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Kim JH, Kwak W, Nam Y, Baek J, Lee Y, Yoon S, Kim W. Effect of postbiotic Lactiplantibacillus plantarum LRCC5314 supplemented in powdered milk on type 2 diabetes in mice. J Dairy Sci 2024:S0022-0302(24)00627-1. [PMID: 38554828 DOI: 10.3168/jds.2023-24103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 02/20/2024] [Indexed: 04/02/2024]
Abstract
Type 2 diabetes (T2D) is a chronic multifactorial disease characterized by a combination of insulin resistance and impaired glucose regulation. The alleviative effects of probiotics on T2D have been widely studied. However, studies on the effects of postbiotics, known as inactivated probiotics, on dairy products are limited. This study aimed to evaluate the effectiveness of postbiotic Lactiplantibacillus plantarum LRCC5314 in milk powder (MP-LRCC5314) in a stress-T2D mouse model. Compared with probiotic MP-LRCC5314, postbiotic MP-LRCC5314 significantly influenced stress-T2D-related factors. The administration of heat-killed MP-LRCC5314 reduced corticosterone levels, increased short-chain fatty acid production by modulating gut microbiota, and regulated immune response, glucose metabolism, stress-T2D-related biomarkers in the brain, gut, and adipose tissues, as well as glucose and insulin sensitivity. Additionally, heat-killed MP-LRCC5314 treatment led to a decrease in pro-inflammatory cytokine levels and an increase in anti-inflammatory cytokine levels. Overall, these findings suggest that adding postbiotic MP-LRCC5314 to milk powder could serve as a potential supplement for stress-T2D mitigation.
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Affiliation(s)
- J-H Kim
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea; LuxBiome Co. Ltd., Seoul 06974, Republic of Korea
| | - W Kwak
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea; Lotte R&D Center, Seoul 07594, Republic of Korea
| | - Y Nam
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea
| | - J Baek
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea
| | - Y Lee
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea
| | - S Yoon
- Lotte R&D Center, Seoul 07594, Republic of Korea
| | - W Kim
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea; LuxBiome Co. Ltd., Seoul 06974, Republic of Korea.
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Cho K, Kim KD, Jeong J, Nam Y, Kim J, Choi C, Lee S, Hong GS, Seo JB, Kim N. Approximating Intermediate Feature Maps of Self-Supervised Convolution Neural Network to Learn Hard Positive Representations in Chest Radiography. J Imaging Inform Med 2024:10.1007/s10278-024-01032-x. [PMID: 38381382 DOI: 10.1007/s10278-024-01032-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 01/22/2024] [Accepted: 01/24/2024] [Indexed: 02/22/2024]
Abstract
Recent advances in contrastive learning have significantly improved the performance of deep learning models. In contrastive learning of medical images, dealing with positive representation is sometimes difficult because some strong augmentation techniques can disrupt contrastive learning owing to the subtle differences between other standardized CXRs compared to augmented positive pairs; therefore, additional efforts are required. In this study, we propose intermediate feature approximation (IFA) loss, which improves the performance of contrastive convolutional neural networks by focusing more on positive representations of CXRs without additional augmentations. The IFA loss encourages the feature maps of a query image and its positive pair to resemble each other by maximizing the cosine similarity between the intermediate feature outputs of the original data and the positive pairs. Therefore, we used the InfoNCE loss, which is commonly used loss to address negative representations, and the IFA loss, which addresses positive representations, together to improve the contrastive network. We evaluated the performance of the network using various downstream tasks, including classification, object detection, and a generative adversarial network (GAN) inversion task. The downstream task results demonstrated that IFA loss can improve the performance of effectively overcoming data imbalance and data scarcity; furthermore, it can serve as a perceptual loss encoder for GAN inversion. In addition, we have made our model publicly available to facilitate access and encourage further research and collaboration in the field.
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Affiliation(s)
- Kyungjin Cho
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Ki Duk Kim
- Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Jiheon Jeong
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Yujin Nam
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Jeeyoung Kim
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Changyong Choi
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Soyoung Lee
- Department of Bioengineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea
| | - Gil-Sun Hong
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Joon Beom Seo
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Namkug Kim
- Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-Ro 43-Gil Songpa-Gu, Seoul, 05505, South Korea.
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Ahn Y, Lee SM, Nam Y, Lee H, Choe J, Do KH, Seo JB. Deep Learning-Based CT Reconstruction Kernel Conversion in the Quantification of Interstitial Lung Disease: Effect on Reproducibility. Acad Radiol 2024; 31:693-705. [PMID: 37516583 DOI: 10.1016/j.acra.2023.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/11/2023] [Accepted: 06/12/2023] [Indexed: 07/31/2023]
Abstract
RATIONALE AND OBJECTIVES The effect of different computed tomography (CT) reconstruction kernels on the quantification of interstitial lung disease (ILD) has not been clearly demonstrated. The study aimed to investigate the effect of reconstruction kernels on the quantification of ILD on CT and determine whether deep learning-based kernel conversion can reduce the variability of automated quantification results between different CT kernels. MATERIALS AND METHODS Patients with ILD or interstitial lung abnormality who underwent noncontrast high-resolution CT between June 2022 and September 2022 were retrospectively included. Images were reconstructed with three different kernels: B30f, B50f, and B60f. B60f was regarded as the reference standard for quantification, and B30f and B50f images were converted to B60f images using a deep learning-based algorithm. Each disease pattern of ILD and the fibrotic score were quantified using commercial software. The effect of kernel conversion on measurement variability was estimated using intraclass correlation coefficient (ICC) and Bland-Altman method. RESULTS A total of 194 patients were included in the study. Application of different kernels induced differences in the quantified extent of each pattern. Reticular opacity and honeycombing were underestimated on B30f images and overestimated on B50f images. After kernel conversion, measurement variability was reduced (mean difference, from -2.0 to 3.9 to -0.3 to 0.4%, and 95% limits of agreement [LOA], from [-5.0, 12.7] to [-2.7, 2.1]). The fibrotic score for converted B60f from B50f images was almost equivalent to the original B60f (ICC, 1.000; mean difference, 0.0; and 95% LOA [-0.4, 0.4]). CONCLUSION Quantitative CT analysis of ILD was affected by the application of different kernels, but deep learning-based kernel conversion effectively reduced measurement variability, improving the reproducibility of quantification.
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Affiliation(s)
- Yura Ahn
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea (Y.A., S.M.L., J.C., K.-H.D., J.B.S.)
| | - Sang Min Lee
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea (Y.A., S.M.L., J.C., K.-H.D., J.B.S.).
| | - Yujin Nam
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea (Y.N.)
| | - Hyunna Lee
- Bigdata Research Center, Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea (H.L.)
| | - Jooae Choe
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea (Y.A., S.M.L., J.C., K.-H.D., J.B.S.)
| | - Kyung-Hyun Do
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea (Y.A., S.M.L., J.C., K.-H.D., J.B.S.)
| | - Joon Beom Seo
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea (Y.A., S.M.L., J.C., K.-H.D., J.B.S.)
