Transfer in the A-B prime, A-B Paradigm as a Function of Anticipation-Interval Length

1972 ◽  
Vol 85 (2) ◽  
pp. 217
Author(s):  
Michael Maus
Keyword(s):  
Interval Length ◽  
Anticipation Interval

Performance Approximation for Time-Dependent Queues with Generally Distributed Abandonments

2021 ◽  
Author(s):  
Gregor Selinka ◽  
Raik Stolletz ◽  
Thomas I. Maindl
Keyword(s):  
Performance Measures ◽  
Real World ◽  
Queueing System ◽  
Time Dependent ◽  
Interval Length ◽  
Arrival Process ◽  
Real World Data ◽  
World Data ◽  
Extant Literature ◽  
Approximation Quality

Many stochastic systems face a time-dependent demand. Especially in stochastic service systems, for example, in call centers, customers may leave the queue if their waiting time exceeds their personal patience. As discussed in the extant literature, it can be useful to use general distributions to model such customer patience. This paper analyzes the time-dependent performance of a multiserver queue with a nonhomogeneous Poisson arrival process with a time-dependent arrival rate, exponentially distributed processing times, and generally distributed time to abandon. Fast and accurate performance approximations are essential for decision support in such queueing systems, but the extant literature lacks appropriate methods for the setting we consider. To approximate time-dependent performance measures for small- and medium-sized systems, we develop a new stationary backlog-carryover (SBC) approach that allows for the analysis of underloaded and overloaded systems. Abandonments are considered in two steps of the algorithm: (i) in the approximation of the utilization as a reduced arrival stream and (ii) in the approximation of waiting-based performance measures with a stationary model for general abandonments. To improve the approximation quality, we discuss an adjustment to the interval lengths. We present a limit result that indicates convergence of the method for stationary parameters. The numerical study compares the approximation quality of different adjustments to the interval length. The new SBC approach is effective for instances with small numbers of time-dependent servers and gamma-distributed abandonment times with different coefficients of variation and for an empirical distribution of the abandonment times from real-world data obtained from a call center. A discrete-event simulation benchmark confirms that the SBC algorithm approximates the performance of the queueing system with abandonments very well for different parameter configurations. Summary of Contribution: The paper presents a fast and accurate numerical method to approximate the performance measures of a time‐dependent queueing system with generally distributed abandonments. The presented stationary backlog carryover approach with abandonment combines algorithmic ideas with stationary queueing models for generally distributed abandonment times. The reliability of the method is analyzed for transient systems and numerically studied with real‐world data.

scholarly journals Parameter identification for the linear wave equation with Robin boundary condition

2019 ◽  
Vol 27 (1) ◽  
pp. 25-41
Author(s):  
Valeria Bacchelli ◽  
Dario Pierotti ◽  
Stefano Micheletti ◽  
Simona Perotto
Keyword(s):  
Wave Equation ◽  
Mixed Boundary ◽  
Stability Result ◽  
Interval Length ◽  
Left Endpoint ◽  
Linear Wave ◽  
Reconstruction Procedure ◽  
Element Discretization ◽  
Linear Wave Equation ◽  
Bounded Interval

Abstract We consider an initial-boundary value problem for the classical linear wave equation, where mixed boundary conditions of Dirichlet and Neumann/Robin type are enforced at the endpoints of a bounded interval. First, by a careful application of the method of characteristics, we derive a closed-form representation of the solution for an impulsive Dirichlet data at the left endpoint, and valid for either a Neumann or a Robin data at the right endpoint. Then we devise a reconstruction procedure for identifying both the interval length and the Robin parameter. We provide a corresponding stability result and verify numerically its performance moving from a finite element discretization.

scholarly journals Podolian cattle: reproductive activity, milk and future prospects

2018 ◽  
pp. 200-207 ◽  
Author(s):  
Carlo Cosentino ◽  
Carmine D'Adamo ◽  
Salvatore Naturali ◽  
Giovanni Pecora ◽  
Rosanna Paolino ◽  
...  
Keyword(s):  
Reproductive Activity ◽  
Interval Length ◽  
Calving Interval ◽  
Future Prospects ◽  
Fire Propagation ◽  
Efficient Management ◽  
High Antioxidant Activity ◽  
Consumer Test ◽  
Reproductive Career

