• Nuclear Engineering and Technology
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• v.5 no.1
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• pp.30-37
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• 1973

The Nishitani's equations for impedance of anodic oxide films have been derived based on a p-i-n model under the assumption of $\omega$$\varepsilon$$\rho$$_{ο}$<<4$\pi$<<$\omega$$\varepsilon$$\rho$$_{\omega}$, where $\omega$ is angular frequency, $\varepsilon$ is dielectric constant, and $\rho$$_{ο}$ and $\rho$$_{\omega}$ are the resistivity of the interface region and the intrisic region of the anodic oxide film, respectively. Since it is not possible to evaluate all parameters in the equations, however, any clear physical picture cannot be obtained from the equations. Therefore, the equations are modified under the assumption of $\omega$$\tau$$_{\omega}$>>1 and In(1+$\omega$$^2$$\tau$$_{ο}$$^2$)<<1, where $\tau$$_{\omega}$=$\varepsilon$$\rho$$_{\omega}$(4$\pi$) and $\tau$$_{ο}$=$\varepsilon$$\rho$$_{ο}$/(4$\pi$). The modified equations are then used to explain the change in the frequency characteristics of anodic oxide films when they are heated. The change in impedance of anodic oxide films when they are heated is attributed mainly to the increase in the diffusion layer and to the decrease in the resistivity of anodic oxide films.s.

• Korea journal of population studies
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• v.34 no.1
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• pp.129-157
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• 2011

This study attempts to analyze the effect of level of education on the attitudes toward immigrants or foreign workers. More specifically, we examine whether there is significant difference in the effects of the level of education and global mind on the attitude among three East Asian countries (South Korea, Japan, and Taiwan), controlling other socio-demographic factors in relation to increase in immigrants and foreign workers. Using EASS data, we employs sequential logit model to the general attitudes toward immigrant workers into the weighted sum of transition probability within each educational level. One major finding is that there is clear and significant difference in the relationship between the level of education and the attitudes toward foreign workers among three countries. In general, while Japanese and Taiwanese tend to have more open-minded attitudes toward foreign workers as they have higher level of education, Koreans are opposite case that they are little bit more hostile toward to foreign workers with higher level of education. Especially, there is strong positive effect of education on the attitude in Taiwanese case. Another finding is that while there is strong resistance against increase in migrant population in Korea and Taiwan, Japanese respondents want current level of foreign population to remain in the similar level. Our findings imply that there is no one converging pattern of relationship between the level of education and the positive attitudes toward foreign workers which can be applied to any country. Therefore, this paper suggests that unique political, social, and cultural characteristics of each country should be considered to better understand the effect of education on the attitude toward immigrants and foreign workers. Also, we conclude that systematic comparative-demographic analyses should be utilized to provide more comprehensive picture of how difference in educational level affects the attitude toward immigrants and foreign workers.

• Journal of the Korean Chemical Society
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• v.43 no.3
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• pp.340-350
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• 1999

This study was to analyze the articulation between chemistry contents of science textbooks at elementary and middle school level, to survey students ? perceptions on chemistry concepts, to establish guidelines for science textbooks that not only meet the needs of learners but also fit in a coherent way. In order to do this, we analyzed links of the aims and the organization of chemistry contents of elementary and middle school science textbooks, we also surveyed students' perceptions on chemistry concepts students had retained. The study revealed that the 6th middle school curriculum was almost a duplicate of the elementary school syllabus. And there was no interrelation between the organization of chemistry contents and the aim of the chapter which built up a logical picture of the world at a molecular level. It was also found that the lack of coherence between science textbooks in elementary and middle school was a major cause of student difficulty.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.6
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• pp.1317-1328
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• 2009

As a study on how the Neurofeedback training effects on young children's brain function and intelligence, first, this paper aims to verity the effect Neurofeedback training brings to the function of young children's brain. Second, through K-WPPSI IQ test, analyses how Neurofeedback training influences on the development of young children's intelligence. The subjects of this study were the 60 five-year children attenging J kindergarten in Cheon-an, experimnet treatment was performed according to Neurofeedback training guidance from Aprile 21 to December 12, 2008. It analyzes the states of brain waves before and after the Neurofeedback training, and performed the statistical analysis through t-test, using SPSS for Window(V.13.0) package. As a result of analysis, it was shown that firstly Neurofeedback training was very effective on the d!evelopment of infan's brain intelligence, since the quotient to evaluate the entire brain function appeared to have a meaningful influence. Secondly, it was proved that Neurofeedback training had much influence on the object assembly-area, the maze-area, and picture completion-area, and that it had the same influence on the performance intelligence quotient too. So, such results as these one make us realize that Neurofeedback training is a very effective method to the development of performance intelligence quotient. Thirdly, they indicate that Neurofeedback training hasn't a meaningful influence on verbal intelligence quotient, since it affects only on the similarities area among verbal intelligence quotient, the total evaluative quotient.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.2
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• pp.132-140
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• 2001

