Evaluation of Pull Control Strategies and Production Authorisation Card Policies Recovery Period in a Multi-product System

2015 ◽  
pp. 19-28
Author(s):  
Chukwunonyelum Emmanuel Onyeocha ◽  
Joseph Khoury ◽  
John Geraghty
Keyword(s):  
Control Strategies ◽  
Recovery Period ◽  
Product System ◽  
Pull Control

scholarly journals Integrated pest management: the push–pull approach for controlling insect pests and weeds of cereals, and its potential for other agricultural systems including animal husbandry

2007 ◽  
Vol 363 (1491) ◽  
pp. 611-621 ◽  
Author(s):  
Ahmed Hassanali ◽  
Hans Herren ◽  
Zeyaur R Khan ◽  
John A Pickett ◽  
Christine M Woodcock
Keyword(s):  
Insect Pests ◽  
Control Strategies ◽  
Animal Husbandry ◽  
Farm Animals ◽  
Subsistence Farming ◽  
Cereal Crop ◽  
Trap Crops ◽  
Pull System ◽  
Trap Cropping ◽  
Pull Control

This paper describes the ‘push–pull’ or ‘stimulo-deterrent diversionary’ strategy in relation to current and potential examples from our own experiences. The push–pull effect is established by exploiting semiochemicals to repel insect pests from the crop (‘push’) and to attract them into trap crops (‘pull’). The systems exemplified here have been developed for subsistence farming in Africa and delivery of the semiochemicals is entirely by companion cropping, i.e. intercropping for the push and trap cropping for the pull. The main target was a series of lepidopterous pests attacking maize and other cereals. Although the area given to the cereal crop itself is reduced under the push–pull system, higher yields are produced per unit area. An important spin-off from the project is that the companion crops are valuable forage for farm animals. Leguminous intercrops also provide advantages with regard to plant nutrition and some of the trap crops help with water retention and in reducing land erosion. A major benefit is that certain intercrop plants provide dramatic control of the African witchweed (striga). Animal husbandry forms an essential part of intensive subsistence agriculture in Africa and developments using analogous push–pull control strategies for insect pests of cattle are exemplified.

On Designing Robust Kanban Production Control Strategies in Multiproduct Manufacturing Environments

2014 ◽  
pp. 68-88
Author(s):  
Oladipupo Olaitan ◽  
Anna Rotondo ◽  
Paul Young ◽  
John Geraghty
Keyword(s):  
Manufacturing System ◽  
Production Control ◽  
Control Strategies ◽  
Product System ◽  
Service Levels ◽  
Work In Progress ◽  
Demand Variability ◽  
Multiproduct Manufacturing ◽  
Manufacturing Environments ◽  
Different Levels

In this chapter, two Kanban Allocation Policies, Shared (S-KAP) and Dedicated (D-KAP), are analysed to understand how they would perform under different manufacturing scenarios, and the authors identify the merits and demerits of each. To evaluate the performance, a three-stage two product system was simulated under scenarios that provide for different levels of demand variability for each product. When operated under S-KAP, the system contained less Work In Progress (WIP); however, under D-KAP, the system provided more robust service levels as the variability increased. Based on the results from the model, guidelines on how to effectively combine these two policies to achieve the benefits of both in a multiproduct manufacturing system are developed. By partitioning the system at locations that would suit the transformation from one policy to another in a similar fashion to what is obtained in hybrid push-pull strategies, and deploying the policies that match the dominant characteristics at each segment, gives reduced WIP while maintaining service levels.

scholarly journals A comparative study of different pull control strategies in multi-product manufacturing systems using discrete event simulation

2021 ◽  
Vol 16 (4) ◽  
pp. 473-484
Author(s):  
A.S. Xanthopoulos ◽  
D.E. Koulouriotis
Keyword(s):  
Manufacturing Systems ◽  
Manufacturing System ◽  
Production Control ◽  
Control Strategies ◽  
Base Stock ◽  
Single Type ◽  
Hybrid Strategy ◽  
Product Manufacturing ◽  
Pull Control ◽  
Varying Demand