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Cho K, Kim KD, Nam Y, Jeong J, Kim J, Choi C, Lee S, Lee JS, Woo S, Hong GS, Seo JB, Kim N. CheSS: Chest X-Ray Pre-trained Model via Self-supervised Contrastive Learning. J Digit Imaging 2023; 36:902-910. [PMID: 36702988 PMCID: PMC10287612 DOI: 10.1007/s10278-023-00782-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/12/2023] [Accepted: 01/16/2023] [Indexed: 01/27/2023] Open
Abstract
Training deep learning models on medical images heavily depends on experts' expensive and laborious manual labels. In addition, these images, labels, and even models themselves are not widely publicly accessible and suffer from various kinds of bias and imbalances. In this paper, chest X-ray pre-trained model via self-supervised contrastive learning (CheSS) was proposed to learn models with various representations in chest radiographs (CXRs). Our contribution is a publicly accessible pretrained model trained with a 4.8-M CXR dataset using self-supervised learning with a contrastive learning and its validation with various kinds of downstream tasks including classification on the 6-class diseases in internal dataset, diseases classification in CheXpert, bone suppression, and nodule generation. When compared to a scratch model, on the 6-class classification test dataset, we achieved 28.5% increase in accuracy. On the CheXpert dataset, we achieved 1.3% increase in mean area under the receiver operating characteristic curve on the full dataset and 11.4% increase only using 1% data in stress test manner. On bone suppression with perceptual loss, we achieved improvement in peak signal to noise ratio from 34.99 to 37.77, structural similarity index measure from 0.976 to 0.977, and root-square-mean error from 4.410 to 3.301 when compared to ImageNet pretrained model. Finally, on nodule generation, we achieved improvement in Fréchet inception distance from 24.06 to 17.07. Our study showed the decent transferability of CheSS weights. CheSS weights can help researchers overcome data imbalance, data shortage, and inaccessibility of medical image datasets. CheSS weight is available at https://github.com/mi2rl/CheSS .
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Affiliation(s)
- Kyungjin Cho
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Ki Duk Kim
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Yujin Nam
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Jiheon Jeong
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Jeeyoung Kim
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Changyong Choi
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Soyoung Lee
- Department of Biomedical Engineering, Asan Medical Center, College of Medicine, Asan Medical Institute of Convergence Science and Technology, University of Ulsan, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Jun Soo Lee
- Department of Industrial Engineering, Seoul National University, Seoul, Republic of Korea
| | - Seoyeon Woo
- Department of Biomedical Engineering, University of Waterloo, Waterloo, ON, Canada
| | - Gil-Sun Hong
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Joon Beom Seo
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Namkug Kim
- Department of Convergence Medicine, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, 5F, 26, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea.
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Jeong J, Kim KD, Nam Y, Cho CE, Go H, Kim N. Stain normalization using score-based diffusion model through stain separation and overlapped moving window patch strategies. Comput Biol Med 2023; 152:106335. [PMID: 36473344 DOI: 10.1016/j.compbiomed.2022.106335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/10/2022] [Accepted: 11/15/2022] [Indexed: 11/30/2022]
Abstract
Hematoxylin and eosin (H&E) staining is the gold standard modality for diagnosis in medicine. However, the dosage ratio of hematoxylin to eosin in H&E staining has not been standardized yet. Additionally, H&E stains fade out at various speeds. Therefore, the staining quality could differ among each image, and stain normalization is a critical preprocessing approach for training deep learning (DL) models, especially in long-term and/or multicenter digital pathology studies. However, conventional methods for stain normalization have some significant drawbacks, such as collapsing in the structure and/or texture of tissue. In addition, conventional methods must require a reference patch or slide. Meanwhile, DL-based methods have a risk of overfitting and/or grid artifacts. We developed a score-based diffusion model of colorization for stain normalization. However, mistransfer, in which the model confuses hematoxylin with eosin, can occur using a score-based diffusion model due to its high diversity nature. To overcome this mistransfer, we propose a stain separation method using sparse non-negative matrix factorization (SNMF), which can decompose pathology slide into Hematoxylin and Eosin to normalize each stain component. Furthermore, inpainting with overlapped moving window patches was used to prevent grid artifacts of whole slide image normalization. Our method can normalize the whole slide pathology images through this stain normalization pipeline with decent performance.
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Affiliation(s)
- Jiheon Jeong
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea; Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
| | - Ki Duk Kim
- Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
| | - Yujin Nam
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea; Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea
| | - Cristina Eunbee Cho
- Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea
| | - Heounjeong Go
- Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
| | - Namkug Kim
- Department of Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Dawkins J, Donelson F, Bossa D, Zhang C, Sathe A, Owen D, Nam Y. P-530 tRNA fragments in follicle fluid can be explored in Diminished Ovarian Reserve patients as a marker of IVF outcomes. Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Study question
Can tRNA fragments in follicle fluid be explored for markers that predict blastocyst formation in patients with diminished ovarian reserve?
Summary answer
tRNA-Ser-CGA-4 is up-regulated in the follicle fluid of patients with diminished ovarian reserve (DOR)
What is known already
tRNA fragments are a novel class of small non-coding RNAs that have been shown to play regulatory roles in reproductive biology.
Study design, size, duration
Non-Randomized case control study in patients presenting for IVF treatment at a University affiliated fertility clinic from September 2020- January 2021. Thirty three patients were included: 15 patients with DOR and 18 controls.
Participants/materials, setting, methods
Patients were stimulated by appropriate protocols according to their age, diagnosis and AMH.
At retrieval, non-bloody follicle fluid (FF) was retrieved for after removing the cumulus-oophorus complex. FF was centrifuged at 1600 g x 10 mins and filtered with 80 nm filter for analysis.
Main results and the role of chance
There were no differences between the two groups with respect to age, BMI and duration of infertility. The mean age was 35.1 years
As anticipated, the mean AMH, antral follicle count and number of eggs retrieved were statistically lower in the DOR groups compared with controls (<0.05)
The fertilization rate was 61.2% in DOR vs 79.5% in controls
The blastocyst rate was 39.5% in DOR patients and 50.6% in controls
Total RNA yield was lower in DOR patients, as 50% of the DOR samples had undetectable levels (p < 0.001).
Samples were predominantly processed in duplicate. Input into the pipeline was paired end data which showed an overall tRNA fragment count that was higher in the DOR population. Log2FC showed an up-regulation of the tRNA fragments tRNA-Ser-CGA-4, tRNA-Cys-GCA-15, tRNA-Cys-GCA-10 and tRNA-Cys-GCA-19 in the DOR population.
Limitations, reasons for caution
Undetectable levels in follicle fluid of some of the DOR patients introduced selection bias
Larger sample size and broader applicability across various ethnic groups.
