Publications by authors named "Sungjun Choi"

Bacterial extracellular vesicles (bEVs) have therapeutic potential by mimicking the effects of the microbiome. Here, we characterized bEVs from eight gram-positive Lactobacillales strains, evaluating their therapeutic potential. In primary characterization, Lactobacillus paracasei produced the largest bEVs (82.

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Two-level systems based on point defects in dielectric oxides offer promising entropy source for random number generators. The random telegraph noise (RTN) generated by the two-level systems is ideal for creating random bit-strings for advanced computing and cryptographic technologies. However, in classical oxide systems, RTN signals often suffer from instability due to undesired defect migration and metastable electronic states.

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Polydeuteration has emerged as a key strategy in the development of pharmaceuticals and functional organic materials, advancing beyond monodeuteration and trideuteromethylation. We have developed methods for the polydeuteration of a wide range of organic compounds through Pd-catalyzed directed sp C-H activation and nondirected sp C-H activation, using readily available deuterium source, AcOH- . This approach addresses the challenge of facilitating both directed and nondirected C-H functionalization of electronically and sterically diverse (hetero)aromatic compounds through the use of a versatile [2,2'-bipyridin]-6(1)-one (BpyOH) ligand.

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Photodetectors that detect near-infrared (NIR) light serve as important components in contemporary energy-efficient optoelectronic devices. However, detecting the low-energy photons of the NIR light has long been challenging since the ease of photoexcitation inevitably involves increasing the background current in the dark. Herein, we report the atomic-scale interface modification in SrRuO/LaAlO/Nb-doped SrTiO (SRO/LAO/Nb:STO) heterostructures for NIR photodetection.

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Article Synopsis
  • A study was conducted to determine how alternative biologics and different disease groups influence the survival rates of biologic drugs used to treat psoriasis and psoriatic arthritis (PsA).
  • Using data from a nationwide cohort in Korea, the research analyzed 5,634 episodes of biologic treatment over a ten-year period.
  • Findings revealed that factors like age, sex, and prior treatment impacted drug discontinuation rates, with the introduction of new biologics leading to increased discontinuation of existing treatments like ustekinumab and adalimumab.
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Background: With accumulating evidence that achieving a 90% improvement in the Psoriasis Area and Severity Index score (PASI90) has better correlation with improved health-related quality of life as compared to PASI75 achievement, there has been demand for establishing new treatment goals for psoriasis. We investigated whether the short-term PASI90 achievement would predict longer drug survival as compared to PASI75 achievement.

Objective: We investigated whether the short-term PASI90 achievement would predict longer drug survival as compared to PASI75 achievement.

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Background: The inflammatory lesions of acne leave scars which greatly affect patients' quality of life. Treatment options targeting both acne and acne scars are still lacking.

Objectives: To evaluate the clinical efficacy of epidermal growth factor ointment (EGFO) on acne and acne scars.

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Background There is emerging evidence that rosacea, a chronic cutaneous inflammatory disease, is associated with various systemic diseases. However, its association with cardiovascular disease (CVD) remains controversial. We aimed to investigate whether patients with rosacea are at increased risk of developing CVD.

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Background: Misclassification of study designs of journals can hinder the readers from assessing the strengths and weaknesses of the study and evaluating the applicability of the study in the real-world setting. However, it seems that it is common for authors to neglect to classify the study design.

Objective: We aimed to evaluate the accuracy of the classification of study designs and examine the common errors.

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We propose a promising electrochemical analysis tool based on the distribution of relaxation times (DRT) to quantify interfacial resistances towards a comprehensive understanding of complex solid-state interfacial phenomena in sulfide-based all-solid-state batteries (ASSBs). Using DRT-assisted impedance analysis, we identify a new resistance component in the range of 10-10 Hz of 3.5 and 0.

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Background: There are few studies that directly compared different interventions to improve medical students' clinical reasoning for dermatologic conditions.

Objective: To investigate the effectiveness of adding practice with reflection and immediate feedback on traditional dermatology electives in improving medical students' ability in evaluating skin lesions.

