• Journal of the Korean Data and Information Science Society
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• 제23권3호
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• pp.447-455
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• 2012

본 연구의 목적은 메타분석법을 이용하여 독해력 증진 프로그램의 효과를 분석하는 것이다. 이를 위해 2001년부터 2011년까지 연구된 독해력 관련 연구 70편을 종합한 효과크기를 산출하였으며, 이를 토대로 다음과 같은 연구결과를 얻었다. 첫째, 독해력 증진 프로그램 효과에 대한 평균 효과크기는 0.763으로 큰 편이었다. 둘째, 초등학교의 효과크기가 1.030으로 가장 큰 가운데, 학교 급간에는 통계적으로 유의한 차이가 있었다. 셋째, 학술지의 평균 효과크기가 1.250으로 학위논문의 평균 효과크기인 0.700 보다 통계적으로 유의하게 더 큰 것으로 나타났다. 넷째, 효과 측정방법에 대해서는 읽기방법의 효과크기가 더 컸으며, 다섯째, 적용언어에 대해서는 한국어가 영어보다 유의적으로 더 큰 것으로 나타났다. 본 연구를 수행하는 과정에서 미발표된 연구결과물을 포함시키지 못한 점은 본 연구의 한계이다. 그러나 메타분석을 활용하여 독해력 증진 프로그램의 효과에 대한 통합적인 결과를 도출하려는 시도는 나름대로 의의를 갖는다고 하겠다.

• 한국물환경학회지
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• 제37권4호
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• pp.286-295
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• 2021

The removal efficiency of road-deposited sediment (SDR) by road sweeping was analyzed by performing particle size analysis before and after road sweeping at four highways during May to December 2019. The SDR accounted for the largest proportion in the range of 250 to 850 ㎛ and the degree of its proportion had an effect on the particle size distribution curve. The particle size distribution of the collected sediments showed a similar distribution at all sites. Below 75 ㎛, the removal efficiency of SDR showed a constant value around 40%, but above 75 ㎛, it increased as the particle size increased. The removal efficiency was 82-90% (average 86%) for gravel, 66-93% (average 79%) for coarse sand, 35-92% (average 64%) for fine sand, 29-69% (average 44%) for very fine sand, 19-58% (average 40%) for silt loading, 10-59% (average 40%) for TSP, 13-57% (average 40%) for PM10, and 15-61% (average 38%) for PM2.5. SDR removal efficiency showed an average of 69% for the four highways. It was found that if the amount of SDR was less than 100 g/m², it was affected by the road surface condition and had a large regional deviation. As such, the amount of SDR and the removal efficiency increased. The fine particles, which have relatively low removal efficiency, contained a large amount of pollutants, which is an important factor in water and air pollution. Therefore, various measures to improve the removal efficiency of fine particles in SDR by road sweeping are needed.

• 한국재료학회지
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• 제26권11호
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• pp.662-669
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• 2016

In order to identify changes in the nature of the particles due to changes in the inflow rate of the raw material solution, the present study was intended to prepare nano-sized cobalt oxide ($Co_3O_4$) powder with an average particle size of 50 nm or less by spray pyrolysis reaction using raw cobalt chloride solution. As the inflow rate of the raw material solution increased, droplets formed by the pyrolysis reaction showed more divided form and the particle size distribution was more uneven. As the inflow rate of the solution increased from 2 to 10 ml/min, the average particle size of the formed particles increased from about 25 nm to 40 nm, while the average particle size did not show significant changes when the inflow rate increased from 10 to 50 ml/min. XRD analysis showed that the intensity of the XRD peaks increased remarkably when the inflow rate of the solution increased from 2 to 10 ml/min. On the other hand, the peak intensity stayed almost constant when the inflow rate increased from 10 to 50 ml/min. With the increase in the inflow rate from 2 to 10 ml/min, the specific surface area of the particles decreased by approximately 20 %. On the contrary, the specific surface area stayed constant when the inflow rate increased from 10 to 50 ml/min.

