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Origami multi-layer space shield for cylindrical space structure

Chinese Journal of Aeronautics 2024年第10期37卷 294-312页

作者： Ji-Hun CHA Ji-Sub NOH Sarath Kumar SATHISH KUMAR dohyeon JIN Dae-Young lee Chun-Gon KIM Department of Aerospace Engineering Chosun UniversityGwangju 61452Republic of Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityGyeongsangnam-do 52828Republic of Korea Department of Aerospace Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Aerospace Engineering KAISTDaejeon 34141Republic of Korea

The multidisciplinary space environment,encompassing orbital debris,cosmic radiation,and solar radiative heat,poses significant risks to spacecraft and astronauts,necessitating efficient and effective shielding solutions.A multi-layer shield with wide spacing has been proven to be an effective way to shield the spacecraft from space debris impact;however,due to the limited volume of the payload fairing,it was not feasible to apply a multi-layer shield to the spacecraft *** the origami design,the shield maintains a compact form during launch and subsequently expands in outer space to enhance *** geometric analysis,it has been confirmed that the deployable multi-layer space shield can occupy less space than conventional space shield structures while expanding into wider shield intervals and multiple *** hypervelocity impact experiments,it was confirmed that as the bumper spacing of the multi-layer space shield expands,its ballistic performance becomes superior to conventional space *** deployable multi-layer space shield can reduce not only hypervelocity impacts but also solar radiative heat using the same mechanism as multi-layer *** cosmic radiation dose analysis,it has been confirmed that the multi-layer space shield is effective in cosmic radiation shielding compared to conventional space structures.

关键词： Hybrid composite Origami Hypervelocity impact Space environment Space debris Cosmic radiation

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Emerging low-cost,large-scale photonic platforms with soft lithography and self-assembly

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Photonics Insights 2023年第2期2卷 3-31页

作者： Hyunjung Kang dohyeon lee Younghwan Yang Dong Kyo Oh Junhwa Seong Jaekyung Kim Nara Jeon Dohyun Kang Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Advancements in micro/nanofabrication have enabled the realization of practical micro/nanoscale photonic devices such as absorbers,solar cells,metalenses,and *** the performance of these photonic devices has been improved by enhancing the design flexibility of structural materials through advanced fabrication methods,achieving large-area and high-throughput fabrication of tiny structural materials remains a *** this aspect,various technologies have been investigated for realizing the mass production of practical devices consisting of micro/nanostructural *** review describes the recent advancements in soft lithography,colloidal self-assembly,and block copolymer self-assembly,which are promising methods suitable for commercialization of photonic *** addition,we introduce low-cost and large-scale techniques realizing micro/nano devices with specific examples such as display technology and *** inferences presented in this review are expected to function as a guide for promising methods of accelerating the mass production of various sub-wavelength-scale photonic devices.

关键词： nanofabrication scalable manufacturing soft lithography colloidal self-assembly block copolymer self-assembly

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Widely tunable ultra-narrow-linewidth dissipative soliton generation at the telecom band

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Photonics Research 2020年第7期8卷 1100-1109页

作者： Chang Kyun Ha Ki Sang lee dohyeon Kwon Myeong Soo Kang Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141South Korea School of Mechanical and Aerospace Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141South Korea

Ultra-narrow-linewidth mode-locked lasers with wide wavelength tunability can be versatile light sources for a variety of newly emergent ***,it is very challenging to achieve the stable mode locking of substantially long,anomalously dispersive fiber laser cavities employing a narrowband spectral filter at the telecom ***,we show that a nearly dispersion-insensitive dissipative mode-locking regime can be accessed through a subtle counterbalance among significantly narrowband spectral filtering,sufficiently deep saturable absorption,and moderately strong in-fiber Kerr *** achieves ultra-narrow-linewidth(a few gigahertz)nearly transform-limited self-starting stable dissipative soliton generation at low repetition rates(a few megahertz)without cavity dispersion management over a broad tuning range of wavelengths covering the entire telecom *** unique laser may have immediate application as an idealized pump source for high-efficiency nonlinear frequency conversion and nonclassical light generation in dispersion-engineered tightly light-confining microphotonic/nanophotonic systems.

关键词： tunable narrow soliton

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Spider-inspired tunable mechanosensor for biomedical applications

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npj Flexible Electronics 2023年第1期7卷 444-452页

作者： Taewi Kim Insic Hong Yeonwook Roh Dongjin Kim Sungwook Kim Sunghoon Im Changhwan Kim Kiwon Jang Seongyeon Kim Minho Kim Jieun Park dohyeon Gong Kihyeon Ahn Jingoo lee Gunhee lee Hak-Seung lee Jeehoon Kang Ji Man Hong Seungchul lee Sungchul Seo Bon-Kwon Koo Je-sung Koh Seungyong Han Daeshik Kang Department of Mechanical Engineering Ajou UniversitySuwonKorea Department of Mechanical Engineering Pohang University of Science and TechnologyPohangKorea Department of Sustainable Environment Research Korea Institute of Machinery&MaterialsDaejeonKorea Department of Internal Medicine and Cardiovascular Center Seoul National University HospitalSeoulKorea Department of Neurology and Neurosurgery Ajou University School of MedicineSuwonKorea Department of Nano-chemical Biological and Environmental EngineeringSeokyeong UniversitySeoulKorea Institute on Aging Seoul National UniversitySeoulKorea

The recent advances of wearable sensors are remarkable but there are still limitations that they need to be refabricated to tune the sensor for target ***,biological sensory systems have the inherent potential to adjust their sensitivity according to the external environment,allowing for a broad and enhanced ***,we developed a Tunable,Ultrasensitive,Nature-inspired,Epidermal Sensor(TUNES)that the strain sensitivity was dramatically increased(GF~30k)and the pressure sensitivity could be tuned(10–254 kPa^(−1))by preset membrane *** sensor adjusts the sensitivity to the pressure regime by preset tension,so it can measure a wide range(0.05 Pa–25 kPa)with the best performance:from very small signals such as minute pulse to relatively large signals such as muscle contraction and *** verified its capabilities as a wearable health monitoring system by clinical trial comparing with pressure wire which is considered the current gold standard of blood pressure(r=0.96)and home health care system by binary classification of Old’s/Young’s pulse waves via machine learning(accuracy 95%).

关键词： Sensor adjust Spider

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