# Questions tagged [modelling]

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

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### What is a logical approach to developing an algorithm which can find the optimal parameters for a function which make it best fit a given data set?

Consider the highlighted columns in the following table: Starting with 100,000 newborns, $l_{x+2}$ denotes the number of individuals in the sample still alive at age $x+2$. If we consider Makeham's ...
1answer
58 views

### How to convert two conflicting objective functions into a single objective function

I have two objective functions say f1 where I have to minimize (X+Y) and another function f2 where I have to maximize (A-B). The two functions are conflicting. I need to convert them into a ...
1answer
177 views

### Set Cover and additional constraints

Consider the following bipartite graph: Each node in red color represents a warehouse $w = \{ 1,2,3\}$. For this example we have three warehouses located at different locations. Each warehouse has a ...
1answer
96 views

### Ambiguity in choosing the best ER model

I am actually little bit confused when I am reading through the text - Database system concepts by Henry F. Korth and others I won't be able to understand one thing, which one of the following models ...
1answer
168 views

### What is the reason of using Gaussian model for Background Modeling?

I am a new learner to Background Subtraction (Background Modeling) and I am reading a few previous works on how it is performed. Starting with Wikipedia (by searching "Background Subtraction"), I ...
1answer
488 views

### Data versioning in a relational database

I've been working on an industrial project where my job was to design a data model in-memory and in a relational database in such a way, that can capture the time-varying nature of the production ...
1answer
73 views

### What is the difference between “information model” and “conceptual model”?

I am trying to figure out the difference between information and conceptual models. For me, both terms seem to mean be the same, but I cannot find a reference where this is established. They are never ...
0answers
540 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: \begin{equation} x= \begin{cases} 0, & \text{if}\...
0answers
38 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 ...
0answers
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. ...
0answers
39 views

1answer
140 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 ...
0answers
62 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{...
0answers
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 ...
0answers
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 ...
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45 views

### choosing right neural network architecture and input features

As a short example suppose we have a kind of pollution sensor and a jet fan in a tunnel. Jet fan turn on/off according to the automatic scenario based on pollution sensor value. Pollution itself ...
1answer
695 views

### Stereotype in UML

What is a Stereotype in Unified modelling language?And What are the primary class stereotypes?.I need clear explanation using diagrams or real world scenario.