• Journal of Industrial Technology
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• v.22 no.B
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• pp.163-167
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• 2002

Autonomic nervous system play an important role of keeping our health as balancing homeostasis. But the abnormality of these abilities makes our presence be feeble. To obtain these information of body which helps for us to decide whether one is healthy or not, based on the study of Heart Rate Variability. In this paper, we presented HRV model and its processing steps to extract some information of human body. After that, some experimental results are presented in time-domain and frequency-domain.

• The Bulletin of The Korean Astronomical Society
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• v.46 no.2
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• pp.39.1-39.1
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• 2021

In this presentation, study of the energetic astronomical phenomena, active galactic nucleus (AGN) and gravitational wave (GW) source, with time-series observation will be reported. They emit large amounts of energy and play an important role in the history of the Universe. First, intra-night variability of AGNs is studied using Korea Microlensing Telescope Network (KMTNet). Second topic is photometric reverberation mapping which is applied for 11 AGNs with medium-bands and Lee Sang Gak Telescope. Last, three gravitational wave events were followed-up by various optical telescopes. Each topic will be specifically addressed in the presentation.

• Journal of Korea Game Society
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• v.15 no.6
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• pp.55-64
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• 2015

This study started for the verification of the worry in the relationship within violent game use and youth moral. The survey was conducted and analyze some personal factor: self control, self esteem, aggression and game time. Self control and self esteem show positive relationship with moral, but aggression shows negative relationship. The other side, game use time doesn't show any relationship with moral whether the game is aggressive or not. It is significant for the game has no relations about a laxity of moral fiber of youth and the aggression of the game doesn't show any negative influence on moral.

• 한국경영정보학회:학술대회논문집
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• 2007.06a
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• pp.661-666
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• 2007

MMORPG, massively multi-players in online role-playing game, is the most popular genre in online games. Because large number of players interacts with each other, virtual worlds in MMORPG are alike communities of real worlds. Moreover, players in virtual worlds trade game items with real money. This paper is to find impacts of real-money trading into real worlds, and game operators, by using two-period model between players of the game and the game operator. It was found that real-money trading benefits game operators, and there exists optimal supply of game items to maximize the profit of game operator. Moreover we found that the income disparity in real worlds could be decreased when real-money trading is allowed To support the analytical model, we used an empirical analysis using real-money trading data, and find the relationship among play time of MMORPG, transaction volume of real-money trading, and price of game items. In empirical analysis, it was found that real-money trading benefits game operators. Moreover, it was found that play time and price have positive relationship.

• Journal of the Korea Society of Computer and Information
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• v.7 no.4
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• pp.40-45
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• 2002

There has been several meaning full efforts to save costs and expand the life-time of a system in changeful If circumstance. It was a module-based architecture that empower productivity at structured programming. It couldn't grow nor evolve, but could raise only calling frequency of module. But OOP or OO-method overcome limit of structured programing by class inheritance and/or overloading and/or over-riding. A component centric architecture, what is mixture of distributed systems, like CORBA. COM+ or EJB/J2EE with OOP. can support not only high reusability or expansion of life-time but also Plug-&-Play between component. In now day. It is not problem of component building but problem of interoperability between heterogeneous CBD Platform. At this study, the enhanced referential component architecture will be suggested.

• Korean Journal of Child Studies
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• v.18 no.1
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• pp.143-162
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• 1997

This qualitative study explores the development of young Korean children's reading stances and responses to children's books and discusses their literacy development in relation to school reading experiences. Rosenblatt's theory (1978) of aesthetic and efferent stances is used to characterize the relationship between the reader and the text. A teacher's reading stances in the official school world are analyzed and their relationships to children's stances and responses are discussed. The teacher's efferent stance encouraged her children's responses to he efferent as well. It also influenced children's assumptions and expectations about the teacher's reading activities, so that the children came to view these activities only as ways of obtaining factual knowledge and practicing literacy skills. The children's own interests and intentions during free play time are described in order to understand children's reading stances in the unofficial school world. The children showed various types of stances during free play time even though they were encouraged to take only one type of stance, i.e., an efferent stance, in the official school world. The findings are discussed In terms of their implications for classroom practice and literacy research.

• School Mathematics
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• v.18 no.2
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• pp.231-256
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• 2016

In this paper I will look into achievement standards which show gender difference. This work is based on the average of percentage of correct answer about items taken in National Assessment of Educational Achievement (2010~2014) at each male and female student of middle school. Achievement standard becomes the basic unit when teachers make study plans as the smallest unit that composes the curriculum. Study plans are expressed concretely according to lesson time numbers, and then lesson time numbers are determined by achievement standards. Therefore, objective informations about gender difference appearing in achievement standards will play an important role in embodiment of programs to obliterate gender difference when teachers make study plans. Also This research is expected to play a role as an indicator in studying on gender difference in mathematics education.

• Journal of the Korea Society of Computer and Information
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• v.6 no.3
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• pp.23-28
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• 2001

There has been several meaning full efforts to save costs on system development and expand the life-time of a system in changeful IT circumstance. It was a module-based architecture that empower productivity at structured programming era. But it couldn't grow nor evolve, but could raise only calling frequency of module. But OOP or OO-method overcome limit of structured programing by class inheritance and/or overloading and/or over-riding. A component centric architecture, what is mixture of distributed systems, like CORBA or DCOM with OOP, can support not only high reusability or expansion of life-time but also Plug-&-Play between them. To assemble these component to build a new system in easy way, the well-formed specification of a component is highly required. At this study, the enhanced referential component architecture and its UML specification will be suggested.

• Journal of Industrial Convergence
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• v.13 no.1
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• pp.41-47
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• 2015

The purpose of this study was to investigate how environment-friendly activities through nature affects attitude of children. 5-6 years old children were targeted for study from March to December, 2014. Rapid changes of modern society made increase of female workers and their participation rates in economic activity which results children to play more time with artificial toys and media. There are 3 stages to investigate effects. $1^{st}$ stage is to know about woods by visiting woods and experience environment-friendly activity. $2^{nd}$ stage is to experience woods with 5 senses not only in real woods but also in classroom. Lastly $3^{rd}$ stage is to make art work with natural object and make woods in classroom. Changes of hildren's attitude and view toward to the nature were recorded and analyzed by anecdotes perpetual inventory and environment-friendly attitude examination. By analysis of infant gives you the opportunity to encounter nature, often in conjunction with ongoing enjoys nature-friendly program in the classroom to play with toys, rather than a complete natural objects gradually formalized when presenting a natural, concentrated than the previous game this time is enhanced and creativity through nature through the promotion doeeojim and attitude to nature is also eco-friendly activities byeonhwadoem program showed that the impact on the attitude of the infant.

• The Journal of the Acoustical Society of Korea
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• v.27 no.3E
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• pp.104-111
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• 2008

Recently, a method for robust time reversal focusing has been introduced to extend the period of stable focusing in time-dependent ocean environments [S. Kim et al., J. Acoust. Soc. Am. 114, 145-157, (2003)]. In this study, concept of focal-size broadening based on waveguide invariant theory in an ocean time reversal acoustics is described. It is achieved by imposing the multiple location constraints. The signal vector used in multiple location constraints are found from the theory on waveguide invariant for frequency band corresponding the extended focal range. The broadening of foci in an ocean waveguide can play an important role in the application of time reversal processing, particularly to the underwater acoustic communication with moving vehicles. The proposed method is demonstrated in the context of the underwater acoustic communication from the transmit/receive array (TRA) to a slowly moving vehicle.