• Asia pacific journal of information systems
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• 제9권1호
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• pp.143-163
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• 1999

This study investigates the effect of group size on group performance, here the quality of group decision, Four effects are proposed and tested in a field experimental setting : (1) the relationship between the group size and the distribution of individual's problem-solving ability ; (2) the change of the group decision quality as group size increases ; (3) the relationship between the group decision quality and the quality of the best/worst member as group size increases ; (4) the relationship between the group decision quality and the average quality of individuals in the group as group size increases. Data showed that contrary to the exiting results, group decision quality was not improved with the group size. Rather, it showed a little tendency that group decision quality was worsened with the group size. Data also showed that consensus-oriented group decision making process produced the compromised output. Thus, group decision quality was not better than the average group members'. The opinion of the best member was not accepted. The implications of the findings are discussed for the development of a Korean GSS.

• 한국가축번식학회지
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• 제22권4호
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• pp.367-373
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• 1998

본 조사 연구는 사육규모에 따른 한우 번식우의 초종부, 초임 및 초산일령과 분만 후 발정재귀일수, 수태당 종부회수, 분만 후 수태일수, 분만간격 등을 검토하기 위하여 1996년 1월부터 1997년 12월까지 20농가에서 사육중인 한우 성빈우 670두를 대상으로 조사를 수행하였다. 1. 사육규모에 따른 한우 미경산우의 초종부일령은 평균 443.0일이었고 사육규모별로는 1규모, 2규모 및 3규모가 각각 437.9일, 425.5일 및 452.9일로 사육규모간에 유의적인 차이는 인정되지 않았다 (p＞0.05). 2. 사육규모에 따른 한우 미경산우의 초임일령은 평균 460.0일이었고 사육규모별로는 1규모, 2규모 및 3규모가 각각 452.8일, 438.4일 및 467.1일로 사육규모간에 유의적인 차이는 인정되지 않았다(p＞0.05). 3. 사육규모에 따른 한우 미경산우의 초산일령은 평균 746.6일이었고 사육규모별로는 1규모, 2규모 및 3규모가 각각 741.2일, 730.2일 및 755.9일로 사육규모간에 유의적인 차이는 인정되지 않았다(p＞0.05). 4. 사육규모에 따른 분만후 발정재귀일수는 평균 70.1일이었고 사육규모별로는 l규모, 2규모 및 3규모가 각각 82.1일, 74.1일 및 64.8일로 3규모가 가장 짧았고 1규모가 가장 긴 경향을 나타내었다(p＜0.05). 5. 사육규모에 따른 수태당 종부회수는 평균 1.53회였고 사육규모별로는 1규모, 2규모 및 3규모가 각각 1.54회, 1.61회 및 1.48회로 사육규모간에 유의적인 차이는 인정되지 않았다 (p＞0.05). 6. 사육규모에 따른 분만 후 수태일수는 평균 91.2일이었고 사육규모별로는 1규모, 2규모 및 3규모가 각각 115.6일, 99.1일 및 80.6일로 규모가 증가함에 따라 짧아지는 경향을 나타내었다 (p＜0.05). 7. 사육규모에 따른 분만간격은 평균 375.3일이었으며, 사육규모별로는 1규모, 2규모 및 3규모가 각각 389.5일, 383.0일 및 367.4일로 3규모가 가장 짧았고 1규모가 가장 긴 경향을 나타내었다 (p<0.05).

• 대한전자공학회논문지TC
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• 제48권5호
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• pp.46-53
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• 2011

유한한 기판크기가 E-평면으로 배열된 선형 위상 배열 안테나의 방사 특성에 미치는 영향을 연구하였다. 여러 가지 기판 크기에 따른 active reflection coefficient 와 average active element pattern 으로부터 선형 배열안테나의 방사특성을 예측하였다. E-평면과 만나는 기판 가장자리까지의 거리 변화가 H-평면과 만나는 기판 가장자리까지의 거리 변화에 비해 위상 배열 안테나의 방사 패턴 특성에 미치는 영향이 큰 것을 알 수 있었다.

