• Communications of Mathematical Education
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• v.28 no.4
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• pp.457-474
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• 2014

Recently, with the development of technology, intuitive understanding of abstract mathematical concepts through visualizations is growing in popularity within college mathematics. In this study, we introduce free visualization tools developed for better understanding of topics which students learn in Calculus. We visualize important concepts of Calculus as much as we can according to the order of most Calculus textbooks. In this process, we utilized a well-known, free mathematical software called GeoGebra. Finally, we discuss our experience with visualizations in Calculus using GeoGebra in our class and discuss how it can be effectively adopted to other university math classes and high school math education.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.3
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• pp.74-85
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• 2021

Global Navigation Satellite System (GNSS) receivers are intrinsically vulnerable to radio frequency jamming signals due to the fundamental property of radio navigation systems. A GNSS jamming monitoring system that is capable of jamming detection, classification and localization is essential for infrastructure for autonomous driving systems. For these 3 functionalities, a GNSS jamming monitoring network consisting of a multiple of low-cost GNSS receivers distributed in a certain area is needed, and the precise time synchronizaion between multiple independent GNSS receivers in the network is an essential element. This paper presents a precise time synchronization method based on the direct use of Time Difference of Arrival (TDOA) technique in signal domain. A block interpolation method is additionally incorporated into the method in order to maintain the precision of time synchronization even with the relatively low sampling rate of the received signals for computational efficiency. The feasibility of the proposed approach is verified in the numerical simualtions.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8
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• pp.2349-2360
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• 2000

In medical image processing, if new technologies arc developed, they arc applied to real clinical cases. The results are to be analyzed by doctors to improve the new technologies. So, it is important for doctors to have a tool that helps the doctors in applying the new technologies to clinical cases and analyzing the clinical results. In this paper, we design and implement a visual programming environment where non-programming experts, such as medical doctors, can easily compose a medical image processing application program. A set of image processing functions are implemented and represented as icons. Thc user selects functions by clicking correslxmding icons. The users can easily find necessary' functions from the visualized library. A user selects a function from the visualized library and [Jut the function node into a canvas of Visual Programming Interface. The user connects nodes to compose a dataflow diagram. The connected dataflow diagram shows the now of the program. Hyperbolic Tree is helpful in visualizing a set of function icons in a single screen because it provides both the whole stmcture of the function Iihrary and the details of the focused functions at the same time. We also developed a CUI builder where the user interfaces of the medical image processing applications are composed. Therefore. non'programming experts such as physicians can apply new medical image processing algorithms to clinical cases without performing complex computer programming procedures.

• Korean Journal of Environment and Ecology
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• v.21 no.2
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• pp.134-140
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• 2007

The purpose of this study is to investigate the landscape image and visual preference for ridges of the Seongpanak district at Mt. Hallasan. For this, the evaluation of the artificial and natural landscape is compared through the medium of color slides. Data is analyzed through the descriptive statistics and spatial image is analyzed by factor analysis algorithm. Principle component analysis and Varimax Method are applied to extraction and factor rotation respectively. The results of this study can be summarized as follows : General visual imagesthe Seongpanak district at Mt. Hallasan are clean, beautiful and attractive. The degree of visual preference increased commensurately with the lower rate of artificial factors. Landscape Factors covering the spatial image are found to be 'aesthetic value', 'spatial scale', 'natural quality', and 'topography' factor, which account for 57.6% of the total variants. The aesthetic value variable is the most important factor in visual preference and the unnatural factors are found to present negative elements with visual preference.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.05a
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• pp.42-47
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• 2001

가상현실 기술은 이제 컴퓨터가 생성한 환경과 사용자간의 자유로운 상호작용을 수행할 수 있도록 하는 것이 중요하게 되었다. 이러한 상호작용을 위해서는 시각 제시기뿐만 아니라 사용자가 가상환경에서 물리적인 힘을 느낄 수 있도록 하는 것이 중요하다. 본 논문은 가상환경에서 사용자에게 운동감을 제시할 수 있는 기기들의 소프트웨어적인 아키텍처를 제안하고, 또한 이러한 기기들을 연결하는 데 있어서 가상환경과 통합될 수 있도록 가상환경 서보와 힘 피드백 제시기간의 통신규약을 제시한다.

