• 천문학회보
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• 제42권2호
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• pp.64.2-64.2
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• 2017

The Population III (Pop III) stars are thought to be massive. If massive Pop III stars form binary system and they experience mass transfer via the Roche lobe overflow, this may significantly change the properties of the system. For example, mass transfer in such system may shorten the period of the system, forming short period binary black hole (BBH) system, which is the most promising candidate for recently detected gravitational wave radiation sources. Also, there is an expectation that due to the stripped envelope of donor star by mass transfer, this system can play a significant role in the cosmic reionization by emitting more UV photons. However, this outcome highly depends on the initial properties of the system. We perform grid calculation on Pop III binary models with various initial primary masses (20 ~ 100 solar mass), initial separations, and initial mass ratios (q = 0.5 ~ 0.9). We find that 1) in most cases binary models show no increase in the number of ionizing photons and 2) formation of short period BBH system via mass transfer is highly unlikely.

• 천문학회보
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• 제34권2호
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• pp.80.1-80.1
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• 2009

• 천문학회보
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• 제36권2호
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• pp.146.2-146.2
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• 2011

In this study, we have derived the abundances of several elements ? Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, Ni - for the six F G K type stars in IC 2391 and the seven stars in NGC 6475. The spectra of those stars are taken from UVES POP archive data, of which resolution is 80,000. To derive the abundances of those elements, TAME (Tools for Automatic Measurement of Equivalent-widths), Kurucz stellar atmospheric model, and MOOG code are used. The stellar parameters (effective temperature, log g, metallicity, microturbulent velocity) are determined from the iron lines. The results provide the abundance differences of chemical elements between two open clusters, IC 2391 (a member of Gould Belt) and NGC 6475 (non-member of it), which would lead to better understanding about Gould Belt.

• 천문학회보
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• 제35권2호
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• pp.83.2-83.2
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• 2010

To understand about Gould Belt, we intend to study chemical abundances for two young open clusters - IC 2391 which is a member of Gould Belt and NGC 6475 which is not. UVES POP (Ultraviolet and Visual Echelle Spectrograph Paranal Observatory Project) provides the spectra of twelve stars in IC 2391 and five stars in NGC 6475 with spectral resolution R of 80,000. In this study, we have determined the stellar parameters (Teff, logg, metallicity, and microturbulant velocity) using Fe I and Fe II lines. The equivalent widths of iron lines have been measured by TAME. The results of stellar parameters are presented.

• 복식
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• 제58권6호
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• pp.69-84
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• 2008

Considering that star reflects the image of current society, analyzing fashion of celebrity is to read ideal type and demands of beauty of the era. Especially the rock music-represents youth culture that last on present day-born in 1960's, and it is considered to a significant decade in pop music history. Thus this research will analysis rock star's fashions in iconological view of E. Panofsky. The aim of this document is Clarifying how the fashion of pop stars appeared and what formed its worth. As a result of analyzing fashions of rock star in 1960's, it is available to find these sameness and difference. The Mods borrowed images of the past, and introduce the elite modernism and shows very urban style. The Folky and the Psychedelic showed post-structuralism propensity against industrial society, in the case of the Folky it induced styles that symbolize labor class to realize social worth. And as an aftereffect of war and repulsion of commercial worth, they embody nature-returning peasant look so that it shows pastoral mood in total. The Psychedelic express somewhat struggling escapism and it generated illusionary images with quests to superego and glorification to psychedelic status. The Folky and the Psychedelic are same in the side of introducing existentialism, this occurred by using ethnic factor. But the Folky showed plain outlook by pop propensity, on the other hand, the Psychedelic showed magnificent outlook such as optical art, pop art, and futurism ought to express merrymaking culture. And common feature of these is introduction of unisex mod which is came after the change of gender role. Thus each star or group has professed special ideology into their culture and it is reflected to acts which is including music and dress style. This affair is analyzed like these two things. The mass of people schemes their identity with inducing special ideology to their culture at the first. And the purpose to archive cultural hegemony in inter-social class at the next.

• 만화애니메이션 연구
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• 통권41호
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• pp.379-405
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• 2015

본 논문은 연극에서의 팬덤 형성 방법론을 모색하는 목적을 가지고 있다. 연구를 위해 이미 팬덤이 확산된 K-POP의 예를 들어 설명한다. 이후에 연극에 대입 가능한 항목과 한계점에 관해 기술한다. 팬덤은 수동적인 소비에서 벗어나 문화를 재탄생하는 영역까지 확장되었다. 팬덤의 문화 활동은 단순히 팬을 좋아하는 것을 벗어나 사회활동까지도 그 영역을 넓혀가고 있다. K-POP의 경우 한국을 넘어서 전 세계까지 팬덤을 가지고 있다. K-POP에서 팬덤이 형성될 수 있었던 이유는 첫 번째로 대형 기획사에 의한 기획형 스타가 존재했기 때문이다. 두 번째로 유투브(youtube)와 SNS 같은 온라인 확산으로 콘텐츠 접근방식의 간편화를 꼽을 수 있다. 마지막으로 팬덤의 문화 활동이 즐거움을 주어 팬덤을 유지, 지속시키기 때문에 가능하다고 분석 되었다. 이를 연극에 대입해 보면 연극의 경우 대형기획사에서 배우를 기획하여 양성하기에는 다소 무리가 있으나, 온라인 환경에 적합한 홍보방식을 개발하고 연극 관객에게 공통의 즐거움을 준다면 연극에서도 팬덤을 활성화 시킬 수 있는 가능성이 있다. K-POP과 연극은 콘텐츠 상의 차이가 존재하지만 팬덤이 활성화 되고 안정적으로 운영되고 있는 K-POP 팬덤의 방법론 중 온라인 홍보방식의 채택과 공유할 수 있는 문화를 제시하는 방법을 연극에 대입한다면 연극에서도 팬덤의 활성화가 가능하다.

