• International journal of advanced smart convergence
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• 제10권1호
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• pp.38-55
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• 2021

Recently, the use of media has become a daily life due to Covid-19, and education using media has expanded for teenagers. The purpose of this study is to empirically verify how media usage characteristics affect social relationships and school adaptation through the self-efficiency and immersion of teenagers at the youth education site. This study was collected and distributed questionnaires to 250 high school students in Seoul from November 14 to November 21, 2020. The results of the study were derived with a total of 249 questionnaires, excluding one missing questionnaire, and the hypothesis was verified using a Covariance Structure Analysis. Research has shown that, first, the existing, individual, and utility among the characteristics of using youth media have a significant effect on self-efficiency, respectively. Second, only entertainment among the characteristics of youth media use was found to have a significant effect on immersion. Third, immersion has a significant definition effect on school adaptation, and self-efficiency has been shown to have a definition impact on social relationships. Based on this study, we believe that it will be used as a fundamental resource for the development of youth media usage and policy direction in the age of the ever-changing Covid-19.

• 교육시설
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• 제5권1호
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• pp.18-32
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• 1998

This study is the consideration of related characteristics between infants of the kindergarten and the lower level children of the elementary school. The characteristics of infant's growth show the homogeneous and successive peculiarity in the aspects of physical, intellectual, emotional, language learning and social development and the characteristics of moulding expression show similarity in developmental stage. So, It is proper that the mini-school for the lower level students of kindergarten and elementary school could be built as the branch unit of neighbourhood.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제26권3호
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• pp.199-217
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• 2023

수학 교육에서 정의적 영역을 지속적으로 강조하고 있으나 학생들의 수학에 대한 자신감이나 흥미는 크게 변화하지 않고 있다. 이에 본 연구에서는 학생들의 학업 성취도에 따른 정의적 특성에 미치는 요인을 분석하였다. 연구는 학교에서의 수학 교육 요인과 사회적 환경 요인으로 구분하여 초등학교 5-6학년 학생 593명을 대상으로 실시하였다. 연구결과 초등학생들은 학업성취도와 관계없이 자신의 정의적 특성에 가장 많은 영향을 미치는 요인으로 '학교에서의 수학 수업'을 꼽았다. 그 외에 상 수준의 학생은 '수학 사교육'과 '대학 입시와 직업', 중 수준의 학생은 '학교에서의 평가'와 '수학 사교육', 하 수준의 학생은 '학교에서의 평가'와 '수학 교과서' 순으로 가장 많은 영향을 미친다고 응답하였다. 특히, 학업성취도가 낮아질수록 학생들의 수학 수업 참여도가 급격히 줄어들었으며, 그 이유로 가장 많은 학생들이 배우는 수학 내용이 너무 어려워서라고 응답하였다. 이러한 연구결과를 고려할 때, 정의적 특성을 향상시키기 위해서 '학교에서의 수학 수업'에서의 변화가 우선적으로 필요하며, 학생들의 학업성취도에 따라 정의적 특성의 향상 방안을 적용하는 것이 효과적일 것이다.

• Imaging Science in Dentistry
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• 제51권1호
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• pp.73-80
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• 2021

Purpose: The purpose of this study was to evaluate the cone-beam computed tomographic (CBCT) imaging and histopathological characteristics of osteoradionecrosis(ORN) and medication-related osteonecrosis of the jaw(MRONJ). Materials and Methods: Ten surgical specimens from segmental mandibulectomy (3 ORN and 7 MRONJ) were analyzed using CBCT. The CBCT parameters were as follows: high-resolution mode (tube voltage, 90.0 kV; tube current, 4.00 mA; rotation time, 16.8 s; field of view, 56 mm×56 mm; thickness, 0.099 mm). Histopathological characteristics were evaluated using histological slides of the surgical specimens. The Pearson chi-square test was used to compare ORN and MRONJ in terms of CBCT findings(internal texture, sequestrum, periosteal reaction and cortical perforation) and histopathological characteristics(necrotic bone, inflammatory cells, reactive bone formation, bacteria, Actinomyces, and osteoclasts). A P value less than 0.05 was considered to indicate statistical significance. Results: MRONJ showed periosteal reaction on CBCT more frequently than ORN (7 of 7 [100%] vs. 0 of 3 [0%], P<0.05). Regarding histopathological characteristics, MRONJ showed osteoclasts more frequently than ORN (6 of 7 [85.7%] vs. 0 of 3 [0%], P<0.05). Conclusion: This study evaluated the CBCT imaging and histopathological characteristics of ORN and MRONJ, and the findings suggest that CBCT could be useful for the evaluation of ORN and MRONJ.

