Why would not owners engage a web-hosting domain-parking hotel so they can earn money through eyeballs advertising or click revenue while their sites sits unused? Parking hotels claim access to passive domain monetization through advertising programs tailored to generate revenue via automatic web page generations containing tailored advertisement. When visitors access these web sites, revenue is generated for domain owners. This study sought to investigate if parking hotels’ advertising claim, that you can make money through them, carries substance. Hence, is it possible to generate sufficient revenue using a parking hotel’s advertising revenue model to pay for the cost of domain ownership and, if possible, generate excess revenue? The study’s epistemological approach, trying to distinguish the truth about the hotels’ claims, stems from a ontological discussion around web hosting hotels’ advertising vehicle existence and its ability to generates revenue. The study challenged a parking hotel’s claim through an inductive quantitative approach by watching advertising revenue for 59 domain names over 105 days. Quantitative data concluded, through a statistical approach, that there were insufficient advertising income, approximately a nickel, to cover the annual cost of approximately $6 USD. Therefore, the study concluded that the advertising claims were misleading and recommends that sites are not purchased, or renew, for the purpose of making money through web hotels’ advertising models.
92

Design and Analysis of Compact Square-Root-Domain Filters

Cheng, Meng-yang 25 July 2007 (has links)
In this thesis, a second-order low pass square root domain filter (SRD filter) based on operational transconductors amplifiers (OTAs) is presented. The SRD filter consists of two translinear filters and four OTAs. Because the OTA has small voltage swings, which may violate the large signal natural of the SRD filter. We investigate the dynamic range of this compact SRD filter with different quality factor(Q). The circuit has fewer numbers of transistors and operate in low voltage, therefore, it has less power consumption and less chip area. The circuit has been fabricated with 0.35£gm CMOS technology. It operates with a supply voltage 1.5V and the biasing current varies from 10uA to 80uA. Measurement results lts show that Im/I0≥40% when the external capacitance C is 3.5pF¡B7pF and Im/I0≥53% when the external capacitance C is 3pF¡B8.5pF. The cutoff frequency of the filter can be tuned from 1.24MHz to 5.53MHz when the external capacitance C is 3.5pF¡B7pF and the cutoff frequency can be tuned from 900KHz to 4.46MHz when the external capacitance C is 3pF¡B8.5pF. The total harmonic distortion is 0.908% and the power consumption is 506£gW.
93

Vagueness and Domain Restriction

Pagin, Peter January 2011 (has links)
This paper develops an idea of saving ordinary uses of vague predicates from the Sorites by means of domain restriction. A tolerance level for a pred- icate, along a dimension, is a difference with respect to which the predicate is semantically insensitive. A central gap for the predicate+dimension in a domain is a segment of an associated scale, larger than this difference, where no object in the domain has a measure, and such that the extension of the predicate has measures on one side of the gap and the anti-extension on the other. The domain restriction imposes a central gap. / <p>Author count: 1;</p> / Vagueness and Context Factors
94

Time domain characterization of interconnect discontinuities

Jong, Jyh-Ming 18 September 1991 (has links)
The purpose of this study is to develop experimental techniques to characterize typical interconnect discontinuities, including bends, steps, T junctions, vias and pads, which are the most commonly encountered interconnections in high speed digital integrated circuits, hybrid and monolithic microwave circuits and electronic packages. The time domain reflection response of these elements is used to classify the interconnect discontinuities as distributed discontinuity elements or as lumped elements depending upon the reflected waveform. For the cases of general distributed discontinuities including bends, steps and T junctions, the distributed equivalent circuit model is characterized by the time dependent impedance profile which is extracted from the time domain reflection measurements. By using known inverse scattering techniques implemented in terms of a new algorithm based on the transfer scattering matrix method of incremental uniform sections, this nonuniform impedance profile is extracted and is used to construct distributed element circuit models to represent the interconnect discontinuities. A circuit model consisting of lumped/distributed elements, is also developed for the interconnect discontinuities which is intended to combine the accuracy of the distributed model with the simulation efficiency of the lumped models. This hybrid mode reduces computer simulation time when used as a net list for general purpose circuit simulators, such as SPICE. For the case of discontinuities modelled as lumped elements, such as vias and wiring pads, closed form equations based on the transfer scattering matrix solution are derived and used to extract the lumped electrical parameters of these elements from the time domain reflection waveform. All of these lumped, distributed and hybrid models are validated by comparing the time domain simulation results with Time Domain Reflectrometer ( TDR ) measurements. A procedure for extracting the excess inductances and capacitances associated with the general discontinuities from the synthesized nonuniform impedance profile or the distributed model is also presented in this report. These results for excess lumped inductances and capacitances show close agreement with the published results for these structures which are based on the electromagnetic computation of excess currents and charges and frequency domain measurements. Finally, some typical cases demonstrating the effects of interconnect discontinuities in high speed clocking systems are presented and the procedure for reducing the reflections and transmission noise voltage by chamfering the bends and junctions is described. / Graduation date: 1992
95

Convective-Resolving Regional Climate Simulations for the Amazon Basin: Comparison with TRMM Rainfall Data

