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Hyo Jeong Kim1,2,Jun Hyuek Yang,Hyun Soo Kim,Yeo Jin Kim,Wonhee Jang,Young Rok Seo,W. Jang,Y. R. Seo 대한독성 유전단백체 학회 2017 Molecular & cellular toxicology Vol.13 No.1
I ntensive usage of electronic appliances containing lithium batteries causes an accumulation of e-trash. Environmental exposure to lithium batteries contaminates ecosystems. In air and water, the batteries form lithium hydroxide (LiOH) on their surfaces. LiOH enters the aquatic environment and contaminates the aquatic ecosystem by being absorbed into biological organisms. In this study, in order to identify meaningful potential biomarkers that appear in response to lithium, we measured significantly up- and down-regulated genes after LiOH exposure by conducting a microarray. In addition, we explored the functions of differentially expressed daphnia genes, and we conducted a comparative analysis in other species, Daphnia spp. to humans, then analyzed the signaling pathways using the human gene set derived from daphnia sequences that are differentially expressed in response to LiOH using the NCBI-BLAST tool and Pathway studio. As a result, we identified signaling pathways and suggested several potential biomarkers that are up- or down-regulated in response to lithium. This study may contribute to the development of a biomonitoring system which can detect the ecotoxicity of lithium. Furthermore, lithium toxicity in humans can be predicted, so the study may also provide potential biomarkers of lithium exposure in humans.
The compilation of Inventory of National Biological Resources with 111 Alert Alien Species in Korea
Soen-Yi Kim,Jin-Whoa Yum,Neung-Ho Ahn,Hye-Woo Byun,Mi-Jeong Jeon,Sung-Hee Jung,Hyun-Ki Choi,Youn-Bong Ku,Eun-Joo Woo,Min-Ha Kim,Wonhee Kim,Byung-Jik Kim,Hwa-Jung Kim,Min-Seock Do,Chang-Mu Kim 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.04
Wonhee Kim,Chung Choo Chung 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Global output tracking and rejection of multi biased sinusoidal disturbances with unknown frequencies for nonlinear systems is considered. Disturbance observers (DOBs) in the form of a high pass filter are proposed to estimate multiple biased sinusoidal disturbances with unknown frequencies. The nonlinear control method is designed to compensate the estimation errors of the disturbances and guarantee the global output tracking. The matching conditions is no significant in the proposed method. The proposed method imposes no restriction on the number of disturbances, and no restriction such as biased sinusoidal signals. Therefore, the complete rejection of multi sinusoidal disturbance with stabilization can be achieved by the proposed method.
An updated list of mosses of Korea
Kim, Wonhee,Higuchi, Masanobu,Yamaguchi, Tomio The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4
Cardot(1904) first reported 98 Korean mosses, which were collected from Busan, Gangwon Province, Mokpo, Seoul, Wonsan and Pyongyang by Father Faurie in 1901. Thirty-four of these species were new species to the world. However, eight of these species have been not listed to the moss checklist of Korea before this study. Thus, this study complies the literature including Korean mosses, and lists all the species there. As the result, the moss list of Korea is updated as including 775 taxa (728 species, 7 subspecies, 38 varieties, 2 forma) arranged into 56 families and 250 genera. This list include species that have been newly recorded since 1980. Brachythecium is the largest genus in Korea, and Fissidens, Sphagnum, Dicranum and Entodon are relatively large. Additionally, this study cites specimens collected from Jeju Island, Samcheok, Gangwon Province, and Socheong Island, and it is possible to confirm the distribution of 338 species in Korea.
Microstepping with PI Feedback and Feedforward for Permanent Magnet Stepper Motors
Wonhee Kim,Induk Choi,Chung Choo Chung 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, the stability of microstepping is investigated via Lyapunov method. Microstepping with proportional integral (PI) feedback and feedforward is proposed for the position tracking of a Permanent Magnet (PM) stepper motor. Given static inputs to the two phase PM stepper motor, it is proven that the stability of equilibrium points is guaranteed by LaSalle’s theorem. For position tracking, the relationships between the voltage input and current output of each phase for the position tracking are derived. From the relationships, microstepping with PI feedback and feedforward is developed for the position tracking. Experimental result shows that the position tracking performance of the proposed controller is improved compared to conventional microstepping.
