• 천문학논총
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• 제32권1호
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• pp.109-111
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• 2017

We detected bright mid- to far-infrared emission from the helium nova V445 Puppis in the AKARI all-sky survey data taken in 2006. Assuming an optically thin condition, we decomposed the spectral energy distribution (SED) of V445 Puppis in October 2006 by model fitting and found that the SED can be explained by a combination of cold amorphous carbon (125 K and the mass of $4.5^{+6.6}_{-2.7}{\times}10^{-4}M_{\odot}$) and warm amorphous carbon (250 K and the mass of $1.8^{+1.0}_{-0.5}{\times}10^{-5}M_{\odot}$). Assuming that the former is pre-existing dust formed in the past nova outbursts and the latter is newly formed dust in December 2000's nova wind, this result suggests that the amount of dust formed around V445 Puppis in a single outburst is larger than $10^{-5}M_{\odot}$, which is larger than those in any other classical novae ever reported.

• 천문학회보
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• 제43권1호
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• pp.45.1-45.1
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• 2018

Formation of filaments and subsequent dense cores in ISM is one of the essential questions to address in star formation. To investigate this scenario in detail, we recently started a molecular line survey namely 'Filaments, the Universal Nursery of Stars (FUNS)' toward nearby filamentary clouds in Gould Belt using TRAO 14m single dish telescope equipped with a 16 multi-beam array. In the present work, we report the first look results of kinematics of a low mass star forming region L1478 of California molecular cloud. This region is found to be consisting of long filaments with a hub-filament structure. We performed On-The-Fly mapping observations covering ~1.1 square degree area of this region using C18O(1-0) as a low density tracer and 0.13 square degree area using N2H+(1-0) as a high density tracer, respectively. CS (2-1) and SO (32-21) were also used simultaneously to map ~290 square arcminute area of this region. We identified 10 filaments applying Dendrogram technique to C18O data-cube and 13 dense cores using FellWalker and N2H+ data set. Basic physical properties of filaments such as mass, length, width, velocity field, and velocity dispersion are derived. It is found that filaments in L~1478 are velocity coherent and supercritical. Especially the filaments which are highly supercritical are found to have dense cores detected in N2H+. Non-thermal velocity dispersions derived from C18O and N2H+ suggest that most of the dense cores are subsonic or transonic while the surrounding filaments are transonic or supersonic. We concluded that filaments in L~1478 are gravitationally unstable which might collapse to form dense cores and stars. We also suggest that formation mechanism can be different in individual filament depending on its morphology and environment.

• 디지털융복합연구
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• 제11권1호
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• pp.47-60
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• 2013

본 논문은 산업기술 보호와 관련된 국제표준의 역할에 주목하여 중소기업에 대한 ISMS의 효과와 성과에 미치는 영향요인을 분석한 것이다. 특히 인증의 효과 및 성과에 관한 설문조사를 통해 경영성과 및 운영성과를 측정하고, 요인분석을 통해 도출된 성과변수에 대하여 분산분석과 회귀분석을 통하여 ISMS 인증효과에 영향을 미치는 주요 요인을 도출하였다. 요인분석과 집단이분산성을 고려한 회귀분석 결과, 업종과 기업 규모에 따른 영향은 확인되지 않았으나 보안조직 여부, 정보보안투자 그리고 경영진과 종업원의 보안의식 수준이 ISMS 인증효과에 유의한 영향을 미치는 것으로 나타났다. 이를 통해 산업기술유출을 방지하기 위해서는 인증과 병행해 보안 역량과 투자가 병행되어야 하고, 업종 혹은 산업의 구분이 크지 않은 만큼 산업기술 보호를 위한 인프라 혹은 시스템으로서 인증의 중요성을 확인할 수 있었다고 하겠다.

• Journal of Positioning, Navigation, and Timing
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• 제13권1호
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• pp.53-61
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• 2024

Global Navigation Satellite Systems are expected to meet system-defined integrity requirements when users utilize the system for safety critical applications. While the guaranteed integrity performance of GPS and Galileo is publicly available, their integrity assurance procedure and related methodology have not been released to the public in an official document format. This paper summarizes the integrity assurance procedures of Global Positioning System (GPS) and Galileo, which were utilized during their system development, through a literature survey of their integrity assurance methodology. GPS Block II assures system integrity using the following methods: continuous performance monitoring and maintenance on Space Segment (SS) and Control Segment (CS), through a cause and effect analysis of anomalies and a failure analysis. In GPS Block III, to achieve more stringent integrity performance, safety requirements are integrated into the system design and development from its starting phase to the final phase. Galileo's integrity performance is provided in the Integrity Support Message (ISM) format, as Galileo utilizes a Dual Frequency Multi Constellation (DFMC) Satellite Based Augmentation System (SBAS) and Advanced Receiver Autonomous Integrity Monitoring (ARAIM) to serve safety critical applications. The integrity performance of Galileo is ensured by using a methodology similar to GPS Block II (i.e. continuous performance monitoring and maintenance on the system). The integrity assurance procedures reviewed in this paper can be utilized for a new satellite navigation system that will be developed in the near future.

