Catálogo de publicaciones - libros

In order to perform effective synchronous online classes with multimedia educational materials, we have developed interactive instruction system named IMPRESSION, which facilitates interactive presentation of various multimedia materials provided by web server on the Internet. In this paper, we clarify the design concept of our system, and show the design and implementation of it. And we discuss the effectiveness of our system through the practical use in the online class for high school students with high-bandwidth networks.

Bookmarking is a popular way to manage retrieval results when searching through web documents, and sharing bookmarks among users can increase information retrieval efficiency. However, a crude sharing style that makes no distinction between retrieval purposes will hinder effective bookmark sharing and any information retrieval based on it. To prevent this problem, we have developed a support system for bookmark sharing which considers differences in search purposes and user groups. We also provide a method for visualizing the relationships among bookmarks.

In this study, we build a knowledge database that consists of topics planetarium curators have about astronomy and the stars. We suggest that the database should have a structure based on constellations and that mirrors the basic way in which humans perceive the night sky. Furthermore, we developed a web system for astronomy education using Ajax. The web system’s interface is based on the planisphere, which is most basic tool for finding stars.

Our objective is to construct the effective collaborative learning support environment. Students acquire knowledge from their activities in a group. On the contrary, a group activity is composed of learning activities of individual students. So, in our approach two support mechanisms are introduced: the mechanism which assists a group to accomplish a group task by generating hints for deriving answers, and the mechanism which promotes individual students in the group activity by pointing out differences between group’s opinions and student’s opinion privately. In this paper, we focus on learning collaboratively mathematical exercises and implemented these support mechanisms in mathematics by using diagrams effectively. Our experimental results make it clear that our mechanisms could promote the group discussion so as to derive answers and urge students to join into the group discussion positively.

In collaborative learning, learners exchange opinions through communication. When learners study the same type of exercises after the collaborative learning, they recall that communication, find effective utterances, and derive an answer by themselves. Therefore, in an collaborative learning support environment, it is useful for learners to monitor communication history after the learning has been finished. In the collaborative learning of exercises that contain an answer and answering paths, grasping answering path that learners derive during the learning and detecting effective utterances based on their answering paths are important. In our approach, the function to add annotations to utterances during learning is introduced in order to grasp effective utterances that students think during the learning. Then, based on the added annotations, learning situation of other learners and effective utterances for learners are derived.

We are developing a system aiming at supporting learners acquiring the ability of using expressions of Japanese as 2nd language. The system assists the author to develop a collection of expression notes edited and annotated to their locations in structured texts. The authored system assists the learners to retrieve and compare usage of the expressions. Based on the experience of an evaluation experiment, a collection of prototype expression notes and an expression relational map were introduced in order to facilitate authoring and learning by comparison of usage of the same or related expressions. We then describe the subsystem for diagnosing sentence-wise blank-filling composition and its authoring system, constructed using a lexicalized grammar with feedback of giving use cases of the erroneously used expressions. Finally we report on the phonetic assistance with visualized prosody in pitch and pause being synchronized with progression of the spoken moras of the voice of the authentic speaker as well as of the learner using a speech recognition engine.

In this paper, we propose a Web-based system to promote public safety and security that uses grassroots information to prevent and solve crime. The feature of our system is that it gathers and formalizes information related to crime or suspicious activities. The system provides useful information by arranging it with time and geographical attributes. As a result, people can find out about crime and suspicious happenings in their local area. Using this system enables people to share their experience and knowledge before crime actually occurs. This can lead to strategies for self-defense against ever-evolving criminal techniques.

The scheme design of active information system can provide the high capability and flexibility of developing application systems. We propose a framework for the design and realization of the active information system, to realize the active requirements from database or application in a uniform and convenient mechanism. According to the framework of an active information system (AIS), some important techniques are discussed. The definition and processing of the event and rule are described. The execution model and realization strategy are explained. This approach is very effective and practical to develop the active information application system.

The scheduling problem of transport vehicles is one of the important issues in our international society. Such a problem should be solved optimally and instantaneously to keep high profitability and conveniency. However, it is hard to find an optimal solution in such a transport problem because transport requests occur constantly and the optimal solution changes according to the requests. Therefore, the strategy to find a near-optimal solution is a practical way to solve the problem at low calculation cost. In this paper, we focus on the range constraints of the optimization problem. The assignment of requests is optimized by request exchange between transport vehicles in their belonging group (i.e., range constraint) to keep the calculation cost low. The group of transport vehicles should be dynamically changed on the basis of their positions. Hence, we introduce an indexing tree called R-Tree and re-construct the tree in certain intervals to index moving transport vehicles dynamically. In the last of this paper, we report the influence of group size and the update interval on the performance of transport vehicles and then show the effectiveness of our optimization algorithm.

We propose a knowledge-based system for process planning in cold forging. In our study, we had developed FORTEK-L (FORging Technology of process planning using Expert Knowledge for Layout), which is widely applicable to various shapes and types of equipment. In the next step, we have developed a knowledge-based die configuration design system, FORTEK-D (Die configuration design), which can generate suitable die configurations from layouts obtained from FORTEK-L. In the development of FORTEK-D, we have analyzed and reproduced the expert engineer’s thinking process during die configuration design. Moreover, we have formulated the data representation, inference method, and knowledge-base for use with this system. In accordance with the formulation, we have developed a prototype system. We applied FORTEK-D to actual forged products and obtained appropriate results. The knowledge using the basic principle is widely applicable to various shapes and on a variety of equipment. Therefore, the abilities to maintain and operate the system have been improved.