• 공업화학
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• 제9권5호
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• pp.715-718
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• 1998

본 연구에서는 수직섬유의 길이가 서로 다른 삼차원 유리직물을 보강재로 사용하고, 매트릭스 수지로 비스페놀 타입 비닐 에스테르 (bisphenol type vinyl ester)를 사용하여 hand lay-up을 이용해 복합재료 (3D composites)를 제조하였다. 삼차원 유리직물의 수직섬유의 길이가 복합재료의 기계적 물성에 미치는 영향을 three-point bending test, flatwise compression test를 통해 조사하였다. Short-beam test법 통하여 복합재료에서의 섬유와 매트릭스 수지간의 계면접착강도를 나타내는 층간 전단강도를 구하였다. 시험 결과를 통하여 수직섬유의 길이가 복합재료의 기계적 물성 및 층간 전단강도에 많은 영향을 미침을 알 수 있었다.

• 중환자간호학회지
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• 제14권1호
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• pp.14-27
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• 2021

Purpose : This study examined the effects of work environment and organizational culture on tertiary hospital nurses' turnover intention. Methods : A cross-sectional design was used, with a convenience sample of 371 hospital nurses from 16 units of three tertiary hospitals in South Korea. Data were collected through a self-report survey conducted during September and October 2016. Data were analyzed using the chi-square test, Fisher's exact test, independent t-test, and binary logistic regression analysis. Results : A total of 43.7% of the participants were identified as having turnover intention within 1 year. Factors related to turnover intention among hospital nurses were age, marital status, and total clinical career. Furthermore, a relationship-oriented organizational culture showed a negative association with turnover intention. Conclusion : These findings suggest it is important to provide appropriate motivational programs and incentives for nurses according to their clinical career to decrease turnover intention. Moreover, establishing a relationship-oriented organizational culture will also help to reduce the turnover intention of tertiary hospital nurses.

• Tribology and Lubricants
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• 제38권6호
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• pp.227-234
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• 2022

Recently, the demand for improving energy efficiency has rapidly increased because of the growing concerns over environmental issues. In this work, the tribo-test and simulation for the initial wear and lubrication performance were performed for the piston pin in the small end system of the connecting rod of a marine engine, to obtain useful data for improving the efficiency of marine engine systems. In addition, a diamond-like carbon (DLC) coating was applied to the piston pin to explore feasibility of eliminating the bush used in the system. The initial wear and lubrication characteristics between the uncoated piston pin and bush were compared with that between the DLC-coated piston pin and connecting rod in the tribo-test. The simulation for the wear and lubrication performance according to the wear progression was conducted based on the data obtained from the test. The wear characteristics were quantitatively assessed by the wear depth and wear volume, and the lubrication performance was characterized with the change of pressure and minimum oil film thickness with respect to the crank angle. It was found that the DLC-coated piston pin may provide better initial wear characteristics and lubrication performance. The results of this work may provide fundamental information for marine engines with improved efficiency.

• Corrosion Science and Technology
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• 제23권2호
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• pp.145-153
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• 2024

In the automotive industry, the hole expanding test is widely used to assess the formability of punched holes in sheets. This test provides a good representation of formability within the framework defined by the ISO 16630 standard. During hole expanding tests on galvanized high strength steels, a negative effect was observed when there was a delay between hole punching and expansion, as compared to performing both operations directly. This effect is believed to be caused by hydrogen aging, which occurs when hydrogen diffuses towards highly-work hardened edges. Therefore, the aim of this study is to demonstrate the migration of hydrogen towards work-hardened edges in high strength Zn-coated steel sheets using a novel Thermal Desorption Analyzer (TDA) designed for small samples. This newly-developed TDA setup allows for the quantification of local diffusible hydrogen near cut edges. With its induction heating and ability to analyze Zn-coated samples while reducing artifacts, this setup offers flexible heat cycles. Through this method, a hydrogen gradient is observed over short distances in shear-cut galvanized steel sheets after a certain period of time following punching.

