05061 Abstracts Collection -- Foundations of Semistructured Data

From 06.02.05 to 11.02.05, the Dagstuhl Seminar 05061 ``Foundations of Semistructured Data\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

Dagstuhl News January - December 2005

"Dagstuhl News" is a publication edited especially for the members of the Foundation "Informatikzentrum Schloss Dagstuhl" to thank them for their support. The News give a summary of the scientific work being done in Dagstuhl. Each Dagstuhl Seminar is presented by a small abstract describing the contents and scientific highlights of the seminar as well as the perspectives or challenges of the research topic

Marital Quality and Marital Satisfaction in Protestant Haitian Americans vs. Non-Christian Haitian Americans

The current study examined perceptions regarding marital satisfaction as described by Protestants Haitians Americans and non-Christian Haitian Americans. Participants were selected from married Christian and non-Christian couples that have been married for over five years within the age range of 25-53. The study used the Religion-Adapted Cognitive Behavioral Therapy theory (R-CBT) framework. R-CBT is a well-known theoretical framework that integrates religious interventions in the therapeutic relationship to educate clients about the triangular relationship between thoughts, feelings, behaviors, and cognitive restructuring (de Abreu Costa & Moreira-Almeida, 2022). Religion-Adapted Cognitive Behavioral Therapy (R-CBT) incorporates cognitive behavioral therapy methods from the perspective of the clients’ organized system of beliefs. It also integrates practices that connect them with the sacred or God (de Abreu Costa & Moreira-Almeida, 2022; Moreira-Almeida & Koenig, 2006). The researcher used a qualitative descriptive research design because this methodology is used to understand how people make meanings of a given phenomenon or situation. Qualitative descriptive qualitative research design does not conform to a particular research process or procedure, making it possible for the researcher to use different methods in collecting and analyzing data (Patton, 2014). The study findings provided insights into factors influencing marital quality and satisfaction. The study findings also presented limitations, implications for stakeholders, and recommendations for future research

Dagstuhl News January - December 2011

"Dagstuhl News" is a publication edited especially for the members of the Foundation "Informatikzentrum Schloss Dagstuhl" to thank them for their support. The News give a summary of the scientific work being done in Dagstuhl. Each Dagstuhl Seminar is presented by a small abstract describing the contents and scientific highlights of the seminar as well as the perspectives or challenges of the research topic

Constrangimentos, nostalgia e as visitas dos norte-americanos à Europa rural

Doutoramento em TurismoAs Américas constituem a mais relevante fonte inter-regional de turistas vindos para a Europa, sendo os EUA de longe o maior mercado de long haul para a Europa. Mas, apesar da relevância deste mercado nas estatísticas, há uma carência de estudos sobre o mesmo. A maioria dos Norte-Americanos que visitam a Europa mantéem-se em áreas urbanas, limitando o potencial efeito do turismo para equilibrar o crescimento económico na Europa, principalmente em áreas rurais que têm vindo cada vez mais a atrair turistas nas últimas décadas, contando sobretudo da EU. Para o turismo ser realmente uma força positiva de desenvolvimento equilibrado na Europa, os pesquisadores do comportamento do consumidor devem tentar entender por que os viajantes Norte-Americanos não arriscam ir para zonas rurais que supostamente têm o capital tradicional e cultural autêntico que sobretudo os turistas nostálgicos procuram. Esta dissertação pretende contribuir para o conhecimento do mercado Norte-Americano que viaja para a Europa. O objectivo deste estudo centra-se na examinação do papel dos constrangimentos, da nostalgia, e da experiência de viagem para as intenções dos turistas Norte-Americanos de revisitar em destinos rurais Europeus. Apesar de existirem referências à nostalgia em pesquisas de turismo, estas centram-se essencialmente em estudos de carácter qualitativo e tem sido dada pouca relevância à construção de ferramentas quantitativas para o estudo da nostalgia a nível do turismo. Neste estudo, é desenvolvida uma escala de nostalgia para o turismo (NOSTOUR). Os resultados mostram que a nostalgia, relacionada com as viagens pode ser concebida e operacionalizada em quatro dimensões: individual, interpessoal, cultural e virtual. A nostalgia, por si só, não tem um efeito mediador nos constrangimentos para viajar a nível da intenção de regressar e visitar destinos rurais na Europa mas com a adição, do determinante experiência de viagem esse efeito existe.Americas are the most important source of inter-regional tourists for Europe and USA remains by far Europe’s largest single long-haul market. But despite the market and its behaviour is still not well understood. But despite these references of the relevance from this market in statistics there is a lack of studies about this subject. Most of the North Americans that visit Europe stay in urban areas which limit the potential effect of tourism to balance the economic growth in the European region, particularly in rural areas. If tourism is to truly be a positive force of equitable and balance development in Europe, then consumer behaviour researchers must try to understand why they don’t venture to the rural areas that allegedly have the traditional and authentic cultural capital that the nostalgic tourists want. This dissertation intends to contribute to the knowledge of the understudied North-American market to Europe. The purpose of this study was to examine the role of travel constraints, nostalgia and travel experience in shaping North American tourists’ intentions to revisit rural European destinations. Despite of the references to nostalgia in the tourism research, mainly in qualitative studies, relatively very little attention has been paid to the development of research tools of nostalgia for quantitative research on travel. In this study it is created a scale of nostalgia for tourism (NOSTOUR). Results showed that nostalgia triggered by travel has four dimensions, individual, interpersonal, cultural and virtual. Nostalgia by itself does not mediate the effects of travel constraints on the intention to return to Europe and visit rural places but with the addiction of the determinant experience in travel that effect exists

