• 한국소음진동공학회논문집
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• 제15권10호
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• pp.1131-1136
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• 2005

For the accurate measurement of acoustic properties of a surface, efforts have been made to reduce errors caused by external disturbance. If the reflection coefficient is considered as a transfer function between reflected wane and incident wave, the causality is required between them and the reflection coefficient should be of minimum phase. In this thesis, the minimum phase condition is applied to measure correct reflection coefficient. The reflection coefficient is approximated as a rational function In the Z domain by minimizing the sum square error. Then the minimum phase reflection coefficient is reconstructed using the distribution of poles and zeros of the reflection coefficient model.

• Child Health Nursing Research
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• 제30권3호
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• pp.167-175
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• 2024

Purpose: To measure the level of reflection, this study analyzes diaries written by third-year nursing students before and after the debriefing stage in simulation training. A qualitative study using diary entries from 15 nursing students to explore reflection depth. Methods: Students engaged in simulation training and the debriefing stage, documenting their reflections in diaries. Before and after debriefing, reflections were rated from Level 1 (reflectivity) to Level 7 (theoretical reflectivity). Results: The total number of reflection levels rose significantly from 545 to 829 post-debriefing, enhancing higher-order reflection. The shift signifies a move from superficial to deep reflection, highlighting debriefing's role in fostering critical thinking. Conclusion: The findings underscore the critical role of debriefing in enhancing reflective thinking in nursing education. There is a demonstrated need for further research into the specific elements of debriefing that are most effective at promoting deep reflection. Future studies should conduct comparative analyses of different debriefing methods and approaches across various educational settings. This research could lay the foundation for designing more effective debriefing strategies that foster critical thinking and improve learning outcomes in nursing education.

• 대한한의진단학회지
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• 제19권1호
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• pp.47-54
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• 2015

Objective Wave reflection is an important factor that determines the shape of the pulse wave. The purpose of this study is to compare the conventional method used for estimating the reflection site of pulse with a cardiovascular simulator. Methods: In this study, cardiovascular simulator with one elastic tube was used. The pressure and flow was measured simultaneously at three different points. The measured data were used to the conventional methods to estimate the pulse wave reflection site. The results were compared with the known length which were the distances from the measured points to the end of tube. Results & Conclusions: There is a significant error with the time domain method. While, the reflection site with the frequency domain method was similar to the actual reflection site.

• 한국수산과학회지
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• 제20권4호
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• pp.370-378
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• 1987

Wave reflection control functions of mound for the foundation of composite and perforated break-waters were investigated through the theoretical considerations. The theory developed is based on a simple summation of components of reflected waves. The applicability of the theory is assured by the comparative studies of the theoretical calculation and experimental data on the sea surface elevation in front of a breakwater. It is found that the reflection is mainly controlled by depth and width of the mound. In the design of composite type perforated breakwaters, the width of perforated part of the upright section can be decreased to less than half of the conventional design width for the same reflection by using the reflection control function of mound part and the reflection can be reduced until less than $30\%$ of that in the composite breakwaters. Using the results, a design method of mounds is proposed, by which the reduction of wave reflection is assured under the given wave conditions.

• 한국초등과학교육학회지:초등과학교육
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• 제31권3호
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• pp.372-385
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• 2012

For decades, reflection has been recognised as a meaningful tool to bring forth teachers' ownership as well as knowledge and action empowerment in teacher education. Yet there have been few studies on elementary teachers' reflection on their science teaching in Korea. In this study, 71 reflective journals of 24 elementary teachers on their science teaching were analyzed. The characteristics of reflective journals were analyzed in terms of 'productive reflection', a concept suggested by Davis (2006). Unproductive reflection is mainly descriptive without analysis, whereas productive reflection can promote teachers' learning by integrating four aspects of teaching (learner/learning, subject matter knowledge, instruction and assessment). The result showed what elementary teachers consider and emphasize and how they integrate their ideas. Most of reflective journals included aspects of 'instruction', 'learner/learning', and 'subject matter knowledge'. However 'instruction' was emphasized most frequently (69.0%) than 'subject matter knowledge' (33.8%) and 'learner/learning' (26.8%). 'Assessment' was hardly included nor emphasized. More than half of the journals (56.3%) showed no integrations, which were unproductive reflection. A third of the journals (32.4%) integrated only two aspects among four. Average score of integrations was 1.6 on a scale of 4 points. The integrations were not affected by the length of reflective journals and the teaching experience. These findings suggest that productive reflection would not increase naturally with teaching experience and there needs more tactful guidance to develop elementary teachers' productive reflection on their science teaching.

• 한국초등과학교육학회지:초등과학교육
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• 제32권2호
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• pp.113-126
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• 2013

In this study, the researcher aimed to increase productive reflection of pre-service elementary teachers through reflective journal writing and discussion after science peer teaching practice. 'Productive reflection' involves consideration and analysis of interrelationships among aspects of teaching including learners and learning, subject matter knowledge, assessment, and instruction. During 8 week efforts, productive reflection has increased gradually in both individual journal and class discussion. However half of individual journals didn't show productive reflection even in the final stage. This implicated that development of reflective thinking is an achievable but progressive change. By describing the progress in discussion and participants' responses on journal writing and discussion activity, this study shed light on practical ways of enhancing reflective teacher education.