• Journal of Astronomy and Space Sciences
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• 제22권2호
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• pp.125-138
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• 2005

S152 분자운은 S152 분자운 복합체의 중심부에 있으며 페르세우스 나선 팔에 위치하고 있는 작고 밝은 발광 성운이다. 이 분자운까지의 광학적 거리는 3.5kpc이며 지름은 약 1.5pc으로 알려져 있다 . S152 분자운 좌측에는 초신성 잔해로 알려진 SNR G109.1-1.0이 위치하며, S152 분자운 복합체 전체 구조는 전갈 형태를 띠고 있는데, SNR G109.1-1.0과 S152 분자운이 접하는 부분은 특이한 반구 형태를 띠고 있어 많은 연구가 진행되어 왔다. 본 연구에서 FCRAO $^{12}CO(J=\;1{\to}0)$우리 은하 탐사 자료를 이용해 S152 분자운 복합체의 전체 속도 구조를 분석한 결과, 세 개의 다른 속도 성분 값 -54.5, -50.4, -48.8km $s^{-1}$ 에서 구조적인 차이를 보였다. S152 분자운 복합체의 속도 기울기는 0.21km $s^{-1}pc^{-1}$과 0.16km $s^{-1}pc^{-1}$인데 두 개의 속도 기울기 방향이 다르게 분석되었다. 이것은 S152 분자운 주변 영역이 SNR G109.1-1.0 과 상호 작용을 일으킨 후 다른 가스 운들이 병합되면서 서로 다른 진화 과정을 거친 결과로 생각된다.

• 정보보호학회논문지
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• 제19권5호
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• pp.119-130
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• 2009

우리나라 전자정부는 UN 전자정부 참여지수 2위, 미국 브루킹스연구소(전 브라운대학) 평가에서 3년 연속 1위를 차지할 정도로 잘 구축되어 있으나, 반면에 세계경제포럼(WEF)에서 2007년 조사한 정보보호 순위는 51위로서 인터넷 이용자수와 서비스 환경에 비해서 상대적으로 열악한 수준이다. 2008년 한 해 동안에만 옥션 정보유출, GS 칼텍스 정보 유출 등 크고 작은 보안 사고들이 끊임없이 발생하여 국민들이 사이버위협에 노출되고 주요 정보들이 유출되자 점차 정보보안, 개인정보보호의 필요성과 중요성에 눈을 뜨게 되어 정보보호에 대한 요구가 점차 늘어나고 있는 추세이다. 본고에서는 주요 국가들의 전자정부 서비스 수준과 정보보호를 위한 투자 제도 정책 등을 벤치마킹하여, 우리나라에서 이를 효율적으로 활용할 수 있는 방안을 찾아보고, 중앙행정기관 및 지방자치단체에서 제공하고 있는 전자정부 서비스의 안전성과 보안성을 향상시킬 수 있도록 국제적으로 표준화된 정보보호 관리체계인 ISO 27001 ISMS를 적용할 수 있는 정책을 발굴하여 국가 정보보호 수준을 더욱 높이고자 한다.

• 지능정보연구
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• 제23권1호
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• pp.143-159
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• 2017

