Electrical and magnetic properties of BiFe0.97−xMn0.03ZnxO3 thin films with different Zn content synthesized by chemical solution deposition (CSD)

Changchun Chen,Gui Wang,Lurong Wang,Chunhua Lu,Zhongzi Xu 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6

BiFe0.97−xMn0.03ZnxO3 (BFMZ) thin films with various Zn contents (x = 0, 0.01, 0.02, 0.05, and 0.1) were prepared on Pt/Ti/SiO2/Si (100) substrates by a chemical solution deposition (CSD) technique. The crystal structures of BFMZ thin films were analyzed by X-ray diffraction (XRD). The effects of the Zn content on the magnetic, dielectric properties, and leakage current of these BFMZ films were thoroughly investigated. The analysis by XRD demonstrated that all the BFMZ thin films were of a polycrystalline rhombohedral perovskite structure with the space group R3c. For the BFMZ thin films, slim magnetic hysteresis (M-H) loops were observed, and the saturated magnetization (Ms) of the BFMZ thin film increased with an increase of the Zn content. Compared to the other BFMZ thin films with Zn content between 0.01 and 0.1, the BFMZ thin film with Zn content x = 0 has the largest dielectric constant and the smallest dielectric loss. In addition, With co-doping of Mn2+ and Zn2+ ions at Fe3+ sites in the BFMZ thin films, the leakage current density increased with an increase of the Zn concentration in the films.

A 15 GHz, <tex> $-$</tex>182 dBc/Hz/mW FOM, Rotary Traveling Wave VCO in 90 nm CMOS

Changchun Zhang,Zhigong Wang,Yan Zhao,Sung Min Park THE INSTITUTE OF ELECTRICAL ENGINEERS 2012 IEEE Microwave and Wireless Components Letters Vol. No.

<P>This letter presents a phase-noise-centric design methodology of a rotary traveling wave voltage controlled oscillator (RTW VCO). Based upon this methodology, a 15 GHz multiphase RTW VCO is realized in a standard 90 nm CMOS process. Particularly, shielded coplanar striplines are exploited to provide better shielding protection and higher characteristic impedance with comparable Q-factor than conventional coupled transmission lines. Measured results of the proposed RTW VCO demonstrates the frequency tuning range of 2 GHz, the output power level of 11.3 dBm, the phase noise of 109.6 dBc/Hz at 1 MHz offset, the clock RMS jitter of 2 , and the power dissipation of 12 mW from a single 1.2-V supply. The chip core occupies the area of 0.2 .</P>

A Novel Intelligent Recommendation Algorithm based on Web Data Mining Technique under the Background of Deep Neural Network

Changchun Yang,Jun Wang,Min Yuan,Chenyang Lei 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.2

The development of the Internet brought us into an era of big data information, give people bring convenient while and also make people ragged when choosing the required information and recommendation system arises at the historic moment, and get the wide attention and applications. Therefore, to enhance the traditional method, we propose a novel intelligent recommendation algorithm based on Web data mining technique under the background of the deep neural network. Firstly, we review the state-of-the-art web data mining algorithms and revise the traditional ones with the parallel data mining algorithm on the multiple processors to perform tasks that will enhance the accuracy and efficiency. Then, we analyze basic neural network model through the inner connection and weight transfer. Later, we introduce the deep network structure to enhance the traditional network. Finally, we combine the revised prior theories into the recommending tasks for enhancement. The experimental analysis show that our algorithm accuracy is enhanced by the extent of 56% and overall time is reduced to the 87% of traditional ones which proves the feasibility. Later, more optimization work will be introduced to modify the current methodology.

Investigation of nano-sized ZnO particles fabricated by various synthesis routes

Changchun Chen,Benhai Yu,Ping Liu,JiangFeng Liu,Lin Wang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4

Nano-sized ZnO particles were synthesized by a direct precipitation, a sol-gel, and a hydrothermal method. The structures,morphology, and optical properties of these ZnO nanoparticles fabricated by the above-mentioned methods were also characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Ultraviolet-visible spectroscopy (UV-vis). In addition, the photocatalytic activities of the synthesized ZnO nanoparticles were evaluated via the degradation of methyl orange (MO) in an aqueous solution. These experimental results demonstrated that the photodegradation efficiency of MO solutions irradiated by UV for 120 minutes with ZnO nano-particles used as catalysts, which were fabricated by a direct precipitation method could reach 94.59% or so. The higher photocatalytic activity of methyl orange solutions by the ZnO nanoparticles synthesized by the direct precipitation method is probably ascribed to the spherical ZnO nanoparticles with a smaller crystalline size.

