• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.11a
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• pp.151-154
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• 2020

뉴럴넷 기술이 발전과 힘께 다양한 분야에서 획기적인 성능 향상이 이루어지고 있다. 이미지 압축 분야에서도 기존의 전통적인 툴 제인 구조의 압축 방식에서 벗어나 종단간(end-to-end) 뉴렬넷 기반의 이미지 압축 기술에 대한 연구가 활발히 이루어지고 있다. 특히 최근 네트워크를 통해 변환된 피쳐 데이터의 엔트로피를 최소화하는 방식에 대한 연구가 활발히 이루어지고 있으며, 이에 기반한 최근의 연구는 VVC 화면 내 코딩 기술보다 우수한 코딩 효율성을 제공하고 있다. 그러나 변환된 피쳐 데이터에 대한 특성 분석은 부족한 실정이며, 이에 본 논문에서는 엔트로피 최소화 기반 종단간 이미지 압축 네트워크의 피쳐 공간 데이터에 대한 공간적 (spatial) 상관관계와 채널간(inter-channel) 상관관계(correlation)를 분석하고, 나아가 최근 제안된 종단간 이미지 압축 네트워크의 문맥 기반 예측 기능을 통해 잔존하는 데이터 중복성이 효과적으로 제거됨을 보인다.

• The Mathematical Education
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• v.61 no.1
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• pp.127-156
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• 2022

This study used the data of students from the 6th grade to the 3rd grade of middle schoolin the Korean Educational Longitudinal Study 2013 and classified them into subgroups with similar longitudinal changes in math academic achievement. In addition, the influence of longitudinal changes in the group's academic self-concept and teachers and parents academic support on the longitudinal changes in math academic achievement were analyzed, either directly or indirectly. As a result of the analysis, it was found that the academic self-concept of each group had a positive influence on the academic achievement in mathematics. In addition, the academic support of teachers and parents was found to have a positive influence on the academic achievement in mathematics through the mediating of the academic self-concept. In terms of direct and indirect influence on academic self-concept and math vertical scale scores, it was found that teachers' academic support had more influence than parents' academic support. The educational implications of these points were discussed.

• Journal of The Korean Association of Information Education
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• v.23 no.6
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• pp.551-560
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• 2019

In the advanced information age, learning is an activity in which learners access information resources through computers and Internet to acquire and evaluate information on their own. The emergence of an online learning platform based on the fourth industrial revolution technology is developing into an environment in which elementary and secondary learners learn and study based on constructivism learning theory. In the online learning environment, the researches on the information retrieval ability of the elementary and secondary learners and the self-directed learning ability were found to be highly related. However, it is necessary to analyze the relation between information retrieval ability and self-directed learning ability through a cross-sectional study that is limited to specific curriculum and contents and expands the longitudinal research. In this study, the panel data of the Seoul Education Longitudinal Study collected over 8 years are used to find the difference in self-directed learning ability according to the longitudinal pattern of information retrieval ability and frequency.

• Journal of the Korea Convergence Society
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• v.10 no.8
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• pp.137-144
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• 2019

This paper deals with the longitudinal study on the supply & demand-side diversity of digital media service. The purpose of this study is to measure the diversity of contents supply and demand-side of digital media platform providers by longitudinal data and discuss the implication. In the approval and re-authorization of pay-TV broadcasters, there were attempts to measure diversity indicators as items to evaluate the publicness and public interest of broadcasting, but they are mainly limited to the method of measuring diversity in the short-term supply side. Thus researcher wants to confirm the evaluation of two aspects through this study. First, researcher proposes a demand-side measurement methodology that utilizes actual audience data from users, and second, a longitudinal evaluation methodology that evaluates long-term trends of diversity change. Researcher has secured the actual supply and demand data of the platform player and confirmed trends of longitudinal diversification indexing for 50 months from 2012 to 2017. Through this research, researcher expects that the supply and demand-side and the longitudinal diversity evaluation will be utilized in a balanced way of publicness and public interest evaluation of broadcasting.

