A number of geometric active contour and surface models have been proposed for shape segmentation in the literature. The essential idea is to evolve a curve (in 2D) or a surface (in 3D) so that it clings to the features of interest in an intensity image. Several of these models have been derived, using a variational formulation, as gradient flows which minimize or maximize a particular energy f...

Actor-based languages attract attention for their ability to scale to highly parallel architectures. Active objects combine the asynchronous communication of actors with object-oriented programming by means of asynchronous method calls and synchronization on futures. However, the combination of asynchronous calls and synchronization introduces communication cycles which lead to a form of commun...

A novel approach to visual servoing is presented, which takes advantage of the structure of the Lie algebra of aane transformations. The aim of this project is to use feedback from a visual sensor to guide a robot arm to a target position. The sensor is placed in the end eeector of the robot, thècamera-in-hand' approach, and thus provides direct feedback of the robot motion relative to the targ...

This paper develops a non-contact active feedback control of web flutter in a narrow passage by using movable plates set at inlet and outlet of the passage. The strategy of this active feedback control is based on the flow-control which cancels the exciting fluid force acting on the web, i.e., cancels the self-excited feedback mechanism. In this paper, suppression of the web flutter by the acti...

In this paper we study a previously developed linearized model of TCP and AQM. We use classical control system techniques to develop controllers weU suited for the application. The controllers are shown to have better theoretical properties than the wetll known RED controller. We present gnidetines for designing stable controllers subject to network parameters tike load level, propagation delay...

This paper presents the LQ-Servo control with observer for TCP/AQM system. In order to estimate the state of TCP window packet size, the control structure is extended with observer based on Kalman filter.

Wireless channels have the characteristic that the link quality varies with propagation conditions. For real-time flows with hard time deadlines, link layer retransmissions over the wireless network due to fluctuations in link quality may result in many packets being dropped due to deadline expiry. The expired packets waste network resources and lead to long queuing delay for subsequent packets...

The transition of a standard thin disk to a radiatively inefficient accretion flow (RIAF) is expected to occur, when its accretion rate ṁ is lower than the critical value ṁcrit (ṁ = Ṁ/ṀEdd). The RIAF is very hot, and it radiates mostly in the hard X-ray band (& 100 keV). Assuming that the accretion disk in every bright active galactic nucleus (AGN) will finally undergo a RIAF phase while ṁ < ṁc...