https://scholar.dgist.ac.kr/handle/20.500.11750/10136 2026-07-01T23:10:11Z https://scholar.dgist.ac.kr/handle/20.500.11750/60441 Title: 원자력 발전소 방재 방법 및 이를 수행하는 시스템 Author(s): 이준호; 인수일; 김태규; 이상훈; 이규정; 손병락 Abstract: 본 발명은 방사능을 측정할 수 있는 방사능 측정 장치를 장착한 드론을 활용하여 원자력 발전소 내부 또는 부지나, 주변부에 대한 국지적 실시간 방사능 수치 정보를 수집하고, 함께 작동하는 풍향풍속계를 통해 현장의 기상 정보를 통합하여 방사능 확산 지도와 대피로를 산출하여, 통신망을 통해 대피로를 안내하기 위한 원자력 발전소 방재 방법 및 이를 수행하는 시스템에 대한 것으로, 원전 재난시 최적의 드론 및 드론 스테이션을 구동할 수 있으며, 다양한 상황별 프로그램을 구상하여 적합한 정보를 확인 및 명령함으로써 시스템을 올바르게 작동하고자 하고, 시뮬레이션을 통해 대피로를 최적화하여 원전재난 대피 시스템을 검증하고, 나아가 빅데이터 생성 및 활용을 수행할 수 있다. https://scholar.dgist.ac.kr/handle/20.500.11750/60426 Title: 태양전지 : 전류-전압 측정 프로그램 Author(s): 김대환; 김욱현; 양기정; 손대호 https://scholar.dgist.ac.kr/handle/20.500.11750/60422 Title: Enhanced Wide-Bandgap Perovskite Solar Cells via Kinetically Optimized C60 Electron-Transport Layers Author(s): Kumar, Naveen; Jo, Hyo Jeong; Son, Dae-Ho; Lee, Jaebaek; Ali, Amanat; Kang, Jin-Kyu; Yang, Kee-Jeong; Sung, Shi-Joon; Jeong, Hyeonjong; Cho, Chang-Hee; Kim, Dae-Hwan; Hwang, Dae-Kue Abstract: High-efficiency tandem solar cells require wide-bandgap (WBG) perovskites as the top absorber, yet such devices often suffer severe nonradiative recombination, voltage losses, and halide segregation. This work demonstrates that carefully controlling the deposition kinetics of the fullerene electron-transport layer (ETL) offers an elegant route to overcome these issues without complex passivation strategies. WBG perovskite solar cells using a FA(0)(.8)Cs(0)(.2)Pb(I0.8Br0.2)(3) absorber were fabricated in a p-i-n architecture with C-60 ETLs deposited at three different evaporation rates. When the C-60 deposition rate was slowed to 0.1 & Aring; s(-1), our devices achieve a 20.4% PCE with a relatively low Voc deficit (~0.48 eV) without complex molecular passivation, 2D/3D heterostructures, or multistep surface reconstruction. The improvement originates from suppressed nonradiative recombination and reduced shunt leakage: The slow-deposited C-60 film yields a higher open-circuit voltage (~1.17 V), increased fill factor (80%), and reduced saturation current density and trap-state density compared with faster deposition. Photoluminescence, impedance spectroscopy, and transient photovoltage analyses reveal that slower deposition produces a compact and well-ordered C-60 layer which minimizes trap-assisted recombination, decreases Urbach energy (16.68 meV), and lowers the ideality factor (n approximate to 1.33). Structural characterizations confirm improved C-60 molecular interface and smoother morphology at slow deposition rates. This work provides a simple processing guideline for high-performance WBG perovskite solar cells and offers valuable insights for scalable tandem cell fabrication. 2026-03-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60412 Title: Quantitative Analysis of Ionic Channel Network Variation in Nafion Under Continuous Annealing Using Current-Sensing Atomic Force Microscopy Author(s): Kwon, Osung; Son, Byungrak Abstract: Proton exchange membranes (PEMs) are essential for PEM fuel cells, with proton conductivity arising from the hydration-induced ionic channel network. PEM performance can be enhanced through pretreatments, such as annealing, which reconstruct the ionic channels. This study investigates the ionic channel network variation in Nafion 212 under continuous annealing at 90 degrees C using current-sensing atomic force microscopy (CSAFM). A nanoscale PEM fuel cell was formed with a Pt-coated CSAFM tip and Pt-coated Nafion surface. Topography and surface roughness analyses revealed geometrical changes from annealing. Current-sensing images and histograms qualitatively assessed local conductance and ionic channel distribution. The ionic channel network density was quantitatively evaluated using the number of protons moving through the ionic channel network (NPMI), derived from CSAFM and electrodynamics principles. NPMI directly reflects ionic channel density. From the unannealed state to 60 h, NPMI increased linearly at 1 & times; 104 h-1, indicating enhanced channel formation. Beyond 60 h, NPMI decreased linearly at 1.9 & times; 105 h-1, reflecting progressive network degradation. As the ionic channel network increases, the number of protons reaching the membrane surface also increases, whereas in the opposite case it decreases. Thus, NPMI becomes evaluation criterion for ionic channel network density. These findings systematically link nanoscale structural changes to ionic channel reconstruction and proton transport in Nafion 212, providing insight into PEM performance evolution under thermal treatment. 2026-04-30T15:00:00Z