https://scholar.dgist.ac.kr/handle/20.500.11750/127 Mon, 03 Aug 2026 12:16:43 GMT 2026-08-03T12:16:43Z https://scholar.dgist.ac.kr/handle/20.500.11750/60456 Title: Fractionation of multiscale particle mixtures using acoustic field-flow fractionation with steric and normal mode combination Author(s): Jeong, Soowoong; Hwang, Jae Youn; Yang, In-Hwan Abstract: An acoustic field-flow fractionation (FFF) system was developed to fractionate particle mixtures with a wide size distribution by combining steric and normal mode mechanisms. The system utilized piezoelectric transducers on the top surface of the channel to generate a stable quarter-wavelength standing wave in the carrier liquid flow, controlled by the sinusoidal voltage amplitude. The acoustic radiation force from the ultrasonic standing wave suppressed Brownian diffusion, allowing for the vertical equilibrium distribution of Brownian-diffusive particles to be confined. This enabled their transport and elution by the carrier liquid velocity at the centroid of their distribution without impacting non-diffusive particles. Experimental results showed that the acoustic radiation force generated by the established standing acoustic wave field, which increases with applied voltage, effectively inhibited Brownian diffusion of 1.0 & micro;m particles at an applied voltage of 20 Vpp, thereby directing their transport according to the steric mode. Additionally, successful fractionation of a particle mixture comprising particles with radii of 350 nm, 550 nm, 1.0 & micro;m, 2.5 & micro;m, and 5.0 & micro;m demonstrated that the acoustic FFF system could separate particles across a wide size range using a hybrid separation mode that combines steric and normal modes. Theoretical predictions suggested that at an applied voltage of 80 Vpp, the acoustic FFF channel could extend the normal mode fractionation to particles below 45 nm, facilitating the separation of multiscale particle mixtures without the need for preprocessing. Thu, 30 Apr 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60456 2026-04-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/58607 Title: Expert-level differentiation of incomplete Kawasaki disease and pneumonia from echocardiography via multiple large receptive attention mechanisms Author(s): Lee, Haeyun; Lee, Kyungsu; Lee, Moon Hwan; Kim, Sewoong; Eun, Yongsoon; Eun, Lucy Youngmin; Hwang, Jae Youn Abstract: Background: Incomplete Kawasaki disease (KD) is challenging to diagnose due to its lack of classic clinical features, yet it has a higher incidence of coronary artery lesions, making early detection crucial. Echocardiography plays a vital role in identifying these lesions, but differentiating incomplete KD from other febrile illnesses, such as COVID-19, is difficult. Algorithms capable of achieving expert-level performance are needed to aid diagnosis, particularly in the absence of pediatric cardiologists. Methods: To address this need, we developed two novel deep learning models: the Multiple Receptive Attention Network (MRANet) and the Multiple Large Receptive Attention Network (MLRANet). These models incorporate multiple receptive attention layers and multiple large receptive attention layers to enhance their ability to identify KD-related coronary artery abnormalities on echocardiography. The models were trained and tested on 203 echocardiographic datasets and compared with advanced deep learning models to assess diagnostic performance. Results: Both MRANet and MLRANet outperformed existing deep learning models, achieving diagnostic accuracy comparable to experienced pediatric cardiologists. Notably, MLRANet demonstrated the highest sensitivity (93.48%) and specificity (66.15%), exceeding expert-level performance in detecting coronary artery abnormalities. Furthermore, MLRANet was able to distinguish incomplete KD from pneumonia effectively, showing diagnostic results aligned with the KD specialists. Conclusions: MLRANet has proven to be a valuable tool for computer-aided diagnosis of incomplete KD, offering accurate and reliable detection of coronary artery abnormalities without requiring specialist input. These findings suggest that MLRANet can facilitate timely and precise incomplete KD diagnosis, improving patient outcomes and addressing the shortage of pediatric cardiologists worldwide. © 2025 Elsevier Ltd Sun, 31 Aug 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/58607 