Understanding Processes, System Calls, and Pipes in Unix-like Systems

Posted by on May 29, 2024 in Computers | 0 comments

32bit: 4 byte int, 4 byte long and pointer is 4 bytes
64bit: 4 byte int, 8 byte long and pointer is 8 bytes

File descriptor: a small non-negative integer that is a reference to an open file
Use open() gain access to a file
Use read(fd, buf, size) to read bytes from a file
Use write(fd, buf, size) to write bytes to a file
Before compilation, C source files are preprocessed (e.G., translated)
The C Preprocessor (cpp) handles: Include files: #include<foo.H>, Macro expansion: #define NMAX 3, Conditional
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A Guide to Java Enterprise Edition Technologies: JavaBeans, ODBC, RMI, and JSP

Posted by on May 29, 2024 in Computers | 0 comments

1. What is JavaBeans?

JavaBeans is a component architecture for the Java programming language, developed to provide reusable software components. These components, known as beans, are manipulated visually in a builder tool. A JavaBean is a simple Java class that follows specific conventions: it must have a no-argument constructor, properties with getter and setter methods, and it must be serializable, allowing its state to be persisted and restored. JavaBeans enable easy integration and customization

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Components Basics

Posted by on May 29, 2024 in Computers | 0 comments

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Components Basics

Base Example

Here’s an example of a Vue component:

// Define a new component called button-counter

Vue.Component(‘button-counter’, {
Data

function () {
return {
      count: 0
    }
  },
  template: 
‘You clicked me {{ count }} times.’

})
Components are reusable Vue instances with a name: in this case, <button-counter>. We can use this component as a custom element inside a root Vue instance 
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Key Attributes of Requirements and Their Transformational Effects


				
Posted  by  on May 28, 2024 in Computers | 0 comments

	
	
	
Attributes of a Single Requirement
  • Agreed: stakeholders established sufficient agreement about the requirement
  • Atomic: the requirement describes only a single, coherent fact.
  • Complete: does not omit any relevant information for some stakeholder and doesn’t need any further explanations.
  • Feasible
  • Rated (prioritized): each requirement must be ranked against others according to importance
  • Verifiable
  • Unambiguous
    • Shall: (Required)
    • Will: (Intention): prospective
    • Should (Suggestion): strongly advised
    • May: desirable 
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Different Types of Antenna Used In Mobile Communication


				
Posted  by  on May 28, 2024 in Computers | 0 comments

	
	
	
1. Monopole Antenna:
  • A monopole antenna is a single vertical rod or wire mounted on a ground plane.
  • It is omnidirectional, meaning it transmits and receives signals in all directions perpendicular to the antenna’s axis.
  • Monopole antennas are commonly used in mobile devices due to their simplicity and effectiveness.
2. Dipole Antenna:
  • A dipole antenna consists of two conductive elements, often rods or wires, positioned in a line and fed at their center.
  • It is also omnidirectional and is commonly used in 
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Exploring Disk Storage and Cache Optimization: Solutions to Common Problems


				
Posted  by  on May 28, 2024 in Computers | 0 comments

	
	
	
Assume:
  • Bits Per Track
  • Track Count
  • M, K are constant
So:
  • Bit Count
  • When x == 1/2, bc is maximum
T_avg_seek = 4ms
T_avg_rotation = 1/2 * 1/15000 * 60s/min * 1000ms/s = 2ms
T_avg_transfer = 1/15000 * 1/800 * 60s/min * 1000ms/s = 0.005ms
So:
T_access = 6.005ms
Almost same as problem 6.4 in the book.
A.
Best case: Blocks are mapped sequentially and on the same cylinder. Just seek data once.
File size 2MB, block size 512B, block count 2MB/512B = 4000
Block Per Track = 1000, so we need to rotate 4 times to read all data.
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