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( Youjin Yoon ),( Hoonhee Seo ),( Sukyung Kim ),( Youngkyoung Lee ),( Md Abdur Rahim ),( Saebim Lee ),( Ho-yeon Song ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.12
Tuberculosis is a highly contagious disease caused by Mycobacterium tuberculosis. It affects about 10 million people each year and is still one of the leading causes of death worldwide. About 2 to 3 billion people (equivalent to 1 in 3 people in the world) are infected with latent tuberculosis. Moreover, as the number of multidrug-resistant, extensively drug-resistant, and totally drug-resistant strains of M. tuberculosis continues to increase, there is an urgent need to develop new anti-tuberculosis drugs that are different from existing drugs to combat antibiotic-resistant M. tuberculosis. Against this background, we aimed to develop new anti-tuberculosis drugs using probiotics. Here, we report the anti-tuberculosis effect of Pediococcus acidilactici PMC202 isolated from young radish kimchi, a traditional Korean fermented food. Under coculture conditions, PMC202 inhibited the growth of M. tuberculosis. In addition, PMC202 inhibited the growth of drug-sensitive and -resistant M. tuberculosis- infected macrophages at a concentration that did not show cytotoxicity and showed a synergistic effect with isoniazid. In a 2-week, repeated oral administration toxicity study using mice, PMC202 did not cause weight change or specific clinical symptoms. Furthermore, the results of 16S rRNA-based metagenomics analysis confirmed that dysbiosis was not induced in bronchoalveolar lavage fluid after oral administration of PMC202. The anti-tuberculosis effect of PMC202 was found to be related to the reduction of nitric oxide. Our findings indicate that PMC202 could be used as an anti-tuberculosis drug candidate with the potential to replace current chemical-based drugs. However, more extensive toxicity, mechanism of action, and animal efficacy studies with clinical trials are needed.
Yoon Kyung Cho,Chin Su Koh,Youjin Lee,Minkyung Park,Tae Jun Kim,Hyun Ho Jung,Jin Woo Chang,Sang Beom Jun 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.1
Brain–machine interface (BMI) provides an alternative route for controlling an external device with one’s intention. For individuals with motor-related disability, the BMI technologies can be used to replace or restore motor functions. Therefore, BMIs for movement restoration generally decode the neural activity from the motor-related brain regions. In this study, however, we designed a BMI system that uses sensory-related neural signals for BMI combined with electrical stimulation for reward. Four-channel electrocorticographic (ECoG) signals were recorded from the whisker-related somatosensory cortex of rats and converted to extract the BMI signals to control the one-dimensional movement of a dot on the screen. At the same time, we used operant conditioning with electrical stimulation on medial forebrain bundle (MFB), which provides a virtual reward to motivate the rat to move the dot towards the desired center region. The BMI task training was performed for 7 days with ECoG recording and MFB stimulation. Animals successfully learned to move the dot location to the desired position using S1BF neural activity. This study successfully demonstrated that it is feasible to utilize the neural signals from the whisker somatosensory cortex for BMI system. In addition, the MFB electrical stimulation is effective for rats to learn the behavioral task for BMI.
Meta-Blocks : Customizable VR Controller with Multi-input Kinesthetic Haptic Feedback
Youjin Sung(성유진),Kyungeun Jung(정경은),Yoonjae Hong(홍윤재),Hyunho Na(나현호),Eunji Oh(오은지),Sang Ho Yoon(윤상호) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2
This paper presents Meta-Blocks, a customizable VR controller which provides kinesthetic haptic feedback. By applying the repulsive force of electromagnets and permanent magnets to the module-typed controller, it gives users an immersive experience in a VR environment. Also, by diversifying the size of the holder, a wide range of ages of users can play with it. We confirmed the result by conducting quantitative and qualitative evaluations. This paper contributes in the sense of utilizing magnetic force which is cost-efficient, and opening for various users with different hand sizes.
A Survey of Physics-Informed Neural Networks in Vision Generation
Youjin Kim(김유진),DaGyeong Na(나다경),Hongchan Yoon(윤홍찬),JunSeok Kwon(권준석) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
The field of computer vision has seen remarkable advancements in the domain of generative tasks. These advancements have facilitated the creation of diverse images from complex input data. However, traditional data-driven generative models often fall short in terms of robustness and interpretability, particularly when faced with the challenges of high-dimensional image data and noisy or insufficient training datasets. These limitations are especially problematic in tasks requiring the simulation of physical phenomena, as these models typically generate outputs that may not be physically plausible. Physics-Informed Neural Networks (PINNs) have emerged as a potent solution to these deficiencies, integrating physical laws directly into the learning process to enhance both the accuracy and generalizability of model predictions. This paper explores the application of PINNs in various computer vision generation tasks, highlighting their utility in generating visually plausible content that adheres to realistic physical constraints. This review explores how incorporating physical laws into GANs and DDPMs, as illustrated in various research studies, addresses the shortcomings of traditional generative models, facilitating more dependable and physically accurate visual simulations across a range of applications. The merging of physics and machine learning in these instances not only stabilizes the training processes but also enhances the fidelity and robustness of generated images. Such insights underscore the broad potential of physics-informed methodologies in advancing computational vision systems, showing that these approaches are instrumental in refining the capabilities of generative models.