A model for effective use of human resource information systems in South African State Owned Agencies

The relevance of this thesis is in addressing information systems business leadership HRIS use issues.The thesis explains acceptance and use issues central to Human Resource Information Systems (HRIS) within South African State Owned Agencies (SOAs). Organisations typically deploy HRIS with a view to automate Human Resource (HR) service delivery and administrative functions. Among other values, HRIS produces useful data and information which optimises HR operations and improves decision-making. However, the use of HRIS, notably within SOAs, is poorly understood owing to inadequate literature and contextualised studies. Despite the tremendous amount of investment into such systems, SOAs continuously identify emerging challenges and issues pertinent to HR operations and administration. For instance, despite HRIS automation, job applications and recruitment are still manually processed, which means that the costly implemented HRIS is not effectively used, and is thus underutilised. The burning questions for business leadership remain - why is HRIS not optimally utilised given significant organisational investment on such systems, and the mixed return-on-investments? The other question relates to what the level of acceptance is and actual use of these HR systems. There is also a need to determine to what extent do these systems enable or improve the delivery of human resource services and administration. Moreover, what influences the use of HRIS? Previous literature and organisational practice inadequately addresses these questions. This thesis, therefore, addresses these key issues to bridge these preceding knowledge gaps. In order to explain the use and subsequent effective use of HRIS, the study triangulated three theories as theoretical lenses. These theories are the Unified Theory of Acceptance and Use of Technology (UTAUT), Self Determination Theory (SDT), and the Representation Theory (RT). These theories are employed to explore and explain the individual use, and subsequent effective use of HRIS. In this respect, the ontological stance for this thesis is that reality is objective. Thus, the study followed a positivist research paradigm, whilst the research the approach was deductive. A survey research strategy was employed during the study to obtain primary data. Survey participants included executives and individuals from speciality units e.g. HR, Finance, Supply Chain, Support departments (including IT and Help Desks) as well as other HRIS users. Participants were drawn from various South African SOAs. Structural equation modelling and hypothesis testing show that there are myriad of determinants influencing use and effective use of HRIS. The results further show that certain constructs are inconsistent with the existing literature. Nevertheless, this inconsistency speaks to the unique South African SOA contexts. The outcome of the study is a model which theoretically and practically explains those factors which must be considered to effectively use and utilise HRIS. That is, the theoretical, practical, methodological, and contextual contributions of the thesis is in explaining the determinants which are significant for effective use of HRIS.Centre for Business ManangementD.B.L

Aeronautical engineering: A continuing bibliography with indexes (supplement 291)

This bibliography lists 757 reports, articles, and other documents introduced into the NASA scientific and technical information system in May. 1993. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment, and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

A systems biology understanding of protein constraints in the metabolism of budding yeasts

Fermentation technologies, such as bread making and production of alcoholic beverages, have been crucial for development of humanity throughout history. Saccharomyces cerevisiae provides a natural platform for this, due to its capability to transform sugars into ethanol. This, and other yeasts, are now used for production of pharmaceuticals, including insulin and artemisinic acid, flavors, fragrances, nutraceuticals, and fuel precursors. In this thesis, different systems biology methods were developed to study interactions between metabolism, enzymatic capabilities, and regulation of gene expression in budding yeasts. In paper I, a study of three different yeast species (S. cerevisiae, Yarrowia lipolytica and Kluyveromyces marxianus), exposed to multiple conditions, was carried out to understand their adaptation to environmental stress. Paper II revises the use of genome-scale metabolic models (GEMs) for the study and directed engineering of diverse yeast species. Additionally, 45 GEMs for different yeasts were collected, analyzed, and tested. In paper III, GECKO 2.0, a toolbox for integration of enzymatic constraints and proteomics data into GEMs, was developed and used for reconstruction of enzyme-constrained models (ecGEMs) for three yeast species and model organisms. Proteomics data and ecGEMs were used to further characterize the impact of environmental stress over metabolism of budding yeasts. On paper IV, gene engineering targets for increased accumulation of heme in S. cerevisiae cells were predicted with an ecGEM. Predictions were experimentally validated, yielding a 70-fold increase in intracellular heme. The prediction method was systematized and applied to the production of 102 chemicals in S. cerevisiae (Paper V). Results highlighted general principles for systems metabolic engineering and enabled understanding of the role of protein limitations in bio-based chemical production. Paper VI presents a hybrid model integrating an enzyme-constrained metabolic network, coupled to a gene regulatory model of nutrient-sensing mechanisms in S. cerevisiae. This model improves prediction of protein expression patterns while providing a rational connection between metabolism and the use of nutrients from the environment.This thesis demonstrates that integration of multiple systems biology approaches is valuable for understanding the connection of cell physiology at different levels, and provides tools for directed engineering of cells for the benefit of society

