Papers by nikolay sirakov
Power System Voltage Stability Assessment Using Enhanced Power Flow Models
Electric Power Components and Systems, 2001
ABSTRACT This paper presents an enhanced method for power system voltage stability assessment. Ke... more ABSTRACT This paper presents an enhanced method for power system voltage stability assessment. Key features of this method are the inclusion of the characteristics of key dynamic devices and an efficient method to solve the associated algebraic and differential equation sets in steady-state conditions. It offers an accurate representation of equipment operating characteristics for voltage stability margin calculation. The importance of the proposed modeling approach is demonstrated with simulation results.
A New Active Convex Hull Model for Image Regions
Journal of Mathematical Imaging and Vision, 2006
This paper presents a new active convex hull model with the following advantages: invariant with ... more This paper presents a new active convex hull model with the following advantages: invariant with respect to the number of pixels to be enveloped; the number of time iterations is invariant, with respect to the image size; time-cheap for large image regions. The model is based on the geometric heat differential equations, derived from parabolic equation, and parameterized by arc
Une sequence du paleolithique inferieur au paleolithique recent dans les balkans: la grotte kozarnika a orechets (nord-ouest de la bulgarie)
... 5 : Laboratoire des sciences du climat et de l&am... more ... 5 : Laboratoire des sciences du climat et de l'environnement (LSCE). CNRS : UMR1572 INSU CEA : DSM/LSCE Université de Versailles-Saint Quentin en Yvelines Institut Pierre Simon Laplace. 6 : Geophysical institute. Bulgarian Academy of Sciences. ...
Multimodal user interfaces, 2008
Affective and human-centered computing have attracted a lot of attention during the past years, m... more Affective and human-centered computing have attracted a lot of attention during the past years, mainly due to the abundance of environments and applications able to exploit and adapt to multimodal input from the users. The combination of facial expressions with prosody information allows us to capture the users' emotional state in an unintrusive manner, relying on the best performing modality in cases where one modality suffers from noise or bad sensing conditions. In this paper, we describe a multi-cue, dynamic approach to detect ...
Multimodal user interfaces, 2008
Affective and human-centered computing have attracted a lot of attention during the past years, m... more Affective and human-centered computing have attracted a lot of attention during the past years, mainly due to the abundance of environments and applications able to exploit and adapt to multimodal input from the users. The combination of facial expressions with prosody information allows us to capture the users' emotional state in an unintrusive manner, relying on the best performing modality in cases where one modality suffers from noise or bad sensing conditions. In this paper, we describe a multi-cue, dynamic approach to detect ...
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Papers by nikolay sirakov