• 정보교육학회논문지
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• 제10권1호
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• pp.93-104
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• 2006

이 연구는 선행 연구들이 지적했던 스캐폴딩 제공의 문제점인 학습전이의 저해, 인지부하의 증가, 자율적학습동기의 감소가 스캐폴딩 유형에 따라 어떻게 달라지는지 알아보고자 하였다. 이를 위해 문헌 고찰을 통하여 스캐폴딩에 대한 설계원리를 제시하고, GLAS 유형(지원적, 성찰적, 내재적)에 따른 웹 기반 협력학습환경을 설계하였다. 그리고, 무선적으로 선정된 초등학교 6학년 학생들을 대상으로, 4주간 수학을 주제로 GLAS 유형별 웹 기반 협력학습을 실시하였다. 그 결과, 학습전이에 대한 스캐폴딩의 영향, 성찰적 스캐폴딩의 인지부하 문제, 학습동기에 영향을 주는 내재적 스캐폴딩에 대하여 결론을 얻을 수 있었다.

• 천문학회보
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• 제35권2호
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• pp.73.2-73.2
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• 2010

In order to understand internal dynamics of starless cores, molecular line emissions are usually observed. From profiles of the molecular lines, internal motions of starless cores have been deduced using a simple radiative transfer model such as the two-layer model (Myers et al.1996). This brings complexities arising from the chemical evolution. The motivation of this study is to follow the chemical evolution of a starless core that goes through gravitational contraction. For this purpose, we have performed hydrodynamical simulations with a marginally unstable Bonnor-Ebert sphere as an initial condition. We follow the chemical evolution of this core with changing conditions such as the chemical reaction rate at the dust surface and the strength of radiation field that penetrate into the core. At the core center, the molecules suffer from a higher degree of molecular depletion on the dust covered by ice rather than on the bare silicate dust. The stronger radiation field dissociates more molecules at the core envelope. From analysis on the line profile using the two-layer model, we found that the speed of inward motion deduced from the HCN F = 2-1 line adequately traces the true infall speed, when the dust is covered by ice and the core is exposed to the diffuse interstellar radiation field. Under different conditions, the two-layer model significantly underestimate the infall speed.

• International Journal of Advanced Culture Technology
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• 제6권4호
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• pp.12-19
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• 2018

This article aims to discuss the transition of the Kazakh writing system from Cyrillic to Latin. First, the study investigates the relationship between the Kazakh Cyrillic alphabet and phonology, in order to linguistically evaluate the efficiency of the writing system. Second, the process of determining the Kazakh Latin alphabet is discussed in terms of the Kazakh phonological system. Third, the factors that determined the Latin alphabet of Kazakh language are analyzed. In Kazakh, the phonemic system is subject to controversy among linguists, but it can be said that the phonological system basically follows the one-to-one correspondence to the Russian and Kazakh phonemes. As for the depth of orthographies, Kazakh Cyrillic writing system is not based on the shallow orthographies, so it incorporates morphophonemic information to make skilled readers understand easier. The political and social aspects are considered as a cause of the alphabet change. Although there are studies suggesting the conversion of the writing system is caused by the extrinsic factors rather than the intrinsic factors, the five criteria of Smalley (1964), which compromise the intrinsic and extrinsic factors, are also persuasive. The five factors are 1) Maximum motivation for the learner, 2) Maximum representation of speech, 3) Maximum ease of learning, 4) Maximum transfer, 5) Maximum ease of reproduction.

• 대한방사선기술학회지:방사선기술과학
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• 제35권2호
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• pp.109-117
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• 2012

간접형 CsI flat-panel detector (FPD)의 해상특성(modulation transfer function, MTF), 잡음특성(Wiener spectrum or noise power spectrum, NPS), 양자검출효율(detective quantum efficiency, DQE)을 측정하고 평가하기 위하여 본 실험을 실시하였다. IEC에서 권고한 실험방법을 따라 RQA3, RQA5, RQA7, RQA9의 방사선 선질을 사용하였다. MTF는 egde법을 사용하였다. Wiener spectrum은 조사 영역내에서 획득한 영상의 푸리에 변화를 통하여 구하였다. DQE는 MTF, WS(NPS), X선 입력 및 입력 광자량을 사용하여 평가하였다. 특성곡선은 RQA3와 RQA5, RQA7, RQA9과는 차이가 발생하였다. MTF는 X선 선질과는 상관없이 일정하였다. WS(NPS)은 X선 양이 증가 할수록 감소하였으며, RQA3, RQA5, RQA7, RQA9순으로 감소하였다. DQE는 1mR에서 가장 우수했으며, RQA3, RQA5, RQA7, RQA9순으로 감소하였다. FPD의 물리적 영상 특성을 입력 선질에 따라 다를 수 있다. 본 연구를 통하여 디지털 방사선 시스템의 바르게 사용하려면 FPD의 물리적 영상 특성을 아는 것이 중요함을 인식하게 되었다.