Wider implications of the findings
Follicle fluid can be explored to give insight into the signaling pathways of ovarian biology
Non-invasive method of assessing oocyte competence
Useful in explaining the pathophysiology of DOR
Can these findings assist is in the identification of therapeutic targets to delay the progression of age related/non-age related DOR?
Trial registration number
not applicable
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Affiliation(s)
- J Dawkins
- University of Pennsylvania, Obstetrics and Gynecology- Division of Reproductive Endocrinology and Infertility , Philadelphia, U.S.A
| | - F Donelson
- Syracuse University, Biomedical and Chemical Engineering , Syracuse, U.S.A
| | - D Bossa
- Parkland Health and Hospital System, Obstetrics and Gynecology , Dallas, U.S.A
| | - C Zhang
- University of Texas Southwestern, Department of Biochemistry , Dallas, U.S.A
| | - A Sathe
- University of Texas Southwestern, McDermott Center- Bioinformatics Core , Dallas, U.S.A
| | - D Owen
- University of Texas Southwestern, Obstetrics and Gynecology , Dallas, U.S.A
| | - Y Nam
- University of Texas Southwestern, Department of Biochemistry , Dallas, U.S.A
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Kim S, Seo J, Nam Y, Lee K, Song S, Song J. M188 Evaluation of the ischemia modified albumin assay on the Atellica IM analyzer. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Nam Y, Park S, Jeong S, Yum Y, Kim M, Park H, Lim J, Choi B, Jung S. Mesenchymal Stem/Stromal Cells: THERAPEUTIC POTENTIAL FOR PERIPHERAL NERVE REGENERATION OF SCHWANN CELL-LIKE CELLS DIFFERENTIATED FROM TONSIL- DERIVED MESENCHYMAL STEM CELLS IN C22 MICE. Cytotherapy 2022. [DOI: 10.1016/s1465-3249(22)00173-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kim S, Cho S, Cho K, Seo J, Nam Y, Park J, Kim K, Kim D, Hwang J, Yun J, Jang M, Lee H, Kim N. An Open Medical Platform to Share Source Code and Various Pre-Trained Weights for Models to Use in Deep Learning Research. Korean J Radiol 2021; 22:2073-2081. [PMID: 34719891 PMCID: PMC8628158 DOI: 10.3348/kjr.2021.0170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 07/26/2021] [Accepted: 08/01/2021] [Indexed: 11/21/2022] Open
Abstract
Deep learning-based applications have great potential to enhance the quality of medical services. The power of deep learning depends on open databases and innovation. Radiologists can act as important mediators between deep learning and medicine by simultaneously playing pioneering and gatekeeping roles. The application of deep learning technology in medicine is sometimes restricted by ethical or legal issues, including patient privacy and confidentiality, data ownership, and limitations in patient agreement. In this paper, we present an open platform, MI2RLNet, for sharing source code and various pre-trained weights for models to use in downstream tasks, including education, application, and transfer learning, to encourage deep learning research in radiology. In addition, we describe how to use this open platform in the GitHub environment. Our source code and models may contribute to further deep learning research in radiology, which may facilitate applications in medicine and healthcare, especially in medical imaging, in the near future. All code is available at https://github.com/mi2rl/MI2RLNet.
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Affiliation(s)
- Sungchul Kim
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sungman Cho
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Kyungjin Cho
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jiyeon Seo
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Yujin Nam
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jooyoung Park
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Kyuri Kim
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Daeun Kim
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Jeongeun Hwang
- Department of Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jihye Yun
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Miso Jang
- Department of Biomedical Engineering, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.,Department of Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Hyunna Lee
- Bigdata Research Center, Asan Institute for Life Science, Asan Medical Center, Seoul, Korea
| | - Namkug Kim
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.,Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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Nam Y, Yeon GM, Kong SG. RUNX1 Germline Mutation in a Patient with Chronic Thrombocytopenia. Clin Pediatr Hematol Oncol 2021. [DOI: 10.15264/cpho.2021.28.2.89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Yujin Nam
- Department of Pediatrics, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
| | - Gyu Min Yeon
- Department of Pediatrics, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
| | - Seom Gim Kong
- Department of Pediatrics, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
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Song Y, Lim J, Lim T, Im K, Kim N, Nam Y, Jeon Y, Ko H, Park I, Shin J, Cho S. Human mesenchymal stem cells derived from umbilical cord and bone marrow exert immunomodulatory effects in different mechanisms. Cytotherapy 2021. [DOI: 10.1016/s1465324921003455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bae YJ, Song YS, Kim JM, Choi BS, Nam Y, Choi JH, Lee WW, Kim JH. Determining the Degree of Dopaminergic Denervation Based on the Loss of Nigral Hyperintensity on SMWI in Parkinsonism. AJNR Am J Neuroradiol 2021; 42:681-687. [PMID: 33509919 DOI: 10.3174/ajnr.a6960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 10/21/2021] [Indexed: 01/23/2023]
Abstract
BACKGROUND AND PURPOSE Nigrostriatal dopaminergic function in patients with Parkinson disease can be assessed using 123I-2β-carbomethoxy-3β-(4-iodophenyl)-N-(3-fluoropropyl)-nortropan dopamine transporter (123I-FP-CIT) SPECT, and a good correlation has been demonstrated between nigral status on SWI and dopaminergic denervation on 123I-FP-CIT SPECT. Here, we aim to correlate quantified dopamine transporter attenuation on 123I-FP-CIT SPECT with nigrosome-1 status using susceptibility map-weighted imaging (SMWI). MATERIALS AND METHODS Between May 2017 and January 2018, consecutive patients with idiopathic Parkinson disease (n = 109) and control participants (n = 29) who underwent 123I-FP-CIT SPECT with concurrent 3T SWI were included. SMWI was generated from SWI. Two neuroradiologists evaluated nigral hyperintensity from nigrosome-1 on each side of the substantia nigra. Using consensus reading, we compared the 123I-FP-CIT-specific binding ratio according to nigral hyperintensity status and the 123I-FP-CIT specific binding ratio threshold to confirm the loss of nigral hyperintensity was determined using receiver operating characteristic curve analysis. RESULTS The concordance rate between SMWI and 123I-FP-CIT SPECT was 65.9%. The 123I-FP-CIT-specific binding ratios in the striatum, caudate nucleus, and putamen were significantly lower when nigral hyperintensity in the ipsilateral substantia nigra was absent than when present (all, P < .001). The 123I-FP-CIT-specific binding ratio threshold values for the determination of nigral hyperintensity loss were 2.56 in the striatum (area under the curve, 0.890), 3.07 in the caudate nucleus (0.830), and 2.36 in the putamen (0.887). CONCLUSIONS Nigral hyperintensity on SMWI showed high positive predictive value and low negative predictive value with dopaminergic degeneration on 123I-FP-CIT SPECT. In patients with Parkinson disease, the loss of nigral hyperintensity is prominent in patients with lower striatal specific binding ratios.
