Showing papers on "Crossover published in 1981"
114 citations
TL;DR: In this article, the variances of contrasts among direct, residual, and cumulative treatment effects are compared for a variety of two-treatment crossover designs, and the contrasts among second-order residual effects and among direct-by-period and direct by first-order-residual interaction effects are also considered.
Abstract: The variances of contrasts among direct, residual, and cumulative treatment effects are compared for a variety of two-treatment crossover designs. Estimation of contrasts among second-order residual effects and among direct-by-period and direct-by-first-order-residual interaction effects is also considered.
107 citations
TL;DR: In this paper, the condensation of dynamical monopoles and their strings is proposed as the mechanism responsible for the rapid crossover from weak to strong coupling in SU(2) lattice gauge theory.
Abstract: We propose the condensation of dynamical monopoles and their strings as the mechanism responsible for the rapid crossover from weak to strong coupling in SU(2) lattice gauge theory. By adding to the Wilson action a chemical potential for monopole formation, we are able to study the crossover in an extended phase plane. We find a critical value for the potential, related to the transition in a dual Ising model, above which monopoles are absent. Support for this picture is garnered from Monte Carlo simulations.
38 citations
Patent•
21 Sep 1981
TL;DR: In this article, a multiband analog audio processor is described which provides low peak-to-r.m.s. ratios and a distributed crossover configuration which employs bandpass filters with embedded clippers for high frequency processing.
Abstract: A multiband analog audio processor is described which provides low peak-to-r.m.s. ratios. A distributed crossover configuration is described which, in the presently preferred embodiment, employs bandpass filters with embedded clippers for high frequency processing. Circuits for improved distortion performance of the distributed crossover configuration is also described. An economical series/parallel crossover configuration with favorable summation properties is also set forth.
35 citations
TL;DR: The results of these studies reaffirm the value of the crossover method of evaluating analgesics.
Abstract: Ten years ago, analgesics were studied using crossover designs. In recent years, analgesics have been studied only in parallel designs primarily because biostatisticians do not like crossover studies. The advantages of crossover studies are numerous: (1) patients serve as their own control; (2) there is less variability of responses among patients; and (3) a smaller number of patients is needed to provide statistically significant data. As long as crossover of treatment medications does not occur within 4 to 6 hours, the problem of carryover effect of the previous medication is insignificant or negligible. Two studies will be presented. One is a crossover study of Percodan with and without naloxone to placebo. The other is a parallel study comparing the effects of propoxyphene with naloxone to those of propoxyphene alone. The results of these studies reaffirm the value of the crossover method of evaluating analgesics.
32 citations
Journal Article•
24 citations
22 citations
01 May 1981
TL;DR: Task network modeling is shown to be a powerful tool for the evaluation of manned systems in that it yields not only performance data but also estimates about operator work load.
Abstract: Two alternative instrumentations for a submarine, one including predictive information, are evaluated in a theoretical study. The analytical tools were a combination of the crossover model and task network models. Model validation is performed by subsequent experiments in a part task simulator. Average experimental results agree qualitatively with those of the theoretical study while excellent quantitative matching can be stated for the best experimental data. The predictor display turns out to be superior in all respects. Task network modeling is shown to be a powerful tool for the evaluation of manned systems in that it yields not only performance data but also estimates about operator work load.
11 citations
TL;DR: A Bayesian solution to the analysis of crossover designs for the comparison of two treatments, A and B7 when each individual states a preference for either A or B is presented.
Abstract: In crossover designs for the comparison of two treatments, A and B7 each individual receives both treatments in a randomized order. We present a Bayesian solution to the analysis of such designs when each individual states a preference for either A or B. Comparison is made with other analyses of this case and with the related binary response models of Cox (19587 Biometrika 45, 562-565) and Gart (1969, Biometrika 56, 75-80). An example is given to illustrate that 'no preferences' may provide relevant information.
7 citations
TL;DR: Using an additional saturating beam, taken from a second laser at fixed frequency, a modification of saturation spectroscopy allows to eliminate or strongly suppress crossover signals as discussed by the authors, which has been applied to the sodium D 1 line.