This paper proposes an efficient walktlu-ough animation from two images of the same scene. To make animation easily and fast, Tour Into the Picture(TIP) enables walkthrough animation from single image but lacks the reality of its foreground object when the viewpoint moves from side to side, and view morphing uses only 2D transition between two images but restricts its camera path on the line between two views. By combining advantages of these two image-based techniques, this paper suggests a new virtual navigation technique which enable natural scene transformation when the viewpoint changes in the side-to-side direction as well as in the depth direction. In our method, view morphing is employed only in foreground objects , and background scene which is perceived carelessly is mapped into cube-like 3D model as in TIP, so as to save laborious 3D reconstruction costs and improve visual realism simultaneously. To do this, we newly define a camera transformation between two images from the relationship of the spidery mesh transformation and its corresponding 3D view change. The result animation shows that our method creates a realistic 3D virtual navigation using a simple interface.

• Journal of the Korean Magnetics Society
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• v.16 no.3
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• pp.157-162
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• 2006

In this study, a high sensitive giant magnetoresistance-spin valve (GMR-SV) bio-sensing device with high linearity and very low hysteresis was fabricated by photolithography and ion beam deposition sputtering system. Detection of the Fe-hemoglobin inside in a red blood and magnetic nanoparticles using the GMR-SV bio-sensing device was investigated. Here a human's red blood includes hemoglobin, and the nanoparticles are the Co-ferrite magnetic particles coated with a shell of amorphous silica which the average size of the water-soluble bare cobalt nanoparticles was about 9 nm with total size of about 50 nm. When 1 mA sensing current was applied to the current electrode in the patterned active GMR-SV devices with areas of $5x10{\mu}m^2 $ and $2x6{\mu}m^2 $, the output signals of the GMRSV sensor were about 100 mV and 14 mV, respectively. In addition, the maximum sensitivity of the fabricated GMR-SV sensor was about $0.1{\sim}0.8%/Oe$. The magnitude of output voltage signals was obtained from four-probe magnetoresistive measured system, and the picture of real-time motion images was monitored by an optical microscope. Even one drop of human blood and nanopartices in distilled water were found to be enough for detecting and analyzing their signals clearly.

• Korean Journal of Digital Imaging in Medicine
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• v.5 no.1
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• pp.32-44
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• 2002

The role of radiology department has been greatly increased in the past few years as the technology in the medical imaging devices improved and the introduction of PACS (Picture Archiving and Communications System) to the conventional film-based diagnostic structure is a truly remarkable factor to the medical history. In addition, the value of using digital information in medical imaging is highly expected to grow as the technology over the computer and the network improves. However, the current medical practice, using PACS is somewhat limited compared to the film-based conventional one due to a poor image quality. The image quality is the most important and inevitable factor in the PACS environment and it is one of the most necessary steps to more wide practice of digital imaging. The existing image quality control tools are limited in controlling images produced from the medical modalities, because they cannot display the real image changing status. Thus, the image quality is distorted and the ability to diagnosis becomes hindered compared to the one of the film-based practice. In addition, the workflow of the radiologist greatly increases; as every doctor has to perform his or her own image quality control every time they view images produced from the medical modalities. To resolve these kinds of problems and enhance current medical practice under the PACS environment, we have developed a program to display a better image quality by using the ROI optical density of the existing gray level values. When the LUT is used properly, small detailed regions, which cannot be seen by using the existing image quality controls are easily displayed and thus, greatly improves digital medical practice. The purpose of this study is to provide an easier medical practice to physicians, by applying the technology of converting the H-D curves of the analog film screen to the digital imaging technology and to preset image quality control values to each exposed body part, modality and group of physicians for a better and easier medical practice. We have asked to 5 well known professional physicians to compare image quality of the same set of exam by using the two different methods: existing image quality control and the LUT technology. As the result, the LUT technology was enormously favored over the existing image quality control method. All the physicians have pointed out the far more superiority of the LUT over the existing image quality control method and highly praised its ability to display small detailed regions, which cannot be displayed by existing image quality control tools. Two physicians expressed the necessity of presetting the LUT values for each exposed body part. Overall, the LUT technology yielded a great interest among the physicians and highly praised for its ability to overcome currently embedded problems of PACS. We strongly believe that the LUT technology can enhance the current medical practice and open a new beginning in the future medical imaging.

