• 제목/요약/키워드: Near-poor

검색결과 272건 처리시간 0.03초

WITNESSING DISSOLUTION OF A STAR CLUSTER IN THE SEXTANS DWARF GALAXY

  • Kim, Hak-Sub;Han, Sang-Il;Joo, Seok-Joo;Yoon, Suk-Jin
    • 천문학회보
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    • 제43권1호
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    • pp.32.3-32.3
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    • 2018
  • We report a possible discovery of a relic of a dissolved star cluster in the Sextans dwarf spheroidal galaxy. Using the hk index (${\equiv}$(Ca-b)-(b-y)) as a photometric metallicity indicator, we have successfully discriminated the metal-poor and metal-rich stars in the galaxy and found an unexpected number density peak of metal-poor stars near the galaxy center. The analysis of color-magnitude diagrams reveals that they appear to be originated from an old, metal-poor globular cluster which might be slightly farther than the bulk of field stars in the galaxy. This supports the presence of the star cluster remnants in the galaxy which have been suggested by previous studies. If confirmed, dissolution of a star cluster provides a piece of evidence of a cored dark-matter halo profile for the Sextans dwarf galaxy.

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EVALUATION OF NIRS FOR ASSESSING PHYSICAL AND CHEMICAL CHARACTERISTICS OF LINEN WEFT YARN

  • Sharma, Hss;Kernaghan, K.;Whiteside, L.
    • 한국근적외분광분석학회:학술대회논문집
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    • 한국근적외분광분석학회 2001년도 NIR-2001
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    • pp.1091-1091
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    • 2001
  • Previous reports have shown that Near Infrared Spectroscopy (NIRS) can be used to assess physical and chemical properties of flax fibre and fabric quality. Currently, spinners assess yarn quality mainly based on strength and regularity measurements. There two key characteristics are influenced by quality of raw fibres used, especially the degree of rotting and strength. The aim of this investigation was to evaluate the use of NIRS for assessing quality of weft grade yarn available on the commercial market. In order to develop the NIR calibrations, a range of samples representing poor, medium and good quality weft yarn samples was included in the calibration and validation sample sets. The samples were analysed for physical and chemical parameters including caustic weight loss, fibre fractions, lipid, ash and minerals. A detailed protocol for assessing yarn quality has been developed to maximize the accuracy of the reflectance spectra. The development of partial least squares regression models and validation of the calibration equations using blind samples will be presented and discussed.

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노인의 삶의 질 관련요인 분석 (The Effects of Related Factors on Quality of Life for the Elderly)

  • 강이주
    • 가정과삶의질연구
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    • 제26권5호
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    • pp.129-142
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    • 2008
  • This study examines how economic and psychological characteristics affect the quality of life (QoL) of elderly individuals age 60 and older, who live in the Seoul-metropolitan area. Relationships among socio-demographic status, economic conditions, psychological characteristics, family life, health status, and QoL are examined by t-test and ANOVA(Duncan's test as post hoc multiple comparisons), and the multiple regression analysis is used to estimate QoL determinants in the elderly. The major findings of the study are as follows. First, younger age, higher education levels, better health status, harmonious family relations, higher levels of household income, lower levels of loneliness, and higher self-esteems are related to higher QoL levels. Second, the impacts of factors on QoL are differentiated according to tercile groups that divide monthly allowance of respondents into three categories: below normal (threshold amount below 21MW), near normal (threshold amount between 21MW and 35MW), and above normal (threshold amount above 35MW). For each tercile group, poor health status or higher loneliness have negative effects on QoL, while harmonious family relationship has a positive effect. For the below-normal group, years of education or self-esteem have positive effects, while age or retirement status have negative effects when controlling for other factors. For the near-normal group, being married, or perceived financial insecurity create lower QoL levels, while higher self-esteem increases QoL levels. For the above-normal group, being widowed, employed, or retired have positive effects on QoL, when controlling for other variables. Third, even among elderly with high allowances, the effects of health status and family relationship are significant determinants that explain QoL levels. This result suggests that, for te elderly, poor health status and poor family relationships severely decrease QoL in later life, regardless of economic condition.

