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Article ; Online: Lateral heterostructures of WS

Park, Jaeseo / Kim, Jun Oh / Kang, Sang-Woo

2024 Volume 14, Issue 1, Page(s) 6922

Abstract: Von Neumann architecture-based computing, while widely successful in personal computers and embedded systems, faces inherent challenges including the von Neumann bottleneck, particularly amidst the ongoing surge of data-intensive tasks. Neuromorphic ... ...

Abstract	Von Neumann architecture-based computing, while widely successful in personal computers and embedded systems, faces inherent challenges including the von Neumann bottleneck, particularly amidst the ongoing surge of data-intensive tasks. Neuromorphic computing, designed to integrate arithmetic, logic, and memory operations, has emerged as a promising solution for improving energy efficiency and performance. This approach requires the construction of an artificial synaptic device that can simultaneously perform signal processing, learning, and memory operations. We present a photo-synaptic device with 32 analog multi-states by exploiting field-effect transistors based on the lateral heterostructures of two-dimensional (2D) WS
Language	English
Publishing date	2024-03-22
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-57642-6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Effective Transfer Learning with Label-Based Discriminative Feature Learning.

Kim, Gyunyeop / Kang, Sangwoo

Sensors (Basel, Switzerland)

2022 Volume 22, Issue 5

Abstract: The performance of natural language processing with a transfer learning methodology has improved by applying pre-training language models to downstream tasks with a large number of general data. However, because the data used in pre-training are ... ...

Abstract	The performance of natural language processing with a transfer learning methodology has improved by applying pre-training language models to downstream tasks with a large number of general data. However, because the data used in pre-training are irrelevant to the downstream tasks, a problem occurs in that it learns general features rather than those features specific to the downstream tasks. In this paper, a novel learning method is proposed for embedding pre-trained models to learn specific features of such tasks. The proposed method learns the label features of downstream tasks through contrast learning using label embedding and sampled data pairs. To demonstrate the performance of the proposed method, we conducted experiments on sentence classification datasets and evaluated whether the features of the downstream tasks have been learned through a PCA and a clustering of the embeddings.
MeSH term(s)	Cluster Analysis ; Language ; Learning ; Machine Learning ; Natural Language Processing
Language	English
Publishing date	2022-03-04
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s22052025
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Article ; Online: Natural-Language-Driven Multimodal Representation Learning for Audio-Visual Scene-Aware Dialog System.

Heo, Yoonseok / Kang, Sangwoo / Seo, Jungyun

Sensors (Basel, Switzerland)

2023 Volume 23, Issue 18

Abstract: With the development of multimedia systems in wireless environments, the rising need for artificial intelligence is to design a system that can properly communicate with humans with a comprehensive understanding of various types of information in a human- ...

Abstract	With the development of multimedia systems in wireless environments, the rising need for artificial intelligence is to design a system that can properly communicate with humans with a comprehensive understanding of various types of information in a human-like manner. Therefore, this paper addresses an audio-visual scene-aware dialog system that can communicate with users about audio-visual scenes. It is essential to understand not only visual and textual information but also audio information in a comprehensive way. Despite the substantial progress in multimodal representation learning with language and visual modalities, there are still two caveats: ineffective use of auditory information and the lack of interpretability of the deep learning systems' reasoning. To address these issues, we propose a novel audio-visual scene-aware dialog system that utilizes a set of explicit information from each modality as a form of natural language, which can be fused into a language model in a natural way. It leverages a transformer-based decoder to generate a coherent and correct response based on multimodal knowledge in a multitask learning setting. In addition, we also address the way of interpreting the model with a response-driven temporal moment localization method to verify how the system generates the response. The system itself provides the user with the evidence referred to in the system response process as a form of the timestamp of the scene. We show the superiority of the proposed model in all quantitative and qualitative measurements compared to the baseline. In particular, the proposed model achieved robust performance even in environments using all three modalities, including audio. We also conducted extensive experiments to investigate the proposed model. In addition, we obtained state-of-the-art performance in the system response reasoning task.
Language	English
Publishing date	2023-09-14
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s23187875
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Article ; Online: Structural insights into ubiquitin chain cleavage by

Kang, Sangwoo / Kim, Gyuhee / Choi, Minhyeong / Jeong, Minwoo / van der Heden van Noort, Gerbrand J / Roh, Soung-Hun / Shin, Donghyuk

Life science alliance

2023 Volume 6, Issue 7

Abstract: Although ubiquitin is found only in eukaryotes, several pathogenic bacteria and viruses possess proteins that hinder the host ubiquitin system. ...

