• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제46권2호
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• pp.133-142
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• 2020

Objectives: In this study, we determined the incidence and pattern of screw loosening in patients who received dental implants. Materials and Methods: Patients who received implants between January 2008 and October 2013 and completed their prosthetic rehabilitation were evaluated for the incidence, frequency, and onset of screw loosening using dental charts and radiographs. The association between each factor and screw loosening was analyzed using the chi-square test and a multivariate analysis with binary logistic regression models (P<0.05). Results: Total 1,928 implants were placed in 837 patients (448 males, 389 females), whose follow-up period after loading varied from 0.25 to 70 months (mean period, 31.5 months). Screw loosening occurred in 7.2% of implants. Most cases occurred less than six months after loading. Among those, 22.3% experienced recurrent screw loosening. Screw loosening was most common in the molar region (8.5%) and frequently associated with an implant diameter of ≥5 mm (14.2%). External implant-abutment connections (8.9%) and screw-retained implant prostheses (10.1%) showed higher incidence of problems than internal implant-abutment connections and cement-retained implants, respectively. Screw loosening was most common in implant prostheses with single crowns (14.0%). Conclusion: Within the limits of the current study, we conclude that the incidence of screw loosening differs significantly according to the position of implant placement, the type of implant and manufacturer, implant diameter, the type of implant-abutment connection, the type of retention in the implant prosthesis, and the type of implant prosthesis.

• Journal of Periodontal and Implant Science
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• 제52권3호
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• pp.194-205
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• 2022

Purpose: This study aimed to determine the long-term outcomes after peri-implantitis treatment and the factors affecting these outcomes. Methods: This study included 92 implants in 45 patients who had been treated for peri-implantitis. Clinical data on the characteristics of patients and their implants were collected retrospectively. The change in the marginal bone level was calculated by comparing the baseline and the most recently obtained (≥3 years after treatment) radiographs. The primary outcome variable was progression of the disease after the treatment at the implant level, which was defined as further bone loss of >1.0 mm or implant removal. A 2-level binary logistic regression analysis was used to identify the effects of possible factors on the primary outcome. Results: The mean age of the patients was 58.7 years (range, 22-79 years). Progression of peri-implantitis was observed in 64.4% of patients and 63.0% of implants during an observation period of 6.4±2.7 years (mean±standard deviation). Multivariable regression analysis revealed that full compliance to recall visits (P=0.019), smoking (P=0.023), placement of 4 or more implants (P=0.022), and marginal bone loss ≥4 mm at baseline (P=0.027) significantly influenced the treatment outcome. Conclusions: The long-term results of peri-implantitis treatment can be improved by full compliance on the part of patients, whereas it is impaired by smoking, placement of multiple implants, and severe bone loss at baseline. Encouraging patients to stop smoking and to receive supportive care is recommended before treatment.

• 한국항해항만학회지
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• 제47권4호
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• pp.202-211
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• 2023

국내 해양사고에서 어선의 충돌사고는 타 선종보다 빈번하고 사고 심각도는 높은 편에 속한다. 과거 큰 피해를 불러온 국내 어선충돌사고의 시사점은 어선이 충돌 직전까지 높은 항행 속력을 유지하고 있었다는 것과 어선이 규모 차이가 큰 선박과 충돌하였다는 점에 있다. 본 논문에서는 어선의 충돌사고 결과로 나타나는 선박피해 심각도를 선박의 속력과 분석하여 상관관계를 확인하는 연구를 하였다. 이를위해 도로교통분야에서 활용되고 있는 유효충돌속도(Effective Impact Speed)라는 개념을 두 선박의 충돌상황에 적용하였고 2016년부터 2022년까지 해양사고 재결서 중 어선과 어선, 어선과 비어선 충돌사고 데이터를 수집하여 총 617척 선박의 유효충돌속도를 산출하였다. 분석된 데이터를 바탕으로 유효충돌속도를 독립변수, 선박피해 심각도를 종속변수로 하는 이항 및 다항 로지스틱 회귀분석을 수행하여 두 변수의 상관성을 살펴보았다. 분석결과 유효충돌속도와 선박피해 심각도가 서로 통계적으로 유의하다는 것과 선박피해심각도는 유효충돌속도와 함께 선박의 질량에도 큰 영향을 받는다는 것을 확인할 수 있었다.