Kinney, Nichole 1987- 14 March 2013 (has links)
With increasing computational power, simulations of regional climate are now becoming possible on convective-resolving grids, thus eliminating the need for a convective parameterization. In the present study, a series of seasonal calculations using the Weather Research and Forecasting (WRF) model are computed at 4-km grid spacing, which reasonably resolves most convective systems. Simulations are computed for both the DJF and MAM seasons as averaged over 2005-2008, with a model domain covering the majority of the Amazon Basin and the adjacent South American coastline. Precipitation statistics are computed and compared to satellite rainfall retrieval data from the 13-year Tropical Rainfall Measuring Mission (TRMM) record. For comparison, a set of companion simulations with 12-km grid spacing are also computed, using the Kain-Fritsch convective parameterization. As compared to the 12-km runs, the 4-km simulations show significant improvement in the overall mean rain rate, the rain rate probability distributions, and the diurnal evolution and timing of precipitation. Both the 4-km and 12-km cases capture the coastal propagating signal and the interior basin-wide diurnal oscillation; however, the 4-km case shows better timing and evolution statistics. Compared to TRMM, the 4-km case rains too infrequently, but is more likely to produce rain events at high rain rates, thus resulting in a similar overall average rain rate. Overall, the present calculations show significant promise for computing regional rainfall patterns on convective-resolving grids.
96

A study on Single Carrier Frequency Domain Equalizer With Zero-Padding under UWB Channels

Chen, Wen-chi 29 July 2010 (has links)
Single Carrier Frequency Domain Equalization (SC-FDE) utilize Time Division multiple Access with Zero-padding under ultra-wideband¡Ait can improve Inter-Block Interference(IBI) and Multi-Access Interference(MAI) to get good performance¡AThis system even can eliminate multi-access interference. Concept of TDMA can avoid the same time to transmit different user¡¦s data with zero-padding algorithm. This method can efficiency to solve multi-access interference. In this thesis, we will utilize property of two dimension to solve multi-access interference between each others. Zero-padding have good capability the same to Cyclic prefix and can save transmitter power. In this thesis, we will not use CDMA of method because it do not need to much analysis of mathematics, moreover, we can provide low cost and low complexity for system to get low error rate. Finally we to be aimed at improve IBI and MAI to simulation under ultra-wideband, then simulation will show thesis of method is high performance than traditional of method.
97

The ferroelectric-ferroelastic twinning in lead zirconate titanate ceramics

Ciou, Ci-Jin 06 August 2010 (has links)
The composition dependent variation of ferroelectric domain structure in lead zirconate titanate (Pb(Zr0.52Ti0.48)O3) ceramics have been investigated within the morphotropic phase boundary (MPB). Tetragonal phase in sintered samples were identified via X-ray diffractometry (XRD). Representative microstructures of ferroelectric domains were examined using scanning electron microscopy (SEM). £\-boundaries, £_- boundaries, and £k-boundaries were analyzed from the contrast of extreme fringe patterns by transmission electron microscopy (TEM). Twin planes for 90o domains lie in {011) and for 180o domains lie in {100) and {220) were determined by selected area diffraction patterns (SADP). Traditional contrast analysis was adopted for determining displacement vectors (R). 90o domains with R = £`[011] and 180o domains with R = n[001]. Convergent beam electron diffraction (CBED) was performed to identify crystalline phases of different domain configurations. By examined the symmetry along the Z = [100], [110], and [111] zone axis, both £_-boundaries and £k-boundaries are tetragonal phase.
98

Implementation of an Accelerated Domain Decomposition Iterative Procedure

Li, Yi-mou 15 July 2002 (has links)
This paper is concerned about an implementation of an accelerated domain decomposition iterative procedure. In [4], Douglas and Huang had shown the convergence for one dimensional partitioning case. This time we make an implementation to show the numerical results, and further more extend our procedure to two dimensional partitioning case. Our results show that the parameter sequence do accelerate our iterative procedure. In one dimensional partitioning case, we have the rule to choose the parameter sequence[4], but in two dimensional partitioning case, we still have no idea about the rule, but we still try to find some parameters to make our procedure more e cient. After some tests, we find that the sequence {0.4, 0.43, 0.45, 0.47, 0.5} works. Though the iteration steps in two dimensional partitioning are not decreasing, our results show the computation time is almost the same as which in the two dimensional partitioning case. It means that the parallelized program could cut down the computation cost.
99

The Cross-domain Analysis of PAM¡Xthe Impact of Cross-strait Direct Flights on the Governmental Aspect of Penghu