Abstract	Although ubiquitin is found only in eukaryotes, several pathogenic bacteria and viruses possess proteins that hinder the host ubiquitin system.
MeSH term(s)	Female ; Humans ; Ubiquitin/metabolism ; Polyubiquitin/chemistry ; Polyubiquitin/metabolism ; Legionella/metabolism ; Deubiquitinating Enzymes/genetics ; Deubiquitinating Enzymes/metabolism ; Ovarian Neoplasms/genetics
Chemical Substances	Ubiquitin ; Polyubiquitin (120904-94-1) ; Deubiquitinating Enzymes (EC 3.4.19.12)
Language	English
Publishing date	2023-04-26
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	2575-1077
ISSN (online)	2575-1077
DOI	10.26508/lsa.202201876
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Effect of Measurement System Configuration and Operating Conditions on 2D Material-Based Gas Sensor Sensitivity.

Ryu, Jongwon / Shim, Seob / Song, Jeongin / Park, Jaeseo / Kim, Ha Sul / Lee, Seoung-Ki / Shin, Jae Cheol / Mun, Jihun / Kang, Sang-Woo

Nanomaterials (Basel, Switzerland)

2023 Volume 13, Issue 3

Abstract: Gas sensors applied in real-time detection of toxic gas leakage, air pollution, and respiration patterns require a reliable test platform to evaluate their characteristics, such as sensitivity and detection limits. However, securing reliable ... ...

Abstract	Gas sensors applied in real-time detection of toxic gas leakage, air pollution, and respiration patterns require a reliable test platform to evaluate their characteristics, such as sensitivity and detection limits. However, securing reliable characteristics of a gas sensor is difficult, owing to the structural difference between the gas sensor measurement platform and the difference in measurement methods. This study investigates the effect of measurement conditions and system configurations on the sensitivity of two-dimensional (2D) material-based gas sensors. Herein, we developed a testbed to evaluate the response characteristics of MoS
Language	English
Publishing date	2023-01-31
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano13030573
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Article ; Online: Heteronanostructured Field-Effect Transistors for Enhancing Entropy and Parameter Space in Electrical Unclonable Primitives.

Park, Jaeseo / Leem, Jung Woo / Park, Minji / Kim, Jun Oh / Ku, Zahyun / Chegal, Won / Kang, Sang-Woo / Kim, Young L

ACS nano

2023 Volume 18, Issue 1, Page(s) 1041–1053

Abstract: Hardware security is not a new problem but is ever-growing in consumer and medical domains owing to hyperconnectivity. A physical unclonable function (PUF) offers a promising hardware security solution for cryptographic key generation, identification, ... ...

Abstract	Hardware security is not a new problem but is ever-growing in consumer and medical domains owing to hyperconnectivity. A physical unclonable function (PUF) offers a promising hardware security solution for cryptographic key generation, identification, and authentication. However, electrical PUFs using nanomaterials or two-dimensional (2D) transition metal dichalcogenides (TMDCs) often have limited entropy and parameter space sources, both of which increase the vulnerability to attacks and act as bottlenecks for practical applications. We report an electrical PUF with enhanced entropy as well as parameter space by incorporating 2D TMDC heteronanostructures into field-effect transistors (FETs). Lateral heteronanostructures of 2D molybdenum disulfide and tungsten disulfide serve as a potent entropy source. The variable feature of FETs is further leveraged to enhance the parameter space that provides multiple challenge-response pairs, which are essential for PUFs. This combination results in stably repeatable yet highly variable FET characteristics as alternative electrical PUFs. Comprehensive PUF performance analyses validate the bit uniformity, reproducibility, uniqueness, randomness, false rates, and encoding capacity. The 2D material heteronanostructure-driven electrical PUFs with strong FET-to-FET variability can potentially be augmented as an immediately deployable and scalable security solution for various hardware devices.
Language	English
Publishing date	2023-12-20
Publishing country	United States
Document type	Journal Article
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.3c10308
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Simulational investigation of self-aligned bilayer linear grating enabling highly enhanced responsivity of MWIR InAs/GaSb type-II superlattice (T2SL) photodetector.

