12 results on '"Dong Min Son"'
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2. Visible and NIR Image Synthesis Using Laplacian Pyramid and Principal Component Analysis
- Author
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Dong-Min Son, Sung-Hak Lee, and Hyuk-Ju Kwon
- Subjects
business.industry ,Principal component analysis ,Laplacian pyramid ,Pattern recognition ,Artificial intelligence ,business ,Image synthesis ,Mathematics - Published
- 2020
3. Automatic Detection of Mandibular Fractures in Panoramic Radiographs Using Deep Learning
- Author
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Hyuk-Ju Kwon, Chang-Hyeon An, Sung-Hak Lee, Yeong-Ah Yoon, and Dong-Min Son
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Medicine (General) ,Panoramic radiograph ,YOLO v4 ,Computer science ,Radiography ,Mandibular fracture ,Clinical Biochemistry ,Image processing ,Luminance ,Article ,single-scale luminance adaptation transform (SLAT) ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,R5-920 ,0302 clinical medicine ,stomatognathic system ,medicine ,multi-scale luminance adaptation transform (MLAT) ,YOLO ,Orthodontics ,Modality (human–computer interaction) ,business.industry ,Deep learning ,deep learning ,object detection ,030206 dentistry ,medicine.disease ,Object detection ,image processing ,mandibular fracture ,panoramic radiography ,Artificial intelligence ,business - Abstract
Mandibular fracture is one of the most frequent injuries in oral and maxillo-facial surgery. Radiologists diagnose mandibular fractures using panoramic radiography and cone-beam computed tomography (CBCT). Panoramic radiography is a conventional imaging modality, which is less complicated than CBCT. This paper proposes the diagnosis method of mandibular fractures in a panoramic radiograph based on a deep learning system without the intervention of radiologists. The deep learning system used has a one-stage detection called you only look once (YOLO). To improve detection accuracy, panoramic radiographs as input images are augmented using gamma modulation, multi-bounding boxes, single-scale luminance adaptation transform, and multi-scale luminance adaptation transform methods. Our results showed better detection performance than the conventional method using YOLO-based deep learning. Hence, it will be helpful for radiologists to double-check the diagnosis of mandibular fractures.
- Published
- 2021
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4. Regional Weighted Generative Adversarial Network for LDR to HDR Image Conversion
- Author
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Hyuk-Ju Kwon, Dong-Min Son, Sung-Woon Jung, and Sung-Hak Lee
- Subjects
0209 industrial biotechnology ,Artificial neural network ,Computer science ,Dynamic range ,business.industry ,Deep learning ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,02 engineering and technology ,Iterative reconstruction ,Luminance ,Image conversion ,020901 industrial engineering & automation ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Computer vision ,Artificial intelligence ,business ,High dynamic range - Abstract
For the image conversion from low dynamic range images to high dynamic range images, we considered the possibility of using the Generative Adversarial Network (GAN) as one of the deep neural network methods. Deep learning requires a lot of data before building a module, but once creation is done, it is convenient to use it. In this paper, we proposed a weighting map for a local luminance based learning to reconstruct locally tone-mapped images.
- Published
- 2020
5. Risk of rod fracture according to cross-link position in pedicle subtraction osteotomy (PSO): A finite element study
- Author
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Seil Sohn, Su Heon Woo, Sung-Jae Lee, Chun Kee Chung, Un Yong Choi, Tae Hyun Park, Je Beom Hong, Inbo Han, Dong Min Son, and Yongjung Jay Kim
- Subjects
medicine.medical_treatment ,Finite Element Analysis ,Osteotomy ,Stress (mechanics) ,Postoperative Complications ,Position (vector) ,Pedicle Screws ,Physiology (medical) ,medicine ,von Mises yield criterion ,Humans ,Range of Motion, Articular ,Aged ,Lumbar Vertebrae ,business.industry ,Subtraction ,General Medicine ,Structural engineering ,Sagittal plane ,Finite element method ,medicine.anatomical_structure ,Spinal Fusion ,Neurology ,Fracture (geology) ,Surgery ,Female ,Neurology (clinical) ,business - Abstract
Purpose The purpose of this study is to investigate the effect of the cross-link position on the rod fracture phenomenon during pedicle subtraction osteotomy (PSO) surgery using finite element model (FEM). Methods A three-dimensional finite element model of a lumbar spine with sagittal imbalance was constructed using computed tomography data of a 65-year-old female patient. After simulating the standard PSO at the L4 level, we constructed four models, specifically a model without a cross-link and three models with a cross-link at three different sites. The peak von Mises stress (PVMS) of the rod around the PSO site was measured after applying physiological loads (flexion, extension, axial rotation, and lateral bending) in each model. Results The measured PVMS outcomes at the PSO site were 135.8, 135.9, 208.9, and 384.7 MPa for model 1, 2, 3, and 4 during flexion, and 180.0, 180.1, 210.1, and 445.7 MPa during extension. These results show that when the cross-link is located at the PSO site, the rod stress at the PSO site increases significantly during flexion and extension. As the cross-link moved away from the PSO site, the effect on the rod stress decreased. When the cross-link was placed two levels away from the PSO site, the rod stress was scarcely affected. Conclusion When the cross-link during PSO surgery was positioned two levels away from the PSO site, the risk of rod fracture did not increase.
