• The Journal of Korean Association of Computer Education
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• v.11 no.1
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• pp.47-55
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• 2008

The purpose of this study is finding factors affecting the teachers' use of Edunet and exploring the developmental direction of Edunet which is a web based comprehensive educational information service system. Based on the technology acceptance model and the results of the previous studies, five external and three internal factors influencing the use of Edunet were extracted. The participants were 100, the group of field-assistants who were expected core users in Edunet, and the response of questionnaire was gathered by online survey system. To analyze the collected data and the hypothesis, multiple regression was employed. The result indicated that "usefulness" and "trust" affected statically to both (a) the use and (b) the future-intention use of Edunet. "Fitness of instruction" and "ease of use" affected to (c) the usefulness of Edunet. (d) The ease of use of Edunet was affected by "self-efficiency", "contents quality" and "the system-performance" of Edunet.

• The Journal of the Korea Contents Association
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• v.14 no.6
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• pp.307-318
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• 2014

This study investigated how people perceived the importance of health message design principles including gist presentation, usefulness of content, format, and intuitive design and how well a webzine article published by Korean Ministry of Food and Drug Safety was designed in terms of the four design principles. This study also explored what individual characteristics influenced the perceptions of health message design principles. A total of 294 adults participated in the survey, and their responses were analyzed with the Importance-Performance Analysis method. Participants perceived that usefulness of content was most important in the text design; gist presentation was most important in the visual design; and format was well designed in both text and visual messages. This study showed that it is crucial to improve the quality of visual health messages particularly in terms of gist presentation and intuitive design. We also found that individuals' interest in health played a significant role in the perceptions of health messages. These results were discussed in regards to principles and strategies for the effective design of health messages.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.16-24
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• 2007

모바일 폰은 최근 관심의 대상이 되고 있는 사용자 제작 컨텐츠 (User-Created Content: UCC)의 생산과 공유를 위한 중요한 수단이다. 또한 HSDPA나 4G와 같은 차세대 이동통신 기술은Flickr나 YouTube 등의 웹 사이트에서 제공되고 있는 UCC 서비스가 모바일 폰을 통해서도 더욱 활발히 이용될 수 있는 가능성을 제시하고 있다. 그러나 모바일 폰이 가지고 있는 작은 화면 크기와 불편한 입력 장치라는 기본적인 한계는 모바일 UCC 서비스의 성공에 큰 장애 요인으로 작용할 수 있다. 따라서 본 연구는 정보 구조 (Information Structure) 및 정보 시각화 (Information Visualization)와 관련된 기존 이론 및 연구들을 기반으로 4가지 다른 모바일 폰 인터페이스들을 개발하고, 사용자들의 모바일 폰을 통한 탐색적 UCC 서비스 사용을 지원하는데 어떠한 인터페이스가 더 적합한지 실험 방법론을 통해 검증하는 것을 기본 목적으로 한다. 본 연구를 위하여 개발된 인터페이스들은 컨텐츠 구조의 관점에서 폴더 기반 계층 구조 (Folder-Based Hierarchical Structure)이나 태그 기반 네트워크 구조 (Tag-Based Network Structure)를 가지고 있으며, 컨텐츠 시각화의 관점에서는 고정 버튼 (Fixed Buttons)이나 멀티 디스플레이 버튼 (Multi-Display Buttons)를 가지고 있다. 66명의 실험 참가자들을 대상으로 한 실험 결과, 사용자들은 탐험 지향적 탐색 과업 (Exploratory Browsing)에서 태그 기반 네트워크 구조 또는 멀티 디스플레이 버튼이 제공된 모바일 인터페이스에 대하여 상대적으로 더 높은 유용성, 즐거움, 만족도, 향후 사용의도 등을 나타내었다.

• The KIPS Transactions:PartC
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• v.11C no.5
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• pp.703-710
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• 2004

WebDAV is a protocol to support collaboration among one or more groups in geographically distant locations through the internet. WebDAV extends the web communication protocol HTTP/1.1 to provide a standard infrastructure for .supporting asynchronous collaboration for various contents across the internet. A WebDAV client uses HTTP requests to perform a renewal and update action to the resources in WebDAY servers. So, it is desirable that the client supports the ability of authoring and version management with a good concurrency control and property management. In this paper, to enhance usability, we developed a .NET-based WebDAV client with a user interface similar to the Windows Explorer. The developed WebDAV client supports easy launching of the authoring application and appropriate lock control for the server resources. In addition, through the functionality of process monitoring, it supports automatic update of the server resources when the modification of the resources are completed by the user. The WebDAY client is a .NET-based application written in the C＃ language, running on any platform supporting a .NET framework.

