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RISS 인기검색어
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- 저자 : Crocker, A. F. (검색결과 12 건)
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Molecular gas and star formation in the red-sequence counter-rotating disc galaxy NGC 4550
Crocker, Alison F.,Jeong, Hyunjin,Komugi, Shinya,Combes, Francoise,Bureau, Martin,Young, Lisa M.,Yi, Sukyoung Blackwell Publishing Ltd 2009 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.393 No.4
<P>ABSTRACT</P><P>We present observations of the CO(1-0) emission in the central 750 pc (10 arcsec) of the counter-rotating disc galaxy NGC 4550, obtained at the Institut de Radioastronomie Millimétrique (IRAM) Plateau de Bure Interferometer. Very little molecular gas is detected, only 1×10<SUP>7</SUP> M<SUB>⊙</SUB>, and its distribution is lopsided, with twice as much molecular gas observed at positive relative velocities than at negative relative velocities. The velocity gradient in the CO(1-0) emission shows that the molecular gas rotates like the thicker of the two stellar discs, which is an unexpected alignment of rotations if the thinner disc was formed by a major gas accretion event. However, a simulation shows that the gas rotating like the thicker disc naturally results from the coplanar merger of two counter-rotating disc galaxies, demonstrating the feasibility of this scenario for the formation of NGC 4550. We investigate various star formation tracers to determine whether the molecular gas in NGC 4550 is currently forming stars. Ultraviolet (UV) imaging data and optical absorption line strengths both suggest a recent star formation episode; the best-fitting two-population model to the UV-optical colours yields a mass of young stars of 5.9×10<SUP>7</SUP> M<SUB>⊙</SUB> with an age of 280 Myr. The best information on the current star formation rate is a far-infrared-based upper limit of only 0.02 M<SUB>⊙</SUB> yr<SUP>−1</SUP>. We are thus witnessing NGC 4550 either in a dip within a bursty star formation period or during a more continuous low-level star formation episode.</P>
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있는 Map-Reduce구조에 대한 RDF/OWL 데이터 관리 : 접근 사이에 비교사이에 비교
크로케르기예르모(Guillermo Crocker Garc?a),이영구(Young-Koo Lee),이승룡(Sungyoung Lee) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1C
In a world in constant changes, more and more devices are producing data and it is indispensable to manage these data. That is why map reduce framework is a solution to manage a large amount of data in a fast and right way. In the other hand semantic web (RDF/OWL) is getting popular and can be a solution to manage data in an efficient way, so that such data can be retrieved and understood by both human and machine. In this paper we describes and analyze some projects that manages RDF with Map-Reduce framework.
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High-Throughput Synthesis of Anisotropic Colloids via Holographic Lithography
Moon, J. H.,Kim, A. J.,Crocker, J. C.,Yang, S. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.18
<B>Graphic Abstract</B> <P>Monodisperse anisotropic colloids are synthesized (see figure) via holographic lithography and using chemically amplified photoresists. The holographic lithography offers a high-throughput and flexible route to produce particles. To engineer colloidal particles, we apply direct modification of the photoresist surface either uniformly or selectively through chemical coupling, physical grafting, and selective metal deposition. <img src='wiley_img/09359648-2007-19-18-ADMA200700543-content.gif' alt='wiley_img/09359648-2007-19-18-ADMA200700543-content'> </P>
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클라우드 환경을 통한 확장 가능한 플랫폼 초기 상태의 자동 구성
고메즈마우리시오 ( Mauricio Alejandro Gomez Morales ),가레라베르니 ( Berny Alfonso Carrera Gordillo ),그로게르기예르모 ( Guillermo Crocker Garcia ),밤복흥 ( Pham Phuoc Hung ),이슬람 ( Md Motaharul Islam ),허의남 ( Eui-nam Huh ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.1
Companies that have high need of some computational resources for an specific space of time, nowadays, the pay as they use manner for resources required, that, is a good solution provided these days by some Cloud computing providers. Also solutions that represent a distributed computation for processes with high demand of calculation have appeared lately, the only problem is that when they are created, they need also be configured to share the same working space, this is the scope that comprehends this work, where the aim is to propose a framework that can be used as a solution of automation of the configurations that sometimes can take undetermined time and sometimes the user that configures it has to have a lot of knowledge and also configurations can turn in tricky ones generating a delay in the time where real productivity should be exploited.
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