Lee, Youjin,Yoon, Byung-Ho,Lee, Seeyoun,Chung, Youn Kyung,Lee, Young-Kyun The Korean Society for Bone and Mineral Research 2019 대한골대사학회지 Vol.26 No.1
<P><B>Background</B></P><P>The effects of subclinical hyperthyroidism on fracture risk induced by thyroid-stimulating hormone (TSH) suppression therapy in patients with thyroid cancer still remains controversial. We performed a meta-analysis and systematic review to evaluate the effects of TSH suppression therapy on osteoporotic fracture in patients with thyroid cancer.</P><P><B>Methods</B></P><P>We performed a systematic search to identify studies which included osteoporotic fractures (hip fracture and vertebral fracture) in patients on TSH suppression therapy for thyroid cancer. Main outcome measures were occurrence and risk of osteoporotic fractures including hip and vertebral fractures between patients and controls.</P><P><B>Results</B></P><P>A systematic search yielded a total of 8 studies appropriate for review which included osteoporotic fracture outcome in patients on TSH suppression therapy for thyroid cancer. Studies with larger number of subjects showed the higher risk of osteoporotic fracture in group with TSH suppression therapy, although studies with smaller sample size presented a similar risk of fracture with control group.</P><P><B>Conclusions</B></P><P>Although studies were limited by small numbers, results suggested possible association between chronic TSH suppression therapy and the increased risk of osteoporotic fractures in patients with thyroid cancer.</P>
Eunkyoung Oh,Youjin Kim,Soo-yeon Park,Yeni Lim,Ji-yoon Shin,Ji Yeon Kim,Ji-Hyun Kim,Moo-Yong Rhee,Oran Kwon 한국영양학회 2020 Nutrition Research and Practice Vol.14 No.4
BACKGROUND/OBJECTIVES: Arterial stiffness and endothelial dysfunction are 2 of the independent predictors for cardiovascular disease, while Acanthopanax senticosus Harms (ASH) is a traditional medicinal plant that can improve cardiovascular health. This study aimed to investigate the efficacy of the fruit of ASH on vascular function in apparently healthy subjects. SUBJECTS/METHODS: A 12-week, randomized, double-blind, placebo-controlled design, consisting of healthy adults with at least 2 of the following 3 conditions: borderline high blood pressure (BP; 120 mmHg ≤ systolic BP ≤ 160 mmHg or 80 mmHg ≤ diastolic BP ≤ 100 mmHg), smoking (≥10 cigarettes/day), and borderline blood lipid levels (220 ≤ total cholesterol ≤ 240, 130 ≤ low density lipoprotein cholesterol ≤ 165, or 150 ≤ triglyceride ≤ 220 mg/dL). Randomly assigned 76 subjects who received a placebo or 2 doses of ASH fruit (low, 500 mg/day; high, 1,000 mg/day) completed the intervention. Brachial-ankle pulse wave velocity (baPWV), flow-mediated dilation, carotid intima-media thickness, and BP were measured both at baseline and following the 12-week intervention. Endothelial nitric oxide synthase (eNOS) phosphorylation was assessed by western blotting. RESULTS: Compared with the placebo group, the low-dose group showed more significant changes after the 12-week intervention period in terms of systolic BP (0.1 vs. −7.7 mmHg; P = 0.044), baPWV (31.3 vs. −98.7 cm/s; P = 0.007), and the ratio of phospho-eNOS/eNOS (0.8 vs. 1.22; P = 0.037). CONCLUSIONS: These results suggest that ASH fruit extract at 500 mg/day has the potential to improve BP and arterial stiffness via endothelial eNOS activation in healthy adults with smoking and the tendency of having elevated BP or blood lipid parameters.
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정혜윤 ( Hye Yoon Chung ),한유진 ( Youjin Hahn ) 한국보건경제정책학회 2021 보건경제와 정책연구 Vol.27 No.2
This study examines the expenditures and institutional care utilization under the national Long-term Care (LTC) insurance program in Korea. Using Anderson’s behavior model, we estimate a fixed-effects regression model on nationally representative longitudinal cohort data on elderly people. Compared to the LTC insurance recipients who receive informal care from family, the recipients who do not have a primary caregiver or receive help from a formal caregiver/volunteer spend larger amounts of LTC expenditures. The recipients who do not co-reside with their family, are on a low income, and are highly dependent on others due to their low functional and cognitive capacity are also more likely to incur high LTC spending. In terms of institutional care, the elderly who do not receive informal care from family, who do not live with their family or have high physical dependency tend to be heavier users of the institutional care than home care. According to this study, household structures and informal care provided by family members play a crucial role in explaining LTC expenditures and institutional care utilization among the recipients.