Predictive Current Control of a PMSM Three-Level Dual-Vector Model Based on Self-Anti-Disturbance Techniques

Zhang Xiao,Tao Ran,Xu Xiaoming,Wang Tingjie,Zhang Hui 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

Finite control set-model predictive control (FCS-MPC) has become a hotspot for power electronics applications and research in recent years due to its conceptual simplicity, ease of handling system constraints and excellent multivariable control capability. However, the traditional FCS-MPC vector selection direction is more fi xed and the steady-state performance of the system is poor, while the speed outer loop uses PI control and the speed regulation eff ect is easily infl uenced by the motor parameters and cannot solve the problem of fast and overshoot free at the same time. To address these problems, a threelevel two-vector model predictive current control method for permanent magnet synchronous motors is proposed based on a self-anti-disturbance technique. For the speed outer loop, a fi rst-order linear active disturbance rejection control is used instead of the traditional PI control, which solves the problem of overshooting and speed incompatibility and improves the robustness of the system; for the current inner loop, the idea of dual-vector model prediction is introduced to expand the selection range of the voltage vector, making the selection of the voltage vector more accurate, while a vector partitioning strategy is used to reduce the computational burden. The control system is modelled and simulated using MATLAB/Simulink. Simulation and test results show that the method has good parameter robustness, fast dynamic response and satisfactory steady-state performance.

Two-dimensional superlattices of Bi nanoclusters formed on a Au(111) surface using porous supramolecular templates

Ran ZHANG,Guoqing LYU,Cheng CHEN,Tao LIN,Jun LIU,Pei Nian LIU,Nian LIN 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

A New Adamantane-like Tetranuclear Manganese(III) Complex Based on Flexible Schiff-base Ligand: Synthesis, Crystal Structure and Magnetic Property

Ran Zhang,Zhong-Hai Ni,Li-Fang Zhang,Hui-Zhong Kou 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7

A new tetranuclear Mn(III) complex [MnIII 4(sae)4(μ3-O)(μ1,1-N3)(OH)(H2O)2]·H2O (1) (H2sae = 2-salicylideneamino- 1-ethanol) has been synthesized by the reaction of MnCl2·4H2O, H2sae and sodium azide in the mixed solvent of methanol, acetonitrile and water. The X-ray diffraction analysis shows that the four Mn(III) ions in complex 1 have a unique adamantine arrangement, whereas the coordination environment of each Mn(III) ions is different. Magnetic studies indicate that complex 1 manifests antiferromagnetic behaviors. The magnetic susceptibilities of complex 1 have been fitted by two magnetic models based on the suitable analysis of its magnetic structural topology.

A New Adamantane-like Tetranuclear Manganese(III) Complex Based on Flexible Schiff-base Ligand: Synthesis, Crystal Structure and Magnetic Property

Zhang, Ran,Ni, Zhong-Hai,Zhang, Li-Fang,Kou, Hui-Zhong Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.7

A new tetranuclear Mn(III) complex $[Mn^{III}{_4}(sae)_4({\mu}_3-O)({\mu}_{1,1}-N_3)(OH)(H_2O)_2]{\cdot}H_2O$ (1) ($H_2sae$ = 2-salicylideneamino-1-ethanol) has been synthesized by the reaction of $MnCl_2{\cdot}4H_2O$, $H_2sae$ and sodium azide in the mixed solvent of methanol, acetonitrile and water. The X-ray diffraction analysis shows that the four Mn(III) ions in complex 1 have a unique adamantine arrangement, whereas the coordination environment of each Mn(III) ions is different. Magnetic studies indicate that complex 1 manifests antiferromagnetic behaviors. The magnetic susceptibilities of complex 1 have been fitted by two magnetic models based on the suitable analysis of its magnetic structural topology.

