• Journal of Science and Technology Studies
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• v.19 no.3
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• pp.119-166
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• 2019

The risk of electromagnetic field(EMF) from power lines has been heavily disputed whenever high-voltage power line towers were built in South Korea. Local communities and civic groups had regarded burying the lines in the ground as an alternative to building power line towers. In 2014, however, when an elementary school science teacher reported the results of EMF measurements over the underground power lines to the Asian Citizens' Center for Environment and Health (ACCEH), the risk controversy over underground power lines took a whole new turn. The level of EMF from underground power lines turned out to be higher, and therefore more harmful than that from power line towers. In the debates that took place from then on over the EMF risk, ACCEH and NIER(National Institute of Environmental Research) presented conflicting topographies of EMF risk. This paper examines measuring practices of ACCEH and NIER by analyzing the measuring sites, measuring devices, and measuring heights chosen by each organization. This paper further examines how ACCEH and NIER mobilized various standards(EMF exposure limit, measurement guideline, categorization of carcinogens) differently. This controversy on the EMF from underground power lines of Seoul has raised concerns on the non-thermal effects of EMF in the long-term exposure and has led people to question whether burying the power lines is the safe alternative to building power line towers. Furthermore, this suggests conflicting answers on whether Seoul, where 90 % of transmission lines were already buried, is a safely managed place or not.

• Journal of Internet Computing and Services
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• v.22 no.6
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• pp.99-113
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• 2021

In these days, as cyberspace has been recognized as the fifth battlefield area following the land, sea, air, and space, attention has been focused on activities that view cyberspace as an operational and mission domain in earnest. Also, in the 21st century, cyber operations based on cyberspace are being developed as a 4th generation warfare method. In such an environment, the success of the operation is determined by the commander's decision. Therefore, in order to increase the rationality and objectivity of such decision-making, it is necessary to systematically establish and select a course of action (COA). In this study, COA is established by using the method of classifying operational elements necessary for cyber operation, and it is intended to suggest a direction for quantitative evaluation of COA. To this end, we propose a method of composing the COES (Cyber Operational Elements Set), which becomes the COA of operation, and classifying the cyber operational elements identified in the target development process based on the 5W1H Method. In addition, by applying the proposed classification method to the cyber operation elements used in the STUXNET attack case, the COES is formed to establish the attack COAs. Finally, after prioritizing the established COA, quantitative evaluation of the policy was performed to select the optimal COA.

• Korean Journal of Optics and Photonics
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• v.11 no.6
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• pp.390-394
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• 2000

An optical system for iris pattern recognition of the human eye is designed. The lens system is triplet type, and characterized to minimize longitudinal chromatic aberration and Petzval sum. The distance from object to image is 200 mm-300 mm and the effective focal length is 50 mm. Performance of the imaging system is assessed by calculating the ray-fan and spot diagram for Fraunhofer C, d and F line for object height 0 mm, 4 mm and 6 mm. Furthermore, MTFs are calculated. All of the spot sizes are less than 0.05 mm in diameter. The MTF values are higher than 0.5 in the spatial frequency range up to 20 lines/mm for all of the object heights. ights.

• Journal of Cadastre & Land InformatiX
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• v.45 no.2
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• pp.175-189
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• 2015

This study analyzed the determinant factors of elderly housing by housing type according to the Financial Retirement plan of preliminary elders and it aimed to draw a future development scheme of elderly housing. This study used parameters of existing research as control variables and it has a meaningful point that the variables of Financial Retirement plan of elders were verified through the research model which this study used. In addition, there was a difference between the detailed models. As a comprehensive analysis result, the Choice Model of elderly housing type has a difference between determinants, the single-family housing and the multi-family housing, based on the Welfare Facility for the Aged from Financial Retirement plan of elders.

• Journal of the Korean earth science society
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• v.31 no.2
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• pp.185-204
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• 2010

Inquiring earth science phenomena is characterized by the followings: a big scale of time and space, inaccessibility, uncontrollability, and complexity. Thus, it is very difficult or, in some cases, impossible to investigate them through the actual manipulation in laboratories. Therefore, it is necessary to provide chance for students to experience scientific inquiry without actual manipulation in earth science classes. This study is to explore the role of reasoning based on a thought experiment as a representative model without actual manipulation, and to investigate features of various inquiry models using reasoning in classes. We can make implications when applying for applying each inquiry model to earth science classes, proposing a reasoning-based inquiry model embedded in earth scientific phenomena.

• The Journal of the Korea Contents Association
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• v.8 no.4
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• pp.117-129
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• 2008

This analysis is intended to approach a computer game in the context of cultural-study theories. The semiotics can be applied to various area, and it is assumed to also applied to computer games. In semiotical background we tried to analyze the mythology of Starcraft mainly by using Propp's narratives theory and Brathes' mythologies theory. In the narratives of Starcraft, we fouind some simplified functions which penetrate the internal structure. And while most of the games having paradigmatic flow in narratives, Starcraft has syntagmatic flow mainly because of the function of network. With these conditions, we could find some mythologies in Starcraft : (1) naturalization of discipline and control, (2) time and space as resources, (3) deprivation of values of object.

