Reliability theory is a major concern for engineers and managers engaged in making high
quality products and designing highly reliable systems.“Advanced Reliability Models and …

This chapter proposes some kinds of checkpoint systems with general structures, tasks and
schemes. We have already considered redundancy techniques which are duplex and …

We propose optimal checkpointing models for dual and majority decision structures with
imperfect checkpoints. In systems with high reliability, the process returns to the previous …

This chapter takes up a high-reliability computing system with redundancy techniques and
recovery methods to prevent failure occurrences. We adopt duplex and majority decision …

We have a job with N tandem tasks each of which is executed successively until it is
completed. A double modular system of error detection for the processing of each task is …

We take up a computer system with forward and backward recoveries to keep on running
normally. Most computer systems are made of several modules. Even if some modules …

Most computer systems in offices and industries execute successively tasks, each of which
has random processing times. In such systems, some errors often occur due to noises …

In recent years, computers have been used not only to live our daily life, but also to make
and sell good products in industries. Most things have computers within them and are …

Tasks with random processing times of a computer system are executed successively.
Checkpoint methods can be placed at the end of tasks. Two types of checkpoints are called …

Most computer systems in offices and industries execute successively tasks each of which
has random processing times. In such systems, some errors often occur due to noises …