Based on the actual experiment signals of draft tube, the correlation dimension analysis has been carried on using the time domain signals. Through correlation dimension analysis of pressure fluctuating under different load, the results indicate that the pressure fluctuation conditions in draft tube are not same under different load, the corresponding fractal correlation dimensions are also dif...

오늘날 수면의학 분야에서 널리 사용되는 수면기( s l e e p stage) 구분은 1 9 6 8년도에 뇌파(EEG), 안전도( E O G ) , 근전도( E M G )를 중심으로 정리된 기준으로서 이 기준에 의 해 각성-수면 상태를 각성-수면1기-수면2기-수면3기-수면4 기R E M수면으로 구분한다. , 2 이 기준에 따른 구분은 어느 정도의 생리적 상태를 반영하기도 하고 기초 수면의학 연구 와 임상 수면장애 진료에 도움을 주지만 이것은 수면의 각 상태를 눈에 보이는 뇌파 파형에 따라 분류하고 이름짓고 정 리하는 것이고, 뇌에서 일어나는 생리적 상태와 의미를 직접 적으로 반영하는 구분은 아니다. Coenen은 의식과 신경계 에 대한 고찰에서 이러한 측면을 고려하여 각기 다른 의식 상태를 생리적으로 ...

A simple continuous nonlinear model of the human cardiovascular system (CVS) is investigated while focusing on the simulated achieved blood pressure (BP) signal. The beat-to-beat version of this model, introduced by DeBoer et. al. was a simplified linearized version. We present a modified model, which allows investigating the nonlinear dynamics of the CVS and the effect of variations in several...

The authors thank Schertzer et al. (2002) for their comment on their work (Sivakumar et al., 2001) on the investigation of the possible presence of low-dimensional chaotic behaviour (the term "chaos" was used therein to denote the low-dimensional chaos) in the rainfall-runoff process in the Gôta River basin in Sweden. The authors respond to this discussion with respect to: (a) the purpose of th...

We introduce an algorithm for nonlinear noise reduction which is based on locally linear ts to the nonlinear dynamics. We claim that it is both robust and exible enough to apply it to a variety of experimental time series. In the second part of the paper we show its performance on data set A. The correlation dimension, Liapunov exponent and the Poincar e map are computed before and after the no...

The spatial patterns and processes of cities can be described with various entropy functions. However, spatial entropy always depends on the scale of measurement, and it is difficult to find a characteristic value for it. In contrast, fractal parameters can be employed to characterize scale-free phenomena and reflect the local features of random multi-scaling structure. This paper is devoted to...