• 정보관리학회지
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• 제27권4호
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• pp.239-258
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• 2010

이 연구에서는 특허의 인용에 영향을 미치는 주요 변수들을 토대로 특허의 피인용횟수를 예측하기 위한 모형을 제시하였다. 이를 위해 미국특허를 대상으로 5개 주제분야에 걸쳐 특허의 피인용횟수와 일정 수준 이상의 상관관계, 즉 5% 이상의 설명력을 갖는 것으로 밝혀진 페이지 수, 청구항 수, 참고문헌 평균 피인용횟수, 서지결합도, 문헌간유사도 등 5개 변수들을 토대로 다중회귀분석을 실시하였다. 연구결과에 따르면, 제시된 5개 주제분야의 특허인용 예측모형의 설명력은 주제분야에 따라 58.3%~89.6%로 나타났으며, 예측변수로 사용된 5개의 독립변수 중 특허 피인용횟수에 가장 영향력이 높은 변수는 '문헌간 유사도'로 나타났다. 또한 이 연구에서 추정된 주제분야별 예측모형을 토대로 산출한 특허 피인용횟수에 대한 예측값과 실제값을 비교한 결과 이들 예측모형은 5개 주제분야에서 모두 적합한 것으로 나타났다.

• 한국콘텐츠학회논문지
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• 제9권6호
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• pp.196-206
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• 2009

병원의 수익성이란 병원이 회계년도 기간동안 환자 진료 및 기타 경영활동을 통해 달성한 경영성과를 말한다. 본 연구는 병원의 수익성 측정 지표로 병원을 운영하여 얻은 의료수익에서 의료비용을 뺀 순수한 의료이익인 의료수익의료이익율을 사용하였다. 이를 통해 수익성에 영향을 미치는 다양한 지표를 대상으로 병원 수익성 관련 요인을 도출하였다. 이 결과를 토대로 병원의 수익성 제고 방안을 강구할 수 있는 보다 유용한 기초자료를 산출하고자 하였다. 분석결과 공공병원이 민간병원보다 수익성이 낮았다. 각 지표의 수익성을 적자병원군과 흑자병원군으로 구분하여 분석한 결과 인건비 비율, 관리비 비율, 전문의 1인당 수술건수, 의료장비 회전율와 관련한 지표에서 유의한 차이를 보였다. 관련 지표가 수익성에 미치는 영향을 보면 모형에 따라 설명력은 25%-74.5%였다.

• Journal of Preventive Medicine and Public Health
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• 제52권6호
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• pp.355-365
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• 2019

Objectives: In rural areas of Korea, where public transportation infrastructure is lacking and alternative systems are poor, the elderly experience inconveniences in using healthcare, although their need is high. This study aimed to analyze the association between the convenience of transportation and unmet healthcare needs among the rural elderly. Methods: The data used were collected in the 2016 Community Health Survey among rural elderly individuals aged 65 or older. Dependent variable was the unmet healthcare needs, explanatory variable was the convenience of transportation. The elderly were divided into 3 groups: with no driver in the household, with a driver, and the elderly individual was the driver (the self-driving group). Covariates were classified into predisposing, enabling, and need factors. They included gender, age, education, income, economic activity, household type, motor ability, subjective health level, number of chronic diseases, anxiety/depression, and pain/discomfort. The data were analyzed using logistic regression and stratification. Results: A significant association was found between the convenience of transportation and unmet healthcare needs. When examined unadjusted odds ratio of the group with a driver in the household, using the group with no driver as a reference, was 0.61 (95% confidence interval [CI], 0.54 to 0.68), while that of the self-driving group was 0.34 (95% CI, 0.30 to 0.38). The odds ratios adjusted for all factors were 0.69 (95% CI, 0.59 to 0.80) and 0.79 (95% CI, 0.67 to 0.91). Conclusions: We confirmed a significant association between inconvenient transportation and unmet healthcare needs among the rural elderly even after adjustment for existing known factors. This implies that policies aimed at improving healthcare accessibility must consider the means of transportation available.

