• The Journal of Korean Association of Computer Education
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• v.16 no.2
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• pp.69-78
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• 2013

For the increasingly complicated and technology dependent 21st century, ICT literacy is being emphasized by education authorities as a key ability needed to succeed in a knowledge-based society. Accordingly, since 2007, several studies have been conducted to measure the ICT literacy levels of students. This study aimed at analyzing how ICT literacy levels vary according to students' skill sets from the viewpoint of educational convenience. To fulfill this goal, the ICT literacy abilities of 167 elementary students and 159 middle school students (all receiving education at "gifted students" education centers) were compared with the following results. First, elementary students displayed differences with regards to 'computer and network' and 'information society and ethics' among the content elements, and 'critical mind' and 'information communication' among capability elements according to their skill sets. Second, middle school students displayed differences with regards to 'information society and ethics' and 'information organization and creation' elements according to their skill sets. The significance of this study lies in the fact that it measured the ICT literacy levels of --and made suggestions for education to-- students specially gifted in information, science and mathematics rather than general students.

• The Korean Journal of Applied Statistics
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• v.27 no.1
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• pp.31-41
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• 2014

Biplot is a useful graphical method to simultaneously explore the rows and columns of a two-way data matrix. In particular, principal component factor biplot is a graphical method to describe the interrelationship among many variables in terms of a few underlying but unobservable random variables called factors. If we consider the unobservable variables (which are mutually independent and also non-Gaussian), we can apply the independent component analysis decomposing a mixture of non-Gaussian in its independent components. In this case, if we apply the principal component factor analysis, we cannot clearly describe the interrelationship among many variables. Therefore, in this study, we apply the independent component analysis of Jutten and Herault (1991) decomposing a mixture of non-Gaussian in its independent components. We suggest an independent component biplot to interpret the independent component analysis graphically.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.1-6
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• 2011

In this paper, an 1.5Gbit/s wireless data transmission system using the carrier frequency of 300 GHz band was implemented. The RF front-end was composed of schottky diode sub-harmonic mixer, frequency tripler, and horn antennas for transmitter and receiver, respectively. The LO frequencies of sub-harmonic mixer are 150GHz for transmit chain and 156GHz for receive chain. The ASK(Amplitude Shift Keying) modulation was used in the transmitter and the envelope detection method was used in the heterodyne receiver. The conversion loss of sub-harmonic mixer and implementation system loss were measured to be 9.8dB and 1.2dB, respectively. The 1.5Gbit/s video signal with HD-SDI format was transmitted over wireless distance of 40cm without optical lens(4.2m with optical lens) and displayed on HDTV at the transmitted average output power of $20{\mu}W$.

• The Journal of Korean Association of Computer Education
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• v.11 no.1
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• pp.33-46
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• 2008

There exist many differences between new Informatics curriculum and the current Computer curriculum. Since the new curriculum introduces new section of "Problem-solving methods and procedures" which are not included in current computer curriculum, it is required to define and specify objectives and content units of "problem solving methods" and "programming" topics for the new section. In this paper, we define and specify the objectives and detailed contents by surveying various computer curriculums used in many other countries. Then, the specified objectives and content units are validated by a group of computer education experts. The final results of specified objectives show that areas of "comprehension", "application" and "synthesis" take relatively high percentage over the other areas. In the content specification, we set the content structure by describing how to solve a given real-world problem with a non-computerized way, followed by representing or transforming it with a corresponding computerized model.

• The Journal of Korean Association of Computer Education
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• v.21 no.1
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• pp.1-10
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• 2018

Korea shifted the focus to competency-based curriculums in the revised national curriculum of 2015, and emphasized training creative convergence talents through informatics education. The informatics education curriculum included information culture literacy as a core competence so that the learners can gain knowledge of information technology-based information ethics and make ethical judgment and practice ethics. This study analyzed the elements related to information culture literacy in the informatics curriculums of the US, the UK, India, Japan, Australia and Germany for the purpose of providing implications with regard to the composition of elements that can foster information culture literacy. According to the analysis results, first, the term information culture literacy was included only in the informatics education curriculum of Korea. Second, the elements common to all countries are (personal) information protection, information security and copyright. Third, Korea's information society and career, India's avoidance of injuries, Germany's protection of health and environment were found only in the curriculums of respective countries. This study is significant in that it provided the orientation of improving the elements for fostering information culture literacy based on the results of analyzing overseas informatics curriculums.

