http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Kim, Wonhee,Son, Young Seop,Chung, Chung Choo IEEE 2016 IEEE Transactions on Vehicular Technology VT Vol.65 No.6
<P>We propose a torque-overlay-based robust steering wheel angle ( SWA) control method of electrical power steering ( EPS) for a lane-keeping system of automated vehicles. The proposed method consists of an augmented observer and a nonlinear damping controller to guarantee the semiglobal uniform ultimate boundedness of the SWA tracking error using only SWA feedback. The key idea of the proposed method is that the system functions with unknown parameters and external disturbance, along with their derivatives, are combined into an augmented state variable for designing the nonlinear observer in the absence of Lipschitz conditions. The augmented observer is designed to estimate the full state and disturbance. The nonlinear damping controller is developed via backstepping to suppress the angle tracking error using the input-to-state stability property when the estimation error becomes large. Since the proposed method is designed based on torque overlay, a torque integration using basic functions of the EPS for SWA control is available for driver convenience. Furthermore, no modification of the EPS is required. The performance of the proposed method was validated through experimentation with a test vehicle.</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>
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.
Passivity based Nonlinear controller for Position Tracking Control of Electro-Hydraulic Servo System
Wonhee Kim(김원희),Jongpyo Han(한종표),Indeok Choi(최인덕),Daehee Won(원대희),Chung Choo Chung(정정주) 제어로봇시스템학회 2008 제어로봇시스템학회 국내학술대회 논문집 Vol.2008 No.10
This paper presents a passivity controller for position control of electro-hydraulic servo system. Passivity based controller was designed to consider 5th order state space model of the hydraulic actuator which has a second order servo valve dynamics. Simulation results showed that position tracking performance of proposed controller is effective by bandwidth, step response, and path tracking test.
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>
Kim, Min Sup,Jun, Indong,Shin, Young Min,Jang, Wonhee,Kim, Sun I.,Shin, Heungsoo WILEY-VCH Verlag 2010 Macromolecular bioscience Vol.10 No.1
<P>Composite nanofibers of poly(caprolactone) (PCL) and gelatin crosslinked with genipin are prepared. The contact angles and mechanical properties of crosslinked PCL-gelatin nanofibers decrease as the gelatin content increases. The proliferation of myoblasts is higher in the crosslinked PCL-gelatin nanofibers than in the PCL nanofibers, and the formation of myotubes is only observed on the crosslinked PCL-gelatin nanofibers. The expression level of myogenin, myosin heavy chain, and troponin T genes is increased as the gelatin content is increased. The results suggest that PCL-gelatin nanofibers crosslinked with genipin can be used as a substrate to modulate proliferation and differentiation of myoblasts, presenting potential applications in muscle tissue engineering.</P><P> <img src='wiley_img/16165187-2010-10-1-MABI200900168-gra001.gif' alt='wiley_img/16165187-2010-10-1-MABI200900168-gra001'> </P> <B>Graphic Abstract</B> <P>Poly(caprolactone) (PCL)-gelatin nanofibers crosslinked with genipin are developed, and their morphological and physical properties are investigated. The effect of gelatin on the cultured myoblasts are also investigated. The proliferation and differentiation of myoblasts are controlled by the increase in the gelatin content, suggesting that the nanofibers can be used as a substrate for engineering muscle tissue. <img src='wiley_img/16165187-2010-10-1-MABI200900168-content.gif' alt='wiley_img/16165187-2010-10-1-MABI200900168-content'> </P>