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Corrosion behavior and creepage discharze character for machinable AlN/h-BN ceramic composites
Hai-yun Jin,Bo He,Nai-kui Gao,Zong-ren Peng,Ji-qiang Gao 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
AlN particles coated with nano-BN were synthesized. The AlN/BN ceramic composites were sintered by Plasma Active Sintering (PAS). Because the nano-BN crystals were homogeneously dispersed around the AlN grains of the matrix, the chemical corrosion resistance of AlN/nano-sized h-BN ceramic composites was higher than that of AlN/micro-sized h-BN ceramic composites and monolithic AlN ceramics. Due to the better hydrophobic property of h-BN, the AlN/BN composites had a better hydrophobic property than the monolithic AlN ceramic, at the same time, because of the homogeneous dispersion of the nano-BN, the creepage discharze voltage of AlN/nano-sized BN composites was the highest. AlN particles coated with nano-BN were synthesized. The AlN/BN ceramic composites were sintered by Plasma Active Sintering (PAS). Because the nano-BN crystals were homogeneously dispersed around the AlN grains of the matrix, the chemical corrosion resistance of AlN/nano-sized h-BN ceramic composites was higher than that of AlN/micro-sized h-BN ceramic composites and monolithic AlN ceramics. Due to the better hydrophobic property of h-BN, the AlN/BN composites had a better hydrophobic property than the monolithic AlN ceramic, at the same time, because of the homogeneous dispersion of the nano-BN, the creepage discharze voltage of AlN/nano-sized BN composites was the highest.
Park, Ji Hoon,Lee, Bo Keun,Park, Seung Hun,Kim, Mal Geum,Lee, Jin Woo,Lee, Hye Yun,Lee, Hai Bang,Kim, Jae Ho,Kim, Moon Suk MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.3
<P>To develop a biodegradable polymer possessing elasticity and flexibility, we synthesized MPEG-b-(PCL-<I>co</I>-PLA) copolymers (PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A), which display specific rates of flexibility and elasticity. We synthesize the PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A copolymers by ring-opening polymerization of ε-caprolactone and <SMALL>L</SMALL>-lactide. PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A copolymers of various compositions were synthesized with 500,000 molecular weight. The PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A copolymers mechanical properties were dependent on the mole ratio of the ε-caprolactone and <SMALL>L</SMALL>-lactide components. Cyclic tensile tests were carried out to investigate the resistance to creep of PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A specimens after up to 20 deformation cycles to 50% elongation. After in vivo implantation, the PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A implants exhibited biocompatibility, and gradually biodegraded over an eight-week experimental period. Immunohistochemical characterization showed that the PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A implants provoked in vivo inflammation, which gradually decreased over time. The copolymer was used as a drug carrier for locally implantable drugs, the hydrophobic drug dexamethasone (Dex), and the water-soluble drug dexamethasone 21-phosphate disodium salt (Dex(p)). We monitored drug-loaded PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A films for in vitro and in vivo drug release over 40 days and observed real-time sustained release of near-infrared (NIR) fluorescence over an extended period from hydrophobic IR-780- and hydrophilic IR-783-loaded PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A implanted in live animals. Finally, we confirmed that PC<I><SUB>x</SUB></I>L<I><SUB>y</SUB></I>A films are usable as biodegradable, elastic drug carriers.</P>
Hierarchical Control for Nonlinear Systems by Partial-state Feedback
Kaihong Yang,Hai-bo Ji 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
In this paper, the hierarchical control problem is rephrased and addressed that systematically tackles thedesign of hierarchical control law between the concrete system and the abstract system. The proposed way to thisproblem, on one hand, incorporates simulation function technique, and on the other hand, allows us to design apartial-state feedback hierarchical control law. Following this approach, we design two hierarchical control lawsfor nonlinear systems. Finally, an example illustrates this approach.
Stabilization Analysis for a Class of Nonlinear Systems Based on Characteristic Model
Shaomin He,Hai-bo Ji 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6
This paper studies the characteristic modeling problem for a class of single input single output (SISO) nonlinear systems with a relative degree of two. Firstly, to deal with the complexities of high-order nonlinear systems, we provide a class of low order and slowly time-varying linear systems to represent the original systems. Secondly, based on the characteristic model, we propose a linear controller by using coefficients obtained from system online identification. Through the above two steps, we solve the stabilization problem of closed-loop system composed of the characteristic model and the linear controller. Furthermore, the stability analysis of the closed-loop system composed of an exact discrete-time model and a linear controller is given. Finally, two simulation examples are given to show the effectiveness of the proposed design.
