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A Study on Equity Incentive Schemes of Wangsu Technology Enterprises
Weizhen Fang,김산월 사단법인 미래융합기술연구학회 2020 아시아태평양융합연구교류논문지 Vol.6 No.10
Because of differences in the internal and external environment and management of Chinese enterprises, the equity incentive system has not really played a role in promoting enterprise growth as it has in Western countries. A series of problems still need to be resolved and solutions need to be found. This study uses case study method to analyze Wangsu Technology Enterprises’ equity incentive system. The conclusion is that imperfections in China's capital markets make it difficult for the equity incentive system to play its intended role. Also, the equity incentive measures may lead to great unfairness and may dampen the enthusiasm of executives. The study gives suggestions to improve the equity incentive system’s efficiency in Chinese enterprises. The significance of this study is that it supplements the research on China's equity incentive schemes for individual enterprises and provides a theoretical basis as well as research in related fields.
Parameter Identification for a Quadrotor Helicopter Using Multivariable Extremum Seeking Algorithm
Weizhen Liu,Xin Huo,Jinkun Liu,Libin Wang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4
Parameter identification for a quadrotor helicopter is challenging from a theoretical point of view. In this paper, a closed-loop multivariable extremum seeking algorithm (MESA) is proposed for a nonlinear quadrotor helicopter parameter identification with two groups of input data. The proposed scheme is universally applicable to the closed-loop identification for cross-coupling multivariable processes where the identification problem is formulated as a minimization of a cost function. As the gradients of the performance parameters are obtained by step response experiments, the whole system searches along the negative gradient of the cost function until the reference trajectory or point is derived. Since the cost function is treated as a mapping from the model parameters, then the parameters can be identified online and in a real-time manner. The procedure of the identification algorithm is presented, and its effectiveness is illustrated by numerical simulations.
Improvement of Extrapolation of Traffic Load Effect on Highway Bridges Based on Rice’s Theory
Weizhen Chen,Cheng Ma,Zhenlin Xie,Bochong Yan,Jun Xu 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.3
It is a primary strategy in assessment, maintenance and rehabilitation of existing bridges in China to analyze structural safety using real traffic load data. For medium and large span bridges, the most common approach to extrapolate extreme load effect takes advantage of the Rice's theory. The method, however, has a problem of determining optimal starting effect interval for tail histogram curve fitting of crossing rate. At present, the problem is generally solved using the approach proposed by Cremona. But the approach is essentially subjective in computing procedure. This paper carries out the test and verification of Cremona’s approach, discovering remarkable discreteness of extrapolated extreme load effects, and in-depth study reveals further flaws-improper understanding of statistical concept, miscalculation of significance level, and deviation of extrapolation by linear fitting method. To solve these issues, this paper develops a new method of determining optimal starting interval for tail histogram fitting. Instead of direct application of the Kolmogorov theory to crossing rate histogram, the new method starts analysis with the sample empirical distribution of effect at arbitrary time in stochastic process. By characteristics analysis of Kolmogorov distribution variable, it figures out whether the stochastic process variable complies with the hypothesis of the Rice's theory or the fitting curve tails with its theoretical curve (identification of optimal starting interval). Through in-depth analysis and case study, it can be seen that the proposed method can best reduce subjectivity in analysis procedure and improve on the load effect extrapolation based on Rice’s theory.
The Structural Study of InN Thin Films Grown on Different Substrates by Using RF Sputtering Method
Weizhen HE,박세정,김형국,황윤회,이익재 한국물리학회 2010 새물리 Vol.60 No.4
We prepared the InN thin films by using RF sputtering on various substrates to investigate the structural characteristics of InN and to find an optimum condition of growing high-quality InN thin film on each substrate. The structural analysis of films deposited on Al₂O₃ (0001), Si (100), Pt(200)/TiO₂/SiO₂/Si, MgO (100) and GaAs (100) is reported by measuring x-ray diffraction and scanning electron microscopy. The InN thin films usually have wurtzite structure. At a certain growth condition, we could get the high quality InN on each substrates except Pt (100). Through atomic force microscopy measurement, it was observed that the InN thin films with c-axis preferred orientation have smoother surface than those with several orientations. It was also found that the thermal expansion coefficient of substrates is also important to get high quality InN thin film.
