본 연구에서는 2008년 1월부터 2019년 10월까지 보고된 국내외 출간･비출간 연구를 대상으로 오락용 게임이 일반 사용자의 공격성, 사회성 및 정서에 미치는 영향에 대한 다변량 메타분석을 시행했다. 총 22개 관련 연구(효과 크기 수 = 54개, 참여자 수 = 8031명)에 대한 메타분석 결과에 따르면, 게임의 폭력성 또는 폭력적 게임의 이용이 사용자의 정서기능에 미치는 영향은 크지 않았다. 진실험연구 분석 결과에서만 게임의 폭력성 또는 폭력적 게임의 이용이 사용자 의 공격적 인지와 친사회적 행동에 약한 수준의 부정적 영향을 미치는 것으로 나타났다. 뿐만 아니라 공격적 행동과 부정적 감정(예를 들면 불안, 우울 등)에 미치는 영향은 진실험, 준실험 및 상관회귀 연구 모두 통계적으로 유의미하지 않았다. 조절변수에 대한 메타분석 결과, 게임의 폭력성 또는 폭력적 게임 이용의 효과는 아동보다 청장년에게서, 남녀의 비율이 균등하게 통제된 연구보다 남성의 비율이 더 높은 연구에서, 그리고 방법론적 질이 높은 연구보다 방법론적 질이 낮은 연구에서 더 크게 나타났다. 본 연구의 결과는 게임의 폭력성 또는 폭력적 게임 이용이 사용자의 공격성에 미치는 영향은 크지 않으며, 이 또한 사용자의 연령과 성별 그리고 연구의 방법론적 질에 따라 좌우될 수 있음을 시사한다.

Perfluorinated sulfonic acid (PFSA) ionomers have been commonly used as representative polymer electrolyte membrane (PEM) materials for fuel cell electric vehicles owing to their fast proton transport and excellent chemical resistance. However, PFSA materials still have weakness associated with chemical degradation occurring as a result from radical attacks, which induce membrane thickness reduction, leading to hydrogen crossover, and/or reduced electrochemical performances. In this study, cerium derivative radical scavengers were designed as functional additives to enhance the chemical durability of PFSA PEM. Their optimum content was suggested, comprehensively considering their radical resistance as well as other fundamental characteristics associated with long-term durability and electrochemical performance.

Perfluorinated sulfonic acid (PFSA) ionomers have been used as polymer electrolyte membrane (PEM) materials owing to their excellent chemical durability and proton conductivity. However, the PFSA ionomers are suffering from fast hydrogen crossover and, thereby, chemical degradation in the membrane state. To solve these issues is to make reinforced membranes by filling proton-conductive PFSA ionomers in the pores of chemically robust poly(tetrafluoroethylene) (PTFE) support films. However, it is very difficult to obtain PFSA-PTFE reinforced membranes with improved hydrogen barrier property. In this study, PFSA-PTFE reinforced membranes were fabricated by immersing commercial reinforced membrane in PFSA ionomer dispersions with different chemical architectures and particle sizes and their effects were systematically investigated.

Sulfonated poly(arylene ether sulfone) (SPAES) random copolymers have been perceived as alternatives to perfluorinated sulfonic acid (PFSA) ionomers owing to their cheap production cost and low hydrogen permeability. In spite of their advantages, there are some issues to overcome such as membrane durability and relatively low proton conductivity in the low humidity range. An approach to solve these problems is to fill SPAES copolymers into porous support films (e.g., poly(tetra fluoro ethylene), PTFE). However, it is difficult to make defect-free pore-filling membranes. In this study, SPAES nanodispersion in a water-alcohol mixture is made under a modified supercritical condition and used to make highly proton conductive and chemical durable SPAES-PTFE pore-filling membranes.

Lithium ion battery are one of representative rechargeable batteries with high energy density, tiny memory effect, and low self-discharge and composed of anode, cathode, electrolyte, and membrane separator. The importance of membrane separator has been improved further as electric vehicle market increases rapidly. The conventional membrane separators are based on polyolefin (e.g., polyethylene and/or polypropylene). In case of lithium ion battery with a high capacity, polyolefin membrane separators are suffering from low thermal resistance and easy short-circuit formation leading to overheating. For these reasons, in this study, gel polymers are in-situ synthesized in electrolytes used as solvent, which are located in pores of polyolefin separators to obtain gel polymer electrolyte-polyolefin reinforced membranes.

Sulfonated poly(arylene ether sulfone) (SPAES)random copolymers have been perceived as alternatives to perfluorinated sulfonic acid (PFSA) ionomers owing to their cheap production cost and low hydrogen permeability. In spite of their advantages, there are some issues to overcome such as membrane durability and relatively low proton conductivity in the low humidity range. An approach to solve these problems is to fill SPAES copolymers into porous support films (e.g., poly(tetra fluoro ethylene), PTFE). However, it is difficult to make defect-free pore-filling membranes. In this study, SPAES nanodispersion in a water-alcohol mixture is made under a modified supercritical condition and used to make highly proton conductive and chemical durable SPAES-PTFE pore-filling membranes.