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Affiliation(s)
- Y J Bae
- From the Department of Radiology (Y.J.B., B.S.C., J.H.K.)
| | - Y S Song
- Nuclear Medicine (Y.S.S., W.W.L.)
| | - J-M Kim
- Neurology (J.-M.K., J.-H.C.), Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - B S Choi
- From the Department of Radiology (Y.J.B., B.S.C., J.H.K.)
| | - Y Nam
- Division of Biomedical Engineering (Y.N.), Hankuk University of Foreign Studies, Gyeonggi-do, Republic of Korea
| | - J-H Choi
- Neurology (J.-M.K., J.-H.C.), Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - W W Lee
- Nuclear Medicine (Y.S.S., W.W.L.)
- Medical Research Center, Institute of Radiation Medicine (W.W.L.), Seoul National University, Seoul, Republic of Korea
| | - J H Kim
- From the Department of Radiology (Y.J.B., B.S.C., J.H.K.)
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Ji W, Nam Y, Kang J, Yeo M, Jung Y, Choi C. P37.13 Diagnostic Performance of Aptamer-Based Multiplex PCR Compared to Luminex Assay for Detection of Non-Small Cell Lung Cancer. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yang J, Kim H, Shin K, Nam Y, Heo HJ, Kim GH, Hwang BY, Kim J, Woo S, Choi HS, Ko DS, Lee D, Kim YH. Molecular insights into the development of hepatic metastases in colorectal cancer: a metastasis prediction study. Eur Rev Med Pharmacol Sci 2020; 24:12701-12708. [PMID: 33378017 DOI: 10.26355/eurrev_202012_24168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Colorectal cancer is presently the third most commonly diagnosed cancer in the United States. In this study, we identified molecular differences between hepatic and non-hepatic metastases in colorectal cancer and evaluated their prognostic significance. MATERIALS AND METHODS We downloaded primary data from the NCBI Gene Expression Omnibus (GSE6988, GSE62321, GSE50760, and GSE28722). To identify the molecular differences, we used the Significance Analysis of Microarray method. We selected nine prognostic genes (SYTL2, PTPLAD1, CDS1, RNF138, PIGR, WDR78, MYO7B, TSPAN3, and ATP5F1) with hepatic metastasis prediction score in colorectal cancer (hereafter referred to as LASSO Score). We confirmed the prognostic significance of the LASSO Score by using Kaplan-Meier survival analysis, multivariate analysis, the time-dependent area under the curve (AUC) of Uno's C-index, and the AUC of the receiver operating characteristic curve at 1-5 years. RESULTS Survival analysis revealed that a high LASSO Score is associated with a poor prognosis in colorectal cancer patients with hepatic metastases (p = 0). Analysis of C-indices and AUC values from the receiver operating characteristic curve further supported this prediction by the LASSO Score. Multivariate analysis confirmed the prognostic significance of the LASSO Score (p = 1.13e-06). CONCLUSIONS This study reveals the biological mechanisms underlying hepatic metastases in colorectal cancer and will help in developing targeted therapies for colorectal cancer.
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Affiliation(s)
- J Yang
- Department of Premedicine, School of Medicine, Pusan National University, Yangsan, South Korea.
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Choi Y, Nam Y, Jang J, Shin NY, Ahn KJ, Kim BS, Lee YS, Kim MS. Prediction of Human Papillomavirus Status and Overall Survival in Patients with Untreated Oropharyngeal Squamous Cell Carcinoma: Development and Validation of CT-Based Radiomics. AJNR Am J Neuroradiol 2020; 41:1897-1904. [PMID: 32943420 DOI: 10.3174/ajnr.a6756] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 07/03/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND PURPOSE Human papillomavirus is a prognostic marker for oropharyngeal squamous cell carcinoma. We aimed to determine the value of CT-based radiomics for predicting the human papillomavirus status and overall survival in patients with oropharyngeal squamous cell carcinoma. MATERIALS AND METHODS Eighty-six patients with oropharyngeal squamous cell carcinoma were retrospectively collected and grouped into training (n = 61) and test (n = 25) sets. For human papillomavirus status and overall survival prediction, radiomics features were selected via a random forest-based algorithm and Cox regression analysis, respectively. Relevant features were used to build multivariate Cox regression models and calculate the radiomics score. Human papillomavirus status and overall survival prediction were assessed via the area under the curve and concordance index, respectively. The models were validated in the test and The Cancer Imaging Archive cohorts (n = 78). RESULTS For prediction of human papillomavirus status, radiomics features yielded areas under the curve of 0.865, 0.747, and 0.834 in the training, test, and validation sets, respectively. In the univariate Cox regression, the human papillomavirus status (positive: hazard ratio, 0.257; 95% CI, 0.09-0.7; P = .008), T-stage (≥III: hazard ratio, 3.66; 95% CI, 1.34-9.99; P = .011), and radiomics score (high-risk: hazard ratio, 3.72; 95% CI, 1.21-11.46; P = .022) were associated with overall survival. The addition of the radiomics score to the clinical Cox model increased the concordance index from 0.702 to 0.733 (P = .01). Validation yielded concordance indices of 0.866 and 0.720. CONCLUSIONS CT-based radiomics may be useful in predicting human papillomavirus status and overall survival in patients with oropharyngeal squamous cell carcinoma.