The influence of service quality on customer satisfaction, customer value and behavioral intentions in the hotel sector of Ethiopia

The basic purpose of this study was to examine the influence of service quality on customer satisfaction, perceived customer value and behavioral intentions, in three, four and five star hotels in Ethiopia. Additionally, an attempt was made to assess the differences pertaining to these constructs across customer profile (e.g., gender, nationality etc.) and hotel characteristics (e.g., star ratings etc.). A quantitative survey approach was used to obtain primary data from the respondents (hotels’ guests/customers) by administering the structured questionnaire. The original SERVPERF dimensions and related items were modified to best fit with hotel sector, by using desk review and preliminary interviews with manager, consultants and corporate clients of the hotels. A pilot study was carried out with 35 hotel customers to test the initial reliability and validity of the instrument. The final questionnaire was distributed to 440 respondents from 44 hotels (under three, four and five star categories), by using stratified (proportionate) random sampling. Of the distributed questionnaires, 435 were collected back (over 98% return rate), as completely filled, and used for the purpose of analysis. Descriptive statistics (mean score and standard deviation) were used to examine the customers’ perceptions of service quality, customer value, satisfaction and behavioral intentions. To identify the key service quality dimensions in the Ethiopian hotel sector, Principal Component Analysis (PCA) was employed. The results revealed six underlying factors, namely: Assurance, Reliability, Responsiveness, Empathy, Room Tangibles and Food & Beverage Tangibles. Regression analysis was carried out to examine the relationship between the study constructs, whereby perceived service quality was found to be maintaining significantly (p<0.05) positive influence on customer value, satisfaction and behavioral intentions (measured as customer revisits and word-of-mouth recommendations) in the Ethiopian hotel sector. Moreover, both customer value and satisfaction were observed to be partially mediating the influence of service quality on behavioral intentions, with higher contribution from satisfaction than perceived value. Finally, the respondents’ nationality, gender, visit purpose, length of stay, hotel location and star category were found to be determining their perceptions of overall service quality. However, further research is needed before generalizing these relationships to other sectors/contexts.Business ManagementD.B.L

Structural Summaries as a Core Technology for Efficient XML Retrieval

The Extensible Markup Language (XML) is extremely popular as a generic markup language for text documents with an explicit hierarchical structure. The different types of XML data found in today’s document repositories, digital libraries, intranets and on the web range from flat text with little meaningful structure to be queried, over truly semistructured data with a rich and often irregular structure, to rather rigidly structured documents with little text that would also fit a relational database system (RDBS). Not surprisingly, various ways of storing and retrieving XML data have been investigated, including native XML systems, relational engines based on RDBSs, and hybrid combinations thereof. Over the years a number of native XML indexing techniques have emerged, the most important ones being structure indices and labelling schemes. Structure indices represent the document schema (i.e., the hierarchy of nested tags that occur in the documents) in a compact central data structure so that structural query constraints (e.g., path or tree patterns) can be efficiently matched without accessing the documents. Labelling schemes specify ways to assign unique identifiers, or labels, to the document nodes so that specific relations (e.g., parent/child) between individual nodes can be inferred from their labels alone in a decentralized manner, again without accessing the documents themselves. Since both structure indices and labelling schemes provide compact approximate views on the document structure, we collectively refer to them as structural summaries. This work presents new structural summaries that enable highly efficient and scalable XML retrieval in native, relational and hybrid systems. The key contribution of our approach is threefold. (1) We introduce BIRD, a very efficient and expressive labelling scheme for XML, and the CADG, a combined text and structure index, and combine them as two complementary building blocks of the same XML retrieval system. (2) We propose a purely relational variant of BIRD and the CADG, called RCADG, that is extremely fast and scales up to large document collections. (3) We present the RCADG Cache, a hybrid system that enhances the RCADG with incremental query evaluation based on cached results of earlier queries. The RCADG Cache exploits schema information in the RCADG to detect cached query results that can supply some or all matches to a new query with little or no computational and I/O effort. A main-memory cache index ensures that reusable query results are quickly retrieved even in a huge cache. Our work shows that structural summaries significantly improve the efficiency and scalability of XML retrieval systems in several ways. Former relational approaches have largely ignored structural summaries. The RCADG shows that these native indexing techniques are equally effective for XML retrieval in RDBSs. BIRD, unlike some other labelling schemes, achieves high retrieval performance with a fairly modest storage overhead. To the best of our knowledge, the RCADG Cache is the only approach to take advantage of structural summaries for effectively detecting query containment or overlap. Moreover, no other XML cache we know of exploits intermediate results that are produced as a by-product during the evaluation from scratch. These are valuable cache contents that increase the effectiveness of the cache at no extra computational cost. Extensive experiments quantify the practical benefit of all of the proposed techniques, which amounts to a performance gain of several orders of magnitude compared to various other approaches