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35 results on '"Seong, Woo-Kyeong"'

9. Dysarthric Speech Recognition Error Correction Using Weighted Finite State Transducers Based on Context–Dependent Pronunciation Variation

Author

Seong, Woo Kyeong, Park, Ji Hun, Kim, Hong Kook, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Miesenberger, Klaus, editor, Karshmer, Arthur, editor, Penaz, Petr, editor, and Zagler, Wolfgang, editor

Published
2012
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11. Heater-Integrated Flexible Piezoresistive Pressure Sensor Array for Smart-Car Seats

Author

Park, Yangkyu, Gwon, Na-Hyeon, Seong, Woo-Kyeong, and Kim, Wonhyo

Abstract

With the growing popularity of autonomous vehicles, the need for real-time monitoring of occupant posture has led to the requirement for a pressure sensor array. Moreover, heated car seats not only offer drivers comfort but also prevent cramped postures, allowing pressure sensors to accurately measure drivers’ pressure distribution and enhance safety in autonomous driving. Herein, we propose a heater-integrated pressure sensor array designed specifically for seats in a commercially available GV80 car. The unique signal lines in our sensor enable the implementation of both sensing and heating functionalities within a single substrate, streamlining the fabrication process for the heater-integrated sensor. The sensor was characterized in terms of sensitivity, linearity, response time, repeatability, hysteresis, body temperature effect, and pressure interference among sensing elements. Our sensor exhibited a wide linearity region of 17.06 kPa with a maximum linearity error of 4.4% and a fast response time of less than 4 ms. It operated reliably with a maximum relative standard deviation (RSD) of 5.2% and a hysteresis error of 12.2%. The maximum resistance difference affected by the body temperature was as small as 8.5%, and the resistance changes of one sensing element were almost constant, regardless of the pressure applied to the other sensing element. Additionally, we studied the variations in sensor characteristics with respect to heater temperatures. Furthermore, we customized the embedded system and graphical user interface (GUI) to demonstrate sensor responses according to five different postures. Thus, our heater-integrated sensor shows promise as a potential device for emerging smart-car seats.

Published
2024
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23. Quantitative measurements of C-reactive protein using silicon nanowire arrays

Author

Lee,Min-Ho, Lee,Kuk-Nyung, Jung,Suk-Won, Kim,Won-Hyo, Shin,Kyu-Sik, Seong,Woo-Kyeong, Lee,Min-Ho, Lee,Kuk-Nyung, Jung,Suk-Won, Kim,Won-Hyo, Shin,Kyu-Sik, and Seong,Woo-Kyeong

Abstract

Min-Ho Lee, Kuk-Nyung Lee, Suk-Won Jung, Won-Hyo Kim, Kyu-Sik Shin, Woo-Kyeong SeongKorea Electronics Technology Institute, Gyeonggi, KoreaAbstract: A silicon nanowire-based sensor for biological application showed highly desirable electrical responses to either pH changes or receptor-ligand interactions such as protein disease markers, viruses, and DNA hybridization. Furthermore, because the silicon nanowire can display results in real-time, it may possess superior characteristics for biosensing than those demonstrated in previously studied methods. However, despite its promising potential and advantages, certain process-related limitations of the device, due to its size and material characteristics, need to be addressed. In this article, we suggest possible solutions. We fabricated silicon nanowire using a top-down and low cost micromachining method, and evaluate the sensing of molecules after transfer and surface modifications. Our newly designed method can be used to attach highly ordered nanowires to various substrates, to form a nanowire array device, which needs to follow a series of repetitive steps in conventional fabrication technology based on a vapor-liquid-solid (VLS) method. For evaluation, we demonstrated that our newly fabricated silicon nanowire arrays could detect pH changes as well as streptavidin-biotin binding events. As well as the initial proof-of-principle studies, C-reactive protein binding was measured: electrical signals were changed in a linear fashion with the concentration (1 fM to 1 nM) in PBS containing 1.37 mM of salts. Finally, to address the effects of Debye length, silicon nanowires coupled with antigen proteins underwent electrical signal changes as the salt concentration changed.Keywords: silicon nanowire array, C-reactive protein, vapor-liquid-solid method

Published
2008

34. Synthesis of BaTiO3 fine powders and determination of the critical size of the tetragonal crystal

Author

Yoon, Jong Tae, Seong, Woo Kyeong, Park, Hyun Min, Kim, Han Gyun, Park, Bong Mo, and Chung, Su Jin

Abstract

BaTiO3 fine powders were hydrothermally synthesized. The maximal size of cubic crystallite at room temperature was estimated by comparision of the size distributions on TEM and the x-ray powder diffraction intensities of the synthesized powders. The volume fraction of tetragonal powder in a batch was calculated from the x-ray diffraction pattern by the peak profile fitting method and the size distribution was counted on TEM micrographs of the powder. The critical size between cubic and tetragonal BaTiO3 powder at room temperature was calculated as 0.23μmlm

Published
1997
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35. Measurement of urinary N-telopeptides and serum C-telopeptides from type I collagen using a lateral flow-based immunoassay.

Author

Lee KM, Lee MH, Chung CY, Seong WK, Lee SD, and Park MS

Subjects
Aged, Animals, Demography, Enzyme-Linked Immunosorbent Assay, Female, Humans, Immune Sera metabolism, Male, Mice, Mice, Inbred BALB C, Collagen Type I blood, Collagen Type I urine, Immunoassay methods, Peptides blood, Peptides urine, Rheology
Abstract

Measuring bone turnover markers could detect early stages of osteoporosis and early responses to anti-osteoporotic treatments. Currently, commonly used bone turnover markers, N-telopeptides (NTx) and C-telopeptides (CTx), are measured using ELISA tests, which demands time and increases cost. Bone turnover markers need to be measured more easily for general use. Lateral flow-based immunoassay would be an appropriate method for this context. This study was performed to investigate the precision of a newly developed lateral flow-based immunoassay for measuring the urinary NTx and serum CTx, and their correlations with ELISA measurements. Urine NTx and serum CTx concentrations were determined by photoscan of newly developed strips, using a lateral flow-based immunoassay for 36 subjects (mean age 66.2 years, SD 7.5 years; four males and 32 females). Repeated measurement of urinary NTx and serum CTx were performed three times, using this technology for a precision test. The correlation of the lateral flow-based immunoassay with the ELISA measurements was analyzed. Precision of the newly developed lateral flow based immunoassay was 0.974 (ICC, 95% confidence interval, 0.955 to 0.986) and 0.995 (ICC, 95% confidence interval, 0.991 to 0.997) for urinary NTx and serum CTx, respectively. The correlation of lateral flow based immunoassay with ELISA was 0.913 for urinary NTx and 0.872 for serum CTx. These results suggest that measuring the urinary NTx and serum CTx, using a lateral flow-based immunoassay, is a relevant method for point-of-care testing and screening of bone resorption markers.

Published
2012
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