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Affiliation(s)
- Y Choi
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Y Nam
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Division of Biomedical Engineering (Y.N.), Hankuk University of Foreign Studies, Yongin-Si, Gyeonggi-do, Republic of Korea
| | - J Jang
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - N-Y Shin
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - K-J Ahn
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - B-S Kim
- Department of Radiology (Y.C., Y.N., J.J., N.-Y.S, K.-J.A., B.-S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Y-S Lee
- Department of Hospital Pathology (Y.-S.L.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - M-S Kim
- Department of Otolaryngology-Head and Neck Surgery (M.S.K.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Parker J, Chen H, Lea J, Nam Y. Methyltransferase-like 14 is associated with decreased progression free survival in advanced-stage endometrioid endometrial cancer. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Nam Y, Nam K, Myung NH, Jeon M, Kim J. Gastrointestinal: Lymphoblastic lymphoma presenting as huge abdominal masses. J Gastroenterol Hepatol 2020; 35:917. [PMID: 31694062 DOI: 10.1111/jgh.14906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 10/14/2019] [Indexed: 12/09/2022]
Affiliation(s)
- Y Nam
- Department of Internal Medicine, Dankook University Hospital, Cheonan, South Korea
| | - K Nam
- Department of Internal Medicine, Dankook University Hospital, Cheonan, South Korea
| | - N-H Myung
- Department of Pathology, Dankook University Hospital, Dankook University College of Medicine, Cheonan, South Korea
| | - M Jeon
- Department of Internal Medicine, Dankook University Hospital, Cheonan, South Korea
| | - J Kim
- Department of Internal Medicine, Dankook University Hospital, Cheonan, South Korea
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Kim J, Park S, Nam Y, Jo I, Jung S. Identifications of Molecular Makers for parathyroid hormone-releasing cell differentiation of tonsil-derived mesenchymal stem cells. Cytotherapy 2020. [DOI: 10.1016/j.jcyt.2020.03.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wright K, Beck KM, Debnath S, Amini JM, Nam Y, Grzesiak N, Chen JS, Pisenti NC, Chmielewski M, Collins C, Hudek KM, Mizrahi J, Wong-Campos JD, Allen S, Apisdorf J, Solomon P, Williams M, Ducore AM, Blinov A, Kreikemeier SM, Chaplin V, Keesan M, Monroe C, Kim J. Benchmarking an 11-qubit quantum computer. Nat Commun 2019; 10:5464. [PMID: 31784527 PMCID: PMC6884641 DOI: 10.1038/s41467-019-13534-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 11/13/2019] [Indexed: 11/23/2022] Open
Abstract
The field of quantum computing has grown from concept to demonstration devices over the past 20 years. Universal quantum computing offers efficiency in approaching problems of scientific and commercial interest, such as factoring large numbers, searching databases, simulating intractable models from quantum physics, and optimizing complex cost functions. Here, we present an 11-qubit fully-connected, programmable quantum computer in a trapped ion system composed of 13 171Yb+ ions. We demonstrate average single-qubit gate fidelities of 99.5\documentclass[12pt]{minimal}
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\begin{document}$$\%$$\end{document}%, respectively. These algorithms serve as excellent benchmarks for any type of quantum hardware, and show that our system outperforms all other currently available hardware. The growing complexity of quantum computing devices makes presents challenges for benchmarking their performance as previous, exhaustive approaches become infeasible. Here the authors characterise the quality of their 11-qubit device by successfully computing two quantum algorithms.
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Affiliation(s)
- K Wright
- IonQ, Inc., College Park, MD, 20740, USA.
| | - K M Beck
- IonQ, Inc., College Park, MD, 20740, USA
| | - S Debnath
- IonQ, Inc., College Park, MD, 20740, USA
| | - J M Amini
- IonQ, Inc., College Park, MD, 20740, USA
| | - Y Nam
- IonQ, Inc., College Park, MD, 20740, USA
| | - N Grzesiak
- IonQ, Inc., College Park, MD, 20740, USA
| | - J-S Chen
- IonQ, Inc., College Park, MD, 20740, USA
| | | | - M Chmielewski
- IonQ, Inc., College Park, MD, 20740, USA.,Joint Quantum Institute and Department of Physics, University of Maryland, College Park, MD, 20742, USA
| | - C Collins
- IonQ, Inc., College Park, MD, 20740, USA
| | - K M Hudek
- IonQ, Inc., College Park, MD, 20740, USA
| | - J Mizrahi
- IonQ, Inc., College Park, MD, 20740, USA
| | | | - S Allen
- IonQ, Inc., College Park, MD, 20740, USA
| | - J Apisdorf
- IonQ, Inc., College Park, MD, 20740, USA
| | - P Solomon
- IonQ, Inc., College Park, MD, 20740, USA
| | - M Williams
- IonQ, Inc., College Park, MD, 20740, USA
| | - A M Ducore
- IonQ, Inc., College Park, MD, 20740, USA
| | - A Blinov
- IonQ, Inc., College Park, MD, 20740, USA
| | | | - V Chaplin
- IonQ, Inc., College Park, MD, 20740, USA
| | - M Keesan
- IonQ, Inc., College Park, MD, 20740, USA
| | - C Monroe
- IonQ, Inc., College Park, MD, 20740, USA.,Joint Quantum Institute and Department of Physics, University of Maryland, College Park, MD, 20742, USA
| | - J Kim
- IonQ, Inc., College Park, MD, 20740, USA.,Department of Electrical and Computer Engineering, Duke University, Durham, NC, 27708, USA
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Nam Y, Park K, Lee S, Ha J, Kim J, Yun H, Han S. SUN-337 ASSOCIATION BETWEEN WEIGHT REDUCTION AND DEVELOPING CARDIOVASCULAR EVENT AMONG THE GENERAL POPULATION. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Nam Y, Lee S, Lee S, Joo Y, Nam K, Park J. MON-039 SMALL KIDNEY SIZE RELATIVE TO BODY MASS IS A RISK FACTOR FOR RENAL FUNCTION DETERIORATION IN IGA NEPHROPATHY PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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LEE G, Han S, Joo Y, Nam Y, Park K. SAT-257 THE ROLE OF NON-TRADITIONAL RISK FACTORS AND BIOMARKERS IN PREDICTION OF CARDIOVASCULAR EVENTS AND MORTALITY IN PATIENTS WITH CHRONIC KIDNEY DISEASE: RESULTS FROM THE KNOW-CKD. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Lee S, Nam K, Park K, Ha J, Nam Y, Lee S, Han S. SUN-028 PROGNOSTIC VALUE OF MESANGIAL C3 AND C4d DEPOSITION IN IgA NEPHROPATHY. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Lee S, Nam K, Lee G, Nam Y, Lee J, Joo Y, Han S. SAT-199 ASSOCIATION BETWEEN SERUM LIPID PROFILES AND PROGRESSION OF CKD: KNOW-CKD STUDY. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Nam Y, Lee G, Lee S, Lee J, Lee C, Yun H, Han S. SUN-225 CHANGES IN BODY MASS INDEX AND INCIDENT CHRONIC KIDNEY DISEASE GENERAL POPULATION: A COMMUNITY-BASED COHORT STUDY. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Sabot R, Giacalone JC, Nam Y, Berne A, Brun C, Elbèze D, Faisse F, Gargiulo L, Kim M, Lee W, Lotte P, Park HK, Santraine B, Yun G. Development of Microwave Imaging Diagnostics for WEST Tokamak. J Fusion Energ 2019. [DOI: 10.1007/s10894-019-00216-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Affiliation(s)
- Y. Nam
- Department of Oral Medicine and Oral Diagnosis; School of Dentistry and Dental Research Institute; Seoul National University; Seoul Korea
| | - H.-G. Kim
- Biomedical Knowledge Engineering Laboratory; School of Dentistry and Dental Research Institute; Seoul National University; Seoul Korea
| | - H.-S. Kho
- Department of Oral Medicine and Oral Diagnosis; School of Dentistry and Dental Research Institute; Seoul National University; Seoul Korea
- Institute on Aging; Seoul National University; Seoul Korea
