비정질 할로이사이트 나노입자의 교차적층 구조에 따른 탄소섬유/에폭시 라미네이트의 저속 충격 특성

박예림 ( Ye-rim Park ),( Sanjay Kumar ),김윤해 ( Yun-hae Kim ) 한국복합재료학회 2023 Composites research Vol.36 No.4

필라멘트 와인딩 공정을 사용한 FRP 복합재의 적층 구조는 기존의 FRP 복합재의 적층 구조와는 다를 뿐만 아니라 일반적인 적층 구조를 토대로 기계적 물성에 대해서 분석하고자 한다면 그에 대한 영향을 파악하는 것이 어렵다. 따라서 전반적인 성능을 향상시키기 위해 기계적 물성을 개선하고 교차 적층 구조를 최적화하는 것이 필수적이다. 따라서 본 연구는 비정질 할로이사이트 나노튜브(Amorphous Halloysite Nanotubes, A-HNT)를 5개의 층 배열을 통해 교차 적층 탄소 섬유 강화 플라스틱(CFRP) 구조의 저속 충격 특성에 미치는 영향을 조사하는 것을 목표로 한다. 중량 낙하식 충격시험을 통하여 라미네이트의 저속 충격 특성을 확인하였으며, 충격을 가한 후에 현미경을 통하여 충격 파손 모드와 손상 정도를 비교 평가하였다. 나노 입자의 첨가 여부에 따른 각각의 교차 적층 구조 라미네이트를 10 J과 15 J의 충격에너지에서 비교하였다. 10 J의 경우 흡수에너지는 각 구조에서 비슷한 경향을 보였다. 그에 비해 15 J의 경우 흡수에너지는 각 구조에서 다른 흡수에너지를 가지며, 나노 입자가 첨가되지 않은 구조가 가장 높은 흡수에너지를 가진다. 또한 광학현미경을 통하여 각 구조에서 다양한 충격 파손 모드가 관찰되었다. The stacking configuration of fiber-reinforced polymer (FRP) composites, achieved via the filament winding process, exhibits distinct variations compared to conventional FRP composite stacking arrangements. Consequently, it becomes challenging to ascertain the influence of mechanical properties based on the typical stacking structures. Thus, it becomes imperative to enhance the mechanical behavior and optimize the interleaved structures to improve overall performance. Therefore, this study aims to investigate the impact of incorporating amorphous halloysite nanotubes (A-HNTs) within different layers of five unique layer arrangements on the low-velocity impact properties of interleaved carbon fiber-reinforced polymer (CFRP) structures. The low-velocity impact characteristics of the laminate were validated using a drop weight impact test, wherein the resulting impact damage modes and extent of damage were compared and evaluated under microscopic analysis. Each interleaved structure laminate according to whether nanoparticles are added was compared at impact energies of 10 J and 15 J. In the case of 10 J, the absorption energy showed a similar tendency in each structure. However, at 15 J, the absorption energy varies from structure to structure. Among them, a structure in which nanoparticles are not added exhibits the highest absorption energy. Additionally, various impact fracture modes were observed in each structure through optical microscopy.

타입 4 복합재 압력용기 라이너의 회전 성형 온도에 따른 저온 특성

정홍로,박예림,양동훈,박수정,김윤해,Jung, Hong-Ro,Park, Ye-Rim,Yang, Dong-Hoon,Park, Soo-Jeong,Kim, Yun-Hae 한국복합재료학회 2022 Composites research Vol.35 No.3

Low-temperature characteristics according to internal temperature conditions during rotational molding of Type 4 pressure vessel liners were studied in this paper. Since rotational molding has a sensitive effect on the formability of the liner depending on the temperature conditions, the temperature conditions for the polyamide used should be accurately set. The structural changes of polyamide as the liner material was analyzed the surface by atomic force microscope (AFM), and the crystallinity measured with a differential scanning calorimeter (DSC) is used to evaluate the change of the mechanical strength value at low temperature. In addition, the formability of the liner was confirmed by observation of the yellow index inside the liner. As a result, as the melting range of the internal temperature becomes wider, the yellow index shows a lower value, and the elongation and impact characteristics at low temperatures are improved. It was also confirmed that the structure of the polyamide was uniform and the crystallinity was high by AFM and DSC. These experimental results contribute to the improvement of characteristics at low temperatures due to changes in temperature conditions during rotational molding.