• The Bulletin of The Korean Astronomical Society
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• v.35 no.2
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• pp.87.1-87.1
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• 2010

국립고흥청소년우주체험센터는, 우리나라 청소년들에게 우주에서 벌어지는 제반 현상과 천체의 실상을 접하게 하고 또 그 현상과 천체 이면에 자리한 기본 원리를 체험과 실험을 통하여 스스로 터득하게 함으로써 저들을 우주시대를 이끌어갈 창조적 인재로 양성함을 목적으로, 2010년 7월 9일에 개원한 특성화 체험 국립 시설입니다. 우리나라 청소년들이 센터에 설치된 주요 우주체험장비 7종을 활용하여 우주왕복선과 우주정거장에서의 임무수행을 경험하며, 우주왕복선 지상통제센터 요원의 역할 및 우주선이나 항공기의 직접 조종도 체험 할수 있다. 또한 달의 저중력 상황을 체험해 볼 수 있다. 지름 15미터의 천체투영관이 12월 말에 완공될 예정이다. 하늘전망대에는 구경 14인치 광학망원경과 다수의 중소형 망원경들이 설치된다. 또한 우주인 기초체력단련훈련을 할 수 있는 야외 활동 공간을 확보하고 있다. 센터의 우주체험시설과 천문학 관련 시설들은 앞으로 청소년의 우주에 대한 관심을 유발하고 국민들의 과학에 대한 이해를 돕는데 크게 기여할 것으로 기대된다. 현재 4개의 과정으로 우주체험캠프 프로그램을 구성하여 운영하고 있다. 또한, 2009년 개정 지구과학 교육과정과 연계한 우주체험프로그램을 개발 중이다. 여기서는 본 센터의 우주체험시설물 소개와 이들을 활용한 체험활동과 교육 현황 및 계획을 소개하고자 한다.

• Journal of Cadastre & Land InformatiX
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• v.44 no.2
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• pp.193-207
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• 2014

The purpose of this study is the issue of public institutions and the financial metrics improve enforcement, public institutions through an integrated management plan for the research is to increase the efficiency of public finances is the purpose of this study. In this paper, the financial operations of public institutions in the five issues (evaluation index system, financial management control framework, Private/Public Sector management, public finance law/institutions, government budget support management) is presented. Issues and a variety of public agencies on how to improve this, this paper proposes the following. the participation of Congress Control Tower(Public Finance Policy Committee )is installed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.44-46
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• 2018

In this paper, we design a system that can control unmanned mobile objects through communication between unmanned mobile object and control server system using LoRa network which is a dedicated IoT network. It is more efficient when the unmanned mobile object performs the special work by installing the LoRa network applied to the unmanned mobile object control system from the small space house or office hospital to the factory. In this paper, we will discuss the design of a system that can improve the social utilization of unmanned mobile objects by making it possible to communicate the events that occur around other mobile objects from the simplification of the navigation path.

• Proceedings of the Materials Research Society of Korea Conference
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• 2009.05a
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• pp.38.2-38.2
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• 2009

마이크로노즐은 우주공간에서 인공위성의 자세를 바로잡는 데 필요한 마이크로 로켓에 들어가는 필수적인 부품이다. 마이크로 노즐은 또한 나노입자 적층 시스템(nano-particle deposition system, NPDS)에 들어갈 수 있다. NPDS는 세라믹 또는 금속 나노분말 입자를 노즐을 통해 초음속으로 가속시킨 뒤 상온에서 이를 기판에 적층시키는 새로운 시스템이다. 본 연구의 목표는 NPDS에 쓰이는 노즐을 일반적인 반도체 공정을 이용하여 마이크론 스케일의 목을 갖도록 한 마이크로노즐을 제작하는 데 있다. 보쉬 공정은 이러한 마이크로노즐을 제작하는데 필수적인 공정으로, 유도결합플라즈마를 이용해 실리콘 웨이퍼를 식각시키는 기술을 말한다. 보쉬 공정에 사용되는 플라즈마 기체는 $SF_6$와 $C_4F_8$인데, 이 두 가지 기체를 번갈아가면서 사용하여 실리콘 웨이퍼를 이방성 식각하는 것이 그 특징이다. 보쉬 공정에는 다양한 변수가 존재하며 이를 적절히 통제하면 마이크로노즐에 적합한 프로파일을 실리콘 웨이퍼 내에 형성시킬 수 있다. 본 연구에서는 보쉬 공정을 이용하여 3차원 마이크로 노즐을 제작하였다. 기존에 반응성이온식각(deep reactive ion etching, DRIE) 공정을 통해 마이크로노즐을 제작한 사례가 많이 보고되었지만 이들은 모두 2차원적으로 마이크로노즐을 제작하였다. 2차원적으로 제작한 마이크로노즐은 마이크로 로켓에 주로 사용되었지만, 초음속으로 가속된 분말이 노즐의 형상으로 인한 유체 흐름의 불안정성 때문에 NPDS에서는 오래도록 사용할 수 없다는 문제점이 있다. 그러므로 본 연구에서는 마이크로노즐을 3차원 형상으로 제작함으로써 이러한 문제점을 해결하고자 하였다.