An Optimized PI Controller Design for Three Phase PFC Converters Based on Multi-Objective Chaotic Particle Swarm Optimization

Xin Guo,Hai-Peng Ren,Ding Liu 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

The compound active clamp zero voltage soft switching (CACZVS) three-phase power factor correction (PFC) converter has many advantages, such as high efficiency, high power factor, bi-directional energy flow, and soft switching of all the switches. Triple closed-loop PI controllers are used for the three-phase power factor correction converter. The control objectives of the converter include a fast transient response, high accuracy, and unity power factor. There are six parameters of the controllers that need to be tuned in order to obtain multi-objective optimization. However, six of the parameters are mutually dependent for the objectives. This is beyond the scope of the traditional experience based PI parameters tuning method. In this paper, an improved chaotic particle swarm optimization (CPSO) method has been proposed to optimize the controller parameters. In the proposed method, multi-dimensional chaotic sequences generated by spatiotemporal chaos map are used as initial particles to get a better initial distribution and to avoid local minimums. Pareto optimal solutions are also used to avoid the weight selection difficulty of the multi-objectives. Simulation and experiment results show the effectiveness and superiority of the proposed method.

Design and analysis of an origami-inspired deployable grasping manipulator

Xin Guo,Changqing Gao,Hailin Huang,Bing Li,Yingxue Yao,Guanglu Jia 한국생산제조학회 2018 한국생산제조시스템학회 학술발표대회 논문집 Vol.2018 No.10

The Structure of Mind in Neo-Confucianism Analyzed from the Metaphysical Differences of Cheng Hao and Cheng Yi

( Zhang Xinguo ) 성균관대학교 유교문화연구소 2014 儒敎文化硏究(中文版) Vol.0 No.22

理學不僅是一種旣定的文化知識形態, 更標志了一種特有的和曆久彌新的哲學精神, 而後者更實質性地彰顯了理學的思想史意義。二程形上學的區別主要表現爲理念世界和生活世界的不同面向。這種區別直接形塑了理學的精神結構, 卽對於意義生成和健全人格的雙重要求。考察理學的精神結構內在地要求對於理學家形上學區別的辨析。辨析在以形上學爲基礎的理學精神結構中對於意義世界及其歷史性的把握方式, 二程形上學的區別爲此提供了典型文本。儒家哲學的實踐智慧亦可在此得到比較淸晳的展示。 Neo-Confucianism signifies not only an established form of culture and knowledge, but also a unique and enduring philosophical spirit. The latter more correctly reflects the significance of Neo-Confucianism in the history of thought. The metaphysical difference between Cheng Hao and Cheng Yi lies mainly in their differing approaches to the ideal world and the living world. The difference directly constitutes the structure of mind in Neo-Confucianism That is to say, Neo-Confucian approaches to mind require both the creation of significance and the perfection of personality. This can be seen as the analysis of the inner structure of mind and the metaphysical ideas of Neo-Confucianism In this regard, the metaphysics of Cheng brothers exemplifies how to understand the difference between the ideal world and historicity in the structure of mind in Neo-Confucianism. This study also provides several examples of Confucianism’s practical wisdom. [Article in Chinese]

Anti-glioma Effect and Safety of Docetaxel-loaded Nanoemulsion

Huil Gaoe,Xinguo Jiang,Zhiqing Pang,Shuaiqi Pan,Shijie Cao,Zhi Yang,Chen Chen 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.2

Docetaxel, an inhibitor of microtubule depolymerization, has been used for many malignancies. Due to its toxicity and the non-selective distribution of its commercial formulation, Taxotere®, new formulations with less toxicity and tumor targeting need to be explored. For its safety and ease of factory scale production, nanoemulsion, was selected to encapsulate docetaxel. The particle size of docetaxel loaded nanoemulsion (DNE) was 72.3 nm, the average zeta potential was −6.38 mV, the encapsulation efficiency was 93.1% and the drug loading capacity was 2.87%. Although DNE presented similar antiproliferation effects on both U87 cells and bEnd.3 cells, its in vivo toxicity was significantly lower than Taxotere®. In vivo fluorescent imaging suggested nanoemulsions loaded with a fluorescent probe could distribute to the brain and accumulate at the glioma site. The pharmacological experiments also confirmed that the DNE could target glioma sites and prolong the median survival time of mice with gliomas. In conclusion, DNE is a new, less toxic, drug formulation that is effective for brain glioma therapy.

Preparation and electrochemical performance of porous carbon derived from polypyrrole

Wu Lili,Chen Xinguo,Ding Chang,Wang Pitao,Luo Heming 한국탄소학회 2023 Carbon Letters Vol.33 No.2

Supercross-linked polymers are widely used as carbon precursor materials due to their abundant carbon sources and low cost. In this paper, a supercross-linked polymer was prepared by the solvothermal method. The supercross-linked polymer as a precursor and the PPyC-800-A was synthesized by activating this with KOH. The microstructure, structure, and electrochemical performances of porous carbon PPyC-800-A were studied at different of temperature and carbon alkali ratio. According to the results, the porous carbon PPyC-800-1:2 is mainly composed of a stack of spherical particles with a high surface area of 1427.03 m2 g−1, an average pore diameter of 2.32 nm, and a high specific capacitance of 217.7 F g−1 at a current density of 1.0 A g−1 in a 6 M KOH electrolyte. It’s retention rate is 97.58% after 5000 constant current charges and discharges. With a specific capacitance decay rate of 21.91 percent, an energy density of 11.96 Wh kg−1, and a power density of 500.0 W kg−1, the current density rises from 1.0 A g−1 to 10.0 A g−1, exhibiting remarkable electrochemical properties, cycling stability, and energy production performance This study contributes experimental ideas to the field of supercross-linked polymer-derived carbon materials and energy storage.