• 한국컴퓨터정보학회논문지
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• 제22권8호
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• pp.1-7
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• 2017

In this paper, we proposed the test equipment that can perform separate performance tests to mass-produce the Automatic Test Equipment. Until now, the performance test of the ATE has been performed after it has been assembled perfectly. It is possible to perform the performance test only when the external device manufacturing and setting of measurement resources and the internal wiring work have been completed. So we have been studying test equipment that separately tested the switching devices that played a key role in the performance of the ATE. To build the test equipment, we reviewed the circuit card assemblies that make up the switching devices. We designed a test equipment that satisfies the performance test and apply the completed test equipment to the actual production process to analyze whether it was effective in improving the time and workability of the performance test. The test equipment has the advantage that it can be used universally in the mass production process of ATE with the same type of switching device.

• 가정과삶의질연구
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• 제32권5호
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• pp.1-13
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• 2014

This study examined the multicultural efficacy and job satisfaction of multicultural family visiting instructors. The subjects were 750 visiting instructors from 140 multicultural family support centers in Seoul, 6 metropolitan cities, 9 provinces, and other cities and counties. Data were analyzed through frequency, percentages, Pearson's correlations, One-way ANOVA, Scheff$\acute{e}$ post-hoc test, independent t-test, and stepwise multi-regression using PASW 18.0. The findings are as follows. First, there were statistically significant differences in all subscales of multicultural efficacy according to the teaching experiences of the multicultural family visiting instructors. On the other hand, there was a statistically significant difference only in trust in the relationships with multicultural families according to the teaching experiences of the multicultural family visiting instructors. Meanwhile, the independent t-test showed that there was a significant difference only in satisfaction regarding treatment and salary according to the assigned work. Second, the stepwise multi-regression models revealed that three subscales (job performance, trust in the relationships with the multicultural families, job aptitude) of job satisfaction were influenced by multicultural efficacy according to both the teaching experiences and assigned work, but this was no the case for satisfaction about treatment and salary. Regardles of teaching experience or assigned work, teaching efficacy in multicultural efficacy affected all subscales of job satisfaction except for satisfaction about treatment and salary. The implications for future studies are also discussed.

• 산업노동연구
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• 제19권1호
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• pp.65-104
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• 2013

본 연구는 자원기반관점을 기초로 고성과작업시스템-종업원성과-운영성과 간 관계를 실증적으로 검증하고자 하였다. 조직수준의 고성과작업시스템과 개인수준의 종업원 태도 간 실증분석을 위해 위계적 선형모형(hierarchical linear modeling)을 활용한 다수준분석을 실시하여 인과관계의 정확성을 높였다. 이를 위해, 제3차 인적자원기업패널(HCCP: Human Capital Corporate Panel) 데이터 가운데 316개 기업과 7,872명(팀장 923명 포함)의 응답자를 대상으로, 고성과작업시스템이 개인수준인 종업원성과에 미치는 영향을 확인하였다. 이후, 분석수준을 일치시키기 위해 개인수준(종업원성과)과 팀수준(운영성과)의 패널자료를 조직수준으로 집산(aggregation)하여 타당화 검증을 실시하고, 조직수준에서 매개효과를 검증하였다. 그 결과, 고성과작업시스템은 종업원성과(직무만족, 조직몰입, 신뢰)와 운영성과에 각각 유의한 영향을 미치는 것으로 나타났다. 종업원성과 개별변수의 매개효과 검증에서는 직무만족과 신뢰가 고성과작업시스템과 운영성과 간 관계를 매개하는 것으로 나타났다. 결론에는 연구의 결과, 이론적 시사점 및 한계점을 제시하고 있다.

