# Questions tagged [modelling]

Questions on how to represent real-world or non computer science problems with computer science tools.

26 questions with no upvoted or accepted answers
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### Solving an Interlacing Cords puzzle inside a Truncated Octahedron

My friend got me this really interesting puzzle Each node can be slided or docked around the Truncated Octahedron, creating knots and tangles in the middle of the puzzle. The idea is to move the ...
221 views

### Context-free grammar for DAGs?

I'm looking for a "safe" representation of DAGs. With "safe" representation I mean that it can be described by a context-free grammar. Ideally, this grammar would be suitable for a simple LR parser. ...
267 views

### The meaning of ontology in computer science

I am reading a paper and ran into this word Ontology-based, What does it really mean? I did searching about it but still ambiguous to me, can someone elaborate this ...
55 views

### An alternative to the object paradigm

I've been playing around with an alternative to the standard object-oriented paradigm for modeling data, and I would like to know if there is any research or already existing systems along the same ...
24 views

### A* orientation discretization

I have a space with obstacles I wish to find a path through. What I can do is discretize the space into a grid and use A* (or D* or whatever) to find a path through it. I wish to now add orientation ...
188 views

### How to select a good window size in the Running Gaussian Average method for Selective Background Updating?

I have been studying the Selective Background Updating in Running Gaussian Average Method, as discussed in the Wikipedia (the Variant method). The details of the algorithm, as I understand, is as ...
43 views

### Calibrating a Markov Chain with little data

I am trying to calibrate a Markov Chain. Usually you would have the amount that "moves" from one state to the other and then the resulting value, with data at any given time with the following ...
569 views

### Restriction for greater than constraint in linear programming

I have a model that considers real values and that uses a binary variable $x$. In this model, the following conditions should apply: x= \begin{cases} 0, & \text{if}\...
40 views

### DAGs and Equivalence Class of DAGs

I am learning DAGs and Equivalence Class of DAGs, I am reading the material by Prof. Campos Ibáñez here: https://www.cs.cmu.edu/afs/cs/project/jair/pub/volume18/acid03a-html/node2.html However, I ...
10 views

### B2B integration modelling tools and standard suggestions

This question might be too broad, but I really need help with this. I am required to choose a standard or notation to model an integration between two business processes, one of which is external. ...
39 views

160 views

### How to write an if then logical constraint given part of the input related to a decision variable?

I am trying to solve an assignment problem-like from a bi-objective persepctive where I have a marketplace of vendors proposing different machines with different types and specs. The goal is to select ...
63 views

### How to model an ''affinity constraint'' in assignment problem

Working on an optimization problem formulated using the well known assignment problem. My decision variable is defined as follows : \alpha _{x}^{r,u} = 1\begin{cases} & \text{ 1 if } \mathbf{...
28 views

### How to define a generic evaluation metric

Given a system (S) that accepts a tuple of parameters ($\alpha, \beta, \gamma \dots$ etc). These parameters affect the performance of S in a different way. For instance, decreasing $\alpha$ would ...
69 views

### Applying Ford-Fulkerson to settle a business lunch

I want to organize a business lunch with two societies $E_1$ (mine) and $E_2$. Each society is made of four people from the Executive management and 6 of the Financial Management. I want to organize ...