• 교육시설
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• 제14권4호
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• pp.86-95
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• 2007

This study clarifies the theoretical background and the floor plan characteristics of component schools in Small Schools Complexes. The recent researches have proved the enhancement of students' social relationship and school security in the new school environment. The findings fur the characteristics by analyzing the component schools from six school complexes follow: (1) Students can access their classrooms in component schools through main entrances, shared corridors and private corridors. (2) Teachers' area is segregated from students' area, which does not encourage the social relationship between teachers and students. (3) Some of special classrooms, which are generally considered as shared facilities in a Small Schools Complex, are planned within component schools for accommodating specialized educational programs. (4) A component school occupying multiple floors reduces Intelligibility of space and chances of users' visual contact to colleagues. Finally, this study proposed the alternative floor planning directions in order to improve users' social relationship in a component school.

• 한국안전학회지
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• 제28권5호
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• pp.71-77
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• 2013

This Study aims at investigating actual condition on attending school road of children and analyzing empirically the characteristics of cognition and the influence of safety on school road. This study findings are as follows : 1) Walking alone to go to school is the highest rates among Commuting Mode, and Commuting distance to school is nearly doubles than range of school zone(300 m). 2) Among characteristics of urban spatial structure affecting on influence classify safety of school road, 'Commuting Distance' has been drawn to most influential variable. Especially, there are 4 types classified by commuting distance and it became obvious that the longer the distance, the lower the safety score(under 127 m=76.9 points, Over 451 m=58.3 points). 3) As a result of investigating the influence of Safety on attending school road, Vehicle commuting speed urder 127 m as internal of school zone, and Walking and crossing convenience over 451 m as external of school zone have a lot of influence on safety cognition on school road. Therefore Safety on school road should be considering the commuting distance to school among surrounding characteristics, needed for improvement plan and program based on real safety cognition of children.

• Tribology and Lubricants
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• 제25권5호
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• pp.285-291
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• 2009

In this work, durability characteristics of electrorheological (ER) fluid for damper application are experimentally investigated. ER fluid is prepared by using phosphorated starch particles and silicone oil. The field-dependent Bingham characteristics and response time for the proposed ER fluids are experimentally obtained. Experimental apparatus of durability test for ER fluid is established with cylindrical ER cylinder for mid-sized passenger vehicle. In order to evaluate the durability characteristics of ER fluid as a function of time, damping force and temperature variations are measured until one million cycles. After durability test, Bingham characteristics and response time of ER fluid are measured and compared to the initial properties. Microscopic pictures of ER fluid are taken to validate the changes of properties. The results indicate that the ER fluid can be commercially utilized in vehicle damper system with its durability performance. Moreover, the understanding of durability characteristics is essential to predict the service life of ER fluid as well as to design its applications.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2007년도 학술대회 1부
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• pp.268-273
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• 2007

In this paper, we present effective methods for automatic music recommendation system which automatically recommend music by signal processing technology. Conventional music recommendation system use users’ music downloading pattern, but the method does not consider acoustic characteristics of music. Sometimes, similarities between music are used to find similar music for recommendation in some method. However, the feature used for calculating similarities is not highly related to music characteristics at the system. Thus, our proposed method use high-level music characteristics such as rhythm pattern, timbre characteristics, and the lyrics. In addition, our proposed method store features of music, which individuals queried, to recommend music based on individual taste. Experiments show the proposed method find similar music more effectively than a conventional method. The experimental results also show that the proposed method could be used for real-time application since the processing time for calculating similarities between music, and recommending music are fast enough to be applicable for commercial purpose.

• 한국학교수학회논문집
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• 제19권1호
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• pp.83-102
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• 2016

본 연구에서는 수학과 독서를 활용한 수학 수업이 학생들에게 정의적으로 어떠한 영향을 미치는지 탐구하였다. 중학교 2학년 100명의 남학생을 대상으로 정의적 특성요소로 흥미, 자신감, 가치인식, 자기조절력, 수학 불안 5개 요인을 조사해보고, 상 중 하 수준별 학생들에게 수학과 독서수업이 미치는 영향을 탐구하였다. 또 사전 사후 검사 결과와 학생의 인터뷰를 통해 바람직한 독서를 활용한 수업 방안을 모색하였다.

• Wind and Structures
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• 제35권4호
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• pp.229-242
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• 2022

Wind tunnel test is often adopted to assess the site-specific wind characteristics for the design of bridges as suggested by current design standards. To investigate the wind characteristics of flat and mountainous terrain, two topographic models are tested in a boundary layer wind tunnel. The wind characteristics, including the vertical and horizontal mean wind speed distributions, the turbulence intensity, and the wind power spectra, are presented. They are investigated intensively in present study with the discussions on the effect of wind direction and the effect of topography. It is indicated that for flat terrain, the wind direction has negligible effect on the wind characteristics, however, the assumption of a homogenous wind field for the mountainous terrain is not applicable. Further, the non-homogeneous wind field can be defined based on a proposed approach if the wind tunnel test or on-site measurement is performed. The calculated turbulence intensities and wind power spectra by using the measured wind speeds are also given. It is shown that for the mountainous terrain, engineers should take into account the variability of the wind characteristics for design considerations.