2025-08-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/58156 Title: SoN: Selective Optimal Network for smartphone-based indoor localization in real-time Author(s): Lee, Kyungsu; Lee, Haeyun; Hwang, Jae Youn Abstract: Deep learning-based scene recognition algorithms have been developed for real-time application in indoor localization systems. However, owing to the slow calculation time resulting from the deep structure of convolutional neural networks, deep learning-based algorithms have limitations in the usage of real-time applications, despite their high accuracy in classification tasks. To significantly reduce the computation time of these algorithms and slightly improve their accuracy, we thus propose a path-selective deep learning network, denoted as Selective Optimal Network (SoN). The SoN selectively uses the depth-variable networks depending on a new indicator, denoted as the classification-complexity of a source image. The SoN reduces the prediction time by selecting optimal depth for the baseline networks corresponding to the input samples. The network was evaluated using two public datasets and two custom datasets for indoor localization and scene classification, respectively. The experimental results indicated that, compared to other deep learning models, the SoN exhibited improved accuracy and enhanced the processing speed by up to 78.59%. Additionally, the SoN was applied to a smartphone-based indoor positioning system in real-time. The results indicated that the SoN shows excellent performance for rapid and accurate classification in real-time applications of indoor localization systems. © 2025 Wed, 30 Apr 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/58156 2025-04-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/57331 Title: Predicting Obstructive Sleep Apnea Based on Computed Tomography Scans Using Deep Learning Models Author(s): Kim, Jeong-Whun; Lee, Kyungsu; Kim, Hyun Jik; Park, Hae Chan; Hwang, Jae Youn; Park, Seok-Won; Kong, Hyoun-Joong; Kim, Jin Youp Abstract: Rationale: The incidence of clinically undiagnosed obstructive sleep apnea (OSA) is high among the general population because of limited access to polysomnography. Computed tomography (CT) of craniofacial regions obtained for other purposes can be beneficial in predicting OSA and its severity. Objectives: To predict OSA and its severity based on paranasal CT using a three-dimensional deep learning algorithm. Methods: One internal dataset (N = 798) and two external datasets (N = 135 and N = 85) were used in this study. In the internal dataset, 92 normal participants and 159 with mild, 201 with moderate, and 346 with severe OSA were enrolled to derive the deep learning model. A multimodal deep learning model was elicited from the connection between a three-dimensional convolutional neural network-based part treating unstructured data (CT images) and a multilayer perceptron-based part treating structured data (age, sex, and body mass index) to predict OSA and its severity. Measurements and Main Results: In a four-class classification for predicting the severity of OSA, the AirwayNet-MM-H model (multimodal model with airway-highlighting preprocessing algorithm) showed an average accuracy of 87.6% (95% confidence interval [CI], 86.8-88.6%) in the internal dataset and 84.0% (95% CI, 83.0-85.1%) and 86.3% (95% CI, 85.3-87.3%) in the two external datasets, respectively. In the two-class classification for predicting significant OSA (moderate to severe OSA), the area under the receiver operating characteristic curve, accuracy, sensitivity, specificity, and F1 score were 0.910 (95% CI, 0.899-0.922), 91.0% (95% CI, 90.1-91.9%), 89.9% (95% CI, 88.8-90.9%), 93.5% (95% CI, 92.7-94.3%), and 93.2% (95% CI, 92.5-93.9%), respectively, in the internal dataset. Furthermore, the diagnostic performance of the Airway Net-MM-H model outperformed that of the other six state-of-the-art deep learning models in terms of accuracy for both four- and two-class classifications and area under the receiver operating characteristic curve for two-class classification (P, 0.001). Conclusions: A novel deep learning model, including a multimodal deep learning model and an airway-highlighting preprocessing algorithm from CT images obtained for other purposes, can provide significantly precise outcomes for OSA diagnosis. Copyright © 2024 by the American Thoracic Society. Sun, 30 Jun 2024 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/57331 2024-06-30T15:00:00Z