Approved for public release; distribution is unlimited / Measurements of a 1230-km baseline were made during an eight-week period in the fall of 1987 using Trimble 4000SX single-frequency, five channel Global Positioning System (GPS) receivers. Twenty-eight days of carrier phase data were processed using correlated triple differences with fixed satellite orbits, the broadcast ephemerides, a modified Hopfield tropospheric model, and without ionospheric correction to determine the accuracies and precisions of the slope distance and baseline components. The data were processed in ever increasing observing sessions to determine the optimized observation periods required to achieve various orders of geodetic accuracies. The accuracies of the slope distances were better than 1.0 ppm for any observing period. The day-to-day repeatabilities of the slope distance measurements were better than 1.0 ppm (2) sigma after 20 minutes of observations. Accuracies and repeat-abilities (2 sigma) of the baseline components were better than 10.0 ppm after 20 minutes of observations. The correlated triple difference results were on the order of previous GPS surveys that used higher resolution differencing or external timing aids. Discussions include the effect of ephemeris, tropospheric and ionospheric errors, and dilution of precision. Observation periods and mean slope distance errors were reduced when observations started close to and included the infinite peak of the Position Dilution of Precision (PDOP). The smallest variances were associated with observations about the infinite PDOP peak / http://archive.org/details/optimizedobserva00bouc / Lieutenant, United States Navy

Thesis advisor: John E. Ebel / Studies of aftershock sequences in the Central Virginia Seismic Zone (CVSZ) provide critical details of the subsurface geologic structures responsible for past and (possibly) future earthquakes in an intraplate setting. The 23 August 2011 MW 5.8 Mineral, Virginia, earthquake, the largest magnitude event recorded in the CVSZ, caused widespread damage and generated a lengthy and well-recorded aftershock sequence. Over 1600 aftershocks were recorded using a dense network of seismometers in the four months following the mainshock, offering the unique opportunity to study the fault structure responsible for the post-main event seismicity. Previous work has not accurately determined the geometry of the fault structure or the migration of post-mainshock seismicity and association of the 2011 event with a known fault has been unsuccessful. In this study, relative locations of recorded aftershocks were calculated using a version of the double-difference location method outlined in Ebel et al. (2008) to generate an accurate model of the fault structure. The moment tensor inversion technique of Ebel and Bonjer (1990) was used to generate focal mechanisms of dozens of the aftershocks at various locations on the fault structure. Results from the double-difference and moment tensor inversion methods were used to map the structure responsible for the aftershock sequence in high resolution. The calculated fault structure has planes with similar strikes and dips as known faults and geologic structures in the CVSZ. In-depth analysis of this aftershock sequence provides seismologists with the opportunity to better understand the seismic hazards present in poorly understood intraplate seismic zones. / Thesis (MS) — Boston College, 2016. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Earth and Environmental Sciences.

Continued demands for better control of the operating conditions of structures and processes have led to the need for better means of measuring temperature (T), pressure (P), and relative humidity (RH). One way to satisfy this need is to use MEMS technology to develop a sensor that will contain, in a single package, capabilities to simultaneously measure T, P, and RH of its environment. Because of the advantages of MEMS technology, which include small size, low power, very high precision, and low cost, it was selected for use in this thesis. Although MEMS sensors that individually measure T, P, and RH exist, there are no sensors that combine all three measurements in a single package. In this thesis, a piezoresistive pressure sensor and capacitive humidity sensor were developed to operate in the range, of 0 to 2 atm and 0% to 100%, respectively. Finally, a polysilicon resistor temperature sensor, which can work in the range of -50ºC to 150ºC, was analyzed. Multimeasurement capability will make this sensor particularly applicable for point-wise mapping of environmental conditions for advanced process control. In this thesis, the development of sensors for such an integrated device is outlined. Selected results, based on the use of analytical, computational, and experimental solutions (ACES) methodology, particularly suited for the development of MEMS sensors, are presented for the pressure, relative humidity, and temperature sensors.