• The Journal of the Korea Contents Association
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• v.12 no.6
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• pp.508-517
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• 2012

Admissions officer system was introduced in an effort to reject the score-oriented competition and select students on the basis of their individual potential and capacity. The admissions officer system, which was first introduced into the college entrance examination for the 2008 school year in Korea, has been operated by expanding the recruiting level up to 11.8% of the number of the students to be admitted by all colleges. The aim of this study is to analyze the performance of the admissions officer system by analyzing the true picture of school life led by the students singled out through admissions officer screening, and further to inquire into the substantial plan to support the students, who were selected through the admissions officer system, for their successful college life while displaying their potential and capacity As a result of doing research on this, it was found that the freshmen selected through admissions officer screening showed more positive responses in all measurement variables this study selected, such as school adaptability, school satisfaction, and career maturity, learning attitude than other students screened in a different way; in addition, school adaptability and school satisfaction came out as significantly high variables statistically. However, they showed insufficiency in the attitude in class from the behavioral aspect in learning attitude. This study made a suggestion that it's necessary for systematic support and management program to be mapped out and provided in order for the students selected through admissions officer screening to improve their learning attitude as they inspire themselves with school adaptability and school satisfaction.

• The Journal of the Korea Contents Association
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• v.13 no.4
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• pp.469-480
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• 2013

The purpose of this study is to investigate young children's user experience on three types of dramatic activity: traditional dramatic activities, dramatic activities relying on robot projector based augmented reality and creative dramatic activities relying on robot projector based augmented reality. Participants were 20 five-year-old children attending D kindergarten, in Seoul, Korea. They read 3 picture books, then did 3 types of dramatic activities in order. Participants were divided into 3 groups in each activity then they took a role as actors and audiences in order. After all dramatic activities had been done, participants had been interviewed regarding to user experience. The findings of this study are as follows; First, the most interesting dramatic activity for young children was creative dramatic activities relying on robot projector based augmented reality. On the other hand, the least interesting activity was traditional dramatic activities. Second, They answered it the easiest one for them the dramatic activities relying on robot projector based augmented reality, whereas the hardest one was the creative dramatic activities relying on robot projector based augmented reality. Thirdly, all the participants answered that it was not hard for them to use the technology embedded in dramatic activities relying on robot projector based augmented reality. They acknowledged the effects of augmented reality technology and the role of robot as well. The result of this study would suggest the feasibility of new technology promoting young children's digital literacy.

• Smart Media Journal
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• v.3 no.1
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• pp.52-62
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• 2014

Prevalence of common three-dimensional display progresses, increasing the demand for three-dimensional content. Starting from the year 2010 to meet increasing 2D to 3D conversion is insufficient to meet demand content was presented as an alternative. But, Convert 2D to 3D stereo effect only emphasizes content production as a three-dimensional visual fatigue and the degradation of the Quality problems are pointed out. In this study, opened in 2011 'Scenes Guan', the 13 selected Scene is made of the three-dimensional transform the content and the Quality of the transformation applied to the Depth-Map is a visual representation of three-dimensional fatigue and, the adequacy of whether the expert has group interviews and surveys were conducted. Many of the changes are applied to the motion picture of the three-dimensional configurations of Depth-Map conversion technology used in many ways before and after the analysis of the relationship of cascade configurations to create a depth map to the stage. Experiments, presented in this study is a three-dimensional configuration of Depth-Map transformation can lower the production of a three-dimensional visual fatigue and improve the results obtained for a reasonable place was more than half of the experiment accepted the expert group to show a positive reaction were. The results of this study with a rapid movement to convert 2D images into 3D images of applying Depth-map configuration cascade manner to reduce the visual fatigue, to increase the efficiency, and has a three-dimensional perception is the result derived.