- Published
- 2019
6. Visible and Near-Infrared Image Synthesis Using PCA Fusion of Multiscale Layers
- Author
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Sung-Hak Lee, Dong-Min Son, and Hyuk-Ju Kwon
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principal component analysis ,Computer science ,media_common.quotation_subject ,02 engineering and technology ,lcsh:Technology ,near-infrared ,soft mixing ,Image (mathematics) ,lcsh:Chemistry ,0202 electrical engineering, electronic engineering, information engineering ,Contrast (vision) ,General Materials Science ,image enhancement ,lcsh:QH301-705.5 ,Instrumentation ,media_common ,Fluid Flow and Transfer Processes ,lcsh:T ,business.industry ,Process Chemistry and Technology ,Near-infrared spectroscopy ,General Engineering ,020206 networking & telecommunications ,Pattern recognition ,Filter (signal processing) ,Laplacian pyramid ,stevens effect ,lcsh:QC1-999 ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Computer Science::Computer Vision and Pattern Recognition ,Principal component analysis ,Radiance ,Chrominance ,020201 artificial intelligence & image processing ,Enhanced Data Rates for GSM Evolution ,Artificial intelligence ,lcsh:Engineering (General). Civil engineering (General) ,business ,lcsh:Physics - Abstract
This study proposes a method of blending visible and near-infrared (NIR) images to enhance their edge details and local contrast based on the Laplacian pyramid and principal component analysis (PCA). In the proposed method, both the Laplacian pyramid and PCA are implemented to generate a radiance map. Using the PCA algorithm, the soft-mixing method and the mask-skipping filter were applied when the images were fused. The color compensation method uses the ratio between the radiance map fused by the Laplacian pyramid and the PCA algorithm and the luminance channel of the visible image to preserve the chrominance of the visible image. The results show that the proposed method improves edge details and local contrast effectively.
- Published
- 2020
7. [Factors associated with Self-Rated Health in Metabolic Syndrome and Relationship between Sleep Duration and Metabolic Syndrome Risk Factors]
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Sun Ah Kim, Ok Kyung Ham, Jae Yeon Lee, Dong Min Son, and Bo Gyeong Lee
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Adult ,Blood Glucose ,Male ,medicine.medical_specialty ,Waist ,National Health and Nutrition Examination Survey ,Health Status ,education ,Blood Pressure ,chemistry.chemical_compound ,Young Adult ,High-density lipoprotein ,Quality of life ,Risk Factors ,medicine ,Odds Ratio ,Humans ,General Nursing ,Self-rated health ,Metabolic Syndrome ,business.industry ,Cholesterol, HDL ,Secondary data ,Middle Aged ,medicine.disease ,Blood pressure ,chemistry ,Physical therapy ,Quality of Life ,Female ,Self Report ,Metabolic syndrome ,business ,Sleep ,Demography - Abstract
Purpose: Purpose was to explore associations between sleep duration and metabolic syndrome (MS) risks, and to determine factors associated with self-rated health (SRH) of adults with MS compared to other adults. Methods: This is a secondary data analysis based on the Fifth Korea National Health and Nutrition Examination Survey KNHANES V (N=12662). Study instruments included sleep duration, MS risk factors, SRH and health-related quality of life (HRQoL). Results: Mean age of participants was 43.68±12.26 years. Fifty-eight percent were women, and 18.3% were identified as having MS. Systolic blood pressure (SBP), diastolic blood pressure (DBP), and SRH were significantly different according to sleep duration (p
- Published
- 2015
8. A system model expansion for smart appliance demand response based on SEP2.0
- Author
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Dongyun Hwang, Sung-Yong Son, Seakbai Koh, Younghyun Kim, and Dong Min Son
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Demand response ,Engineering ,Load management ,Smart grid ,business.industry ,Interface (computing) ,Embedded system ,Computer appliance ,NIST ,business ,Field (computer science) ,Automotive engineering ,System model - Abstract
This paper proposes a system model to improve the utilization of smart appliances for smart grid demand response by expanding smart energy profile (SEP) 2.0. The original smart appliance system model was designed assuming that there exists a device with an energy service interface model in the home environment, but this is not common in the real world. Our proposed expansion of SEP 2.0 allows the use of smart appliances even without an energy service interface; thus, it can lead to an increase in the demand response participation of appliances. The effectiveness of the proposed model is verified through a field test conducted with appliance manufacturers and a utility company.
