Noninteracting Control Research Articles

Effects of interactive computer erotica on men's attitudes and behavior toward women: an experimental study

The purpose of this study was to examine antiwomen attitudes and behaviors in men as a function of the use of interactive erotica, moderated by the men's initial affective disposition toward sexuality. A total of 100 first year university men were exposed to either (a) neutral, noninteractive (control) stimuli, (b) erotic, noninteractive stimuli, (c) erotic, moderately interactive stimuli, or (d) erotic, highly interactive stimuli on a personal computer. Prior to this manipulation, participants' levels of erotophobia-erotophilia were assessed. After exposure to the manipulation, participants' attitudes toward women, rape myth acceptance, and level of aggressive behavior in response to a female confederate's provocation were assessed. In addition, participants' keyboard activity and self-reported levels of sexual arousal were recorded and analyzed. Results showed that the erotic stimuli resulted in much interactive activity and in significant amounts of sexual arousal, but use of computer pornography by participants did not affect any of the measures of attitudes or behavior toward women in comparison with the control condition and regardless of participants' affective orientation to sexuality. Implications for theory and research on computer-mediated exposure to pornography are discussed.

Generalized Controlled Invariance for Nonlinear Systems

A general setting is developed which describes controlled invariance for nonlinear control systems and which incorporates the previous approaches dealing with controlled invariant (co -) distributions. A special class of controlled invariant subspaces, called controllability cospaces, is introduced. These geometric notions are shown to be useful for deriving a (geometric) solution to the dynamic disturbance decoupling problem and for characterizing the so-called fixed dynamics for noninteracting control. These fixed dynamics are a central issue in studying noninteracting control with stability. The class of quasi-static state feedbacks is used.

Soft and safe admission control in cellular networks

We study the mobile admission control problem in a cellular PCS network where transmitter powers are constrained and controlled by a distributed constrained power control (DCPC) algorithm. Receivers are subject to nonnegligible noise, and the DCPC attempts to bring each receiver's CIR (carrier-to-interference ratio) above a given quality target. Two classes of distributed admission control are considered. One is a noninteractive admission control (N-IAC), where an admission decision is instantaneously made based on the system state. The other is an interactive admission control (IAC), under which the new mobile is permitted to interact with one or more potential channels before a decision is made. The algorithms are evaluated with respect to their execution time and their decision errors. Two types of errors are examined: type I error, where a new mobile is erroneously accepted and results in outage; and type II error, where a new mobile is erroneously rejected and results in blocking. The algorithms in the N-IAC class accept a new mobile if and only if the uplink and the downlink interferences are below certain corresponding thresholds. These algorithms are subject to errors of type I and type II. In the IAC class, we derive a soft and safe (SAS) admission algorithm, which is type I and type II error free, and protects the CIR's of all active links at any moment of time. A fast-SAS version, which is only type I error-free, is proposed for practical implementation, and is evaluated in several case studies.

Noninteracting control of descriptor systems involving disturbances

For m-input p-output descriptor systems involving disturbances, it is proven that if the problem of disturbance rejection is solvable via static-state feedback and the input-output transfer function matrix is right invertible, there always exists a static-state feedback control law yielding, simultaneously to disturbance rejection, a triangular input-output relation. The structural properties of the closed-loop system (stability, pole assignment, etc.) are extensively studied.

On Control of Coupled Map Lattices: Using Local Dynamics to Predict Controllability

We consider the problem of achieving global stabilisation, using local, non-interacting control of a coupled map lattice at the same unstable fixed point on each site. In particular, a probabilistic model is described for the transition from full controllability to partial controllability as the coupling parameter is increased from zero. The phase transition aspect of this change in the controllability behaviour is recovered by using a statistical model derived from the coupling map. We exemplify our approach by considering coupled map lattices with logistic and Arn'old circle map dynamics. Numerical experiments detecting the phase transition are compared with use of the model developed in this letter.

Feedback control of affine nonlinear singular control systems

This paper discusses feedback control problems for affine nonlinear singular systems. Namely, the problems of regularization (regular singular systems have for a particular initial state and input, a unique solution), non-interaction and exact linearization. First, an algorithm providing necessary and sufficient conditions for the regularizability of the affine nonlinear singular systems is introduced. This algorithm resembles the well-known constrained dynamics algorithm for affine nonlinear systems. For regularizable affine nonlinear singular systems, necessary and sufficient conditions for the solvability of the non-interacting control problem are derived. They are based on another algorithm producing a sequence of integers, the generalization of the well known notion of relative degree for usual affine nonlinear systems. Finally, the problem of feedback exact linearization of the dynamic part of singular systems is briefly addressed. An example is provided to illustrate the main results.