• Korean Journal of Childcare and Education
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• v.9 no.6
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• pp.51-72
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• 2013

The purpose of this study was to compare the school readiness between children in low-income families and children in non-low-income families. In particular, it examined the influence of family's income levels child's age and gender upon children's school readiness. The subjects were 184 children that were 4~5 years. The collected data were analysed using t-tests, one-way ANOVA, two-way ANOVA, and Scheffe test. The results showed that the school readiness of children from non-low-income families's was higher than children from low-income families. The school readiness was explained significantly by the interaction effect of children's age and gender. However, there was no difference in children's school readiness according to the participation in Dream Start. The findings suggest that the level of income is the key factor in differences of children's school readiness. Finally, the importance of social support of low-income children and development of effective Dream Start programs was discussed.

• Tuberculosis and Respiratory Diseases
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• v.59 no.2
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• pp.209-212
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• 2005

Sarcoidosis, a multisystemic granulomatous disorder of unknown causes, which presents with bilateral hilar adenopathy, pulmonary infiltration, and cutaneous, ocular, bones, and nervous and reticuloendothelial systems involvement, commonly involves young adults of both sexes. Herein, the case of a 70-year-old male, with progressive hoarseness of two weeks' duration and mild dyspnea, is reported. A fiberoptic bronchoscopy, performed to investigate the hoarseness, revealed paralysis of the left vocal cord, but with no other local abnormality. Two nodules, as pathologic findings, showed noncaseating epithelioid cell granulomas. We note a rare case of sarcoidosis, with vocal cord palsy, in Korea.

• Journal of the Korean Chemical Society
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• v.46 no.1
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• pp.76-82
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• 2002

This study investigated the effects of assigning cognitive roles, a method that may promote verbal interaction in knowledge-building processes, in small-group discussion for science concept learning. Two classes (62 students) of 7th-graders respectively received a concept learning instruction through small-group discussion with assigned cognitive roles (CR) asking to explain and contradict one's idea and to synthesize and conciliate group's idea, and a concept learning instruction through small-group discussion with no specific assigned roles (NSR), for 9 class periods. After the instructions, the tests of achievement, conceptions, the perceptions on science learning environments, and the perceptions toward small-group discussion were administered. ANCOVA results revealed that low-achievers in the NSR group performed significantly better than those in the CR group. Similar tendency was also found in the scores of the conceptions test. Two groups did not differ significantly in the perceptions on science learning environments and toward small-group discussion.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.647-655
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• 2009

Colors, as a part of contents, have great implications to consumers. Each individual feels the image of colors as an outcome of the accumulated experience or knowledge of oneself. This study aims to find the personality and meaning of color images through the predicted trend colors and to analyze the consumers' attitude towards them. We found that the 5 major trend colors such as Crystal Sound, Creamy Touch, Mysterious Vintage, Autumn Forest and Carnival seem to have their own personality images. Furthermore, we discovered that Crystal Sound has an image of a self-made man, Creamy Touch a highschool girl, Mysterious Vintage a God father, Autumn Forest the public and Carnival a circus clown as a result of additional adjective image analysis. In addition, customers marked the highest preference for Creamy Touch. The research result shows that the personality of an individual and that of colors are coincide and it might bring about a positive consumer behavior. And this research has a significant meaning since it is a sort of interdisciplinary study in-between fashion and marketing and it should be studied further later.

• Journal of The Korean Association For Science Education
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• v.22 no.1
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• pp.93-101
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• 2002

This study investigated the effect of small group discussion for science concept learning in cooperative learning environments that encourage verbal interaction with peers upon students' understanding of the concepts at the particulate level, application abilities, perceptions of students' negotiation, and communication apprehension. Two classes of 7th grade at a coed middle school were assigned to the control and the treatment groups. They were taught about change of states and motion of molecules for 7 class periods. Two-way ANCOVA results revealed that the scores of a conceptions test for the treatment group were significantly higher than those for the control group, and that the low-achievers in the treatment group performed better than those in the control group. However, the scores of two groups did not differ significantly in an application test. The perceptions of students' negotiation for the treatment group were more positive, but the scores of the communication apprehension for two groups were not significantly different.