http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Chunfa Li,Enmin Feng 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1-2
Parameter identification problem of a three species (predator, mutualist-prey, and mutualist) ecological system with reaction-diffusion phenomenon is investigated in this paper. The mathematical model of the parameter identification problem is constructed and continuous dependence of the solution for the direct problem on the parameters identified is obtained. Finally, the existence of optimal solution and an optimality necessary condition for the parameter identification problem are given.
OPTIMAL CONTROL OF SYSTEMS OF PARABOLIC PDES IN EXPLOITATION OF OIL
Li, Chunfa,Feng, Enmin,Liu, Jinwang 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.13 No.1
Optimal control problem for the exploitaton of oil is investigated. The optimal control problem under consideration in this paper is governed by weak coupled parabolic PDEs and involves with pointwise state and control constraints. The properties of solution of the state equations and the continuous dependence of state functions on control functions are investigated in a suitable function space; existence of optimal solution of the optimal control problem is also proved.
LI, CHUNFA,FENG, ENMIN 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1
Parameter identification problem of a three species (predator, mutualist-prey, and mutualist) ecological system with reaction-diffusion phenomenon is investigated in this paper. The mathematical model of the parameter identification problem is constructed and continuous dependence of the solution for the direct problem on the parameters identified is obtained. Finally, the existence of optimal solution and an optimality necessary condition for the parameter identification problem are given.
Leiting Sun,Jianqiang Tao,Chunfa Li,Shengkai Wang,Ziqiang Tong 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
The purpose of this paper is to optimize the signal timing through multi-agent simulation technology. Firstly, a conceptual model of the actual intersection is described. Secondly, the social dynamics model of the vehicle and pedestrian evolution rules are established from the micro perspective, which is simulated respectively by Anylogic and Synchro on this basis. Finally, the signal timing strategies for the different vehicle priorities are discovered through the heuristic algorithm. The case study shows that: ①The actual signal timing is not reasonable. ②The optimization strategies of signal timing can improve traffic efficiency. ③By comparing the signal timing strategies of different vehicle priority, the study shows that the Anylogic is more superior to the Synchro, which provides a new way to solve the traffic congestion.
Jiaqi Zeng,Wenchao Li,Min Lei,Chunfa Dong,Kui Zhou 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Polycaprolactone (PCL) exhibits limited applicability in the application of biological tissue engineering scaffolds due to its lower surface hydrophilicity and surface energy. In this paper, PCL crystal lamellae scaffolds with different surface roughness were fabricated by immersing electrostatic direct-written PCL scaffolds in PCL/Amyl acetate (AC) solution for 15 , 30 , 60 and 120 min, respectively, using solution incubation for crystallization. The rough scaffolds were subsequently coated with polydopamine (PDA) for 4 h, 8 h, 12 h and 16 h. Surface morphology, chemical properties and water contact angle tests were performed on both types of scaffolds. To evaluate the feasibility of the modified scaffold as a bionic scaffold, L929 mouse fibroblasts were inoculated on the surface of the scaffold and cultured for 1, 3 and 7 days. When compared to the untreated scaffolds, the surface of the scaffolds treated for 15 , 30 , 60 , and 120 min, respectively exhibited a distinct PCL crystal lamellae structure, accompanied by a significant increase in surface roughness and corresponding water contact angle elevation. In the cell experiments, the 30 min treatment group demonstrated superior cellular activity compared to the other experimental groups. The water contact angle of the PDA-modified scaffolds decreased over time with extended treatment durations, ultimately reaching 0°. In the cell experiments, the 8 h treatment scaffolds exhibited a more pronounced improvement in activity compared to the other groups. Based on these results, it can be concluded that the PDA-modified PCL crystal lamellae electrostatic direct-write scaffold promotes cell proliferation and differentiation, thereby facilitating tissue regeneration.