Possible Epithelial Ovarian Cancer Association with HPV18 or HPV33 Infection

Zhang, Pei-Pei,Zhou, Lei,Cao, Jia-Shi,Li, Yi-Ping,Zeng, Zhi,Sun, Ni,Shen, Li,Zhu, Hao-Yue,Ruan, Yang,Zha, Wen-Ting,Wang, Xin-Yu,Zhang, Ke-Qiang,Zhang, Ran Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.6

The present study was conducted to investigate the prevalence of HPV infection in epithelial ovarian cancer (EOC) in Hunan province. DNA samples were collected from paraffin embedded ovarian tissue from 322 patients with EOC, 99 with ovarian benign tumors and 199 normal persons. The polymerase chain reaction and direct sequencing were used to identify the HPV types in the samples. The relationship between the infection of human papillomavirus (HPV) and the epithelial ovarian carcinoma (EOC) was investigated combined with clinical data. The prevalence of HPV18 and HPV33 in EOC group and benign group was higher than in the normal group. HPV18 and HPV33 may play a role in the development of both EOC and ovarian benign tumor and may participate in the development of EOC with traditional risk factors, family history and abortion, possibly exerting synergistic effects.

MEROMORPHIC SOLUTIONS OF A COMPLEX DIFFERENCE EQUATION OF MALMQUIST TYPE

Zhang, Ran-Ran,Huang, Zhi-Bo Korean Mathematical Society 2014 대한수학회보 Vol.51 No.6

In this paper, we investigate the finite order transcendental meromorphic solutions of complex difference equation of Malmquist type $$\prod_{i=1}^{n}f(z+c_i)=R(z,f)$$, where $c_1,{\ldots},c_n{\in}\mathbb{C}{\backslash}\{0\}$, and R(z, f) is an irreducible rational function in f(z) with meromorphic coefficients. We obtain some results on deficiencies of the solutions. Using these results, we prove that the growth order of the finite order solution f(z) is 1, if f(z) has Borel exceptional values $a({\in}\mathbb{C})$ and ${\infty}$. Moreover, we give the forms of f(z).

