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Analysis and design of oversampled digital-to-analog convertersXu, Xiaofeng 12 March 1992 (has links)
Oversampled data converters are becoming increasingly popular
for high-precision data conversion. There have been many
publications on oversampled analog-to-digital (A/D) converters but
relatively few on oversampled digital-to-analog (D/A) converters.
In this thesis, issues concerning the analysis and design of the
oversampled D/A converters are addressed. Simulation tools and
analytical methods are discussed. A novel dual-quantization
technique for achieving high-precision D/A conversion is
proposed. A design example is presented to demonstrate that in
many aspects the proposed technique is superior to existing
techniques.
The thesis is divided into four chapters. Chapter 1 is an
introduction to the general concepts of Nyquist-rate and
oversampled data converters. Chapter 2 describes some building
blocks to be used in oversampled D/A converters and gives both
theoretical and simulation methods for analzying them. Chapter 3
describes the proposed dual-quantization D/A converters,
including the structure, the associated design issues and an
example to verify the validity of this technique. Finally, Chapter 4
summarizes the properties of the simulated system and proposes
some future research work. / Graduation date: 1992
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A subranging analog to digital converter using four bit pipeplinePress, Stephen E. 26 January 1993 (has links)
This thesis presents the design of a 10 bit Analog to
Digital Converter which consists of a 6 bit flash followed
by a 4 bit pipeline architecture. The total system is
described and the 4 bit pipeline is implemented on a bipolar
process.
The objective of this research is to provide an
alternative approach to high speed ADC designs and to
implement a pipeline ADC which samples at greater speeds
than those achieved with presently existing CMOS pipeline
designs.
This paper presents the complete architecture, the cell
design and simulated performance for each block in the
pipeline, and the measured results for the four bit pipeline
implementation. / Graduation date: 1993
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Intergenerational transmission of relationship functioning during the transition to parenthoodCarhart, Kathryn 15 May 2009 (has links)
The current study examined whether pre-birth risk factors mediate the relation
between family of origin risk factors and couples’ relationship functioning after birth.
Participants in the present study were 132 heterosexual couples who had their first child
during the course of a larger, longitudinal study (Laurenceau et al., 2004).
Results showed several significant mediation effects for both mothers and
fathers. Additionally, for fathers, family-of-origin factors did not appear to directly
influence their transition to parenthood, but were related to functioning before birth. For
mothers, family-of-origin risk factors appeared to both directly and indirectly influence
their relationship functioning after the birth of a child.
Information on how pre-birth functioning risk factors mediate family of origin
risk factors to the transition to parenthood is useful to psychologists who wish to
intervene and assist at risk couples through the transition. This study contributes to the
literature by illustrating a more complete picture of which individuals may be at risk
during the transition to parenthood, which will allow psychologists to tailor their
interventions to those it will help most.
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A Low-Power Low-Cost 256MHzS/s 6-bit Analog to Digital Converter Using Selective Reference VoltageShieh, Chung-Hsiao 05 July 2005 (has links)
In this paper, we present a low-power low-cost 6-bits, ADC using selective reference voltage technique. Using selective reference voltage technique, the different bit uses different comparator can be achieved. Meanwhile, the outputs from comparators are a binary code which can be used for generating logic condition thereby controlling the switches. Because the conventional n bits flash ADC requires 2n - 1 comparators and its power, area and input capacitance are all proportional to 2n - 1. Whereas, the proposed n bits ADC needs only n comparators which can save more power and area, and its input capacitance are proportional to n only, and keep high speed.
Our proposed ADC is design by TSMC 1P6M 0.18£gm process with 6-bits resolution, 1.8V power supply. The signal input range 0.5V~1.1V, sampling rate 256MS/s, DNL +0.46LSB~ -0.49LSB, INL +0.85LSB~ -0.05LSB. In addition, the FOM of the ADC is only 0.26 pJ/Conv and the power consumption is only 4.2mW.It is good for a low-power and low cost customer electronic application.
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The Relationship of Insider Trading With Stock Price in TaiwnYen, Kuei 25 June 2006 (has links)
In this paper, we investigate the information content of the insider trading. We use book to market ratio to judge the stock price of the firms which tend to be overvalued or undervalued. We suppose that the higher the book to market ratio is, the more the insider buy; vice versa. According to the past papers, seasoning equity offering often happens when the stock price is overvalued. On the other hand, the stock repurchase often happens when the stock price is undervalued. As a result, we propose that if the seasoning equity offering happens, the insiders will sell more holding stocks. If the stock repurchase happens, the insiders will buy more holding stocks. Besides, we try to understand if we can use the insider trading and the book to market ratio to be the signal of seasoning equity offerings or stock repurchase. These empirical results are not the same as our hypotheses because of the specific reason¡Xmost of the corporations in the sample are operated by family. Therefore, they won¡¦t sell their stocks easily. We have to understand the real trading motivation in the subsequences study.
