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3 years ago

8

A device that modulates digital data onto an analog signal and then demodulates the analog signal back to digital data is a ____

.

Computers and Technology

1 answer:

LenKa [72]3 years ago

5 0

A modem. (From modulator-demodulator)

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Consider a pipelined processor with just one level of cache. assume that in the absence of memory delays, the baseline cpi of th

babunello [35]

Alternative 1:A small D-cache with a hit rate of 94% and a hit access time of 1 cycle (assume that no additional cycles on top of the baseline CPI are added to the execution on a cache hit in this case).Alternative 2: A larger D-cache with a hit rate of 98% and the hit access time of 2 cycles (assume that every memory instruction that hits into the cache adds one additional cycle on top of the baseline CPI). a)[10%] Estimate the CPI metric for both of these designs and determine which of these two designsprovides better performance. Explain your answers!CPI = # Cycles / # InsnLet X = # InsnCPI = # Cycles / XAlternative 1:# Cycles = 0.50*X*2 + 0.50*X(0.94*2 + 0.06*150)CPI= 0.50*X*2 + 0.50*X(0.94*2 + 0.06*150) / X1= X(0.50*2 + 0.50(0.94*2 + 0.06*150) ) / X= 0.50*2 + 0.50(0.94*2 + 0.06*150)= 6.44Alternative 2:# Cycles = 0.50*X*2 + 0.50*X(0.98*(2+1) + 0.02*150)CPI= 0.50*X*2 + 0.50*X(0.98*(2+1) + 0.02*150) / X2= X(0.50*2 + 0.50(0.98*(2+1) + 0.02*150)) / X= 0.50*2 + 0.50(0.98*(2+1) + 0.02*150)= 3.97Alternative 2 has a lower CPI, therefore Alternative 2 provides better performance.

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2 years ago

Which of the following allows data to coordinate activity between devices? Select one: a. Address bus b. Collisions c. Data bus

AnnyKZ [126]

Answer:

The correct option is D: Control Bus

Explanation:

A control bus is usually used by the Central Processing Unit to communicate with all the devices that are connected or contained within a computer. This connections are usually done via physical connections such as printed circuits or cables. It is also called a Computer bus and helps in coordinating activities between the connected devices.

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3 years ago

Classify each of the cost items (a-h) into one of the business functions of the value chain Cost Item Value Chain Business Funct

rewona [7]

Answer:

Explanation:

a)In this process, the power, electricity, water, etc consumed by the Production department are assembled.

b)In this department, the products are processed and shipped to the retail customers. The costs required for shipping the Latitude line of products comes under the Distribution department.

c)The activities like planning, designing, white box and black box testing are done in the Design process of a product.

d. Salary of computer scientist working on the next generation of servers related to Development.

e. Cost of Dell employees' visit to a major customer to demonstrate Dell?s ability to interconnect with other computers related to Customer Service or Marketing.

f)The cost required for testing the products comes under the Research and development.

g)Marketing department includes the costs of market research, selling the products and other business costs.

h)Purchasing the cartridges from the external suppliers comes under the production department.

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3 years ago

Which two security regulations does the PCI enforce with regard to electronic banking?

Sever21 [200]

The two security regulations the PCI enforce in regards to electronic banking are an external Qualified Security Assessor (QSA) or by a firm specific Internal Security Assessor that creates a Report on Compliance for organizations handling large volumes of transactions, or by Self-Assessment Questionnaire (SAQ) for companies handling smaller volumes.

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3 years ago

Read 2 more answers

Describe the three-schema architecture. Why do we need mappings among schema levels? How do different schema definition language

VARVARA [1.3K]

Answer:

Three Scheme architecture contains internal level, conceptual level, and external level.

In the internal level physical structure of the database described. The internal Schema is also known as physical Schema, as it is used to define the data that stored in a block. Internal Schema describes a sophisticated level of data structure in detail.

The conceptual level design of the database has described, and it is known as a logical level. The conceptual level describes the whole structure of the database. It describes the relationships among the data. Implementation of data are hidden in a theoretical level

On the external level, databases contain schemas that represent a different view of the database. Each describes the database that the user interested in and hides the remaining database. The external database is also known as view schema.

Explanation:

The mappings between schema levels happen due to visualization and schema matching. DBMS has three schema level.

In the attached diagram

It shows the DBMS architecture.

Mapping is a way to transfer and respond to the request between the various database architecture.

Mapping takes more time to transfer data in small DBMS.

External / Conceptual mapping transforms the data from the outer level to the conceptual schema.

In Conceptual / Internal mapping, response transforms from conceptual to internal level.

Document Schema Definition Language (DSDL) is a framework in which multiple validations can be applied to achieve a complete validation result. In this way, schema definition language support this architecture.

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3 years ago