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Effects of V2O5 on sinterability and microwave dielectric properties of NaCa4V5O17 ceramics
Guoguang Yao,Yang Li,Jingjing Tan,Cuijin Pei,Yan Zhang,Jia Chen 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
The NaCa4V5O17 ceramics owing low sintering temperature had been prepared via conventional solid state reaction methodusing V2O5 as vanadium source. The sinterability, microwave dielectric characterisations and compatibility with Ag wereinvestigated. Pure phase NaCa4V5O17 with triclinic structure was confirmed by Rietveld refinement and Raman spectrum. Thepermittivity (εr) and quality factor (Qxf) values mainly depended on the relative density, whereas the temperature coefficientof resonant frequency (τf) value was closely connected with the tetrahedral distortion of V(1)O4. The NaCa4V5O17 ceramicssintered at 800 oС owned high densification and moderate microwave dielectric performances under 10.7 GHz: εr = 9.5, Q×f= 34,200 GHz, τf = -90.0 ppm/oС, but poor chemical compatibility with Ag paste.
( Wei Wang ),( Guoguang Zhang ),( Jinmei Zou ) 한국응용생명화학회 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.1
Polysaccharides have attracted great attention for their wide range of applications in biological and medical fields. In this paper, the interaction of polysaccharides with human serum albumin (HSA) was systematically investigated by fluorescence (FL) spectroscopy and circular dichroism (CD) spectra under different conditions. The Stern-Volmer quenching constants (Ka) at different ionic strength and pH were calculated, and information of the structural features of HSA was discussed. FL and CD results indicate that both hydrophobic and electrostatic interactions play important roles during the binding process. The quenching of the fluorescence resulting the binding of polysaccharides and HSA is static.
Group-consensus with Reference States for Heterogeneous Multiagent Systems via Pinning Control
Jun Huang,Guoguang Wen,Zhaoxia Peng,Xing Chun Wang,Youwei Dong 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
This paper considers group-consensus with reference states for heterogeneous multiagent systems, whichis composed of first-order agents and second-order agents. The pinning scheme is induced for solving groupconsensusunder fixed and switching topologies, respectively. Firstly, a group-consensus control protocol viapining scheme under fixed topology is proposed. Then the corresponding sufficient conditions to guarantee groupconsensusare deduced by employing graph theory and Lyapunov stability approach. What’s more, based on pinningscheme, the agents in every group can reach their own group’s reference states. Secondly, the group-consensus forheterogeneous multiagent systems with switching topologies is studied, where an equivalent system of the originalmultiagent system is obtained by model transformation. Then, the corresponding sufficient conditions to guaranteegroup-consensus are obtained based on the corresponding graph theory and Lyapunov stability approach. The sameas the case of fixed topology, the agents in every group can also reach their own group’s reference states by employingpinning control. Finally, some simulation examples are presented to illustrate the capabilities of the establishedtheories.
2.5D human pose estimation for shadow puppet animation
( Shiguang Liu ),( Guoguang Hua ),( Yang Li ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.4
Digital shadow puppet has traditionally relied on expensive motion capture equipments and complex design. In this paper, a low-cost driven technique is presented, that captures human pose estimation data with simple camera from real scenarios, and use them to drive virtual Chinese shadow play in a 2.5D scene. We propose a special method for extracting human pose data for driving virtual Chinese shadow play, which is called 2.5D human pose estimation. Firstly, we use the 3D human pose estimation method to obtain the initial data. In the process of the following transformation, we treat the depth feature as an implicit feature, and map body joints to the range of constraints. We call the obtain pose data as 2.5D pose data. However, the 2.5D pose data can not better control the shadow puppet directly, due to the difference in motion pattern and composition structure between real pose and shadow puppet. To this end, the 2.5D pose data transformation is carried out in the implicit pose mapping space based on self-network and the final 2.5D pose expression data is produced for animating shadow puppets. Experimental results have demonstrated the effectiveness of our new method.
