본 연구에서는 ultra performance liquid chromatography(UPLC)를 이용하여 진해만의 식물플랑크톤 생체량 및 군집구조의 시공간적 분포에 미치는 환경요인의 영향을 조사하였다. 이를 위해 2019년 4월에서 12월까지 총 5회에 걸쳐 7개 정점에 대한 식물플랑크톤 색소분석과 수온, 염분, 용존산소(DO), 영양염(DIN, DIP, Si(OH)4) 등의 환경요인 분석을 행하였다. 조사기간 중 식물플랑크톤의 생체량(Chl-a)은 7월 (평균 15.4±4.3 μg/L)에 가장 높았고, 12월(평균 3.5±0.6 μg/L)에 가장 낮았다. 보조색소의 경우 fucoxanthin이 가장 많이 검출되었고 그 다음으 로 peridinin, Chl-b 순으로 나타났으며, 이들의 월 변동은 Chl-a와 유사한 경향을 보였다. 식물플랑크톤 군집분석결과, 규조류가 평균 70 %로 가장 우점하였으나, 일부 녹조류, 은편모조류, 와편모조류가 출현하기도 하였다. 우점종인 규조류는 특히 수온 및 N:P ratio와 밀접하게 연관되어 있어서 여름철 고온환경 및 육상으로부터의 영양염 유입에 민감하게 반응하는 것으로 추론되었다. 또한 식물플랑크톤 색소 및 종조성은 전반적으로 계절에 따른 물리화학적 환경요인의 변화 및 지형적 특성과 연관되어 있으며 강우로 인한 담수 및 영양염 공급에 큰 영향을 받는 것으로 추정되었다.

Additive manufacturing technology, 3D printing, has been applied to various industrial fields. This production method is a production method with less material, cost and time savings, and less restrictions in shape, and is also making a leap forward in the field of eco-friendly product production. In particular, FDM (fused depositon modeling) method of extrusion lamination manufacturing is widely applied in products and medical fields. And as an alternative to mold manufacturing, it is widely used in manufacturing plastic products and parts. Therefore, this paper quantitatively and qualitatively analyzes the mechanical properties according to the processing factors of the specimen through the processing of the ABS tensile specimen printed by the FDM type 3D printer and derives the optimum value.

The purpose of this study was to investigate the sustainable practices of nutrition science teachers and dietitians working in school food service operations, and identify the social and psychological factors which affect the overall efficacy of the system. The research model was constructed based on the Extended Theory of Planned Behavior (ETPB) in order to analyze how individual motivation affects the sustainable practices of nutrition science teachers and dietitians. The data were collected through e-mail and postal mail from nutrition science teachers and dietitians all across Korea, and self-administered surveys were conducted. SPSS and AMOS programs were used for statistical analysis. First, the sustainable practices of nutrition science teachers and dietitians were analyzed in 6 different categories. Second, the significant pathways were 6 out of 9 in the ETPB model. Sustainable food service practices in school can contribute to the formation of more a sustainable culture, such as through the encouragement of more healthy eating habits, and higher level of environmental awareness and community awareness. The factors influencing these practices can be applied to the design of improvement programs aimed at increasing sustainable practices.

최근 부산시는 선박관리산업의 관심을 증대시키고, 경쟁력을 강화 및 지원하기 위한 조례를 제정하였다. 본 연구는 직관적퍼지 DEMATEL&ISM법을 이용하여 선박관리산업 경쟁력 강화의 원인요인을 도출하는데 있다. 이를 위해 먼저 선박관리산업발전법에 명시된 내용을 기반으로 8개의 요인을 추출한다. 두번째는 직관적 퍼지수를 표준퍼지수를 이용하여 크리습 수로 변환한다. 세번째는 DEMATEL 법을 이용하여 영향관계를 분석하고 ISM법을 이용하여 요인에 대해 우선순위를 결정한다. 영향관계 분석결과 원인요인은 기술적 선박관리 역량 제고, 육상관리인력 전문성 제고, 한국선원인력 자질향상으로 나타났다. ISM법에 의한 우선순위는 한국선원 자질향상, 육상관리 인력 전문성 제고, 기술적 선박관리 역량제고, 상업적 선박관리 역량 제고, 종합정보시스템구축 = 선원 근로조건 및 고용환경 개선 = 금융 등 지원 = 외국인 선원 공급 강화 등의 순으로 나타났다. 따라서 전체 영역에서 원인요인이며 우선순위가 높은 상위 3개의 요인에 대해 우선적인 정책추진이 필요하다.

PURPOSES : In this study, the factors influencing traffic accidents of commercial vehicles in the transportation industry were examined. The evidence observed in this study showed how it contributes to the establishment of safety management policies. METHODS : Safety management data obtained from the Korean Transportation Safety Authority were integrated. A multi-regression analysis was performed by comparing data for the past three years of traffic accident data. RESULTS : Through multi-regression analysis, items that significantly influenced the safety evaluation index (the number of traffic accidents per vehicle owned and the number of dangerous driving actions per 100 km per person) were analyzed. Items with similar patterns observed for various commercial vehicle industries were also analyzed. Monthly average drop off rate, number of law violations per driver, percentage of drivers above 65 years old, percentage of drivers that have completed the compulsory education, number of vehicles owned, and driving distance per vehicle are the variables that influenced the safety evaluation index. CONCLUSIONS : There is a growing need to establish safety management policies and management measures to enhance the voluntary safety management capabilities of the industry. Safety management should be conducted through the analysis of traffic accident impact factors for commercial vehicles.

