Notes, summaries, assignments, exams, and problems for Technology

Understanding Computer Abuse

Computer abuse involves improper or illegal actions using computers, demonstrating irresponsibility with technology. There are several common forms of computer abuse:

Spam

Spam is the use of electronic messaging systems to send unsolicited or unwanted messages. While most commonly associated with email, the term applies to any electronically sent message that is not requested.

Cyberbullying

Cyberbullying is the use of electronic communication to bully others. This includes sending, posting, or sharing negative, harmful, false, or mean content about someone.

Computer Sabotage

Computer sabotage is the intentional use of technology to damage computer systems, including both hardware and software.

Viruses

A computer virus is... Continue reading "Understanding and Preventing Computer Abuse and Cybercrime" »

BigQuery for Predictive Modeling & Geospatial Data

• Petabyte-scale data warehousing
• GeoJSON and geospatial processing
• Predictive modeling capabilities

IoT Data Processing with Kafka & Dataflow Alerts

• Kafka I/O as input stream
• Dataflow for stream ingestion and windowed processing
• Alerting if moving average falls below 4,000 messages

Cloud SQL for MySQL: High Availability & Zone Failure

• Utilizing failover replicas
• Deployment in a different zone within the same region
• Read replicas for high-scaling scenarios

Kafka for Centralized Data Ingestion & Delivery

• Ability to manage offsets within topics
• Publish/subscribe across multiple topics
• Retaining key ordering and messages for extended periods

Apache Hadoop Migration to Google Cloud Platform

• Cost-effective

1. Plastic Materials: Polymers and monomers.

2. Thermoplastics: Softened by heating and can be melted multiple times.

• Polyethylene (PE): Bags, bottles, containers.
• Polystyrene: Packaging, heat insulation.
• Polyvinyl Chloride: High-resistant pipes, cables.
• Polypropylene: Model and dye resistant, toys.
• Polyethylene Terephthalate (PET): Recyclable, transparent dye, bottles.
• Teflon: Resistant to chemicals and high temperatures, used in frying pans.
• Polycarbonate: Resistant to impact and heat.

Thermosets: Form permanent networks.

• Melamine: Withstands high temperatures and chemicals, used in wooden boards.
• Bakelite: Hard and brittle dark plastic, used for handles of kitchen utensils.
• Polyester Resins: Rigid and brittle, strengthened with fiberglass for swimming

My Favorite Website

The website that I usually visit is NewPCT1. The page is full of text links. The appearance of this page is good, tidy, nice, and easy to use. The site map is well-organized because it divides the content into sections, and it is only necessary to choose the one that you wish to view. The search option arranges content by series, movies, programs, games, and music. Inside each of these sections, you have many subcategories to choose from. It is very comfortable to navigate this website. It has many links, but all are positioned in such a way that it is easy to use.

Unit 11: Networking Fundamentals

• File Server: A file server provides a central storage area for data files.
• Bridge: A bridge is a hardware and software combination

List of Essential ICT Services

1. List the services that must be provided in the new ICT and indicates which are mandatory and which are optional. Solution:

• Service radio and television (RTV): capture, adapt and distribute radio and television signals that reach the building, so they can be interpreted by the user receivers.
• Telephone service available to the public (STDP): providing access to telephone and data transmission through the basic telephone network (TB) or integrated services digital network (ISDN).
• Service broadband telecommunications: to provide access to telecommunications services broadband (television, data, etc.), cable (TBA) or a wireless (SAI), promoting the development of the Digital Home.

2. Description of the Common Area of

DC Machine Problem: Induced EMF and Torque Calculation

This section details the calculation of induced electromotive force (EMF) and internal mechanical torque for a specific DC machine, along with its key parameters.

DC Machine Parameters and Specifications

• Type: 4-pole shunt excitation DC machine
• Power: 11 KW
• Voltage: 440 V
• Speed: 750 rpm
• Winding: 31 slots, 30 conductors per slot (Total conductors, N_c = 31 × 30 = 930)
• Diameter (D): 24 cm (0.24 m)
• Stacking Factor: 71% (0.71)
• Air Gap: 3.1 mm
• Maximum Vacuum Flux Density (B_max): 0.705 T
• Losses: 325 W (at full load)

Key Formulas and Calculations

• Number of Conductors (N_c): N_c = Number of slots × Conductors per slot = 31 × 30 = 930
• Winding Type: The original text mentions "2 winding hilly roads then a = 1".

Q1. Synchronous

1. Asynchronous
2. Isochronous
3. None of the above

Q2. Full Duplex

1. Half Duplex
2. Simplex
3. All of the above

Q3. Modulation

1. De-modulation
2. Multiplexing
3. De-multiplexing

Q4. TDM

1. WDM
2. CDM
3. All of the above

Q5. FDM

1. TDM
2. WDM
3. CDM

Q6. Electrical

1. Light
2. Electromagnetic
3. All of the above

Q7. Less Susceptible

1. More Susceptible
2. Not Susceptible
3. None of the above

Q8. Fiber Optic

1. Twisted Pair Cable
2. Coaxial Cable
3. Both B & C

Q9. Reflected

1. Refracted
2. Travelling along the boundary
3. None of the above

Q10. Digital

1. Analogue
2. Both A & B
3. None of the above

Q11. Phase and in Amplitude

1. Phase and Frequency
2. Amplitude and Frequency
3. All of the above

Q12. Increased Unused Slots

1. Decrease the Unused Slots (Maybe)
2. Eliminating Unused Slots
3. Do Not Deal with Unused Slots

Q13. Mathematical Formula

1. Analogue Signal
2. Digital Signal
3. Any

Understanding Computer Networks

A computer network is a set of computers connected to each other, enabling them to share resources and exchange information. They can share printers, files, folders, and Internet connections.

Ethernet Classification

The two common types of Ethernet networks are 100Base-T and 1000Base-T.

The number indicates the transmission speed in Megabits per second: 100Mbps and 1000Mbps, respectively.

The letter 'T' indicates the type of cable used to transmit data. The cable consists of twisted pairs of copper wire with RJ45 connectors at each end. These cables are used to connect the network.

Types of Cables

• Twisted Pair UTP: 8 copper wires twisted together in 4 pairs with an RJ45 connector at the end.
• STP: A safer cable for transmitting

Wood

Pith: the middle part of the trunk

Heartwood: hardest and darkest, best part for woodwork

Sapwood: recent growth used for more artistic woodwork

Bark: exterior layer, protects the plant from outside attacks

Cambium: thin transparent layer of live cells

Hardwood

Beech: used in furniture and floors because it bends and is easily shaped

Oak: used in parquet floors, boats, etc.

Mahogany: used in joinery, musical instruments, etc.

Softwood

Pine: used in electrical posts, boats, etc.

Silver fir: used in building, carpentry, etc.

White poplar: used in frames, paper, etc.

Engineered Wood

Plywood: formed by gluing together thin sheets with synthetic resins

Chipboard: made with wood shavings and chips which are glued together

Fibreboard: fibers come from grinding

Carpentry