• 디지털융복합연구
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• 제20권1호
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• pp.95-105
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• 2022

본 연구는 일·생활 균형문화 확산 및 맞벌이 부부의 증가 등으로 변화된 성별에 따른 일·생활 균형 인식수준 차이분석과 일·생활 균형이 부모 자신감에 미치는 영향을 살펴보고자 하였다. 더불어 일·생활 균형이 부모 자신감에 미치는 영향관계에서 경력관리의 조절효과를 살펴보고자 하였다. SPSS 18.0 통계패키지 프로그램을 이용하여 t-검정, 단순선형회귀분석, 위계적 회귀분석을 통해 일·생활 균형, 부모 자신감, 경력관리의 구조적 관계를 규명하였다. 실증분석에는 총505개의 데이터를 활용하였으며, 결과를 요약하면 첫째, 성별에 따른 일·생활 균형 인식수준에 차이가 없는 것으로 나타났으며, 둘째, 일·생활 균형이 부모 자신감에 정(+)의 영향을 미치는 것으로 나타났다. 마지막으로 일·생활 균형이 부모자신감에 미치는 영향관계에서 조직차원의 경력관리가 조절역할을 하는 것으로 나타났다. 이러한 연구결과를 바탕으로 기혼여성인력 활용 및 일·생활 균형지원을 위한 기업의 노력 등에 관한 실용적 시사점 등을 제안했다.

• 한국과학교육학회지
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• 제28권5호
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• pp.453-463
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• 2008

이 연구에서는 Draw-An-Environmental-Scientist-Test(DAEST)를 이용하여 학생들의 환경과학자와 환경과학자가 하는 일에 대한 인식과, 환경과학자 그림을 그리는데 영향을 미친 요인을 조사했다. 서울시 소재 일반계 고등학교 3개교에서 1학년과 2학년 학생 413명을 대상으로 DAEST를 실시했다. 연구 결과, 학생들의 환경과학자에 대한 이미지는 과학자의 정형적인 이미지와는 다르게 나타났다. 학생들의 그림에는 환경과학자의 나이와 성의 특징이 뚜렷하게 나타나지 않았다. 또한, 대부분의 학생들은 환경과학자를 야외에서 실험기구와 노트북 컴퓨터 등을 이용하여 환경오염과 관련된 데이터 수집을 하는 사람으로 인식했다. 한편, 학생들은 환경과학자에 대한 그림을 그리는데 영향을 준 요인으로 대중매체, 학교교육, 인터넷 등을 제시했다. 환경과학자와 환경과학자가 하는 일에 대한 인식 및 인식에 영향을 미친 요인은 학생들의 학년과 성에 따라 다르게 나타났다. 이에 대한 교육적 함의를 논의했다.

• Annals of Occupational and Environmental Medicine
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• 제34권
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• pp.42.1-42.11
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• 2022

Background: Occupational pesticide exposure is a potential risk for respiratory health effects. Most clinical studies on pesticide exposure were related to acute exposure, and only a few studies on chronic exposure have been conducted. This study investigated the chronic respiratory health status and the chronic effects of occupational pesticide exposures of farmers in Gyeonggi-do. Methods: Surveys and pulmonary function tests were conducted on 1,697 farmers in 16 regions of Gyeonggi-do. The structured questionnaire included demographic characteristics, medical history, recent respiratory symptoms and diseases, and work-related conditions, and was conducted through one-on-one interviews. The prevalence of respiratory diseases was compared by the odds ratios (ORs) at 95% confidence intervals (CIs) estimated by logistic regression analysis. Additional multivariate logistic regression analysis was also conducted. Results: Pesticide work groups showed significant association with an obstructive pattern in the lung function test (unadjusted OR, 2.38; 95% CI, 1.17-5.52). Selected work-related variables of pesticide exposure were 'start age,' 'cumulative duration,' 'mixing pesticides,' and 'protection(goggle).' The obstructive pattern of lung function test showed significant associations with mixing pesticides (OR, 2.30; 95% CI,1.07-5.46), and protection (goggle) use (OR, 0.34; 95% CI, 0.12-0.79). Conclusions: Mixing two or more pesticides showed a significant association. Wearing goggles can be seen as an indicator of awareness of the protective equipment and proper wearing of protective equipment, and loss of pulmonary function can be prevented when appropriate protection is worn.