공공부조 수급에서 제외된 빈곤노인의 현황과 특성 (A Study on the Size, Composition, and Characteristics of Poor Elders Excluded from the Public Assistance)

  • 최희경
    • 한국사회복지학
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    • 제56권2호
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    • pp.237-259
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    • 2004
  • 공적 연금이 미성숙한 우리나라에서는 실질적으로 공공부조가 빈곤노인을 위한 소득보장제도로 기능하고 있다. 그러나 제도상의 문제로 인하여 많은 수의 빈곤노인들이 국민기초생활보장 제도와 경로연금 제도에서 제외됨으로써 소득보장의 사각지대에 방치되어 있다. 이 연구에서는 공공부조에서 제외된 빈곤노인의 규모와 현황을 파악하고 공공부조 수급의 결정요인을 분석하였다. 분석 결과 차상위계층과 절대빈곤층이 모두 포함된 빈곤노인가구 중 절반 이상이 공공부조 수급을 받지 못하고 있으며, 공공부조에서 제외된 빈곤노인가구는 인구학적 특성과 소득특성이 열악하여 공공부조 수급의 욕구가 큰 것으로 나타났다. 그리고 노인의 공공부조 수급은 주로 인구학적 특성과, 가족부양상황을 반영하는 가족이전소득에 의해 결정되는 것으로 밝혀져, 빈곤노인들의 소득상의 욕구를 고려한 소득보장이 시급한 것으로 분석되었다.

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저소득층의 의료 이용과 욕구 미충족에 영향을 미치는 요인 (Factors Affecting the Choice of Medical Care Use by the Poor)

  • 김진구
    • 사회복지연구
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    • 제37호
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    • pp.5-33
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    • 2008
  • 본 연구는 국민건강영양조사 3기 자료를 이용하여 저소득층의 의료이용에 대해 살펴 보았으며, 분석의 초점은 충족되지 않은 의료욕구와 의료급여제도의 효과에 두어졌다. 분석 결과 전반적으로 저소득층은 건강상태가 좋지 않은 반면 가구총소득이나 직업 등 가능요인 측면에서는 매우 불리한 조건에 놓여 있어, 의료욕구는 높으나 이를 충족시킬 자원이 부족한 상황인 것으로 나타났다. 그럼에도 불구하고 실제 저소득층의 의료기관 이용여부는 입원, 외래, 약국 등 모든 측면에서 일반인들보다 높게 나타났으며, 이는 다른 요인들을 통제했을 경우에도 유의미하였다. 분산분석(ANOVA) 결과 이용횟수에 있어서도 의료급여수급자들이 많았다. 반면, 비용 측면에서는 분산분석에서 통계적인 유의도가 검증되지 않았으나, 질병관련 요인을 비롯한 다른 요인들을 통제했을 경우 의료급여제도는 분명히 의료비용을 낮추는 효과가 있다. 의료이용에 대한 분석에서 의료급여제도는 저소득층의 좋지 않은 건강상태와 빈약한 경제적 조건을 효과적으로 보완하여 긍정적으로 기능하고 있는 것으로 분석되었다. 그러나, 의료급여제도는 저소득층의 의료욕구를 충분히 충족시켜주는데는 여전히 부족한 것으로 나타났다. 저소득층의 충족되지 않은 의료욕구는 여전히 일반인들보다 크며, 그 이유 중 가장 큰 것은 경제적인 이유였다. 이에 대한 계량분석결과 의료급여 1종과 2종, 차상위계층 등 모든 빈곤계층은 의료이용 포기가 일반 건강보험 가입자에 비해 높은 것으로 제시되고 있다. 의료급여 대상자들의 높은 의료이용량에도 불구하고 여전히 저소득층의 충족되지 않은 의료욕구가 크다는 것은 의료급여가 대상자들의 자원부족을 보완하여 어느정도 의료접근성을 높여주고 있지만 대상자들이 가진 의료욕구를 완전히 해소하기에는 불충분하다는 것을 의미하는 것이다.

