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Chapter 4 - DSpace at Waseda University

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<strong>Chapter</strong> 3<br />

Rel<strong>at</strong>ed Work<br />

There is a report th<strong>at</strong> more than 90 percent of the computer systems in global are based on<br />

embedded systems. In our routine, embedded systems are widely used these days. Embedded<br />

systems have developed since a computer has invented and extended. However, in recent<br />

years, much <strong>at</strong>tention has been given to the embedded systems because it is becoming<br />

complic<strong>at</strong>ed. In other words, the technology of semiconductor and network has evolved<br />

rapidly. In addition, the technology of software was developed a lot such as multimedia and<br />

internet technology, etc. For example, the smartphone have started various works th<strong>at</strong> are<br />

music player, movie player, game and internet, etc. as more than a simple message transfer<br />

function. The various functions have increased embedded systems complexity [9]. In the past,<br />

embedded systems were simple hardware. However, nowadays embedded systems hardware<br />

increased complexity by advanced hardware and many needs of users. Along with advanced

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