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Hongkeun Kim,Ji-Wook Kwon,Bong Seok Park 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper studies the design problem of a controller to achieve a consensus of a group of N identical and high-order linear systems that possibly have non-uniform ranks but do not have finite zeros. The local interactions among the N systems are modeled by a switching graph that ranges over a finite set of connected and undirected graphs and has a non-vanishing dwell time. Under these conditions, we propose a controller for the consensus of the N systems which uses only relative output measurements from the neighboring systems for the purpose of feedback.
Kim, Hongkeun,Kwon, Ji-Wook,Park, Bong Seok 제어로봇시스템학회 2014 Transaction on control, automation and systems eng Vol.12 No.4
This paper studies the design problem of a controller to achieve an asymptotic consensus for a class of non-uniform rank linear systems. The interconnection topology for the N non-uniform rank systems is assumed to be modeled by a time-varying graph that switches in a finite set of connected and undirected graphs and has a non-vanishing dwell time. Under these conditions, we propose a controller for the asymptotic consensus of the N systems and provide a closed formula for an agreed trajectory that in fact indicates the attainment of average consensus. The controller is implemented through the backstepping and high-gain observer techniques, and uses only relative output measurements from the neighboring systems for the purpose of feedback. The idea behind this implementation is that the output feedback controller implemented in this way can make the norm of the state of the closed-loop system arbitrary small within any given dwell time, even for non-uniform rank systems.
Neural network-based output feedback control for reference tracking of underactuated surface vessels
Park, Bong Seok,Kwon, Ji-Wook,Kim, Hongkeun Elsevier 2017 Automatica Vol.77 No.-
<P><B>Abstract</B></P> <P>This paper proposes an adaptive output feedback control for trajectory tracking of underactuated surface vessels (USVs). For the realistic dynamical model of USVs, we consider the USV model, where the mass and damping matrices are not diagonal. Moreover, except the mass matrix, the system parameters and nonlinearities of the USV are all assumed to be unknown. Despite this uncertain circumstance, we develop an adaptive observer based on the neural networks to estimate the velocity data of USVs. Then, an output feedback control law is designed by simultaneously considering the input saturation and underactuated problems.</P>
고순도로 합성된 나노콜로이드 티타늄옥사이드의 BN 파우더 코팅에 관한 연구
장혜인 ( Hyein Jang ),이경철 ( Kyungchul Lee ),홍성호 ( Sungho Hong ),지홍근 ( Hongkeun Ji ),이승화 대한화장품학회 2002 대한화장품학회지 Vol.28 No.1
High concentrated TiO<sub>2</sub> nano colloids were synthesized by sol-gel method. Reactions were performed in TiCI<sub>4</sub>/HCI/H<sub>2</sub>O aqueous solution and the conditions of particles such as shape, size and aggregation, etc. were controlled by polymerization and adsorption of acrylamide in surface of TiO<sub>2</sub> nano particles. And also, aminopropyltriethoxysilane was added instead of acrylamide and compared each other. The prepared colloids were well dispersed and showed the strong absorption peaks at 350nm-370nm which is blue shifted to 20-30nm, compared to macro particles. The obtained techniques from TiO<sub>2</sub> nano colloids synthesis were utilized in coating on boron nitride powders which are nonpolar and isoelectronic materials of carbon. Their surface morphology, structure, thermal stability and U.V absorption characteristics were examined by SEM(Scanning Electron Microscopy), XRD(X-ray diffraction), TG/DTA(Thermogravimetric and Differential Thermal Analysis), UV-VIS(Ultraviolet- Visible Spectroscopy).corresponding auther(e-mail:shlee6914@hanmail.net)
Jang, Yangsoo,Lee, Jong Ho,Chae, Jey Sook,Kim, Oh Yoen,Koh, Soo Jeong,Kim, Ji Young,Cho, Hongkeun,Lee, Jong Eun,Ordovas, Jose M Oxford University Press 2005 The American journal of clinical nutrition Vol.82 No.4
<P>BACKGROUND: The adiponectin gene is known to modulate adiponectin concentrations and diabetes mellitus development. OBJECTIVE: We assessed whether adiponectin gene variants contribute to circulating adiponectin, insulin resistance (IR), or cardiovascular disease risk factors. DESIGN: Nondiabetic subjects [n = 902; x +/- SE age: 42.5 +/- 0.53 y; body mass index (BMI; in kg/m2): 24.7 +/- 0.11] were genotyped for 2 single-nucleotide polymorphisms (SNPs), 45T-->G and 276G-->T. RESULTS: After adjustment for age, sex, and BMI, subjects with the G allele for the SNP 276 had significantly higher concentrations of triacylglycerol and small dense LDL (sdLDL) and smaller LDL particle size than did T/T subjects. G/G subjects at SNP 276 had significantly lower plasma adiponectin and higher homeostasis model assessment (HOMA) of IR and urinary prostaglandin F2alpha than did T/T subjects. In the SNP 45-276 haplotype test, we also observed that subjects with the X/X haplotype had significantly higher plasma adiponectin after adjustment than did TG/TG or TG/X haplotype subjects. In the highest BMI group (BMI > or = 26), T/T subjects had lower HOMA-IR (P = 0.011) and higher plasma adiponectin (P = 0.026) at SNP 276 than did G/G or G/T subjects. These patterns were also seen for adiponectin in haplotype groups. However, no significant genotype effect for SNP 45T-->G was observed. CONCLUSIONS: The 276G-->T polymorphism of the adiponectin gene modulates circulating adiponectin and IR, particularly in obese states. G allele carriers also have higher oxidative stress, higher sdLDL concentrations, and smaller LDL particle size. Therefore, the presence of the G allele in the adiponectin gene at SNP 276 could be a significant contributor to higher cardiovascular disease risk in Koreans, independent of common environmental factors.</P>