Notes, summaries, assignments, exams, and problems

Cell Observation Techniques

Aim: Observe Cells and Subcellular Structures

• Add specimen (e.g., onion epidermis) on a slide.
• Stain (e.g., iodine) to highlight structures.
• Lower cover slip at an angle to reduce air bubbles.
• Use low → high magnification.
• Focus using coarse → fine adjustment.
• Label parts of the microscope.
• Calculate magnification.
• Measure size using a scale bar.
• Understand differences between plant and animal cells.
• Explain why staining is used (to see organelles like the nucleus).

Investigating Osmosis

Aim: Investigate Osmosis with Potato Cylinders

• Cut identical potato pieces.
• Weigh each piece, then place in sugar solutions of different concentrations.
• Leave for 24 hours, then dry and reweigh.

Experimental Variables:

• Independent Variable (IV)

Software Design Patterns and Architecture (CSC3324)

Defining Software Design Patterns

• A reusable solution to a recurring design problem.

• It reuses abstract knowledge about problems and solutions.

• Independent of specific implementations, it acts as a template.

• It utilizes Object-Oriented Programming (OOP) features such as inheritance and polymorphism.

The Christopher Alexander Definition

“Each pattern describes a problem which occurs over and over again... and then describes the core of the solution... you can use this solution a million times over without doing it the same way twice.”

Architecture vs. Design Patterns

Software Architecture Fundamentals

• Definition (IEEE): The fundamental organization of a software system, including components, their relationships, and design principles.

• Purpose: To ensure reliability, efficiency, security, and maintainability.

Architectural Design Process

• Goal: Design the system’s overall structure and its communication.

• Outputs: An architectural model showing component interaction.

• Key Link: Connects requirements to design.

Software Architecture Documentation

• Includes:

  • Product Overview

  • Static and Dynamic Architectural Models

  • Mapping Between Models

  • Design Rationale

Architectural Abstraction Levels

• In the Small: Structure of a single program.

• In the Large: Structure of enterprise-level systems across networks.

Benefits of Explicit Architecture

• Stakeholder

What is a Profession?

Definitions and Traits

What is the difference between a profession and an ordinary job? Here are some key definitions and traits:

• Dictionary Definition: According to Littrich & Murray, citing the Oxford English Dictionary, a profession is “a vocation or calling, especially one that involves some branch of advanced science or learning.”
• Common Traits (Millerson in Littrich & Murray):
  • Skill based on a body of theoretical knowledge.
  • Provision of training and education.
  • Testing competence prior to entrance.
  • Organisation.
  • A code of ethics.
  • An ethos of altruistic service.
  • Selflessness.
• Dal Pont’s Common Attributes of a Profession:
  • Special skill and learning.
  • Public service.
  • Differentiates from other professions.
  • Self-regulation

1.) What is computational complexity theory, and why is it important? It studies how efficiently problems can be solved using algorithms. 2.) Explain the difference between time complexity and space complexity. Time complexity measures how the runtime of an algorithm grows with input size, while space complexity measures how much memory an algorithm uses as input size grows. 3.) What are P and NP classes in complexity theory? P contains problems that can be solved quickly (in polynomial time), while NP contains problems whose solutions can be verified quickly. 4.) What does it mean when a problem is NP-complete? It means the problem is one of the hardest in NP; solving one NP-complete problem quickly means all NP problems can be solved quickly.... Continue reading "Core Principles of Computation: Complexity, Automata, and Algorithms" »

Causative Verbs in English

Causative verbs are used when one person or thing causes another person or thing to do something, or to have something done to them. Here are the main forms:

Form 1: Subject + Have / Get + Object + Past Participle

• Structure: Subject + have / get + Object + Past Participle
• Example: I got my hair cut last week.

Form 2: Subject + Have + Agent + Base Verb + Object

• Structure: Subject + have + Agent + Base Verb + Object
• Example: Sussane had her brother cut.

Form 3: Subject + Get + Person + To + Base Verb

• Structure: Subject + get + Person + to + Base Verb
• Example: She gets her son to do this.

Understanding the Passive Voice

The passive voice is used when the focus is on the action rather than the doer of the action. It is often used... Continue reading "Mastering English Sentence Structures: Causatives, Passives, Conditionals, Relative Clauses" »

Alternating Current (AC) Generator Fundamentals

Principle of AC Generator Operation

The AC generator works on the principle of electromagnetic induction. According to Faraday’s Law of Electromagnetic Induction, when a conductor rotates in a magnetic field, a changing magnetic flux is linked with the conductor, and an electromotive force (EMF) is induced in it. If the conductor is part of a closed circuit, an electric current flows.

Construction of AC Generator Components

An AC generator mainly consists of the following parts:

• Magnet (Field Magnet): Provides a magnetic field. It can be a permanent magnet or an electromagnet.
• Armature (Coil): A rectangular coil made of copper wire, usually wound on a soft iron core, which rotates between the poles

Linguistics Fundamentals and Language Processing

Differences Between Spoken and Written Language

Spoken language differs from written language primarily because:

• Written language is planned, allowing the writer time to think.
• Spoken language requires an immediate response.
• Written language is permanent.

What is Morphology?

Morphology refers to the study of how words and word parts change to express different meanings.

Systemic Functional Linguistics (SFL)

Systemic Functional Linguistics (also known as Hallidayan Linguistics) was devised by Michael Halliday.

Defining Audiolingualism

Audiolingualism is a method of foreign language instruction focusing on speaking and listening skills.

Psycholinguistics: Language Processing

Psycholinguistics is the study of... Continue reading "Essential Concepts in Linguistics and Academic Writing" »

Opinion Essay: Homework's Impact

Introduction

Recently, many people have suggested that homework should be banned or reduced. I strongly believe it is often harmful and should be limited to avoid extra stress for students.

First Paragraph

Firstly, too much homework can make students feel stressed, tired, and even frustrated. Young people need time to relax, play sports, and spend time with family and friends, which is just as important as studying. Studies show that too much homework can even lower school performance and harm mental health.

Second Paragraph

Moreover, an experiment, which took place in Finland 5 years ago, showed that students with less homework were more motivated and did better in school. Indeed, if this study had not happened,... Continue reading "Rethinking Homework: Benefits and Drawbacks for Students" »