Flexible piezoelectric structures-approximate motion equations and control algorithms

Continuous-time and discrete-time algorithms are proposed to control a thin piezoelectric structure which can be described by means of approximate linear time-invariant dynamic models. Generalized coordinates are introduced to approximately represent the kinematics of the structure in a polynomial form; the approximate motion equations are determined by the application of the integral Hamilton principle in the Lagrangian form. The proposed control laws are designed on the basis of the obtained continuous-time and discrete-time approximate dynamic models; they guarantee the gravity force compensation, the noninteracting control of the generalized coordinates, and the asymptotic tracking of reference signals. Simulation results confirming the theoretical effectiveness of the algorithms are reported in the paper.

Development of the production of high thickness-uniformity sheet in the new tandem cold strip mill at Kashima Steel Works

The new cold strip mill at Kashima Steel Works has been designed for high-thickness uniformity and strip flatness. Stands 1 to 3 use the pair-cross technology. For the gauge accuracy in the longitudinal direction, an advanced AGC system combining newly developed technologies is used. It is characterized by a non-interactive control of gauge and tension. Strip profile is mainly controlled at the three PC stands. A numerical simulation model of profile and flatness is used to optimize the setting of the actuators. The system can operate in two modes : “flatness” mode or “edge drop-free” mode.

Noninteracting Control for a Class of Nonlinear Differential-Algebraic Systems

This paper concerns nonlinear singular systems defined by a class of nonlinear differential-algebraic equations. Assumptions are given first for which initial value problem and the procedure of nonlinear coordinates transformation are well posed. The problem of noninterating control with internal stability via static state feedback is stated. Noninteracting control feedback law is then presented. An algorithmic procedure is developed to obtain the manifold on which there exists a unique differentiate solution to the closed-loop system. The conditions for local internal stability of a single equilibrium solution are indicated. Nonintercating control problem of the DAE systems is solved based on the framework.

Tension Control of a Hot Strip Mill Finisher

This paper describes interstand tension control by looper and looper less tension control of a hot strip mill finisher. The looper tension control methods are conventional, non-interactive, LQ (Linear Quadratic), H∞, and ILQ(Inverse Linear Quadratic) control.

Controllability Through Active Forces in Cooperating Robots with General Payloads

A control-oriented formalism has been introduced by the authors for the modeling of multiple cooperating robots with different types of contacts and handling general payloads, including also payloads with extra degrees of freedom. The extra degrees of freedom of a cooperating robotic system are the generalized coordinates needed to characterize the payload configuration when the end-effector pose of each robot is kept fixed. While the modeling steps give an explicit characterization of this extra dynamics, from the control point of view we face the impossibility of assigning a desired dynamic behavior to the whole system. In particular, when designing active forces in the cooperation task for tracking some output motion trajectories, one should consider also the problem of internal stability of the closed-loop system. With the help of two simple case studies (a linear and a nonlinear one), we examine some possible control approaches that solve the problem for the given class of mechanical systems. The theory of output regulation and that of nonlinear noninteracting control with stability, turn out to be useful in this framework.

Essential Orders and Nonlinear Discrete-Time Decoupling

The concept of essential orders, recently introduced in continuous-time, is here extended to the nonlinear discrete-time context. On this basis it is shown how to compute a minimum order compensator for solving the restricted noninteracting control problem for right-invertible submersive systems.

機械的な非線形性を考慮した誘導モータの非干渉制御

機械的な非線形性を考慮した誘導モータの非干渉制御

Fixed Modes in Quasi-Static State Feedback Decoupling

We consider the problem of noninteracting control with stability for a square affine nonlinear system, whose its decoupling matrix is not necessarily invertible. The recent notion of quasi-static state feedback is used. The results of this paper show that the dimension of the fixed dynamics with respect to any quasi-static state feedback may be determined by using the so-called controllability cospaces.