This investigation examined whether children can code the relative proximity of two objects to a landmark and whether they use verbal or nonverbal strategies to remember a target location. Two- to 2.5-year-olds completed a memory task where they watched an experimenter hide two different toys in two identical containers placed 2 and 12 inches from a landmark. The experimenter either used neutral language (e.g., “here”; Experiment 1) or spatial labels (e.g., “close/far”; Experiment 2) to describe objects’ hiding locations. After hiding, children were carried outside the enclosure to a new viewpoint during a 10-second delay and then looked for a target toy. Experiment 2 also included language measures: parent reports of children’s general and relational vocabularies and performance on a language task, which measured children’s understanding of spatial (close/far) and color (red/blue) terms. We found that children successfully coded relative to proximity to a landmark in the memory task. However, hearing spatial labels during hiding in Experiment 2 did not improve performance relative to Experiment 1, and children’s spatial term comprehension in the language task did not predict memory task performance. We also found that children’s productive relational vocabulary predicted memory task performance; however, children’s color term comprehension in the language task was the strongest overall predictor of memory task performance. Collectively, these results suggest that children initially rely on a nonverbal strategy when coding relative proximity to a landmark in a memory task and that children who are better at forming abstract categories may code relative proximity more successfully.

This dissertation consists of two chapters. The first chapter addresses the role of trade barriers in explaining differences in the relative prices of tradables across countries. The second chapter assesses the quantitative importance of changes in comparative advantage in explaining the changes in the compositions of exports and output in South Korea during its growth miracle. In the first chapter I quantitatively address the role of trade barriers in explaining the cross-country distribution of the price of nontradables relative to tradables. Relative prices of nontradables are higher in rich countries than in poor countries. The standard explanation for this is due to Balassa (1964) and Samuelson (1964), where, in each country, the relative price of nontradables is equal to the inverse of relative productivity, and relative productivity is higher in poor countries. I construct a multi-country model of trade in which countries face asymmetric trade barriers. There are many tradable goods and trade barriers determine the cross-country pattern of specialization across tradable goods. The realized pattern of specialization determines measured productivity in the tradables sector, which determines relative prices. Existing trade barriers account for half of the difference in relative prices between rich and poor countries. In the second chapter, I explore how the evolution of comparative advantage can explain the changes in the compositions of exports and output that occurred in South Korea during its growth miracle. From 1960 to 1995 manufacture's share in both exports and output increased. I embed a dynamic, multi-country model of trade into a three-sector model of structural change where agriculture, manufactures, and services are complementary in both consumption and production. I measure productivity growth, in each sector for each country, using a growth accounting procedure. I feed the productivity growth rates into the model and find that the increase in manufacture's share in exports and output are explained by a shift in comparative advantage. The model also matches other aspects of the compositions: the declines in both agriculture's and service's share in exports, and the decline in agriculture's share in output. Finally, the model tracks the composition of output for other countries.

The purpose of this study is to investigate three pertinent aspects of the relative clause in Korean: the form-function of the relative clause, the processing of the head-final relative clause and the acquisition of relative clauses as a second language. Based on universal typology, this study proposes that the linguistic category of the descriptive verb lies between the attributive adjective and the verb. With this identification, the study claims that the modifying ending -(u)n has the prototypical semantic function of the perfective aspect. The perfective aspect is, however, interpreted differently according to the verb types and this provides a solution to the form-function distinction: when the descriptive verb is suffixed by -(u)n, the attributive adjective expresses a permanent state; with the processive verb the relative clause denotes the completion of action or process. The analysis of the linear ordering of elements in the verb phrase reveals that grammatical morphemes are related in the strict grammatical rules, which progressively build up conceptualisation. Contrary to the views presented in previous studies, this study argues that incremental and left-to-right processing, the relative clause has semantic constraints on the head noun. The overall order of difficulty in the acquisition of relative clauses determined by a completion task, a combination task and a grammaticality judgment 'Oh OP>IO>SU>DO>GE, which does not accord with the Noun Phrase Hierarchy (NPAH). / The study finds that markedness theory and configurational analysis are also unable to explain the order exhibited in this study due to the head-final at characteristics of the relative clause. The processing ease is the main contributing factor for learners successfully performing the tasks by utilizing the mental lexicon, SOV canonical word order, case particles and temporal adverbs in sentence initial position. The study also evaluates the effectiveness of instruction and the merits of pedagogical grammar. Incorporating findings from the present study, some suggestions are made for the development of a pedagogical grammar for the relative clause in Korean.