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Moreau P, Bucalossi J, Missirlian M, Samaille F, Courtois X, Gil C, Lotte P, Meyer O, Nardon E, Nouailletas R, Ravenel N, Travere J, Alarcon T, Antusch S, Aumeunier M, Barjat P, Belsare S, Bernard J, Bhandarkar M, Bottereau C, Bourdelle C, Brémond S, Camenen Y, Chaudhari V, Chavda C, Chernyshova M, Clairet F, Colnel J, Czarski T, Choi M, Colledani G, Corre Y, Daniel R, Davis D, Dejarnac R, Devynck P, Dhongde J, Douai D, Elbeze D, Escarguel A, Fenzi C, Figacz W, Guangwu Z, Giacalone J, Guirlet R, Gunn J, Hacquin S, Hao X, Harris J, Hoang G, Houry M, Imbeaux F, Jablonski S, Jardin A, Joshi H, Kasprowicz G, Klepper C, Kowalska-Strzeciwilk E, Kubkowska M, Kumar A, Kumar V, Kumari P, Laqua H, Le-Luyer A, Lee W, Lewerentz M, Lyu B, Malard P, Manenc L, Mansuri I, Marandet Y, Masand H, Mazon D, Molina D, Moureau G, Nam Y, Park H, Pascal J, Patel K, Patel M, Pozniak K, Radloff D, Ranjan S, Rapson C, Raupp G, Rieth M, Sabot R, Santraine B, Sestac D, Sharma M, Shen J, Signoret J, Soni J, Spring A, Spuig P, Sugandhi R, Treuterrer W, Tsitrone E, Varshney S, Vartanian S, Volpe D, Wang F, Werner A, Yun G, Zabolotny W, Zhao W. Measurements and controls implementation for WEST. Fusion Engineering and Design 2017. [DOI: 10.1016/j.fusengdes.2017.01.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Nam Y, Huang J, Lee E, Sherraden M. SOCIAL NETWORK, INFORMATION SEEKING AND OLDER ASIAN IMMIGRANTS’ FINANCIAL CAPABILITY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Y. Nam
- University at Buffalo, State University of New York, Buffalo, New York,
| | - J. Huang
- Saint Louis University, Saint Louis, Missouri,
| | - E. Lee
- National Asian Pacific Center on Aging, Seattle, Washington,
| | - M. Sherraden
- University of Missouri–St. Louis, St. Louis, Missouri
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Nam Y, Kim NH, Kho HS. Geriatric oral and maxillofacial dysfunctions in the context of geriatric syndrome. Oral Dis 2017; 24:317-324. [PMID: 28142210 DOI: 10.1111/odi.12647] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 01/17/2017] [Accepted: 01/26/2017] [Indexed: 12/28/2022]
Abstract
OBJECTIVES To propose the application of the concept of geriatric syndrome for common geriatric oral and maxillofacial dysfunctions and to suggest the necessity of developing effective evaluation methods for oral and maxillofacial frailty. DESIGN The concepts of frailty and geriatric syndrome based on multi-morbidity and polypharmacy were applied to five common geriatric oral medicinal dysfunctional problems: salivary gland hypofunction (dry mouth), chronic oral mucosal pain disorders (burning mouth symptoms), taste disorders (taste disturbances), swallowing disorders (dysphagia), and oral and maxillofacial movement disorders (oromandibular dyskinesia and dystonia). RESULTS Each of the dysfunctions is caused by various kinds of diseases and/or conditions and medications, thus the concept of geriatric syndrome could be applied. These dysfunctions, suggested as components of oral and maxillofacial geriatric syndrome, are associated and interacted with each other in a complexity of vicious cycle. The resulting functional impairments caused by this syndrome can cause oral and maxillofacial frailty. CONCLUSIONS Geriatric oral and maxillofacial dysfunctions could be better appreciated in the context of geriatric syndrome. The development of effective methods for evaluating the severity of these dysfunctions and the resulting frailty is essential.
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Affiliation(s)
- Y Nam
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Jongno-gu, Seoul, Korea
| | - N-H Kim
- Department of Dental Hygiene, Wonju College of Medicine, Yonsei University, Wonju, Gangwon-do, Korea
| | - H-S Kho
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Jongno-gu, Seoul, Korea.,Institute on Aging, Seoul National University, Gwanak-Gu, Seoul, Korea
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Kim SY, Kim K, Hwang YH, Park J, Jang J, Nam Y, Kang Y, Kim M, Park HJ, Lee Z, Choi J, Kim Y, Jeong S, Bae BS, Park JU. High-resolution electrohydrodynamic inkjet printing of stretchable metal oxide semiconductor transistors with high performance. Nanoscale 2016; 8:17113-17121. [PMID: 27722626 DOI: 10.1039/c6nr05577j] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
As demands for high pixel densities and wearable forms of displays increase, high-resolution printing technologies to achieve high performance transistors beyond current amorphous silicon levels and to allow low-temperature solution processability for plastic substrates have been explored as key processes in emerging flexible electronics. This study describes electrohydrodynamic inkjet (e-jet) technology for direct printing of oxide semiconductor thin film transistors (TFTs) with high resolution (minimum line width: 2 μm) and superb performance, including high mobility (∼230 cm2 V-1 s-1). Logic operations of the amplifier circuits composed of these e-jet-printed metal oxide semiconductor (MOS) TFTs demonstrate their high performance. Printed In2O TFTs with e-jet printing-assisted high-resolution S/D electrodes were prepared, and the direct printing of passivation layers on these channels enhanced their gate-bias stabilities significantly. Moreover, low process temperatures (<250 °C) enable the use of thin plastic substrates; highly flexible and stretchable TFT arrays have been demonstrated, suggesting promise for next-generation printed electronics.
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Affiliation(s)
- S-Y Kim
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - K Kim
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - Y H Hwang
- Radiation and Environmental Lab., Central Research Institute, Korea Hydro and Nuclear Power, Daejeon Metropolitan City, 34114, Republic of Korea
| | - J Park
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - J Jang
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - Y Nam
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon Metropolitan City, 34141, Republic of Korea.
| | - Y Kang
- School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea
| | - M Kim
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - H J Park
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - Z Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
| | - J Choi
- School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea
| | - Y Kim
- Department of Computer Engineering, Kwangwoon University, Seoul Metropolitan City, 01897, Republic of Korea
| | - S Jeong
- Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon Metropolitan City, 34114, Republic of Korea
| | - B-S Bae
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon Metropolitan City, 34141, Republic of Korea.
| | - J-U Park
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan Metropolitan City, 44919, Republic of Korea.
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Song K, Min T, Jung JY, Shin D, Nam Y. A superhydrophilic nitinol shape memory alloy with enhanced anti-biofouling and anti-corrosion properties. Biofouling 2016; 32:535-545. [PMID: 27021115 DOI: 10.1080/08927014.2016.1153633] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work reports on a nitinol (NiTi) surface modification scheme based on a chemical oxidation method, and characterizes its effects on wetting, biofouling and corrosion. The scheme developed is also compared with selected previous oxidation methods. The proposed method turns NiTi into superhydrophilic in ~5 min, and the static contact angle and contact angle hysteresis were measured to be ~7° and ~12°, respectively. In the PRP (platelet rich plasma) test, platelet adhesion was reduced by ~89% and ~77% respectively, compared with the original NiTi and the NiTi treated with the previous chemical oxidation scheme. The method developed provides a high (~1.1 V) breakdown voltage, which surpasses the ASTM standard for intervascular medical devices. It also provides higher superhydrophilicity, hemo-compatibility and anti-corrosion resistance than previous oxidation schemes, with a significantly reduced process time (~5 min), and will help the development of high performance NiTi devices.