Finite element design of manipulator-coupled spacecraft for a research testbed

This paper describes the design and analysis of a research testbed developed to study the control of manipulator-coupled spacecraft with independent attitude control systems. This scenario could present itself in the assembly of Space Station Freedom (SSF). SSF assembly calls for a rendezvous of the Space Shuttle (SS) with SSF. Part of the assembly process requires that both spacecraft be coupled via the Space Shuttle Remote Manipulator System. An additional criterion that poses increased complexity is that the Space Shuttle controls and Space Station controls can not communicate. The technical issue involved is unwanted vibrations of the coupled-configuration that occur retraction and the complications due to non-interacting control systems. To understand these vibrations and possible complications, a research testbed has been built at the Marshall Space Flight Center in Huntsville, AL.

Multivariable non-interacting control of plasma configuration in JT-60U

A multivariable non-interacting control technique has been applied to the configuration control of single-null divertor plasmas in JT-60U. Strong interactions between the controls of the plasma current and the plasma horizontal position—which inevitably occur during their independent control, owing to large inductive coupling between the ohmic heating coil and vertical magnetic field coil—have been drastically suppressed by adopting the non-interacting control. The multivariable non-interacting control technique is a general method and can be applied to any tokamak machine, including tokamak fusion reactors such as ITER. Poloidal field coil currents and voltages required for configuration control in ITER-CDA have been investigated using this control algorithm.

Headbox modelling for cross-direction basis weight control

This paper considers the representation of cross-directional (CD) basis weight on paper machines where the two-dimensional (2D) coupling between CD and machine direction (MD) is important and must be controlled. Indeed, because the flow pattern from the headbox exhibits 2D interactive behaviour, any simple non-interacting CD control model must be inadequate, hence the need for appropriate models. One solution, short of a complex hydrodynamic model, is to provide the necessary control structure with a function representing the interaction determined by considering the behaviour of the flow field. From a 2D control point of view, the mean of the control signal would relate strongly to the MD controller, with the rest being the CD controller. It thus should be possible to contrive a 2D control strategy for the headbox system based essential upon the modelling work shown here.

A new System Structure Theory. Application to System Properness

A new definition is proposed for the concept of structure at infinity. To each input component is attached a rational integer, which, for a single input single output system defined by a single differential equation, is the difference between the the order in the output and the order in the input of the differential equation defining the system. The m-tuple of these rational integers is the new structure at infinity of the system, m stands for the number of input components. Associated to the structure at infinity is also defined a p-tuple of rational integers representing a new notion of essential structure. The old structure at infinity is shown to be recoverable through the new one. The new definition is intrinsic in the sense that it does not depend neither on an algorithm which serves to compute the structure at infinity and the essential structure, nor on a particular set of differential equations used to define the system. Moreover, the new notions are not tied to affine control systems, they fit well for any differential algebraic system, in state form, or in input output form, or even with general latent variable. An algorithm for computing the structure at infinity and the essential structure for arbitrary differential algebraic systems is also proposed. In this paper the new theory is applied to the longstanding problem of a satisfactory definition of system properness. A system is said to be proper if its structure at infinity consists of natural integers. This may look abstract but results are presented that make it sound like a good candidate for system propemess definition. In forthcoming publications, the new system structure theory is applied to the basic noninteracting control problems.

High Input Impedance All-Pass Circuit

A novel operational transconductance amplifier (OTA) based all-pass (AP) circuit exhibiting essentially infinite input impedance and facilitating non-interactive electronic control of gain and phase without disturbing the AP condition is proposed. A large amount of gain is attainable from the circuit as the scale factor is a function of the product of transfer gain (gm) of OTA and grounded resistor which can be made voltage variable. The circuit can also be made digitally programmable by controlling the bias currents of OTAs with DAC.

Parameterization of decoupling control laws for affine nonlinear systems

The problem of parameterizing all the decoupling feedbacks is investigated and applied to the design of a stable noninteracting control for affine nonlinear systems. An algebraic study of controlled invariance is presented. It covers a new criterion for controlled invariance, parameterization and novel properties of the friend set, and computational aspects of the maximal controlled invariant distribution. This analysis is used to derive Falb-Wolovich-like conditions for general decoupling (including disturbance decoupling and noninteracting control) problems. It is shown that to determine all the decoupling feedbacks one usually needs infinitely many (sets of) controlled invariant or controllability distributions that can arise as solutions to the problems. It is also shown that under certain conditions, stable noninteracting design based on first parameterizing the decoupling feedbacks is still a feasible approach in the sense that a feedback can be chosen from the friend set of the maximal solution for the exponentially stable and noninteracting design problem.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>