High Order Extended Observer Based Output Feedback Control for Unknown Nonlinear Systems
Wonhee Kim,Chung Choo Chung 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
We propose a robust output feedback control to guarantee the semi-global uniform ultimate boundedness of the output tracking error using only output feedback for unknown nonlinear systems with external disturbance. The key idea of the proposed method is that the plant nonlinearities and external disturbance, and theirs derivatives are lumped into extended state variables. The high order extended observer (HOEOB) is developed to estimate the lumped extended state variables and full state. The benefit to using the HOEOB is that the estimation error can be reduced without increasing the bandwidth of the HOEOB. The backstepping controller is designed to guarantee the semi-global uniform ultimate boundedness of the output tracking error occurred by the disturbance estimation error. The performance of the proposed method is studied in both time and frequency domains. The effect of measurement noise to the estimation performance is also studied in the frequency domain. It is proven that very small estimation error is not necessarily required to obtain the precise output tracking using input-to-state stability (ISS) property.
Wonhee Kim,Choong Woo Lee,Jong-Shik Baek,Chung Choo Chung,Tomizuka, Masayoshi IEEE 2014 IEEE/ASME transactions on mechatronics Vol.19 No.4
<P>In this paper, a nonlinear controller with dead-zone and saturation is proposed in order to improve the antishock performance. Since using dead-zone and saturation improves the stability margin, we can use a higher gain for the dead-zone than in the previous methods. In addition, we find that the overall controller with a linear lead-lag controller has an improved stability margin over controllers with the PID linear control in this application. The experimental results confirmed that the proposed method provides improved protection against external shock.</P>
Vehicle Path Prediction Using Yaw Acceleration for Adaptive Cruise Control
Kim, Wonhee,Kang, Chang Mook,Son, Young Seop,Lee, Seung-Hi,Chung, Chung Choo IEEE 2018 IEEE transactions on intelligent transportation sy Vol.19 No.12
<P>In this paper, we propose a vehicle path prediction employing yaw acceleration for adaptive cruise control (ACC). First, a path prediction method employing yaw acceleration is proposed to improve the path prediction performance of ego vehicles. In the proposed method, the vehicle path is predicted by using a clothoidal cubic polynomial curve model, and for this purpose, the curvature rate, yaw rate, and longitudinal velocity are required. The curvature rate can be mathematically obtained by differentiating the yaw rate without a camera sensor. To obtain the yaw acceleration from the noisy measured yaw rate, we derive the state-space model from the steer wheel angle for the yaw rate. Then, the KF is designed by using the state-space model to estimate the yaw acceleration. Second, a multirate longitudinal control method is proposed to improve the longitudinal control performance. The multirate KF employs the constant acceleration model in order to estimate the relative distance and velocity of the target vehicle at a faster sampling rate. Then, the desired acceleration is achieved to maintain a safe headway distance or velocity by means of the longitudinal controller. Consequently, the whole ACC system operates with a faster sampling rate so that multirate control scheme reduces ripples in both the relative longitudinal distance and the desired acceleration. The performance of the proposed method was evaluated via simulations and experiments.</P>
Wonhee Kim,Jongpyo Han,Induk Choi,Chung Choo Chung 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, iterative learning control (ILC) with field oriented control is proposed to reject periodic velocity ripple which are casually detent torque and other various sources in permanent magnet stepper motor(PMSM). Singleinput single-output (SISO) system structure with field-oriented control (FOC) is proposed to be applied to ILC. To make the error convergence fast, current error based ILC using plant inversion method is designed. The condition that error converges to zero is derived. Simulation results show that the velocity ripple is cut in by using ILC.