Turning a Small Problem into Catastrophe

Author(s):  
Kunibert Raffer
Keyword(s):  
2009 ◽  
Vol &NA; (1273) ◽  
pp. 3
Author(s):  
&NA;
Keyword(s):  

Author(s):  
Suresh S Pitty ◽  
Iftekhar A Karimi

Flowshop scheduling via mixed integer linear programming (MILP) has received considerable attention in the past four decades. However, alternate models are limited; most numerical studies have used small problem sizes. A need for good model evaluation methodology exists; and limited work exists on flowshops with no intermediate storage. This paper presents a classification of flowshops and MILP scheduling models, and addresses some of these issues. It develops a host of new MILP formulations for minimizing makespan in a permutation flowshop with no storage and with or without unit setups. It presents some useful insights into model building by employing a variety of new and old binary variables and coupling them creatively. In contrast to previous work, it evaluates a range of new and existing MILP models using many larger test problems with no or unlimited intermediate storage, and presents a reliable procedure to rank various models based on problems with varying data and sizes. It shows that the top models for the two flowshops indeed show slightly different computational performance.


1993 ◽  
Vol 56 (3) ◽  
pp. 582-586 ◽  
Author(s):  
John Makeham

In this note I shall re-present an old solution to a small problem that was noted by Arthur Waley a little over fifty years ago.2 In the course of doing so, I shall also challenge the view that the Analects does lend support to the view that Confucius maintained that it was important for the gentleman (jun zi) to secure a reputation. Finally, I shall comment briefly on the significance that my overall analysis has for the view that the Analects, despite its composite nature,3 can nevertheless be read as a text which has been consciously edited such that it presents internally consistent themes.


2013 ◽  
Vol 7 (3-4) ◽  
pp. e183-9 ◽  
Author(s):  
Lisa G. Smyth ◽  
Ivor M. Cullen ◽  
David M. Quinlan

Introduction: In the event of the implementation of prostate cancer screening, younger men will be diagnosed more frequently. Erectile dysfunction (ED) is a frequent long-term complication in men post-radical prostatectomy (RP). Since the introduction of RP, urologists have strived to improve postoperative sexual function. There is little literature, however, in the area of ED prescribing and sexual pursuit in men post-RP. We assessed the pursuit of sexual function in this group of patients.Methods: The study involved a detailed questionnaire sent to patients who have undergone radical retropublic prostatectomy (RRP) by one surgeon in one institution to ascertain the impact of ED on lifestyle and ED therapy prescription use.Results: There was a response rate of 59%; most patients who responded were in the 61 to 70 year age group at the time of the survey. About 25% of patients had intercourse more than once in the 4 weeks prior to the survey. A total 50% of patients had no problem or a very small problem with their sexual function. Overall 80% of patients were prescribed ED therapy, but less than 35% of them used it.Conclusion: Sexual frequency peaked in younger patients who were 3 years or more from surgery. Of note, 46% of men either declined the offer of ED therapy or got the prescription and never used it. Only 34% of men had used their ED prescription in the last 4 weeks. Urologists frequently find that patients behave differently postoperatively, with less interest in sexual activity. Interestingly, we found that 50% of our patients classified their sexual function, as at most a small problem.


Nano Today ◽  
2019 ◽  
Vol 26 ◽  
pp. 8-12 ◽  
Author(s):  
Jennifer B. Raftis ◽  
Mark R. Miller
Keyword(s):  

2011 ◽  
Vol 02 (03) ◽  
pp. 355-364 ◽  
Author(s):  
A. Grimsmo ◽  
A. Faxvaag ◽  
V. Heimly

SummaryObjective: To assess the diffusion of Electronic Health Record (EHR) systems over time in Norwegian health care.Methods: This study was based on a retrospective cross-sectional questionnaire survey. Questionnaires for three groups of responders were based on two validated questionnaires from prior studies, which were further customized through workshops. The questionnaires were sent to a random sample of 180 municipalities and 150 general practices in all 26 hospitals in Norway.Results: The diffusion curves for EHR systems from 1980 to 2008 were established and analyzed. The most striking finding was the length of time from the availability of the first adequate EHR systems until full coverage was achieved in general practice and in hospitals. Diffusion of EHRs into nursing homes and maternal and child health centers started ten years later, and the diffusion for these centers has also been slow. In general practice the diffusion seems to follow the classical s-curve of diffusion. Costs and the increasing complexity of EHR systems were regarded by respondents as the most important challenges and concerns for the future. Resistance among health personnel was seen only as a small problem.Conclusion: National strategic processes account for the slow diffusion and complexity of EHR systems in the health sector.


2006 ◽  
Vol 62 (2) ◽  
pp. 23-24
Author(s):  
Jennifer Sass
Keyword(s):  

1991 ◽  
Vol 132 (1779) ◽  
pp. 225
Author(s):  
Leo Black
Keyword(s):  

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