A cost-function approach to stabilization by output feedback

We present a simple cost-function approach to the stabilizability of linear time-invariant systems by output feedback. It makes use of a method of Berger (1982) for obtaining the largest hypersphere containing only polynomials that are stable.     

Invariance of strict aperiodicity for systems with dependent perturbations

A useful measure of robustness for strictly aperiodic systems with dependent perturbations is to find the largest polytope in parameter space centred on the nominal system that still ensures the strict aperiodic property. This paper presents a graphical approach to obtain the largest prescribed polytope of strictly aperiodic polynomials.     

Task-oriented design of hybrid dynamic systems

This paper proposes a task-oriented design approach for hybrid dynamic systems. The main idea is to distribute the task of the whole system hierarchy by hierarchy, from the highest level, which is the whole system, to the lowest level, which are continuous variable dynamic systems. The controller of each subsystem at each level is designed to divide its subtask into subsubtasks and distribute them to its own subsystem. At the same time, it informs the controller at a higher level of its capability.     

Frequency domain criteria for robust stability of perturbed systems with uncoupled variations in odd and even coefficients

Sets of (characteristic) polynomials with uncoupled variations in odd and even coefficients arise when systems experience parameter variations. This paper derives frequency domain criteria for robust stability of polynomial sets with uncoupled variations in odd and even coefficients. The frequency domain criteria only require one frequency domain plot to check the robustness of polynomial sets with uncoupled variations in odd and even coefficients. Furthermore, the largest stable polynomial set can be graphically estimated from the same frequency domain plot     

Necessary and sufficient condition for the existence of Kharitonov-like theorems

Kharitonov has shown that a family of interval polynomials is Hurwitz if and only if the vertex polynomials are Hurwitz. A necessary and sufficient condition to check the existence of Kharitonov-like theorems for other regions of interest in the complex plane is presented.     

A systematic approach in load disaggregation utilizing a multi-stage classification algorithm for consumer electrical appliances classification

The potential to save energy in existing consumer electrical appliances is very high. One of the ways to achieve energy saving and improve energy use awareness is to recognize the energy consumption of individual electrical appliances. To recognize the energy consumption of consumer electrical appliances, the load disaggregation methodology is utilized. Non-intrusive appliance load monitoring (NIALM) is a load disaggregation methodology that disaggregates the sum of power consumption in a single point into the power consumption of individual electrical appliances. In this study, load disaggregation is performed through voltage and current waveform, known as the V-I trajectory. The classification algorithm performs cropping and image pyramid reduction of the V-I trajectory plot template images before utilizing the principal component analysis (PCA) and the k-nearest neighbor (k-NN) algorithm. The novelty of this paper is to establish a systematic approach of load disaggregation through V-I trajectory-based load signature images by utilizing a multi-stage classification algorithm methodology. The contribution of this paper is in utilizing the “k-value,” the number of closest data points to the nearest neighbor, in the k-NN algorithm to be effective in classification of electrical appliances. The results of the multi-stage classification algorithm implementation have been discussed and the idea on future work has also been proposed.     

广义Nash平衡点和切换控制在对策论中的应用

通过把平衡点和决策者的动机耦合的方法,提出了广义纳什平衡点这一新概念.决策者的动机通常有两类：一是最大化自己的利益,另一则是最大化对手的利益.如果每一个决策者的动机都是第一类,一个理性的群体就会形成,整个系统最终会达到第一类平衡点（也就是经典的纳什平衡点）.如果每一个决策者的动机都是第二类,一个有智慧的群体就会形成,整个系统最终会达到第二类平衡点.同时,切换控制被用来帮助决策者确定他们的动机.     

Frequency domain criteria for strict aperiodicity of linear interval systems

Interval systems arise when systems experience parameter variations. This paper derives frequency domain criteria for interval systems to be strictly aperiodic. The frequency domain criteria only requires one frequency domain plot to check for strict aperiodicity of linear interval systems. Furthermore, the largest allowable perturbation bounds can be graphically estimated from the same frequency domain plot.     

A simple approach to stabilization of discrete-time systems by output feedback

We present a simple cost-function approach to the stabilizability of linear discrete-time systems by output feedback. It makes use of new stability theorems involving the coefficients of the characteristic polynomial.