급속한 IT의 발전으로 인해 개인정보뿐만 아니라 기업이 보유하고 있는 핵심 기술 및 정보에 대한 유출 위협이 중요한 이슈로 인식되고 있다. 기업에게 있어서 보유하고 있는 핵심 기술은 기업의 생존 및 지속적으로 경쟁 우위를 차지하기 위해 매우 중요한 부분이다. 최근 기술 침해 사례가 많이 일어나고 있는데, 기술 유출은 기업에게 있어서 주가하락 등의 막대한 재무적인 손실을 가져올 뿐만 아니라, 기업의 신뢰에 손상을 입게 되고, 기업의 발전을 지연시키게 되는 악영향을 미치게 된다. 특히, 대기업에 비해 핵심기술이 기업 내 중요한 많은 부분을 차지하는 중소기업에 있어서 기술 유출에 대한 대비는 기업의 존립에 있어서 필수적인 요소로 볼 수 있다. 이처럼 정보 보안 관리의 필요성과 중요성이 대두되면서 기업 입장에서 조기에 기술 침해 위협에 대해 확인하고 대비할 필요가 있다. 본 연구에서는 기술 유출에 영향을 미치는 요인들을 탐색하는 실증 분석을 수행하고, 인공지능 알고리즘을 통해 기술유출 조기경보시스템을 개발하고자 한다. 구체적으로 본 연구에서는 중소기업이 보유한 기술 유출에 영향을 미치는 요인들을 로지스틱 회귀분석을 통해 확인해보고, 통계분석을 통해 검증된 요인들을 기반으로 인공지능 여러 기법들 중 하나인 Support Vector Machine을 활용하여 기술침해 가능성을 조기에 알려주는 모형을 개발하였다. 본 연구에서 제안하는 기술 유출 가능성에 대한 조기 경보 모형을 통해 기업 및 정부 관점에서 기술 유출을 미리 예방할 수 있는 기회를 제공할 수 있을 것으로 기대된다.

• 미술이론과 현장
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• 제1호
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• pp.109-144
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• 2003

Orientalness is a concept that expresses the collective identity of the Orient in relation to the West. The concept itself is mutable and defined by the relationship between the two regions at different points in time. Changes in the concept depend on a number of factors, such as cultural influence, the political balance of power between the two regions, and on the interpretative scheme that defines the relationship. In addition, the geographical notion of the concept evolves culturally, socially and politically. During this process, Oriental-ness becomes Oriental-ism at times. I will attempt to survey and measure the progression of Orientalness from its emergence in early 17th century to its subsequent transformation in modern Korea as reflected in art theory and art works. The recognition of the comparative characteristics of Oriental art began when the Orient was exposed to the art of the West in the late Ming dynasty during the early 17th century. The changes in the artistic climate in China affected the late Chosun. I will start with a brief introduction of this time and the birth of Orientalness. The concept gradually changed during the period of Enlightenment(開化期) towards the end of the 19th century, and during the colonial period( 1910-1945) it took on a new form. Establishment of the concept of "Orient"as a single, unifying concept spanning across cultures and national boundaries has been attributed to late Meiji period Japan, whose intention at that time is believed to have been to build a pan-Asia(亞細亞) empire with Japan at its commanding center. It has been stressed that the real motive behind the formation of one single cultural unit, where the shared common written language was Chinese and Confucianism and Taoism were the common metaphysical traditions, was to build one political unit. When the notion of a geographical unit of Asia was replaced by the concept of Asia as a cultural and political unit, a massive growth of interest and discourse were provoked around the concept of Orientalism. When Orientalism was being formulated, Korea automatically became member of "one Asia" when the country became colonized. For Koreans, the identity of the Orient had to be defined in cultural terms, as the political notion of a nation was non-existent at that time. The definition of identity was pursued at two levels, pan-Asian and local. If Orientalism was an elite discourse centered in pan-Asian philosophical and religious tradition, localized Orientalism was a popular discourse emphasizing locality as the byproduct of natural geographic condition. After the liberation in 1945 from colonial rule, a thrust of movement arose towards political nationalism. Two types of discourses on Orientalism, elite and popular, continued as central themes in art. Despite the effort to redefine the national identity by eradicating the cultural language of the colonial past, the past was enduring well into the present time. As discussed above, even when the painting themes were selected from Korean history, the tradition of using history painting as a manifestation of political policy to glorify the local identity had its founding during the Meiji period. The elevation of folk art to the level of high art also goes back to the colonial promotion of local color and local sentiment. Again, the succession of the past (colonial) ideal was defended as the tradition assumed a distinct modern shape that was abstract in style. The concept of the "Orient" is of relative and changing nature. It was formulated in relation to Western culture or civilization. Whatever the real motive of the adoption of them had been, the superiority of the Orient was emphasized at all times. The essence of the Orient was always perceived as the metaphysical tradition as a way to downgrade Western culture as materialistic. This view still prevails and the principle of Orient was always sought in Confucianism, Taoism, and Buddhism. Even when Orientalism was employed by imperialist Japan in an effort to establish her position as the center of the Orient, the spiritual source was still in Chinese philosophy and religion. In art also, the Chinese literati tradition became the major platform for elite discourse. Orientalism was also defined locally, and the so-called local color was pursued in terms of theme and style. Thus trend continued despite the effort to eradicate the remnants of colonial culture long after liberation. These efforts are now being supported politically and also institutionalized to become the aesthetic ideal of the modern Korean art.