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Affiliation(s)
- K Song
- a Department of Mechanical Engineering , Kyung Hee University , Yongin , Republic of Korea
| | - T Min
- b R&D Center , S&H Co., Ltd , Suwon , Republic of Korea
| | - J-Y Jung
- c Technology Center for Offshore Plant Industries , Korea Research Institute of Ships and Ocean Engineering , Daejeon , Republic of Korea
| | - D Shin
- d Department of Clinical Pharmacology , Seoul National University Hospital , Seoul , Republic of Korea
| | - Y Nam
- a Department of Mechanical Engineering , Kyung Hee University , Yongin , Republic of Korea
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Nam Y, Jung J, Park SS, Kim SJ, Shin SJ, Choi JH, Kim M, Yoon HE. Disseminated mucormycosis with myocardial involvement in a renal transplant recipient. Transpl Infect Dis 2015; 17:890-6. [PMID: 26538076 DOI: 10.1111/tid.12452] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 08/05/2015] [Accepted: 08/13/2015] [Indexed: 12/20/2022]
Abstract
We report the case of a renal transplant recipient with pulmonary and splenic mucormycosis whose demise was accelerated by a myocardial abscess. Once pulmonary and splenic mucormycosis was diagnosed, liposomal amphotericin B was started and immunosuppressant treatments were discontinued. The pulmonary cavities regressed during treatment, but new myocardial and peri-allograft abscesses developed. The myocardial abscess diffusely infiltrated the left ventricular wall and was associated with akinesia, which led to sudden cardiac arrest. This case demonstrates a rare manifestation of mucormycosis and highlights the fatality and invasiveness of this infection.
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Affiliation(s)
- Y Nam
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea
| | - J Jung
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea
| | - S S Park
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea
| | - S J Kim
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea.,Division of Nephrology, Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Korea
| | - S J Shin
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea.,Division of Nephrology, Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Korea
| | - J H Choi
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea.,Division of Infectious Disease, Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Korea
| | - M Kim
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea.,Division of Cardiology, Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Korea
| | - H E Yoon
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Incheon, Korea.,Division of Nephrology, Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Korea
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Park S, Lee B, Hong J, Lee S, Nam Y. Comparison of Trends in Suicide Methods and Rates Among Older Adults in South Korea and United States. Eur Psychiatry 2015. [DOI: 10.1016/s0924-9338(15)31386-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Yun GS, Lee W, Choi MJ, Lee J, Kim M, Leem J, Nam Y, Choe GH, Park HK, Park H, Woo DS, Kim KW, Domier CW, Luhmann NC, Ito N, Mase A, Lee SG. Quasi 3D ECE imaging system for study of MHD instabilities in KSTAR. Rev Sci Instrum 2014; 85:11D820. [PMID: 25430233 DOI: 10.1063/1.4890401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A second electron cyclotron emission imaging (ECEI) system has been installed on the KSTAR tokamak, toroidally separated by 1/16th of the torus from the first ECEI system. For the first time, the dynamical evolutions of MHD instabilities from the plasma core to the edge have been visualized in quasi-3D for a wide range of the KSTAR operation (B0 = 1.7∼3.5 T). This flexible diagnostic capability has been realized by substantial improvements in large-aperture quasi-optical microwave components including the development of broad-band polarization rotators for imaging of the fundamental ordinary ECE as well as the usual 2nd harmonic extraordinary ECE.
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Affiliation(s)
- G S Yun
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - W Lee
- Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
| | - M J Choi
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - J Lee
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - M Kim
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - J Leem
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Y Nam
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - G H Choe
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - H K Park
- Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
| | - H Park
- School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea
| | - D S Woo
- School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea
| | - K W Kim
- School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea
| | - C W Domier
- Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA
| | - N C Luhmann
- Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA
| | - N Ito
- KASTEC, Kyushu University, Kasuga-shi, Fukuoka 812-8581, Japan
| | - A Mase
- Ube National College of Technology, Ube-shi, Yamaguchi 755-8555, Japan
| | - S G Lee
- National Fusion Research Institute, Daejeon 305-333, Korea
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Im K, Kim N, Lim J, Nam Y, Lee E, Chae E, Kim E, Cho S. Induction of mixed chimerism using combinatory cell-based immune modulation with MSCs and Tregs in early post-transplant period. Cytotherapy 2014. [DOI: 10.1016/j.jcyt.2014.01.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kim N, Lim J, Im K, Lee E, Nam Y, Kim E, Chae E, Cho S. IL-21 expressing mesenchymal stem cells can prevent lethal B-cell lymphoma through efficient delivery of IL-21 which redirects the immune system against tumor. Cytotherapy 2014. [DOI: 10.1016/j.jcyt.2014.01.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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38
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Nam Y, Lee W, Yun GS, Park HK, Elbeze D, Segui JL, Sabot R, Chenevoix JP. Design of the reflective optics for Tore Supra ECEI system. Rev Sci Instrum 2012; 83:10E318. [PMID: 23126976 DOI: 10.1063/1.4732852] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A 2D electron cyclotron emission (ECE) imaging system for Tore Supra is under design for studying the MHD physics of the magnetically confined plasma such as sawteeth, tearing modes, and turbulent fluctuations. Complex beam path due to the tight access in Tore Supra led to the design of reflective optics made of 6 or more large cylindrical∕flat mirrors. The total path length of the ECE beam is about 11 m, including almost 4 m inside the vacuum vessel. The imaging property of the optics has been estimated using the Gaussian beam simulation and ray transfer analysis. The possible setups for the optical alignment of the diagnostic and the operation scenarios with single- or dual-array measurement system are discussed.
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Affiliation(s)
- Y Nam
- Department of Physics, POSTECH, Pohang, Gyeongbuk 790-784, South Korea
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Hwang E, Nam Y, Jin H, Shin Y, Ye Y, Nahm D, Park H. The Predictors of Elderly Asthma Control. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ye Y, Jin H, Hwang E, Nam Y, Kim J, Shin Y, Park H. Metabolic Syndrome In Patients With Chronic Urticaria. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Lee S, Park M, Kim K, Nam Y, Lee H, Jeong I, Park S, Um S, Son C. Pitfalls In The Diagnosis Of Allergic Bronchopulmonary Aspergillosis In Patients With Asthma In Real Clinical Practice. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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43
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Nam Y. Immunologic Evaluation of Quinolone Hypersensitivity. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Lee W, Yun GS, Nam Y, Hong I, Kim JB, Park HK, Tobias B, Liang T, Domier CW, Luhmann NC. Comparative study between the reflective optics and lens based system for microwave imaging system on KSTAR. Rev Sci Instrum 2010; 81:10D932. [PMID: 21033960 DOI: 10.1063/1.3491189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Recently, two-dimensional microwave imaging diagnostics such as the electron cyclotron emission imaging (ECEI) system and microwave imaging reflectometry (MIR) have been developed to study magnetohydrodynamics instabilities and turbulence in magnetically confined plasmas. These imaging systems utilize large optics to collect passive emission or reflected radiation. The design of this optics can be classified into two different types: reflective or refractive optical systems. For instance, an ECEI/MIR system on the TEXTOR tokamak [Park et al., Rev. Sci. Instrum. 75, 3787 (2004)] employed the reflective optics which consisted of two large mirrors, while the TEXTOR ECEI upgrade [B. Tobias et al., Rev. Sci. Instrum. 80, 093502 (2009)] and systems on DIII-D, ASDEX-U, and KSTAR adopted refractive systems. Each system has advantages and disadvantages in the standing wave problem and optical aberrations. In this paper, a comparative study between the two optical systems has been performed in order to design a MIR system for KSTAR.
