Availability Confidence Limits for Passenger Aircraft with Exponential Operation Time and Repair Time

2014 ◽  
Author(s):  
Sun Yongquan ◽  
Ren He ◽  
Yuan Huijuan ◽  
Su Zimei ◽  
Hu Dandan
Keyword(s):  
Operation Time ◽  
Repair Time ◽  
Confidence Limits ◽  
Passenger Aircraft

Pylorus-Preserving Pancreaticoduodenectomy: Evaluation of 50 Cases

2017 ◽  
Vol 13 (1) ◽  
pp. 42-45
Author(s):  
SM Shakhwat Hossain ◽  
Ferdous Rahman
Keyword(s):  
Gastric Emptying ◽  
Mortality Rate ◽  
Wound Infection ◽  
Postoperative Mortality ◽  
Operation Time ◽  
Armed Forces ◽  
Military Hospital ◽  
Morbidity Rate ◽  
Proper Patient Selection ◽  
Periampullary Neoplasms

Introduction: Pancreaticoduodenectomy is the procedure of choice for periampullary neoplasms. It is considered as a major surgical procedure. It is associated with relatively higher postoperative mortality and morbidity rate, however, with development of technology, proper patient selection, meticulous operative technique, appropriate postoperative care, morbidity and mortality rate has decreased subsequently. Up to the 1970s, the operative mortality rate after pancreaticoduodenectomy approached 20% but it has been reduced to less than 5% in recent reports. This study is designed to evaluate the postoperative outcomes of pylorus-preserving pancreaticoduodenectomy procedure in our set up. Objective: To evaluate the outcome of the pylorus-preserving pancreaticoduodenectomy procedure with the intention to measure operation time and per-operative bleeding, observing postoperative anastomotic leakage and gastric emptying time. To find out postoperative wound infection and complications to detect the dumping syndrome. Materials and Methods: A prospective observational study was carried out in the Department of Hepatobiliary Surgery, Combined Military Hospital, Dhaka from July 2013 to January 2017. Fifty patients who underwent pylorus-preserving pancreaticodudenectomy procedure were included in this study. Results: Out of 50 postoperative patients, 12(24%) patients developed complications. Of these patients, 3(6%) developed wound infection, 2(4%) developed bile leakage and 2(4%) developed postoperative haemorrhage. Pancreatic fistula, vomiting, delayed gastric emptying and abdominal collection all were 1(2%) each. Postoperative mortality was 3(6%). Conclusion: The present study demonstrated the development of postoperative complications after pylorus-preserving pancreaticoduodenectomy is as similar as published in different studies. Better outcome can be achieved with meticulous pre-operative evaluation of risk factors and per-operative skill maneuvering. Journal of Armed Forces Medical College Bangladesh Vol.13(1) 2017: 42-45

Determination of Optimal Reserve between Two Machines in Series with the Repair Time has Change of Distribution after the Truncation Point

GIS Business ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 577-585
Author(s):  
T. Vivekanandan ◽  
S. Sachithanantham
Keyword(s):  
Real Life ◽  
Random Variable ◽  
Repair Time ◽  
Inventory Level ◽  
Optimal Size ◽  
Truncation Point ◽  
In Series ◽  
Optimal Reserve ◽  
Optimal Inventory Level ◽  
Two Machines

In inventory control, suitable models for various real life systems are constructed with the objective of determining the optimal inventory level.  A new type of inventory model using the so-called change of distribution property is analyzed in this paper. There are two machines M1 and M2  in series and the output of M1 is the input of M2. Hence a reserve inventory between M1 and M2 is to be maintained. The method of obtaining the optimal size of reserve inventory, assuming cost of excess inventory, cost of shortage and when the rate of consumption of M2  is a constant, has already been attempted.  In this paper, it is assumed that the repair time of M1  is a random variable and the distribution of the same undergoes a change of distribution  after the truncation point X0 , which is taken to be a random variable.  The optimal size of the reserve inventory is obtained under the above said  assumption . Numerical illustrations are also provided.

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