37 Result(s)
within
Chapter
**ufeng Zhao
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Chapter
Approximate Calculations of Maintenance Policies for Weibull Distribution Using Exponential Distribution
It is always easy to get analytical formulas of optimal maintenance policies with exponential failure times in reliability theory, however, it might be difficult sometimes to discuss them theoretically with a ...
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Chapter
Introduction
It has been wellknown that Probability arose in the letter from Pascal to Fermat around 1654 on such questions as the fair division of the stakes in the game of change [1, p. 239].
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Random Age Replacement Model
We consider the age replacement model in which the unit is replaced at time T or at failure, whichever occurs. The following five policies based on the age replacement are taken up: (1) Random replacement, (2) ...
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Periodic Replacement Models
We consider the replacement model in which the unit is replaced at periodic times JT ( \(J=1,2,\dots \) ...
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Which is Better for Standby or Parallel Systems
High system reliability can be achieved by redundancy and maintenance. It was shown by graph that the system can operate for a specified mean time by either the preventive replacement or increasing the number ...
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Which is Better Problems in Backup Models
The data in a computer system are frequently updated by adding or deleting them, and are stored in a computer database system. However, data files in the database are often broken by several errors due to nois...
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Stochastic Redundant Replacement Maintenance Models
Many serious accidents have happened as systems have become large scale and complex, and moreover, advanced nations have almost finished infrastructures and rushed into a maintenance period. Maintenance would ...
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Replacement Model with Minimal Repair
We consider the replacement model in which the unit undergoes minimal repair at failures, and is replaced at a planned time T, at a working time N or at a failure number K.
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Extended Replacement Models
The following three extended replacement models are considered: We take up age replacement with two failure modes such as major minor failures in Sect. 5.1.
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Which is Better Problems in Shock and Damage Models
We consider an operating unit for the total damage due to random shocks which should operate for an infinite time span [1–5].
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Which is Better Problems in Checkpoint Models
It is of great importance to develop the design of computer systems high reliability as human technologies have been rapidly growing up. Most systems consist of computing units which need high reliability an...
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WIB (Which-Is-Better) Problems in Maintenance Reliability Policies
There have been many studies of maintenance policies in reliability theory, so that we have to select better policies that are suitable for objective systems in actual fields, such as age replacement, periodic...
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Chapter and Conference Paper
R-PFN: Towards Precise Object Detection by Recurrent Pyramidal Feature Fusion
Object detection has been widely studied in the last few decades. However, handling objects with different scales is still marked as a challenging requirement. To solve this problem, we explore how to better u...
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Chapter and Conference Paper
A Salient Object Detection Algorithm Based on Region Merging and Clustering
Salient object detection has recently drawn much attention in computer vision such as image compression and object tracking. Currently, various heuristic computational models have been designed. However, extra...
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Average Failure Rate and Its Applications of Preventive Replacement Policies
When a mission arrives at a random time and lasts for an interval, it becomes an important constraint to plan preventive replacement policies, as the unit should provide reliability and no maintenance can be d...
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Chapter and Conference Paper
A Visual Perspective for User Identification Based on Camera Fingerprint
User identification is to identify the online accounts’ identity, which is a critical problem in many applications. The key problem in that is to find a typical pattern from the online accounts data. Differen...
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Periodic Replacement Policies and Comparisons with Their Extended Policies
It has been well known that minimal repairs are widely used in planning periodic replacement policies in reliability engineering. In this chapter, we begin with the standard periodic replacement policies that...
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Replacement Policies with Independent Damages
In general, an operating unit degrades gradually with additive damage cumulated by shocks in a stochastic way.
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Other Maintenance Models
In order to conduct safe and economical maintenance strategy, modeling and analysis of the damage due to shocks in an analytical way plays an important role in reliability theory and engineering.
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Standard Replacement Policies
To begin with, this chapter gives three standard replacement models that have been obtained as basic replacement policies for an operating unit with shock and damage (Nakagawa Shock and damage models in reliab...
