الخطوات الأولى في عملية النمذجـــــة Modeling

Dear brothers and sisters
I have a master in modeling : Modélisation
Or نمدجة
Modeling consists on writing a problem using linear or non- linear equations. In other words, we can formulate any problem using mathematical equations. In my speciality, I have always an objective function to satisfy for exemple minimize the completion time or maximize the profit under a set of constraints that must be satisfied

To solve the models we have many choice
If it is linear and very simple ( The number of variables is small), we can use Excel: Solver or lindo or storm
If the number of variabes is very big (Number of Binary variables +contenuous variables > 100.000), in this case we must use a professional software like Lingo Or CPLEX for the linear models and Lingo for non-linear models

Actually, I'm using CPLEX to solve linear models of shceduling problems
To use this program, you need knowledge in langage C or C++ or Java+ Reading the Help of CPLEX
I hope that I added pertinent informations
If you need more information don't hesitate to contact me

kind regards

 

Baraka ALLAHOU fik 3ala hadha Arrad

You have proposed a good Idea Mr sumerland but the members in this forum as I noticed are not familiar with scheduling problem and operations research. I suppose that Mr Zidan is the only member who has an idea about this field. These problems can be applied in industrial engineering field

Kind regards

 

IBM ILOG Optimization products

Machkour Akhi Saad
Baraka ALLAHOU fik

The software CPLEX which wasn't free before is now free and every researcher that belongs to any university can use the last version of this software for free. Below you find the details

The IBM Academic Initiative is a program for college and university professors. It includes no-charge software and courseware
Link: ​

These softwares are used to solve many problems in combinatorial optimization and
operations research fields​

Example of softwares: IBM ILOG CPLEX, CP, CP Optimizer
CPLEX: can be used to solve big Mixed-integer linear programs

Please find attached a PDF file that contains the steps to be followed in order to download these softwares

You can find the help of CPLEX, CP, CP Optimizer in this website:

Best regards​

 

Dear Sumerlend
My experience is not as improtant as yours. I began my research in 2006

1Using these softwares is not very complicated. You need one day to write your first programm after that you read the help in order to change the parameter and understand the different functions

2I was present at the conference of IBM ILOG in Toulouse (France) and this software is a profetional one and it's not in his developement phase. Among the question at the conference: Is it a short strategy of IBM or not and the answer was no it's a long term strategy. We can renew the licence every year and it's from 12 months to 15 months (The licence is not free for industrials and it costs more than 1600 Euro

3Regarding Excel, we can't use Excel to solve these problems because the numbre of variables is huge. I know the Solver of Excel it's limited to small problems. However, we know all that Excel is very good software which can be used to model thousand of problems in all fields

T9abbal minni Fai9a atta9dir wal I7tiram
Baraka Allahou fik

 

بالنسبة للمهتمين بالموضوع
Matlab يتضمن في أخر اصدره 2009a العديد من librarys كانوا من قبل يباعو بصفة فردية
هذا ساعدني كثيراً في نمذجة العديد من systems

 

جزاك الله خير