• 한국지형학회지
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• 제24권3호
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• pp.133-147
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• 2017

This study investigated the cases of relative location, especially focused on the geomorphological situation, for the conceptualization of the location knowledge. In order to perform this study, first of all, I approached meaning of location. In this study I used the terms 'site' and 'situation'. 'Site' as used here means the location of a given place with its local internal features or resources. 'Situation' refers to the location of place as related to other places. As to location, no place exists in isolation. Therefore, it is necessary to look beyond the internal nature of the area itself to perceive its external relations with other areas. The examples of geomorphological situation were focused on the scale linkage of the examples, the interaction between elements of earth surface processes, and the method of comparative region. The regions of examples were the landscape of Mt. Hymalaya to Bengal deep sea fan, the climatical difference of continental east and west, the landscape of Mt. Geum & Sangju beach, the landscape of the south and north face of Mt. Mai., Hamjibaakgol asymmetrical valley, and the landscape of inland sea and outer sea type island.

• The Journal of Asian Finance, Economics and Business
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• 제7권7호
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• pp.475-487
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• 2020

The paper aims to facilitate a discussion around how big data technologies and data from citizens can be used to help public administration, society, and policy-making to improve community's lives. This paper discusses opportunities and challenges of big data strategies for government, society, and policy-making. It employs the presentation of numerous practical examples from different parts of the world, where public-service delivery has seen transformation and where initiatives have been taken forward that have revolutionized the way governments at different levels engage with the citizens, and how governments and civil society have adopted evidence-driven policy-making through innovative and efficient use of big data analytics. The examples include the governments of the United States, China, the United Kingdom, and India, and different levels of government agencies in the public services of fraud detection, financial market analysis, healthcare and public health, government oversight, education, crime fighting, environmental protection, energy exploration, agriculture, weather forecasting, and ecosystem management. The examples also include smart cities in Korea, China, Japan, India, Canada, Singapore, the United Kingdom, and the European Union. This paper makes some recommendations about how big data strategies transform the government and public services to become more citizen-centric, responsive, accountable and transparent.

• 교육시설 논문지
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• 제25권6호
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• pp.11-20
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• 2018

In order to figure out the usability of various timber structures in the educational facility, the recent timber structure examples published in the Japanese architectural magazine, 'ShinKenchiku' over the past five years were surveyed. As the results, timber structures were presented in many cases of nursery schools and kindergartens overwhelmingly, and they also used in various school buildings, university facilities, and the roof structure of the school's gymnasium, with intention of having the differentiated design and space features. The examples show that span 6 to 10m is generally used with flexure structure system and flexure+compression structure system added the strut as compression members. In addition concerning stability, it was founded that the struts have an stability effect in the flexure+compression structure system, and flexure structure system examples using semi-rigid joints have open spaces liberally in two-way direction for about 9m span. For large spaces structures with span of 15~20m or more, the various structural system such as suspension structure, truss, flexure+compression, etc. was designed to overcome the material limitations of timbers and to make an design effect in structure system.

• 한국수학교육학회지시리즈A:수학교육
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• 제57권4호
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• pp.371-391
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• 2018

The purpose of this study is to analyze manifestation examples and effects of group creativity in mathematical modeling and to discuss teaching and learning methods for group creativity. The following two points were examined from the theoretical background. First, we examined the possibility of group activity in mathematical modeling. Second, we examined the meaning and characteristics of group creativity. Six students in the second grade of high school participated in this study in two groups of three each. Mathematical modeling task was "What are your own strategies to prevent or cope with blackouts?". Unit of analysis was the observed types of interaction at each stage of mathematical modeling. Especially, it was confirmed that group creativity can be developed through repetitive occurrences of mutually complementary, conflict-based, metacognitive interactions. The conclusion is as follows. First, examples of mutually complementary interaction, conflict-based interaction, and metacognitive interaction were observed in the real-world inquiry and the factor-finding stage, the simplification stage, and the mathematical model derivation stage, respectively. And the positive effect of group creativity on mathematical modeling were confirmed. Second, example of non interaction was observed, and it was confirmed that there were limitations on students' interaction object and interaction participation, and teacher's failure on appropriate intervention. Third, as teaching learning methods for group creativity, we proposed students' role play and teachers' questioning in the direction of promoting interaction.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.4105-4121
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• 2021

