https://scholar.dgist.ac.kr/handle/20.500.11750/10155 2026-04-04T10:04:45Z 2026-04-04T10:04:45Z Bae, Sunggyu Song, Seongkyu Jeong, Soon Moon Park, Kyungseo https://scholar.dgist.ac.kr/handle/20.500.11750/60098 2026-02-19T05:40:11Z 2025-10-21T15:00:00Z

Title: MelumiTac: Vision-based Tactile Sensor Using Mechanoluminescence for Dynamic Tactile and Nociceptive Perception Author(s): Bae, Sunggyu; Song, Seongkyu; Jeong, Soon Moon; Park, Kyungseo Abstract: This paper presents MelumiTac, a vision-based tactile (ViTAC) sensor enhanced with mechanoluminescent (ML) materials that emit green light under dynamic tactile stimuli. The integration of an ML elastomer generates self-illumination in response to dynamic tactile stimuli, enabling direct visualization of both dynamic tactile events and nociceptive responses while simultaneously tracking deformation in real-time. Experimental evaluations involving cyclic loading, in-plane motion, and piercing reveal a strong correlation between ML emission, stress rate, and localized deformation, thereby validating its multi-modal tactile sensing capabilities. Additionally, frame-by-frame analysis offers rich insights into the contact dynamics during physical interactions. These improvements, implemented within a small form factor of conventional ViTac sensor, render the approach highly accessible. Thus, we expect that the proposed solution will offer practical and unique advantages to engineers developing and applying vision-based multi-modal tactile sensors.

2025-10-21T15:00:00Z Lim, Geumha Hoang, Van-Quy Lee, Jaebaek Kang, Jin-Kyu Yang, Kee-Jeong Sung, Shi-Joon Kim, Dae-Hwan Jo, William https://scholar.dgist.ac.kr/handle/20.500.11750/60087 2026-02-11T13:10:14Z 2025-06-10T15:00:00Z

Title: Strategic interfacial layers for enhanced charge transport in Sb2Se3 solar cells Author(s): Lim, Geumha; Hoang, Van-Quy; Lee, Jaebaek; Kang, Jin-Kyu; Yang, Kee-Jeong; Sung, Shi-Joon; Kim, Dae-Hwan; Jo, William Abstract: This study demonstrates the enhancement of charge transport properties in Sb2Se3 solar cells through the introduction of interfacial interlayers. MoSe2 and SnOx were selected and optimized as an interlayer for back and front interface, respectively. The improved ohmic contact quality at the back interface was revealed, along with the preferential growth of Sb2Se3, leading to the reduction of carrier recombination. The effect of SnOx on interfacial carrier extraction between the absorber and buffer layer was discussed with the changes in surface potential distribution and energy band structure of CdS buffer layer. With both interlayers, the best cell achieved 6.247% PCE, recording the highest performance for co-evaporation processed Sb2Se3 solar cells and highlighting the importance of interface engineering in device optimization.

2025-06-10T15:00:00Z Son, Byungrak Cho, Changhak Son, Sujin Seul, Jin-hyun Jon, Yong Jun Kim, Bonghwan Byun, Taeyoung https://scholar.dgist.ac.kr/handle/20.500.11750/59029 2026-02-11T13:10:15Z 2025-01-20T15:00:00Z

Title: Development of a Smartphone-Integrated Microalgae Photobioreactor for CO₂ Capture and Oxygen Generation in Indoor Air Purification Systems Author(s): Son, Byungrak; Cho, Changhak; Son, Sujin; Seul, Jin-hyun; Jon, Yong Jun; Kim, Bonghwan; Byun, Taeyoung Abstract: This study introduces an innovative microalgae-based air purification system designed to enhance indoor air quality by capturing carbon dioxide (CO₂) and generating oxygen (O₂). The system integrates a 1.5 L photobioreactor with advanced control and monitoring features accessible via a smartphone application. The photobioreactor employs RGB-LED lighting and an air pump to facilitate optimal microalgae growth. The system autonomously adjusts light and airflow based on real-time data, reducing the need for user intervention. A smartphone app allows additional manual control while providing visual feedback on microalgae growth through a six-stage color tracking method. Simulations were conducted to evaluate system performance, demonstrating a CO₂ capture rate of up to 0.55g/L/day and an O₂ generation rate of approximately 0.20g/L/day—improvements of 22% and 25%, respectively, over previous studies. The IoT control system showed high reliability with a precision of 93%, recall of 91%, and F1-score of 92%. The results indicate that the proposed system effectively enhances air purification efficiency and offers a user-friendly approach to indoor environmental management. © 2025 Elsevier B.V., All rights reserved.

2025-01-20T15:00:00Z Sung, Shi-Joon Park, Si-Nae Kim, Dae-Hwan Kang, Jin-Kyu https://scholar.dgist.ac.kr/handle/20.500.11750/58985 2025-08-29T09:40:10Z 2016-08-23T15:00:00Z

Title: Nanostructured inorganic CZTS thin film prepared by facile solution process and its application to 3D p-n junction solar cells Author(s): Sung, Shi-Joon; Park, Si-Nae; Kim, Dae-Hwan; Kang, Jin-Kyu

2016-08-23T15:00:00Z