PURPOSES : The purpose of this study is to establish design criteria for right-turning lanes by analyzing the relationship between the speed and geometry of right-turning lanes in urban areas. METHODS : A right-turn vehicle with a traffic island was surveyed for 32 geometries and 4,012 vehicles. Using multiple regression, we developed a running speed prediction model based on the running speed characteristics and geometry scale. RESULTS : According to the analysis of the running speed of the right-turning channel, the 85th speed was 34.5-38.3 km/h, depending on the right-turning lane radius, and 32.4-39.0 km/h, depending on the channel width group. Based on the multi-regression, the right-turning radius and the channel width variables were statistically significant because of the influencing factors of the road speed. Two independent variables were positive (+) coefficients. CONCLUSIONS : In this study, we investigated the running speed state on the right-turning channel and the factors that influenced the running speed. In addition, the relationship between the running speed and other factors was modeled through statistical analysis, and a running speed prediction model was established. It was observed that the driving speed increased as the geometry scale increased. Based on the derived running speed model, the maximum design criteria for limiting the speed of the conductive channelized right-turning lane in urban areas were established.

This study attempted to investigate the factors affecting the organizational citizenship behavior (OCB) of English teachers in Turkish state high schools within the framework of job satisfaction, emotional commitment, and demographic factors. The data, which were collected through a questionnaire given to 269 English teachers, were analyzed through descriptive statistics and hierarchical regression. The findings indicated that the English teachers’ job satisfaction, emotional commitment, and OCB levels were above average. Moreover, job satisfaction and emotional commitment predicted OCB. No significant relationship was observed between demographic factors and OCB. The results showed a positive correlation between demographic factors and job satisfaction, and between demographic factors and emotional commitment. The findings suggest that OCB can play a pivotal role to increase the performance of English teachers, consequently leading to better language education. The study suggests that the non-methodological factors in English language teachers’ behaviors and performance need to be studied to increase their performance.

This case study investigated parental language ideologies and the underlying social and familial factors affecting the construction of attitudes toward bilingual parenting and how the parents’ ideologies affected the formation of family language policy and home language practices. Numerous familial factors were examined, such as parents’ socioeconomic status, educational attainment, and relationships with their children, as well as social context factors. The results of the study suggested the interconnectedness of the parents’ beliefs with the status of the English language in Korean society and the role of family capital in supporting English language use at home. Several factors affecting bilingual parenting were also investigated, such as parents’ language proficiency, available learning resources, and parents’ consistency in parenting, and use of English as the medium of communication at home. The results may resonate with the experiences of many Korean parents who have been practicing home bilingual education or are planning to do so in the near future.

본 연구는 고등학생의 자아존중감, 분노표현, SNS중독경향성의 정도 및 그들 변수 간의 관계와 SNS중독경향성에 미치는 영향 요인을 알아보고자 하는 서술적 조사연구이다. 대상자는 2020년 5월 18일~28일까지 총 10일 간 S시, G도 고등학교에 재학 중이며 SNS을 이용하고 있는 대상자에게 온라인 설문지를 이용하여 총 100부의 자료를 수집하였다. 연구결과, SNS중독경향성과 자아존중감(r=-.385, p<.001), 분노조절(r=-.354, p<.001)과는 보통의 역 상관관계, 분노표출(r=.321, p=.001), 분노억압(r=.308, p=.002)과는 보통의 순 상관관계를 나타냈다. SNS중독경향성에 미치는 영향 요인은 자아존중감(β =-.297, p=.001), 성별(β=.266, p=.003), 분노표출(β=.247, p=.007) 순으로 회귀모형의 설명력은 27.7% 로 나타났다(F=12.279, p<.001). 따라서 SNS중독경향성을 낮추기 위해 고등학생의 자아존중감을 높이고 분노표출을 낮추기 위한 프로그램 개발이 필요하며 특히 성별에서 여자 고등학생의 SNS중독경향성을 낮추기 위한 방안이 모색되어야 할 것이다.

본 연구는 후기 중년 여성의 자아존중감, 폐경 증상, 배우자지지, 노화불안의 정도를 파악하고 노화불안에 미치는 영향 요인을 알아보고자 하는 서술적 조사연구로 2020년 5월 23일부터 6월 13일까지 3주 동안 대한민국에 거주하는 기혼자 중 후기 중년 여성을 대상으로 온라인 설문지를 이용하여 총 110명의 자료를 수집하였다. 자료 분석 결과, 후기 중년 여성의 노화불안에 미치는 영향 요인은 폐경 증상(β =.515, p<.001), 자아존중감(β=-.268, p=.001) 순으로 회귀모형의 설명력은 41.4%로 나타났다. 따라서 노화불안을 낮추기 위해서는 후기 중년 여성의 폐경 증상에 대한 적극적인 중재가 필요하며 자아존중감을 높이기 위한 방안이 마련되어야 할 것이다.