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The Art of Esthetic Narration in the Sequel of Pilgrimage to the WestLin, Jiing-Long 06 July 2000 (has links)
none
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A New Timeout Algorithm for Point-to-Multipoint ABR ServiceChen, Chien-Ting 21 July 2000 (has links)
The ABR point-to-multipoint connection is now playing a more important role. Many consolidation algorithms have been proposed to solve the consolidation noise problems and the slow transient response problem. But few timeout algorithms are proposed to handle the ¡§non-responsive¡¨ branches problems for the multicast connections. We proposed a timeout algorithm which can handle the ¡§non-responsive¡¨ branches problems and with a lower implementation complexity. Simulation results also show that the proposed timeout algorithm can efficiently handle the ¡§non-responsive¡¨ branches and can use the available bandwidth within a small period of time.
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Factors influencing the willingness to pay for agricultural information delivery technologies by cooperative-oriented agribusinesses in Rwanda: evidence from the Abahuzamugambi Coffee Growers Cooperative of Maraba.Haba, Sharon 29 August 2005 (has links)
This study was designed to identify the factors influencing the willingness to pay for agricultural information delivery technologies among the farmers in the Abahuzamugambi Coffee Growers Cooperative located in Butare, Rwanda. Three hundred and six farmers responded to a questionnaire that included questions about their demographic characteristics and accessibility to agricultural information technologies. Results were computed using the mean and standard deviation. T-tests and analysis of variance were conducted to determine the relationship between farmers?? demographic characteristics and their willingness to pay for selected agricultural information delivery technologies. Findings indicate that there was a correlation between farmers?? willingness to pay for agricultural information delivery technologies and some of their demographic characteristics. The farmer-to-farmer delivery technology was the most preferred as reflected by the amount of money that farmers were willing to pay for it compared to expert visits, print, radio, and television. Therefore, this technology was considered to be the most compatible with farmers?? needs in general.
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Transportation barriers to health care: assessing the Texas Medicaid programBorders, Stephen Boyce 17 September 2007 (has links)
Transportation is frequently cited as a barrier to health care, but rarely have
researchers analyzed the problems in depth. The purpose of this study was to assess the role
transportation plays in the utilization of preventive health care services among Medicaid
recipients ages 0 - 20 in Texas. This preventive care is known as Early Periodic Screening
and Diagnostic Testing (EPSDT), a comprehensive prevention and treatment program for
Medicaid eligible children.
Our computer assisted telephone interviewing based survey was administered to
Medicaid recipients selected from a representative sample through a stratified sampling
scheme. Binary logistic regression models were used to assess and predict factors associated
with utilization of the Texas Medicaid Transportation Program (MTP) and utilization of
EPSDT. We also used k-means cluster analysis to identify subgroups of Medicaid clients with
particularly acute transportation barriers.
Of the 1,214 Medicaid recipients interviewed, the overall odds of a Medicaid recipient
being a MTP non-user was 0.94. For clients with automobile access, the probability increases
to 0.98. Clients who experienced difficulties paying for gasoline decreased the overall odds to 0.86. When examining utilization of EPSDT, the overall probability of being a low utilizer was
0.59. Two factors, Spanish-speaking patients (0.21) and clients with more than one child at
home (0.54) decreased the overall odds of being a low utilizer, while those with difficulty
paying for gasoline increased the odds of being a low utilizer to 0.63.
Increasing EPSDT utilization among the millions of Texas Medicaid recipients is an
important policy objective. Because the Texas Medicaid population is large and diverse, no
single approach to increasing utilization is likely to address all needs. The group concept
provides a means to understand which Medicaid recipients do not access MTP services and
those with low utilization rates. These groupings can be useful in targeting Medicaid clients
with specific transportation difficulties. Instead of broad informational campaigns, policy
makers should devise targeted strategies to promote the most appropriate types of assistance.
In addition to expanding transportation options, policy makers should also examine the
locations in which care is delivered, considering telemedicine, mobile health and school-based
health clinics as options.
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Program evaluation of child advocacy centers in West VirginiaBaker,Christopher. January 2008 (has links)
Thesis (Honors)--Liberty University Honors Program, 2008. / Includes bibliographical references.
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