어린이집 연장보육 전담교사로 살아가는 교사들의 이야기

이선미 ( Lee Sun-mi ),박예림 ( Park Ye-rim ) 미래유아교육학회 2022 미래유아교육학회지 Vol.29 No.4

본 연구는 연장보육 전담교사의 연장보육반 운영을 위한 노력과 어려움, 연장보육 전담교사로 살아가는 과정에서 느끼는 보람 등 연장보육반을 운영해나가며 겪는 경험과 인식을 있는 그대로 살펴 경험의 의미를 밝히고자 하였다. 서울 지역 어린이집에서 6개월 이상 재직하고 있는 연장보육반 전담교사들을 대상으로 눈덩이 표집 방식을 통해 연구참여자 5인을 선정하여 내러티브 연구 방법을 통해 탐구하고자 하였다. 자료수집은 2022년 7월부터 9월까지 2개월 간, 면담이 이루어졌으며 현장텍스트와 면담 녹취록을 반복하여 읽고 들으며 연구텍스트를 구성하였다. 연구결과, 첫째, 연장보육 전담교사들은 연장보육반 운영에 있어 자신을 교육적 전문가로 인식하며, 명확한 보육철학을 가지고 영유아의 놀이와 휴식을 지원하고 있었다. 둘째, 연장보육 전담교사들은 연장보육반에 대한 운영의 책임과 노력에도 불구하고 연장보육반 운영에 있어 열악한 지원과 보육 외에 맡는 다양한 잡무를 담당하게 되는 등 교육적 전문가로 인정받지 못하는 어려움을 경험하고 있었다. 셋째, 연장보육 전담교사들은 이러한 어려움에도 불구하고 영유아와 깊어지는 애착, 연장보육 전담교사에 대한 학부모의 믿음과 신뢰를 통해 보람을 느끼고 있었다. 또한, 연장보육의 중요성과 필요를 절감하며 교육적 전문가로 성장해나가는 자신의 모습을 바라보며 연장전담 보육교사로 살아가는 것에 대한 만족과 행복을 경험하고 있었다. 본 연구결과를 통해 보육현장에서 연장전담 보육교사의 연장보육반 원활한 운영과 내실화를 위한 시사점이 논의되었다. The purpose of this study was to explore the difficulties, effort, and work satisfaction of extended child care teachers. This study used narrative inquiry and snowball sampling method to collect participants and analyze the data. Five extended child care teachers who is working at day care center in Seoul Korea were participated. Data analysis was proceeded from July to September 2022 by reading narrative interview transcripts and field notes of participants repeatedly. The research results were as follows. First, the participants perceived themselves as an educational professionals with childcentered philosophy. They were able to engage and support play activities and recess time through out the extended classroom activities with young children. Second, the participants were not recognized as an educational professional from the working environment. Instead they received additional chores and a poor support to manage the extended care children by regular child care classroom teachers. The participants felt that their efforts and strong responsibilities toward children and the extended classroom management was ignored. Third, despite these difficulties, the extended child care teachers recognized themselves as rewarded by having strong bond and trust with young children and parents. Moreover, the extended child care teachers showed positive work satisfaction and happiness by perceiving themselves as educational professionals and realizing the importance and necessity of extended childcare. In conclusion, the study would provide a further direction and guideline to promote high quality of managing extended child care classroom and professionalism of extended child care teachers.

