What are the criteria to evaluate the performance of a valid inequality in a bi-objective mathematical model?

More Hossein Karimi's questions See All

Could you please recommend some good journal that accept very long revie papers (approximately 6000+ words) in neurosurgery, cancer biology ?

01 March 2021 8,087 3 View

I need dataset for recommandation system?

Hi every body I need to collect datasets from different source to work on recommendation system algorithms, could you advise me how collect data?

27 February 2021 7,063 7 View

How to model Supercritical water gasification (SCWG) process in Homer software?

Hi everyone How to model Supercritical water gasification (SCWG) process in Homer software?

25 February 2021 4,075 1 View

Errors in DNA sequences?

I am trying to better understand the scope of DNA replication and sequencing errors, e.g. 1. I have seen similar error rates of 10e4 to 10e5 for cell & instrumental DNA replication,...

24 February 2021 4,397 3 View

Does PHA-P stimulate the proliferation of lymphocytes from mice?

Hello, I will start performing MLR using lymphocytes from mice's spleen and I would like to know the better way for the stimulation. If is using PHA-P or CD3/CD28? I would like to know as well if...

23 February 2021 5,476 4 View

Is it possible to define biogas as a fuel in the reformer process(scwg) in Homer software?

Hi every one Is it possible to define biogas as a fuel in the reformer process(scwg) in Homer software? Biogas fuel is not available in the options thanks

23 February 2021 6,518 3 View

Could not amplify CD28 and CD3z ectodomain from cDNA of Jurkat Cells ?

For my experiments, I have to express ectodomains of human CD28 and CD3z. As a source, I extracted RNA from Jurkat cells and verified the quality of RNA on the gel. I, then, prepared cDNA using...

23 February 2021 7,051 4 View

Best FE Program for Concrete Strengthened with FRP Sheets?

Colleagues, I have been using ANSYS to model concrete strengthened FRP sheets, but less than happy with it. Any has recommendation for efficient, easy to use FE program for modelling concrete...

22 February 2021 7,528 3 View

How can I find the thermophysical properties of high temperature microencapsulated phase change materials (MPCM)?

Hi everyone. I am looking for a high temperature MPCM. More specifically, I need the thermo physical properties of a microencapsulated phase change material with the melting temperature between...

14 February 2021 3,606 2 View

Can explain this diagram to me, is this the average consumption curve for one day or the total consumption of days in a month summed up in specific?

The hourly load curves of the selected household in each season are shown in Fig. 28. Figure 28 shows the demand for electricity in four months on an hourly basis. Can you explain this diagram to...

08 February 2021 657 16 View

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

Which is suitable for use with Python? MySQL or SQL Server?

Which is suitable for use with Python? MySQL or SQL Server? What is your suggestion?

01 March 2021 3,422 3 View

High aspect ratio hexahedral mesh optimization solver?

I am interested in evaluating mesh optimization solvers that converge to high aspect ratio unstructured hexahedral grids. In other words, I am interested in a solver that optimizes warpage,...

26 February 2021 7,279 2 View

How to plot the probability paper of Gumbel distribution using R programing?

In R-studio, there are many commands of Gumbel package. Arguments are also different. I`m asking about the alpha parameter of the Copula which must be greater than 1. If this is the one used to...

25 February 2021 5,229 3 View

How to interpolate from a time-series database ?

Hi, I am having trouble with a problem, in the field of Optimal Control and the generation of optimal time-series. Let's consider a system, whose dynamics are represented by dx/dt =...

24 February 2021 9,105 2 View

What software programs can directly simulate Additive Manufacturing Directed Energy Deposition (DED)?

I understand there are a lot of software programs that can simulate DED by going through specific modeling, simulation, and commands. For me, that was time consuming and results were not accurate....

24 February 2021 4,428 3 View

I am looking for a simple software program to model 3D chemical bonds. The purpose is to generate high-quality graphical abstracts. Any suggestion?

Hello everyone: I am looking for a simple software program to model chemical bonds. The purpose is to generate a high-quality graphical abstract for a top leading journal in the field of...

23 February 2021 8,012 3 View

How to estimate 2SLS with different instruments for different endogenous variables?

To be specific, I want to conduct an IV regression in stata with the following three equations. EQ1: Y1 ~Y2 Y3 X EQ2: Y2 ~ Z1 EQ3: Y3 ~ Z2 Both Y2 and Y3 are endogenous. However, Z1 and Z2 are...

23 February 2021 6,266 3 View

Are there methods for automatically mapping floodplains, fans and terraces?

I want to map these river geoforms with as little subjectivity as possible. I have a high resolution DEM generated by drone data.

22 February 2021 7,800 3 View

Mohamed-Mourad Lafifi

Dear Hossein,

I suggest for you alinks and attached files in topics.

-Computers & Operations Research | Articles in Press | ScienceDirect ...

www.sciencedirect.com/science/journal/aip/03050548

-Figure 1. Scheme of the single-item lot-sizing problem. - Scientific ...

https://www.researchgate.net/.../283617778_fig1_Figure-1-Schem...

-ICORES 2014 - International Conference on Operations Research and ...

www.icores.org/Abstracts/2014/ICORES_2014_Abstracts.htm

-Deterministic Modeling - Linear Optimization with Applications

home.ubalt.edu/ntsbarsh/opre640a/partviii.htm

-One-hour-ahead wind power forecast using hybrid grey models

www.inderscience.com/info/ingeneral/forthcoming.php?jcode...

best regards

Mir Saman Pishvaee

Note that valid inequality tighten the feasible region of the problem which is formed by the constraints (not by the objective functions). Therefore, there is no obstacle to use the linear relaxation. However, you can also use the computational time as another index to evaluate valid inequalities.

Razi Jabur Al-Azawi

Dear Hossein Karimi

see the following vedio may be help you

https://www.youtube.com/watch?v=y5KUJbT-2-o

Adam N. Letchford

Beautiful question. Perhaps you could plot the approximations to the efficient frontier that you obtain with and without the inequalities, and compare them... maybe in terms of area or of max distance from the true frontier?

Hossein Karimi

Dear Mohamed-Mourad Lafifi,

Thanks, I checked the papers to find an idea. However, I found that the computational time as another useful index.

Dear Mir Saman Pishvaee,

I am so grateful for the comment. As you noted and I know, the solution time, linear relaxation solution, and node used in B&B or B&C are the most employed indices.

Dear Razi Jabur Al-Azawi,

Thank you, In this video, she spoke Spanish. Therefore, I could not understand.

Dear Adam N. Letchford,

Thanks, Good point, I seek an idea the same as you suggested. I think, finding the area is so challenging. What is your idea to use Hausdorff distance between the optimal frontier and the frontier obtained by linear relaxation with and without valid inequalities?

I guess so. You might need first to "normalise" the two objectives somehow, so that a "vertical" distance can be meaningfully compared to a "horizontal" distance.