Leader-Follower Consensus for a Class of Nonlinear Multi-Agent Systems
Xing-Hu Wang,Hai-Bo Ji 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.1
This paper deals with the leader-follower consensus problem for a class of nonlinear multi-agent sys-tems. All agents have identical nonlinear dynamics in the strict feedback form with Lipschitz growth condition. Both full state consensus protocol and dynamic output consensus protocol are provided. It is shown that under a connected undirected information communication topology, the proposed protocols can solve the leader-follower consensus problem. Two consensus protocol design procedures are presented and a numerical example is given to illustrate the proposed protocols.
Chuan-Rui Wang,Xing-Hu Wang,Hai-Bo Ji 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.4
This paper deals with the inverse optimal adaptive stochastic gain assignment problem for a class of Markovian jump nonlinear systems with constant unknown parameters. The Wiener noises have bounded but unknown covariance. It is shown that a sufficient condition to solve this problem is the existence of a Lyapunov function for a corresponding auxiliary system. By employing backstepping technique and common Lyapunov function method, an adaptive control law is designed, which solves this problem for a class of Markovian jump nonlinear systems in strict-feedback form. A numerical example is given to illustrate the theoretical analysis result.
Jin Zhu,Hong-sheng Xi,Hai-bo Ji,Bing Wang 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.2
A robust adaptive controller design for a class of Markovian jump parametric -strict-feedback systems is given. The disturbances considered herein include both uncertain nonlinearities and Wiener noises of unknown covariance. And they satisfy some bound-conditions. By using stochastic Lyapunov method in Markovian jump systems, a switching robust adaptive controller was obtained that guarantees global uniform ultimate boundedness of the closed-loop jump system.
A Guidance Law with Finite Time Convergence Considering Autopilot Dynamics and Uncertainties
Gui-Lin Li,Han Yan,Hai-Bo Ji 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.5
Taking into consideration both the autopilot dynamics and uncertainties, this paper proposes a finite time convergent guidance law for homing missile to intercept a maneuvering target. Firstly, an exact observer (differentiator) is employed to estimate the target maneuvers in finite time. Then, a fini-te time convergent guidance law is designed based on the existing finite time sliding-mode control the-ory. It is proved that the line-of-sight (LOS) angular rate converges to zero in finite time under the pro-posed guidance law. Compared with the existing finite time guidance laws, this guidance law can com-pensate for the effects of the autopilot dynamics and uncertainties, and the information used for feed-back control is much easier to obtain. Finally, simulation results show that our scheme, as a finite time convergent algorithm, has strong robustness to bounded disturbances.
배추 부산물의 식이섬유를 첨가한 글루텐프리 튀김 프리믹스의 품질특성
해설여,박지현,허예나,김민주,배귀석,장문백,문보경,Hai, Xue-Ru,Park, Ji-Hyun,Heo, Ye-Na,Kim, Min-Joo,Bae, Gui-Seck,Chang, Moon-Baek,Moon, Bo-Kyung 한국식품조리과학회 2017 한국식품조리과학회지 Vol.33 No.2
Purpose: The purpose of this study was to determine the quality characteristics of gluten-free frying pre-mix with insoluble dietary fiber powder (IDFP) from Chinese cabbage by-product. Methods: Frying powder mix was prepared with 0.5, 1.0, 1.5 or 2.0% IDFP. Fried powder mix only whit brown rice powder was used as a control. Spreadability, pick-up ratio and color of batter, texture, moisture and oil contents, oil absorption and sensory evaluation of fried sweet potato were determined. Results: L and a-values of batter decreased with increasing amount of IDFP, whereas b-value increased with IDFP addition. Hardness and crispiness of fried sweet potato increased with IDFP addition until 1.5%. Moisture content of fried sweet potato increased with higher IDFP addition whereas oil content and oil absorption decreased with increasing amount of IDFP. Sensory evaluation of fried sweet potato showed the best results in the 0.5% of IDFP addition group. Conclusion: Overall preference of IDFP samples was significantly higher than that of control. Based on the study, the optimal amount of IDFP for gluten-free fried powder mix was determined to be 0.5-1.5%.