• Journal of the Speleological Society of Korea
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• no.82
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• pp.17-25
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• 2007

The use of a low-frequency cave radio can also verify survey accuracy. A receiving unit on the surface can pinpoint the depth and location of a transmitter in a cave passage by measurement of the geometry of its radio waves. A survey over the surface from the receiver back to the cave entrance forms an artificial loop with the underground survey, whose loop-closure error can then be determined. In the past, caves were reluctant to redraw complex cave maps after detecting survey errors. Today, computer cartography can automatically redraw cave maps after data has been corrected.

• Korean Journal of Mathematics
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• v.23 no.4
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• pp.643-654
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• 2015

This study analyses the cross-application system, one of the diversified college admission processes, based on the entrance examination system by the reorganization of the education curriculum. In addition, this study suggests an improvement direction of mathematics education for students who cross-apply by comparing and analysing academic results in Calculus for those students entering universities through the cross-application system.

• Journal of Energy Engineering
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• v.21 no.1
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• pp.18-25
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• 2012

This work investigated the influence of the chimney dimensions(exit and entrance length, and diameter) on the heat transfer of a vertical cylinder in a duct. The measured mass transfer rates for the natural convection of vertical cylinder in a duct were presented for Prandlt number 2,094, Rayleigh number in the range of $4.55{\times}10^9$, $5.79{\times}10^{10}$, and $1.69{\times}10^{11}$. Experiments were performed using a copper sulfate electroplating system to simulate heat transfer based upon the analogy concept. The diameter of the duct was varied from 0.06 m to 0.14 m, and the heights from 0.30 m to 1.10 m. Nusselt numbers measured at open channel condition agreed well with the existing laminar heat transfer correlations for vertical plate developed by Le Fevre. The increase of the exit length enhanced the heat transfer up to a certain duct height but further increase does not affects the heat transfer. The heat transfer decreased with increasing the entrance length up to a certain duct height and was constant at further increase. The Nusselt number decreased with increasing the diameter of duct, until Nusselt number becomes similar to that at open channel beyond a certain diameter.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.12
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• pp.247-253
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• 2013

The purpose is a comparative evaluation in the DR System according to the dosimetry and image quality of the quantitative and objective via Direct digital radiography, Indirect digital radiography, Image intensifier (Charge Coupled Device type) digital radiography. The experimental method used rando phantom and measured the entrance surface dose. And through using the measured entrance surface dose and then using the PCXMC program were evaluated risk due to irradiation and the effective dose. SNR and NPS and CNR were measured and analyzed by using 21cm acryl phantom. Significance of measured value was evaluated by statistics method. Entrance surface dose, major organ dose, effective dose all of them were measured the lowest rated in direct DR when it is on the basis of direct DR dose, high-dose ratio were measured in I.I DR approximately 1.3 times, indirect DR approximately 2.4 times. Risk in accordance with radiation also was measured same as dose ratio. On the conclusion that SNR measurement result based on direct DR SNR measurements, low-SNR ratio were measured in I.I DR approximately 7.25 times, indirect DR approximately 1.48 times. On the conclusion that CNR measurement result based on direct DR CNR measurements, high-dose ratio were measured in I.I type DR approximately 1.16 tims and low-dose ratio were measured in indirect DR approximately 0.87 times. Therefore Direct DR system using a-selenium sensing element to detect x-ray photon is thought effectively at the examination such as infant to sensitive irradiation and the genital gland. Because quality image is built by low dose. Also when it is necessary that image test requiring many diagnosis information, indirect DR system is thought effectively.

• Applied Microscopy
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• v.40 no.4
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• pp.237-244
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• 2010

Utricularia forms small, but complex carnivorous trap along the stem either in water or in soil depending upon species. The shapes and sizes of the traps, appendages, and trichomes are known to differ among aquatic, terrestrial and epiphytic species. In the present study, the morphology and microstructure of the trap in aquatic Utricularia japonica and terrestrial U. livida were examined using light and electron microscopy. The aim of this study was to compare the characteristics of trap features between the aquatic and terrestrial species. The trap was found to be comprised of a thin walled bladder with numerous capitate trichomes, two-armed bifid and four-armed quadrifid glands in both species; however, the traps of the two species were different in size, and number and morphology of the trichomes and glands. Aquatic Utricularia was chlorenchymatous with chloroplasts distributed throughout the body, whereas the terrestrial species was translucent without plastids due to an adaptation to underground habitats. Furthermore, the former differed considerably in that the traps developed antenna and appendages around the entrance area. A peculiar trap entrance was also noted in U. livida, which exhibited radiating rows of various trichomes within funnel-shaped tissue. A large number of glandular trichomes covered the entrance area and door surface with four trigger hairs each in the aquatic form but only two in the terrestrial form. The glandular trichomes near the door secreted a large amount of mucilage that temporarily composed the velum in the U. japonica, however, it was not observed in the terrestrial species. All of the aforementioned features were highly related in their structure and function during carnivorous mechanism in Utricularia. The current findings provide important data for further comparison of the different life forms within Utricularia.

