• Journal of the Korean Society of Visualization
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• v.21 no.3
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• pp.7-14
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• 2023

In this study, we investigated the freezing delay time on surfaces with different patterns under -30° conditions through visualization experiments. Among various pattern structures, we fabricated the shape and surface of liquid from the spacing using circular filaments and hole structures. Additionally, using a high-speed camera, we visualized the freezing scenes, enabling us to obtain freezing images and measure the freezing time of the liquid. For each structure, the contact angle and solid fraction of the surface varied. We observed that the freezing delay time was longest when the contact angle was largest and the solid fraction was smallest within the experimental results. We analyzed the variation in anti-icing time using the heat exchange equation between the patterned surface and the liquid.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09b
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• pp.949-950
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• 2005

• Journal of Korean Philosophical Society
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• v.139
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• pp.191-211
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• 2016

This study evaluates the flow of Taoism in the change of knowledge that accompany the passage of time beyond school-centered studies. In particular, it is to understand the Tao(道) and T'ien(天) of "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$" in the thought of T'ien at the time. The thought of T'ien at that time was based on the T'ien in "Mencius". There are two meanings of T'ien in "Mencius", and also of T'ien in "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$". This study examins that idea that the T'ien in "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$" were influenced by the thought of T'ien in "Mencius". It also reveals the T'ien theory of Wang Ch'ung(王充) which is influenced by Taoism. Also, in the course of examining the relation of T'ien theory of Wang Ch'ung with T'ien theories of "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$", it is more embodied that T'ien theories of "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$" were affected by the previous T'ien theories. Furthermore, the meanings of Tao in "Lao $Tz{\check{u}}$" and "Chuang $Tz{\check{u}}$" are revealed.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09b
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• pp.908-909
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• 2005

• Bulletin of the Korean Chemical Society
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• v.33 no.11
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• pp.3827-3830
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• 2012

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.308-309
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• 2008

• Journal of Microbiology and Biotechnology
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• v.29 no.5
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• pp.731-738
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• 2019

Endophytic fungi are an important component of plant microbiota, and have the excellent capacity for producing a broad variety of bioactive metabolites. These bioactive metabolites not only affect the survival of the host plant, but also provide valuable lead compounds for novel drug discovery. In this study, forty-two endophytic filamentous fungi were isolated from Ficus elastica leaves, and further identified as seven individual taxa by ITS-rDNA sequencing. The antimicrobial activity of these endophytic fungi was evaluated against five pathogenic microorganisms. Two strains, Fes1711 (Penicillium funiculosum) and Fes1712 (Trichoderma harzianum), displayed broad-spectrum bioactivities. Our following study emphasizes the isolation, identification and bioactivity testing of chemical metabolites produced by T. harzianum Fes1712. Two new isocoumarin derivatives (1 and 2), together with three known compounds (3-5) were isolated, and their structures were elucidated using NMR and MS. Compounds 1 and 2 exhibited inhibitory activity against Escherichia coli. Our findings reveal that endophytic fungi from the rubber tree F. elastica leaves exhibit unique characteristics and are potential producers of novel natural bioactive products.

• Korean Journal of Radiology
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• v.25 no.10
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• pp.913-923
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• 2024

Objective: To prospectively compare single-shot (SS) echo-planar imaging (EPI) and field-of-view optimized and constrained undistorted single-shot multiplexed sensitivity-encoding (FOCUS MUSE) for diffusion-weighted imaging (DWI) in evaluating thyroid-associated ophthalmopathy (TAO). Materials and Methods: SS EPI and FOCUS MUSE DWIs were obtained from 39 patients with TAO (18 male; mean ± standard deviation: 48.3 ± 13.3 years) and 26 healthy controls (9 male; mean ± standard deviation: 43.0 ± 18.5 years). Two radiologists scored the visual image quality using a 4-point Likert scale. The image quality score, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and apparent diffusion coefficient (ADC) of extraocular muscles (EOMs) were compared between the two DWIs. Differences in the ADC of EOMs were also evaluated. The performance of discriminating active from inactive TAO was assessed using receiver operating characteristic curves. The correlation between ADC and clinical activity score (CAS) was analyzed using Spearman correlation. Results: Compared with SS EPI DWI, FOCUS MUSE DWI demonstrated significantly higher image quality scores (P < 0.001), a higher SNR and CNR on the lateral rectus muscle (LRM) and medial rectus muscle (MRM) (P < 0.05), and a non-significant difference in the ADC of the LRM and MRM. Active TAO showed higher ADC than inactive TAO and healthy controls with both SS EPI and FOCUS MUSE DWIs (P < 0.001). Inactive TAO and healthy controls did not show a significant ADC difference with both DWIs. Compared with SS EPI DWI, FOCUS MUSE DWI demonstrated better discrimination of active from inactive TAO (AUC: 0.925 vs. 0.779; P = 0.007). The ADC was significantly correlated with CAS in SS EPI DWI (r = 0.391, P < 0.001) and FOCUS MUSE DWI (r = 0.645, P < 0.001). Conclusion: FOCUS MUSE DWI provides better images for evaluating EOMs and better performance in diagnosing active TAO than SS EPI DWI. The application of FOCUS MUSE will facilitate the DWI evaluation of TAO.

• Kyungpook Mathematical Journal
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• v.43 no.4
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• pp.593-604
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• 2003

In this paper we introduce the integral type Lupas-$B{\acute{e}}zier$ operator $\tilde{B}_{n,{\alpha}}$, which is a new approximation operator of probabilistic type. We study the rate of pointwise convergence of the operators $\tilde{B}_{n,{\alpha}}$ for local bounded functions and get an asymptotically estimate by means of some methods and techniques of probability theory.

• Bulletin of the Korean Chemical Society
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• v.34 no.7
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• pp.2191-2194
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• 2013