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HyRAM+, PHAST & SAFETI를 통한 제조식 수소충전소 정량적 위험성 평가
김진서(Jinseo Kim),김이수(Leesu Kim),유나린(Narin Yoo),최병주(Byoungju Choi),정승호(Seungho Jung) 한국에너지학회 2024 에너지공학 Vol.33 No.1
As Hydrogen is attracting global attention as an eco-freindly energy, Korea aims to expand hydrogen infrastructure like HRS (Hydrogen Refueling Station). However, due to the risk of hydrogen itself, it is essential to evaluate the risk of HRS. Particularly, in the case of onsite HRS, prior research on Risk Assessment is insufficient. Therefore, in this study, the suitability of the location was identified through QRA(Quantitative Risk Assessment) of the on-site HRS. The consequence of jet fire was derived from HyRAM+. Also IR(Individual Risk) and SR(Societal Risk) graphs were derived from SAFETI v8.9. In addition, in order to consider Catastrophic Rupture situation, the range of consequence was derived from PHAST v8.7. and applied to the UK Land Use Planning.
웨어러블 의료 기기용 3D 프린팅, 자가 접착 및 자가 힐링이 가능한 이온트로닉 하이드로젤 개발
김진서(Jinseo Kim),최건준(Geonjun Choi),김소미(Somi Kim),김재일(Jaeil Kim),정훈의(Hooneui Jeong) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Ionotronic hydrogels have attracted significant attention in emerging fields such as wearable devices, flexible electronics, and energy devices. To date, the design of multifunctional ionotronic hydrogels with strong interfacial adhesion, rapid self-healing, three-dimensional (3D) printing processability, and high conductivity are key requirements for future wearable devices. Herein, we report the rational design and facile synthesis of 3D printable, self-adhesive, self-healing, and conductive ionotronic hydrogels based on the synergistic dual reversible interactions of poly(vinyl alcohol), borax, pectin, and tannic acid. Multifunctional ionotronic hydrogels exhibit strong adhesion to various substrates with different roughness and chemical components, including porcine skin, glass, nitrile gloves, and plastics (normal adhesion strength of 55 ㎪ on the skin). In addition, the ionotronic hydrogels exhibit intrinsic ionic conductivity imparting strain -sensing properties with a gauge factor of 2.5 up to a wide detection range of approximately 2000%, as well as improved selfhealing behavior. Based on these multifunctional properties, we further demonstrate the use of ionotronic hydrogels in the 3D printing process for implementing complex patterns as wearable strain sensors for human motion detection. This study is expected to provide a new avenue for the design of multifunctional ionotronic hydrogels, enabling their potential applications in wearable healthcare devices.
한규서(Kyuseo Han),김홍기(Hongki Kim),강병호(Byungho Kang),윤창락(Changrak Yoon),김진서(Jinseo Kim),조맹섭(Maengsub Jo) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1A
다양한 응용분야에서 디지털 칼라영상은 프린터를 통하여 출력되어진다. 이러한 출력 장비들의 하드웨어적 특성은 칼라 영상의 색을 왜곡시켜 부정확한 색 재현을 얻게 된다. 본 논문에서는 다차 비선형 변환을 이용하여 주어진 칼라 프린터의 특성을 알아내고 이를 보정하는 방법을 제시한다. 또한, 샘플의 개수를 변화하면서 비선형 변환식을 계산하여 기기의 특성화 모델링 과정에 필요한 적정 수준의 샘플 개수를 제시한다. 실험을 통하여 원본의 색과 재현 되어진 색의 색차를 구함으로써 제안하는 방법의 타당성을 검증한다.