• Korean Journal of Fisheries and Aquatic Sciences
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• v.14 no.3
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• pp.171-178
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• 1981

The growth of Sebastes alutus was studied by scale reading to check the change of growth rate at the early stage of life. Lee's phenomenon was recognized on the scale measurements except thc first ring radius. No evidence was found to support the change of growth rate at early stage. Von Bert-alanffy's growth equation was estimated with the back-calculated fork lengths, $1_t=357.8(1-e^{-0.6124(t+1.8566)}),\;and\;W_{\infty}=784.4g$

• Korean Journal of Human Ecology
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• v.18 no.3
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• pp.705-717
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• 2009

본 연구의 목적은 미국 여대생의 자의식, 물질주의성향, 충동구매와 과시적 소비성향간의 관계에 관하여 조사하는데 있다. 상징적 자기완성이론을 이론적 근거로 하여 가설을 설계하였으며, 설문지 조사법을 이용하여 자료를 수집하였다. 편의표본추출법을 적용하여 미국 중서부지역의 한 대학교의 여대생 315명을 연구대상으로 설문조사를 하였으며, 최종적으로 296명의 응답을 연구결과분석에 이용하였다. Stepwise 회귀분석을 통한 분석 결과 공적 자의식은 물질주의성향과 충동구매성향 및 과시소비성향에 정적 영향을 미치는 것으로 나타났으며, 사적 자의식은 과시소비성향에 부적 영향을 미치는 것으로 나타났다. 또한, 단순회귀분석을 통한 분석 결과 물질주의성향과 충동구매성향 및 과시적 소비 성향 간에 정적인 관계가 있는 것으로 나타났다. 본 연구는 자의식, 물질주의성향, 충동구매와 과시소비 성향간의 관계 메커니즘을 증명해 보임으로써, 사회 심리학적 소비자 행동연구에 이론적 틀을 제시하였다. 또한, 본 연구결과는 미국 여대생을 표적 시장으로 하는 기업이 표적소비자의 소비행동과 심리를 이해하는데 중요한 자료로 이용될 것으로 기대된다.

• Survey Research
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• v.3 no.2
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• pp.77-90
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• 2002

This study reports the results of a random sampling telephone survey conducted in the case of the Ulsan mayoral election 2002. We interview at least five times to a respondent who is randomly selected by means of the birthday method from a randomly sampled telephone number list of 1,233 households, We analyze the result of interviewing, such as absence and promise. And we compare the demographic variables of the surveyed sample and those of the population and we also compare the randomly selected sample's voting preference with outcome of the election in various ways. Finally, we discuss difficulty of random sampling with the birthday method and suggest some technical tips to conduct random sampling telephone survey.

• Journal of Cadastre & Land InformatiX
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• v.46 no.1
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• pp.87-100
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• 2016

The acquisition of the forest resource information has depended on a partial sampling method or aerial photographs which demand a lot of effort and time because of the vast areas and the difficult approach. For the acquisition of the forest resource information, there have been the optical remote-sensing and the multi-spectrum image to offer only horizontal distributions of trees, but a new technological approach, such as Airborne LiDAR, is more necessary to acquire directly three dimensional information related to the forest terrains and trees' features. This paper proposes an algorithm for the forest information extraction such as trees' individual numbers and the heights of trees by using LiDAR data. Especially, this proposed algorithm adopts a region growing method for the extraction of the vegetation-point and extracts the forest information using morphological features of trees.

• Journal of the Korean Association of Geographic Information Studies
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• v.20 no.3
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• pp.181-194
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• 2017

This study aims to develop a regression model for forest volume estimation using field-collected forest inventory information and airborne LiDAR data. The response variable of the model is forest stem volume, was measured by random sampling from each individual plot of the 30 circular sample plots collected in Bonghwa-gun, Gyeong sangbuk-do, while the predictor variables for the model are Height Percentiles(HP) and Height Bin(HB), which are metrics extracted from raw LiDAR data. In order to find the most appropriate model, the candidate models are constructed from simple linear regression, quadratic polynomial regression and multiple regression analysis and the cross-validation tests were conducted for verification purposes. As a result, $R^2$ of the multiple regression models of $HB_{5-10}$, $HB_{15-20}$, $HB_{20-25}$, and $HBgt_{25}$ among the estimated models was the highest at 0.509, and the PRESS statistic of the simple linear regression model of $HP_{25}$ was the lowest at 122.352. $HB_{5-10}$, $HB_{15-20}$, $HB_{20-25}$, and $HBgt_{25}-based$ models, thus, are comparatively considered more appropriate for Korean forests with complicated vertical structures.

