Predictive-reactive Strategy for Flowshop Rescheduling Problem: Minimizing the Total Weighted Waiting Times and Instability

2021 ◽  
Author(s):  
Ayoub Tighazoui ◽  
Christophe Sauvey ◽  
Nathalie Sauer
Keyword(s):  
Waiting Times ◽  
Reactive Strategy

scholarly journals Minimizing the Total Weighted Waiting Times and Instability in a Rescheduling Problem with Dynamic Jobs Weight

2021 ◽  
Vol 11 (15) ◽  
pp. 7040
Author(s):  
Ayoub Tighazoui ◽  
Christophe Sauvey ◽  
Nathalie Sauer
Keyword(s):  
Waiting Times ◽  
Computing Time ◽  
Mixed Integer ◽  
Total Weighted Completion Time ◽  
New Approach ◽  
Hospital Environments ◽  
Efficiency Measures ◽  
Low Weight ◽  
Reactive Strategy ◽  
Weighted Completion Time

Thanks to smart technological tools, customers can at any moment create or modify their commands. This reality forced many production firms to become sensitive in rescheduling processes. In the literature, most of rescheduling problems consider classical efficiency measures. However, some existing works also consider stability as a measure for limiting the deviation from initial schedule. In this work, we aim to bridge the gap in existing works on rescheduling by investigating a new approach to measure simultaneously efficiency by the total weighted waiting times and stability by the total weighted completion time deviation. This combination of criteria is very significant in industrial and hospital environments. In this paper, a single machine rescheduling problem with jobs arriving over time is considered. A mixed integer linear programming (MILP) model is designed for this problem and an iterative predictive-reactive strategy for dealing with the online part. Numerical results show that, at each time the jobs are rescheduled, the low weight ones move forward. Consequently, a new concept consisting in increasing the jobs weight as function of time is established. The effect of this new conception is evaluated by the evolution of the maximum flowtime. Eventually, the computing time of the MILP resolution is studied to explore its limitations.

Improving Access to Oral Surgery Services in Primary Care

2009 ◽  
Vol os16 (4) ◽  
pp. 137-142 ◽  
Author(s):  
Nick Kendall
Keyword(s):  
Primary Care ◽  
Oral Surgery ◽  
Waiting Times ◽  
Primary Care Trust ◽  
Hospital Setting ◽  
Substantial Improvement ◽  
Dental Services ◽  
Collaborative Working ◽  
World Class ◽  
Further Development

This paper describes the innovative use of National Health Service (NHS) dental commissioning powers to develop specialist primary care based oral surgery services. The outcomes, after one full year of the scheme, have been substantial improvement in access and reduced waiting times for patients, further development of NHS primary care dental services through commissioning processes, increased use and engagement of oral surgery specialists outside of a hospital setting, and considerable ongoing savings to the NHS. Collaborative working between hospital consultants and managers, Primary Care Trust dental commissioners, general dental practice providers, specialist oral surgeons and a dental public health consultant has resulted in sustainable benefits to patients and the NHS within the World Class Commissioning framework.

Cotton farmers' adaptation to arid climates: Waiting times to adopt water-saving technology

2021 ◽  
Vol 244 ◽  
pp. 106596
Author(s):  
Qiao Mi ◽  
Xiandong Li ◽  
Xianmei Li ◽  
Guoxin Yu ◽  
Jianzhong Gao
Keyword(s):  
Waiting Times ◽  
Water Saving ◽  
Cotton Farmers

scholarly journals Evaluation of Emergency Health-Care Initiatives to Reduce Overcrowding in a Referral Medical Complex, Jeddah, Saudi Arabia

2021 ◽  
pp. 1-6
Author(s):  
Khalid Alabbasi ◽  
Estie Kruger ◽  
Marc Tennant
Keyword(s):  
Health Care ◽  
Primary Health Care ◽  
Public Hospital ◽  
Waiting Times ◽  
Care Centre ◽  
Health Care Centre ◽  
Transfer Policy ◽  
Primary Health ◽  
Before And After ◽  
Ed Visits

<b><i>Purpose:</i></b> Excessive delays and emergency department (ED) overcrowding have become an increasingly major problem for public health worldwide. This study was to assess the key strategies adopted by an ED, at a public hospital in Jeddah, to reduce delays and streamline patient flow. <b><i>Materials and Methods:</i></b> This study was a service evaluation for a Saudi patient population of all age-groups who attended the ED of a public hospital for the period between June 2016 and July 2019. The Saudi initiative to reduce the ED visits at the King Abdullah Medical Complex hospital has started on August 7, 2018. The initiative was to apply an urgency transfer policy which outlines the procedures to follow when patients arrive to the ED where they are reviewed based on the Canadian Triage and Acuity Scale (CTAS). Patients with less-urgent conditions (category 4 and 5) are referred to a primary health-care practice (where a family medicine consultant is available). Patients with urgent conditions (category 1–3) are referred to a specialized health-care centre if the service is not currently provided. To test the effectiveness of ED initiative on reducing the overcrowd, data were categorized into before and after the initiative. The bivariate analysis χ<sup>2</sup> tests and 2 sample <i>t</i>-tests were run to explore the relationship of gender and age with dependent variable emergency. <b><i>Results:</i></b> A total of 233,998 patients were included in this study, 61.8% of them were males and the average age of ED patients were 35.5 ± 18.6 years. The majority of cases were those classified as “less urgent” (CTAS 4), which accounted for 65.4%. Number of ED visits before and after the initiative was 67 and 33%, respectively. ED waiting times after the initiative have statistically significantly decreased across all acuity levels compared to ED waiting times before the initiative. <b><i>Conclusion and Implication:</i></b> The findings suggest that the majority of patients arrive to the ED with less-urgent conditions and arrived by walking-in. The number of cases attending the ED significantly decreased following the introduction of the urgency transfer policy. Referral for less-urgent patients to primary health-care centre may be an important front-end operational strategy to relieve congestion.

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