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- 저자 : 장경애 (검색결과 235 건)
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장경애 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1
The caustics of gravitational lens plays an important role to intensify and/or de-intensify the brightness of the lensed images due to gravitational lensing phenomena. It is a well known fact that a source crossing the caustic induces the so-called high amplification events (HAE). In the present study we examine the physical properties of caustics as well as their morphological structure. The calculation is performed for various configuration of point-like n-body lens with an equal mass. The results show that the characteristic of caustics for the n-body is not different from the Chang-Refsdal lens, no matter how many number of lenses are involved in an n-body lens system.
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장경애 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
Gravitational lensing is widely studied in relation to many different astrophysical applications, since first discovery of the double QSO0957+561A,B as gravitationally lensed objects One of the well-known-application is the determination of the distance scale to extra galactic objects, in other words the determination of the Hubble constant, H_o. Recent observations discover many various gravitational lensing systems. HST(Hubb1e Space Telescope) and VLBI equivalently contribute to detect more lensing objects Optical observational data combined with Radio data provide us better modeling of gravitational lens, which as a result yield promising technique how to determine Hubble constant precisely. Various techniques so-far developed to determine Hubble constant will be reviewed and compared with the method from gravitational lensing Various sources of error which might be influenced to determined Hubble values will also be examined Most of recent studies show that the present value of H_o, may not be less than 70km/s/Mpc. It is safe to say, however, that H_o, would be in arange of 60 highest upto 100 km/s/Mpc.
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장경애 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
The method is introduced how to determine the Hubble constant or/and the age of the universe by means of observed gravitational lens effects. Time delay between observed lensed images is one of the measurable quantities of gravitational lensing phenomena. We present the relevant formula to determine the time delay by wavefront method. The relation between the time delav and the Hubble constant is discussed and applied to the double QSO 0957+561 A,B.
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장경애 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.23 No.1
The gravitational lens system consisting of two mass points with very large mass ratio is basic concept for the Chang-Refsdal lens system, which in fact is known to be a two-body gravitational lens model. Light source of the lens system is taken to be QSO(Quasar Stellar Object). We reexamine optical properties of the system in context with optical shear. The caustic structures of different gravitational lens models are also discussed. It is also investigated how accurately the Chang-Refsdal lens approximation would be applied to n-body problem. It is shown that the Chang-Refsdal lens is accurate enough for the lensing system with the parent shear equal to that of the perturbing mass. One could thus apply the Chang-Refsdal lens model into n-body lensing system.
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거시중력렌즈와 미시중력렌즈에 의한 중력렌즈효과 비교 분석
장경애 청주대학교 2011 産業科學硏究 Vol.29 No.1
Gravitational lensing is a well-known tool to understand astrophysical information, such as density distribution in gravitational lens, dark matter, Hubble constant, and structure of galactic nuclei, etc. Strong effects of lensing have been used in studying them. Strong and weak effects of lensing are macrogravitational lensing, which represents classical gravitational lensing effects. In this note we will review the comparative analysis on macro- and micro-gravitational lensing effects. Some misinterpretation on them and the difference between these two effects would be clarified in context with gravitational lensing theories.
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장경애 청주대학교 2009 産業科學硏究 Vol.27 No.1
A light ray interacts with a local distribution of matter during its passing through gravitational field. The field is assumed a weak gravitational potential field. We assume that the configuration of that matter does not significantly changed, as photons traveling along the world line. Bending effect of a light ray due to gravitational potential may be examined by the equation of motion in the metric. Since the post Minkowskian metric satisfies the weak field condition, the potential is then treated just like the potential in Newton's theory. The linear approximation leading to the metric is accepted in interpreting the bending effects.
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중국인 유학생의 흡연경험에 따른 구강건강관련 자기효능감과 삶의 질의 융합적 관계
장경애,허성은 중소기업융합학회 2019 융합정보논문지 Vol.9 No.4
In this study, a survey was conducted on Chinese students in a university in Busan, in order to investigate the relationship between oral health-related self-efficacy and quality of life according to smoking experience of Chinese students living in South Korea. The results of analyzing collected data with the SPSS 24.0 program showed that students without smoking experience had higher scores in brushing, oral health-related self-efficacy and oral health-related quality of life than those with smoking experience. Brushing self-efficacy was positively correlated with oral health-related self-efficacy, and oral health-related self-efficacy was positively correlated with oral health quality of life, which were all statistically significant. It was found that the presence or absence of smoking experience was associated with oral health promotion and improvement of quality of life in foreign students. Thus, the results of this study are expected to be used as basic data by conveying the necessity of developing oral health promotion programs for healthy living of foreign students. 본 연구는 국내거주 중국인 유학생의 흡연경험 유무에 따른 구강건강관련 자기효능감과 삶의 질의 관계를 파악하고자 부산시내에 위치한 지역대학 내 중국 유학생을 대상으로 설문 조사를 실시하였다. 수집된 자료를 SPSS 24.0 프로그램을 통해 분석한 결과 흡연 비경험자가 흡연 경험자보다 칫솔질과 구강건강관리 관련 자기효능감, 구강건강관련 삶의 질의 점수가 각각 높게 나타나 유의한 결과가 나타났다. 칫솔질 자기효능감은 구강건강관리 관련 자기효능감과 정적 상관을 가지고 있었고, 구강건강관리 관련 자기효능감은 구강건강 삶의 질과 정적 상관을 가지고 있어 유의미한 결과를 보였다. 따라서 흡연경험의 유무는 외국인 유학생의 구강건강증진 및 삶의 질 향상과 관계가 있는 것으로 나타나 건강한 유학생활을 위해 구강건강증진 프로그램 개발의 필요성을 전달하여 기초자료로 활용되기를 기대한다.
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장경애 청주대학교 산업과학연구소 1994 産業科學硏究 Vol.12 No.-
A theoretical framework is persued for investigation of the motion of caustic network produced by two point mass lens. It is shown that the velocity of the caustics corresponds to the frequency of high amplification events. The ghost caustic network also influences to the high amplification events in case of two point mass lens.
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