Jae-Uk Lee’s research while affiliated with Korea Institute of Energy Research and other places

... Analytical techniques such as gas chromatography (GC), mass spectrometry (MS), and Fourier-transform infrared spectroscopy (FT-IR) play vital roles in identifying and quantifying trace impurities [53][54][55][56][57][58][59][60]. These methods provide the precision and reliability required to meet the specifications outlined by international standards such as ISO 14687 [61], which governs the quality of hydrogen used in fuel cells and other critical applications [62][63][64][65]. Recent advancements in analytical technologies, including cavity ring-down spectroscopy (CRDS) and ion chromatography (IC), have further enhanced the ability to detect ultra-trace levels of contaminants [66][67][68][69][70]. ...

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Hydrogen Purity: Influence of Production Methods, Purification Techniques, and Analytical Approaches

... The method has been used in previous studies both in conjunction with electronic structure calculations, in particular plane wave-based density functional theory calculations (40)(41)(42)(43) and in combination with empirical potentials (44)(45)(46). The transport of mass is prevalent both along the interplanar and intraplanar crystallographic axis (47)(48)(49). Defect locations are recorded at designated fine intervals and visualized with OVITO. Figures 4 and 5 show the transition of self-interstitial Mo along the same plane i.e. < 111 > and from < 100 > plane to < 111 > plane, respectively. ...

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Kinetics of substitutional Xe and self-interstitial Mo in γ U–10Mo: a molecular dynamic study

... The model determined the time required for the entire distillation column to stabilize after process disturbances, such as changes in feed flow rate or concentration. Urm et al. [33,34]. evaluated the thermodynamic properties of cryogenic distillation columns for hydrogen isotope separation using the Peng-Robinson Twu equation of state. ...

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Research Progress in Tritium Processing Technologies: A Review

... Cryogenic distillation is currently the only industrial-scale method for obtaining high concentrations of tritium. Although it has been applied in industry for separating tritium and water, several challenges remain in device operation, such as uneven cooling in the distillation column and inefficient transfer of cooling power to the gas mixture [24][25][26]. These issues complicate the separation dynamics. ...

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Research Progress in Tritium Processing Technologies: A Review

... 21 The crystal structures for UN and U 2 N 3 were obtained from previous DFT investigations of electronic structure. [22][23][24][25] The structure of U 4 N 7 is predicted and obtained from the Materials Project database, 24 as experimental structural characterization is primarily limited to lattice constants. 26 The calculations were performed using the guidelines in the work of Gryaznov and coworkers, 27 which consists of using DFT plus uranium with a uranium value of 1.85 eV and the neglect of magnetism to approximate the high-temperature paramagnetic states of the uranium compounds. ...

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Toward an In-Depth Material Model for Cermet Nuclear Thermal Rocket Fuel Elements

... However, widespread adoption of CCS is hindered by high operational costs, uncertainties in storage effectiveness, and potential environmental risks. To overcome these challenges, researchers have increasingly turned to advanced optimization and decision-making approaches, particularly machine learning (ML) and reinforcement learning (RL), to improve the efficiency and reliability of CCS systems [1,2]. ...

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Machine Learning and Reinforcement Learning-Driven Optimization of Carbon Capture and Storage Processes and Their Environmental Impact Assessment

... The GDP is constituted by three basic elements: states, tasks and equipment, which can be combined in two kinds of representations: state-task-network (STN) and state-equipmenttask (SET). The STN representation has been previously used for making decisions in fusion fuel cycle ( Lee et al., 2016 ), modeling energy supply chains ( Kalaitzidou et al., 2016 ), and scheduling in pharmaceutical manufacturing ( Casola et al., 2016 ), among others. Lee et al. (2016) stated that the network-based representations, including STN, allow representing complex system configurations with several operational conditions. ...

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Synthesis of Mass Exchange Networks: A Novel Mathematical Programming Approach

... Thus, it has been seeking alternatives to reduce carbon dioxide emission, as well as the development of strategies for carbon capture and storage (CCS) and carbon capture and utilization (CCU). The former aims at CO 2 emission decrease through the compression and storage of the referred gas in rock formations and tanks [2]. The latter comprehends the main greenhouse gas utilization in sustainable development, as renewable-based energy generation, since carbonic gas is a chemical feedstock of great value [3]. ...

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Improvement of Ni-based catalyst properties and activity for dry reforming of methane by application of all-in-one preparation method

... 4,5 Carbon capture and storage (CCS) is considered to be an effective method to prevent the CO 2 from industrial processes into the atmosphere because of its economic, safety, and site-specific advantages. 6 In the CCS process, it is unavoidable to capture impurities, such as N 2 , O 2 , Ar, NO x , SO 2 , H 2 S, CO, H 2 , and CH 4 . 7 The specific impurities and their concentrations can vary significantly depending on the type of fuel, capture process (postcombustion, pre-combustion, and oxy-combustion), and separation technology (absorption, membranes, cryogenic distillation, gas hydrates, and chemical looping) used. ...

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Gaseous PVTx Properties of the CO 2 –N 2 O Binary Mixture: Experiment and Simulation

... Given the rising pace of emissions into the atmosphere, it is critical to guarantee that CO 2 emissions from burning of fossil fuel and other emerging sources, such as the cement industry, are captured and reduced as soon as possible before they are released into the environment. As a result, the pollution caused by the release of these gases will be reduced, and efforts will be made to use the CO 2 collected in the development of cleaner and efficient energy systems (Han et al., 2012;Huang et al., 2008;Martunus et al., 2008). ...

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INAUGURATION OF KIFILIDEEN TRINOMIAL THEOREM OF NEGATIVE POWER OF – N BY EMPLOYING MATRIX AND STANDARDIZED TECHNIQUES