Power measurement is important for various purposes such as revenue metering, power quality improvement, and direct load control. Various algorithms for power measurement have been proposed in the time domain, which implies a simple instrumentation, but more useful power formulations have been derived in the frequency-domain approach which would require appropriate sampling and measurement techniques to avoid long delay in processing voltage and current signals. The aim of this thesis to implement a measurement instrument that can measure the power components digitally and efficiently under sinusoidal and non-sinusoidal situations. We will use a high performance digital signal processing (DSP) chip and adopt a frequency domain based algorithm for the computation of power elements. The measurement system is expected to offer both high speed and accuracy, and can show wide spectra limited only by the sampling frequency.

For foreign spouses faced with cultural differences, low autonomy, and low local language proficiency, the internet provides them with means to breaking insulation. Via the internet, foreign spouses can obtain help and increase autonomy. This research aims to discuss 4 perspectives: (1) foreign spouses¡¦ Chinese proficiency, (2) digital divide, (3) digital inequality, and (4) the processes of their digital empowerment. The research points out that many foreign spouses cannot write Chinese characters well. Neither can they understand Chinese phonetic symbols. Therefore, foreign spouses have difficulty keying in long Chinese paragraphs; they mostly read Chinese articles on the Internet. Besides, foreign spouses sacrifice their time, place, and functions of internet use because they put priority on becoming a ¡§good wife, good mother, and good daughter-in-law.¡¨ Due to that awareness, they sacrifice digital access for their family. Most important of all, the digital divide and inequality leads to digital downward spiral. Because they lack computer and internet equipment, they cannot develop the skills needed to use computer. Because digital inequality, their skills deteriorated so that they think they have no need to buy related equipment. Foreign spouses, however, know that if they can use computer and the internet, their autonomy can be increased so that they do not have to count on their husbands for everything. Besides, the importance of the internet for the foreign spouses also influences the decision whether they buy and use the internet. If they think the internet cannot benefit them in their daily life, they would not purchase the Internet.

Thesis (M.A.)--Kutztown University of Pennsylvania, 2000. / Source: Masters Abstracts International, Volume: 45-06, page: 2707. Typescript. Abstract precedes thesis title page as [2] preliminary leaves. Copy 2 in Main Collection. Includes bibliographical references (leaves 108-115).

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published_or_final_version / Electrical Engineering / Master / Master of Philosophy

The South Asia sub-region is now in the forefront of the Open Access movement within developing countries in the world, with India being the most prominent partner in terms of its successful Open Access and Digital Library initiatives. Institutional and policy frameworks in India also facilitate innovative solutions for increasing international visibility and accessibility of scholarly literature and documentary heritage in this country. This publication has its genesis in the recommendations and proceedings of UNESCO-supported international conferences and workshops including the 4th International Conference of Asian Digital Libraries (ICADL2001, Bangalore); the International Conferences on Digital Libraries (ICDL2004 & ICDL2006, New Delhi); and the International Workshop on Greenstone Digital Library Software (2006, Kozhikode), where many information professionals of this sub-region demonstrated their Digital Library and Open Access initiatives. This book describes successful digital library and open access initiatives in the South Asia sub-region that are available in the forms of open courseware, open access journals, metadata harvesting services, national-level open access repositories and institutional repositories. This book may be considered an authoritative Source-book on Open Access development in this sub-region.

Artificial Intelligence Lab, Department of MIS, University of Arizona / Digital libraries of geo-spatial multimedia content are currently deficient in providing fuzzy, concept-based retrieval mechanisms to users. The main challenge is that indexing and thesaurus creation are extremely laborintensive processes for text documents and especially for images. Recently, 800,000 declassified satellite photographs were made available by the United States Geological Survey. Additionally, millions of satellite and aerial photographs are archived in national and local map libraries. Such enormous collections make human indexing and thesaurus generation methods impossible to utilize. In this article we propose a scalable method to automatically generate visual thesauri of large collections of geo-spatial media using fuzzy, unsupervised machine-learning techniques.

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Serendipity is a popular word that captures a rich phenomenon with potentially far-reaching implications from a personal to global level. Serendipity is associated with revelations, discoveries, life events, and innovations, both big and small, and the lack of consensus on its definition reflects this breadth of meaning. Serendipity is defined in this research as an unexpected experience prompted by an individual’s valuable interaction with ideas, information, objects, or phenomena. While efforts are being made to facilitate serendipity in digital environments (e.g., websites, databases, search engines), we know very little about the complex interaction between the individual and the environment and what actually facilitates serendipity. In three phases, this thesis investigated how individual differences and environmental factors influence work-related serendipity and how serendipity may be facilitated in digital environments. Phase 1 explored serendipity through semi-structured interviews with 12 professionals and scholars. Based on findings from Phase 1, in Phase 2 a serendipitous digital environment scale to measure how well a digital environment supports serendipity was developed, assessed, and honed though an expert review by eight researchers and a web-based survey of 107 university students. Phase 3 employed a web-based survey of 289 professionals and scholars. Through exploratory factor analysis, the serendipitous digital environment scale was refined and assessed. Using multivariate analyses, relationships were explored between serendipity, the underlying factors of the serendipitous digital environment scale, type of digital environment, creative environment perceptions, locus of control, extraversion, and openness to experience. My research found that the type of digital environment influences the frequency of serendipity, which in turn shares a relationship with three factors of the serendipitous digital environment scale – enables connections, trigger-rich, and leads to the unexpected. Furthermore, results indicate that individuals’ level of extraversion influences perceptions of serendipity in general. This research contributes to our knowledge of information seeking and use through findings that confirm and augment previous models of serendipity through the identification of what influences serendipity. This research also underscores the potential to design for serendipity in digital environments and provides a tool for developers to assess the serendipitous nature of their systems.