• Spatial Information Research
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• v.19 no.3
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• pp.43-52
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• 2011

Recently, interest in location-based service (LBS) which utilizes a DBMS in mobile system environment has been increasing, and it is expected to overcome the existing file-based system's limitation in advanced in-vehicle system by utilizing DBMS's advantages such as efficient storage, transaction management, modelling and spatial queries etc. In particular, the road network data corresponds to the most essential domain in a route planning system, which needs efficient management and maintenance. Accordingly, this study aims to develop an efficient graph-based geodata model for topological network data and to support dynamic path computation algorithm based on heuristic approach in mobile LBS system. To achieve this goal, we design a data model for supporting the hierarchy of network, and implement a path planning system to evaluate its performance in mobile LBS system. Last but not least, we find out that the designed path computation algorithm with hierarchical graph model reduced the number of nodes used for finding and improved the efficiency of memory.

• The Journal of the Korea Contents Association
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• v.14 no.10
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• pp.438-453
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• 2014

This paper proposes a system to translate an RDB into an OWL ontology which enables the users to navigate the ontology in GUI. In order to accomplish the goals mentioned previously, the system overcame two difficulties. First, our system defines a new mapping algorithm to map between DB elements and ontology ones. Comparing with existing solutions, our algorithm is able to generate ontologies from more DB structures. Second, our system provides the same data generated by a reasoner to the users. Note that this operation does not load ABox ontology on a reasoner. In addition, Tableau-based reasoners have the tractability problem on a large ABox (e.g., large ABoxes translated from DBs practically cannot be served). To solve this, our system internally runs SQL queries to retrieve the same data as the one from a reasoner every time ABox elements are queried.

• Information Systems Review
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• v.9 no.1
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• pp.1-21
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• 2007

This research investigates the determinants of consumer's acceptance for the mobile Ads. Based on TAM(Technology Acceptance Model) and Flow theory, our research adopts some factors for a theoretical model such as entertainment, information, irritation, credibility, flow experience, attitudes and acceptance intention. For examining an implied relationships by this research model, a field study using survey methodology for data collection was conducted. This data was analyzed based on using AMOS, the structural equation modeling and a second generation multi variant technique, and has gained distinct advantages over other technique. After some model modification according to model generating strategy approach, this study shows that entertainment, irritation, credibility and flow experience have significant effects on the attitudes. And also, this attitudes have acceptance intention in mobile Ads. In conclusion, implications are discussed along with limitations and further research direction.

• Spatial Information Research
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• v.18 no.2
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• pp.13-24
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• 2010

The purpose of this research is to explore the possibility of geographic education by implementing the map-based geographic education site which mashed up with Google earth by referring the various materials of geographic education which exist in on-line and off-line. In recent years map-based geographic education is required by the radical change of geoweb environments, but there have been few researches in this field. This research is folded up as follows: First, we designed the contents through the textbook analysis and then collect various data related to the contents such as pictures, video clips, conceptual map, etc. which are required to explain the concept. Second, we mashed up the collected data on the Google earth by using the Google's open API. Third, we implemented the geographic education website based on the classification of contents in textbook and the various collected data. This research is important in both that it explores the possibility of the map-based education rather than the text-based education in the geographic field which handles mainly the space and finds the best method to express the various concepts of the textbook on the geoweb environments.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.1-16
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• 2005

When Web-based special retrieval systems for scientific field extremely restrict the expression of user's information request, the process of the information content analysis and that of the information acquisition become inconsistent. Accordingly, this study suggests the re-ranking retrieval model which reflects the content based similarity between user's inquiry terms and index words by grasping the document knowledge structure. In order to accomplish this, the former constructs a thesaurus and similarity relation matrix to provide the subject analysis mechanism and the latter propose the algorithm which establishes a search model such as query expansion in order to analyze the user's demands. Therefore, the algorithm that this study suggests as retrieval utilizing the information structure of a retrieval system can be content-based retrieval mechanism to establish a 2-step search model for the preservation of recall and improvement of accuracy which was a weak point of the previous fuzzy retrieval model.

• The KIPS Transactions:PartC
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• v.13C no.4 s.107
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• pp.511-520
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• 2006

WebDAV is a protocol which supports web-based distributed authoring and versioning, providing a standard infrastructure for asynchronous collaboration on various contents through the Internet. Current WebDAV-enabled authoring applications that support WebDAV, such as Microsoft office, Photoshop, or Dreamweaver, work by integrating WebDAV capabilities into the application. While this approach provides solid support for collaborative authoring, it has a drawback that each of the applications needs to support WebDAV capabilities in its own way. We developed a WebDAV client named DAView running on Linux KDE, which enables WebDAV-unaware authoring tools to have effective remote authoring capabilities. DAView provides a GUI view of a WebDAV server, similar to existing WebDAV-enabled file managers such as DAVExplorer. Unique among WebDAV file managers, it also provides the ability to launch the authoring application associated to a WebDAV server resource, automatically managing the locks on the resource.