Passivity{based feedback controllers are derived for the indirect stabilization of the average output voltage in Pulse{Width{Modulation (PWM) controlled dc{to{dc power converters of the \boost", \buck{boost" and \buck" types. The controller design is carried out on the basis of well known average PWM models of such circuits. These models are shown to be Euler{Lagrange systems corresponding to a...

Building with a Memory is an experiential media system for capturing and representing dynamic human activity in a distributed workplace. Participants can perform purposefully, incidentally and unknowingly with the system, with individual and collective actions represented through a variety of ambient feedback mechanisms. Two iterations of the system are presented and observations and recommenda...

The simulation of organ-organ interaction is indispensable for practical and advanced medical VR simulator such as open surgery and indirect palpation. This paper gives a method to represent interaction between elastic objects i.e. organs in medical VR simulation. The proposed model defines displacements of colliding elements based on temporary surface forces caused by temporary displacements, ...

The paper presents a certainty equivalence indirect adaptive control design method for parametric strict feedback nonlinear systems of any relative degree with unmatched uncertainties in state and output feedback settings. The approach is based on the parameter identification (estimation) model, which is completely separated from the control design and is capable of producing parameter estimate...

Successful dialogue frequently requires that interlocutors construct and align their conceptualizations of referents. This study presents data from a referential communication experiment the manipulates contextual factors such as the availability of feedback and role constancy in order to investigate how conversational partners reconcile their perspectives in the face of mutual uncertainty abou...

Abstract: In this paper, we propose direct and indirect adaptive fuzzy sliding mode control approaches for a class of nonaffine nonlinear systems. In the direct case, we use the implicit function theory to prove the existence of an ideal implicit feedback linearization controller, and hence approximate it to attain the desired performances. In the indirect case, we exploit the linear structure ...

For efficient polarity and migration, cells need to regulate the magnitude and spatial distribution of actin assembly. This process is coordinated by reciprocal interactions between the actin cytoskeleton and mechanical forces. Actin polymerization-based protrusion increases tension in the plasma membrane, which in turn acts as a long-range inhibitor of actin assembly. These interactions form a...

Feedback from community interactions involving mutualisms are a rarely explored mechanism for generating complex population dynamics. We examined the effects of two linked mutualisms on the population dynamics of a beetle that exhibits outbreak dynamics. One mutualism involves an obligate association between the bark beetle, Dendroctonus frontalis and two mycangial fungi. The second mutualism i...

This study aims to examine the types of written feedback given by teachers on writing eleventh-grade senior high school students at SMA Tarbiyah Islamiyah. The instrument used was document analysis type English teacher results tenth-grade majoring in Social Sciences (IPS) and Natural (IPA). findings revealed that two different students' writing. Teachers who teach Science major tend use direct ...