Recently, malware classification based on Deep Neural Networks (DNN) has gained significant attention due to the rise in popularity of artificial intelligence (AI). DNN-based malware classifiers are a novel solution to combat never-before-seen malware families because this approach is able to classify malwares based on structural characteristics rather than requiring particular signatures like traditional malware classifiers. However, these DNN-based classifiers have been found to lack robustness against malwares that are carefully crafted to evade detection. These specially crafted pieces of malware are referred to as adversarial examples. We consider a clever adversary who has a thorough knowledge of DNN-based malware classifiers and will exploit it to generate a crafty malware to fool DNN-based classifiers. In this paper, we propose a DNN-based malware classifier that becomes resilient to these kinds of attacks by exploiting Generative Adversarial Network (GAN) based data augmentation. The experimental results show that the proposed scheme classifies malware, including AEs, with a false positive rate (FPR) of 3.0% and a balanced accuracy of 70.16%. These are respective 26.1% and 18.5% enhancements when compared to a traditional DNN-based classifier that does not exploit GAN.

• 정보보호학회논문지
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• 제33권3호
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• pp.449-458
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• 2023

인공지능은 빅데이터와 딥러닝 기술을 이용해 다양한 분야에서 삶의 편리함을 주고 있다. 하지만, 딥러닝 기술은 적대적 예제에 매우 취약하여 적대적 예제가 분류 모델의 오분류를 유도한다. 본 연구는 StarGAN을 활용해 다양한 적대적 공격을 탐지 및 정화하는 방법을 제안한다. 제안 방법은 Categorical Entropy loss를 추가한 StarGAN 모델에 다양한 공격 방법으로 생성된 적대적 예제를 학습시켜 판별자는 적대적 예제를 탐지하고, 생성자는 적대적 예제를 정화한다. CIFAR-10 데이터셋을 통해 실험한 결과 평균 탐지 성능은 약 68.77%, 평균정화성능은 약 72.20%를 보였으며 정화 및 탐지 성능으로 도출되는 평균 방어 성능은 약 93.11%를 보였다.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제27권2호
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• pp.139-153
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• 2024

본 연구는 초등 수학 교과서와 관련하여 입체도형의 지도와 관련된 교수학적 시사점을 제시하고자 하였다. 국정 1종 및 검정 10종의 교과서를 분석하였으며 각기둥과 각뿔 단원 내 수학적 개념의 정의와 시각적으로 표현된 예시를 분석하였다. 분석 결과, 동일한 교육과정이 반영되었음에도 불구하고 수학적 개념의 정의 방법 및 내용이 다르게 나타났다. 또한, 각기둥과 각뿔을 학습하는 과정에서 다양한 형태로 표현된 시각적 예시가 제공되었다. 본 연구의 결과를 바탕으로 수학적 개념의 정의를 이해하고 학생에게 적절한 방식으로 지도할 필요가 있으며 시각적 예시를 제시하는 과정에서 각 차시의 목표 및 활동의 목표를 고려하여야 한다는 시사점을 도출하였다.

• ALGAE
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• 제26권2호
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• pp.109-140
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• 2011

Taylor's (1960) floristic treatment of the benthic marine algae of the tropical and subtropical western Atlantic and Wynne's (2011) "checklist: third revision" serve as benchmarks in a review of changes made in the past half-century period. There has been a great increase in the number of recognized taxa of red, brown and green algae at all taxonomic ranks: from 758 to 1,393 species, an increase of 84%; from 231 to 406 genera, an increase of 75%; and from 63 to 106 families, an increase of 68%. In regard to recognized infraspecific taxa, the increase was less dramatic, from 140 to 185, thus a 32% change in the 50-year period. This review addresses the question: What factors were responsible for this proliferation of taxa that are now recognized in this domain of the tropical and subtropical western Atlantic? The answer is that many reasons contributed to these changes. Foremost among these causes have been the advances in gene-sequencing technologies. Revised phylogenetic relationships have led to many genera being divided into more than one genus, as well as new families and orders being delineated. Numerous examples of cryptic species have been discovered by gene-sequence and DNA-bar coding studies. This trend is depicted by case studies. Examples of genera being divided are Galaxaura, Liagora and Laurencia. Tricleocarpa and Dichotomaria have been segregated from Galaxaura. Trichogloeopsis, Ganonema, Izziella, Yamadaella, and Titanophycus have been segregated from Liagora. Chondrophycus, Osmundea, Palisada, and Yuzurura have been segregated from Laurencia. Examples are given of other genera present in this region of the western Atlantic that have been split up. Many genera have increased in terms of the number of species now assigned to them. Taylor's (1960) treatment recognized only two species in Hypoglossum, whereas Wynne's (2011) checklist contained a total of 9 species of Hypoglossum. Taylor's account included only two species of Botryocladia, but this number had grown to 15 in Wynne's checklist. Examples of new genera and species occurring in the region of the western Atlantic are given, and examples of taxa being newly reported for this domain are provided. An increase in the number of phycologists in Latin and South America, exploration of previously unexplored regions, and the increasing use of SCUBA for collecting and at greater depths have all contributed to the increase in the number of algal taxa that are now recognized as occurring in the tropical and subtropical western Atlantic.

