infimum and supremum

DVR

Local storage server of cctv.
Being replaced by cloud storage.
New cctv uses PoE and cloud storage.

NBIoT VS EMTC

EMTC is faster and good for mobile IoT.

AIS' NB-IoT

Classes of ANN

Feedforward neural network VS. Recurrent neural network:
Networks such as the previous one are commonly called feedforward, because their graph is a directed acyclic graph. Networks with cycles are commonly called recurrent.

Cf. wiki

Simulation VS. Emulation

• Simulation focuses on modeling for analysis and study but Emulation aims for usage as a substitute.
• An emulator can replace the original for 'real' use. A simulator is a model for analysis.A remote desktop emulates a PC. If a flight-simulator could transport you from A to B then it would be a flight-emulator.
• Simulation:

Definition: A simulation is an approximate imitation of a system or process.

Purpose: It aims to model the behavior or characteristics of a system without necessarily reproducing its exact internal workings.

Level of abstraction: Simulations often operate at a higher level of abstraction, focusing on overall behavior rather than exact replication.

Performance: Generally faster and less resource-intensive than emulation.

Accuracy: May sacrifice some accuracy for speed and simplicity.

Example: A flight simulator that mimics the experience of flying an aircraft without replicating every detail of the actual aircraft's systems.

• Emulation:

Definition: An emulation is a more exact replication of a system, typically at a lower level.

Purpose: It aims to recreate the functionality of a specific system as accurately as possible.

Level of detail: Emulators typically operate at a lower level, often replicating hardware or software components in detail.

Performance: Generally slower and more resource-intensive than simulation due to the higher level of detail.

Accuracy: Strives for high accuracy, often aiming to be indistinguishable from the original system.

Example: A software emulator that allows you to run games from an old gaming console on a modern computer by replicating the original console's hardware.

• In summary, simulation focuses on modeling overall behavior, while emulation aims for a more exact replication of a system. 

Bitcoin

IDC infographic library

http://infographics.idc.asia/index/infographics#