Aperiodically Intermittent Adaptive Event-triggered Control for Linear Multi-agent Systems
Yunlong Zhang,Guoguang Wen,Ahmed Rahmani,Xiaoqin Zhai 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.1
This paper investigates the aperiodically intermittent adaptive event-triggered control strategy for general linear multi-agent systems. The aperiodically intermittent adaptive event-triggered control inherits the respective advantages of aperiodically intermittent control strategy, event-triggered control strategy and adaptive control strategy, which improves communication efficiency, reduces control update frequency and is closer to the practical situations. Firstly, to reach leader-following consensus and save more control resources, a distributed aperiodically intermittent event-triggered scheme is devised, in which the transmission channels among agents only open if the local event-trigger condition is satisfied in predefined time intervals. Then, in order to get rid of continuous inter-agent communication for monitoring the triggering condition, a more general triggering mechanism is presented, in which discrete-time combinational measurement is adopted instead of using continuous-time tracking error directly. Next, to overcome the unexpected large feedback gains in real applications and appropriately tune the feedback gains, the aperiodically intermittent adaptive event-triggered controller is further devised. With aid of the matrix theory, stability theory of switching systems and Lyapunov function, some sufficient criteria are deduced. Moreover, the analyses of excluding the Zeno behavior are included, and explicit positive lower bounds between any two consecutive time intervals are rigorously guaranteed. Finally, the effectiveness for the designed control strategies is validated by simulations.
Jing Bai,Guoguang Wen,Yu Song,Ahmed Rahmani,Yongguang Yu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.1
The distributed formation control of fractional-order multi-agent systems is mainly studied under directedcommunication graphs in this paper. Firstly, a control law with relative damping and communication delay areproposed. Then, some sufficient conditions for achieving formation control are derived using matrix theory, graphtheory and the frequency domain analysis method. Finally, based on the numerical method of predictor-corrector,several simulations are presented to illustrate the effectiveness of the obtained results.
Yao Li,Guoguang Cheng,Jinlong Lu,Hu Long 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In this paper, in order to identify the formation mechanism of duplex (Ca,Mn)S inclusions in steel, based on the two heats ofcommercial Ca-treated resulfurized steel, the characteristics of duplex (Ca,Mn)S inclusions in bars, blooms and CaO-Al2O3oxides in molten steel were observed and analyzed. The results indicate that there are three types of duplex (Ca,Mn)S inclusionsin steel. The first type with over 20% Ca in (Ca,Mn)S is named as “Type-C”, the second with 4–20% Ca in (Ca,Mn)Sis named as “Type-MC” and the third with below 4% Ca in (Ca,Mn)S is named as “Type-M”. Their core oxides are mainlyCa-Mg–Al-O oxides. The aspect ratios of duplex (Ca,Mn)S inclusions in bars decrease as Ca content in (Ca,Mn)S increases. From Type-M to Type-C, CaO content in core oxides increases, and Ca content in wrapping (Ca,Mn)S increases. The shapeof duplex (Ca,Mn)S inclusions can be controlled through controlling CaO content in core oxides. During solidification,CaO-Al2O3 oxides become as heterogeneous nucleation cores of MnS inclusions, duplex (Ca,Mn)S inclusions forming inthis way, and Ca in wrapping (Ca,Mn)S come from CaO in core oxides. The higher CaO content in core oxides, the higherCa content in wrapping (Ca,Mn)S. Under the condition with specific Ca/S ratio in steel, to obtain more duplex (Ca,Mn)Sinclusions, numbers of Type-C should be decreased, and numbers of Type-MC and Type-M should be increased. To achievethis goal, the key is to obtain larger numbers of CaO-Al2O3 oxides with lower CaO and smaller sizes in molten steel.
Jinlong Lu,Guoguang Cheng,Julong Che,Liansheng Wang,Guojian Xiong 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
In this paper, the characteristics of tensile fractures and the typical inclusions in as-cast blooms and as-rolled bars are carefullyinvestigated to figure out the causes of different transverse tensile properties in two commercial non-quenched andtempered steels. In low Ca bearing steel (3 ppm), MgO–Al2O3 (MA) + MnS are main inclusions and MA oxides expresshigh ability for MnS heterogeneous nucleation. Consequently, the MnS inclusions in as-rolled bars are larger in size andsmaller in number, the transverse ductility is satisfied due to the high space distance between the MnS inclusions. However,the transverse ductility of high Ca bearing steel (9 ppm) is much poor because MnS inclusions are agminated in distribution,causing severe stress concentration. The calculation results show that CaO in CaO–MgO–Al2O3 oxides (CMA) wouldreact with Al and S in molten steels, suppressing the formation of MnS inclusions on surface of CMA oxides. An integratedillumination including the evolution processes of typical oxides in molten steels, the generation behaviors of MnS duringthe solidification, the deformation behaviors of sulfides and the relationship between sulfides and crack initiation have beenconducted based on observation results and thermodynamic calculation.