대학생 나홀로족의 소비행태에 대한 연구

최기열(Choi, Ki-yeol),박예림(Park, Ye Rim),손민균(Son, Min Kyun),유미리(You, Mi Ry),유현정(Yoo, Hyun Jung) 충북대학교 생활과학연구소 2018 생활과학연구논총 Vol.22 No.1

This paper presents an investigation into the consumption behavior of aloners among college students according to the consumption trends of aloners recently on the rise. A survey was conducted with total 320 college students at universities in Cheongju for approximately three weeks from June 20 to July 12, 2016. The major findings were as follows: First, the study examined the overall consumption life of college students and found that they were more accustomed to consumption with their friends than consumption by themselves. The analysis results of their individualism/collectivism tendencies, however, showed that they preferred the individualism tendency, which indicates that their perceptions of being alone were less negative than before and changed to be daily and universal. Secondly, 42.8% of the entire college students belonged to aloners. Of them, 86.6% were voluntary aloner members, overwhelming their non-voluntary counterparts(13.4%). The reasons why they became aloners were divided into emotion and condition categories. Many of them became aloners voluntarily to avoid emotional losses. Thirdly, the study examined differences in consumption satisfaction between consumption by oneself and consumption with others and found that aloners had no big differences in satisfaction with consumption between them, whereas the non-myself aloners recorded considerably higher points in consumption behavior with others than consumption behavior by themselves. Finally, the study analyzed the effects of mental states regarding consumption by oneself on satisfaction and found that negative psychology had negative effects on satisfaction with consumption by oneself.

아동양육시설종사자의 조직문화 지각이 직무만족도에 미치는 영향

홍원표 ( Hong Wonpyo ),이선미 ( Lee Sun-mi ),박예림 ( Park Ye-rim ) 미래유아교육학회 2022 미래유아교육학회지 Vol.29 No.1

본 연구는 아동양육시설 종사자가 지각한 조직문화가 직무만족도에 미치는 영향을 통해 아동양육시설에 바람직한 조직문화를 찾고 직무만족도를 높이는 방안을 모색하고자 한다. 이를 위해 전국 아동양육시설 종사자 318명을 대상으로 설문지를 통해 자료를 수집하고 SPSS 24.0을 사용하여 상관분석 및 다중회귀분석을 실시하였다. 연구결과는 다음과 같다. 첫째, 아동양육시설의 종사자가 지각한 조직문화와 직무만족도의 상관관계는 전체 조직문화와 전체 직무만족도, 집단문화와 개발문화가 각각 정적인 상관관계를 보였다. 합리문화는 보수, 승진에 대한 직무만족도에 정적인 상관관계를 보였으나 위계문화는 유의미한 상관을 보이지 않았다. 둘째, 조직문화와 직무만족도의 하위요인 간 다중회귀분석을 통한 영향력을 살펴본 결과, 보수를 제외한 집단문화와 개발문화가 직무만족도에 긍정적인 영향을 미쳤다. 합리문화는 보수, 승진에 대한 만족도에 긍정적인 영향을 미쳤으나, 위계문화는 리더십, 승진, 기관에 대한 만족도에 부정적인 영향을 미쳤다. 본 연구 결과를 통해 아동양육시설의 종사자가 지각하는 조직문화를 이해할 수 있었으며, 직무만족도와의 영향을 분석함으로써 앞으로 아동양육시설 조직문화의 방향이 집단, 개발문화로 나아가야 함을 제시하였다는 것에 의미가 있다. The purpose of this study was to analyze the effect of organizational culture on job satisfaction perceived by child care workers in child residential facilities. The participants of this study were 318 child care workers in the nationwide child residential facility. The survey questionnaires were given to the participants to collect the data, and statistical analysis was performed using the SPSS 24.0 program. The results of the study were as follows. First, the correlation between late organizational culture and job satisfaction among child care workers showed the static correlation between overall organizational culture and job satisfaction, group culture and development culture. Moreover, rational culture showed a static correlation between job satisfaction and promotion, however hierarchical culture showed no significant correlation. Second, group culture and development culture, excluding compensation, had a positive effect on job satisfaction. In addition, rational culture had a positive effect on the satisfaction of remuneration and promotion, however hierarchical culture had a negative effect on leadership, promotion and agency satisfaction. In conclusion, the study suggest that the organizational culture of children's nurturing facilities should be oriented toward collective development culture.