Impact of Lyman alpha pressure on metal-poor dwarf galaxies

  • Kimm, Taysun;Haehnelt, Martin;Blaizot, Jeremy;Katz, Harley;Michel-Dansac, Leo;Garel, Thibault;Rosdahl, Joakim;Teyssier, Romain
    • 천문학회보
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    • 제43권1호
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    • pp.36.1-36.1
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    • 2018
  • Understanding the origin of strong galactic outflows and the suppression of star formation in dwarf galaxies is a key problem in galaxy formation. Using a set of radiation-hydrodynamic simulations of an isolated dwarf galaxy, we show that the momentum transferred from resonantly scattered Lyman-alpha(LyA) photons can suppress star formation by a factor of two in metal-poor galaxies by regulating the dynamics of star-forming clouds before the onset of supernova explosions (SNe). This is possible because each LyA photon resonantly scatters and imparts ~10-300 times greater momentum than in the single scattering limit. Consequently, the number of star clusters predicted in the simulations is reduced by a factor of ~5, compared to the model without the early feedback. More importantly, we find that galactic outflows become weaker in the presence of strong LyA radiation feedback, as star formation and associated SNe become less bursty. We also examine a model in which radiation field is arbitrarily enhanced by a factor of up to 10, and reach the same conclusion. The typical mass-loading factors in our metal-poor dwarf system are estimated to be ~5-10 near the mid-plane, while it is reduced to ~1 at larger radii.

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Livelihoods and Income Diversification of Informal Recyclers: A Case Study in the Mekong River Delta, Vietnam

  • XUAN, Huynh Thi Dan;DUNG, Khong Tien;KHAI, Huynh Viet
    • The Journal of Asian Finance, Economics and Business
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    • 제9권2호
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    • pp.209-215
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    • 2022
  • This study aims to analyze the livelihood resources and income diversification of informal recyclers in the Mekong River Delta (MRD). The multiple linear regression model was applied to determine income diversification and total household income with the sustainable livelihood analysis framework developed by the United Kingdom Department for International Development (2000), including human resources, physical resources, natural resources, financial resources, and social resources. The results indicated that up to 25% of itinerant waste buyers worked on average more than 7.3 hours/day, which was higher than the urban near-poor level regulated by the Vietnam government. The results of the regression model revealed that total households' income was affected by the factors of health status, gender, urban location type 1, the amount of potential savings, and informal credit participation, while the factors of health status, urban location, the amount of potential savings, and informal credit participation have the effect of diversifying farm household income. Thus, if the informal waste recycling sector is supported and regulated by proper government management, it will not only help poor households diversify their income, but it will also help poor households diversify their income, particularly women's income, which is vulnerable and lower than male income in the MRD.

On the origin of low escape fractions in LBGs at z ~ 3

  • Yoo, Taehwa
    • 천문학회보
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    • 제43권2호
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    • pp.55.1-55.1
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    • 2018
  • Theoretical models of reionization require that approximately 10% of the Lyman Continumm (LyC) photons escape from their host dark matter haloes and re-ionize neutral hydrogen in the Universe. However, observations of Lyman break galaxies (LBGs) at z~3 report much lower escape fractions of $f_{esc}{\sim}1%$. In an attempt to understand the discrepancy, we perform radiation-hydrodynamics simulations of isolated disk galaxies using RAMSES-RT with high resolution (maximum ~ 9 pc). We find that $f_{esc}$ is ~6% on average for the reference run ($Z=0.1Z{\odot}$), whereas the fraction decreases to ~1% in the case of metal-rich disk ($Z=1Z{\odot}$). This happens because dense metal-poor gas clumps are disrupted early due to strong Lya pressure and supernova explosions, while star particles are trapped for a longer period of time in the metal-rich environments. We also find that $f_{esc}$ is still significant (~4%) even when the amount of metal-poor gas is increased by a factor of 5. Our preliminary results suggest that the low escape fractions in LBGs may be better explained by (locally) metal-enriched gas near young stars than high gas fractions in galaxies.

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3차 B-spline 함수를 이용한 열전도 및 유체문제의 해석 (Analysis for computing heat conduction and fluid problems using cubic B-spline function)

  • 김은필
    • 한국전산유체공학회지
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    • 제3권2호
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    • pp.1-8
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    • 1998
  • We make use of cubic B-spline interpolation function in two cases: heat conduction and fluid flow problems. Cubic B-spline test function is employed because it is superior to approximation of linear and non-linear problems. We investigated the accuracy of the numerical formulation and focused on the position of the breakpoints within the computational domain. When the domain is divided by partitions of equal space, the results show poor accuracy. For the case of a heat conduction problem this partition can not reflect the temperature gradient which is rapidly changed near the wall. To correct the problem, we have more grid points near the wall or the region which has a rapid change of variables. When we applied the unequally spaced breakpoints, the results show high accuracy. Based on the comparison of the linear problem, we extended to the highly non-linear fluid flow problems.

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