Reason Maintenance Systems

1988 ◽  
pp. 1-26 ◽  
Author(s):  
Michael Reinfrank
Keyword(s):  
Maintenance Systems ◽  
Reason Maintenance

FUZZY IF-THEN-UNLESS RULES AND THEIR IMPLEMENTATION

1993 ◽  
Vol 01 (02) ◽  
pp. 167-182 ◽  
Author(s):  
PATRICK DOHERTY ◽  
DIMITER DRIANKOV ◽  
HANS HELLENDOORN
Keyword(s):  
Causal Relationship ◽  
Fuzzy Rules ◽  
Inference Rules ◽  
Ternary Relation ◽  
Degree Of Membership ◽  
Maintenance Systems ◽  
Context Dependent ◽  
Reason Maintenance

We consider the possibility of generalizing the notion of a fuzzy If-Then rule to take into account its context dependent nature. We interpret fuzzy rules as modeling a forward directed causal relationship between the antecedent and the conclusion, which applies in most contexts, but on occasion breaks down in exceptional contexts. The default nature of the rule is modeled by augmenting the original If-Then rule with an exception part. We then consider the proper semantic correlate to such an addition and propose a ternary relation which satisfies a number of intuitive constraints described in terms of a number of inference rules. In the rest of the paper, we consider implementational issues arising from the unless extension and propose the use of reason maintenance systems, in particular TMS's, where a fuzzy If-Then-Unless rule is encoded into a dependency net. We verify that the net satisfies the constraints stated in the inference schemes and conclude with a discussion concerning the integration of qualitative IN-OUT labelings of the TMS with quantitative degree of membership labelings for the variables in question.

THE PROBLEM OF PROVIDING CACHE COHERENCE IN MULTIPROCESSOR SYSTEMS WITH MANY PROCESSORS

2018 ◽  
pp. 47-53
Author(s):  
B. Z. Shmeylin ◽  
E. A. Alekseeva
Keyword(s):  
Cache Coherence ◽  
Bloom Filters ◽  
Multiprocessor Systems ◽  
Cache Line ◽  
Maintenance Systems ◽  
Processor Caches ◽  
Conventional Systems ◽  
Additional Hardware

In this paper the tasks of managing the directory in coherence maintenance systems in multiprocessor systems with a large number of processors are solved. In microprocessor systems with a large number of processors (MSLP) the problem of maintaining the coherence of processor caches is significantly complicated. This is due to increased traffic on the memory buses and increased complexity of interprocessor communications. This problem is solved in various ways. In this paper, we propose the use of Bloom filters used to accelerate the determination of an element’s belonging to a certain array. In this article, such filters are used to establish the fact that the processor belongs to some subset of the processors and determine if the processor has a cache line in the set. In the paper, the processes of writing and reading information in the data shared between processors are discussed in detail, as well as the process of data replacement from private caches. The article also shows how the addresses of cache lines and processor numbers are removed from the Bloom filters. The system proposed in this paper allows significantly speeding up the implementation of operations to maintain cache coherence in the MSLP as compared to conventional systems. In terms of performance and additional hardware and software costs, the proposed system is not inferior to the most efficient of similar systems, but on some applications and significantly exceeds them.

scholarly journals Advantages and potential challenges of data management in e-maintenance

2019 ◽  
Vol 25 (3) ◽  
pp. 378-396 ◽  
Author(s):  
Arian Razmi-Farooji ◽  
Hanna Kropsu-Vehkaperä ◽  
Janne Härkönen ◽  
Harri Haapasalo
Keyword(s):  
Data Management ◽  
Design Methodology ◽  
Management Practices ◽  
Future Research ◽  
Conceptual Approach ◽  
Content Type ◽  
Different Types ◽  
Maintenance Systems ◽  
Industry Leader ◽  
Practical Implications

Purpose The purpose of this paper is twofold: first, to understand data management challenges in e-maintenance systems from a holistically viewpoint through summarizing the earlier scattered research in the field, and second, to present a conceptual approach for addressing these challenges in practice. Design/methodology/approach The study is realized as a combination of a literature review and by the means of analyzing the practices on an industry leader in manufacturing and maintenance services. Findings This research provides a general understanding over data management challenges in e-maintenance and summarizes their associated proposed solutions. In addition, this paper lists and exemplifies different types and sources of data which can be collected in e-maintenance, across different organizational levels. Analyzing the data management practices of an e-maintenance industry leader provides a conceptual approach to address identified challenges in practice. Research limitations/implications Since this paper is based on studying the practices of a single company, it might be limited to generalize the results. Future research topics can focus on each of mentioned data management challenges and also validate the applicability of presented model in other companies and industries. Practical implications Understanding the e-maintenance-related challenges helps maintenance managers and other involved stakeholders in e-maintenance systems to better solve the challenges. Originality/value The so-far literature on e-maintenance has been studied with narrow focus to data and data management in e-maintenance appears as one of the less studied topics in the literature. This research paper contributes to e-maintenance by highlighting the deficiencies of the discussion surrounding the perspectives of data management in e-maintenance by studying all common data management challenges and listing different types of data which need to be acquired in e-maintenance systems.

Reason-maintenance Belief Logic with Uncertain Information

2020 ◽  
Vol 21 (1) ◽  
pp. 1-32
Author(s):  
Tuan-Fang Fan ◽  
Churn-Jung Liau
Keyword(s):  
Uncertain Information ◽  
Reason Maintenance ◽  
Belief Logic

Who Cares for the Family?

1978 ◽  
Vol 7 (3) ◽  
pp. 257-284 ◽  
Author(s):  
Hilary Land
Keyword(s):  
Labour Market ◽  
Domestic Workers ◽  
Careful Examination ◽  
Family Policies ◽  
Adult Men ◽  
The Family ◽  
The Disabled ◽  
Unpaid Labour ◽  
Maintenance Systems ◽  
The Impact

ABSTRACTAlthough Britain has never had a set of policies explicitly labelled ‘family policies’, most if not all social policies are implicitly family policies because they are based on certain assumptions about the nature of relationships between the sexes and the generations. By careful examination of the detail of the legislation and administrative rules, together with the way in which services are allocated and used, it is possible to expose these assumptions and show that they are not only consistent between policies but very persistent over time. This paper first examines the assumptions concerning the division of unpaid labour within the family whereby women care for the young, the sick and the old and for able-bodied adult men (their husbands). The examples are selected from a variety of income maintenance systems and services for children, the old and the disabled. Particular attention is focused on the extent to which it is recognized that women are at the same time workers in the labour market and unpaid domestic workers in the home. The second part of the paper analyses the impact on their participation and opportunities in the labour market of the ideology which accords to women the primary responsibilities for caring for other members of their family. The perpetuation of such an ideology favours the interests of men and frequently the interests of the economically powerful, but it is not assumed that these interests always coincide.

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