혁신지향적 조직문화가 직무성과에 미치는 영향: 직무몰입의 매개효과와 경영자의 서번트리더십 조절효과를 중심으로

ZHANG RAN,HUANG FEI 세명대학교 인문사회과학연구소 2024 人文 社會科學硏究 Vol.32 No.1

· 연구 주제: 본 논문은 기업의 혁신지향적 조직문화가 직무성과에 어떠한 영향을 미치는지에 대하여 연구한다. 또한 기업의 혁신지향적 조직문화와 직무성과 간의 관계에서 직무몰입이 매개효과가 존재하는지에 대해서 연구한다. 더 나아가, 본 논문에서는 혁신지향적 조직문화와 직무성과 간의 관계에서 경영자의 서번트리더십이 조절효과가 있는지에 대하여 조사한다. · 연구 배경: 혁신지향적 조직문화는 조직이 혁신을 촉진하고 지원하는 문화를 의미한다. 조직의 혁신은 조직의 경쟁력을 향상시키고, 직무성과와도 밀접한 관련이 있다. 그리고 혁신지향적 조직문화를 가진 조직의 구성원들은 적극적인 조직의 지원 하에 직무에 몰입하여 조직의 목표와 개인의 목표를 일치시킬 수 있다. 또한 리더십 스타일 둥에서 서번트리더십은 조직원들이 자연스럽게 리더를 존경하고 따르게 됨으로써, 혁신지향적 조직문화와 직무성과 간의 영향관계에 유의한 영향을 미칠 수 있다. · 선행연구와의 차이점: 첫째, 본 논문은 혁신지향적 조직문화의 중요성을 일깨워 줌으로써 기업의 경영자나 조직의 리더에게 혁신적이고 변화를 두려워하지 않는 조직문화를 형성해야 함을 상기시킨다. 둘째, 본 논문의 연구결과는 인사조직 분야의 연구영역 확장에 기여한다. 특히, 서번트리더십의 영향력에 대하여 실증분석을 통해 객관적인 연구결과를 제시함으로써 리더십 학술분야 발전에 공헌할 것으로 예상된다. 셋째, 실무적으로 직무성과를 향상시키기 위하여 비전이나 목표 수립 시 고려해야 할 조직문화와 리더십에 대하여 유용한 정보를 제시한다. · 연구방법: 기업에 근무하는 회사원들을 대상으로 온라인 설문조사 수행하였다. 총 328명에게 온라인 링크를 생성하여 비대면으로 설문조사를 실시하였고, 불성실한 응답한 설문지나 비정상적으로 응답한 설문지는 표본에서 제거한 후 최종적으로 실증분석에 사용된 표본은 295명이 정상적으로 응답한 설문지이다. 본 논문에서는 가설검증을 위하여 다음과 같이 실증분석을 수행하였다. 그리고 빈도분석과 기술통계분석을 수행하였고, 탐색적 요인 분석과 신뢰성 분석을 실시했다. 또한 단순 회귀분석을 실시하였으며 매개효과 검증 및 조절 효과 검증을 수행했다. · 연구결과: 연구가설 1인 “혁신지향적 조직문화는 직무성과에 긍정적인 영향을 미칠 것이다.”는 채택되었다. 그리고 연구가설 2인 “직무몰입은 혁신지향적 조직문화가 직무성과에 미치는 영향관계에서 매개효과가 있을 것이다.”는 부분매개효과가 있는 것으로 나타남에 따라, 가설 2는 부분적으로 채택되었다. 마지막으로 연구가설 3은 두 개의 세부가설로 나누어지는데, 연구가설 3-1인 “서번트리더십 중 윤리성은 혁신지향적 조직문화가 직무성과에 미치는 영향관계에서 조절효과가 있을 것이다.”는 채택되었다. 그리고 연구가설 3-2인 “서번트리더십 중 관계형성 및 권한위임은 혁신지향적 조직문화가 직무성과에 미치는 영향관계에서 조절효과가 있을 것이다.”는 기각되었다. · 공헌점 및 기대효과: 첫째, 본 논문의 연구결과는 기업의 조직문화의 중요성을 상기시키고 올바르고 건강한 조직문화를 형성하기 위해 노력해야 함을 시사한다. 둘째, 본 논문은 인적자원 관리 분야의 연구영역 확장에 기여한다. 특히, 리더십 중 서번트리더십의 효과에 대하여 객관적인 연구결과를 제시함 ... · Research topics: This paper studies how a company's innovation-oriented organizational culture affects job performance. It also studies whether work commitment has a mediating effect in the relationship between corporate innovation-oriented organizational culture and job performance. Furthermore, this paper investigates whether managerial servant leadership has a moderating effect in the relationship between innovation-oriented organizational culture and job performance. · Research background: Innovation-oriented organizational culture refers to a culture in which an organization promotes and supports innovation. Organizational innovation improves the competitiveness of the organization and is closely related to job performance. And members of organizations with an innovation-oriented organizational culture can align their organizational goals with individual goals by immersing themselves in their jobs with the support of active organizations. In addition, servant leadership in the leadership style can have a significant impact on the relationship between innovation-oriented organizational culture and job performance as members naturally respect and follow the leader. · Differences from prior research: First, this paper reminds corporate managers or organizational leaders that an innovative and change-free organizational culture should be formed by awakening the importance of an innovation-oriented organizational culture. Second, the research results of this paper contribute to the expansion of the research area in the field of personnel organization. In particular, it is expected to contribute to the development of leadership academic fields by presenting objective research results through empirical analysis on the influence of servant leadership. Third, useful information on organizational culture and leadership that should be considered when establishing a vision or goal to improve job performance practically is presented. · Research method: An online survey was conducted on office workers working in companies. A total of 328 people were asked to conduct a non-face-to-face survey by creating an online link, and after removing the questionnaire that responded insincerely or abnormally from the sample, the sample used for the empirical analysis was the questionnaire that 295 people normally responded to. In this paper, empirical analysis was performed to verify the hypothesis as follows. In addition, frequency analysis and descriptive statistical analysis were performed, and exploratory factor analysis and reliability analysis were performed. In addition, simple regression analysis was conducted, and mediating effect verification and moderating effect verification were performed. · Research results: Research Hypothesis 1, "Innovation-oriented organizational culture will have a positive effect on job performance," was adopted. And as research hypothesis 2, "Work commitment will have a mediating effect in the influence relationship of innovation-oriented organizational culture on job performance," was found to have a partial mediating effect, Hypothesis 2 was partially adopted. Finally, research hypothesis 3 is divided into two detailed hypotheses, and research hypothesis 3-1, "Ethics among servant leadership will have a moderating effect in the relationship between innovation-oriented organizational culture's influence on job performance," was adopted. And research hypothesis 3-2, "Relational formation and delegation of authority among servant leadership will have a moderating effect in the influence relationship of innovation-oriented organizational culture on job performance," was rejected. · Contribution points and expected effects: First, the research results of this paper remind us of the importance of corporate organizational culture and suggest that efforts should be made to form a correct and healthy organizational culture. Second, this paper contributes to the expansion of the research area in the fie...