In the present study, an original article about Podolian cattle and its milk was performed. In detail, the following factors on reproductive career of Podolian cattle in semi-extensive and extensive rearing were analysed: age of calving, gestation lenght, calving interval length, abortions percentage, conception and calving period. Chemical and phisycal parameters (protein, fat and lactose), somatic cell count, lisozyme content and antiradical activity, with ABTS and DPPH assays, of Podolian milk in semiextensive and extensive rearing were evaluated. Finally, suggestions on future prospects of Podolian milk use were proposed: the preparation of hand soap with 5 percentage of podolian milk and the potential role of this breed for prevention and propagation of fire. The data concerning the reproductive career, milk and envinromental role of 677 cows registered in the Herdbook were analysed. The results showed that the 58.56% of the cows manifested a calving interval of 11-14 months. The reproductive activity occurred in spring; over 70% of the cows calved in the period February-April. The chemical-physical aspects of milk are in agreement with literature. It presents an high antioxidant activity values for each group (97.03% and 97.50% for ABTS and 52.09% and 52.60% for DPPH, semiextensive and extensive system respectively). The consumer test shows that the subjects appreciated the soap containing 5% of Podolian milk for different aspect. The data about environmental role were obtained from Podolian cows reared in fifteen grazing areas were monitored for five years during the summer pasture, when the Podolian cattle graze on green grazing areas located in Basilicata region (South of Italy). Therefore, an efficient management of grazing by Podolian cattle could be an important tool to prevent the fire propagation.

scholarly journals Association of functional genetic variants of A-kinase anchoring protein 10 with QT interval length in full-term Polish newborns

2015 ◽  
Vol 1 ◽  
pp. 149-154 ◽  
Author(s):  
Beata Łoniewska ◽  
Mariusz Kaczmarczyk ◽  
Jeremy Simon Clark ◽  
Iwona Gorący ◽  
Anita Horodnicka-Józwa ◽  
...  
Keyword(s):  
Genetic Variants ◽  
Qt Interval ◽  
Full Term ◽  
Interval Length ◽  
Anchoring Protein

Interval length imbedding for nonlinear two-point boundary-value problems

1974 ◽  
Vol 13 (2) ◽  
pp. 159-163 ◽  
Author(s):  
J. Casti ◽  
R. Kalaba ◽  
G. Meier ◽  
E. Zagustin
Keyword(s):  
Boundary Value Problems ◽  
Boundary Value ◽  
Interval Length ◽  
Point Boundary

Effect of First Birth Interval Length on Preterm of Singleton Birth in Korea; 2010-2013

Perinatology ◽  
2016 ◽  
Vol 27 (4) ◽  
pp. 222
Author(s):  
Sang Hwa Park ◽  
Sung Woo Kim ◽  
Hoon Kim ◽  
Dar Oh Lim
Keyword(s):  
Birth Interval ◽  
Interval Length ◽  
First Birth ◽  
Singleton Birth

scholarly journals Genetic dissection of an allotetraploid interspecific CSSLs guides interspecific genetics and breeding in cotton

2020 ◽  
Author(s):  
De Zhu ◽  
Ximei Li ◽  
Zhiwei Wang ◽  
Chunyuan You ◽  
Xinhui Nie ◽  
...  
Keyword(s):  
Upland Cotton ◽  
Genetic Improvement ◽  
Agronomic Traits ◽  
Physical Map ◽  
Leaf Shape ◽  
Interval Length ◽  
Phenotypic Variance ◽  
Nucleotide Polymorphisms ◽  
Substitution Lines ◽  
Multiple Alleles

Abstract Background: The low genetic diversity of Upland cotton limits the potential for genetic improvement. Making full use of the genetic resources of Sea-island cotton will facilitate genetic improvement of widely cultivated Upland cotton varieties. The chromosome segments substitution lines (CSSLs) provide an ideal strategy for mapping quantitative trait loci (QTL) in interspecific hybridization.Results: In this study, a CSSL population was developed by PCR-based markers assisted selection (MAS), derived from the crossing and backcrossing of Gossypium hirsutum (Gh) and G. barbadense (Gb), firstly. Then, by whole genome re-sequencing, 11,653,661 high-quality single nucleotide polymorphisms (SNPs) were identified which ultimately constructed 1,211 recombination chromosome introgression segments from Gb. The sequencing-based physical map provided more accurate introgressions than the PCR-based markers. By exploiting CSSLs with mutant morphological traits, the genes responding for leaf shape and fuzz-less mutation in the Gb were identified. Based on a high-resolution recombination bin map to uncover genetic loci determining the phenotypic variance between Gh and Gb, 64 QTLs were identified for 14 agronomic traits with an interval length of 158 kb to 27 Mb. Surprisingly, multiple alleles of Gb showed extremely high value in enhancing cottonseed oil content (SOC). Conclusions: This study provides guidance for studying interspecific inheritance, especially breeding researchers, for future studies using the traditional PCR-based molecular markers and high-throughput re-sequencing technology in the study of CSSLs. Available resources include candidate position for controlling cotton quality and quantitative traits, and excellent breeding materials. Collectively, our results provide insights into the genetic effects of Gb alleles on the Gh, and provide guidance for the utilization of Gb alleles in interspecific breeding.

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