المؤلفون: Kim, Changhee¹ (AUTHOR) cheeee@khu.ac.kr, Han, Seungju¹ (AUTHOR) sscandidate22@khu.ac.kr, Kim, Taehwan¹ (AUTHOR) djddktl77@khu.ac.kr, Lee, Sangmin² (AUTHOR) sangmlee@khu.ac.kr

المصدر: Sensors (14248220). Feb2024, Vol. 24 Issue 3, p861. 16p.

مصطلحات موضوعية: *SILICON nanowires, *GASTROESOPHAGEAL reflux, *ARTIFICIAL implants, *MEDICAL equipment, *HUMAN body, *NANOLITHOGRAPHY

مستخلص: Silicon nanowires (SiNWs) are emerging as versatile components in the fabrication of sensors for implantable medical devices because of their exceptional electrical, optical, and mechanical properties. This paper presents a novel top-down fabrication method for vertically stacked SiNWs, eliminating the need for wet oxidation, wet etching, and nanolithography. The integration of these SiNWs into body channel communication (BCC) circuits was also explored. The fabricated SiNWs were confirmed to be capable of forming arrays with multiple layers and rows. The SiNW-based pH sensors demonstrated a robust response to pH changes, and when tested with BCC circuits, they showed that it was possible to quantize based on pH when transmitting data through the human body. This study successfully developed a novel method for SiNW fabrication and integration into BCC circuits, which could lead to improvements in the reliability and efficiency of implantable medical sensors. The findings demonstrate significant potential for bioelectronic applications and real-time biochemical monitoring. [ABSTRACT FROM AUTHOR]

المؤلفون: Kim, Un Jeong, Lee, Suyeon, Kim, Hyochul, Roh, Yeongeun, Han, Seungju, Kim, Hojung, Park, Yeonsang, Kim, Seokin, Chung, Myung Jin, Son, Hyungbin, Choo, Hyuck

المصدر: Nature Communications; 9/12/2023, Vol. 14 Issue 1, p1-9, 9p

مصطلحات موضوعية: CONVOLUTIONAL neural networks, IMAGE recognition (Computer vision), SMARTPHONES, SPECTROMETERS, IMAGING systems, RADIANT intensity, IMAGE sensors, CMOS image sensors

مستخلص: Measuring, recording and analyzing spectral information of materials as its unique finger print using a ubiquitous smartphone has been desired by scientists and consumers. We demonstrated it as drug classification by chemical components with smartphone Raman spectrometer. The Raman spectrometer is based on the CMOS image sensor of the smartphone with a periodic array of band pass filters, capturing 2D Raman spectral intensity map, newly defined as spectral barcode in this work. Here we show 11 major components of drugs are classified with high accuracy, 99.0%, with the aid of convolutional neural network (CNN). The beneficial of spectral barcodes is that even brand name of drug is distinguishable and major component of unknown drugs can be identified. Combining spectral barcode with information obtained by red, green and blue (RGB) imaging system or applying image recognition techniques, this inherent property based labeling system will facilitate fundamental research and business opportunities. Smartphones are ubiquitous devices that have permeated into our daily life. Here, the authors demonstrate that a Smartphone Raman spectrometer can be used for drug classification by using a convolutional neural network to process its spectral barcode. [ABSTRACT FROM AUTHOR]

: Copyright of Nature Communications is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Han, Seungju¹ (AUTHOR), Kim, Changhee¹ (AUTHOR), Kim, Kangil¹ (AUTHOR), Lee, Sangmin^1,2 (AUTHOR) sangmlee@khu.ac.kr

المصدر: Technology & Health Care. 2023, Vol. 31 Issue 5, p1981-1995. 15p.

مصطلحات موضوعية: *PROSTHETICS, *MICROELECTRODES, *RETINAL blood vessels, *RETINA, *ELECTRODES

مستخلص: BACKGROUND: In retinal prosthetic systems on multi-channel microelectrodes to effectively stimulate retinal neurons, the electrode-electrolyte interface impedance of a microelectrode should be minimized to drive sufficiently large current at a given supply voltage. OBJECTIVE: This paper presents the fabrication of the nanostructured microelectrode array with simplified fabrication and its characteristic evaluation using biphasic current stimulator. METHODS: The nanostructured microelectrodes with the base diameter of 25 μ m, 50 μ m, 75 μ m are fabricated, and the maximum allowable current injection limits are measured to verify the estimated injection limit. Also, a biphasic stimulator has been fabricated using the 2-stage amplifier and 4 switches based on a stimulator cell. The adjustable load resistance is adopted to control between 5 k Ω to 20 k Ω , and the biphasic stimulator can drive the stimulation current between 50 uA and 200 uA. RESULTS: The proposed electrode-electrolyte interface impedance of the fabricated nanostructured microelectrode is 3178 Ω , 1218 Ω and 798.8 Ω for electrodes with diameter of 25 μ m, 50 μ m, 75 μ m, respectively. CONCLUSION: This paper shows the advantages of the nanostructured microelectrode arrays for high resolution retinal prostheses, which could be a basic experiment for artificial retina research. [ABSTRACT FROM AUTHOR]

المؤلفون: Han, Seungju¹ (AUTHOR), Cho, Hwa Jin^2,3 (AUTHOR), Lee, Bo Lyun⁴ (AUTHOR) bototii@paik.ac.kr, Lee, Keun Soo¹ (AUTHOR) auferstehung@paik.ac.kr

المصدر: Child's Nervous System. Feb2023, Vol. 39 Issue 2, p505-510. 6p.