• 한국치위생학회지
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• 제15권1호
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• pp.111-118
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• 2015

Objectives: The aim of the study is to investigate the health belief model affecting the oral health behavior in middle and high school students. Methods: The subjects were 296 middle and high school students in Seoul, Gyeonggi and Incheon from February 15 to March 21, 2014. The students filled out the self-reported questionnaires after receiving informed consents. The instrument was adopted and revised from those of Kim & Hwang, and Choi & Joo. The questionnaire consisted of 4 questions of general characteristics, 9 questions of oral health status including subjective oral health status, frequency of tooth brushing, duration of tooth brushing, method of tooth brushing, use of oral health devices, dental clinic visit, scaling services, snack intake, and smoking. The oral health belief consisted of 25 questions including susceptibility, seriousness, barriers, benefit, and self-efficacy using Likert 5 scale. The reliability of Cronbach's alpha in the study was 0.725. Data were analyzed using SPSS ver 18.0 for frequency analysis, t-test, ANOVA, ${\chi}^2$-test, and Pearson's correlation coefficient, simple regression, and binary logistic regression. Results: Oral health beliefs of middle and high school students affected the oral health behaviors. Susceptibility, barriers and self-efficacy also influenced on the oral health behaviors. In order to provide the best oral health education, susceptibility and self-efficacy are the primary factors to increase motivation because the motivation endows the students with correction of oral health behaviors that improve the knowledge, attitudes, and decrease barriers in oral hygiene. Conclusions: It is important to correct oral health behaviors in the middle and high school students by providing the continuing and systematic oral health education.

• 한국전문물리치료학회지
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• 제24권2호
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• pp.76-91
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• 2017

Background: Agricultural work is physically demanding and is associated with a high frequency of musculoskeletal disorders. It is challenging to comprehensively understand the present status of work-related diseases and injuries among farmers in underdeveloped countries. Objects: This study aimed to elucidate the current status of work-related musculoskeletal disorders in local farmers in Tigray, Ethiopia, and identify the agricultural factors associated work-related musculoskeletal pain (AFWMP) and healthy living and healthy behavior factors associated work-related musculoskeletal pain (HFWMP). Methods: The Institute for Poverty Alleviation and International Development at Yonsei University conducted a survey of 126 households in Tigray, Ethiopia in 2014. A total of 116 individuals (73 men, 43 women) representing each household answered the questionnaires. Results: 1) Work-related musculoskeletal pain (WMSP) most commonly occurred when performing heavy lifting and most frequently occurred in the lower back. 2) Age, self-perceived labor intensity, and months of farming work were significantly higher in the pain group than those in the non-pain group. 3) Overall work-related musculoskeletal pain intensity (WPI) showed positive and negative correlations with years of farming experience and self-perceived health status, respectively. 4) In binary logistic regression, the occurrence of WMSP showed significant associations with self-perceived labor intensity. 5) On multiple linear regression analysis, age, months of farming work, and self-perceived health status had a significant impact on overall WPI. Conclusion: The WMSP of farmers in Tigray, Ethiopia was related to the characteristics of farm working and health status. Furthermore, HFWMP and AFWMP were the chief factors affecting the occurrence of WMSP in farmers in Tigray. Therefore, both HFWMP and AFWMP should be considered for clinical health assessments of farmers with WMSP in underdeveloped African countries.