6 citations
15 Oct 1981
TL;DR: In this article, an optimal control model for predicting operator's dynamic responses and errors in target tracking ability is presented, which predicts asymmetry in tracking data, is dependent on target maneuvers and trajectories and provides estimates for means, standard deviations, and variances for variables investigated and for operator estimates of future target positions and velocities.
Abstract: An optimal control model for predicting operator's dynamic responses and errors in target tracking ability is summarized. The model, which predicts asymmetry in the tracking data, is dependent on target maneuvers and trajectories. Gunners perception, decision making, control, and estimate of target positions and velocity related to crossover intervals are discussed. The model provides estimates for means, standard deviations, and variances for variables investigated and for operator estimates of future target positions and velocities.
TL;DR: In this paper, the part played by topological excitations in the crossover from weak to strong coupling behavior in two-dimensional lattice spin systems with O(N) symmetries is studied.
TL;DR: The reaction time crossover (redundancy associated deficity) scores of 28 process schizophrenics, selected for the presence of crossover, were correlated with the crossover scores of 53 of their first-degree relatives, lending support to the notion of a familial factor in response time crossover.
Abstract: The reaction time crossover (redundancy associated deficity) scores of 28 process schizophrenics, selected for the presence of crossover, were correlated with the crossover scores of 53 of their first-degree relatives (one to five relatives for each patient.). The resulting product-moment correlation coefficient was .27 (p < .05), thus lending support to the notion of a familial factor in reaction time crossover.
Patent•
21 Nov 1981
TL;DR: In this paper, the interpole 6a, 7a are made crossover means directly crossing over is a shape in which a coiled bottom turn of the conventional interpole crossover track is integrated included, at the starting (finishing) end 6 of the N-pole coil and the finishing (starting) end 7 of the S-pole coils.
Abstract: PURPOSE:To contrive the simplification of a structure, the reduction of numbers of parts and saving-energy in soldering work, and the improvement of a product in reliability by a method wherein the interpole crossover track is used as a part of a starting end and finishing end of a coil to eliminate a soldered structure. CONSTITUTION:The interpole 6a, 7a are made crossover means directly crossing over is a shape in which a coiled bottom turn of the conventional interpole crossover track is integrated included, at the starting (finishing) end 6 of the N-pole coil and the finishing (starting) end 7 of the S-pole coil. The crossover means 6a, 7a are put on the top of each other without being soldered on the S-pole coil finishing (starting) end 7 and the N-pole coil starting (finishing) end 6 and form a circuit of the interpole crossover track. Thereby the structure is simplified, the numbers of the parts are decreased, the soldering energy is saved, a fatigue strength of the crossover track is increased and the reliability of the product is improved.
Journal Article•
TL;DR: The stability of Z(N) systems against domain formation in a random field is studied in the limit of small 1/N and a calculation of the crossover from Ising-like to XY-like behavior of the domain wall energy as function of thedomain's linear size is presented.
TL;DR: The author attempts to settle the issue by deriving analytically the optimal solution for a random usage environment by derived the optimal number of calls and then apllied the static-traffic crossover points.
TL;DR: In this article, the crossover behavior of anisotropic cubic N-component spin system with ionic anisotropies of different magnitude is studied in terms of the renormalization-group (RG) approach in momentum space.
Abstract: Crossover behavior of anisotropic cubic N-component spin system with ionic anisotropies of different magnitude is studied in terms of the renormalization-group (RG) approach in momentum space. As a fundamental case, we choose a system with two kinds of strength of ionic anisotropies (i.e. m21 for the M-component spin and m22 for the other (N–M)-one), which has a bicritical point. We discuss the critical behavior and crossover behavior between the M- component system and the N-component system on the critical exponents [i.e., coefficient functions appearing in the RG equation of γS for the spin field S, γS2 for the S2-field and γδS2 for the δS2 (≡[(N-M)S22-MS22]/N)-field] and on the temperature-dependent crossover exponent γeff.