Lee, Minseok / Ku, Zahyun / Jeong, Seungjin / Hwang, Jehwan / Lee, Junghyun / Kim, Junoh / Kang, Sang-Woo / Urbas, Augustine / Bae, Hagyoul / Kim, Bongjoong

Scientific reports

2024 Volume 14, Issue 1, Page(s) 2050

Abstract: Linear gratings polarizers provide remarkable potential to customize the polarization properties and tailor device functionality via dimensional tuning of configurations. Here, we extensively investigate the polarization properties of single- and double- ... ...

Abstract	Linear gratings polarizers provide remarkable potential to customize the polarization properties and tailor device functionality via dimensional tuning of configurations. Here, we extensively investigate the polarization properties of single- and double-layer linear grating, mainly focusing on self-aligned bilayer linear grating (SABLG), serving as a wire grid polarizer in the mid-wavelength infrared (MWIR) region. Computational analyses revealed the polarization properties of SABLG, highlighting enhancement in TM transmission and reduction in TE transmission compared to single-layer linear gratings (SLG) due to optical cavity effects. As a result, the extinction ratio is enhanced by approximately 2724-fold in wavelength 3-6 μm. Furthermore, integrating the specially designed SABLG with an MWIR InAs/GaSb Type-II Superlattice (T2SL) photodetector yields a significantly enhanced spectral responsivity. The TM-spectral responsivity of SABLG is enhanced by around twofold than the bare device. The simulation methodology and analytical analysis presented herein provide a versatile route for designing optimized polarimetric structures integrated into infrared imaging devices, offering superior capabilities to resolve linear polarization signatures.
Language	English
Publishing date	2024-01-24
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-52113-4
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Effect of Abiotic Signals on the Accumulation of Saponarin in Barley Leaves in Hydroponics Under Artificial Lights.

Lee, Deuk-Yeong / Kang, Sang-Woo / Kim, Jin-Seong / Bae, Ji-Yeon / Lee, Haeng-Lim / Lee, HanGyeol / Seo, Woo-Duck / Jang, Yu-Sin / Kim, Jin-Hyo

ACS omega

2024 Volume 9, Issue 9, Page(s) 10852–10859

Abstract: Functional flavonoid production is a new agenda in the agricultural industry, and young barley leaves (YBL) are one of the highlighted crops due to their health-beneficial flavonoid, saponarin. For the year-round cultivation of a high saponarin content ... ...

Abstract	Functional flavonoid production is a new agenda in the agricultural industry, and young barley leaves (YBL) are one of the highlighted crops due to their health-beneficial flavonoid, saponarin. For the year-round cultivation of a high saponarin content of YBL, abiotic signal effects on the biosynthesis and metabolism in YBL need to be understood clearly. In this research, the effects of reactive oxygen species (ROS)-related abiotic signals, such as light, potassium, and sodium, were investigated on the biosynthetic metabolism in YBL cultivation under artificial lights. A higher quantity of blue-rich white light (6500 K of light temperature) irradiation enhanced ROS levels and the related enzyme activities (APX and CAT), as well as photosynthesis and saponarin amount, while red-rich white light (3000 K of light temperature) increased the photosynthesis only. In addition, 1.0 g L
Language	English
Publishing date	2024-02-21
Publishing country	United States
Document type	Journal Article
ISSN	2470-1343
ISSN (online)	2470-1343
DOI	10.1021/acsomega.3c09809
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: An Efficient Framework for Development of Task-Oriented Dialog Systems in a Smart Home Environment.

