In this book, Andrew Harvey sets out to provide a unified and comprehensive theory of structural time series models. Unlike the traditional ARIMA models, structural time series models consist explicitly of unobserved components, such as trends and seasonals, which have a direct interpretation. As a result the model selection methodology associated with structural models is much closer to econometric methodology. The link with econometrics is made even closer by the natural way in which the models can be extended to include explanatory variables and to cope with multivariate time series. From the technical point of view, state space models and the Kalman filter play a key role in the statistical treatment of structural time series models. The book includes a detailed treatment of the Kalman filter. This technique was originally developed in control engineering, but is becoming increasingly important in fields such as economics and operations research. This book is concerned primarily with modelling economic and social time series, and with addressing the special problems which the treatment of such series poses. The properties of the models and the methodological techniques used to select them are illustrated with various applications. These range from the modellling of trends and cycles in US macroeconomic time series to to an evaluation of the effects of seat belt legislation in the UK.

Forecasting, Structural Time Series Models and the Kalman Filter

หนงสอเรอง การออกแบบการวจย: วธการวจยเชงคณภาพ วธการวจยเชงปรมาณ และวธการวจยแบบผสม (Research Design: Qualitative, Quantitative, and Mixed Method Approaches) เปนหนงสอทเรยบเรยงเพออธบายเกยวกบความแตกตางของกระบวนทศนการวจยทง 2 แบบ ไดแก การวจย เชงปรมาณ และการวจยเชงคณภาพ และความจำเปนของประเดนปญหาการวจยทตองนำกระบวนทศนทง 2 มารวมกนหาขอคนพบเพอนำไปสผลการวจยทสามารถนำผลการวจยไปใชประโยชนไดอยางจรงมากยงขน เรยกวา “การวจยแบบผสมผสาน” ซงเปนหนงสอทอธบายวธการวจยทง 2 ประเภทไดอยางชดเจน และการรวมกนของกระบวนทศนการวจยทง 2 แบบอยางลงตว

Research Design: Qualitative, Quantitative, and Mixed Method Approaches

Organizational learning II: Theory, method and practice

Knowledge Management

After years of research on ontology matching, it is reasonable to consider several questions: is the field of ontology matching still making progress? Is this progress significant enough to pursue further research? If so, what are the particularly promising directions? To answer these questions, we review the state of the art of ontology matching and analyze the results of recent ontology matching evaluations. These results show a measurable improvement in the field, the speed of which is albeit slowing down. We conjecture that significant improvements can be obtained only by addressing important challenges for ontology matching. We present such challenges with insights on how to approach them, thereby aiming to direct research into the most promising tracks and to facilitate the progress of the field.

/pdf/ontology-matching-state-of-the-art-and-future-challenges-486jer3je8.pdf

Ontology Matching: State of the Art and Future Challenges

Ontology engineering processes in truly distributed settings like the Semantic Web or global peer-to-peer systems may not be adequately supported by conventional, centralized ontology engineering methodologies. In this paper, we present our work towards the DILIGENT methodology, which is intended to support domain experts in a distributed setting to engineer and evolve ontologies with the help of a fine-grained methodological approach based on Rhetorical Structure Theory, viz. the DILIGENT model of ontology engineering by argumentation.

/pdf/diligent-towards-a-fine-grained-methodology-for-distributed-2hgvyk2h5v.pdf

DILIGENT: towards a fine-grained methodology for distributed, loosely-controlled and evolving Engineering of ontologies

A prerequisite to the success of the Semantic Web are shared ontologies which enable the seamless exchange of information between different parties. Engineering a shared ontology is a social process. Since its participants have slightly different views on the world, a harmonization effort requires discussing the resulting ontology. During the discussion, participants exchange arguments which may support or object to certain ontology engineering decisions. Experience from software engineering shows that tracking exchanged arguments can help users at a later stage to better understand the assumptions underlying the design decisions. Furthermore, as the constructed ontology becomes larger, ontology engineers might argue in a contradictory way without knowing so. In this paper we present an ontology which formalizes the main concepts which are used in an DILIGENT ontology engineering discussion and thus enables tracking arguments and allows for inconsistency detection. We provide an example which is drawn from experiments in an ontology engineering process to construct an ontology for knowledge management in our institute. Having constructed the ontology we also show how automated ontology learning algorithms could be taken as participants in the OE discussion. Hence, we enable the integration of manual, semi-automatic and automatic ontology creation approaches.

/pdf/an-argumentation-ontology-for-distributed-loosely-controlled-49hwu48mnu.pdf

An argumentation ontology for DIstributed, loosely-controlled and evolving engineering processes of oNTologies (DILIGENT)

Knowledge Engineering and Management by the Masses

Existing mature ontology engineering approaches are based on some basic assumptions that are often neglected in practice.

Ontology Engineering and Evolution in a Distributed World Using DILIGENT

An effective solution to the problem of extending a dialogue system to new knowledge domains requires a clear separation between the knowledge and the system: as ontologies are used to conceptualize information, they can be used as a means to improve the separation between the dialogue system and the domain information. This paper presents the development of an ontology for the cooking domain, to be integrated in a dialog system. The ontology comprehends four main modules covering the key concepts of the cooking domain – actions, food, recipes, and utensils – and three auxiliary modules – units and measures, equivalencies and plate types.

http://www.inesc-id.pt/pt/indicadores/Ficheiros/3240.pdf

H. Sofia Pinto

Papers

DILIGENT: towards a fine-grained methodology for distributed, loosely-controlled and evolving Engineering of ontologies

An argumentation ontology for DIstributed, loosely-controlled and evolving engineering processes of oNTologies (DILIGENT)

Knowledge Engineering and Management by the Masses

Ontology Engineering and Evolution in a Distributed World Using DILIGENT

Cooking an ontology