Pull production control strategies coordinate manufacturing operations based on actual demand. Up to now, relevant publications mostly examine manufacturing systems that produce a single type of a product. In this research, we examine the CONWIP, Base Stock, and CONWIP/Kanban Hybrid pull strategies in multi-product manufacturing systems. In a multi-product manufacturing system, several types of products are manufactured by utilizing the same resources. We develop queueing network models of multi-stage, multi-product manufacturing systems operating under the three aforementioned pull control strategies. Simulation models of the alternative production systems are implemented using an open-source software. A comparative evaluation of CONWIP, Base Stock and CONWIP/Kanban Hybrid in multi-product manufacturing is carried out in a series of simulation experiments with varying demand arrival rates, setup times and control parameters. The control strategies are compared based on average wait time of backordered demand, average finished products inventories, and average length of backorders queues. The Base Stock strategy excels when the manufacturing system is subjected to high demand arrival rates. The CONWIP strategy produced consistently the highest level of finished goods inventories. The CONWIP/Kanban Hybrid strategy is significantly affected by the workload that is imposed on the system.

scholarly journals Served Well? A Pilot Field Study on the Effects of Conveying Self-control Strategies on Volleyball Service Performance

2019 ◽  
Vol 9 (9) ◽  
pp. 93 ◽  
Author(s):  
Bieleke ◽  
Kriech ◽  
Wolff
Keyword(s):  
Field Study ◽  
Control Strategies ◽  
Recovery Period ◽  
Adjustment Costs ◽  
Service Performance ◽  
Self Control ◽  
Warm Up ◽  
Goal Condition ◽  
Objective Performance ◽  
Performance Development

Volleyball serves constitute an important example for a self-controlled sequence of actions in sports that is difficult to improve. It is therefore paramount to investigate whether and how conveying self-control strategies to athletes affects their service performance. To address this question, we conducted a pilot field study with sixty-two players from four Swiss volleyball schools. They performed a warm-up and subsequently a first series of 15 serves. Objective service performance was measured in terms of errors, velocity, and precision. Afterwards, players formulated either individual goals (goal condition) or plans (plan condition) based on their coaches' correction instructions. In a second series of 15 serves objective performance was worse in some respects compared to the first series (i.e., more errors in the plan condition, reduced precision in both conditions). Mixed-effects analyses of performance development across conditions in the second series showed initially reduced but steadily recouping precision and velocity, while the number of errors stayed constant. In contrast to the objective performance, coaches evaluated their players' service performance during the second series of serves as substantially better than during the first series. Taken together, the results of this pilot field study suggest that conveying either goals or plans as self-control strategies may involve initial adjustment costs followed by a subsequent recovery period.

The Effect of Exercise and Distraction on Blood Pressure Recovery Following an Anger-Provoking Stressor in Normotensive Young Adults

2015 ◽  
Vol 29 (2) ◽  
pp. 45-54 ◽  
Author(s):  
Faye S. Routledge ◽  
Judith A. McFetridge-Durdle ◽  
Marilyn Macdonald ◽  
Lynn Breau ◽  
Tavis Campbell
Keyword(s):  
Blood Pressure ◽  
Cardiovascular Health ◽  
Exercise Intervention ◽  
Recovery Period ◽  
Intervention Group ◽  
Exercise Group ◽  
State Anger ◽  
Increased Risk ◽  
Anger Reactivity ◽  
Quiet Sitting

Ruminating about a prior anger provoking event is found to elevate blood pressure (BP) and delay BP recovery. Delayed BP recovery may be associated with increased risk of hypertension. Interventions that improve BP recovery may be beneficial for cardiovascular health. The purposes of this study were to evaluate the influence of rumination and anger on BP reactivity and recovery, to compare the effect of an exercise intervention or distraction intervention on BP recovery and to explore if exercise improved BP recovery by distracting participants from stressor-related rumination and anger. Healthy, normotensive participants (n = 79, mean age 22.2 ± 4.0 years) underwent an anger-recall interview stressor task, 3 min of exercise (walking), distraction (reading) or no-intervention (quiet sitting) and a 15 min recovery period. State anger reactivity was associated with Δ diastolic (D) BP reactivity and approached significance with Δ systolic (S) BP reactivity. Trait rumination was associated with greater SBP during recovery. Δ SBP recovery did not differ between the exercise, distraction and no-intervention groups. Although there were no differences in Δ DBP recovery between the exercise and no-intervention groups, distraction improved Δ DBP recovery compared to the exercise intervention but not the no-intervention. The proportion of anger-related thoughts (state rumination) in the exercise group did not differ from the distraction or no-intervention groups. However, a smaller proportion of participants in the distraction intervention reported an anger-related thought during recovery compared to the no-intervention group with 76% of their thoughts relating to the provided distraction. Overall, post-stressor exercise was not found to improve BP recovery while reading was effective at distracting individuals from angry thoughts (state rumination) but had no effect on BP compared to no-intervention.

Sign in / Sign up

Export Citation Format

Share Document