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ORE EXTENSIONS OF HOPF GROUP COALGEBRAS
Dingguo Wang,Daowei Lu 대한수학회 2014 대한수학회지 Vol.51 No.2
The aim of this paper is to generalize the theory of Hopf-Ore extension on Hopf algebras to Hopf group coalgebras. First the concept of Hopf-Ore extension of Hopf group coalgebra is introduced. Then we will give the necessary and sufficient condition for the Ore extensions to become a Hopf group coalgebra, and certain isomorphism between Ore extensions of Hopf group coalgebras are discussed.
ORE EXTENSIONS OF HOPF GROUP COALGEBRAS
Wang, Dingguo,Lu, Daowei Korean Mathematical Society 2014 대한수학회지 Vol.51 No.2
The aim of this paper is to generalize the theory of Hopf-Ore extension on Hopf algebras to Hopf group coalgebras. First the concept of Hopf-Ore extension of Hopf group coalgebra is introduced. Then we will give the necessary and sufficient condition for the Ore extensions to become a Hopf group coalgebra, and certain isomorphism between Ore extensions of Hopf group coalgebras are discussed.
On Essential Supernilpotency of Gamma Rings
Wang Dingguo ...et al KYUNGPOOK UNIVERSITY 1999 Kyungpook mathematical journal Vol.39 No.2
We study essential supernilpotency of Γ-rings. Many of the known results of rings are extended to Γ-rings. Let M be a Γ-ring in the sense of Nobusawa. The ring ◁수식 삽입▷(원문을 참조하세요) was defined by Kyuno. We also established the relationships between essential supernilpotency and the unique largest essentially supernilpotent ideals of Γ-ring M and the corresponding supernilpotency and ideals of the right operator ring R of M, the matrix Γ_(n,m)-ring M_(m,n), the M-ringΓ and the ring M₂ are established.
Novel DQ transform and time delay module-based phase-locked loop
An, Dingguo,Yuan, Lifen,He, Yigang,Yin, Baiqiang,Li, Bing The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
The Phase-Locked-Loop (PLL) based on quadrature signal generation (QSG) is widely used in the synchronization units of power systems. Being one of the most popular QSG-PLLs, the time delay unit-based PLL (TD-PLL) is simple and easy to implement. However, when the frequency of the input signal deviates from its rated value, the orthogonality of the QSG output signal and the original input signal cannot be guaranteed, which leads to the generation of double frequency components. To solve this problem, this paper analyzes the generation mechanism for the double frequency component of the TD-PLL. Then, a quadrature signal generation and processing module is built based on a DQ transform and time delay unit to eliminate the double frequency component. This ability is the key part of the proposed PLL (DQ-TD-PLL). Finally, the performance of DQ-TD-PLL is evaluated with simulations and experiments. The obtained results show that the proposed DQ-TD-PLL can eliminate the influence of double frequency component. It can also be seen that the proposed method has better dynamic performance when compared with other methods in the literature.
A MODIFIED NONMONOTONE FILTER TRUST REGION METHOD FOR SOLVING INEQUALITY CONSTRAINED PROGRAMMING
Hua Wang,Dingguo Pu 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.3
SQP method is one of the most important methods for solving nonlinear programming. But it may fail if the quadratic subproblem is inconsistent. In this paper, we propose a modified nonmonotone filter trust region method in which the QP subproblem is consistent. By means of nonmonotone filter, this method has no demand on the penalty parameter which is difficult to obtain. Moreover,the restoration phase is not needed any more. Under reasonable conditions, we obtain the global convergence of the algorithm. Some numerical results are presented.
Haiyan Mao,Dingguo Zhou,Zaher Hashisho,Sunguo Wang,Heng Chen,Haiyan (Helena) Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The effect of flow rate, microwave power, and humidity of purge gas on microwave regeneration ofagricultural based activated carbon saturated with toluene and acetone was investigated. To comparewith microwave heating, conductive heating was also employed to follow the effect on adsorptioncapacity, regeneration ratio, desorption rate, time and energy consumption. Desorption rate of constantpower microwave heating was 32.9% per minute, which was 20 and 40 times higher than constanttemperature microwave and conductive heating, respectively. Energy consumption of microwaveheating (constant power) was only 4.5 kJ/g. Adsorption isotherms data can be well fitted with Dubinin–Radushkevich model.
A MODIFIED NONMONOTONE FILTER TRUST REGION METHOD FOR SOLVING INEQUALITY CONSTRAINED PROGRAMMING
Wang, Hua,Pu, Dingguo The Korean Society for Computational and Applied M 2011 Journal of applied mathematics & informatics Vol.29 No.3
SQP method is one of the most important methods for solving nonlinear programming. But it may fail if the quadratic subproblem is inconsistent. In this paper, we propose a modified nonmonotone filter trust region method in which the QP subproblem is consistent. By means of nonmonotone filter, this method has no demand on the penalty parameter which is difficult to obtain. Moreover, the restoration phase is not needed any more. Under reasonable conditions, we obtain the global convergence of the algorithm. Some numerical results are presented.
Axial compressive behavior of concrete-encased CFST stub columns with open composite stirrups
Ke, Xiaojun,Ding, Wen,Liao, Dingguo Techno-Press 2021 Advances in concrete construction Vol.12 No.5
The existing method to improve the coordination performance of the inner and outer parts of concrete-encased concrete-filled steel tube (CFST) composite columns by increasing the volume-stirrup ratio causes difficulties in construction due to over-dense stirrups. Thus, this paper proposes an open polygonal composite stirrup with high strength and high ductility CRB600H reinforced rebar, and seventeen specimens were constructed, and their axial compressive performance was tested. The main parameters considered were the volume-stirrup ratio, the steel tube size, the stirrup type and the stirrup strength. The test results indicated: For the specimens restrained by open octagonal composite stirrups, compared with the specimen of 0.5% volume-stirrup ratio, the compressive bearing capacity increased by 14.6%, 15.7% and 21.5% for volume-stirrup ratio of 0.73%, 1.07% and 1.61%, respectively. For the specimens restrained by open composite rectangle stirrups, compared with the specimen of 0.79% volume-stirrup ratio, the compressive bearing capacity increased by 7.5%, 6.1%, and -1.4% for volume-stirrup ratio of 1.12%, 1.58% and 2.24%, respectively. The restraint ability and the bearing capacity of the octagonal composite stirrup are better than other stirrup types. The specimens equipped with open polygonal composite stirrup not only had a higher ductility than those with the traditional closed-loop stirrup, but they also had a higher axial bearing capacity than those with an HPB300 strength grades stirrup. Therefore, the open composite stirrup can be used in practical engineering. A new calculation method was proposed based on the stress-strain models for confined concrete under different restrain conditions, and the predicted value was close to the experimental value.
Qinglin Wu,Fei Yao,Xinwu Xu,Changtong Mei,Dingguo Zhou 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Thermal degradation behavior of rice straw fibers under isothermal heating conditions was studied. The data were modeled by considering the fiber as one pseudo-component using the Malek method. The kinetic model with reaction order n > 1 [i.e., RO(n > 1) = (1-a)n] described the degradation process of rice straw fiber fairly well in a temperature range up to about 265 8C. The kinetic parameters used include activation energy of 116±5 kJ/mol, reaction order of 3.0±0.2, and logarithmic value of preexponential factor [ln A] of 18.7 ±0.1 ln s-1. The model obtained can be used to aid the development of straw fiber-engineering plastic composites.