• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.78-83
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• 2000

본 논문은 영광 1호기 원자력발전소를 기준발전소로 하여 개발된 PRE-MARK 소개 및 PRE-MARK을 기반으로 개발된 노심모델의 결과를 제시하고자 하는 것을 주된 목적으로 하고 있다. 노심 모델개발에는 REMARK 모델 프로그램을 기반으로 개발된 PRE-MARK를 이용하였으며, PRE-MARK의 주요 특징으로는 노심모델 입력자료를 노심설계코드 및 Lattice코드로부터 자동으로 생성하며 GUI 기반으로 변경된 REMARK으로 입력하여 노심모델을 구동함과 동시에 실시간으로 중요 변수의 현재 값들을 그래프로 도시해줌으로 조율 (Tuning) 상수를 용이하게 결정할 수 있도록 하는 것이다 또한 BOL 및 EOL에서 HFP 평형 Xenon 조건에서의 제어봉 위치에 따른 제어봉가(Rod worth)를 영광 1호기 12주기 NDR(Nuclear Design Report)과 비교하고, 원자로정지 이후 BOL, MOL 및 EOL에서의 시간에 따른 Xenon의 반응도 영향을 비교함으로 개발된 모델의 건전성을 입증하였다.

• Journal of Science Education
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• v.35 no.1
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• pp.48-58
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• 2011

This study was performed to develop a model for mentorship education in the science education institute for the gifted. Existing mentorship education models were focused on R&E, which involved science high school students as research participants. For this purpose, a new model was proposed with comparatively definite stages and terms, and based on the theoretical background concerning science inquiry abilities and scientific creativities or the mentorship education in the science education institute for the gifted. Existing mentorship models for science-gifted students were analyzed and compared with the scientific inquiry process and science paper form. A science paper form consisting of four stages was selected. A new model was constructed consisting of six stages, and this model was modified to be made fit for application to students in the physics mentorship course at the science education institute for the gifted in K National University. Good points and improvable points of the model through the application were identified, and the model was modified accordingly. In conclusion, a new model was proposed as a mentorship model for science-gifted students. This model was constructed using the PREPARATION-INTRODUCTION-METHOD-RESULT-CONCLUSION-FINISH format.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.836-842
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• 2006

3D 애니메이션 제작에서 동작의 타이밍(예를 들면 timing&spacing, slow-in, slow-out)은 연기의 의미와 느낌을 정확히 표현하기 위한 매우 중요한 요소 중의 하나이다. 따라서 이러한 타이밍의 편집은 애니메이션 작업에서 필수적이라고 할 수 있는데, 이를 기존의 3D 애니메이션 시스템에서 수행하기에는 기술적으로 많은 어려움이 있었다. 첫째로 타이밍의 편집은 시간축 자체를 변형하는 문제이기 때문에 보간 곡선에 대한 재매개변수화가 필요한데, 이러한 가능은 기존 애니메이션 시스템에서 제공되지 않는다. 둘째로 타이밍 편집에는 종종 애니메이션 감독이 직접 참여하기도 하는데, 일반적으로 3D 애니메이션 시스템의 사용에 익숙하지 않기 때문에 원하는 결과를 직접 만들어 보기가 어려웠다. 본 논문에서는 이러한 문제들을 해결한 새로운 애니메이션 타이밍 시스템을 구현하였다. 이 시스템은 렌더링된 영상파일들과 애니메이션 장면 파일을 입력 받아 사용자가 타이밍 편집을 하고, 그 결과를 애니메이션 장면 파일에 다시 기록하는 방식으로 구현된다. 타이밍 편집은 기존 셀 애니메이션 제작 방식과 유사한 방식으로 프레임을 삽입하거나 삭제하는 가능과 시간왜곡 (time-warping) 그래프를 직접 조정하여 타이밍을 조정하는 가능을 제공한다. 전자는 제작도구에 익숙하지 않은 감독이나 셀 애니메이션 작업자들이 직관적으로 사용할 수 있는 기능이고, 후자는 좀 더 세밀한 타이밍 조정을 위해 제공하는 가능이다. 사용자가 편집한 타이밍 결과는 각 동작변수의 보간곡선을 재매개변수화하여 애니메이션 파일에 기록된다. 본 논문에서 구현한 시스템은 실제 애니메이션 제작에 보편적으로 사용되는 마야 애니메이션 파일을 지원하도록 구현되었다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.3
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• pp.220-224
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• 2017

In this paper, a method of feeding for the near field beam scanning array antenna with three dimensional focal point has been studied. The conventional array antenna theory is mostly about the far field points. The basic idea is to feed the transmitted signal so that it is in phase at the desired point. In this study, a method is proposed to compensate the phase to have the maximum received power at the point where the measurement point distance is near to the array antenna size. In the proposed method, 11 point source antennas are arrayed in three ways in free space. And the contour map is plotted by calculating the radiation patterns in the three dimensional space and the received signal intensities in the plane within the near space. As a result, it was confirmed that 3 dimensional beam scanning is possible also in the near field of the array antenna.

• Journal of the Korean Society for Railway
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• v.13 no.1
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• pp.37-43
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• 2010

Catenary (Overhead Contact Lines) and Pantograph are used to transmit electrical energy to electric railways. An Arc occurs by unstable contact between catenary and pantograph during electric railways operation, which causes malfunctioning or even an accident. Therefore, to prevent a arc or electric contact loss are required arc detection systems with catenary maintenance capability. This paper describes developing of catenary arc detection system using photo detector in order to detect arc incidence in a indirect way. This developed system can also achieve Video-recordings and environmental conditions such as wire voltage/current, pantograph height, speed, position of electric railways, and temperature/humidity. This system have been evaluated at the section that bounds for dongdaegu from seoul. From the experimental results, the occurrence of arc and intensity of arc are mainly effected by wire voltage/current, pantograph height and speed of electric railways.