مصطلحات موضوعية: *FOCAL dystonia, *MAGNETIC resonance imaging, *LITERATURE reviews, *YOUNG adults, *CORPUS callosum, *MOVEMENT disorders, *FRONTAL lobe diseases

مستخلص: Background: Intracranial primary germinomas predominantly develop on or near the midline structure in children and young adults and are diagnosed by brain imaging and biopsy. However, if brain imaging and pathology show unusual findings, it becomes difficult to make an accurate diagnosis. Case report: Herein, we report the case of a 14-year-old boy who presented with focal dystonia of the fingers as an initial symptom. Magnetic resonance imaging of the brain showed multifocal heterogeneous lesions with solid and cystic components involving the right frontal lobe, corpus callosum, left basal ganglia, and left corona radiata. A stereotactic biopsy of the right frontal lesion revealed several granulomatous areas with abundant inflammatory cells. After immunohistochemical staining, the patient was diagnosed with germinoma and treated with chemoradiotherapy according to the Korean Society for Pediatric Neuro-Oncology protocol. The patient has been in complete remission for five years. Conclusion: Germinomas can develop in intracranial off-midline structures, with unusual clinical, radiological, and pathological presentations. It is important to include intracranial germinomas in the differential diagnosis of infiltrative parenchymal tumors, especially in children. [ABSTRACT FROM AUTHOR]

المؤلفون: Song, Sung Eun, Seo, Bo Kyoung, Cho, Kyu Ran, Woo, Ok Hee, Park, Eun Kyung, Cha, Jaehyung, Han, Seungju

المصدر: Cancer Imaging; 4/28/2020, Vol. 20 Issue 1, p1-11, 11p

المؤلفون: Han, Seungju¹, Han, Jae-Joon jae-joon.han@samsung.com, Kim, James D.K.¹, Kim, Changyeong¹

المصدر: Signal Processing: Image Communication. Feb2013, Vol. 28 Issue 2, p97-113. 17p.

مصطلحات موضوعية: *VIRTUAL reality, *MPEG (Video coding standard), *STANDARDIZATION, *INTERNET users, *USER interfaces, *HUMAN facial recognition software

مستخلص: Abstract: Virtual world such as Second life and 3D internet/broadcasting services have been increasingly popular. A life-scale virtual world presentation and the intuitive interaction between the users and the virtual worlds would provide more natural and immersive experience for users. The emergence of novel interaction technologies, such as facial-expression/body-motion tracking and remote interaction for virtual object manipulation, could be used to provide a strong connection between users in the real world and avatars in the virtual world. For the wide acceptance and the use of the virtual world, various types of novel interaction devices should have a unified interaction format between the real world and the virtual world. Thus, MPEG-V Media Context and Control (ISO/IEC 23005) standardizes such connecting information. The paper provides an overview and its usage example of MPEG-V from the real world to the virtual world (R2V) on interfaces for controlling avatars and virtual objects in the virtual world by the real world devices. In particular, we investigate how the MPEG-V framework can be applied for the facial animation and hand-based 3D manipulation using intelligent camera. In addition, in order to intuitively manipulate objects in a 3D virtual environment, we present two interaction techniques using motion sensors such as a two-handed spatial 3D interaction approach and a gesture-based interaction approach. [Copyright &y& Elsevier]

المؤلفون: Han, Seungju¹ han@cnel.ufl.edu, Rao, Sudhir¹ sudhir@cenl.ufl.edu, Erdogmus, Deniz² derdogmus@ieee.org, Jeong, Kyu-Hwa¹ khjeong@cnel.ufl.edu, Principe, Jose¹ principe@cnel.ufl.edu

المصدر: Signal Processing. Nov2007, Vol. 87 Issue 11, p2733-2745. 13p.

مصطلحات موضوعية: *ENTROPY, *THERMODYNAMICS, *SYSTEMS theory, *STANDING waves

مستخلص: Abstract: In this paper, we propose a minimum-error entropy with self-adjusting step -size (MEE-SAS) as an alternative to the minimum-error entropy (MEE) algorithm for training adaptive systems. MEE-SAS has faster speed of convergence as compared to MEE algorithm for the same misadjustment. We attribute the self-adjusting step-size property of MEE-SAS to its changing curvature as opposed to MEE which has a constant curvature. Analysis of the curvature shows that MEE-SAS converges faster in noisy scenarios than noise-free scenario, thus making it more suitable for practical applications as shown in our simulations. Finally, in case of non-stationary environment, MEE-SAS loses its tracking ability due to the “flatness” of the curvature near the optimal solution. We overcome this problem by proposing a switching scheme between MEE and MEE-SAS algorithms for non-stationary scenario, which effectively combines the speed of MEE-SAS when far from the optimal solution with the tracking ability of MEE when near the solution. We demonstrate the performance of the switching algorithm in system identification in non-stationary environment. [Copyright &y& Elsevier]

المؤلفون: Han, Seungju, Park, Joonah

المصدر: 2014 IEEE International Conference on Consumer Electronics (ICCE); 2014, p512-513, 2p

المؤلفون: Han, Seungju, Park, Joonah

المصدر: 2013 IEEE International Conference on Consumer Electronics (ICCE); 2013, p600-601, 2p

المؤلفون: Hoang, Danh-Tai, Prasanna Venkatesh, B., Han, Seungju, Jo, Junghyo, Watanabe, Gentaro, Choi, Mahn-Soo

المصدر: Scientific Reports; 6/10/2016, p27603, 1p