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Article

Jian‐Guo Zhang, A.B. Sharma, Yu‐De Ni and Zheng Li

The design issues on network architecture and modulation scheme that can be used to implement reliable MIL‐STD‐1773 avionics optical fiber data buses are discussed. Both…

Abstract

The design issues on network architecture and modulation scheme that can be used to implement reliable MIL‐STD‐1773 avionics optical fiber data buses are discussed. Both single‐star and multi‐star architectures are presented to such optical fiber data buses. Several network configurations based on passive and/or active coupling components are also considered, and they are compared in terms of system complexity and reliability. Moreover, three modulation schemes are presented, i.e. partial trilevel Manchester II bi‐phase coding, extended Manchester II bi‐phase coding with beginning‐stopping flags, and pseudo‐four‐ary pulse width modulation, respectively. Their use can feasibly solve the problem associated with fast identification of correct operation states of an active transmitter at the output of optical receivers.

Details

Aircraft Engineering and Aerospace Technology, vol. 72 no. 2
Type: Research Article
ISSN: 0002-2667

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Article

D. K. Rawal, Mangey Ram and V. V. Singh

– The purpose of this paper is to find the reliability measures of Linux operating system connected in local area network (LAN).

Abstract

Purpose

The purpose of this paper is to find the reliability measures of Linux operating system connected in local area network (LAN).

Design/methodology/approach

The system has two different topologies, i.e. star topology (subsystem-1) and bus topology (subsystem-2), are placed at two different places, and connected to a server through a hub. Both the topologies have n clients. The system has partial failure and complete failure. The partial failure is of two type’s namely minor partial and major partial. The minor partial failure degrades the system whereas the major partial failure brings the system to a break down mode. The system can completely fail due to failure of server hacking and blocking.

Findings

By using supplementary variable technique and Laplace transformation, by taking different types of failure and two types of repairs the availability, non-availability, mean time to failure and cost analysis (expected profit) of the design system have been obtained.

Originality/value

In this research, a mathematical model of Linux operating system has been discussed from which one can check the behavioral analysis of the designed system.

Details

International Journal of Quality & Reliability Management, vol. 32 no. 1
Type: Research Article
ISSN: 0265-671X

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Article

Lixuan Lu and Jianhe Lei

Proper function of landing gear plays a crucial role in the safe operation of an airplane. Traditional landing gear control system utilizes centralized control technology…

Abstract

Purpose

Proper function of landing gear plays a crucial role in the safe operation of an airplane. Traditional landing gear control system utilizes centralized control technology. The relatively heavy wire harness and low reliability accompanied with this technology make it logical to transfer from traditional control to real‐time distributed control. This paper aims to look into a new landing gear control system based on time‐triggered architecture (TTA).

Design/methodology/approach

In this paper, a new landing gear control system based on TTA is proposed. The reliability of the proposed system is investigated using a combination of Markov analysis and MIL‐HDBK‐217 methods.

Findings

The results show that by integration of TTP/C and TTP/A technologies, the advantages of both are achieved. A very high level of reliability is obtained. This increases the confidence when adopting distributed landing gear control technology.

Originality/value

The paper presents a new landing gear control system based on TTA, the reliability of which is very high.

Details

Aircraft Engineering and Aerospace Technology, vol. 82 no. 1
Type: Research Article
ISSN: 0002-2667

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Article

Larry L. Learn

This article provides a broad overview of telecommunications and network‐related technologies. Topics covered include identification and review of network elements, analog…

Abstract

This article provides a broad overview of telecommunications and network‐related technologies. Topics covered include identification and review of network elements, analog and digital signals, synchronous and asynchronous transmission formats, transmission media and equipment, transmission techniques and characteristics, multiplexing, network types, access technologies, network architectures and topologies, local‐area network technologies and attributes, protocols and protocol issues, gateways, internetworking, local networking alternatives, equipment certification, and various aspects of network management. It is intended to provide the practicing professional in the field of library and information science with a broad, up‐to‐date technical review that might serve to support and facilitate further investigation of current developments in networks and networking. Although the broad range of topics is not treated in depth, numerous references are provided for further investigation.

Details

Library Hi Tech, vol. 6 no. 2
Type: Research Article
ISSN: 0737-8831

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Article

Avi Rushinek and Sara F. Rushinek

Suggests that, though local area networking is one of the fastestgrowing segments in the computer industry, the selection of appropriatefeatures for inclusion in local…

Abstract

Suggests that, though local area networking is one of the fastest growing segments in the computer industry, the selection of appropriate features for inclusion in local area networks (LANs) can be confusing for both vendors and end‐users. Describes a system that measures the degree to which specific LAN features meet end‐user needs and contribute to profitability. Reveals that, in the analysis, the features file security and remote access had positive effects on the overall LAN price. Provides a methodology for selecting the most profitable features, such as remote access and gateways to PC networks, to include in a contemplated LAN product line.