There has been considerable controversy and debate over recent years about the most appropriate method of measuring poverty. This debate has included, among other issues, the questions of absolute versus relative poverty, the merits of money income as a measure of the standard of living and the associated selection of poverty lines and equivalence scales, and the selection of alternative indices of poverty. A review of the literature indicates that the choice of differing approaches to poverty measurement can lead to differing estimates of poverty. In the face of such results an evaluation of the impact upon poverty estimates of alternative measurement methodology is appropriate. This thesis assesses the impact upon the estimated level of poverty of variations in some of the key poverty measurement parameters. The expenditure data derived from the 1975-76, 1984 and 1993-94 Household Expenditure Surveys have been analysed to assess the sensitivity of poverty estimates, derived from a range of poverty indices, to variations in the generosity of the equivalence scales, the level of the poverty line, and the choice of the indicator of the level of resources used. The sensitivity of each poverty index to variations in these parameters is assessed at both the aggregated level and for the specified household types, while those population subgroups particularly susceptible to poverty are also identified. The poverty distributions derived for each of the survey years are compared to evaluate the impact upon changes in the level of poverty over time of variations in the underlying parameters. The thesis concludes that both poverty estimates at a point in time, and poverty trends over time are sensitive to variations in the equivalence scales, in the level of the poverty line, in the selection of the indicator of the level of resources, and in the choice of poverty index itself. In light of these results, a review of recent Australian poverty research concludes that insufficient attention has been paid to the sensitivity issues associated with the measurement of poverty.

One experiment was adminstered to address three issues central to identifying the processes that underlie our ability to learn through observation. One objective of the study was to identify the movement features (relative or absolute) extracted by an observer when demonstration acts as the training protocol. A second objective was to investigate how the performance level of the model (trial-to-trial variability in strategy selection) providing the demonstrations influences movement feature extraction. Lastly, a goal was to test whether or not visual perspective of the model by the observer (first-person or third-person) interacts with the aforementioned variables. The goal of the task was to trace two circles templates with a 90 degree relative phase offset between the two hands. Video recordings of two models practicing over three days were used to make three videos for the study; an expert performance, discovery performance, and instruction performance video. The discovery video portrayed a decrease in relative phase error and a transition from high trial-to-trial variability in the strategy selection to use of a single strategy. The instruction video also portrayed a decrease in relative phase error, but with no strategy search throughout practice. The expert video showed no strategy search with trial-to-trial variability within 5% of the goal relative phase of 90 across every trial. Observers watched one of the three video recordings from either a first-person or third-person perspective. In a retention test, the expert observers showed the most consistant capability (learning) in performing the goal phase. The instruction observers also showed learning, but to a lesser degree than the expert observers. The discovery group observers showed the least amount of learning of relative phase. The absolute feature of movement amplitude was not extracted by any observer group, results consistent with postulations by Scully and Newell (1985). Observation from the 1P perspective proved optimal in the expert and instruction observation groups, but the 3P perspective allowed for greater learning of of the goal relative phase (90 degree) in the discovery observation group. Hand lead, a relative feature of motion, was extracted by most obsevers, except those who observed the discovery model from the 3P perspective. It's concluded that the trial-to-trial variabiliy in terms of strategy selection interacted with the process of mental rotation, which prevented the extraction of hand lead in those observers that viewed the discovery model.

A version of the classical Lefschetz fixed point formula is proved for the cohomology of the cone of a cochain mapping of elliptic complexes. As a particular case we show a Lefschetz formula for the relative de Rham cohomology.

Diamidines are compounds with antiparasitic properties that target the minor groove of DNA. The mechanism of action of these compounds is unknown, but topological changes to DNA structure are a possibility. In this study, we have developed a polyacrylamide gel based screening method to determine topological effects of diamidines on four target sequences: AAAAA, TTTAA, AAATT, and ATATA. The changes caused are sequence dependent, but generally the effect on AAAAA and AAATT is the same while the effect on TTTAA and ATATA is the same. A few compounds show interesting sequence dependent topological effects in the polyacrylamide screening method that could be caused by the compound forming a dimer. Mass spectrometry is used to determine the stoichiometry of DNA-compound complexes. Once compounds show topological effects in the screening method, a bent fragment of kinetoplast DNA is isolated to determine if the same effects occur with DNA from a parasite.