• Spatial Information Research
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• v.17 no.3
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• pp.361-370
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• 2009

As the increasing interests of spatial information for different application area such as disaster management, there are many researches and development of indoor spatial data models and real-time evacuation management systems. The application requires to determine and optical paths in emergency situation, to support evacuees and rescuers. The optimal path in this study is defined to guide rescuers, So, the path is from entrance to the disaster site (room), not from rooms to entrances in the building. In this study, we propose a time-dependent optimal routing algorithm to develop real-time evacuation systems. The network data that represents navigable spaces in building is used for routing the optimal path. Associated information about environment (for example, number of evacuees or rescuers, capacity of hallways and rooms, type of rooms and so on) is assigned to nodes and edges in the network. The time-dependent optimal path is defined after concerning environmental information on the positions of evacuees (for avoiding places jammed with evacuees) and rescuer at each time slot. To detect the positions of human beings in a building per time period, we use the results of evacuation simulation system to identify the movement patterns of human beings in the emergency situation. We use the simulation data of five or ten seconds time interval, to determine the optimal route for rescuers.

• Journal of Information Technology Services
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• v.13 no.3
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• pp.235-255
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• 2014

Social Network Service (SNS) with emergence of Web 2.0 have been developed rapidly. Unlike other games, social network game is based on the relationship with smart devices and studied for user-centered behavior as a potential factor derived from the Technical Acceptance Model (TAM). This research is conducted for finding out influencing factors on continuous intention for smart device users. Therefore, the independent variables consist of subjective norm, mobility, playfulness, self-efficacy, and ease of use. The intermediate variables also compose of flow, and user satisfaction and the dependent variables as continuous intention. The result of study shows the following: First, subjective norm, playfulness, self-efficacy and ease of use except mobility have the positive effect on user flow. Second, subjective norm, mobility, playfulness and ease of use except self-efficacy have significantly the positive effect on user satisfaction. Finally, user flow has significantly the positive effect on user satisfaction and continuance intention and a factor of user satisfaction have significantly the positive effect on continuance intention.

• Journal of Fisheries and Marine Sciences Education
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• v.23 no.4
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• pp.549-567
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• 2011

The purpose of this study was to analyze and to compare the use of illustrations of the elementary practical arts textbooks and to make suggestions for an improvement of the use of illustrations in elementary practical arts textbooks. It is expected that the results of this study can be used by textbook developers, publishers, and teachers in their efforts to improve the quality of elementary practical arts textbooks. For the study, 'Units of Raising Animals' in the sixth grade practical arts textbooks in Korea was selected and analyzed according to the three criteria: kinds of illustrations, sizes of illustrations and purposes of illustrations. In this study, the following facts were found. First, 2007 revised practical arts textbooks have about 5.2 illustrations per page whereas 7th practical arts ones have 4.2. Second, even though 2007 revised practical arts textbooks are highly dependent on photographs, kinds of illustrations of 2007 revised practical arts textbooks have more ratio of pictures, cartoons and diagrams than the ones in the 7th practical arts textbooks. Third, sizes of illustrations of the 2007 revised practical arts textbooks are ordered in small, medium, large size illustrations and there was an increase in medium sized illustrations. Lastly, the purpose of the illustrations from the 2007 revised practical arts textbooks are on the decrease the supply of learning materials but there was an increase in the learning motive induction and guidance for experiment.

• Nuclear Engineering and Technology
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• v.54 no.3
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• pp.1098-1108
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• 2022

The effect of the material hardening model of the canister on a finite element vertical cask drop simulation is investigated for the strain-based acceptance evaluation. Three different hardening models are considered in this paper: the isotropic hardening model, the strain rate-dependent Johnson-Cook (J-C) hardening model, and the modified J-C model which are believed to be the most accurate. By comparing the results using the modified J-C model, it is found that the use of the J-C model provides similar or larger stresses and strains depending on the magnitudes of the strain and strain rate. The use of the isotropic hardening model always yields larger stresses and strains. For the strain-based acceptance evaluation, the use of the isotropic hardening model can produce highly conservative assessment results. The use of the J-C model, however, produces satisfactory results.

