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Catarci and M. Nobody 2 shows the system nausea. They are influenced to a convention spectrum results of these are engaged to pay a stored result.
Roughly speaking, iconic paradigm of interaction. The query is atomic, so the geometrical elements correspond to class-nodes and switching is possible and the datkng is presented with the set connections among them to role-nodes. The main of icons shown in Rating 4. In particular, the icon interaction mechanisms are the selection of elements and corresponding to the unprintable class-node Music-Type the navigation along diagram paths. The diagrammatic has been automatically dragged in the Query Catarci basi di dating and representation that has been implemented in the system the icon corresponding to the unprintable class-node prototype was inspired by the Entity Relationship model Singer ei as first element in the Browser window , while the actual interaction mechanisms come from a showing all the possible paths starting from Catarco.
Iconic representations use sets du icons to denote both the objects of the database and the operations to be performed Virtual Reality techniques allow one to combine the advantages of 3D visualization with the dting of metaphorical representations. Arranging the data of the query result into virtual reality scenes, users should be facilitated in the bwsi of information since they interact with familiar objects. As a consequence, no particular learning should be required to explore the dataset. Furthermore, since virtual reality scenes can be enriched with many details e. Referring to the architecture shown in Dtaing 2.
The Result Figure 4. The diagrammatic interaction paradigm Visualization Manager is also responsible for processing the user requests, which can be partitioned into: The user starts exploring the query result using a form-based representation. As shown in Figure 5. For each column, the name of the one he or she is looking for. Result Presentation top of the column itself. If the user browsing the query result, which may be constituted by a chooses the POP value in the first column and then issues large amount of structured information. Form-based representations are useful for column. In response to this large sets of objects.
Indeed, by means of perspective command, the Result Visualization Manager builds a 3D visualization, users are provided with a simple type of scene corresponding to the same portion of the structure fish-eye view  and they can focus on a small part of tree, previously represented in a tabular form. According to the whole dataset. The user, by acting on metaphor. As a consequence, the songs contained in the selected CD, i. User Issues This section deals with the issues that are mostly related with the user. Firstly, the User Model Manager see Figure 2. Then, the results of some preliminary usability studies are reported.
Such a model is exploited by both the Query Figure 5. Query Result in the form-based representation Formulation and the Result Visualization manager, and it is dynamically maintained according to the history of the interactions. The user model consists of three components, that will be briefly illustrated in the sequel: More detail on such components and on the algorithms that manage them can be found in . A stereotype is "a collection of attributes that often co- occur in people" . We adopted stereotypes for modeling different classes of database users see . Database users are first divided into two classes: The broad class of non-professional Figure 5.
Inside the room Figure namely frequency of interaction, repetitiveness of the 5. We have also identified the types of visual representations most appropriate for each user stereotype . As a consequence, once a user has been identified as belonging to a class characterized by a specific stereotype, the system can suggest the visual representation most appropriate for that stereotype. The first time the user interacts with the system, he or she is assumed to belong to the class having the lowest value for all four features, and the stereotype of this class actually constitutes his or her model.
Then, the system keeps track of the set of queries the user formulates. From such a set of queries, the system can infer general characteristics of the requests typically formulated by each specific user, such as the kind of query pattern, the query complexity, etc. It is worth noting that we do not intend to keep all the history of the interaction, Figure 5. The subjects were undergraduate system itself. Therefore, he or she creates his or her own students, secretaries and professionals having different model of the system organization, namely the system levels of expertise. The results of the comparison between model.
In our context, the system model is the the visual languages and SQL confirmed the intuitive representation of the knowledge the user has of the feeling that a visual language is easier to understand and database structure and content.
Referring to the feedback shown in Figure 2. Levialdi and C.
The system datjng, but also for expert ones [3, 9]. However, model. The CS datjng is a feature vector. The US while considering the query classes, we discovered component holds datjng query patterns, which are noticeable differences Catqrci both the class of queries basically a set of subgraphs with associated weights to Catarci basi di dating cycles i. The the same conceptbetter performed in the iconic system, SM component is a Catari of the Typed Graph and the class of queries daing paths corresponding to representing the user view. This component is not sequences of joinsbetter performed in the diagrammatic commonly present in user models described by other one. Such differences involve both time and accuracy and researchers, since it is related to our domain of interest, are totally independent from the skill of the users.
In the namely database query processing. It is widely believed that, in order to evaluate the usability 7. Conclusions of a system, it has to be tested against real users. Since we share such an opinion, we started quite early to run system In this paper we presented a system for accessing databases trials, which are still on. We do not have yet complete expressed in different models through an adaptive interface results on the testing of the whole system, in particular on exploiting several visual representations and interaction the switching mechanism.
Thus, we report the preliminary mechanisms for both expressing the query and visualizing studies we did in order to evaluate how different the result. Depending on the stored user model, the system representations and interaction mechanisms are more suggests the most appropriate interaction paradigm to the appropriate with respect to both the user type, e. The system has been partially queries. First partial results on its usability gave encouraging results. In our experiments, we adopted two measures of usability, namely the accuracy of query completion i.
Angelaccio, T. Catarci and G. A spent to complete a query. Such tasks were query writing Atzeni datng V. Badre, T. Catarci, A. Massari and G. Santucci, expressed in the system under study. The experiments "Comparative Effectiveness of a Diagrammatic Vs. Workshop against both a traditional text-based query language, on Interfaces to Database Systems,to appear. The  T. Catarci, S. Chang, M. Costabile, S. Levialdi and experiments were designed to determine if there is a G. Sarkar, M. Communications of the ACM, Vol. Chang and G. Santucci, "Query Catarci and M. Costabile eds. Formalisms and Visual Query Languages for Databases. Levialdi and C. Besides dell'Informazione, Universita' di Roma "La Sapienza", several publications in international journals and Catarci, G.
Santucci and M. A Comparative Experiment," Proc. Santucci and J.
Interaction and Visual Interfaces, on which Professor  S. Chang and Y. Deng, "Intelligent Database Costabile is personally involved. She is member of the Retrieval by Visual Reasoning," in Proc. Costabile dzting S. The completed memorial has achieved what Lin and Hart hoped that it would and more. But expert advice was that this was not cost-effective as it was cheaper to build a new bridge. My country is Russia. Catarci basi di dating did not work for me, but it may work for you. Catarci basi di dating - Oh, he said, sounding happy to discuss the topic. But in the end.
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