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Affiliation(s)
- W Lee
- POSTECH, Pohang, Gyeongbuk 790-784, Republic of Korea.
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45
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Nam Y, Chung H, Lee JY, Kim JG, Yoon YH. Reply to Hu et al. Eye (Lond) 2009. [DOI: 10.1038/eye.2009.287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Abstract
Embryonic rat hippocampal neurons were cultured in order to gain insights into how small networks of neurons interact. The principal observations are the electrical activities recorded with the electrode arrays, primarily action potentials both spontaneous and evoked. Several lithographic techniques were developed for controlling with micrometer precision the patterns of surface molecules in order to control neuronal attachment and growth. Cytophilic polylysine against protein repellent and hence cytophobic polyethylene glycol were used. By combining the cellular lithography with the microelectrode arrays it was possible to guide neurons preferentially to electrodes and to begin to investigate the question as to whether the geometric pattern of a neuronal network influences the patterns of its neuroelectric activity. It is clear that the techniques are adequate to ensure contact of neurons to electrodes but not to ensure the recording of signals, even when neurons lie directly on top of electrodes. The maturation of neuroelectric activity depends on the growth of glia within the culture, such that spontaneous activity appears to become robust when the number of glia is roughly the same as the number of neurons.
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Affiliation(s)
- Y Nam
- Beckman Institute and Electrical & Computer Engineering Department, University of Illinois, Urbana-Champaign, 61801, USA
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Jang J, Nam Y, Yoon H. Fabrication of Polypyrrole- Poly(N-vinylcarbazole) Core-Shell Nanoparticles with Excellent Electrical and Optical Properties. Adv Mater 2005; 17:1382-1386. [PMID: 34412434 DOI: 10.1002/adma.200401841] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Accepted: 03/04/2005] [Indexed: 06/13/2023]
Abstract
Polypyrrole-poly(N-vinylcarbazole) (PPy-PVK) core-shell nanoparticles have been fabricated by nanoparticle-seeded dispersion polymerization. The monodisperse PPy nanoseeds are fabricated by micelle templating, and the PVK shell thickness is easily tuned by varying the amount of N-vinylcarbazole monomer. The PPy core and PVK shell produce superior conductivity and fluorescence, respectively.
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Affiliation(s)
- J Jang
- Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea
| | - Y Nam
- Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea
| | - H Yoon
- Hyperstructured Organic Materials Research Center and School of Chemical Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea
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Abstract
The application of microelectromechanical systems (MEMS) to medicine is described. Three types of biomedical devices are considered, including diagnostic microsystems, surgical microsystems, and therapeutic microsystems. The opportunities of MEMS miniaturization in these emerging disciplines are considered, with emphasis placed on the importance of the technology in providing a better outcome for the patient and a lower overall health care cost. Several case examples in each of these areas are described. Key aspects of MEMS technology as it is applied to these three areas are described, along with some of the fabrication challenges.
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Affiliation(s)
- D L Polla
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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Buttery RG, Takeoka GR, Naim M, Rabinowitch H, Nam Y. Analysis of Furaneol in tomato using dynamic headspace sampling with sodium sulfate. J Agric Food Chem 2001; 49:4349-51. [PMID: 11559136 DOI: 10.1021/jf0105236] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
High-flow dynamic headspace sampling with excess anhydrous sodium sulfate was found to be an effective method of isolating Furaneol from fresh tomatoes. Quantitative analysis was carried out by gas chromatography using maltol as internal standard. Furaneol was found in the highest concentrations (660-1100 ppb) in the summer crop of home-grown tomatoes and in some of the greenhouse hydroponically grown tomatoes, which are ripened on the plant before being transported to the supermarkets. Furaneol was found in the lowest concentrations (38-180 ppb) in the common ethylene-ripened, field-grown, supermarket tomatoes.
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Affiliation(s)
- R G Buttery
- Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, California 94710, USA
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50
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Stöver T, Nam Y, Gong TL, Lomax MI, Altschuler RA. Glial cell line-derived neurotrophic factor (GDNF) and its receptor complex are expressed in the auditory nerve of the mature rat cochlea. Hear Res 2001; 155:143-51. [PMID: 11335084 DOI: 10.1016/s0378-5955(01)00227-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Glial cell line-derived neurotrophic factor (GDNF) is a survival factor for many neuronal cell types which signals through a heterodimer receptor consisting of GDNF-family receptor alpha 1 (GFRalpha-1) and Ret (rearranged during transformation). GDNF expression has previously been reported in the inner hair cells of the rat cochlea, with expression of GFRalpha-1 but not Ret in the cell bodies of the auditory nerve (spiral ganglion cells), using in situ hybridization. The present study used reverse transcription-polymerase chain reaction (RT-PCR), and immunocytochemistry to examine GDNF, GFRalpha-1 and Ret in the adult rat auditory nerve. Semi-quantitative RT-PCR showed expression of GDNF and the two receptor components, GFRalpha-1 and Ret, in the modiolar subfraction of the cochlea containing spiral ganglion cells. A shorter mRNA splice variant for GDNF was also detected. Immunocytochemistry showed immunostaining in the modiolus for GDNF, GFRalpha-1 and Ret that was confined to spiral ganglion cells. When RT-PCR expression levels were compared to the expression in the substantia nigra, GFRalpha-1 expression levels were similar, Ret mRNA was lower in the modiolus and GDNF expression was higher in the modiolus. However, when GDNF was further assessed using Western blot, while GDNF protein was found in the modiolus it was at lower levels than in substantia nigra tissue. These results demonstrate that GDNF and both of its receptor components are found in spiral ganglion cells of the adult rat cochlea. Along with the previous report of GDNF in inner hair cells, these new results provide a basis for the role of GDNF as a survival factor for the auditory nerve, as suggested by previous studies.
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Affiliation(s)
- T Stöver
- Department of Otolaryngology/Head and Neck Surgery, The University of Michigan Medical School, Ann Arbor, MI 48109-0506, USA
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