Nanobead-reinforced outmost shell of solid-electrolyte interphase layers for suppressing dendritic growth of lithium metal

Department of Energy EngineeringDesign of catalyst support for high durability of oxygen electrocatalystPlating-stripping reversibility of lithium metal was improved by reinforcing the solid-electrolyte interphase (SEI) layer by inorganic nanobeads during formation of the SEI layer. The outmost SEI shell (OSS) was clearly identified, which is the SEI layer formed on current collectors (or lithium metal) before the first lithium metal deposition. The OSS was intrinsically brittle and fragile so that the OSS was easily broken by lithium metal dendrites growing along the progress of plating. Lithium metal deposit was not completely stripped back to lithium ions. On the other hand, lithium metal cells containing inorganic nanobeads in electrolyte showed high reversibility between plating and stripping. The nanobeads were incorporated into the OSS during the OSS formation. The nanobead-reinforced OSS having mechanically durable toughness suppressed dendritic growth of lithium metal, not allowing the dendrites to penetrate the OSS. In addition to the mechanical effect of nanobeads, the LiF-rich SEI layer formation was triggered by HF generated by the reaction of the moisture adsorbed on oxide nanobeads with PF6-. The LiF-rich composition was responsible for facile lithium ion transfer through the SEI layer and the OSS in the presence of nanobeads.clos

Understanding the Relationship Between Country Reputation and Corporate Reputation

Increasing attention has been paid to the relationship between country reputation and corporate reputation by both public and private sectors. This study aims to contribute to a better understanding of the relationship by investigating the factors that influence and are influenced by country reputation. In particular, this study examines (a) the impact of country reputation on foreign consumers’ attitudes toward brand and product purchase intentions, (b) the relationship between corporate reputation on country reputation, and (c) the mediating role of product image. Key findings of the study include the positive impact of corporate reputation on country reputation, and the mediating effects of product image between corporate reputation and country reputation

Designing for situations of elevated stress

This graduate thesis project examined the importance of information design in the context of problems where stressful situations can compromise the function of design solutions to communicate messages clearly and effectively

Self-supervised Equality Embedded Deep Lagrange Dual for Approximate Constrained Optimization

Conventional solvers are often computationally expensive for constrained optimization, particularly in large-scale and time-critical problems. While this leads to a growing interest in using neural networks (NNs) as fast optimal solution approximators, incorporating the constraints with NNs is challenging. In this regard, we propose deep Lagrange dual with equality embedding (DeepLDE), a framework that learns to find an optimal solution without using labels. To ensure feasible solutions, we embed equality constraints into the NNs and train the NNs using the primal-dual method to impose inequality constraints. Furthermore, we prove the convergence of DeepLDE and show that the primal-dual learning method alone cannot ensure equality constraints without the help of equality embedding. Simulation results on convex, non-convex, and AC optimal power flow (AC-OPF) problems show that the proposed DeepLDE achieves the smallest optimality gap among all the NN-based approaches while always ensuring feasible solutions. Furthermore, the computation time of the proposed method is about 5 to 250 times faster than DC3 and the conventional solvers in solving constrained convex, non-convex optimization, and/or AC-OPF.Comment: 11 pages, 5 figure

Cultural Discourses About Immigration, Mothering, and Disability in Korea: An Ethnographic Interview Study

This paper investigates ableism in the context of marriage-labor immigration in Korea, as demonstrated in the circulating discourses about mothering, cultural others, and deficits. I use examples from ethnographic interviews to underline the deficit perspective prevalent in Korean society, associating marriage-labor immigrant families with insufficiency, inferiority, and disability

GuidedMixup: An Efficient Mixup Strategy Guided by Saliency Maps

Data augmentation is now an essential part of the image training process, as it effectively prevents overfitting and makes the model more robust against noisy datasets. Recent mixing augmentation strategies have advanced to generate the mixup mask that can enrich the saliency information, which is a supervisory signal. However, these methods incur a significant computational burden to optimize the mixup mask. From this motivation, we propose a novel saliency-aware mixup method, GuidedMixup, which aims to retain the salient regions in mixup images with low computational overhead. We develop an efficient pairing algorithm that pursues to minimize the conflict of salient regions of paired images and achieve rich saliency in mixup images. Moreover, GuidedMixup controls the mixup ratio for each pixel to better preserve the salient region by interpolating two paired images smoothly. The experiments on several datasets demonstrate that GuidedMixup provides a good trade-off between augmentation overhead and generalization performance on classification datasets. In addition, our method shows good performance in experiments with corrupted or reduced datasets.Comment: Published at AAAI2023 (Oral