• 한국방사선학회논문지
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• 제15권2호
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• pp.131-137
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• 2021

본 연구는 임신초기 초음파 선별검사에서 태아의 후뇌 정중면을 이용하여 태아의 두개내투명대 기준 값을 제시하고 임상적인 의의를 찾고자 하였다. 2018년 8월부터 2020년 2월까지 I 병원 정기검진을 받는 산모들 중 머리엉덩길이 40.6 mm에서 78.3 mm에 해당되는 단태아 1529명의 두개내투명대를 측정하여 후향적으로 분석하였다. 회귀분석에서 머리엉덩길이가 증가할수록 두개내투명대는 54.3%의 설명력을 보이며 증가하는 경향을 보였다(P<0.001). 또한 빈도분석을 통해 임신주수별 두개내투명대의 백분위수 기준치를 산출하였다. 결과적으로 태아 두개내투명대의 한국인 기준치를 마련할 수 있었으며 임신초기 태아 후뇌의 평가에 있어서 척추이분증의 보조적 선별검사로 유용하게 적용될 것이다.

• Nutrition Research and Practice
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• 제17권5호
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• pp.959-968
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• 2023

BACKGROUND/OBJECTIVES: Few studies have provided evidence of the association between diet quality and dental caries. This study aimed to examine the association between diet quality and untreated dental caries in a Korean representative population. SUBJECTS/METHODS: The study population included a sample of 13,815 participants, aged ≥ 19 from the Korea National Health and Nutrition Examination Survey during 2013-2015. The explanatory variable was diet quality and the outcome variable was untreated dental caries. Untreated dental caries were defined by the number of decayed teeth recorded according to the criteria established by the World Health Organization. Diet quality was defined by using the Korean Healthy Eating Index (KHEI) through the 24-h recall methods. We assessed the association between diet quality and untreated dental caries while adjusting for age, sex, education, income, smoking status, dental visits, toothbrushing frequencies, obesity, and diabetes mellitus. RESULTS: The mean overall KHEI scores in the untreated dental caries group were significantly lower than those in the group without untreated dental caries. Significant differences were observed in the untreated dental caries group based on the KHEI quartiles (P < 0.001). After adjusting for potential confounders, the quartiles of KHEI scores showed an association with untreated dental caries, demonstrating a dose-effect trend (odds ratio [OR], 1.57; 95% confidence interval [CI], 1.35-1.84 for 1st quartile; OR, 1.38; 95% CI, 1.19-1.59 for 2nd quartile; OR, 1.32; 95% CI, 1.14-1.53 for 3rd quartile; reference quartile highest]). CONCLUSIONS: The findings indicated an inverse association between diet quality and untreated dental caries in Korean adults. Healthcare providers should take into account the significant role of diet quality in preventing and managing oral health.

• 한국지진공학회논문집
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• 제22권6호
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• pp.323-332
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• 2018

Recent two moderate earthquakes (2016 $M_w=5.4$ Gyeongju and 2017 $M_w=5.5$ Pohang) in Korea provided the unique chance of developing a set of relations to estimate instrumental seismic intensity in Korea by augmenting the time-history data from MMI seismic intensity regions above V to the insufficient data previously accumulated from the MMI regions limited up to IV. The MMI intensity regions of V and VI was identified by delineating the epicentral distance from the reference intensity statistics in distance derived by using the integrated MMI data obtained by combining the intensity survey results of KMA (Korea Meteorological Administration) and 'DYFI (Did You Feel It)' MMIs of USGS. The time-histories of the seismic stations from the MMI intensity regions above V were then preprocessed by applying the previously developed site-correction filters to be converted to a site-equivalent condition in a manner consistent with the previous study. The average values of the ground-motion parameters for the three ground motion parameters of PGA, PGV and BSPGA (Bracketed Summation of PGA per second for 30 seconds) were calculated for the MMI=V and VI and used to generate the dataset of the average values of the ground-motion parameters for the individual MMIs from I to VI. Based on this dataset, the linear regression analysis resulted in the following relations with proposed valid ranges of MMI. $MMI=2.36{\times}log_{10}(PGA(gal))+1.44$ ($I{\leq}MMI$$MMI=2.44{\times}log_{10}(PGV(kine))+4.86$ ($I{\leq}MMI$$MMI=2.59{\times}log_{10}(BSPGA(gal{\cdot}sec))-1.02$ ($I{\leq}MMI$

