On Implicational Dependency Families Possessing Finite Armstrong Relations

Let X ≠ 0 be a finite collection of nonempty relations over the relation scheme R(A1, A2 , ... , A,.); then the closure of X under embedding and direct product (up to isomorphism) is a finitely generated Implicational Dependency family (ID-family) generated by X. In this paper, we show that the class of finitely generated ID-families is identical to the class of those ID-families which possess a finite Armstrong relation

A domestic model for successful implementation of enterprise resource planning (ERP) systems in Iranian manufacturing enterprises

This research investigates the human-behavioral dimension of technology acceptance in enterprises. It is evident that accepting a technology depends on the underlying circumstances of the environment. We have approached this issue from two different angles of social and technological architecture. The research tries to explore proper enterprise architecture for ERP system acceptance. Social Architecture (SA) is defined as the set of circumstances that makes people behave in a particular way. So behavior of persons (employees of an enterprise) can be a function of SA. Hence acceptance of a system can be dictated by SA and manipulating SA can result in desirable success for a technology system. We have achieved various variables of social architecture and have examined their relevance to system acceptance and success in related enterprises (research domain) beside technological architecture variables. The results have indicated that a special form of social and technological architecture can lead to success for ERP system in the enterprises of the research domain. This gave us a model of architecture

Final report of Task #5: Current document index system for document retrieval investigation

In Part I of this report, we describe the work completed during the last fiscal year (October 1, 2002 thru September 30, 2003). The single biggest challenge this past year has been to develop and deliver a new software technology to classify Homeland Security Sensitive documents with high precision. Not only was a satisfactory system developed, an operational version was delivered to CACI in April 2003. The delivered system is called the Homeland Security Classifier (HSC). In Part II we give an overview of the projects ISRI has completed during the first four years of this cooperative agreement (October 1, 1998 thru September 30, 2002). Each of the deliverables associated with these projects has been thoroughly described in previous reports

On Purely Exponential Logic Queries

The recursive nature of logic programs has long been the subject of optimization techniques [2, 8]. Recently, the database community has taken interest in extending the expressive power of relational algebra by augmenting it with function-free Horn style logic queries. This extension has led to various optimization techniques [2, 6, 8]. It seems, almost invariably, these techniques are most efficient in the processing of linear recursive queries. Moreover, as the equivalence of nonlinear rules to linear rules in general is undecidable [3, 9], the best one can hope is to rewrite some nonlinear rules as linear rules. For this reason, there is a genuine interest in identifying those classes of non-linear recursive queries which can be rewritten as linear queries. Among these classes are binary chained purely exponential queries [5] and doubly recursive queries [11]

Un estudio del corpus de medidas de duración rítmica del dialecto Kalhori del Kurdo

In order to identify between-sentence and between-speaker variabilities, one of the methods used by phoneticians is studying durational rhythmic features. In the present research, to classify speech rhythm of Kalhori, a variety of Kurdish, and to find out about the most appropriate measures for between-sentence and between-speaker rhythmic variability in Kalhori, durational speech rhythmic measures were analyzed. To this end, two speaking styles (read and spontaneous) were explored. The analysis of the read corpus revealed that Kalhori Kurdish rhythm pattern is between stress-timed and syllable-timed. The results indicated that %V (proportion over which speech is vocalic) was the most significant measure for distinguishing between-sentence rhythmic variability in the read corpus, while %V and rateSyl (syllable rate) were the most efficient measures for identifying the between-speaker rhythmic variability in both the read and spontaneous corpus.Uno de los métodos empleados en fonética para identificar la variabilidad entre oraciones y hablantes es el estudio de las características rítmicas. En este estudio, se han analizado algunas métricas temporales de ritmo en kalhori (una variedad del kurdo) para descubrir las que mejor explican la variabilidad rítmica entre oraciones y entre hablantes. Con este fin, se han utilizado dos estilos de habla: lectura y habla espontánea. El análisis del corpus de lectura demostró que el tipo de ritmo del kurdo kalhori se puede situar en el medio del continuo entre lenguas de ritmo acentual y lenguas de ritmo silábico. Los resultados indican que la métrica más adecuada para explicar la variabilidad rítmica entre oraciones en el corpus leído fue %V (proporción de vocales sobre el total de habla), mientras que %V y rateSyl (número de sílabas pronunciadas por minuto) fueron las métricas más eficientes para identificar la variabilidad rítmica entre hablantes, tanto en el corpus leído como en el espontáneo

