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대전방지 열가소성폴리우레탄 M/B를 이용한 코팅사 제조 조건이 대전방지성에 미치는 영향
정예담,권지은,권선민,채시현,조현제,김우석,김미경,김종원 한국염색가공학회 2023 韓國染色加工學會誌 Vol.35 No.1
In this study, TPU resin for coating was prepared by varying the mixing ratio of antistatic TPU and recycled TPU to manufacture permanent antistatic materials. The coated yarn was prepared by coating on the nylon yarn, and then the thermal, rheological, mechanical properties and antistatic properties were analyzed. In addition, antistatic properties and durability were confirmed after manufacturing UD fabrics using coated yarns. The mixing ratio of antistatic TPU and recycled TPU was most appropriate at 4:6, and the antistatic property had a surface resistance of 2.20 × 109 Ω and a static charge of 398 V. In the coating process, the coating speed was most appropriate at 0.21 m/s, and the surface resistance of the UD fabric manufactured with the coated yarn manufactured under this condition was 6.80 × 109 Ω and the static charge was 484 V. The UD fabric had a surface resistance of 7.21 × 109 Ω and a static charge of 517 V after washing 10 times, and it was confirmed that the permanent antistatic property was excellent.
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초기 성인의 자기개념 명확성, 자기침묵, 정서표현 양가성, 외로움 간의 구조적 관계
정예담(Ye Dam Jeong),장진이(Jin Yi Jang) 한국발달지원학회 2024 발달지원연구 Vol.13 No.2
이 연구는 초기 성인기에 해당되는 남녀 성인의 자기개념 명확성, 자기침묵과 정서표현 양가성, 외로움 간의 구조적 관계를 검증하고자 하였다. 이를 위해 자기개념 명확성, 자기침묵, 정서표현 양가성, 외로움에 대한 설문을 진행하였으며, 초기 성인 308명의 자료를 SPSS 22.0과 AMOS 22.0을 사용하여 분석하였다. 분석 결과 첫째, 각 변인 간의 상관관계가 모두 유의미하였다. 둘째, 자기개념 명확성은 외로움에 직접적인 영향을 미치는 것으로 나타났다. 셋째, 자기개념 명확성이 외로움에 미치는 영향에서 자기침묵의 매개효과는 유의미하지 않았다. 넷째, 자기개념 명확성이 외로움에 미치는 영향에서 정서표현 양가성의 매개효과가 유의미하였다. 다섯째, 자기개념 명확성이 외로움에 미치는 영향에서 자기침묵과 정서표현 양가성의 이중매개 효과가 유의미하였다. 이러한 연구 결과를 바탕으로 외로움을 호소하는 초기 성인에 대한 심리사회적 지원에서 자기(self)와 관련된 심리적 역량을 탐색하고 개입할 필요성을 강조하고, 추후 연구에 대한 함의를 논의하였다. The purpose of this study was to analyze the structural relationship among self-concept clarity, silencing the self, ambivalence over emotional expressiveness and loneliness on young adults. To achieve this, an online survey was conducted and analyzed 308 young adults data. Results of the study were as follows: First, self-concept clarity had significantly negative impacts on loneliness, silencing the self and ambivalence over emotional expressiveness respectively. Second, self-concept clarity was found to have a direct effect on loneliness. Third, the mediating effect of silencing the self was not significant in the effect of self-concept clarity on loneliness. Fourth, the mediating effect of ambivalence over emotional expressiveness was significant in the effect of self-concept clarity on loneliness. Fifth, the double mediating effect of silencing the self and ambivalence over emotional expressiveness was significant in the effect of self-concept clarity on loneliness. Based on these research results, the need to explore the strategies of intervention for psychological competencies related to the self in psychosocial support for early adults who complain of loneliness was emphasized, and implications for future research were discussed.
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단열성 재료 함량에 따른 PET 원사의 기계적 물성 및 직물의 단열성에 관한 연구
김태윤,권선민,채시현,정예담,조현제,최익성,김종원 한국염색가공학회 2023 韓國染色加工學會誌 Vol.35 No.2
Recently, the automobile industry is developing as the demand for automobiles increases due to industrial development and population growth. In addition, many studies are being conducted to reduce heat loss inside the automobiles in order to save energy inside the automobiles due to environmental regulations. In this study, alumina, nanosilicon, and aerogel, which are adiabatic materials, were filled in PET to manufacture yarn, identify physical and mechanical properties, and weave into fabric to confirm adiabatic performance. As the content of the adiabatic material increased, the tensile strength of the fibers filled with alumina and nanosilicon decreased greatly, and the adiabatic property slightly increased. The tensile strength of fibers filled with the aerogel decreased slightly, but the adiabatic properties were greatly increased. Therefore, it is considered to be due to the large volume fraction in the PET yarn due to the low density of the aerogel.
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유리섬유 코팅사와 탄소섬유를 이용한 일방향 탄소섬유시트 제조 공정이 콘크리트 보강에 미치는 영향
권지은,권선민,채시현,정예담,김종원 한국염색가공학회 2022 韓國染色加工學會誌 Vol.34 No.3
In this study, carbon fiber and coated glass fiber are applied to warp and weft fiber in order to reduce the amount of carbon fiber used in carbon fiber fabrics, which are often used for reinforcement of building structures. A low-cost thermoplastic resin was coated on glass fibers to prepare a shape-stabilizing glass fiber. A unidirectional carbon fiber sheet was manufactured using the prepared coated glass fiber and carbon fiber. In order to identify whether it can be used for reinforcing architectural and civil structures, it was attached to a concrete specimen and its mechanical properties were analyzed. The optimum manufacturing conditions for the coated glass fiber were 0.3 mm in diameter of the coating nozzle, the coating temperature was 190 ℃, and the coating speed was 0.3 m/s. 14 mm was optimal for the weft spacing of the coated glass fiber. The flexural strength of the concrete reinforced with the manufactured unidirectional carbon fiber sheet was slightly lower than that of the concrete reinforced with carbon fiber fabric, but it was confirmed that the reinforcement effect was better when the amount of carbon fiber was considered.
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