• 대한의용생체공학회:의공학회지
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• 제28권6호
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• pp.756-767
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• 2007

For the combination of phosphor screens having various thicknesses and a photodiode array manufactured by complementary metal-oxide-semiconductor (CMOS) process, we report the observation of image-quality degradation under the irradiation of 45-kVp spectrum x rays. The image quality was assessed in terms of dark pixel signal, dynamic range, modulation-transfer function (MTF), noise-power spectrum (NPS), and detective quantum efficiency (DQE). For the accumulation of the absorbed dose, the radiation-induced increase both in dark signal and noise resulted in the gradual reduction in dynamic range. While the MTF was only slightly affected by the total ionizing dose, the noise power in the case of $Min-R^{TM}$ screen, which is the thinnest one among the considered screens in this study, became larger as the total dose was increased. This is caused by incomplete correction of the dark current fixed-pattern noise. In addition, the increase tendency in NPS was independent of the spatial frequency. For the cascaded model analysis, the additional noise source is from direct absorption of x-ray photons. The change in NPS with respect to the total dose degrades the DQE. However, with carefully updated and applied correction, we can overcome the detrimental effects of increased dark current on NPS and DQE. This study gives an initial motivation that the periodic monitoring of the image-quality degradation is an important issue for the long-term and healthy use of digital x-ray imaging detectors.

• 한국실내디자인학회논문집
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• 제22권4호
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• pp.70-77
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• 2013

This study has analysed the composition elements in a cafe space where visual transfer-elements are filled and the perceptual characteristics of facade designs with the purpose of drawing any important elements to advertisement and their related items for uniqueness of designs. For the analysis of the perception process shown in the consecutive situations of observing and visiting cafes, the cafe facade was grouped and stereotyped for the analysis of perceptual characteristics and significant composition elements for better designing of cafes through survey with representative facades as subjects. The conclusions from this study are the followings. First, for the uniqueness specific to cafes to be integrated into facade, memory was chosen first as the most significant advertisement factor followed by interest as with male and attention as with female. The memory has much to do with furniture and finishing material of Clause (4), Chapter 4.1 and the types having effects on perception of Clause (1) and the atmosphere having effect on that of Clause (2) were found to be major factors to attention and interest. Second, it was found out that women preferred horizontally stable partition and men clearly divided facades. The factor of shape was observed first among the constituents of facade followed by color. There was no difference with 'shape' between men and women and color was found to be a space constituent having a lot of effects on women. Third, the memory of experience from visiting a cafe was very likely to offer the motivation of visiting it again, on which furniture had the most effect followed by finishing material and color. Such elevation elements as facade and logo were found not to have effect on the memory or the re-visit. Any intention of visiting again seemed to be influenced by such comprehensive images as atmosphere rather than by any concrete facade, furniture, or appliance. From the above viewpoint, facade design should have any uniqueness or impressive feature as well as the effect of making passers-by drop in and attracting them into the shop. The analysis of attributes of facade constituents revealed that the abstract images in addition to the configuration of facade had much to do with interest or behavior.