Meromorphic solutions of a complex difference equation of Malmquist type

Ran-Ran Zhang,Zhibo Huang 대한수학회 2014 대한수학회보 Vol.51 No.6

In this paper, we investigate the finite order transcendental meromorphic solutions of complex difference equation of Malmquist type n ∏ i=1 f(z + ci) = R(z, f), where c1, . . ., cn ∈ C\ {0}, and R(z, f) is an irreducible rational function in f(z) with meromorphic coefficients. We obtain some results on defi- ciencies of the solutions. Using these results, we prove that the growth order of the finite order solution f(z) is 1, if f(z) has Borel exceptional values a(∈ C) and 1. Moreover, we give the forms of f(z).

Art Portrait Design Based on Mobile Internet in Digital Media

Ran Zhang 한국멀티미디어학회 2023 The journal of multimedia information system Vol.10 No.1

With the improvement of people's living standards and art appreciation, more and more people are engaged in the design and collection of art portrait. At the same time, the development of new generation information technology, such as digital media and mobile internet, has also made art portrait design techniques more diverse and more rich artistic styles. However, facing a huge number of art portrait, the current management work is mainly carried out manually by professionals, with high people and financial costs. Therefore, it is of great significance to study the effective and correct design and management of art portrait and apply digital mobile technology to provide users with more accurate art portrait. For the demand of art portrait design, this paper takes print, oil painting, ink painting and watercolor painting as the research object, and pro-poses a deep learning model Mask R-CNN. Based on the multi-disciplinary fields such as deep neural network, digital media and art, this paper analyzes and studies an art portrait design system based on mobile internet. In the paper, the in-depth learning model Mask R-CNN is applied in the system. By comparing the accuracy of the training of Mask R-CNN and U-Net models, this paper analyzes the effectiveness of the two models in extracting art portrait features. In addition, Mask R-CNN model is applied to the art portrait design system based on mobile internet. The final experimental results show that the art portrait design system using Mask R-CNN model has higher prediction and detection accuracy and has better practicability for art portrait design and art communication.

POSITIVE SOLUTIONS TO p-KIRCHHOFF-TYPE ELLIPTIC EQUATION WITH GENERAL SUBCRITICAL GROWTH

Zhang, Huixing,Zhang, Ran Korean Mathematical Society 2017 대한수학회보 Vol.54 No.3

In this paper, we study the existence of positive solutions to the p-Kirchhoff elliptic equation involving general subcritical growth $(a+{\lambda}{\int_{\mathbb{R}^N}{\mid}{\nabla}u{\mid}^pdx+{\lambda}b{\int_{\mathbb{R}^N}{\mid}u{\mid}^pdx)(-{\Delta}_pu+b{\mid}u{\mid}^{p-2}u)=h(u)$, in ${\mathbb{R}}^N$, where a, b > 0, ${\lambda}$ is a parameter and the nonlinearity h(s) satisfies the weaker conditions than the ones in our known literature. We also consider the asymptotics of solutions with respect to the parameter ${\lambda}$.