Performance Analysis of a New Type of Automated Container Terminal

Wei Yan,Yishi Zhu,Junliang He 보안공학연구지원센터 2014 International Journal of Hybrid Information Techno Vol.7 No.2

A Study on the Impact of China’s Insurance Industry on Socio-economic Development

Wei Yan,Du Qinjun 한국무역경영학회 2022 한국무역경영연구 Vol.- No.27

Drawing on the panel data of 30 provinces and cities in China from 2011 to 2018,this paper adopts the Solow Growth Model to empirically test the impact of China’s insurance industry on domestic socio-economic development through calculating the benchmark ratio of insurance penetration (BRIP), insurance density (ID), and insurance total efficiency (ITE). The results prove that among the selected insurance industry indicators, benchmark ratio of insurance penetration, life insurancedensity, the efficiency of the insurance’s financial intermediary function, and other indicators all significantly promote socio-economic development with the exception of the property insurance density and the functional efficiency of the insurance payout. On the whole, for present-day China, stepping up efforts to expand the insurance industry, raising the people’s insurance awareness, and elevating the operational efficiency of the insurance industry can all benefit socio-economic development, and the positive role of insurance has hence been pursued.

Dynamic analysis of semi-rigidly connected and partially embedded piles via the method of reverberation-ray matrix

Wei Yan,W.Q. Chen 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.2

Free vibration and dynamic responses of piles semi-rigidly connected with the superstructures are investigated. Timoshenko beam theory is employed to characterize the pile partially embedded in a two-parameter elastic foundation. The formulations for the method of reverberation-ray matrix (MRRM)are then derived to investigate the dynamics of the pile with surface cracks, which are modeled as massless rotational springs. Comparison with existent numerical and experimental results indicates the proposed method is very effective and accurate for dynamic analysis, especially in the high frequency range. Finally, the effects of some physical parameters on the natural frequencies, frequency responses and transient responses of the piles are studied.

An Algorithm for Vein Matching Based on Log-polar Transform

Wei Yan,Jianbin Xie,Peiqin Li,Tong Liu,Xiaoguang Guo 한국산학기술학회 2013 SmartCR Vol.3 No.5

This article discusses a new algorithm for vein matching based on log-polar transform to address problems that occur with the changing of finger position and from differences between imaging devices for current vein matching algorithms. The new algorithm first extracts the feature area, which contains enough characteristics for image matching, depending on the structure of the finger vein ridge alignment. It then calculates the degree of similarity between the log-polar transform results of the model image feature areas and the sample image, and finally analyzes the result by the degree of similarity and the relationship of relative positions between feature areas. Experiments show that the algorithm is robust for rotating and zooming images of the finger vein.

Research on Thermal Refocusing System of High-resolution Space Camera

Weiyan Li,Qunbo Lv,Jian Wei Wang,Na Zhao,Zheng Tan,Linlin Pei 한국광학회 2022 Current Optics and Photonics Vol.6 No.1

A high-resolution camera is a precise optical system. Its vibrations during transportation and launch, together with changes in temperature and gravity field in orbit, lead to different degrees of defocus of the camera. Thermal refocusing is one of the solutions to the problems related to in-orbit defocusing, but there are few relevant thermal refocusing mathematical models for systematic analysis and research. Therefore, to further research thermal refocusing systems by using the development of a high-resolution micro-nano satellite (CX6-02) super-resolution camera as an example, we established a thermal refocusing mathematical model based on the thermal elasticity theory on the basis of the secondary mirror position. The detailed design of the thermal refocusing system was carried out under the guidance of the mathematical model. Through optical–mechanical–thermal integration analysis and Zernike polynomial calculation, we found that the data error obtained was about 1%, and deformation in the secondary mirror surface conformed to the optical index, indicating the accuracy and reliability of the thermal refocusing mathematical model. In the final ground test, the thermal vacuum experimental verification data and in-orbit imaging results showed that the thermal refocusing system is consistent with the experimental data, and the performance is stable, which provides theoretical and technical support for the future development of a thermal refocusing space camera.

Synthesis and Photo-Response of CuS Thin Films by an In Situ Multi-Deposition Process at Room Temperature: A Facile and Eco-Friendly Approach

Weiyan Liu,Huiming Ji,Jian Wang,Xuerong Zheng,Junyun Lai,Junna Ji,Tongfei Li,Yuanliang Ma,Haiqin Li,Suqin Zhao,Zhengguo Jin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3

"Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as anionic reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a selfperfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag/AgCl electrode for the annealed CuS thin films. CuS-sensitized TiO2 solar cells had a maximum conversion efficiency of 0.224%."