• Korean Journal of Culture and Social Issue
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• v.29 no.2
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• pp.223-252
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• 2023

The aim of this study is to examine the longitudinal mediation effect of coping strategies(emotion-focused, problem-focused, and maladaptive) on the relationship between perceived stress during the COVID-19 andemic and psychological distress(negative affect, depression, anxiety, and anger). ). Also, This study sought to find generational differences between coping strategies used during the COVID-19 pandemic. The participants were 941 adult aged between twenties and seventies. The final participants were recruited on two separated longitudinal time points, Time 1 and Time 2. The result were as follows: Only Maladaptive coping strategy(Time 2) had a mediating effect on the relationship between COVID-19 stress(Time 1) and psychological distress(Time 2). . The result of the generation-based multi-group analysis did not yield significant differences in the use of coping strategies. This study is meaningful that it longitudinally examined the psychological distress of adults during the COVID-19 pandemic. Implications, limitations and directions for future research are presented.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.6
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• pp.498-508
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• 1991

This thesis presents a performance analysis algorithm that estimates erro performance of individual links, at the bit level, in an end-to-end digital connection using the model of 3-statte MarKov chain. The link model proposed the burst error behavior of each individual link. It also presents a method to concateante several individual links and extract a model for end-to-end digital connection. This resulting end-to-end model can be used to calculate performance parameters such as bit error rate(BER) and block error(BLER) for any block size.

• Journal of the Korean Geographical Society
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• v.39 no.5 s.104
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• pp.722-734
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• 2004

Longitudinal profiles of bedrock rivers play a fundamental role in landscape history by setting the boundary conditions for landform evolution. Longitudinal profiles are changed with climatic conditions, lithology and tectonic movements. Tectonic movement is an important factor controlling longitudinal profiles, especially in tectonically active area where uplift rates are regarded as a major factor controlling channel gradient. However study on bedrock channel has made little progress, because controls over bedrock river incision are yet to be clarified. Previous numerical simulations have used a simple diffusion model, which links together the overall processes of bedrock channel erosion as in other landform evolution models. In this study, previous bedrock incision models based on physical processes (especially abrasion) are reviewed and new modifications are introduced. Using newly formulated numerical model, the role of spatial pattern and intensity of tectonic uplift on changes in river longitudinal profile was simulated and discussed.

• Journal of the Korean Geographical Society
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• v.49 no.3
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• pp.339-356
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• 2014

Easy access to DEMs and the development of technology treating DEMs make it easier to extract stream longitudinal profiles from DEMs than previously done. Since such profiles possess many problems such as artificial flats and steps, it should be required for them to be smoothed like natural profiles to estimate gradient values along those sections. However smoothing itself comes with much distortion of raw profile from original DEMs. There has been no research evaluating quantitatively the effects due to smoothing process. Here we attempt to quantify the effects of major smoothing methods on raw and real profiles, suggest a new method to overcome the limitations of them, and evaluate it. This study not only suggests a new smoothing method, but also provides a guideline for choosing a proper smoothing method.

• Journal of the Korean Society of School Health
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• v.13 no.1
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• pp.161-169
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• 2000

이 연구에서 우리는 건강 교육 프로그램을 통해서 청소년 건강 복지를 향상시키는 방법을 추구해본다. 흡연, 음주, 약물 남용의 패턴은 전형적으로 틴에이지 시기에 형성되어진다. 청소년들은 다양한 심리 사회적 이유 때문에 substance 사용을 시작한다. 정책 수립자들의 우선 과제는 청소년들을 교육시키는 것이어야한다. 이 연구에서는 청소년 substance 사용 행위가 종단적 관점에서 연구되어진다. 청소년 substance 사용 행위 예방 교육 프로그램으로부터 얻어진 종단 데이터가 이 연구에서 사용되어진다. 건강 교육 프로그램을 도입했던 학교들에서 청소년 substance 사용 행위가 더 작은 율로 중가되는 것이 보여지고, 그 효과성이 검증되어진다.

• Tunnel and Underground Space
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• v.18 no.5
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• pp.338-342
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• 2008

Longitudinal deformation profile(LDP) has been obtained mostly by numerical analysis. In this study, LDP was plotted by measured data from horizontal inclinometer and crown settlement. Deformation of foe ahead was determined by comparing to the maximum deformation point and deformation of after excavation was determined by regression of the measured crown settlement data. The result shows that crown deformation began as f3r as 3D ahead of the face. Crown settlement at the face was 40% of ultimate deformation, which was 10% higher than numerical results, and the deformation converged after excavation of 4D.