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Liquid Crystallinity of p-Aramid/Multi-walled Carbon Nanotube Composites
김채빈,최용문,김현주,이해나,유남호,이재관,구본철,고문주 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
A systematic study regarding the liquid crystallinity of p-Aramid and MWCNTs composite at various p-Aramid and MWCNTs concentrations in sulphuric acid was investigated and optimized by solution viscosity measurement and opalescence observation. We observed a merged liquid crystalline phase consisting of both p-Aramid and MWCNTs, and we believe this is the first study to report this combined liquid crystalline phase in one suspension. In addition to providing fundamental insights, we envision this study could be useful to those developing a strong, light, and high-performance polymeric composite fibers.
관계상실 경험 대학(원)생의 감사 성향이 역경 후 성장에 미치는 영향: 삶의 의미와 의도적 반추의 매개효과
김채빈,박기환 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.1
Objectives The purpose of this study was to examine the role of meaning in life and deliberate rumination in the relationship between gratitude disposition and posttraumatic growth. Methods 351 (under)graduate students who experienced relational loss completed the self-report questionnaires for Relational loss, Gratitude disposition, Meaning in Life, deliberate Rumination and Posttraumatic Growth. The data was analyzed using SPSS Statistics 26.0 and PROCESS MACRO v4.0. Results First, gratitude disposition, meaning in life, deliberate rumination, and posttraumatic growth were all significantly correlated in a positive direction. Second, meaning in life and deliberate rumination had a simple mediating effect on the relationship between gratitude disposition and posttraumatic growth. Third, meaning in life and deliberate rumination had a sequential dual mediating effect on the relationship between gratitude disposition and posttraumatic growth. Conclusions These finding suggested that higher gratitude disposition increased the level of meaning in life, and that leads to an increase deliberate rumination, promoting posttraumatic growth. Based on these results, clinical implications and limitations of this study were discussed. 목적 본 연구의 목적은 관계상실을 경험한 대학(원)생을 대상으로 감사 성향이 역경 후 성장에 미치는 영향을 탐색하고, 이 관계를삶의 의미와 의도적 반추가 부분 매개하는지 검증하는 것이다. 방법 이를 위하여 관계 상실을 경험한 대학(원)생(N=351)을 대상으로 상실 경험 관련 질문지, 한국판 감사 성향 척도(K-GQ-6), 삶의 의미 척도(MLQ), 한국판 사건관련 반추 척도(K-ERRI), 한국판 외상 후 성장 척도(K-PTGI)로 구성된 자기보고식 설문을 실시하였다. 수집된 자료는 SPSS 26.0과 PROCESS MACRO v4.0을 활용해 분석하였다. 결과 감사 성향, 삶의 의미, 의도적 반추, 역경 후 성장은 모두 유의한 정적 상관을 보였으며, 감사 성향과 역경 후 성장의 관계에서삶의 의미와 의도적 반추 각각의 단순 매개효과가 확인되었다. 또한, 감사 성향과 역경 후 성장의 관계에서 삶의 의미와 의도적 반추의 순차적 이중 매개효과가 확인되었다. 다만, 순차적 이중 매개모형에서 감사 성향이 의도적 반추에 미치는 영향 및 의도적 반추의매개효과가 유의하지 않은 것으로 나타났다. 결론 이러한 결과는 관계상실 경험자의 감사 성향이 높을수록 삶의 의미 수준이 높아지며, 이를 통해 의도적 반추가 활성화되어 역경후 성장을 촉진할 수 있음을 의미한다. 다만, 높은 감사 성향을 가졌다고 해서 의도적 반추가 곧바로 촉진되는 것은 아니며, 삶의 의미를 발견하고 추구하는 과정을 거친 후에 의도적 반추가 증가한다고 해석할 수 있다. 즉, 감사 성향을 통해 증진된 삶의 의미를 통해서만 의도적 반추가 촉진된다는 점에서 삶의 의미가 중요한 매개변인임을 예측할 수 있다. 이러한 연구 결과를 바탕으로 본 연구가 가지는 의의와 제한점 및 후속 연구를 위한 제언에 대해 논의하였다.
김지빈,김채빈,샹잉잉,Jung-Jun Park,강현주,송욱,이한준,이충근,안연순,서동일 대한운동학회 2023 아시아 운동학 학술지 Vol.25 No.3
OBJECTIVES Firefighters play a critical role in high-temperature environments that demand substantial physical strength for efficient job performance. However, South Korean firefighters face challenges in maintaining optimal fitness levels due to limited opportunities for exercise. Factors that contribute to this issue include shift work, frequent dispatches, and the absence of exercise instructors. Met hods At total of 20 male Korean firefighters were divided into an exercise group (EG) and a control group (CG) with ten participants each. The EG group underwent an 8-week exercise intervention at a fire academy in Busan using a kinect-based exercise device called Virtual Mate (VM), while the CG group maintained their regular lifestyle without any additional exercise. Pre- and post-assessments were conducted, including the Candidate Physical Ability Test (CPAT), a physical fitness evaluation commonly used for firefighting duties in North America, the Korea Firefighter Performance Battery (KFPB), which is a modified version of CPAT, and basic physical fitness tests. The effect of exercise was analyzed using statistical methods, including repeated measures analysis of variance and paired t-tests. Results Significant group-by-time interactions were observed for CPAT completion time (p = .004) and KFPB completion time (p = .012). After 8 weeks of exercise, the EG demonstrated a significant decrease in CPAT completion time (543.7 ± 93.0 sec vs. 500.8 ± 64.1 sec, p = .004) and KFPB completion time (584.1 ± 47.8 sec vs. 525.3 ± 16.2 sec, p = .001), while the CG did not show significant changes. In terms of basic physical fitness, only in EG, number of sit-ups performed in one minute significantly increased (p < .001) Conclusions The Kinect-based exercise device, VM, proves to be a valuable solution for addressing the practical challenges faced by Korean firefighters, ultimately enhancing their physical fitness.