• Journal of Korean Home Economics Education Association
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• v.18 no.2 s.40
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• pp.47-62
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• 2006

This research was conducted to find out price change of education service. Consumer Price Index annual series data in Korea National Statistical office from 1990 to 2004 were used for analysis. First, education price indexes showed an average annual increase of 7.3% during the last 15 years (1990-2004), marking the highest increase among items in the CPI basket. The average annual increase in tuition fees and other fees, expenditure classes of education price. has been 7.5% and 6.0%, respectively. Secondly, an average increase in tuition fees for two-year college was higher, followed by tuition fees for kindergarten, private four-year college, national four-year college and secondary schools. An average increase in primary school textbook costs was higher in the category of 'other fees' followed by junior high school textbook costs, junior high school supplementary book costs and home delivery supplementary book costs Thirdly, there were no differences in price changes of secondary school textbooks, junior high school supplementary books, high school supplementary books among 16 locations. An average increase in after-school education (selective subjects) for college entrance examination was higher in Gwangju but lower in Seoul, compared with other cities. An average of 7% difference was seen annually among regions. When the year 2000 was considered as 100, the most significant gains were seen in Kwangju at 80% and Gangwon at 57%. An increase in after-school education (all subjects) for college entrance examination was higher in South Cholla Province but lower in North Gyeongsang Province. An increase in after-school education (all subjects) for college entrance examination was higher in South Cholla Province but lower in North Gyeongsang Province. An average of 7% difference was seen annually in the annual increase. When the year 2000 was considered 100, most significant increase was seen in Busan and South Gyeongsang Province at 37% and Jeju Island at 34%.

• The Journal of Korean Society for School & Community Health Education
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• v.22 no.4
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• pp.25-37
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• 2021

Objectives: Reportedly, the main influential factors on students' adaptation to their college life were social support, stress, adaptation resilience, self-esteem, and satisfaction with their major. This study tried to find the actual influence of these factors on dental hygiene students, and to find an intervention plan for improving their adaptation to college life and preventing their dropout. Methods: An online questionnaire survey had been conducted with 270 dental hygiene students from June 21 to July 2, 2021. The collected data were analyzed with the use of SPSS Program Version 22.0. Results: Firstly, students living together with their family, those satisfied with their major, and those doing a club activity related to their major scored high points in terms of the adaptation to college life. In addition, the adaptation points were high in those whose school entrance motivation was arbitrary, and in those who entered in the dental hygiene department in consideration of their aptitude. Secondly, college life stress was high in those whose entrance motivation was in other persons' will, those who entered in the department due to their school record and occupation, rather than aptitude, those who were also doing a part-time job, and those whose economic level was low. Thirdly, adaptation resilience, social support, and self-esteem were high in those who were highly satisfied with their major, those who entered in the department in consideration of aptitude, and those whose economic level was high. Fourthly, the biggest influential factor on their adaptation to college life was college life stress, followed by self-esteem, satisfaction with major, and adaptation resilience in order. Conclusion: Given all the results, it is necessary to analyze dental hygiene students' levels of stress, self-esteem, social support, and adaptation resilience from the beginning of their entrance, and to operate a school life adaptation program in line with school years. If any customized support and training are given to these students to deal with a variety of stress situations resiliently and wisely and achieve their jobs successfully, it is expected to improve their self-esteem and adaptation resilience, and thereby increase their adaptation to college life.

• Journal of the Korea Convergence Society
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• v.13 no.4
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• pp.45-51
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• 2022

Fear of contact exists due to the prevention of the spread of infectious diseases such as COVID-19. When using the common entrance door of an apartment, access is possible only if the resident enters a password or obtains the resident's permission. There is the inconvenience of having to manually enter the number and password for the common entrance door to enter. Also, contactless entry is required due to COVID-19. Due to the development of ICT, users can be easily identified through the development of face recognition and voice recognition technology. The proposed method detects a visitor's face through a CCTV or camera attached to the common entrance door, recognizes the face, and identifies it as a registered resident. Then, based on the registered information of the resident, it is possible to operate without contact by interworking with the elevator on the server. In particular, if face recognition fails with a hat or mask, the visitor is identified by voice or additional authentication of the visitor is performed based on the voice message. It is possible to block the spread of contagiousness without leaving any contactless function and fingerprint information when entering and exiting the front door of an apartment house, and without the inconvenience of access.

• Journal of The Korean Association of Information Education
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• v.21 no.1
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• pp.33-40
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• 2017

The purpose of this study is to compare the differences in academic achievement, department satisfaction, and department preference according to the entrance admission for the computer education of G National University of Education. As a result of collecting and analyzing, for three years, the academic achievement data of the students who have excelled in the specific area and regular entering students, it is found that the achievement of the students who excelled in the specific area is relatively higher. The results of the questionnaire survey showed that students who excel in specific areas were more satisfied with their departments than those who entered regularly. The reason for the high academic achievement and academic satisfaction of the students in the specific area seems to be the high loyalty to the department by the students who are interested in the computer. Therefore, it can be seen that it is necessary to consider how to select students for each enriched course at the entrance examination of education universities. In addition, as the era of the fourth industrial revolution comes, the number of students wishing to pursue computer education is expected to increase.

• Physical Therapy Korea
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• v.10 no.2
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• pp.23-44
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• 2003

The purposes of this study were to investigate the accomodations for the disabled children of the elementary schools in Suwon and to give helpful information to the parents and teachers for the improvement of the independence of disabled children at school. We measured the ramps, toilets, doorways and other accomodations in 64 elementary schools according to the checklists. The checklists of these facilities were based on the legal requirements of "The Act for the Benefit of the Disabled, Elderly and Pregnant Women". The data was analyzed by descriptive statistics and the ${\chi}^2$ test. None of the investigated schools satisfied all the legal requirements of the facilities. Fifteen elementary schools had adequate accomodations for the disabled children which allowed them to move independently from the entrance of the school to their classrooms located on the first floor. Only eight of fifteen schools had elevators to access their classrooms upstairs. The schools were divided into two groups according to their construction dates; before and after April 11th 1998, when "The Act for the Benefit of the Disabled, Elderly and Pregnant Women" took effect. There were statistically significant differences in the number of toilets, the width of the toilet entrance, and the slope of the ramps between the two groups (p<.05). We suggest that the accomodations for the disabled children need to be established on a systematic and on-going basis in the future. The teachers and administrators should be more aware of the legal requirements for appropriate accomodations for the disabled children.