• 벤처창업연구
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• 제12권6호
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• pp.139-150
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• 2017

우리나라의 중소기업은 전체 사업체 수의 99.9%, 사업체 종사자 수의 87.9%를 차지하는 등 국가경제의 근간을 형성하고 있다. 하지만 대부분의 중소기업은 자금은 물론 연구인력, 연구시설 장비 등 기술개발(R&D)에 필요한 역량 확보에 상당한 어려움을 겪고 있다. 이러한 상황에서 출연연구기관과의 R&D협력은 새로운 기술과 신제품 개발에 필요한 과학기반 지식의 획득과 활용 등 중소기업의 기술혁신을 도모함으로써 기업이 기술력을 토대로 지속 성장하는데 중요한 전략적 수단이 될 수 있다. 이에 본 연구는 2016년 한국전자통신연구원(ETRI)의 산 연 기술협력 수요조사를 이용하여, 기업이 출연연구기관과 R&D협력을 하는데 영향을 미치는 기업의 특성요인을 분석하고, 기업의 기술역량과 산 연 R&D협력이 기술혁신 성과에 미치는 효과를 이분형 로지스틱 모형(Binary Logistic Model)으로 분석하였다. 분석 결과, 첫째로 기업의 기술역량과 관계적 특성이 출연연구기관과의 R&D협력을 강화할 가능성이 있음을 보였다. 둘째, 기업의 기술역량과 산 연 R&D협력은 제품혁신과 공정혁신 모두에서 긍정적인 효과가 존재함을 확인하였다. 따라서 중소기업이 기술혁신 성과를 달성하기 위해서는 출연연구기관과의 R&D협력과 내부 기술역량의 확보가 필요하며, 산 연 R&D협력의 활성화가 요구됨을 시사한다. 이러한 분석결과를 토대로 본 연구에서는 중소기업의 기술혁신 도모를 위한 출연연구기관의 역할 방향에 관한 시사점을 R&D협력 활성화 측면에서 제시한다.

• 한국안전학회지
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• 제25권6호
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• pp.169-179
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• 2010

The aim of this study was to investigate occupational and individual risk factors and working conditions in relation to musculoskeletal symptoms in street cleaners. Investigation was conducted through a survey of 395 male street cleaners employed by the government office in Seoul, Gyeonggi and Chung-Nam from July to August of 2009. The control group was comprised of 143 male drivers and security guards. Risk factors for musculoskeletal symptoms in street cleaners were investigated by multiple logistic regression analysis and also evaluated ergonomic risk factors by assessing working conditions of 4 street cleaners. As a result of symptom questionnaires, all of the prevalent rates of musculoskeletal symptoms in street cleaners had significantly higher results than those of the control group(p<0.05). On binary logistic regression analysis of musculoskeletal symptoms, street cleaners showed significant higher odds ratio as 18.84(95%CI: 6.56-54.12) in the arm/elbow, 10.49(95%CI: 4.29-25.65) in the hand/wrist compared to the control group. Both absence of rest breaks and exposure to ergonomic risk factors showed to be important internal risk factors of musculoskeletal symptoms among street cleaners. The exposure levels of QEC(Quick exposures checklist) in street cleaners were revealed to be higher on the shoulder/arm, wrist/hand, and neck than back, or from stress. The findings appear to show that street cleaners were high-risk group of work-related musculoskeletal disorders. Therefore street cleaners require a holistic interventional strategy, including adequate arrangement of rest breaks, improvement of working tools and control of individual risk factors such as obesity and smoking.

• 지역연구
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• 제37권3호
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• pp.19-36
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• 2021