• 한국의류학회지
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• 제48권2호
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• pp.350-366
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• 2024

This study aimed to clarify the continuance intention of users of size recommendation services. The expectation-confirmation model framed the analysis of the 180 data points collected. The analysis determined the mediating effects of perceived usefulness and satisfaction on the relationship between expectation-confirmation and continuance intention. The moderated mediation effect of familiarity was also analyzed, and a path analysis was conducted using PROCESS macro. Results showed that expectation-confirmation had a significant effect on perceived usefulness, satisfaction, and continuance intention. Findings indicated that perceived usefulness affected satisfaction and continuance intention and confirmed that satisfaction affected continuance intention. In the relationship between expectation-confirmation and continuance intention, mediation analysis verified the mediation and double mediation of perceived usefulness and satisfaction. In the group with an above-average familiarity value, moderation analysis confirmed a moderating effect between perceived usefulness and satisfaction. Above-average familiarity values also confirmed that the moderating effect on continuance intention was significant.

• 한국임상수의학회지
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• 제27권1호
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• pp.46-49
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• 2010

In this study, we investigated the number of follicles, oocyte recovery rate and oocyte competence after in vitro maturation according to the size of follicle. And equine oocyte competence after in vitro maturation was investigated in terms of the diameter of follicle with criteria of maturation: nuclear stage after Hoechst staining. The average number of follicles per ovary with middle size (11-20 mm, 2.68) was higher than those of small (5-10 mm, 0.74) and large size follicle (> 21 mm, 1.63), therefore medium follicle (53.1%) had higher proportion than other size of follicles. The average numbers of follicle per ovary was 5.05. The rate of oocyte recovery in small (54.5%) and middle follicle (50%) was higher than that in large follicle (40.9%). After culture for 48 h in Medium 199, 50%, 45.5%, and 44.4% of oocytes from the follicles with diameters of 5-10, 11-20, > 21 mm, respectively reached the metaphase II stage. This is the first report showing number of follicle, oocyte recovery rate according to follicular size, and in vitro oocyte maturation in Jeju mare in Korea. To fulfill in vitro equine embryo production, further studies such as the seasonal effect, in vitro fertilization etc is need.

• 산업기술연구
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• 제20권B호
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• pp.3-8
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• 2000

Low cycle fatigue life of spheroidal graphite cast iron is determined by the morphological parameters of internal graphite. The aim of this study is to clarify the effect of the number of nodular grain of spheroidal graphite cast iron on low cycle fatigue life. Two specimens that have identical average nodular grain size by changing nodular grain volume fraction and different number of nodular grain count was tested. In this paper, the parameter governing fatigue life through fatigue test, the number of nodular grain seriously affect fatigue life and nodular grain size is no longer governing parameter of it.

• 정보교육학회논문지
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• 제18권2호
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• pp.317-324
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• 2014

본 연구에서는 교육용 프로그래밍 언어를 사용한 프로그래밍 교육의 효과에 관한 국내 논문을 메타분석하여 프로그래밍 교육의 효과를 분석한다. 프로그래밍 교육의 효과에 관한 논문 가운데 메타분석이 가능한 논문 70편의 101개 연구를 대상으로 메타분석을 한 결과 평균 효과크기는 0.641로 긍정적인 효과를 보였다. 인지적 영역의 학습 효과를 위한 연구와 정의적 영역의 학습 효과를 위한 연구의 평균 효과크기는 각각 0.632, 0.666이었다. 실험 대상의 학령, 실험 차시, 사용 언어의 중재변인별 평균 효과크기에는 통계적으로 유의미한 차이가 없었다. 본 연구의 결과로부터 프로그래밍 교육을 받은 실험집단은 프로그래밍 교육을 받지 않은 통제집단에 비하여 약 23.9%의 긍정적인 효과의 향상을 보인다는 것을 알 수 있다.