• The Journal of Korean Association of Computer Education
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• v.15 no.2
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• pp.75-81
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• 2012

As the number of web users is increasing, the leakage of personal information is increasing. If some personal information is leaked, the victim can suffer from material damage or mental damage at the same time. Most of the leakages are result from the people who works for the personal information by accident or design. Hence, the Ministry of Public Administration and Security proposeed the measuring index and enumerates the details. The index is used in a system to check protection of a personal information. However, because this system is used to evaluate after the leakage, it cannot be used to construct some security system or programming a security system. To solve this problem, it needs to express the diversity of items and be able to count what assessors want to count. Thus, a summary sheet which displays the result of the tool will be presented in a radial form graph. Details will be presented as a bar graph. Therefore, it will be proposed that the tool can grasp the weak point and propose the direction of security.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.6
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• pp.244-257
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• 2017

Traffic congestion occurs from drivers' human factors such as driver reaction time, reckless lane change, and inexperienced driving. When Automated Vehicles are introduced, human factors are excluded, resulting in increased average vehicle speed, stabilizing traffic flow, and increasing road capacity. This study analyzed traffic flow changes through traffic volume-speed-density plots, and increased road capacity due to Automated Vehicles. As a result of the analysis, when rate of automated vehicles gests higher, the traffic flow became stable. Additionally, it was analyzed that when all vehicles were automated, the road capacity increased by about 120 %. It is expected that there will be a positive expectation in terms of traffic congestion and traffic demand management due to the introduction of Automated Vehicles.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.12
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• pp.1520-1527
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• 2019

Superpixel methods are widely used in the preprocessing stage as a method to reduce computational complexity by simplifying images while maintaining the characteristics of images in the field of computer vision. It is common to generate superpixels with a regular size and form based on the pixel values rather than considering the characteristics of the image. In this paper, we propose a method to generate superpixels considering the characteristics of an image according to the application. The proposed method consists of two steps, and the first step is to oversegment an image so that the boundary information of the image is well preserved. In the second step, superpixels are merged based on similarity to produce the desired number of superpixels, where the form of superpixels are controlled by limiting the maximum size of superpixels. Experimental results show that the proposed method preserves the boundaries of an image more accurately than the existing method.

• 대한공업교육학회지
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• v.38 no.1
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• pp.49-67
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• 2013

The purpose of this study is to analyze the external systems and the units 'problem solving and invention' of the middle school technology and home economics 1 textbooks of the revised 2011 national curriculum in an effort to provide some information on the content system of invention education in technology class, as invention education was provided as part of a regular subject for the first time. The findings of the study were as follows: First, 'Technology and Inventions' chapter of Technology and Home Economics 1 Textbooks occupied 10-18% share, with the subchapter of 'Problem Solving and Invention' unit taking up 6.7-29% of the textbooks. Second, for most textbooks, 'Technological Problem Solving', 'Idea Generation' 'Multi-dimensional Projection Method', 'Expansive Thought-Processing Methodology', 'Converging Thought Methodology' and 'Invention in Everyday Lives' were included as main contents based on the accomplishment criteria presented in education process interpretation documents. Third, the detailed structures were generally made up as follows: Introduction (Broad Chapter Title, Subchapter Table of Contents, Introduction, Subchapter Title, Study Objectives, Open Thinking); Development (Unit Title, Thinking Ahead, Core Terms, Main Text, Study Helper, Activities, Research Exercises, Supplemental Readings, In-depth Study Topics, Technology in Everyday Lives, Reading Topics, Discussion Topics, and Career Helpers); and Summary (Subchapter Summary, Study Summary, Terms Summary, Writing Follow-up, Self Review, Broad Chapter Evaluation). Fourth, based on the analysis of figures included, photographs had the largest share, followed by figures, tables, and graphs. The photos were used to illustrate various inventions, invention methodologies, and exercise activities, while figures were included to depict the contents included in the main text, and the tables to assist to preparation of process diagrams or materials lists. Fifth, based on the analysis of content weights, greater weights were placed on 'Inventions and Thoughts', and 'Invention Experiment Activities,' while 'Understanding Inventions' and 'Invention and Patents' chapters did not have a lot of texts involved. Sixth, based on the analysis of content presentation methods, most textbooks combined figures, tables, illustrations and texts to discuss the topics. Based on the above study results, we suggest the following: First, a consistent education curriculum should be developed over the topic of invention; and second, more precise and systematic analysis of textbooks would need to be performed.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.2
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• pp.16-27
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• 2011

Embryo is a very early stage of the development of multicellular organism such as animals and plants. It is an important research target for studying ontogeny because the fundamental body system of multicellular organism is determined during an embryo state. Researchers in the developmental biology have a large volume of embryo image databases for studying embryos and they frequently search for an embryo image efficiently from those databases. Thus, it is crucial to organize databases for their efficient search. Hierarchical clustering methods have been widely used for database organization. However, most of previous algorithms tend to produce a highly skewed tree as a result of clustering because they do not simultaneously consider both the size of a cluster and the number of objects within the cluster. The skewed tree requires much time to be traversed in users' search process. In this paper, we propose a method that effectively organizes a large volume of embryo image data in a balanced tree structure. We first represent embryo image data as a similarity-based graph. Next, we identify clusters by performing a graph partitioning algorithm repeatedly. We check constantly the size of a cluster and the number of objects, and partition clusters whose size is too large or whose number of objects is too high, which prevents clusters from growing too large or having too many objects. We show the superiority of the proposed method by extensive experiments. Moreover, we implement the visualization tool to help users quickly and easily navigate the embryo image database.