BAO WU,GUOGUANG RONG,JUNWEI ZHAO,SHULIN ZHANG,YONGXIN ZHU,BOYONG HE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.6
One third of the world population is estimated to have Mycobacterium tuberculosis infection. It is urgent to develop a rapid, inexpensive and convenient diagnostic method for detection of tuberculosis. Porous silicon material has taken more and more attention in recent years for biosensing applications and some useful results have been obtained. In this paper, we report the feasibility of applying porous silicon microcavity biosensor in a novel and relatively rapid serodiagnostic approach. Nowadays, most of serodiagnostic tests are based on labeled detection. Applying label-free detection methods can help develop fast and e±cient tuberculosis diagnostic tools, which can meet the current demand. In this study, we use this label-free sensing platform (i.e., porous silicon microcavity) to detect the interaction between 16 kDa antigen and anti-16 kDa antibody. Through a series of experiments, we verify the speci¯city and examine the sensitivity of this new diagnostic technique. The results show that it is feasible to apply porous silicon microcavity in the tests of tuberculosis.
Bing Yu,Qiyong Guo,Guoguang Fan,Na Liu 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.4
Objective: We wanted to investigate the usefulness of event-related (ER) functional MRI (fMRI) for the assessment of cortical visual impairment in infants with periventricular leukomalacia (PVL). Materials and Methods: FMRI data were collected from 24 infants who suffered from PVL and from 12 age-matched normal controls. Slow ER fMRI was performed using a 3.0T MR scanner while visual stimuli were being presented. Data analysis was performed using Statistical Parametric Mapping software (SPM2), the SPM toolbox MarsBar was used to analyze the region of interest data, and the time to peak (TTP) of hemodynamic response functions (HRFs) was estimated for the surviving voxels. The number of activated voxels and the TTP values of HRFs were compared. Pearson correlation analysis was performed to compare visual impairment evaluated by using Teller Acuity Cards (TAC) with the number of activated voxels in the occipital lobes in all patients. Results: In all 12 control infants, the blood oxygenation level-dependent (BOLD) signal was negative and the maximum response was located in the anterior and superior part of the calcarine fissure, and this might correspond to the anterior region of the primary visual cortex (PVC). In contrast, for the 24 cases of PVL, there were no activated pixels in the PVC in four subjects, small and weak activations in six subjects, deviated activations in seven subjects and both small and deviated activations in three subjects. The number of active voxels in the occipital lobe was significantly correlated with the TAC-evaluated visual impairment (p < 0.001). The mean TTP of the HRFs was significantly delayed in the cases of PVL as compared with that of the normal controls. Conclusion: Determining the characteristics of both the BOLD response and the ER fMRI activation may play an important role in the cortical visual assessment of infants with PVL. Objective: We wanted to investigate the usefulness of event-related (ER) functional MRI (fMRI) for the assessment of cortical visual impairment in infants with periventricular leukomalacia (PVL). Materials and Methods: FMRI data were collected from 24 infants who suffered from PVL and from 12 age-matched normal controls. Slow ER fMRI was performed using a 3.0T MR scanner while visual stimuli were being presented. Data analysis was performed using Statistical Parametric Mapping software (SPM2), the SPM toolbox MarsBar was used to analyze the region of interest data, and the time to peak (TTP) of hemodynamic response functions (HRFs) was estimated for the surviving voxels. The number of activated voxels and the TTP values of HRFs were compared. Pearson correlation analysis was performed to compare visual impairment evaluated by using Teller Acuity Cards (TAC) with the number of activated voxels in the occipital lobes in all patients. Results: In all 12 control infants, the blood oxygenation level-dependent (BOLD) signal was negative and the maximum response was located in the anterior and superior part of the calcarine fissure, and this might correspond to the anterior region of the primary visual cortex (PVC). In contrast, for the 24 cases of PVL, there were no activated pixels in the PVC in four subjects, small and weak activations in six subjects, deviated activations in seven subjects and both small and deviated activations in three subjects. The number of active voxels in the occipital lobe was significantly correlated with the TAC-evaluated visual impairment (p < 0.001). The mean TTP of the HRFs was significantly delayed in the cases of PVL as compared with that of the normal controls. Conclusion: Determining the characteristics of both the BOLD response and the ER fMRI activation may play an important role in the cortical visual assessment of infants with PVL.