- Published
- 2015
9. A simulation study of the PLC-MAC performance using network simulator-2
- Author
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Young-Bae Ko, Younghyun Kim, Min-Soo Kim, and Dong-Min Son
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Power-line communication ,Electric power system ,business.industry ,Computer science ,Encoding (memory) ,Frame (networking) ,Physical layer ,Time division multiple access ,Access control ,business ,Protocol (object-oriented programming) ,Computer network - Abstract
Power line communication (PLC) technology can be a viable solution for the future ubiquitous networks because it provides a cheaper alternative to other wired technology currently being used for communication. However, for the better performance of PLC-based networks, their physical layer and medium access control (MAC) protocols need to be a lot more enhanced. Recently, many physical frame encoding technologies have been developed, but the MAC protocols still need more consideration because of the unique characteristics of power line channels. In this paper, we describe an overview of the Korea Standard power line MAC protocol (called "KS-MAC"). We also report the simulation results performed with the well-known simulation tool of network simulator-2 (i.e., NS-2) and compared with the actual field test data.
- Published
- 2008
10. k + Neigh: An Energy Efficient Topology Control for Wireless Sensor Networks
- Author
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Young-Bae Ko and Dong-Min Son
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Key distribution in wireless sensor networks ,business.industry ,Topology control ,Computer science ,Node (networking) ,Sensor node ,Computer Science::Networking and Internet Architecture ,Mobile wireless sensor network ,Topology (electrical circuits) ,business ,Wireless sensor network ,Computer network ,Efficient energy use - Abstract
For most applications in wireless sensor networks (WSNs), it is often assumed that the deployment of sensor nodes is unmanaged and random, so the density of local node may vary throughout the network. In high density areas, nodes consume more energy due to frequent packet collisions and retransmissions. One of the ways to alleviate this problem is to adjust the transmission power of each sensor node by means of efficient topology control mechanisms. In this paper, we propose an efficient topology control for energy conservation, named "k+ Neigh." In our scheme, each sensor node reduces its transmission power so that it has minimum number of k neighbor nodes. Later, we will show that the preferred value of the k is 2 by simulation. In the performance evaluation, the proposed scheme can make significant energy saving with such a topology structure, while the network connectivity is guaranteed.
- Published
- 2007
11. An Energy Efficient Cross-Layer MAC Protocol for Wireless Sensor Networks
- Author
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Dong-Min Son, Young-Bae Ko, and Changsu Suh
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business.industry ,Computer science ,Node (networking) ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Energy consumption ,Network layer ,Key distribution in wireless sensor networks ,Computer Science::Networking and Internet Architecture ,Routing (electronic design automation) ,Layer (object-oriented design) ,Telecommunications ,business ,Wireless sensor network ,Efficient energy use ,Computer network - Abstract
In the area of wireless sensor networks, achieving minimum energy consumption is a very important research issue. A number of energy efficient protocols have been proposed, mostly based on a layered design approach, which means that they are focused on designing optimal strategies for “single” layer only. In this paper, we take an alternative approach i.e., a cross-layer design, and present a new MAC protocol named MAC-CROSS. In this new approach, the interactions between MAC and Routing layers are fully exploited to achieve energy efficiency for wireless sensor networks. More precisely, in the proposed MAC-CROSS algorithm, routing information at the network layer is utilized for the MAC layer such that it can maximize a sleep duration of each node. Through implementation on a Mica Mote platform and simulation study using the NS-2, we evaluate a performance of the presented MAC-CROSS and prove its substantial performance gains.
- Published
- 2006
12. Evaluation of a Water-based Bolus Device for Radiotherapy to the Extremities in Kaposi's Sarcoma Patients
- Author
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Joo Ho Kim, Jung Hee Cho, Dong Wook Kim, Dong Min Son, Seung Kwon Ahn, Ik Jae Lee, Yung Jae Jang, Chang Ok Suh, Yong Bae Kim, Jaeho Cho, and Tae Soo Song
- Subjects
Radiation therapy ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,medicine ,Radiology ,business ,medicine.disease ,Bolus (radiation therapy) ,Kaposi's sarcoma ,Water based ,Surgery - Published
- 2008
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