• 한국컴퓨터그래픽스학회논문지
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• 제20권1호
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• pp.13-19
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• 2014

본 논문에서는 현실감 있는 렌더링을 위하여 최근 널리 사용되고 있는 영상 기반 조명(image-based lighting)과정을 실시간으로 처리하기위한 기술을 다룬다. 기존의 영상을 광원으로 사용하는 실시간 렌더링 기법에서는 주로 난반사(diffuse reflection)와 거울 면 정반사(mirror-like specular reflection)을 다루는 반면, 본 논문에서는 기존에 컴퓨터 그래픽스 분야에서 널리 사용하던 퐁 반사 모델(Phong reflection model)을 실시간으로 렌더링 하기 위한 방법을 제안한다. 특히 새로운 방법론 보다는 기존의 방법들을 확장하여 게임이나 실시간 미리보기 등의 응용에서 전통적인 방법으로 제작된 표면 속성을 가지는 기하객체를 보다 사실적으로 렌더링하기 위한 실용적인 방법을 제안한다. 난반사의 경우에는 기존의 방법과 유사하게 전처리 과정에서 원본 광원 영상으로부터 난반사를 실시간으로 계산하기 위한 영상을 생성하는 방법을 사용한다. 정반사의 경우에도 유사하게 전처리 과정에서 광택도(shininess)에 따른 반사 맵을 미리 생성하고 이를 물체의 광택도(shininess)에 따라서 보간하는 방법을 사용한다. 이와 같은 방법으로 실시간에 비교적 매우 적은 양의 계산과 적은 텍스처 참조를 통하여 영상 기반 조명을 근사할 수 있다.

• 문화기술의 융합
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• 제9권6호
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• pp.105-111
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• 2023

본 연구의 목적은 『논어』속 공자의 어록 중 자아성찰, 관계의 성찰, 감사와 행복의 성찰, 사회적 성찰은 시대에 따라 다양하게 재해석되며 오늘날에는 어떤 의미를 내포하고 있는지 알아보는 것이다. 자아성찰은 자신의 정체성과 가치, 감정, 생각과 행동에 대해 고찰하는 과정이다. 자신의 문제점을 파악하고 과오를 인정하고, 개선의 기회를 찾아 미래의 방향을 설정할 수 있기에 인간은 성찰을 통하여 성장한다. 공자는 자신의 삶을 끊임없이 성찰하며 성장하는 인격체로서 군자의 삶을 지향하였다. 위에서 제시한 4가지로 분류하여 살펴보았다. 생성형 AI와 공존하는 시대 공자의 성찰적 삶과 가르침은 현대 사회에서 인간 중심적 가치지향, 성숙한 인간관계, 지속적인 사회적 가치실현 면에서 중요한 가치로 인식되며 행복에 대한 성찰은 최선의 삶의 태도이다.

• 한국음향학회지
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• 제28권3호
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• pp.174-186
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• 2009

경계면이 존재하는 해양에서의 수중 음파 전달 모델링 시 일반적으로 평평한 경계면을 가정하고 Rayleigh가 제안했던 반사계수를 이용해 반사파를 계산할 수 있다. 하지만 해수면이나 해저면과 같은 실제 해양의 경계면은 불규칙적인 거칠기를 가진다. 이러한 경계면에서의 반사 손실은 실험식이나 산란 이론에 기반한 간섭 반사 계수를 계산하여 구할 수 있다. 본 논문에서는 섭동 이론, Kirchhoff 근사법, 작은 가지 근사법과 같은 산란 이론을 이용하여 유체-유체 경계면에 대한 간섭 반사 계수를 각각 유도한다. 이를 이용하여 임의의 거칠기를 가지는 해수면과 해저면에 대한 각 산란 이론의 간섭 반사계수를 계산하며, 이 결과를 Rayleigh 반사 계수와 비교하여 경계면의 거칠기에 따른 반사 손실을 분석한다. 또한, 섭동 이론과 Kirchhoff 근사법의 결과를 일반적으로 적용 범위가 넓은 작은 기울기 근사법의 결과와 비교하여 각 이론의 유효범위에 대해 고찰한다.

• 한국주거학회논문집
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• 제24권6호
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• pp.33-40
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• 2013

Hiroshi Hara is one of the most famous architect in the history of contemporary Japanese architecture. During the 1970's beginning with the Awazu Residence (1972), he designed a series of symmetrical houses, the so called 'Reflection House'. All the houses in this period were based on the method of 'reflection' and 'inversion', which means a radical reversal of the accepted notion that houses are parts of cities. A concept of "A house within a house" is expanded to "A city within a house". The important spatial characteristics of 'Reflection House' are main internal core and valley-like spaces forming internal urban streets by bringing natural elements and the components of streetscape such as plaza, open space, context of street facades and so on. This procedure is called as embedding 'city' into 'house', Hara mentioned. This paper investigates the outline of the 'Reflection House' and analyses the completed works of housing that were based on the theory. Then in the final part of the paper, the implications of 'Reflection House' and its influence on his later works of following period will be discussed.