https://scholar.dgist.ac.kr/handle/20.500.11750/1929 2026-04-04T16:38:02Z 2026-04-04T16:38:02Z 최유빈 류채현 김항겸 박희정 안시온 박상현 김회준 https://scholar.dgist.ac.kr/handle/20.500.11750/57764 2025-07-25T03:23:11Z 2024-04-24T15:00:00Z

Title: 초전효과 기반의 로봇그리퍼 통합 온감 센서 Author(s): 최유빈; 류채현; 김항겸; 박희정; 안시온; 박상현; 김회준 Abstract: 촉감센서는 증강현실과 가상현실이 발달함에 따라 인간과 사람을 연결하기 위한 수단으로 많은 관심을 받고 있다. (1) 특히 온도측정은 촉감센싱에 있어 중요한 역할을 한다. (2) 그러나 사람이 물건을 인식할 경우엔 열전도도, 열확산도, 열용량 등 다양한 열적 특성에 영향을 받는다. 그러나 기존의 온도센서는 절대적인 온도만을 측정함으로써 사람의 온감을 측정하는 것에는 한계가 있다. 이 연구는 초전효과 기반의 온감센서를 제안한다. 특히 PZT 는 잘 알려진 초전물질이다. 이를 이용해 사람이 물체를 만졌을 때 발생하는 현상을 모사하여 온감을 측정한다. 그리고 온감센서를 로봇그리퍼에 결합하여 실시간으로 일정한 조건의 온감을 측정한다.

2024-04-24T15:00:00Z Choi, Yoobin Ryu, Chaehyun Kim, Hang Gyeom Jang, Il Ryu Park, Jeonhyeong Lim, Hyeoncheol Kim, Hoe Joon https://scholar.dgist.ac.kr/handle/20.500.11750/57517 2025-07-25T02:43:13Z 2024-01-21T15:00:00Z

Title: Self-Powered Pyroelectric Warmth Sensor for Robotic Integration and Materials Recognition Author(s): Choi, Yoobin; Ryu, Chaehyun; Kim, Hang Gyeom; Jang, Il Ryu; Park, Jeonhyeong; Lim, Hyeoncheol; Kim, Hoe Joon Abstract: This work presents the self-powered warmth sensor based on the pyroelectric effect. Pyroelectric materials are generally used for energy harvesting and temperature sensing. For the first time, we showcase warmth sensing using the pyroelectric effect. The pyroelectric tactile sensor comprises a lead zirconate titanate (PZT) attached to a Peltier heater. When the heated pyro-sensor contacts a cooler object, there is an instant drop in sensor temperature due to the conduction heat loss. Such temperature drop generates pyroelectric current, and different materials produce distinguishable outputs, as the temperature change depends on the heat transfer rate. As a result, direct sensing of warmth depends on not only the temperature but also the thermal properties of the object and distinguishing different materials using the pyro-sensor integrated robotic gripper. © 2024 IEEE.

2024-01-21T15:00:00Z Jang, Il Ryu Jung, Soon In Ryu, Chaehyun Park, Jeonhyeong Padhan, Aneeta Manjari Yu, Jaesok Keum, Hohyun Kim, Hoe Joon https://scholar.dgist.ac.kr/handle/20.500.11750/56841 2025-07-25T02:41:03Z 2023-06-26T15:00:00Z

Title: Graphene Oxide Integrated Surface Acoustic Wave Humidity Sensor with Simultaneous Multi-Frequency Operation Author(s): Jang, Il Ryu; Jung, Soon In; Ryu, Chaehyun; Park, Jeonhyeong; Padhan, Aneeta Manjari; Yu, Jaesok; Keum, Hohyun; Kim, Hoe Joon Abstract: Humidity is crucial in agriculture, electronic device fabrication, and climate change. In particular, as the coronavirus outbreak globally spreads, airborne water moisture has been considered the carrier of airborne viruses. Therefore, there is much need to develop accurate and precise humidity sensors to predict and prevent coronavirus transmission. This paper presents the multi-frequency surface acoustic wave (SAW) platform with graphene oxide (GO) decoration for humidity sensing. The novel claims include (1) the localized integration of GO with ng-resolution using an electrospray deposition (ESD) system, (2) highly sensitive and stable sensing performances by selecting proper operating resonant frequency depending on relative humidity (RH) levels, and (3) use of the developed sensor for face mask inspection. Our findings suggest that the multi-frequency SAW ensures high measurement sensitivity over a large RH range, further improving the current state of the resonator-based humidity sensors. © 2023 IEEJ.

2023-06-26T15:00:00Z Park, Jeonhyeong Lim, Hyeoncheol Ryu, Chae Hyun Jung, Soon In Jang, Il Ryu Kim, Hoe Joon https://scholar.dgist.ac.kr/handle/20.500.11750/56840 2025-07-25T02:41:04Z 2023-06-28T15:00:00Z

Title: Planar Metastructure-based Gas Sensors for High Stretchability and Stable NO2 Sensing Author(s): Park, Jeonhyeong; Lim, Hyeoncheol; Ryu, Chae Hyun; Jung, Soon In; Jang, Il Ryu; Kim, Hoe Joon Abstract: The paper presents a flexible and stretchable carbon nanotube (CNT) based gas sensor fabricated on a planar metastructure, kirigami substrate with anatase TiO2 functionalization for improved NO2 sensing performances with high stretchability. The developed kirigami-based sensor possesses a network of notches with high softness and stretchability, ensuring a stable sensor operation of up to 80% strain. Such a high strain range overcomes the current limitation of gas sensors, which generally utilize rather brittle and rigid sensing materials. The innovative claims include (1) the utilization of kirigami architecture to mitigate the uniaxial strain effect and (2) the enhancement of sensor performance regarding the sensitivity and recovery time owing to TiO2 functionalization. Mechanical properties of the kirigami structure can be analyzed via stress-strain relation, and the sensing material properties are characterized using Fourier-transform infrared spectroscopy (FT-IR) and Raman spectroscopy. The suggested kirigami-based gas sensors could be applied to wearable and stretchable gas sensing applications. © 2023 IEEJ.

2023-06-28T15:00:00Z