Comparison of shear bond strength of CAD/CAM and conventional heat-polymerized acrylic resin denture bases to auto-polymerized and heat-polymerized acrylic resins after aging

The aim of this study was to investigate the shear bond strength of CAD/CAM and conventional heat polymerized acrylic resin denture bases bonded to self-cured and heat-cured acrylic resins after aging. Material and Methods: A total of 40 cu

The relationship between attentional bias, anxiety sensitivity and metacognitive beliefs in substance abuser: with an emphasis on mediating effects of emotion regulation strategies

Background: Several studies have shown that Attentional Bias plays a role in the beginning, persistence and relapse of Substance Abuse Disorder. Therefore, identifying the factors related to Attentional Bias in Substance Abusers is important. In so doing, the present study was aimed at examining the relationship between attentional bias, Anxiety Sensitivity and Metacognitive Beliefs in Substance Abusers with an emphasis on mediating effects of Emotion Regulation Strategies.Methods: The present study is fundamental in terms of the objective and descriptive regarding data collection which was conducted within the framework of a correlation study. The statistical universe comprised a group of soldiers in Tehran who were considered as Substance Abusers and had been referred to Addiction Treatment Centers of Baharestan County. Among the statistical universe, 120 participants were selected by non-random purposive sampling. Finally, Anxiety Sensitivity, Metacognitive Beliefs, Emotional Regulation Strategies and the Stroop test questionnaires were conducted on the sample. For sorting, processing and analysis of data and the evaluation of the research hypothesis, we used the SPSS and LISREL. To examine the relationship between variables, the Pearson correlation and path analysis were used.Results: Pearson correlation results indicated that Anxiety Sensitivity, Metacognitive Beliefs, Suppression, and Reappraisal have a significant relationship with the Attentional Bias.The results of the path analysis revealed that the direct effect of Anxiety Sensitivity and Metacognitive Beliefs on the Attentional Bias is not significant, but these structures may have an effect on the Attentional Bias only through the mediator variables (Suppression and Reappraisal).Conclusion: An individual resorts to metacognitive beliefs to get rid of the negative emotions caused by high Anxiety Sensitivitybut these emotions get intensified in this process and the individual in the long term experiences Substance Abuse through avoidance strategies such as Suppression.Therefore, whenthe personexperiences negative emotions, he will have an Attentional Bias toward liberating signs of Substance Abuse inside and outside

Implementing high-technology intelligence at national level organizations: An action research study

Technology intelligence (TI) activities are those activities which support decision-making of technological and general management concerns by timely preparation of relevant information on technological facts and trends by means of collection, analysis and dissemination. Thus, TI is one of the important and critical processes of management of technology that includes technology forecasting, monitoring and assessment concepts.  Implementation of TI activities at national level organizations results in a system for high-technology decision makers which provides them not only a general view of relevant technologies but also the important trends of such technologies so they can make proper decisions for technology acquisitions. No models have not been developed for implementation of high technology intelligence in developing countries based on their different context so far. The main purpose of this research is to develop a model for designing roadmap for implementing high-technology systems at national level organizations in developing countries. The following project process is characterized as an oscillation between information accumulation, discourse, and practical action i.e action research. First based on literature review six dimensions of technology intelligence including management of intelligence processes, goals and Startegies, structures and human resourses, tools, cycles were conceptualized. By a conceptual framework relationships of the main dimensions and their sub dimensions were presented .Structured and semi structured interviews ,expert workshops were performed to design the appropriate roadmap model including different layers ,connection of layers and critical milestones based on the theoretical framework. For evaluation, the model was customized for a national level high technology based organization (action planning) and then implemented .Based on action results the model was corrected and revised .As conclusion a conceptual framework for roadmap designing was recommended