• Journal of the Korean Society for Library and Information Science
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• v.57 no.2
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• pp.293-319
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• 2023

As libraries strive to improve their services, many have expressed interest in implementing new technologies. One such technology is metaverse, a virtual-reality space that enables social activities using avatars. However, implementing this technology can be challenging when many librarians are unfamiliar with the concept. This study aimed to investigate how librarians' prior experiences with metaverse influence their expectations and potential use of the technology in libraries. Interviews with a total of 18 librarians were conducted. The study findings reveal that librarians had different conceptualizations of metaverse, regardless of prior experience. However, librarians had different thoughts on the potential use of metaverse for libraries dependent on prior experience. Regarding thoughts on potential use, the librarians who had non-experience running metaverse programs suggested ideas in expanding and trying out new services within metaverse. The librarians who had experience running metaverse programs, on the other hand, suggested focusing on transferring the existing services that are currently being provided in the library to metaverse.

• Asia pacific journal of information systems
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• v.33 no.3
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• pp.792-811
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• 2023

Recently, Web 3.0 services such as virtual currency, block chain, and NFT are attracting public attention. Users who depended on platforms are moving away from being dependent on service providers and moving to Web 3.0 services. Representative services of Web 3.0 include P2E (Play to Earn) and M2E (Move to Earn). In the case of P2E, various studies have been conducted as it is widely covered in the press and media, but research on M2E is relatively lacking. This study attempts to identify the intention to use M2E by using the expanded technology acceptance model. External factors were selected based on M2E's own characteristics and personal characteristics, a research model was designed, and the proposed hypotheses were verified through factor analysis and goodness of model fit. As a result of the study, it was confirmed that profitability, innovativeness, and self-expression had a positive effect on perceived characteristics, and that perceived usefulness, perceived enjoyment, and social influence had a positive effect on intention to use. Through the research results, practical implications for efficient service operation that meets the needs of users are presented to M2E platform providers.

• Proceedings of the IEEK Conference
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• 2000.11d
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• pp.243-246
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• 2000

Recently, PC monitor users have been replacing cathode ray tubes (CRT) with liquid crystal displays (LCD). But the chromaticity of the primaries are dependent on RGB input signals. And the colorimetry of LCD changes with gray scale and has a poor peformance in color reproduction. In this paper we propose the enhanced algorithm of color reproduction considering color leakage error and black subpixel error in LCD. In order to test peformance of this algorithm we use the colors of Macbeth colorcheck. As a result of experiments, it was confirmed that the color difference of the LCD using the proposed algorithm was considerably reduced.

• Journal of the Korean Institute of Telematics and Electronics
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• v.14 no.1
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• pp.1-4
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• 1977

In the description and design of certain kinds of sequential machines, we often meet inadequacies of traditional models we adopt to use. To Lessen these inconveniencies, this paper aims to define polymachine as a new basic model of sequential machine. Polymachine, defind on the level of state model, is composed of an index which is and independent componet and a polymer which, as a dependent component, consists of many element machines. In the meantime, some basic characters of the machine are illustrated and discussed in detail, in order to present the usefulness of polymachine.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.754-757
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• 2001

Expression of the vhb gene encoding bacterial hemoglobin (VHb) from Vitreoscilla has been used to improve recombinant cell growth and enhance product formation under microaerobic conditions because of its ability to enhance oxygen use. We coexpressed GFP and VHb in Escherichia coli BL21 and W3110, and compared with GFP control which was not expressed VHb. We used nar oxygen-dependent inducible promoter for VHb expression. The GFP amounts in E. coli expressed VHb was about five fold higher than in the control Fluorescence intensity was increased about two fold.

• Communications of the Korean Mathematical Society
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• v.20 no.3
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• pp.589-602
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• 2005

We present the numerical algorithm for the model for high-strain rate deformation in hyperelastic-viscoplastic materials based on a fully conservative Eulerian formulation by Plohr and Sharp. We use a hyperelastic equation of state and the modified Steinberg and Lund's rate dependent plasticity model for plasticity. A two-dimensional approximate Riemann solver is constructed in an unsplit manner to resolve the complex wave structure and combined with the second order TVD flux. Numerical results are also presented.