• Culinary science and hospitality research
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• v.18 no.1
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• pp.104-119
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• 2012

The purpose of this study is to suggest a way of the efficient operation of university foodservice through the Importance-Performance Analysis and examine a causal relationship between selection attributes and satisfaction. A survey was carried out in class, and after excluding 12(A University) and 20(B University) unusable cases which had an unacceptable level of missing data, 108 out of 120(A University) and 104 out of 124(B University) cases were used for analysis. As for A University, IPA showed that taste, variety, food cleanliness, table cleanliness, and tableware cleanliness were included in the concentrating efforts items. As for B University, IPA showed that taste, variety, and table cleanliness were in the concentrating efforts items that university foodservice managers should improve. Also, through t-test difference analysis on selection attributes of A University and B University in the research model, this study confirmed that both A University and B University displayed positive difference in personal services. And, through regression analysis, food quality had a positive influence on satisfaction.

• 한국노년학
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• v.38 no.2
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• pp.291-308
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• 2018

The purpose of this study is to analyze the factors influencing financial preparedness for retirement of the middle-aged North Korean defectors (resettling in South Korea) using concepts of 'financial literacy' and 'financial inclusion'. Those questioned were 100 North Korean defectors of 40-60 years-old residing in Seoul and Gyeonggi-do Province selected by convenience sampling, one of the non-probability sampling. Path analysis is used as a main analysis method. The results of the study show a direct effect in which increased financial literacy resulted in better financial preparedness for retirement among middle-aged North Korean defectors at a statistically significant level. In addition, by boost-trapping method, financial inclusion has its mediating effect on the relationship between financial literacy and financial preparedness for retirement. However, this study shows that influence of financial literacy on financial preparedness for retirement is different across economic statues. The mediating effect of financial inclusion on the relationship between financial literacy and financial preparedness is statistically significant only for the low-income group. Meanwhile, for the above average income group, financial literacy has a direct effect on the financial preparedness after retirement at a statistically significant level. Based on these results, this study suggests practical and policy implementation such as necessity of customized financial education suited to their economic status, development of financial instruments for retirement, introduction of financial social workers to prepare stable old age of North Korean defectors.

• Economic and Environmental Geology
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• v.54 no.2
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• pp.259-269
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• 2021

The effects of the physicochemical properties of soil such as soil pH, cation exchange capacity, and organic matter content on single extraction of Cd, Cr, Cu, Ni, Pb, and Zn using CaCl2, HOAc, HNO3, and DTPA were statistically investigated for 69 agricultural soils in Korea. Correlation analysis and multiple regression analysis were applied for soil samples which were grouped on the basis of average values of the physicochemical properties of the soil. Diluted HNO3 extracted higher concentrations of Cr, Cu, Ni, and Pb when compared with the other extractants, however, similar amounts of Cd and Zn were extracted by HOAc with HNO3. The results of correlation analysis indicated that DTPA extraction showed a high correlation with other single and pseudo-total extraction methods, and the physicochemical properties of soil influenced the concentrations of heavy metals leached by the single extraction methods. In the case of Zn, high correlations between pseudo-total and the studied single extraction methods were observed. As a result of regression analysis, it was found that the physicochemical properties of the soil could explain up to 74% of variances of the single extraction results. These results indicate that the physicochemical properties of the soil can have a direct influence on the concentrations of heavy metals extracted by the single extraction methods.

• The Journal of the Korea Contents Association
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• v.14 no.9
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• pp.450-462
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• 2014

The main purpose of this study was to explore the causal relationships among transactional leadership, coaches' emotional intelligence, and athlete satisfaction in soccer teams. High school, university, and semi-professional soccer players(N=495) in Korea participated in a survey. Transactional leadership inventory, emotional intelligence test, and athlete satisfaction questionnaire previously developed to investigate was performed to utilize. The data were analyzed by structural equation model of the AMOS 18.0. The results were as follows; transactional leadership have meaningful influence on emotional intelligence and athlete satisfaction, and emotional intelligence have significant influences on athlete satisfaction. The mediating effect of leader's emotional intelligence between transactional leadership and athlete satisfaction was confirmed. Findings of this study can enhance our understanding of the emotional leadership to increase athlete satisfaction in Soccer players.

• 한국노년학
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• v.29 no.1
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• pp.89-99
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• 2009

This study aims to identify the influence of the satisfaction of the elderly with their participation in fitness on the expectation of support and family function. First, overall satisfaction and satisfaction with service quality out of satisfaction factors with the participation in fitness significantly affected family cohesion and family adaptability, and they significantly affected family adaptability in psychological satisfaction factors. Second, all of the sub-factors of the satisfaction with the participation in fitness significantly affected the expectation of support. Third, the satisfaction with fitness of the elderly directly affected family cohesion and family adaptability, which posted .162 and .239 respectively. Plus, the satisfaction with the participation in fitness indirectly affected the expectation of support, which posted .032 and directly affected the expectation of support, which posted .722. Also, family cohesion directly affected the expectation of support, which posted -.101, and family adaptability directly affected the expectation of support, which posted .201.