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ZHI JIANG,HAIRONG ZHANG,ZHONGPENG WANG,MINGXIA CHEN,WENFENG SHANGGUAN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.4
The simultaneous catalytic removal of NOx and soot over the rare earth element (REE) oxide-based mixture oxides loaded with potassium and transition nanosized metal oxide (designated as M/K/REE oxide) was investigated by using temperature-programmed reaction (TPR). The influence of the type of REE oxides together with the type and amount of transitional metal oxides on the catalytic removal activity was discussed. K/Nd2O3 was found to be the most active oxide among the REE oxides to simultaneous remove the NOx and soot under lean conditions. Chromium oxide was more active than the other transition metal oxides on enhancing the activity of soot oxidation of Nd2O3 loaded with potassium. The optimum loading level of chromium was about 10 wt%, with ignition temperature at about 237°C and the conversion ratio NO → N2 about 24.1%. The Mn-loading on K/Nd2O3 resulted in the biggest conversion efficiency of NO to N2 at about 30.2%. The increasing catalytic reaction of NOx–soot activities is attributed to the formation of complex crystalline phase in the catalyst together with the improving contacting between catalysts and soot.
Four-user 10-Gb/s spectrally phase-coded O-CDMA system operating at /spl sim/30 fJ/bit
Zhi Jiang,Dongsun Seo,Shangda Yang,Leaird, D.E.,Roussev, R.V.,Langrock, C.,Fejer, M.M.,Weiner, A.M. IEEE 2005 Photonics Technology Letters Vol.17 No.3
<P>We demonstrate a four-user 10-Gb/s spectrally phase-coded optical code-division multiple-access system via nonlinear processing with ultralow power (/spl sim/30 fJ/bit). Full interference suppression is achieved in a time-slotted scheme without the need for chip-level coordination and synchronous detection. Performance degradation caused by pulse overlap between users is investigated.</P>
Cellulose–chitosan interpenetrating polymer network for electro-active paper actuator
Cai, Zhijiang,Kim, Jaehwan Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.114 No.1
<P>In this article, the cellulose-chitosan interpenetrating polymer network (IPN) films were prepared and fabricated as the electro-active paper actuator. The characteristics of the cellulose–chitosan IPN films were examined by SEM, FT-IR, XRD, DSC, and tensile test. The performance of the IPNs based actuator was evaluated in terms of bending displacement with respect to the actuation frequency, voltages, humidity levels, chitosan content, and time variation. It was observed that with chitosan content increasing in the IPNs, the crystallinity decreased and the network became denser, which caused the Young's modulus to increase. Chitosan content in IPNs also significantly affected the bending performance. The optimum IPN weight ratio of cellulose and chitosan was 60 : 40. The maximum bending displacement of 7.2 mm was found at 80% relative humidity level. In terms of durability, the bending lifetime at 70% humidity level was about 10 h with 17% performance degradation. More issues on the actuator performance and durability are addressed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>
Cai, Zhijiang,Kim, Jaehwan Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.109 No.6
<P>This article introduces a cellulose/polyurethane (PU) semi-IPN-based electroactive paper (EAPap) actuator. The fabrication process, bending actuation test, and its characteristics are explained. For the fabrication of cellulose/PU semi-IPN EAPap actuator, cotton cellulose was dissolved into N,N-dimethylacetamide (DMAc) and lithium chloride (LiCl) solvent system. PU prepolymer prepared by poly[di(ethylene glycol) adipate] and hexamethylene diisocyanate (HDI) was mixed with DMAc cellulose solution by stirring. The mixed solution was spin-coated on a wafer and cured to form cellulose/PU semi-IPN films using 1,1,1-tris(hudroxymethyl)propane as the crosslinker. The characteristics of the cellulose/PU semi-IPN film were investigated by FTIR, scanning electron microscopy (SEM), X-ray diffraction pattern (XRD), and tensile test. The bending actuation performance of the actuator was evaluated in terms of free bending displacement with respect to the actuation frequencies, voltages, and humidity levels. It shows a good bending actuation at room humidity condition. The actuation principle of the actuator is also discussed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008</P>
Cai Zhijiang,Yang Guang,김재환 한국물리학회 2011 Current Applied Physics Vol.11 No.2
Bio-nanocomposite was prepared by impregnation of bacterial cellulose into the poly(3-hydroxybutyrate)(PHB). The morphology was examined by field emission scanning electron microscopy, which showed the well-dispersed bacterial cellulose nanofibrils in PHB. The changes in the crystallinity of PHB caused by incorporating the bacterial cellulose were investigated by X-ray diffraction. The result indicates that the bacterial cellulose nanofibrils probably help the PHB molecules to crystallize. An increase in the mechanical properties was observed by impregnating bacterial cellulose as reinforcement into the PHB matrix. The biocompatibility of nanocomposite was preliminarily evaluated by cell-adhesion studies using Chinese Hamster Lung (CHL) fibroblast cells. The cells incubated with nanocomposite scaffold for 48 h were capable of forming cell adhesion and proliferation, which shows much better biocompatibility than pure PHB.
Dry and durable electro-active paper actuator based on natural biodegradable polymer
Cai, Zhijiang,Kim, Jaehwan Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of applied polymer science Vol.115 No.4
<P>This article describes a dry and durable electro-active paper (EAPap) actuator based on natural biodegradable polymer: cellulose and chitosan. To fabricate this actuator, cellulose and chitosan were dissolved in trifluoroacetic acid. The solution was cast to form a film followed by depositing thin gold electrode on both sides of the film. The actuator was actuated under AC voltage at an ambient condition by changing the actuation voltage, frequency, and time. The actuator revealed a large bending displacement under low voltage, electrical power consumption at low humidity condition. This cellulose–chitosan blended EAPap actuator is suitable for dry and durable actuator. Details about the fabrication, durability, electrical power consumption, and characteristics as well as morphology of the actuator are explained. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010</P>
Genetic Algorithm-based Optimal Design Strategy of a Continuum Surgical Manipulator
Haodong Wang,Zhijiang Du,Zhiyuan Yan,Yongzhuo Gao 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.10
A novel wire-driven continuum surgical robot for laryngeal surgery is presented. The surgical robot is composed of a power transmission interface, a continuum manipulator, a surgical forceps and motors. The motion of the surgical robot is obtained by causing a controlled deformation in the continuum manipulator, which is the core part of the surgical robot. Therefore, the structural design optimization problem of continuum manipulators is solved in this paper. Based on the structure of the continuum manipulator, optimization objectives which include loadcarrying capacity and secondary deformation are established. The non-dominant sorting genetic algorithm with elite strategy (NSGA-II) is adopted for multi-objective optimization. An experimental prototype is constructed based on the designed optimization results. The load-carrying and space-traversal capacity tests prove the effectiveness of the proposed optimization algorithm.
An Adaptive Sliding Mode-Like P-type Iterative Learning Control for Robot Manipulators
Yi Long,Zhijiang Du,Weidong Wang 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Iterative learning control(ILC) is used to track the trajectory of repetitive motion, especially for industrial robot. The proposed control scheme is based upon the feedback of tracking error and corresponding change rate, which construct a switching surface, with the use of a proportional structure, for which it is called sliding mode-like P-type ILC. In addition, an adaptive item was added to not only cope with the unknown parameters and disturbances but also. remove chatter phenomenon happening in control process. To verify the proposed control law, a conventional PD ILC and an adaptive PD ILC are added as comparison with all the same setting conditions. We use root mean square error (RSME) each iteration trial as performance evaluation index. Finally, simulation results are provided to illustrate the effectiveness of the proposed controller. As a result, it can achieve better performance.