Mihye Kim

Development of a digital textbook standard format based on XML

This paper proposes a standard format for those digital textbooks which are used in Korean elementary and secondary school. This standard format comprises an array of function and XML-based document formats. The format aims to maximize the effectiveness of learning by combining the usual advantages of printed textbooks and the additional functions of digital media such as searching and navigation, audiovisuals, animations, 3D graphics and other state-of-the-art multimedia functions. Another objective is to facilitate the interoperability of digital textbooks among different users and service providers by developing an XML-based document format.

Analysis of the Adoption Status of Cloud Computing by Country

Cloud computing is a major area of interest in information technology (IT), which offers the possibility of green IT implementation by reducing operating costs and carbon emissions. Other advantages of cloud computing include scalability, flexibility, reliability, and high performance. Many countries, such as the USA, UK, Japan, and Germany, have introduced and used cloud computing to their IT infrastructure. However, the adoption of cloud computing in South Korea is still in the early stages compared to such countries. This paper presents an analysis of the current adoption status of cloud computing in the USA, UK, and South Korea to seek some directions for the introduction of cloud computing technologies in Korean government agencies and public institutions.

Embedding algorithms for star, bubble-sort, rotator-faber-moore, and pancake graphs

Star, bubble-sort, pancake, and Rotator-Faber-Moore (RFM) graphs are well-known interconnection networks that have node symmetric, maximum fault tolerance and hierarchical partition properties. These graphs are widely assumed to improve the network cost of a hypercube. This study proposes embedding methods for a star graph and its variations, and provides an analysis of the relevant costs. Results show that a bubble-sort graph can be embedded in a star graph with dilation 3, and in a RFM graph with dilation 2, while a star graph can be embedded in a pancake graph with dilation 4. The results suggest that the embedding method developed for the bubble-sort graph can be simulated in star graphs and RFM graphs in constant time O(1).

Development of a 3D Virtual Studio System for Experiential Learning

This paper proposes a three-dimensional (3D) virtual studio system that supports various types of experiential learning using chroma keying and real-time 3D virtual reality techniques. The objective of the proposed system is to maximize learning, especially self-directed learning, and to promote student motivation by improving several technical problems inherent to previously developed virtual education systems. The main improvements are the system speed, the quality of 3D virtual spaces, and the control technique of the user interface with the addition of a speech recognition function. The proposed system was applied and practically used in English classes at several elementary schools in Korea. The results indicated that the proposed system can provide a learning environment in which students can engage in more efficient self-directed learning by enhancing their engagement in the learning process.

An XML-based digital textbook and its educational effectiveness

Textbooks are undergoing a transformation into digital textbooks, which can offer a diverse range of supplementary digital media functions including sounds, audiovisuals, animations, 3D graphics and other state-of-the-art multimedia features. This paper proposes such an XML-based digital textbook aiming to maximize the learning effectiveness by integrating the advantages of traditional printed textbooks with additional digital media functions. The functions of the digital textbook are defined and an XML document format is established to facilitate more flexible use of and the interoperability of digital textbooks among different users and providers. As an application of these proposals, a digital textbook for sixth-grade mathematics was developed and then tested for two semesters at three elementary schools, to assess the overall effectiveness of the proposed concept. Our results indicate that classroom use of the digital mathematics textbook is comparable to that of a printed textbook, but the digital version offer more diverse learning opportunities and facilitate the improvement of learning achievement.

Embedding algorithms for bubble-sort, macro-star, and transposition graphs

Bubble-sort, macro-star, and transposition graphs are interconnection networks with the advantages of star graphs in terms of improving the network cost of a hypercube. These graphs contain a star graph as their sub-graph, and have node symmetry, maximum fault tolerance, and recursive partition properties. This study proposes embedding methods for these graphs based on graph definitions, and shows that a bubble-sort graph Bn can be embedded in a transposition graph Tn with dilation 1 and expansion 1. In contrast, a macro-star graph MS(2, n) can be embedded in a transposition graph with dilation n, but with an average dilation of 2 or under.

The new Petersen-torus networks

Routing and broadcasting are major parameters determining the performance of interconnection networks. In this paper, we propose a new Petersen-torus network

Development of a 3D Virtual Laboratory with Motion Sensor for Physics Education

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