https://scholar.dgist.ac.kr/handle/20.500.11750/155 Department of Robotics and Mechatronics Engineering, DGIST 2026-05-24T17:16:52Z https://scholar.dgist.ac.kr/handle/20.500.11750/60361 Title: Transformation of rusted iron into an IDE-based sensor for ethanol detection and self-powered humidity sensing Author(s): Belal, Mohamed Ahmed; Hajra, Sugato; Bayoumy, Ahmed M.; Eldesouki, Mohammed H.; Kaja, Kushal Ruthvik; Panda, Swati; Ramu, Dandugudumula; Abd El-moneim, Ahmed; Achary, P. G. R.; Kim, Hoe Joon Abstract: Volatile organic compound (VOC) sensors and triboelectric nanogenerators (TENGs) are highly significant applications with broad potential across multiple fields, including non-invasive disease biomarker monitoring and sustainable energy harvesting for electronic devices. This study reports the synthesis of alpha-Fe2O3 nanoparticles derived from recycled iron screws using a closed-system nitric acid leaching process, followed by calcination, offering low-cost, eco-friendly, and added-value products that reduce the negative environmental impacts of waste materials. The synthesized material is thoroughly characterized to investigate its phase purity, surface morphology, and suitability for TENG and ethanolsensing applications. A spray coating technique was employed to deposit the alpha-Fe2O3 ink onto laserinduced graphene interdigitated electrodes (LIG-IDE) fabricated via CO2 laser engraving of a polyimide flexible substrate. The fabricated alpha-Fe2O3-based sensor exhibits multifunctional capabilities, owing to the material's biocompatibility. The alpha-Fe2O3-based sensor exhibits a high performance for ethanol detection at room temperature, with a sensor response of 47 and response/recovery times of 104/126 s, respectively, at 100 ppm. The TENG device exhibits stable output characteristics of 3 V and a maximum power of 9.5 nW. The electrical output from biomechanical motions confirms its potential for energy harvesting applications, and a further self-powered humidity sensor was demonstrated. These results highlight the excellent potential of alpha-Fe2O3 for both TENG applications and VOCs detection, recommending its use in environmental and industrial monitoring. 2026-06-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60359 Title: A Review of Soft Robotic Actuations for Minimally Invasive Implantable Devices and Sensors Author(s): Im, Jeonghyeon; Song, Sukho Abstract: Soft robotic actuations are emerging as a transformative paradigm for minimally invasive implantable devices and sensors. Unlike mechanically passive, rigid systems that often require open surgery, these systems enable compact insertion followed by programmable in situ deployment through diverse actuation mechanisms, including fluidic unfolding and eversion, magnetically guided deformation, thermally triggered shape-memory polymers, and electrically driven elastomeric actuators. In this review, we systematically categorize recent advances in soft robotic actuation strategies for implantable bioelectronics and analyze how these mechanisms facilitate minimally invasive delivery, adaptive conformal interfacing, and multifunctional operation across various organ systems. We further discuss complementary materials and structural innovations—such as bioresorbable platforms, tissue-adhesive interfaces, and mechanically optimized architectures—that enhance chronic stability and biocompatibility. Beyond summarizing recent demonstrations, this manuscript identifies two critical gaps hindering clinical translation: the lack of systematic evaluation of actuator-induced mechanical effects on biological tissues and the limited integration of intrinsic self- and environmental sensing for closed-loop operation. By outlining these challenges and emerging research directions, this review aims to provide a conceptual framework for the rational design and future development of next-generation minimally invasive soft robotic implants. 2026-02-28T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60330 Title: 풍선 타입 망막 자극장치 및 이의 제조방법 Author(s): 문현민; 김소희; 추남선 Abstract: A balloon type retinal stimulation device includes: a substrate unit having an insertion portion provided to be inserted into an eyeball; and a stimulation unit that is provided at one or both of one and the other surfaces of the substrate unit. The insertion portion is provided to be expandable and contractible as a fluid is injected into and discharged from an inside of the injection portion. When the insertion portion expands, one surface of the insertion portion is deformed to match a shape of the retina such that the stimulation unit is brought into close contact with the retina on which an image is formed, and the other surface of the insertion portion comes into close contact with an inner surface of the eyeball that is not a region of retina on which an image is formed, to support the insertion portion that is in contact with the region of retina on which an image is formed. https://scholar.dgist.ac.kr/handle/20.500.11750/60331 Title: 흡입력 측정 장치 Author(s): 이경제; De Oliveira Jean Gabriel; 홍다운; 김소희 Abstract: 본 발명은 흡입력 측정 장치에 관한 것이다. 본 발명의 일 실시예는 흡입력 측정 대상자의 구강에 삽입되는 구강 삽입부, 상기 구강 삽입부의 단부에 결합하는 지지부 및 상기 지지부 내부에 형성되어 상기 구강 삽입부의 내부와 외부를 연통시키는 개구부를 포함하는 인공 젖꼭지, 상기 지지부를 기준으로 상기 구강 삽입부와 대향되게 배치되는 압력 센서, 상기 인공 젖꼭지 또는 상기 압력 센서와 결합되며, 상기 압력 센서의 신호를 수신하는 수신부 및 외부 장치와 무선 데이터를 송수신하는 무선 통신부를 포함하는 본체를 포함하는 것을 특징으로 하는 흡입력 측정 장치를 제공한다.