Park, Youngmin / Kang, Sangwoo / Seo, Jungyun

Sensors (Basel, Switzerland)

2018 Volume 18, Issue 5

Abstract: In recent times, with the increasing interest in conversational agents for smart homes, task-oriented dialog systems are being actively researched. However, most of these studies are focused on the individual modules of such a system, and there is an ... ...

Abstract	In recent times, with the increasing interest in conversational agents for smart homes, task-oriented dialog systems are being actively researched. However, most of these studies are focused on the individual modules of such a system, and there is an evident lack of research on a dialog framework that can integrate and manage the entire dialog system. Therefore, in this study, we propose a framework that enables the user to effectively develop an intelligent dialog system. The proposed framework ontologically expresses the knowledge required for the task-oriented dialog system's process and can build a dialog system by editing the dialog knowledge. In addition, the framework provides a module router that can indirectly run externally developed modules. Further, it enables a more intelligent conversation by providing a hierarchical argument structure (HAS) to manage the various argument representations included in natural language sentences. To verify the practicality of the framework, an experiment was conducted in which developers without any previous experience in developing a dialog system developed task-oriented dialog systems using the proposed framework. The experimental results show that even beginner dialog system developers can develop a high-level task-oriented dialog system.
Language	English
Publishing date	2018-05-16
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s18051581
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Article ; Online: Three-dimensional measurement of the course of the radial nerve at the posterior humeral shaft: An in vivo anatomical study.

Park, Ji-Kang / Choi, Seung-Myung / Kang, Sang-Woo / Kim, Kook-Jong / Min, Kyoung-Tae

Journal of orthopaedic surgery (Hong Kong)

2020 Volume 28, Issue 2, Page(s) 2309499020930828

Abstract: Purpose: Iatrogenic radial nerve injury caused by surgical exposure of the humerus is a serious complication. We aimed to describe the course of the radial nerve at the posterior humeral shaft using a three-dimensional (3D) reconstruction technique by ... ...

Abstract	Purpose: Iatrogenic radial nerve injury caused by surgical exposure of the humerus is a serious complication. We aimed to describe the course of the radial nerve at the posterior humeral shaft using a three-dimensional (3D) reconstruction technique by utilizing computed tomography (CT) images of living subjects. We hypothesized that the course of the radial nerve in the posterior aspect of the humeral shaft would be reliably established using this technique and the measurements would have satisfactory intraobserver/interobserver reliabilities. Methods: This in vivo anatomical study utilized 652 upper extremity CT angiography images from 326 patients. A 3D modeling of the humerus and radial nerve was performed. We evaluated the segment of the radial nerve that lays directly on the posterior aspect of the humeral shaft and measured its proximal point, mid, and distal points. The shortest distances from the olecranon fossa to these points were defined as R1, R2, and R3, respectively. The relationships between these parameters and humeral length (HL) and transcondylar length (TL) were evaluated, and the intraobserver/interobserver reliabilities of these parameters were measured. Results: The HL was 293.6 mm, and TL was 58.64 mm on average. The R1 measured 159.2 (range 127.1-198.2) mm, R2 was 136.6 (105.7-182.5), and R3 was 112.8 (76.8-150.0) mm on average ( Conclusion: The course of the radial nerve at the posterior aspect of the humeral shaft can be reliably established using the 3D reconstruction technique, and all measurements had excellent intraobserver/interobserver reliability.
MeSH term(s)	Computed Tomography Angiography/methods ; Female ; Humans ; Humerus/anatomy & histology ; Humerus/diagnostic imaging ; Imaging, Three-Dimensional ; Male ; Middle Aged ; Observer Variation ; Radial Nerve/anatomy & histology ; Radial Nerve/diagnostic imaging ; Reproducibility of Results ; Retrospective Studies ; Sex Factors
Language	English
Publishing date	2020-08-12
Publishing country	England
Document type	Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1493368-8
ISSN	2309-4990 ; 1022-5536
ISSN (online)	2309-4990
ISSN	1022-5536
DOI	10.1177/2309499020930828
Database	MEDical Literature Analysis and Retrieval System OnLINE

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