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백승환,Jung Hyeun Kim 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Shape-memory polymers (SMPs) are materials that can recover its original shape from a temporarilyfixed shape via external stimuli. Due to their shape-memory effects, SMP-based materials have beeninvestigated for engineering applications in diverse areas. Among various SMP materials, shapememorypolyurethane (SMPU) has been extensively studied. Several studies have modified the morphologyof SMPU matrices by incorporating various types of polyol components. In this study, we used twostructurally distinct polyol substances, polycarbonate diol (PCD) and polyethylene glycol, to synthesizeSMPU. The structures of the SMPU matrix could be tuned by varying the PCD mol% of the total polyol content. Shape-memory and mechanical properties are related to the interactions between the soft and hardsegments of the SMPU. The permanent shape of the SMPU can be redefined by utilizing the shapereconfigurablenature of transcarbamoylation. The redefined permanent shape can also be recoveredfrom the temporarily deformed shape through shape-memory cycles.
Fe-17wt%Mn 합금의 진동감쇠능 , 내후성 및 기계적 성질에 미치는 Cu 첨가의 영향
백승환,김정철,지광구,최종술 ( S . H . Baik,J . C . Kim,K . K . Jee,C . S . Choi ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
We have reported that an Fe-17wt%Mn alloy exhibits the highest damping capacity in the Fe-Mn binary system. In the present work, the effects of copper content on the damping capacity, atmospheric corrosion and mechanical properties were studied. The damping capacities were measured at room temperature for the air cooled Fe-17wt%Mn alloy having copper content from 0.1wt% to 1.1wt%. The damping capacity of the Fe-17wt%Mn alloy was decreased with increasing copper content. However, the addition of Copper was found to improve mechanical properties and atmospheric corrosion resistance. These mechanical properties were attributed to the formation of stress-induced martensite during tensile test.
Spinal Cerebrospinal Fluid Seeding of a Clival Chordoma: A Case Report
백승환,유인규,김승민,박기석,손현진 대한영상의학회 2015 대한영상의학회지 Vol.73 No.1
Chordomas originate from remnants of the embryonic notochord and account for < 2% of all malignant bone tumors. Chordomas have a high rate of local recurrence. However, spinal cerebrospinal fluid (CSF) seeding of a chordoma is extremely rare. Here, we present a very rare case of clival chordoma with spinal seeding. Radiologists should consider spinal CSF seeding of a clival chordoma, particularly when accompanied by signs of dural perforation or caudal extension.
사용자 안전성을 고려한 상지 재활치료 로봇의 병렬 안전 제어 시스템
백승환,박성원 대한전기학회 2022 전기학회논문지 P Vol.71 No.3
This study proposes a parallel safety control system for upper-limb rehabilitation robots to ensure patient safety. The mechanical and electrical safety devices to ensure patient safety are designed and developed to operate in several stages. The mechanical safety device is configured in a way to set the limit, and the electrical safety is constructed considering electrical insulation and failure. The safety switch could directly and immediately stop the robot's motion, and it is also implemented by the software safety switch for hazardous situations. The electrical safety system, the safety switching system, and the monitoring system are designed in a multiplexed structure that operates organically at any time in case of danger at various stages to ensure reliability against failures and malfunctions