• 천문학회보
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• 제37권1호
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• pp.42-42
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• 2012

The First stars (Pop.III stars) in the universe are expected to be formed between the recombination era at z - 1100 and the most distant quasar (z - 8). They have never been directly detected due to its faintness so far, but can be observed as a background radiation at around 1${\mu}m$ which is called the Cosmic Near-Infrared Background (CNB). Main part of the CNB is thought to be redshifted Lyman-alpha from gas clouds surrounding the Pop.III stars. Until now, the COBE (COsmic Background Explorer) and the IRTS (Infrared Telescope in Space) observed excess emission over the background due to galaxies. To confirm the COBE and the IRTS results and pursue more observational evidences, we carried out the sounding rocket experiment named the Cosmic Infrared Background ExpeRiment (CIBER). The CIBER is successfully launched on July 10, 2010 at White Sands Missile Range, New Mexico, USA. It consists of three kinds of instruments. We report the results obtained by LRS (Low Resolution Spectrometer) which is developed to fill the uncovered spectrum around 1${\mu}m$. LRS is a refractive telescope of 5.5 cm aperture with spectral resolution of 20 - 30 and wavelength coverage of 0.7 to 2.0${\mu}m$. After subtracting foreground components (zodiacal light, integrated star light and diffuse galactic light) from the sky brightness of observed five fields, there remained significant residual emission (even for the lower limit case) consistent with the IRTS and the COBE results. In addition, there exists a clear gap at 0.7 - 0.8${\mu}m$ in the CNB spectrum over the background due to galaxies according to recent results (Matsuoka et al. 2011; Mattila et al. 2011). The origin of the excess emission could be ascribed to the Pop.III stars with its active era of z = 7 - 10.

• 한국멀티미디어학회논문지
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• 제23권1호
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• pp.74-84
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• 2020

In November 2018, virtual pop band K/DA, with the use of holograms and actual K-pop girl group members, performed its debut album titled "POP/STARS" at the opening ceremony of the League of Legends S8 final, hosted by Riot Games. The fan culture that exists for real singers adapts itself to virtual bands, and K/DA, consisting of virtual characters, encouraging the production of user created content (UCC). However, this form of UCC is different from the most common one, meaning that this type of band generates another way of consuming content. Therefore, this study examines how K/DA's digital characters are transformed and reproduced by UCC and how the original producers' content differs from them. Firstly, the development of this study considers the open characteristics of UCC, such as user type, created motivation, created process, content type and sharing method. In the second part, the virtual idol Hatsune Miku and virtual band Pentakill will be analysed to understand UCC. Thirdly, K/DA will be analyzed as a case study based on three factors: created motivation, content type and sharing method. In this manner, this study aims to explain how UCC for virtual bands reproduce and consume original content and expand their commercial value.

• 한국콘텐츠학회논문지
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• 제12권1호
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• pp.125-137
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• 2012

2000년대 후반에 접어들며 한류의 전파는 초기와는 다른 양상으로 진행되기 시작했다. 한국 드라마와 영화에 더해 한국 대중음악(K-pop)이 한류 팬덤의 핵심이 되었으며, 이와 함께 한류의 주요 소비자층은 10대를 아우르는 세대적 포괄성을 갖추게 되었다. 인터넷의 발달은 한국 대중문화에 대한 접근성을 높였으며, 이에 따라 한류는 아시아라는 지역적 제한을 넘어선 전 지구적 현상으로 전개되게 되었다. 본 연구는 이러한 한류의 새로운 양상의 원인을 찾아내고, 이러한 변화가 갖고 있는 미디어연구에 있어서의 함의를 논의하고자 한다. 즉, 인터넷 등 신(新) 정보 테크놀로지와 대중문화 생산 및 수용 간의 함수관계를 밝히고자 한다. 본 연구는 이러한 한국 대중음악의 초국적 전파 과정을 통시적으로 재구성하는 한편, 유투브에서 유통되는 '소녀시대'의 히트곡 <지Gee> 뮤직 비디오에 달린 유투브 사용자들의 댓글을 분석함으로써 온라인상에서의 팬덤 활동을 분석 평가하고, 온라인 커뮤니티의 매체적 의미를 논하고자 한다. 이를 위해 온라인 민속지학(online ethnography 혹은 nethnography)을 주요 방법론으로 사용할 계획이며, 피스크(Fiske), 버지스(Burgess) 등에 의해 주도된 팬덤과 온라인 커뮤니티 연구에 관한 문헌들을 분석하고, 이를 본 연구의 이론적 틀로 구성할 계획이다.

• 천문학회보
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• 제42권1호
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• pp.59.1-59.1
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• 2017

Massive Population III black hole binary systems are one of the suggested candidate sources of the recently detected gravitational wave radiation (GWR). GWR detection from a black hole binary system requires a sufficiently short orbital separation at the time of their formation, such that they would undergo coalescence within the Hubble time. This condition cannot be simply fulfilled by a short initial period, because binary interactions such as mass transfer and common envelope evolution can largely change the orbital parameters and the masses of stellar components. Here, we discuss the possibility of black hole binary mergers from massive Pop III binary systems, using a new grid of Pop III binary evolutionary models with various initial primary masses ($20M_{\odot}{\leq}M{\leq}100M_{\odot}$) and initial separations, for different initial mass ratios (q = 0.5 - 0.9).