• 유통과학연구
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• 제14권1호
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• pp.93-102
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• 2016

Purpose - The purpose of paper is studying the static and dynamic side for long-term memory storage properties, and increase the explanatory power regarding the long-term memory process by looking at the long-term storage attributes, Korea Composite Stock Price Index. The reason for the use of GPH statistic is to derive the modified statistic Korea's stock market, and to research a process of long-term memory. Research design, data, and methodology - Level shifts were subjected to be an empirical analysis by applying the GPH method. It has been modified by taking into account the daily log return of the Korea Composite Stock Price Index a. The Data, used for the stock market to analyze whether deciding the action by the long-term memory process, yield daily stock price index of the Korea Composite Stock Price Index and the rate of return a log. The studies were proceeded with long-term memory and long-term semiparametric method in deriving the long-term memory estimators. Chapter 2 examines the leading research, and Chapter 3 describes the long-term memory processes and estimation methods. GPH statistics induced modifications of statistics and discussed Whittle statistic. Chapter 4 used Korea Composite Stock Price Index to estimate the long-term memory process parameters. Chapter 6 presents the conclusions and implications. Results - If the price of the time series is generated by the abnormal process, it may be located in long-term memory by a time series. However, test results by price fixed GPH method is not followed by long-term memory process or fractional differential process. In the case of the time-series level shift, the present test method for a long-term memory processes has a considerable amount of bias, and there exists a structural change in the stock distribution market. This structural change has implications in level shift. Stratum level shift assays are not considered as shifted strata. They exist distinctly in the stock secondary market as bias, and are presented in the test statistic of non-long-term memory process. It also generates an error as a long-term memory that could lead to false results. Conclusions - Changes in long-term memory characteristics associated with level shift present the following two suggestions. One, if any impact outside is flowed for a long period of time, we can know that the long-term memory processes have characteristic of the average return gradually. When the investor makes an investment, the same reasoning applies to him in the light of the characteristics of the long-term memory. It is suggested that when investors make decisions on investment, it is necessary to consider the characters of the long-term storage in reference with causing investors to increase the uncertainty and potential. The other one is the thing which must be considered variously according to time-series. The research for price-earnings ratio and investment risk should be composed of the long-term memory characters, and it would have more predictability.

• 한국지구과학회지
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• 제28권7호
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• pp.811-824
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• 2007

사진과 삽화는 현행 과학 교과서에서 핵심적인 시각적 표상 요소이다. 본 연구에서는 6차와 7차 교육과정에 따른 고등학교 지구과학 교과서에 사용된 사진과 삽화의 기능 및 구조를 비교 분석하였다. 기능 분석 결과, 6차와 7차 모두 예시적 기능이 차지하는 비율이 압도적으로 높았으며, 보충적 기능의 비율이 가장 낮았다. 7차의 경우 사진과 삽화의 기능들이 6차에 비해 다양해졌는데, 이것은 지구과학 II 보다는 I에서 보다 두드러지게 나타났다. 특히, 6차에서는 극히 미미하게 나타났던 보충적 기능과 설명적 기능이 7차에서는 증가하였으며, 장식적 기능 또한 전반적으로 증가한 것으로 분석되었다. 구조 분석 결과, 6차에 비해 7차에서 참조가 현저하게 감소하여 본문과의 연계성 면에서 오히려 퇴보한 것으로 분석되었다. 단독 사진이나 삽화에 비해 다중 구성의 비율이 증가한 것으로 나타났으나, 짝이나 연속 구성에서는 발전된 점이 나타나지 않았다. 앞으로의 과학 교과서 개발에서 사진과 삽화의 기능에서 탐구적 기능을, 구조에서 보완적 구성을 추가할 것과 사진과 삽화를 포함한 시각적 표상의 기능과 구조 측면을 과학 교과서 검정 준거로 활용할 것을 논의하였다.

