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454 results on '"Kim, Seul‐Gi"'

105. Stratifying Non-Small Cell Lung Cancer Patients Using an Inverse of The Treatment Decision Rules - Validation Using Electronic Health Records With Application to An Administrative Database 

Author

Kim, Min-Hyung, primary, Park, Sojung, additional, Park, Yu Rang, additional, Ji, Wonjun, additional, Kim, Seul-gi, additional, Choo, Minji, additional, Hwang, Seung-sik, additional, Lee, Jae Cheol, additional, Kim, Hyeong Ryul, additional, and Choi, Chang-Min, additional

Published
2021
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139. Dual‐labeled prostate‐specific membrane antigen (PSMA)‐targeting agent for preoperative molecular imaging and fluorescence‐guided surgery for prostate cancer.

Author

Kim, Myoung Hyoun, Kim, Seul‐Gi, and Kim, Dae‐Weung

Subjects
*PROSTATE-specific antigen, *PROSTATE surgery, *PROSTATE cancer, *SCINTILLATION cameras, *ONCOLOGIC surgery
Abstract

The objective of this study was to report the synthesis and characteristics of a dual modality imaging agent, Tc‐99m GRFLTGGTGRLLRIS‐GHEG‐ECG‐K(‐5‐carboxy‐X‐rhodamine)‐NH2 (GRFLT‐ECG‐ROX), and to verify its feasibility as both molecular imaging and intraoperative guidance agent. GRFLT‐ECG‐ROX was synthesized using Fmoc solid‐phase peptide synthesis. Radiolabeling of GRFLT‐ECG‐ROX with Tc‐99m was accomplished using ligand exchange via tartrate. Binding affinity and in vitro cellular uptake studies were performed. Gamma camera imaging, biodistribution, and ex vivo imaging studies were performed using LNCaP and PC‐3 tumor‐bearing murine models. Surgical removal of tumor nodules in murine models with peritoneal carcinomatosis was performed under a fluorescence imaging system. After radiolabeling procedures with Tc‐99m, Tc‐99m GRFLT‐ECG‐ROX complexes were prepared in high yield (>96%). The binding affinity value (Kd) of Tc‐99m GRFLT‐ECG‐ROX for LNCaP cells was estimated to be 9.5 ± 1.3 nM. In gamma camera imaging, the tumor to normal muscle uptake ratios of Tc‐99m GRFLT‐ECG‐ROX increased with time (3.1 ± 0.2, 4.0 ± 0.4, and 6.3 ± 0.9 at 1, 2, and 3 h, respectively). Under real‐time optical imaging, the removal of visible nodules was successfully performed. Thus, Tc‐99m GRFLT‐ECG‐ROX could provide both preoperative molecular imaging and fluorescence imaging guidance for tumor removal. [ABSTRACT FROM AUTHOR]

Published
2021
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141. A Correlation between Iodoplumbate and Photovoltaic Performance of Perovskite Solar Cells Observed by Precursor Solution Aging.

Author

Shin, Gwang Su, Kim, Seul‐Gi, Zhang, Yong, and Park, Nam‐Gyu

Subjects
*SOLAR cells, *SILICON solar cells, *PEROVSKITE
Abstract

This study reports the aging effect of a perovskite precursor solution on the photovoltaic performance of perovskite solar cells. The precursor solution is aged at different temperatures of 4, 25 (room temperature), and 65 °C. Power conversion efficiency (PCE) is found to depend on the aging condition. Average PCE increases with aging time, where optimal aging time for best the PCE decreases with aging temperature. Average PCE of 17.29% obtained from a 24 h aged solution at 4 °C is higher than that of 16.48% from a nonaged fresh solution. At 25 °C, a 2–4 h aged solution yields highest PCE of 17.41%. The aging effect is more accelerated at 65 °C, where the best PCE of around 17.10% is achieved from the solution aged for 1.5–2 h. It is commonly observed that photocurrent density is substantially influenced by aging time, while voltage is less affected. Fill factor declines with aging time regardless of aging temperature. Iodoplumbate PbI2S4 (S = solvent) formed in the precursor solution increases its concentration, as aging time increases at a given temperature, which is beneficial for improving photovoltaic performance. No aging effect is found for excess MAI or PbI2 due to initially formed sufficient iodoplumbate. [ABSTRACT FROM AUTHOR]

Published
2020
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142. Development of fabrics by digital light processing three-dimensional printing technology and using a polyurethane acrylate photopolymer.

Author

Kim, Seul Gi, Song, Ji Eun, and Kim, Hye Rim

Subjects
THREE-dimensional printing, PRINT materials, TECHNOLOGY, TENSILE strength, POLYURETHANES, TEXTILE technology, ACRYLATES
Abstract

This study aimed to produce fabrics by the digital light processing (DLP) three-dimensional (3D) printing technology and using a polyurethane acrylate photopolymer as the printing material. The effect of the acrylate oligomer concentration on printing was evaluated. The DLP 3D printing conditions, such as the curing time and layer thickness, were controlled considering the physical properties, such as the tensile strength, elongation, and crease recovery of the 3D printed material. The optimal printing conditions were as follows: concentration of acrylate oligomer in the photopolymer: 10% (v/v); curing time per layer: 14 s; and layer thickness: 100 µm. These results are expected to guide further studies on the development of fabrics using DLP 3D printing technology. [ABSTRACT FROM AUTHOR]

Published
2020
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