Development of Sustainable High-Performance Running Shoes through Eco-Friendly Supercritical Injection Physical Foaming Technology with Adhesive-Free One-Step Shoe Manufacturing 친환경 초임계 인젝션 물리발포 공법을 활용한 무접착제 1STEP 신발제조 개발을 통한 지속가능한 고기능성 러닝화 개발