• Journal of the Korean Geographical Society
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• v.51 no.6
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• pp.853-871
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• 2016

The interest in the prevention of sex crimes and social secure is growing as the number of cases by sexual offences becomes higher. Although various punishable ways have been introduced so far, increasing sex crime is still going on. Thus, effectiveness of legal systems for preventing crimes is questionable. More recently, the approach for environmental criminology has been paid attention for reducing criminal opportunities through environmental design and management of crimes. This study attempts to look over the spatial distribution of sexual crimes in the context of environmental criminology, and examine the correlation between regional environmental factors and the occurrence of sexual crimes empirically. To do this, we visualized the map for sex crimes at the macro-scale and explored the spatial distribution of sexual crimes and spatial clusters based on various spatial statistics using sex crime data published online by the ministry of gender equality and family. Also, we derived the environmental characteristics of sexual crimes by multivariate regression analysis on a large number of explanatory variables of regional environment. Our results will help to understand the current situation and spatial aspects of sex crimes in the nation more realistically. Further, it is respected that our results might be useful basic information for establishing regional policies and plans for the prevention of the sexual crime and enhanced public policing.

• 한국벤처창업학회:학술대회논문집
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• 2017.11a
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• pp.127-131
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• 2017

본 논문은 EU의 TEPSIE 연구에서 정의한 사회혁신 생태계를 분석틀로 활용하여 한국 사회혁신 생태계의 현황을 살펴보고 발전방안을 제시하고 있다. TEPSIE가 정의한 사회혁신 생태계는 전사회적인 차원에서 '사회혁신'의 요소들을 담아냄으로써, 사회적 경제와 연관하여 사회적 기업을 논의하는 과정에서 다소 협소할 수 있었던 시각을 확장하여 구조적 환경과, 자원, 파트너쉽 등을 포괄하는 분석틀을 제공한다. 본 논문에서는 사회혁신기업을 둘러싼 구조적 조건, 수요와 공급 차원에서의 관련 요소들, 그리고 중간지원조직을 중심으로 핵심적인 내용을 분석적으로 담아내고, 이를 바탕으로 사회혁신 생태계의 발전 방안을 제시하였다.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.405-406
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• 2011

현재 일부 전자책은 전통적 책의 인터페이스를 매개하여 사용자 경험을 복제하고 있다. 그러나 새로운 개발환경에서 근대의 시각경험이었던 파노라마, 디오라마와 같은 재현의 수용은 앞으로의 새로운 전자책이 새로운 사용자 경험을 만들어 나갈 것으로 예측하게 한다.

• Korea Petroleum Association Journal
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• s.305
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• pp.22-25
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• 2017

계란을 한 바구니에 담지 않는 것은 그만큼 위험 분산의 필요성이 크기 때문이다. 에너지 또한 마찬가지다. 특정 에너지 의존도를 높이다 공급 문제가 발생하면 대체하기가 쉽지 않다. 단순히 환경적 시각만으로 연료 사용을 유도하는 것은 연료 다변화 차원에서도 바람직하지 않다. 최근 국내에서 벌어지는 디젤차 논란을 두고 하는 말이다.

• Nuclear industry
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• v.37 no.9
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• pp.117-127
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• 2017

원자력학회 소통위원회는 중립적이고 균형잡힌 시각에서 국민이 원자력을 바르게 이해할 수 있는 환경을 조성하고 또한 원자력 현안에 대한 과학적이고 객관적인 정보를 제공할 수 있도록 여러 가지 콘텐츠를 생산하고 있다. 그 일환으로 제작한 '원자력 묻고 답하기'는 총5편으로 구성되어 있으며, QA 형식으로 원자력 전반에 대해 매우 간결하게 설명하고 있다. 원자력에 대한 이해를 돕고자 이를 연재한다.