A 15-㎓ CMOS Multiphase Rotary Traveling-Wave Voltage-Controlled Oscillator

Changchun Zhang,Zhigong Wang,Yan Zhao,Sung Min Park 대한전자공학회 2012 Journal of semiconductor technology and science Vol.12 No.3

This paper presents a 15-㎓ multiphase rotary traveling-wave voltage-controlled oscillator (RTW VCO) where a shielded coplanar stripline (CPS) is exploited to provide better shielding protection and lower phase noise at a moderate cost of characteristic impedance and power consumption. Test chips were implemented in a standard 90-㎚ CMOS process, demonstrating the measured results of 2-㎓ frequency tuning range, -11.3-㏈m output power, -109.6-㏈c/㎐ phase noise at 1-㎒ offset, and 2-ps RMS clock jitter at 15 ㎓. The chip core occupies the area of 0.2 ㎟ and dissipates 12 ㎽ from a single 1.2-V supply.

Multi-channel 5Gb/s/ch SERDES with Emphasis on Integrated Novel Clocking Strategies

Changchun Zhang,Ming Li,Zhigong Wang,Kuiying Yin,Qing Deng,Yufeng Guo,Zhengjun Cao,Leilei Liu 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.4

Two novel clocking strategies for a high-speed multi-channel serializer-deserializer (SERDES) are proposed in this paper. Both of the clocking strategies are based on groups, which facilitate flexibility and expansibility of the SERDES. One clocking strategy is applicable to moderate parallel I/O cases, such as high density, short distance, consistent media, high temperature variation, which is used for the serializer array. Each group within the strategy consists of full-rate phase-locked loop (PLL), a full-rate delay-locked loop (DLL), and t재 fixed phase alignment (FPA) techniques. The other is applicable to more awful I/O cases such as higher speed, longer distance, inconsistent media, serious crosstalk, which is used for the deserializer array. Each group within the strategy is composed of a PLL and two DLLs. Moreover, a half-rate version is chosen to realize the desired function of 1:2 deserializer. Based on the proposed clocking strategies, two representative ICs for each group of SERDES are designed and fabricated in a standard 0.18㎛ CMOS technology. Measurement results indicate that the two SERDES ICs can work properly accompanied with their corresponding clocking strategies.

Ameliorative effects of atractylodin on intestinal inflammation and co-occurring dysmotility in both constipation and diarrhea prominent rats

Changchun Yu,Yuan Lin,Yong-jian Xiong,Da-peng Chen,Yanli Li,Bin Xu,Zeyao Tang,Chunling Jiang,Li Wang 대한약리학회 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.1

Intestinal disorders often co-occur with inflammation and dysmotility. However, drugs which simultaneously improve intestinal inflammation and cooccurring dysmotility are rarely reported. Atractylodin, a widely used herbal medicine, is used to treat digestive disorders. The present study was designed to characterize the effects of atractylodin on amelioration of both jejunal inflammation and the co-occurring dysmotility in both constipation-prominent (CP) and diarrheaprominent (DP) rats. The results indicated that atractylodin reduced proinflammatory cytokines TNF-α, IL-1β, and IL-6 in the plasma and inhibited the expression of inflammatory mediators iNOS and NF-kappa B in jejunal segments in both CP and DP rats. The results indicated that atractylodin exerted stimulatory effects and inhibitory effects on the contractility of jejunal segments isolated from CP and DP rats respectively, showing a contractile-state-dependent regulation. Atractylodininduced contractile-state-dependent regulation was also observed by using rat jejunal segments in low and high contractile states respectively (5 pairs of low/ high contractile states). Atractylodin up-regulated the decreased phosphorylation of 20 kDa myosin light chain, protein contents of myosin light chain kinase (MLCK), and MLCK mRNA expression in jejunal segments of CP rats and down-regulated those increased parameters in DP rats. Taken together, atractylodin alleviated rat jejunal inflammation and exerted contractile-state-dependent regulation on the contractility of jejunal segments isolated from CP and DP rats respectively, suggesting the potential clinical implication for ameliorating intestinal inflammation and co-occurring dysmotility.

