Questions tagged [modelling]

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

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31 views

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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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}\...
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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 ...
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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. ...
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39 views

Modelling belonging of a real variable to an interval by a boolean variable

In the context of a MILP, I have variables $x_{t} \in \mathbb{R}$ which have a lower bound $x^{min}$ and an upper bound $x^{max}$. Let $I_{1} = [x^{min},a_{1}], I_{2} = ]a_{1}, a_{2}], ..., I_{n} = ]...
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63 views

How to mitigate the hierarchical error propagation in tree-structured classification

Suppose we have a multi-class classification problem, where the number of classes $K \geq 3$ We use a tree structure of multiple SVMs to divide and conquer the problem, with one example in the figure ...
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37 views

Middle ground between model-based and model-free approaches

In the context of the reinforcement learning domain, the dichotomy between model-based (learn a model and used it to determine a controller) and model-free (learn a controller without learning a model)...
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183 views

Integer programming for the courier (goods delivery) scheduling problem

Model: Consider an undirected, weighted, complete graph $G = (V, E = V \times V, w: E \to \mathbb{N}^{+}, r: V \to \mathbb{N}^{+}, d: V \to \mathbb{N}^{+})$. $s \in V$ is a source vertex. $G$ ...
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56 views

How to convert a search solution to a path to be tracked?

Let's say I have a space with obstacles and I'm trying to control a robot's movement while avoiding obstacles. I also have a start state and a goal state. I use a search algorithm to find the shortest ...
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42 views

Predict binary occupancy vector from history of vectors

I have a set of binary vectors where each vector represents one day of occupancy in a house and consists of 48 elements (each element for 30 minutes of the day). Each element can be 1 meaning that ...
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2answers
188 views

Modeling tiling problems as SAT problems

I read that tiling problems can be modeled as satisfiability problems (2-SAT?), but the author did not explain how. Is this true? What would be an example? By a "tiling problem" I mean you have a ...
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1answer
442 views

Please explain linear programming as seen for this load balancing problem

I have at hand a linear program related to load balancing. However I have no idea what this is and wikipedia gives me something too simplified/abstract to be useful. I wonder if someone can explain ...
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1answer
26 views

How to evaluate the learned prototypes for multivariate time-series (e.g. motion)?

Consider a method which finds prototypes for multivariate time-series (MTS) data, and is designed to find prototypes for each class of data. For example, the {walking} class consists of some slightly ...
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44 views

How to conceptually represent attributes (characteristics) of an object in logics?

I am reading about/working on the knowledge representation using OpenCog framework http://wiki.opencog.org/w/OpenCog_Framework which essentially is special kind of probabilistic logic (s.c. PLN - ...
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1answer
35 views

How to simulate systems' unavailability?

I am simulating a system where the clients' unavailability is one big issue to the systems behavior. I gathered the real system logs to analyze the unavailability of the clients in the deployment ...
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13 views

Fuzzy graph matching to merge disparate data models

I have 2 disparate data models and I want to identify when they are talking about conceptually similar things. All elements are constructed from the same basis set of 60+ observables. Compound ...
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7 views

What's a difference between Shape-From-Stereo and Shape-From-Motion approaches?

I am reading about different approaches for 3D facial reconstruction and can't get a difference between Shape-From-Stereo (SFS) and Shape-From-Motion (SFM) approaches.The SFS regresses a shape from ...
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27 views

Relational Database to Aggregate Data Model

Can any application currently using a relational database be rewritten to use an Aggregate Data Model, by Focusing on data modelling aspects only (ignoring other features like salability or ...
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13 views

Timed Kripke structures with inequality constraints

I am having problems creating a timed Kripke structure $\mathcal{TK} = \langle S, \mathcal{T}, \rightarrow, L \rangle$ for a system that I have. My system, a timed automaton system (time base $\...
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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 ...
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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{...
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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 ...
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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 ...
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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.