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Gadolinium-Doped CeO2 Gas Sensor for H2S Sensing
Changhyun Jin, Sangwoo Kim, Dong Eung Kim, Ali Mirzaei, Jong Wook Roh, Sun-Woo Choi, Myung Sik Choi
Korean J. Met. Mater. 2023;61(6):414-421.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.414

Abstract
Dihydrogen sulfide (H2S) gas has a flammable nature and is one of the most toxic and dangerous gases. Even small concentrations can be fatal to humans. Herein, we investigated the H2S gas-sensing features of commercial pristine cerium oxide (CeO2 ) and gadolinium (Gd)-doped CeO2 (GDC) nanoparticles. First, the sensing materials..... More

                
The Mechanism behind the High Thermoelectric Performance in YbCd2-xMgxSb2
YbCd2-xMgxSb2 열전 합금의 열전 성능 증대 메커니즘 분석
Seung-Hwan Kwon, Sang-il Kim, Minsu Heo, Won-Seon Seo, Jong Wook Roh, Heesun Yang, Hyun-Sik Kim
권승환, 김상일, 허민수, 서원선, 노종욱, 양희선, 김현식
Korean J. Met. Mater. 2023;61(3):198-205.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.198

Abstract
YbCd2Sb2 is a promising Zintl compound for waste heat recovery applications due to its low thermal conductivity, originating from its complex crystal structure. Many strategies such as alloying or doping have been suggested to further reduce the thermal conductivity of YbCd2Sb2 to improve its thermoelectric performance. However, the..... More

                
Method for Predicting Thermoelectric Module Efficiency Using MATLAB/Simulink
매트랩/시뮬링크 simulation model을 이용한 열전 모듈의 효율 예측
Nayoung Lee, Sungwook Ye, Rahman Jamil Ur, Jang-Yeul Tak, Jung Young Cho, Won Seon Seo, Weon Ho Shin, Walter Commerell, Woo Hyun Nam, Jong Wook Roh
이나영, 예성욱, Rahman Jamil Ur, 탁장렬, 조중영, 서원선, 신원호, Walter Commerell, 남우현, 노종욱
Korean J. Met. Mater. 2021;59(11):829-837.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.829

Abstract
Development new high-performance thermoelectric materials for more efficient power generation systems and eco-friendly refrigerating systems has been challenging. Over the past few decades, thermoelectric studies have been focused on increasing the thermoelectric properties of materials. However, for conventional applications, developing of thermoelectric devices or modules with lower cost and..... More

                   Crossref 1
Ultraviolet Light-Responsive Photorheological Fluid for Sensors and Actuators Realized by Phosphorescence Effects and LSTM RNN
Min Young Cho, Suman Timilsina, Jong Wook Roh, Walter Commerell, Ho Geun Shin, Yong-Nam Kwon, Ji Sik Kim
Korean J. Met. Mater. 2021;59(5):346-353.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.346

Abstract
A photo-rheological fluid (PRF) is a smart fluid which exhibits different viscosity under UV irradiation. A PRF is comprehensively presented in this work, with particular focus on its responses under UV off/on conditions. The isomeric conversion from SP to MC and vice versa under UV off and on, respectively, showed..... More

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