He, Weizhen,Atabaev, Timur Sh.,Kim, Hyung Kook,Hwang, Yoon-Hwae American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.35
<P>TiO<SUB>2</SUB> nanoparticle-based dye-sensitized solar cells (DSSCs) were modified by depositing a layer of a long-persistent phosphor, SrAl<SUB>2</SUB>O<SUB>4</SUB>:Eu<SUP>2+</SUP>,Dy<SUP>3+</SUP>, on top of the TiO<SUB>2</SUB> nanoparticle layer to prepare working electrodes of the DSSCs. SrAl<SUB>2</SUB>O<SUB>4</SUB>:Eu<SUP>2+</SUP>,Dy<SUP>3+</SUP> red-shifted the short UV wavelengths into the main absorption range of the dye commonly used in DSSCs. The SrAl<SUB>2</SUB>O<SUB>4</SUB>:Eu<SUP>2+</SUP>,Dy<SUP>3+</SUP> layer also acted as a light-scattering layer to reduce the loss of visible light. Incident photon to current conversion efficiency measurements showed that the application of such phosphor materials enhanced light-harvesting. The open-circuit voltage was found to be higher in the modified DSSCs. The electrons produced by the SrAl<SUB>2</SUB>O<SUB>4</SUB>:Eu<SUP>2+</SUP>,Dy<SUP>3+</SUP> particles contribute to the reduction of I<SUB>3</SUB><SUP>–</SUP> to I<SUP>–</SUP>, leading to a lower I<SUB>3</SUB><SUP>–</SUP> concentration in the electrolyte. This reduces the recapture of electrons injected in the conduction band of TiO<SUB>2</SUB> by triiodide ions and promotes the open circuit voltage. The performance of the modified DSSC device was improved compared with the cell using a working electrode without this phosphor layer. An overall 13% improvement in conversion efficiency of modified DSSCs was achieved due to the presence of the phosphor layer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-35/jp307954n/production/images/medium/jp-2012-07954n_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp307954n'>ACS Electronic Supporting Info</A></P>
Wang, Weizhen,Zhang, Juan,Hu, Honghong,Yu, Baojun,He, Jintong,Yao, Tingting,Gu, Yaling,Cai, Zhengyun,Xin, Guosheng Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.11
Objective: Inosine monophosphate (IMP) is a key factor that imparts of meat flavor. Differences in the IMP content in the muscles were evaluated to improve chicken meat quality. Methods: For this study, the IMP content was detected by high performance liquid chromatography. The gene expression profiles of Jingyuan chickens with different feeding patterns and different sexes were analyzed by RNA-sequencing (RNA-seq). Results: Breast muscle IMP content in free-range chickens was extremely significantly higher than that of caged chickens (p<0.01). Breast muscle IMP content in hens was also higher than that of cocks, but the difference was not significant. Correlation analysis showed that the breast muscle IMP content in caged hens and cocks was negatively correlated with the shear force, and the breast muscle IMP content in free-range hens was significantly negatively correlated with the shear force (p<0.05). The two key genes associated with IMP synthesis in chickens with different feeding patterns were glutamate-ammonia ligase (GLUL) and phosphodiesterase 10A (PDE10A). Bioinformatics analysis revealed that the GLUL and PDE10A genes are involved in glutamine biosynthesis and purine salvage pathways respectively. In addition, GLUL expression was positively correlated with the IMP content in caged and free-range chickens, and PDE10A expression was significantly positively correlated with the IMP content in caged and free-range chickens (p<0.05). Conclusion: These findings will facilitate the comprehension of the deposition of IMP in the muscles and thereby aid the process of selection and breeding of good quality local chickens.
Advantages of using Ti-mesh type electrodes for flexible dye-sensitized solar cells
He, Weizhen,Qiu, Jijun,Zhuge, Fuwei,Li, Xiaomin,Lee, Jae-Ho,Kim, Yang-Do,Kim, Hyung-Kook,Hwang, Yoon-Hwae IOP Pub 2012 Nanotechnology Vol.23 No.22
<P>We used Ti meshes for both the photoanodes and counter electrodes of dye-sensitized solar cells (DSSCs) to improve the flexibility and conductivity of the electrodes. These mesh type electrodes showed good transparency and high bendability when subjected to an external force. We demonstrated the advantages of cells using such electrodes compared to traditional transparent conducting oxide based electrodes and back side illuminated DSSCs, such as low sheet resistance, elevated photo-induced current and enhanced sunlight utilization. Nanotube layers of different thicknesses were investigated to determine their effect on the photovoltaic parameters of the cell. The overall efficiency of the best cells was approximately 5.3% under standard air mass 1.5 global (AM 1.5 G) solar conditions. Furthermore, the DSSCs showed an efficiency of approximately 3.15% due to the all Ti-mesh type electrodes even after illumination from the back side.</P>
The fabrication of TiO2 mesoporous thick films by employing a pre-embedded ZnO nanorods support.
He, Weizhen,Qiu, Jijun,Park, Se-Jeong,Lee, Jea-Ho,Kim, Yang-Do,Kim, Hyung-Kook,Hwang, Yoon-Hwae American Scientific Publishers 2009 Journal of nanoscience and nanotechnology Vol.9 No.12
<P>TiO2 mesoporous films with a thickness more than 2 microm were synthesized through the evaporation-induced self-assembly approach. In order to prevent the formation of cracks due to the strain during the calcination, we employed the ZnO nanorod arrays as a pre-embedded support, which were obtained from an aqueous solution method. The spaces between ZnO nanorods were filled with TiO2 sol-gel by a dip-coater. Then ZnO nanorods embedded in the thick film were eliminated by a wet chemical etching method and the left spaces were refilled by the TiO2 sol-gel. As a result, a dense and thick TiO2 mesoporous film was obtained. The resultant materials were characterized in detail by using small angle X-ray diffraction (SAXRD), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy methods (TEM).</P>