Notes, abstracts, papers, exams and problems of University

School Break Time Memories

During school breaks, my friends and I used to play basketball. We formed teams, and the losing team would buy Lay's for the winning team. I used to play basketball, but I stopped when I broke my finger. Afterward, the school bought a thick and long rope, and I started playing jump rope with my friends. We all got together, and one by one, we started jumping. It was a lot of fun, but actually, I think I'm afraid of it now. I also used to play hide-and-seek with my friends, but I didn't like it much because I felt like time was passing, and the break was ending very quickly. When I entered high school, I stopped playing during breaks and only ate breakfast with my friends. We would sit on a bench and just talk.

A Lost

Lecture 2: Dynamic Dispatch and Interfaces

• Dynamic Dispatch: The process of selecting which implementation of a polymorphic operation to call at runtime.
• Interface: Calling a method that is not in the interface will cause a compilation error.

Lecture 3: N/A

Lecture 4: Method Contracts, Exceptions, and Unit Testing

• Method Contract: Should define pre/post conditions and exceptional behavior. The client is to blame if the precondition is not met, and the service is to blame if the postcondition is not met. Exceptional behavior specifies what the code will do if a precondition is violated.
• Exception: Runtime exception (unchecked) and IO exception (checked). The IO exception must be caught; otherwise, the code won't compile.
• Unit Test: Test boundary

Regarding the difference between a language and a dialect can be confusing. A language is a mental phenomenon, the language lives in the mind because it is a cognitive ability. However, a dialect is a certain type of linguistic variety. It is the way of speaking of a community which is a bit different from the standard one. One problem is dialectal continuum:

The distinction is very broad. If we ask how many languages there are, we will not have an exact answer because there are over 4000 and 6000 languages. It is difficult to say which is a language or which is not. The word 'language' is a concept more political than scientific, the decision in the end is political. For example, the Swedes, Danish, and Norwegians speak highly similar linguistic... Continue reading "Language vs Dialect: Power Dynamics and Societal Influence" »

The Rise of Mesopotamian Civilization

On the banks of the Tigris and Euphrates rivers, the main urban settlements that were to play a leading role in the three millennia of Mesopotamian history emerged. The periodic overflowing of their banks irrigated and enriched the surrounding land, allowing intensive agricultural exploitation. This favored the appearance of stable settlements and their development. Cities such as Uruk, Ur, Lagash, Assur, Mari, and Babylon, among many others, arose, governed independently from a temple-palace.

Mesopotamian Society and Governance

The temple-palace organized the economy and held the political and military monopoly, as it was where the production and surplus from their economic activities were stored. Society... Continue reading "Mesopotamian Civilization: Society, Economy, Religion" »

C Programming Examples

Here are several C programming examples:

Vector Operations

#include <stdio.h>

void leVetor (int v [] , int tam );
int prodEscalar (int v1 [] , int v2 [] , int tam );

int main (void) {
    int v1 [ DIM ], int v2 [ DIM ];
    int i;
    int prod ;

    leVetor (v1 , DIM );
    leVetor (v2 , DIM );
    prod = prodEscalar (v1 , v2 , DIM );
    printf ("%d\n", prod );
    return 0;
}

void leVetor (int v [] , int tam ) {
    /* Completar */
}

int prodEscalar (int v1 [] , int v2 [] , int tam ) {
    /* Completar */
}

Random Number Generation

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

#define VEZES 10

int main (void) {
    int i , j , k;
    double r;

    srand ( time ( NULL )); /* inicializa

Theory of Indifference Curves

Developed by Prof. Thomas S. Alvarez

ECONOMICS AND INDUSTRIAL ORGANIZATION I

Indifference Curves

The table below shows points in four different indifference curves for a consumer.
(a) Draw the indifference curves I, II, III, and IV on the same set of axes.
(b) What are indifference curves?

I II III IV
Qx Qy Qx Qy Qx Qy Qx Qy
2 13 3 12 5 12 7 12
3 6 4 8 5.5 9 8 9
4 4.5 5 6.3 6.3 8.3 9 7
5 3.5 6 5 7 7 10 6.3
6 3 7 4.4 8 6 11 5.7
7 2.7 8 4 9 5.4 12 5.3

(a)

(b) Indifference curves graphically display the tastes and preferences of consumers (in the analysis of utility, the total utility curve introduced consumer tastes). The consumer is indifferent to all the various combinations of X and Y on the same indifference curve... Continue reading "Indifference Curves, Budget Lines, and Consumer Equilibrium" »

Legal Comparisons

Negligence vs. Intentional Tort

Negligence and intentional torts differ primarily in the mindset of the individual causing harm. Negligence occurs when someone fails to exercise reasonable care, often resulting in unintentional harm. In contrast, intentional torts, like assault or battery, involve deliberate actions intended to harm another person.

Strict Liability vs. Negligence

Strict liability and negligence share the goal of holding individuals accountable for harm caused, but their requirements for proving fault differ. Negligence requires proving that the defendant failed to exercise reasonable care, while strict liability does not require any proof of fault.

Defamation vs. Nuisance

Defamation and nuisance are distinct torts... Continue reading "Key Legal Concepts: Torts, Dismissal & Offenses" »

Disentailment (First Half 19th Century)

Historical Context

Beginning in 1836, the disentailment was driven by Juan Álvarez Mendizábal, Minister of Finance in the liberal government. This reform aimed to modernize the Spanish economy and reduce the power of the Church.

Objectives

• Debt Reduction: Obtain revenue to reduce the massive public debt.
• Agrarian Modernization: Modernize agriculture by transferring lands from dead hands to private owners for exploitation.
• Weakening Church Power: Reduce the economic and social power of the Catholic Church, which owned vast tracts of land.

Consequences

• Economic: Public debt was reduced and state resources increased, but land distribution favored the wealthy, worsening inequalities.
• Social: Many peasants and small

Linux File System Structure: An archive of Linux is associated with 3 parts: superblock, inode table, and data blocks.

Network Ports: To see the ports assigned to services.

Display Active TCP/IP Connections: netstat -a

User Management:

• Create password: passwd (user)
• Add user to group: usermod -g group_name
• Disable: 60001
• Enable: 60002

Practical Commands:

Add User: adduser

1. Change folder privileges: chmod
2. Check privileges: ls -de (see if you changed privileges)

1. Create a user: useradd newuser
passwd newuser
2. Create a directory: The command mkdir is used to create directories:
   mkdir mydirectory
3. Create a report: ps -aux >> reporte.txt
4. Directories associated with the user: -d dirname
5. Changing permission: chmod 744 file.txt /file.txt
6. Change owner: chown
   Entering

To control by PWM requires 2 factors:

1-crossing detection signal by 0.

2-? determine the time, every time you walk by 0.

to detect the zero crossing can be performed
through an operational amplifier connected
comparator.

TCA = 785

Pin Symbol Function

1 GND Earth

2 Q2 *Output 2 Inverted

3 Output U QU

4 Q1 * Output 1 Inverted

5 5Synchronizing voltage Vsync (to detect

zero crossing)

6 Inhibitor

7 QZ Z Output

8 8 Vref voltage stabilized (continuous signal for the

integrator)

9 9 ramp resistor R9 (for the integrator)

10 C10 ramp Capacitance (for the integrator)

11 11 V11 Control Voltage (for comparator)

12 12 C12 pulse Extension

13 LLong pulse

14 Q1 Output 1

15 Q2 Output 2

16 l sSupply voltage.