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정순택,문길만,조건식,강성국,김설희 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-
The effect of chitosan in soybean koji preparation and characteristics of chitosan-koji were investigated. Aspergillus oryzae KCTC 6096 and Aspergillus kawachii KCCM 11458 was used for koji preparation. a-Amylase activity of soybean koji prepared with 0.25% 10cp chitosan was excellent relative to 30 cp chitosan and 1.6 times higher than non-added soybean koji. Acid and neutral protease activities of soybean koji prepared with 0.25%, 10 cp chitosan were showed simillary higher value than non-chitosna added koji. The period of koji preperation was reduced 30% by adding chitosan.
Photoresponse of n-ZnO/p-Si photodiodes to violet-green bandwidth light caused by defect states
Cho, Seong Gook,Lee, Dong Uk,Kim, Eun Kyu Elsevier 2013 THIN SOLID FILMS - Vol.545 No.-
<P><B>Abstract</B></P> <P>We fabricated n-ZnO/p-Si photodiodes by ultra-high vacuum sputtering that were highly responsive to violet-green light illumination at low operating voltages. Under illumination with light at 420nm, the maximum photoresponsivity of the photodiodes was about 0.55A/W at −8V. As the ZnO film thickness increased from 150nm to 500nm, the photoresponsivity of the diodes to the wavelength range of 370–560nm increased markedly, while the absorption bandwidth decreased. In particular, a slow photo-response was observed under light between the wavelengths of 540–560nm. We speculate that the high photoresponsivity and slow photoresponse of the synthesized diodes are due to shallow and deep acceptor states originating from zinc vacancy defects in the ZnO thin film, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> n-ZnO/p-Si showed high photoresponse under violet-green lights at low voltages. </LI> <LI> Photoresponsivity of n-ZnO/p-Si photodiodes was reaching up to 0.55A/W at −8V. </LI> <LI> Zinc vacancy affects the photoresponsivity in the 370–560nm wavelength range. </LI> <LI> Slow photoresponse was observed under the light with wavelengths of 540–560nm. </LI> </UL> </P>
Cho, Seong Yun,Ju, Ho Jin,Park, Chan Gook,Cho, Hyeonjin,Hwang, Junho The Institute of Positioning 2017 Journal of Positioning, Navigation, and Timing Vol.6 No.4
In this paper, a simplified Cubature Kalman Filter (SCKF) is proposed to reduce the computation load of CKF, which is then used as a filter for transfer alignment of shipboard INS. CKF is an approximate Bayesian filter that can be applied to non-linear systems. When an initial estimation error is large, convergence characteristic of the CKF is more stable than that of the Extended Kalman Filter (EKF), and the reliability of the filter operation is more ensured than that of the Unscented Kalman Filter (UKF). However, when a system degree is large, the computation amount of CKF is also increased significantly, becoming a burden on real-time implementation in embedded systems. A simplified CKF is proposed to address this problem. This filter is applied to shipboard inertial navigation system (INS) transfer alignment. In the filter design for transfer alignment, measurement type and measurement update rate should be determined first, and if an application target is a ship, lever-arm problem, flexure of the hull, and asynchronous time problem between Master Inertial Navigation System (MINS) and Slave Inertial Navigation System (SINS) should be taken into consideration. In this paper, a transfer alignment filter based on SCKF is designed by considering these problems, and its performance is validated based on simulations.
MEMS Based Pedestrian Navigation System
Cho, Seong Yun,Park, Chan Gook Royal Institute of Navigation 2006 The Journal of navigation Vol.59 No.1
<P>In this paper we present a micro-electrical mechanical system (MEMS) based pedestrian navigation system (PNS) for seamless positioning. The sub-algorithms for the PNS are developed and the positioning performance is enhanced using the modified receding horizon Kalman finite impulse response filter (MRHKF). The PNS consists of a biaxial accelerometer and a biaxial magnetic compass mounted on a shoe. The PNS detects a step using a novel technique during the stance phase and simultaneously calculates walking information. Step length is estimated using a neural network whose inputs are the walking information. The azimuth is calculated using the magnetic compass, the walking information and the tilt compensation algorithm. Using the proposed sub-algorithms, seamless positioning can be accomplished. However, the magnetic compass based azimuth may have an error that varies according to the surrounding magnetic field. In this paper, the varying error is compensated using the MRHKF filter. Finally, the performance enhanced seamless positioning is achieved, and the performance is verified by experiment.</P>
Cho, Seong-Jae,Kim, Hyung-Jin,Sun, Min-Chul,Park, Byung-Gook,Harris, James S. Jr. The Institute of Electronics and Information Engin 2012 Journal of semiconductor technology and science Vol.12 No.3
In this work, design considerations for high-performance silicon photodetector are thoroughly investi- gated. Besides the critical dimensions of device, guidelines for process architecture are suggested. Abiding by those criteria for improving both direct-current (DC) and alternating-current (AC) perfor- mances, a high-speed low-operation power silicon photodetector based on p-i-n structure for optical interconnect has been designed by device simulation. An $f_{-3dB}$ of 80 GHz at an operating voltage of 1 V was obtained.