• 디지털융복합연구
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• 제16권6호
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• pp.205-212
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• 2018

본 연구에서는 국가 전략적 차원에서 보안 거버넌스를 효율화시키기 위한 새로운 개념의 정보보안 거버넌스 모델 설계 방법을 제안한다. 이를 위해 우리의 운영 경험을 진단하고, 새로운 모델 설계 방법을 도출하였다. 그동안 국가 정보보안 활동은 지식 전달 위주로 인식되었고 활동의 동기 부여와 실행력 확보가 취약하였다. 결과적으로 보안 사각 지대가 늘어나고 대형 보안 사고가 빈발하여 해결이 필요한 과제로 대두되었다. 국가 사이버보안 거버넌스는 국가 리더의 책임하에 상단의 정책에서 하단의 실행까지 총체적으로 시스템화되어야 한다. 본 연구는 이같은 접근 방법에 기반하여 한국형 보안 거버넌스 모델의 종합 프레임워크를 제시하고 이를 비전, 목표, 과정, 수행 등 4개의 아키텍처 설계로 구체화시킴으로써 국가 거버넌스 모델 설계의 기반을 도출하였다. 라이프 사이클 흐름상의 문제점 진단, 환경변화에 기초한 보안 정책, 모든 주체의 참여가 반영되는 새로운 틀에 대하여는 계속적인 연구가 필요하다.

• 산업경영시스템학회지
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• 제41권3호
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• pp.120-128
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• 2018

OLED Display fabrication system is one of the most complicated discrete processing systems in the world. As the glass size grows from $550{\times}650mm$ to $1,500{\times}1,850mm$ in recent years, the efficiency of Automated Material Handling System (AMHS) has become very important and OLED glass manufacturers are trying to improve the overall efficiency of AMHS. Aiming to meet the demand for high efficiency of transportation, various kind of approaches have been applied for improving dispatching rules and facility layout, while simultaneously considering the system parameters such as glass cassettes due date, waiting time, and stocker buffer status. However, these works did not suggest the operational policy and conditions of distribution systems, especially for handling unnecessary material flows such as detour. Based on this motivation, in this paper, we proposed an efficient algorithm for improving detour transportation in OLED FAB. Specifically, we considered an OLED FAB simplifying OLED production environment in a Korean company, where four stockers are constructed for the delivery of Lot in a bay and linked to processing equipments. We developed a simulation model using Automod and performed a numerical experiment using real operational data to test the performance of three operation policies under considerations. We showed that a competitive policy for assigning alternative stocker in case of detour was superior to the current dedicated policy using a specified stocker and other considered policies.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.662-665
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• 2017

최근 산업 환경의 빠른 진화와 발전으로 기업이 필요한 인재상이 변화하고 있다. 이러한 교육 패러다임의 변화에 따라 대학 교육은 기업에 필요한 인재를 양성하기 위해서 강의식 교육방법(기존의 지식 전달 방식)의 문제점을 보완하고 자기 주도적이고 창의적 문제 해결력 향상을 위한 새로운 교수학습 방법이 필요하다. 본 연구에서는 컴퓨터공학과의 전공필수교과목인 알고리즘 수업에서 플립러닝을 적용하여 이론과 실습수업을 병행한 그룹과 플립러닝을 적용하여 이론수업을 진행한 그룹 그리고 전통적인 강의식 기법을 적용한 그룹으로 분류하여 수업을 진행한다. 학습자의 학습 동기부여 및 학업 성취도 향상을 위해 알고리즘 교과목에 적합하도록 플립러닝 교수학습법을 제안하고 수업에 직접 적용한다. 그 결과를 바탕으로 학습자들의 학업성취도 및 학습만족도를 비교분석하고 문제점 및 활용방안을 제시하고자 한다.

• 한국치위생학회지
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• 제18권4호
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• pp.585-595
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• 2018

Objectives: The purposes of this study were to comprehend the subjective dental health status and the level of dental health knowledge in some middle school students and to analyze the correlation with dental health behaviors. Methods: A survey was conducted in some middle school students and the final 637 survey data were analysed. As the statistical analysis methods, the subjective dental health status, dental health knowledge and dental health behaviors according to the general characteristics were analyzed by independent t-test, one way ANOVA and Scheffe. The correlations among the subjective dental health status, dental health knowledge and dental health behavior were found by Pearson's correlation and multiple regression analysis. Results: Through correlation analysis of the subjective dental health status, dental health knowledge and dental health behavior, all showed a significant correlation. As a result of the factor analysis affecting dental behaviors, subjective dental health status was the highest (${\beta}=0.304$, p<0.001). Conclusions: The results of this study suggest that the improvement of subjective dental health status and dental health knowledge related to dental behaviors health in the middle school students should be considered. In addition, dental health education should focus on improving subjective dental health status through motivation rather than knowledge transfer training. Moreover, development programs appropriate for the middle school students whose behavioral changes are hard to obtain are needed.