Li, Shu-Tsung 10 July 2008 (has links)
Three students work in a team in this research. With the impact of cross-strait direct flights on Penghu as the theme, they start their discussions from the sub-themes which include the economy, the society and the government. The team carries out cross-domain analysis in these different fields, using research methods stretching from regional science, management science and policy science, among others. The team applies the different methods to different fields of study. Regardless of the limitation of the locations and the departments, PAM and the output of cross-domain analysis (analysis of the economic fundamentals, time series analysis, horizontal analysis, and gravity model) are used as the input of judgment analysis (Social Judgment Theory, or SJT). The output of regional analysis and judgment analysis are used as the input of policy analysis (Interactive Management, or IM). The above is combined with Penghu¡¦s existing historical information to yield independent, objective, and credible data for cross-domain analysis. Combining resources including the people, the time, the place and the event, the method encompasses different levels and the participants¡¦ cognitive psychology so that the various powers can come together before they are optimized; a consensus is reached and the maximum value shared by the public is created. This study can be very close related to the livelihood of the citizenry of Penghu. The Interactive Management, or IM, of the policy analysis is applied, combined with Nominal Group Technique, or NGT, and Interpretive Structural Modeling, or ISM, as the methods of analysis. Approximately 26 representatives from various fields are invited to participate. The NGT procedure, from the identification, clarification to voting on the issues, to the comparison among different issues are all assisted with the ISM software to generate an enhanced structural diagram that is more clearly structured and easy to read. After the participants¡¦ deliberation and revision, twelve strategies regarding ¡§the Impact of Cross-strait Direct Flights on Penghu¡Xfrom an Economic Point of View¡¨ were proposed. To clarify the enhanced connections among policies, to bring about an enhanced structural relationship, and to set forth the priorities, goals and directions for each policy, the participants believe that the first task is to establish an effective and integrated platform between the central and local governments, which will help the planning and enforcement of cross-strait policies, as well as improve other policies. Considering the above, government agencies should always bear in mind what the public wants. They should take the public¡¦s needs into consideration and care for the people to widely promote dialogue platforms as public forum so as to realize a ¡§bottom up¡¨ approach and to listen to the opinions from the root of the society. Efforts should be made by all parties to respond to the need of globalization. The public should pay attention to and examine public affairs in both the private and the public arenas. We should have our eyes on the whole and deal with the details. Public opinions should be fully developed, the society should be given more wealth, and the social conditions should be cultivated so that the civil spirits can take root, the power of the civil society can emerge, and a civil-governed democracy can be realized.
100

The Cross-domain Analyses of PAM¡Xthe Impact of Cross-strait Direct Flights on the Societal Aspect of Penghu

Liu, Chao-Ling 14 July 2008 (has links)
Three students work in a team in this study. With the impact of cross-strait direct flights on Penghu as the theme, they start their discussions from the sub-themes which include the economy, the society and the government. The team applies other theoretical frameworks in earnest exploration of Penghu¡¦s potentials to underline Penghu¡¦s readiness for its future. The team applies different method to different fields of study. Regardless of the limitation of the locations and the departments, PAM and the output of cross-domain analysis (analysis of the economic fundamentals, time series analysis, horizontal analysis, and gravity model) are used as the input of judgment analysis (Social Judgment Theory, or SJT). The output of cross-domain analysis and judgment analysis are used as the input of policy analysis (Interactive Management, or IM). The above is combined with Penghu¡¦s existing historical information to yield independent, objective, and credible data for cross-domain analysis. Combining resources including the people, the time, the place and the event, the method encompasses all levels and the participants¡¦ cognitive psychology so that the various powers can come together before they are optimized; a consensus is reached and the maximum value shared by the public is created. The IM theoretical framework is applied to this study, where the livelihood of the Penghu people and how to improve the living standard of the people are discussed. The public forum acts as the platform for dialogue. Twenty-four representatives from various fields were invited to express their ideas in a sensible discussion, where they take in others¡¦ opinions and learn from one another in a forum that is both theoretical and practical. The Interactive Management, or IM, of the policy analysis is applied, combined with Nominal Group Technique, or NGT, and Interpretive Structural Modeling, or ISM, as the methods of analysis. The NGT procedure, from the identification, clarification to voting on the issues, to the comparison among different issues are all assisted with the ISM software to generate an enhanced structural diagram that is more clearly structured and easy to read. After the participants¡¦ deliberation and revision, twelve strategies regarding ¡§the Impact of Cross-strait Direct Flights on Penghu¡Xfrom an Economic Point of View¡¨ were proposed. To clarify the enhanced connections among policies, to bring about an enhanced structural relationship, and to set forth the priorities, goals and directions for each policy, the participants believe that the first task is to deal with the waste management of the county, to raise the public¡¦s environmental awareness, and to solve water-and-electricity-related issues, which will improve other policies. IV The leaders should always start from the people, listen to the people, speak out for the people and keep the people in mind. Just like Atem Ramsundersingh, a senior official in the Water Department at the World Bank, pointed out: in the development of Taiwan¡¦s sustainable policies, the leaders should listen to the voice from the root of the society by allowing the ¡§bottom up¡¨ approach as an effective method for people to voice their opinions in a deliberative democracy. Considering the above and in the hope of identifying an appropriate alternate solution that is comprehensive, sound and practical as a reference for upcoming researchers, it is suggested that the policymakers, when discussing cross-strait policies, should listen to the opinions of people in Penghu via various channels. Practices should complement the theoretical framework in a research for it to reap greater results, namely, the fostering of civil awareness, the improvement of the levels of a civil society, and the realization of civil governance.

Page generated in 0.0428 seconds