• 생물환경조절학회지
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• 제5권2호
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• pp.174-186
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• 1996

This study was carried out in order to understand the plan, design, constructing and actual condition of management of modernized horticultural facilities in Kyungpook Province which had been constructed from 1992 to 1995 funded by Government support. The aim of this study is to provide reference data for success of the forth project. It was performed by making up a question about driving of project and management condition of equipment after constructing. The results obtained from this study are as follows: 1. 73.5% of facilities horticulture farmhouse recognized that the prospect of greenhouse is bright, but 92.5% of the farmhouse also recognised that they need technical consultation on protected horticulture farming. Therefore, technical educations would must be enhanced about foundation of greenhouse and cultivation technique. 2. The holding times of explanatory meetings, cause of understanding to farmhouse, were one or two times in greenhouse construction, and 62.5% of the farmhouse expressed the insufficiency at the explanation and educational data. For this reason, it was judged that the construction contract had been delayed more than 5 months in 49.3% of the farmhouse after the decision of project budget. 3. In constructing after a contract, the rates of construction delay is 53.4% and defect occurrence is 41.1%. The biggest reasons of construction delay was insufficiency of worker and materials supply. Each percentage is 29.1%. And the reason of defect occurrence is badness of machinery equipment(62.9% ). 4. In management of greenhouse, a pipe-constructed plastic film greenhouse changes plastic film every one and three years because of sticking dust on plastic film. It was needed to about in cleaning technique of coverings. Because that used 3-5 years only half of the expected life span. 5. The order of broken rating in the subsidiary equipment is like this lollop ventilator (42.8%), a general control system(33.3%) especially, in the case of a general control system, the rate of all family can control is 52.7%. so, it is time to develop easy control equipment which every one could use as soon as possible. 6. When choose heat generator as decide capacity, the most priority is the mount of heat generator the percent is 45.5% heat generator and as decide model, the private purchase's percent is 77.3%. It is higher than a public bidding heat generator the percent is 22.7% heat generator when it compare with a public bidding. In the case of $CO_2$ generator, using rate is only 19.0%. The using rate is very low, so it needs education how to use depends on the way of the subsidiary equipment. 7. In the case of seedlings, it is asked to use factory-processed seedling effectively. because it's difficult to get security of labors(58.8%), hoped crops (55.9%) access same crops(29.4%) much more and changing of crops depends on market situation. that is the main reason the lack of knowhow.

• 한국콘텐츠학회논문지
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• 제19권4호
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• pp.403-412
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• 2019

최근 최저임금 인상 속도조절을 두고 자영업자와 근로자들 간에 논쟁이 제기되고 있다. 최저임금 인상이라는 재분배정책에 대해서는 물질적 자기이해관계에 따라 대립과 갈등이 존재한다. 따라서 본 연구에서는 물질적 자기이해관계 중 노동시장 내에서의 지위, 즉 자영업자인지 여부에 따라 최저임금 인상 속도 선호에 차이가 있는지를 분석하고자 하였다. 또한 같은 자영업자일지라도 최저임금 인상에 따른 비용을 어느 정도 감수할 수 있느냐에 따라 그 인상속도에 대한 선호에 차이가 있을 것으로 가정하여 소득 계층의 조절효과를 분석하였다. 이를 위해 일자리정책에 대한 설문데이터를 기반으로 한 다항 로짓모형을 활용하였다. 그 분석결과, 자영업자는 기준범주인 '인상 최소화'에 비해 '완만한 인상'과 '신속한 인상'을 덜 선호하는 것으로 나타났다. 다음으로 자영업자의 소득수준이 중산층에 해당하면 최저임금 인상에 대한 부정적 선호가 약화되는 것으로 나타났다. 본 연구의 시사점은 최저임금 인상 속도에 불만이 강한 영세자영업자의 소득을 보전해 주는 것이 사회적 갈등을 줄이는 처방될 수 있다는 점이다.