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

• Emulation is the process of mimicking the outwardly observable behavior to match an existing target. The internal state of the emulation mechanism does not have to accurately reflect the internal state of the target which it is emulating.Simulation, on the other hand, involves modeling the underlying state of the target. 
• 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 = For analysis and study but Emulation = For usage as a substituteEmulators focus on recreating the behavior of a system, with no regard for how the system functions internally. Simulators2 focus on modeling the components of a system. You use an emulator when you care mostly about what a system does, and a simulator when you care about how it does it.

Bitcoin

IDC infographic library

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