In this note we study the optimal dividend problem for a company whose surplus process, in the absence of dividend payments, evolves as a generalized compound Poisson model in which the counting process is a generaliz...In this note we study the optimal dividend problem for a company whose surplus process, in the absence of dividend payments, evolves as a generalized compound Poisson model in which the counting process is a generalized Poisson process. This model includes the classical risk model and the Pólya-Aeppli risk model as special cases. The objective is to find a dividend policy so as to maximize the expected discounted value of dividends which are paid to the shareholders until the company is ruined. We show that under some conditions the optimal dividend strategy is formed by a barrier strategy. Moreover, two conjectures are proposed.展开更多
The interaction between the high pressure gas and the control fluid and the movement mechanism of the control fluid in compound perforation were studied by a series of large-scale experiments, where the movement behav...The interaction between the high pressure gas and the control fluid and the movement mechanism of the control fluid in compound perforation were studied by a series of large-scale experiments, where the movement behavior of the control fluid was observed. The curves of measured pressure were analyzed, a mathematical model for the rigid movement of the control fluid was established, and the movement velocity of control fluid was analyzed. Moreover, the velocity from experimental results and velocity from an analytical solution were contrasted. The movement of the control fluid in the initial stage was similar to the rigid movement; however, the propagation of the pressure wave in the control fluid should be taken into account. Experimental results are significant for research on the movement mechanism of control fluid in compound perforation.展开更多
Conventional moving target detection focuses on algorithms to improve detection efficiency. These algorithms pay less attention to the image acquisition means, and usually solve specific problems. This often results i...Conventional moving target detection focuses on algorithms to improve detection efficiency. These algorithms pay less attention to the image acquisition means, and usually solve specific problems. This often results in poor flexibility and reus- ability. Insect compound eyes offer unique advantages for moving target detection and these advantages have attracted the attention of many researchers in recent years. In this paper we proposed a new system for moving target detection. We used the detection mechanism of insect compound eyes for the simulation of the characteristics of structure, control, and function. We discussed the design scheme of the system, the development of the bionic control circuit, and introduced the proposed mathe- matical model of bionic cqmpound eyes for data acquisition and object detection. After this the integrated system was described and discussed. Our paper presents a novel approach for moving target detection. This approach effectively tackles some of the well-known problems in the field of view, resolution, and real-time processing problems in moving target detection.展开更多
针对传统PI(Proportional-Integral)控制无法从根本上解决静态和动态性能之间、跟踪设定值与抑制扰动能力之间存在的矛盾,提出一种新的交流感应电机控制算法,即采用小脑模型神经网络CMAC(Cerebellar Model Articulation Controller)和PI...针对传统PI(Proportional-Integral)控制无法从根本上解决静态和动态性能之间、跟踪设定值与抑制扰动能力之间存在的矛盾,提出一种新的交流感应电机控制算法,即采用小脑模型神经网络CMAC(Cerebellar Model Articulation Controller)和PID(Proportional-Integral-Differential)组成的复合控制器实现系统前馈反馈控制,以取代传统的双环控制系统中的转速外环PI控制器.在此基础上给出基于32位单片机MC68332的PWM(Pulse-Width Modulation)算法,实现交流感应电动机调速.Matlab仿真结果表明,运用CMAC控制方法的系统具有响应快、超调小、鲁棒性好的特点,较常规PI控制具有更好的动、静态性能.展开更多
文摘In this note we study the optimal dividend problem for a company whose surplus process, in the absence of dividend payments, evolves as a generalized compound Poisson model in which the counting process is a generalized Poisson process. This model includes the classical risk model and the Pólya-Aeppli risk model as special cases. The objective is to find a dividend policy so as to maximize the expected discounted value of dividends which are paid to the shareholders until the company is ruined. We show that under some conditions the optimal dividend strategy is formed by a barrier strategy. Moreover, two conjectures are proposed.
文摘The interaction between the high pressure gas and the control fluid and the movement mechanism of the control fluid in compound perforation were studied by a series of large-scale experiments, where the movement behavior of the control fluid was observed. The curves of measured pressure were analyzed, a mathematical model for the rigid movement of the control fluid was established, and the movement velocity of control fluid was analyzed. Moreover, the velocity from experimental results and velocity from an analytical solution were contrasted. The movement of the control fluid in the initial stage was similar to the rigid movement; however, the propagation of the pressure wave in the control fluid should be taken into account. Experimental results are significant for research on the movement mechanism of control fluid in compound perforation.
基金The work presented in this paper is supported by the Scholarship for International Young Scientists of NSFC (National Natural Science Foundation of China) (1D: 41050110441).
文摘Conventional moving target detection focuses on algorithms to improve detection efficiency. These algorithms pay less attention to the image acquisition means, and usually solve specific problems. This often results in poor flexibility and reus- ability. Insect compound eyes offer unique advantages for moving target detection and these advantages have attracted the attention of many researchers in recent years. In this paper we proposed a new system for moving target detection. We used the detection mechanism of insect compound eyes for the simulation of the characteristics of structure, control, and function. We discussed the design scheme of the system, the development of the bionic control circuit, and introduced the proposed mathe- matical model of bionic cqmpound eyes for data acquisition and object detection. After this the integrated system was described and discussed. Our paper presents a novel approach for moving target detection. This approach effectively tackles some of the well-known problems in the field of view, resolution, and real-time processing problems in moving target detection.
文摘针对传统PI(Proportional-Integral)控制无法从根本上解决静态和动态性能之间、跟踪设定值与抑制扰动能力之间存在的矛盾,提出一种新的交流感应电机控制算法,即采用小脑模型神经网络CMAC(Cerebellar Model Articulation Controller)和PID(Proportional-Integral-Differential)组成的复合控制器实现系统前馈反馈控制,以取代传统的双环控制系统中的转速外环PI控制器.在此基础上给出基于32位单片机MC68332的PWM(Pulse-Width Modulation)算法,实现交流感应电动机调速.Matlab仿真结果表明,运用CMAC控制方法的系统具有响应快、超调小、鲁棒性好的特点,较常规PI控制具有更好的动、静态性能.