Multi-channel 5Gb/s/ch SERDES with Emphasis on Integrated Novel Clocking Strategies

Zhang, Changchun,Li, Ming,Wang, Zhigong,Yin, Kuiying,Deng, Qing,Guo, Yufeng,Cao, Zhengjun,Liu, Leilei The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.4

Two novel clocking strategies for a high-speed multi-channel serializer-deserializer (SERDES) are proposed in this paper. Both of the clocking strategies are based on groups, which facilitate flexibility and expansibility of the SERDES. One clocking strategy is applicable to moderate parallel I/O cases, such as high density, short distance, consistent media, high temperature variation, which is used for the serializer array. Each group within the strategy consists of a full-rate phase-locked loop (PLL), a full-rate delay-locked loop (DLL), and two fixed phase alignment (FPA) techniques. The other is applicable to more awful I/O cases such as higher speed, longer distance, inconsistent media, serious crosstalk, which is used for the deserializer array. Each group within the strategy is composed of a PLL and two DLLs. Moreover, a half-rate version is chosen to realize the desired function of 1:2 deserializer. Based on the proposed clocking strategies, two representative ICs for each group of SERDES are designed and fabricated in a standard $0.18{\mu}m$ CMOS technology. Measurement results indicate that the two SERDES ICs can work properly accompanied with their corresponding clocking strategies.

Ameliorative effects of atractylodin on intestinal inflammation and co-occurring dysmotility in both constipation and diarrhea prominent rats

Yu, Changchun,Xiong, Yongjian,Chen, Dapeng,Li, Yanli,Xu, Bin,Lin, Yuan,Tang, Zeyao,Jiang, Chunling,Wang, Li The Korean Society of Pharmacology 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.1

Intestinal disorders often co-occur with inflammation and dysmotility. However, drugs which simultaneously improve intestinal inflammation and co-occurring dysmotility are rarely reported. Atractylodin, a widely used herbal medicine, is used to treat digestive disorders. The present study was designed to characterize the effects of atractylodin on amelioration of both jejunal inflammation and the co-occurring dysmotility in both constipation-prominent (CP) and diarrhea-prominent (DP) rats. The results indicated that atractylodin reduced proinflammatory cytokines TNF-${\alpha}$, IL-$1{\beta}$, and IL-6 in the plasma and inhibited the expression of inflammatory mediators iNOS and NF-kappa B in jejunal segments in both CP and DP rats. The results indicated that atractylodin exerted stimulatory effects and inhibitory effects on the contractility of jejunal segments isolated from CP and DP rats respectively, showing a contractile-state-dependent regulation. Atractylodin-induced contractile-state-dependent regulation was also observed by using rat jejunal segments in low and high contractile states respectively (5 pairs of low/high contractile states). Atractylodin up-regulated the decreased phosphorylation of 20 kDa myosin light chain, protein contents of myosin light chain kinase (MLCK), and MLCK mRNA expression in jejunal segments of CP rats and down-regulated those increased parameters in DP rats. Taken together, atractylodin alleviated rat jejunal inflammation and exerted contractile-state-dependent regulation on the contractility of jejunal segments isolated from CP and DP rats respectively, suggesting the potential clinical implication for ameliorating intestinal inflammation and co-occurring dysmotility.

Disturbance Observer-based Nonsingular Fast Terminal Sliding Mode Fault Tolerant Control of a Quadrotor UAV with External Disturbances and Actuator Faults

Fang Wang,Zhigang Ma,Hongmei Gao,Chao Zhou,Changchun Hua 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4

This paper addresses a nonsingular fast terminal sliding mode fault tolerant control (NFTSMFTC) scheme based on disturbance observer (DO) for a quadrotor UAV in the presence of external disturbances and actuator additive faults. Firstly, by analyzing the dynamic characteristics of a quadrotor UAV, the model is decoupled into outer-loop (position subsystem) and inner-loop (attitude subsystem). Secondly, the DO is utilized to deal with external disturbances and actuator additive faults effectively. Furthermore, nonsingular fast terminal sliding mode control (NFTSMC) can avoid the chattering problems of traditional sliding mode control (SMC) and singularity problems of terminal SMC. Moreover, compared with nonsingular terminal SMC, it behaves the faster convergence rate. So the NFTSMC method is applied to design controller. Finally, in the framework of Lyapunov theory, the stability of the closed-loop system is analyzed, and the tracking error is asymptotically stable. The effectiveness of the proposed control scheme is verified by simulation results.