• Title/Summary/Keyword: 효과크기

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작물별 주요 병해 - 고추

  • Park, Gyeong-Seok
    • Life and Agrochemicals
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    • s.248
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    • pp.44-45
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    • 2009
  • 고추는 가지과에 속하는 1년생 초본이다. 품종에 따라 모양, 색깔, 크기, 매운맛의 정도가 다르고 풍토에 적응성이 강해서 오래 재배되는 동안에 교잡하여 고추의 품종이 50여종이나 된다. 비타민A의 모체인 카로틴과 비타민 C가 다른 채소에 비해 특히 많으며 무기질이 골고루 들어 있고, 매운맛 성분인 캡사이신9Capsicin)은 식욕증진, 소화개선작용, 암유전과 발현조절작용으로 항암효과와 산화방지효과가 있다.

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에너지 소비효율 개선과 리바운드 효과: 수송부문을 중심으로

  • Kim, Dae-Uk;Kim, Jong-Ho
    • Environmental and Resource Economics Review
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    • v.21 no.2
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    • pp.321-340
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    • 2012
  • Korean government recently announced that new passenger cars sold within South Korea in 2009 ran an average of 12.27 kilometers per liter of fuel, which is an 7% point increase of the fuel efficiency. The government interpreted these improvements in the fuel economy as energy savings of 60,000 toe and as a reduction of 160,000 ton $CO_2$ emissions. However, improvements in energy efficiency make energy services cheaper, which is known as rebound effect. If this rebound effect exists, and the size of the effect is not negligible, ignoring this could result in overestimating the energy savings achieved by the fuel efficiency increase. Using detailed data on household and vehicle characteristics, our results suggest that there exist a short-run rebound effect of 0.299(29.9%) for the Korean automobile industry. This is notably smaller than the estimates of West (2004), which finds an estimate of 87% using cross-section data for the US. Furthermore our results highlight the importance of rebound effect on energy savings and the $CO_2$ emissions reduction. Our estimates suggest that the report from Korean government overestimates the energy savings and related $CO_2$ emissions by 29.9% point.

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Effects of Death Education Programs among Korean Aged in the Convergence Era: A Systematic Review and Meta-Analysis (융복합 시대 한국 노인의 죽음교육 프로그램 효과: 체계적 문헌고찰 및 메타분석)

  • Kim, Hyunsim;Park, Seurk
    • Journal of Convergence for Information Technology
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    • v.12 no.5
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    • pp.71-82
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    • 2022
  • This study aimed to identify the effects of death education programs among Korean aged on death anxiety and attitudes toward death in the convergence era. The searched kew words were included aged, death education program, death anxiety, and attitudes to death in the research papers published in Korea. Finally, 11 studies were selected and the effect size was calculated. Death anxiety and death attitude were selected as dependent variables, and publication type, total duration of intervention, and frequency of intervention were selected as moderator variables. The total of 11 papers were selected to estimate the effect sizes of interventions. As a result, the overall effect size of the death education program for the aged was 1.07. The overall effect size showed death education program was able to lower death anxiety (Hedges' g=1.30, 95% Cl=0.80~1.80, p<.01) and improve attitudes to death (Hedges' g=0.93, 95% Cl=0.49~1.37, p<.01) compared with the no intervention group. In the moderator analysis to identify the cause of heterogeneity, significant results were found in the frequency of intervention. We propose a study that repeatedly verifies the effect of related studies in the future by providing the theoretical basis and basic data for the development of the death education program.

An Empirical Study on User's Continuance Intention Towards Mobile IM Service in China (중국 모바일 인스턴트 메시징 서비스의 지속사용 의도에 관한 실증연구)

  • Luo, Weiyi;Shao, Jing;Lee, Young-Chan
    • Information Systems Review
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    • v.15 no.2
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    • pp.91-110
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    • 2013
  • Due to the intense competition and low switching cost, to find out which factors will significantly impact on user's continuance intention is very important for mobile instant messaging (IM) practitioners. In this study, we adopted network externalities and perceived service quality as independent variables based on the definition of mobile IM service. Network externalities also include direct externalities (referent network size) and indirect externalities (perceived complementarity). The result of this study shows that referent network size has a critical influence on perceived usefulness and perceived complementarity has a critical influence on perceived enjoyment; perceived service quality, as we expected, has significantly impact on not only customer's satisfaction but also perceived usefulness and perceived enjoyment. Meanwhile, both perceived usefulness and perceived enjoyment have directly critical influences on customer's continuance intention.

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A Study on the Weight Adjustment Method for Household Panel Survey (가구 패널조사에서의 가중치 조정에 관한 연구)

  • NamKung, Pyong;Byun, Jong-Seok;Lim, Chan-Soo
    • The Korean Journal of Applied Statistics
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    • v.22 no.6
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    • pp.1315-1329
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    • 2009
  • The panel survey is need to have a more concern about a response due to a secession and non-response of a sample. And generally a population is not fixed and continuously changed. Thus, the rotation sample design can be used by the method replacing the panel research. This paper is the study of comparison to equal weight method, Duncan weight, Design weight method, weight share method in rotation sample design. More specifically, this paper compared variance estimators about the existing each method for the efficiency comparison, and to compare the precision using the relative efficiency gain by the Coefficient Variance(CV) after getting the design weight from the actual data.