https://scholar.dgist.ac.kr/handle/20.500.11750/16350 2026-04-22T11:03:59Z https://scholar.dgist.ac.kr/handle/20.500.11750/60214 Title: Advanced frugal methodology for accessible precision materials processing and characterization Author(s): Park, Jun Hyun; Jin, Ho Jun; Kim, Simon; Lee, Su Eon; Ko, Young-chun; Kim, Jang-hwan; Kim, Bong Hoon Abstract: Frugal science offers transformative potential by democratizing access to scientific research through the replacement of specialized, high-cost laboratory instruments with accessible, low-cost alternatives. In this study, we introduce three universal advanced frugal toolkit that enable the cost-effective validation of experimental concepts across diverse engineering disciplines. We demonstrate that a repurposed household fan motor functions as an effective spin-coater substitute, exhibiting angular velocity stability that yields thin films with uniformity and morphology comparable to commercial systems. Furthermore, we establish that a common tack can be employed for nanoindentation to induce reproducible localized plastic deformation, facilitating the reliable comparative assessment of surface mechanical properties. Additionally, we show that diamond cutter-scribed guide trenches on silicon substrates successfully direct the graphoepitaxy of block copolymers, producing highly ordered nanopatterns comparable to those achieved by advanced EUV lithography. These accessible advanced frugal methods preserve critical performance characteristics while significantly lowering financial and logistical barriers, thereby supporting rapid prototyping, risk-averse decision-making, and inclusive innovation in both resource-limited and well-funded research environments. 2026-01-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59374 Title: Advances in skeletal muscle-inspired actuation using functional stimuli-responsive materials Author(s): Jo, Seong-Jun; Jin, Ho Jun; Lee, Jae Gyeong; Wie, Jeong Jae; Kim, Bong Hoon; Kim, Jaehwan Abstract: Skeletal muscles are fundamental biological systems that convert biochemical energy into mechanical work, enabling movement, force generation, and multifunctional tasks such as self-sensing and adaptive control. Artificial muscles based on stimuli-responsive materials have been developed to replicate these versatile functions. This review reorganizes existing literature from the perspective of skeletal-muscle mimetics by outlining three representative actuation strategies. The first involves contractile or extensional actuation that mirrors sarcomere motion. The second focuses on bending or twisting actuators that reproduce joint motions or localized muscle bending. The third highlights coiled fiber structures that directly imitate fascicles, reproducing both the motion and functional performance of the skeletal muscle. For each category, the advantages, limitations, and distinctive features of various material systems are summarized. In addition, representative studies are highlighted to demonstrate how these materials have been engineered to achieve skeletal-muscle-like performance. Beyond motion replication, advanced strategies are discussed that aim to realize realistic skeletal-muscle functions, including the integration of multi-stimuli-responsive materials and use of structural constraints to enable complex multimodal actuation. These material- and structure-level strategies are designed to be complementary, working synergistically to achieve more lifelike skeletal-muscle behavior. Finally, an outlook is provided on future research directions, with emphasis on material innovations, multifunctional integration, and adaptive design principles that support the transition from stimuli-responsive actuators to practical applications in soft robotics, wearable systems, and biomedical devices. https://scholar.dgist.ac.kr/handle/20.500.11750/59358 Title: When bubble meets sludge Author(s): Park, Jae Chul; Kim, Jang Hwan; Kim, Hojun; Kim, Bong Hoon Abstract: Piezoelectric ultrasound transducers generate transient cavitation that removes persistent fouling from mesh filters within seconds. This strategy enables stable, ultrahigh-flux wastewater treatment while substantially reducing energy demands. 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59273 Title: Logic-device-inspired mechanical computing system based on three-dimensional active components Author(s): Park, Jun Hyun; Kim, Jang Hwan; Chung, Ha Uk; Choe, Jun Seok; Kim, Hyokyeong; Lee, Su Eon; Kim, Simon; Jin, Ho Jun; Kim, Jiwoong; Lee, Heon; Kim, Jaehwan; Kim, Bong Hoon Abstract: Mechanical computing, utilizing mechanical deformation to perform calculations, has attracted significant attention as an innovative computing strategy for achieving high accuracy and exceptional physical robustness. However, its reliance on passive mechanical displacement limits its applicability for complex computations. This study presents a novel system that enables active light signal modulation through reversible mechanical deformation by integrating soft and 3D electronics. The proposed system features: 1) Optical fibers with optimized 3D cracks embedded in a low-modulus, high-elongation material, enabling strain-induced multimodal transitions. 2) Maximized stress concentration on the cracked fibers under strain, allowing them to function as active components for light modulation, which facilitates complex logic calculations and validates truth tables. 3) Multifunctional vibration sensing capabilities, illustrating the scalability of strain inputs and the potential for dynamic applications, such as soft robotics. These findings underscore the potential of this approach as a computational platform for mechanical motion-based technologies. 2025-10-31T15:00:00Z