• 한국콘텐츠학회논문지
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• 제13권8호
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• pp.83-92
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• 2013

텍스트 시각화는 시각적 표현의 재료가 되는 텍스트 자체에 대한 이해에서 시작한다. 임의의 텍스트 데이터를 시각화하기 위해서는 해당 텍스트의 특성에 대한 충분한 이해가 선행되어야하며, 이렇게 도출된 텍스트가 갖는 고유한 특성에 따라 시각화의 목적과 표현적 접근 방법이 결정될 수 있다. 본 연구에서는 동일한 텍스트가 갖는 다양한 특성에 따라 도출된 대표적인 시각화 사례를 분석함으로써 텍스트 시각화에 대한 접근 방식에 대한 이론적 토대를 구축하고자 하였다. 이를 위해 동일 시각화의 대상 텍스트로서 전 세계적으로 가장 널리 알려져 있고, 그 디지털 데이터를 획득하기 용이하며 따라서 텍스트 시각화 사례가 다양하게 존재하는 '성경' 텍스트를 선정하여 사례 분석을 진행하였다. 사례 분석을 위한 기준으로서 텍스트가 갖는 고유한 특성-내용적, 구조적 특성 및 인용정보-를 도출하고, 각 기준에 부합하는 텍스트 시각화 사례들을 2-3가지 이상 선정하여 분석에 대한 타당성을 높였다. 분석결과 성경 텍스트가 갖는 독특한 특성에 따라 시각화의 목표와 표현적 접근법이 결정됨을 파악할 수 있었다. 본 연구를 토대로 향후 더욱 다양한 관점의 사례 분석을 통하여 텍스트 시각화를 위한 재료 선택 및 접근 방법에 대한 이론적 방법론 구축이 가능할 것으로 기대한다.

• 한국과학교육학회지
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• 제38권6호
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• pp.793-812
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• 2018

본 연구는 지식 중심의 과학교육에 대한 비판적 시각으로부터, 과학으로부터 배울 수 있는 지혜가 무엇인지 탐색하고자 하였다. 즉, 과학 과학수업 시간에 공유될 만한 '과학의 지혜'의 범주와 예시를 실제 수업 관찰과 면담을 통해 탐색하여 연구 결과로 제안하고자 하였다. 자료수집을 위해 3개 고등학교의 물리 수업을 관찰하고 교사 면담과 학생 면담을 각각 진행하였다. 수집된 자료는 본 연구에서 규정한 '과학의 지혜'의 의미에 기초하여 질적으로 분석하였다. 본 연구에는 '과학의 지혜'를 "과학지식의 형성 과정과 활용 과정에서 발견할 수 있는 지혜로운 행동, 태도, 방법, 생각 등의 행위"의 의미로 한정하여 사용하였다. 연구 결과, '과학의 지혜'의 3가지 범주와 6개의 예시를 도출하고 이를 연구자의 관점에서 해석 및 논의하였다. 첫 번째 범주는 '과학적 탐구에 필요한 태도'로서의 지혜이며, 이에 해당하는 예시는 '합리적 의심과 개방적 태도' 및 '최선의 대안을 찾는 노력'이다. 두 번째 범주는 '문제 해결에 유용한 방법'으로서의 지혜이며, 이에 해당하는 예시는 '조건을 변화시켜보는 사고방식'과 '과학의 언어를 사용하는 소통방식'이다. 마지막으로 세 번째 범주는 '과학과 인간의 관계에 대한 고찰'로서의 지혜이며, 이에 해당하는 예시는 '과학과 사회의 관계에 대한 이해'와 '과학과 나의 관계에 대한 인식'이다. 결론에서는 미래 과학교육의 대안적 목표로서 '지혜 지향적 과학교육'을 제안하고 그 의미와 시사점에 대해 논의하였다.