Cytogenetical Identification in Seven Species of Elytrigia Desv.

Mao Peisheng,Wang Xinguo,Huang Ying,Meng Lin,Mao Peichun 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08

The ploid level of 46 germplasms of Elytrigia Desv. were observed and determined with the microscope, which are from 21 countries and areas that United States of America offered. The results showed these accessions were grouped into three distinct ploid levels including diploidy, tetraploidy and hexaploidy in E. intermedia, E. repens, E. elongata, E. pontica, E. caespitosa, E. juncea, E. alatavica. There were 24 diploid accessions, 1 tetraploidy and 1 hexaploidy in E. intermedia; 4 diploid accessions and 3 tetraploidy in E. repens, 6 texaploidy and 1 hexaploidy in E. elongata, 1 diploidy and 2 tetraploidy in E. pontica, all of E. caespitosa, E. juncea and E. alatavica were diploidy.

Study of the preparation and electrochemical performance of porous carbon derived from hypercrosslinked polymers

Wu Lili,Wang Pitao,Chen Xinguo,Zhang Jianqiang,Luo Heming 한국탄소학회 2022 Carbon Letters Vol.32 No.3

Hypercrosslinked polymers HCPs have been widely used as precursors to prepare porous carbon materials because of their highly ordered porous structure and large specific surface area. In this paper, we used a solvothermal method to prepare a hypercrosslinked polymer, and the HCPC-700-A was prepared using an activation method with the hypercrosslinked polymer as the precursor. The effects of different carbon–alkali ratios on the microstructure, composition and electrochemical properties of porous carbon HCP were studied. The results show that the surface of porous carbon HCPC-700-A presents a relatively regular geometric shape, and a large number of pore structures are mainly micro- and mesopores. The specific surface area is 2074.53 m2 g−1, and the average pore size is between 1.29 and 1.93 nm. Porous carbon HCPC-700-1:2 has excellent electrochemical performance in 1 M H2SO4, and the specific capacitance is up to 464.4 F g−1 at a current density of 1 A g−1. The specific capacitance decay rate is 29.72% when the current density is increased from 1 A g−1 to 8 A g−1. After 5000 cycles, the capacitance retention rate is 91.16% at a current density of 2 A g−1, showing excellent electrochemical performance, good cycle stability and perfect energy storage performance. This research provides new experimental ideas for HCPs in the electrochemical energy storage field.

Hypersonic Aero-Heating Ground-Test Simulation Technique

Li, Ruiqu,Yao, Dapeng,Sha, Xinguo,Gong, Jian The Society for Aerospace System Engineering 2015 International Journal of Aerospace System Engineer Vol.2 No.2

It would encounter some complicated flow fields, such as transition, separation, reattachment and disturbances, in the hypersonic flight. Thus, it is difficult to theoretically analyze the hypersonic aerothermodynamics effects, so that the ground-test simulation is thought of as one of the most important methods to improve the understanding level of the hypersonic aerothermodynamics. However, the aero-heating tests could not simulate all aerodynamics and geometry parameters in the real flight due to the differences between the experimental environments supplied by the ground facilities and the flight, so that the feasible technique for the ground-test simulation of the hypersonic aerothermodynamics effects is required to be advanced. The key parameters that are especially required to simulate for aero-heating tests are analyzed and one detailed approach is suggested to perform the experimental investigation on the hypersonic aero-heating effects in the ground facilities in this paper, and the tests are performed in the FD-20 gun tunnel of CAAA (China Academy of Aerospace Aerodynamics) to give out the data which could be used to confirm the equation from the theoretical analysis.

The Method of Aiming towards the Normal Direction for Robotic Drilling

Yuhao Gao,Dan Wu,Yunfei Dong,Xinguo Ma,Ken Chen 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.6

During the robotic drilling of an aircraft assembly, the normal directions of the workpieces are to be measured to guide the robot by aiming the spindle at the real normal directions of the curved surfaces. This paper describes the development of a method of using four laser displacement sensors to measure the normal direction and the implementation of the proposed method in a robotic drilling system to meet industrial application requirements. First, a novel mechanical structure is introduced to achieve a higher installation accuracy for the laser displacement sensors with a micro adjusting method. Next, the hardware structures and a convenient method of calibrating the sensors are introduced. To accommodate the complexity of the industrial circumstance, a procedure of measuring and adjusting is developed with consideration of both an angular deviation threshold and a limited adjusting iteration. Finally, the experiments of measuring and adjusting iteratively show that two iterations can achieve a satisfactory angular deviation of 0.1° for planar workpieces and three iterations are required for curved workpieces, with the perpendicularity errors of the drilled holes being less than 0.3°. The results can meet the required perpendicularity accuracy of 0.5°.

Estimation of Effect of Fertilization on Physical and Chemical Properties at Paddy Fields in China

Jin-Ho Kim(김진호),Xuebin Qi(제학무),Zhou Xinguo(주진국),Jong-Sik Lee(이종식),Won-Il Kim(김원일),Kuk-Heon Han(한국헌),Jeong-Taek Lee(이정택) 한국토양비료학회 2006 한국토양비료학회 학술발표회 초록집 Vol.2006 No.5