Robust Hybrid Controller Design for Batch Processes with Time Delay and Its Application in Industrial Processes

Weiyan Yu,Jiang Song,Jingxian Yu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.11

A new design method of two-dimensional (2D) controller for multi-phase batch processes with time delay and disturbances is proposed to ensure the stability of the control system and realize efficient production in industry. The batch process is first converted to an equivalent but different dimensional 2D-FM switched system. Based on the 2D system framework, then sufficient conditions of a controller existence expressed by linear matrix inequalities (LMIs) that stabilizing system is given by means of the average dwell time method. Meanwhile, robust hybrid 2D controller design containing extended information is proposed and the minimum runtime lower bound of each sub-system is accurately calculated. The design advantages of the controller depend on the size of the time delay so it has a certain degree of robustness. At the same time, considering the exponential stability, the system can have a faster rate of convergence. In addition, the introduction of extended information has improved the control performance of the system to some extent. The acquisition of minimum time at different phases will promote certain production efficiency and thus reduce energy consumption. Finally, an injection process in industrial production process has been taken as an example to verify effectiveness of the proposed method.

Ethnic minority-serving higher education institutions in the United States and China: a comparative case study of two institutions

Xiong Weiyan,Jacob W. James 서울대학교 교육연구소 2020 Asia Pacific Education Review Vol.21 No.2

Tribal Colleges and Universities in the United States and Ethnic Minority-Serving Institutions in China play a signifcant role in changing the underrepresented status of American Indians and Alaska Natives (AIANs) and Chinese Ethnic Minorities (CEMs) in their respective higher education systems. This comparative study of two ethnic minority-serving institutions— Diné College in the US and Yanbian University in China—examines strategies and practices each institution uses to address challenges in serving Navajo and Korean Chinese students and communities. Through conducting semi-structured interviews with senior administrators from two institutions and AIAN and CEM content area experts, this study confrms that Diné College and Yanbian University play important roles in providing higher education opportunities and preserving indigenous and ethnic cultures and languages. From a comparative perspective, the eforts of Diné College and Yanbian University in addressing challenges difer because of their respective political and higher education contexts.

Current Status of Serum Insulin and C-Peptide Measurement in Clinical Laboratories: Experience from 94 Laboratories in China

Zhou Weiyan,Deng Yuhang,Zhao Haijian,Zhang Chuanbao 대한진단검사의학회 2022 Annals of Laboratory Medicine Vol.42 No.4

Background: Accurate measurements of serum insulin and C-peptide are needed for the therapy and classification of diabetes. This study investigated the status of serum insulin and C-peptide measurements in China by analyzing the results of five pooled serum samples measured in 94 laboratories. Methods: Patient serum samples were pooled into five groups according to insulin and C-peptide concentrations and measured in 94 laboratories using different measurement systems. The inter- and intra-laboratory %CV as well as inter- and intra-measurement system %CV were calculated to assess the status of insulin and C-peptide measurements. To verify whether the disagreement between laboratories was due to different calibrators, as reported in previous studies, one low-level and one high-level sample extracted from the five pooled serum samples were used to recalibrate clinical measurement systems. Results: The mean intra-laboratory, intra-measurement system, inter-laboratory, and inter-measurement system %CVs were 2.7%, 4.8%, 21.8%, and 22.4%, respectively, for insulin and 2.3%, 6.7%, 16.4%, and 24.5%, respectively, for C-peptide. The inter- and intra-laboratory %CVs for insulin decreased with increasing concentration. After recalibration with low- and high-level samples, the mean inter-measurement %CV decreased from 22.4% to 17.2% for insulin and from 24.5% to 5.7% for C-peptide. Conclusions: The intra-laboratory and intra-measurement system imprecision values are satisfactory for serum insulin and C-peptide measurements. However, the results from laboratories using different measurement systems were not comparable, and there is still much work needed to achieve the standardization or harmonization of serum insulin and C-peptide measurements.

High-Conductivity SiO2-Matrix B-Doped Si-NC Thin Films by Following Ion-Beam Treatment

Junjun Huang,Weiyan Wang,Jie Yang,Yongzhen Tan,Wei Chen,Tianyu Ge,Yajun Zhang,Min Gao,Zhenming Chen 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6

In this work, further ion-beam was performed on SiO2-matrix B-doped Si-NC (SBC) thin films in order to enhance conductivity. The effect of ionbeamtype on the electrical properties of SBC thin films was investigatedsystematically. The results indicated that the conductivities of SBC thinfilms were significantly improved by both argon and hydrogen ion-beamtreatments, and the higher the hydrogen ion ratio, the higher theconductivity of SBC thin films. The conductivity of SBC thin films wasincreased from 1.82 × 10−6 S/cm to 3.2 × 10−3 S/cm with followinghydrogen-ion-beam treatment. The change in conductivity of SBC thinfilms was most possibly resultant from the ion-beam treatment facilitatingthe formation of higher superficial order and lower defects. An alternativemethod was proposed to prepare high-conductivity SBC thin films, whichmay be applied to other heterogeneous thin films.