Methods: The participants were fourth-year medical students of Seoul National University College of Medicine, Korea, who were enrolled to take a 2-week dermatology elective course (n = 87).

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Article Synopsis
  • A new superionic halogen-rich Li-argyrodite (HRLA) is introduced as a solid electrolyte for all-solid-state batteries, showcasing higher Li-ion conductivity than previously reported materials.
  • The innovative synthesis process combines ultimate-energy mechanical alloying (UMA) and rapid thermal annealing (RTA), allowing for 70% crystallization in one step, with further improvement to 82% crystallization in just 25 minutes.
  • The HRLA demonstrates strong performance as a solid electrolyte in various configurations, achieving a Li-ion conductivity of 10.2 mS/cm at 25 °C and delivering a capacity of 114.2 mAh/g at 0.5 C.
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Background: Herbal extracts with fewer adverse effects can be an alternative to these drugs because they can target various molecular pathways of acne pathogenesis.

Objectives: To evaluate the clinical efficacy of herbal extracts (mangosteen, , L., Thunb) for the treatment of mild to moderate acne vulgaris.

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Background: Evidence on whether functional surgery is not inferior to amputation for the treatment of in situ or minimally invasive (Breslow thickness ≤0.5 mm) nail melanoma is limited.

Objective: To investigate the difference in local recurrence between the 2 interventions for in situ or minimally invasive nail melanoma using available published studies.

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We probe the electrochemical performance of Li-argyrodite-based all-solid-state batteries under deep-freezing conditions (-30 °C) using electrochemical impedance spectroscopy. The performance deterioration is mainly caused by the increased interfacial resistances of electrolyte and active materials resulting from the slow kinetics of Li-ion transport in solid materials at low temperatures.

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Despite the importance of CO methanation for eco-friendly carbon-neutral fuel recycling, the current technologies, relying on catalytic hydrogenation over metal-based catalysts, face technological and economical limitations. Herein, we employ the steam hydrogenation capability of proton conductors to achieve collateral CO methanation over the Ni/BaZrYO catalyst, which is shown to outperform its conventional Ni/AlO counterpart in terms of CH yield (8% higher) and long-term stability (3% higher for 150 h) at 400 °C while exhibiting a CH selectivity above 98%. Moreover, infrared and X-ray photoelectron spectroscopy analyses reveal the appearance of distinct mobile proton-related OH bands during the methanation reaction.

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The ion-transport phenomenon, determined by the interaction of strain and electrostatic energy, is one of the most important examples that confirms the effects of the polymorphism and atomic morphology. We investigated the correlation between the structural morphology and Li-ion conduction characteristics in α-LiPS, a high-temperature phase of the LiPS, using ab initio molecular dynamics (AIMD) calculations. We successfully reproduced the thermal disorder and partial occupancy observed at high temperatures by AIMD and confirmed the Li-ion sites and its migration pathways.

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The composite cathode of an all-solid-state battery composed of various solid-state components requires a dense microstructure and a highly percolated solid-state interface different from that of a conventional liquid-electrolyte-based Li-ion battery. Indeed, the preparation of such a system is particularly challenging. In this study, quantitative analyses of composite cathodes by three-dimensional reconstruction analysis were performed beyond the existing qualitative analysis, and their microstructures and reaction interfaces were successfully analyzed.

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We explored oxygen-ion transport in highly doped CeO through density-functional theory calculations. By applying biaxial strain to 18.75 mol % CeO:Gd, we predicted the average migration-barrier energy with six different pathways, with results in good agreement with those of experiments.

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High-temperature chemical reactions are ubiquitous in (electro) chemical applications designed to meet the growing demands of environmental and energy protection. However, the fundamental understanding and optimization of such reactions are great challenges because they are hampered by the spontaneous, dynamic, and high-temperature conditions. Here, we investigated the roles of metal catalysts (Pd, Ni, Cu, and Ag) in the high-temperature reverse water-gas shift (RWGS) reaction using in-situ surface analyses and density functional theory (DFT) calculations.

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