Cho, Seong-Jae,Sun, Min-Chul,Kim, Ga-Ram,Kamins, Theodore I.,Park, Byung-Gook,Harris, James S. Jr. The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.3
In this work, a tunneling field-effect transistor (TFET) based on heterojunctions of compound and Group IV semiconductors is introduced and simulated. TFETs based on either silicon or compound semiconductors have been intensively researched due to their merits of robustness against short channel effects (SCEs) and excellent subthreshold swing (SS) characteristics. However, silicon TFETs have the drawback of low on-current and compound ones are difficult to integrate with silicon CMOS circuits. In order to combine the high tunneling efficiency of narrow bandgap material TFETs and the high mobility of III-V TFETs, a Type-I heterojunction tunneling field-effect transistor (I-HTFET) adopting $Ge-Al_xGa_{1-x}As-Ge$ system has been optimized by simulation in terms of aluminum (Al) composition. To maximize device performance, we considered a nanowire structure, and it was shown that high performance (HP) logic technology can be achieved by the proposed device. The optimum Al composition turned out to be around 20% (x=0.2).
Altitude and Heading Correction of 3D Pedestrian Inertial Navigation
Cho, Seong Yun,Lee, Jae Hong,Park, Chan Gook 항법시스템학회 2021 Journal of Positioning, Navigation, and Timing Vol.10 No.3
In this paper, we propose techniques to correct the altitude error and heading error of 3D Pedestrian Inertial Navigation (PIN). When a PIN is used to estimate the location of a pedestrian only with an Inetrial Measurement Unit (IMU) without infrastructure, there is a problem in that the location error gradually increases due to the limitation of the observability of the filter. To solve this problem without additional sensors, we propose two techniques in this paper. First, stair walking is recognized in consideration of the altitude difference that may occur during one step. If it is recognized as stair walking, only Zero-velocity UPdaTe (ZUPT) is performed, and if it is recognized as level walking, ZUPT + Altitude Damping (AD) is performed together to correct the altitude error. Second, the straight-line movement direction is calculated through the difference of the estimated position, and the heading error is corrected by matching this information with the link information of the digital map. By applying these techniques, it is verified through real tests that accurate three-dimensional location information of pedestrians can be estimated without infrastructure.
Cho, Sung-Gook,Go, Ho Yeon,Park, Jeong-Su,Jung, Ki-Yong,Sun, Seung-Ho,Choi, You-Kyung,Song, Yun-Kyung,Park, Jong-Hyeong,Jun, Chan-Yong,Ko, Seong Gyu Hindawi Publishing Corporation 2014 Evidence-based Complementary and Alternative Medic Vol.2014 No.-
<P>Herbal prescription, Danggui-Sayuk-Ga-Osuyu-Saenggang-tang (DSGOST), has long been used to treat Raynaud's phenomenon (RP) in traditional Chinese medicine (TCM). However, a biological mechanism by which DSGOST ameliorates RP is yet deciphered. In this study, we demonstrate that DSGOST inhibits cold-induced activation of RhoA, in both vascular smooth muscle cells (VSMC) and endothelial cells (EC), and blocks endothelin-1-mediated paracrine path for cold response on vessels. While cold induced RhoA activity in both cell types, DSGOST pretreatment prevented cold-induced RhoA activation. DSGOST inhibition of cold-induced RhoA activation further blocked <I><I>α</I></I>2c-adrenoreceptor translocation to the plasma membrane in VSMC. In addition, DSGOST inhibited endothelin-1-mediated RhoA activation and <I><I>α</I></I>2c-adrenoreceptor translocation in VSMC. Meanwhile, DSGOST inhibited cold-induced or RhoA-dependent phosphorylation of FAK, SRC, and ERK. Consistently, DSGOST inhibited cold-induced endothelin-1 expression in EC. Therefore, DSGOST prevents cold-induced RhoA in EC and blocks endothelin-1-mediated paracrine path between EC and VSMC. In conclusion, our data suggest that DSGOST is beneficial for treating RP-like syndrome.</P>