The coupled evolution of land plants, CO2, and climate over the last half billion years has maintained atmospheric CO2 concentrations within finite limits, indicating the involvement of a complex network of geophysiological feedbacks. But insight into this important regulatory network is extremely limited. Here we present a systems analysis of the physiological and geochemical processes involve...

33 rd CDC Abstract. This paper brings together results from a number of diier-ent areas in control theory to provide an algorithm for the synthesis of locally exponentially stabilizing control laws for a large class of driftless nonlinear control systems. The exponential stabilization relies on the use of feedbacks which render the closed loop vector eld homogeneous with respect to a dilation. ...

This paper presents an algorithmic design for opinion extractor from free-form course feedback texts. An unsupervised lexicon-based based algorithmic formulation is designed and implemented for identifying opinion polarity from free-form textual feedbacks written by students. The performance of the algorithm is evaluated on two different course feedback datasets obtained from ratemyprofessor we...

While it is true that the physical principles and equations discussed in part one do form the “core” of any atmospheric or climate model, there are processes in the observed system that are difficult to represent due to our incomplete understanding of the process, or the fact that some processes are not exact. Many of these processes are what we call “feedbacks”. Feedbacks are manifestations of...

An approach to climate change feedback analysis is described in which tropospheric relative humidity replaces specific humidity as the state variable that, along with the temperature structure, surface albedos, and clouds, controls the magnitude of the response of global mean surface temperature to a radiative forcing. Despite being simply a regrouping of terms in the feedback analysis, this al...

The authors argue for the hypothesis that interactive feedbacks involving surface enthalpy fluxes are important to the dynamics of tropical intraseasonal variability. These include cloud-radiative feedbacks as well as surface turbulent flux feedbacks; the former effectively act to transport enthalpy from the ocean to the atmosphere, as do the latter. Evidence in favor of this hypothesis include...

Planning systems need to be endowed with some additional features to cope effectively with execution: e.g., the ability to keep the plan database updated with respect to the actual feedbacks provided by the controlled system, to mention but one. In this paper, we identify a set of noteworthy planning and execution open issues relatively to the timeline-based planning approach. We address those ...

This paper describes a strategy to integrate game programming into the computer science curriculum. It is a well known challenge that nationally computer science/computer engineering enrollment is at its lowest in at least a decade. Many approaches have been implemented during past few years and game programming is one of those showing positive feedbacks. In this paper utilizing the game progra...

Current optimization algorithms are designed for problems in which explicit fitness functions are provided. They can not be directly applied to problems where fitness functions do not exist, such as a situation where a user can interact with the computer by providing vague feedbacks instead of specific fitness. This paper proposes a population-based algorithm to solve such an optimization probl...

This paper investigates the use of nonregular (not necessarily regular) static/dynamic state feedbacks to achieve feedback linearization of affine nonlinear systems. First, we provide an example which is nonregular static feedback linearizable but is not regular dynamic feedback linearizable. Then, we present some necessary conditions as well as sufficient conditions for nonregular feedback lin...