HRM 3450 Lecture Notes - Lecture 21: Java Virtual Machine, The American Heritage Dictionary Of The English Language, Virtual Memory
5 May 2018
School
Department
Course
Professor
HRM 3450 Lecture 21 Notes – The concept of virtualization
Introduction
• The od itual appeas feuetly thoughout the opute liteatue i ay
different contexts.
• To name a few applications of the word that appears, there are virtual computers, a
Java Virtual Machine, virtual memory, and virtual networks.
• Sometimes, a synonymous word, logical, is used instead: in networking we have logical
connections.
• Virtual storage consists of a relationship between logical memory and physical memory.
• It is not important at this point that you understand any of the specific concepts
mentioned above.
• I fat, e ealize that you poaly dot.
• Since the words virtual and logical represent a number of important concepts, however,
we introduce them here.
• In optics, a virtual image is the reflection that you see when you stand in front of a
regular mirror.
• See, for example, the cartoon at the beginning.
• You know that the image ist eal.
• Fo oe thig, its ehid the all that the io is outed o.
• Fo aothe, you at touh it.
• In early, time-shared computing, a large central computer commonly supplied
computing services to users at terminals located remotely from the computer.
• In a sense, it seemed as though the user had access to a computer that was all her own.
• Starting in the early 1970s, IBM offered the VM (virtual machine) operating system to
support this concept.
• The American Heritage Dictionary offers two applicable definitions of virtual that
together describe the usage of the word in modern computing
• Existing or resulting in essence or effect though not in actual fact, form, or name
find more resources at oneclass.com
find more resources at oneclass.com