우리나라의 대부분의 인구가 거주하는 수도권에서는 다양한 유형의 주거이동이 나타날 것을 예상할 수 있다. 특히 비대면 상황이 증가하는 시대에 중요한 요소로 떠오르고 있는 주거면적의 변화 역시 이동 방향에 따른 차이가 존재할 수 있고 영향요인 또한 다양하게 나타날 것이다. 따라서 이동 방향에 따른 주거면적의 상향, 하향과 영향요인의 분석은 인구 집중도가 높은 수도권 지역을 대상으로 하는 주택정책 방향성에 시사점을 제시 할 수 있을 것이다. 이에 본 연구는 수도권 내 이동방향에 따른 주거면적의 변화에 대한 영향요인을 비교 분석한다. 구체적인 연구질문은 다음과 같다. 첫째, 수도권 주거이동 방향에 따른 주거면적의 상향 및 하향에 차이가 있는가? 둘째, 수도권 주거 이동 방향에 따른 주거면적 상향 및 하향 영향요인에 차이가 있는가? 연구질문에 답하기 위해 2018년 주거실태조사를 활용하여 t-test와 이항 로지스틱 회귀분석을 활용하였다. 본 연구의 주요 분석결과는 다음과 같다. 첫째, 수도권 주거이동 방향에 따라서 주거면적의 상향 및 하향은 통계적으로 유의미한 차이가 있으며 경인지역에서 경인지역으로 이동했을 경우 주거면적의 상향을 경험한 가구가 많았다. 둘째, 주거 면적 상향 이동의 경우 이전 거주지가 서울인 경우가 많고, 하향 이동의 경우 경인지역에서 이동한 가구가 많다. 마지막으로 각 주거이동 방향별로 주거 면적 상향이동에 영향을 미치는 요인은 다르게 나타났다. 이러한 분석결과를 토대로 수도권 내 주거 면적의 상향 및 하향 이동에 대한 이론적, 정책적 함의를 제시한다.

• 보건행정학회지
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• 제28권4호
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• pp.369-377
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• 2018

Background: Catastrophic health expenditure (CHE) occurs when medical expenditure of a household passes over a certain ratio of household income. This research studied the effect of gender on CHE based on Korea Health Panel data. Methods: This study implemented binary logistic regression model to figure out whether gender affects CHE and how different gender groups show pattern of CHE process. With gender, age, marital status, income level, economic activity, membership of private insurance, existence of chronic disease, and self-rated health were included in the model. Results: Results showed that females faced CHE 1.5 times more than males (odds ratio, 1.241). Also, main determinants of CHE in female groups were marital status, while age and economic activity status were significant in male groups. Subgroup analysis displayed that married female under 35 years old are located in intersectionality of CHE including pregnancy and delivery, multiple health risk behaviors, mental stress, and relatively vulnerable social status due to lower income. Meanwhile, both gender above 50 years old faced remarkably high chance of CHE, which seems to be caused by complex health risk behaviors and chronic diseases. Conclusion: Such results implied not only that gender is an important determinant of CHE, but also other determinants of CHE differ according to gender, which suggests a necessity of gender-based CHE support and rescue policy.

• 한국콘텐츠학회논문지
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• 제22권2호
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• pp.379-389
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• 2022

본 연구는 기혼 여성이 인지하는 부부 평등성과 출산 행위에 있어 중요한 결정 요인인 추가출산 의향 간의 상관관계를 파악하고자 기혼 여성 10,352명을 대상으로 분석하였다. 조사자의 일반적 특성 분석을 위해 빈도 분석과 카이 제곱 검정 분석을 시행하였고 각 변수와 추가출산 간 관련성 분석을 위해 이분형 로지스틱 회귀분석 및 층화 분석을 통해 연구를 진행하였다. 연구결과, 부부 평등성이 가장 낮은 0점 그룹 기준 4점 그룹은 2.01배 추가출산 의향이 높았다. 또한 3점 그룹과 2점 그룹은 각각 1.46배, 1.41배 높아 부부 평등성과 추가출산 의향이 정적인 연관성을 가지는 것을 파악하였다. 그 외에 자녀 수가 많을수록, 집을 소유하고 있는 경우, 아내가 비정규직이거나 무직일 경우 기혼 여성의 추가출산 의향이 높게 나타났다. 본 연구는 기혼 여성의 부부평등성에 초점을 맞춰 추가출산 의향과의 관련성을 분석하였으며 출산율 제고를 위해 거시적 차원의 구체적이고 합리적인 정책이 요구됨을 제언한다.