Details

Industrial Management & Data Systems, vol. 94 no. 2
Type: Research Article
ISSN: 0263-5577

Keywords

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Article

Renuganth Varatharajoo and Mohamad Tarmizi Ahmad

Flywheels can serve not only as attitude control devices, but also as energy storage devices, thereby eliminating the need for conventional batteries. Hence, a combined…

Abstract

Flywheels can serve not only as attitude control devices, but also as energy storage devices, thereby eliminating the need for conventional batteries. Hence, a combined energy and attitude control system (CEACS) consisting of a double counter rotating flywheel assembly is proposed for small satellites in this paper. The energy level in CEACS depends mainly on the flywheels' speeds. Therefore, a specific flywheel energy management strategy has to be implemented to take into account the limitations of the flywheels, which has not been established until today.

Details

Aircraft Engineering and Aerospace Technology, vol. 76 no. 4
Type: Research Article
ISSN: 0002-2667

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Article

Oghenevwogaga Benson Adogbeji and Esharenana E. Adomi

The study reports on the decision to go forward with plans for library automation, and its details, including the number of computers/their capacity, the networking…

Abstract

Purpose

The study reports on the decision to go forward with plans for library automation, and its details, including the number of computers/their capacity, the networking pattern used in the automation of the Delta State library and the operating systems. A review of the library software currently in use – X‐LIB, and the general features of the software, the required training in general computer application and how to use the X‐LIB, and handle data entry and retrospective conversion is covered. The article also speculates about the future plan of the library and the constraints it may experience due to the automation plan.

Design/methodology/approach

The work was based on the report/experience of the Delta State University library in implementing automation with the use of X‐LIB. The researcher adopted a descriptive method to reveal the state of automation of the university library and the experience to date. This is a descriptive case study about implementation of X‐LIB software.

Findings

Automation requires intensive staff training and forces future planning for subsequent phases and developments. Research limitations/implications The obvious implications are scale and financial resources, staff development and how far in the future a library wants to stage this phase of implementation. Many libraries already have invested in this process and refined it but in cases like this institution, library automation is still young.

Practical Implications

Useful, practical insights based on local experience is what is described.

Value

As a case study other libraries considering this product or going in this direction will find this submission of interest.

Details

Library Hi Tech News, vol. 22 no. 5
Type: Research Article
ISSN: 0741-9058

Keywords

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Article

V. V. Singh, Abubakkar Idris Mohhammad, Kabiru Hamisu Ibrahim and Ibrahim Yusuf

This paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers…

Abstract

Purpose

This paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The computed results are more supportable for repairable system performability analysis.

Design/methodology/approach

In this paper, the authors have analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The supplementary variable technique has employed for analyzing the performance of the system.

Findings

Reliability measures have been computed for different types of configuration. It generalized the results for purely series and purely parallel configurations.

Research limitations/implications

This research may be beneficial for industrial system performances whereas a k-out-of-n-type configuration exists.

Practical implications

Not sure as it is a theoretical assessment.

Social implications

This research may not have social implications.

Originality/value

This work is the sole work of authors that have not been communicated to any other journal before.

Details

International Journal of Quality & Reliability Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0265-671X

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Article

Fiaz Ahmad, Akhtar Rasool, Esref Emre Ozsoy, Asif Sabanoviç and Meltem Elitas

The purpose of this paper is to propose successive-over-relaxation (SOR) based recursive Bayesian approach (RBA) for the configuration identification of a Power System…

Abstract

Purpose

The purpose of this paper is to propose successive-over-relaxation (SOR) based recursive Bayesian approach (RBA) for the configuration identification of a Power System. Moreover, to present a comparison between the proposed method and existing RBA approaches regarding convergence speed and robustness.

Design/methodology/approach

Swift power network configuration identification is important for adopting the smart grid features like power system automation. In this work, a new SOR-based numerical approach is adopted to increase the convergence speed of the existing RBA algorithm and at the same time maintaining robustness against noise. Existing RBA and SOR-RBA are tested on IEEE 6 bus, IEEE 14 bus networks and 48 bus Danish Medium Voltage distribution network in the MATLAB R2014b environment and a comparative analysis is presented.

Findings

The comparison of existing RBA and proposed SOR-RBA is performed, which reveals that the latter has good convergence speed compared to the former RBA algorithms. Moreover, it is robust against bad data and noise.

Originality value

Existing RBA techniques have slow convergence and are also prone to measurement noise. Their convergence speed is effected by noisy measurements. In this paper, an attempt has been made to enhance convergence speed of the new identification algorithm while keeping its numerical stability and robustness during noisy measurement conditions. This work is novel and has drastic improvement in the convergence speed and robustness of the former RBA algorithms.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 36 no. 4
Type: Research Article
ISSN: 0332-1649

Keywords

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Article

Włodzimierz Kalita and Kazimierz Kamuda

The paper focuses on CAN‐bus based systems: a determination of the configuration parameters by analysis of their characteristic structure, topology conditions and…

Abstract

Purpose

The paper focuses on CAN‐bus based systems: a determination of the configuration parameters by analysis of their characteristic structure, topology conditions and transmission properties.

Design/methodology/approach

Voltage measurements were made in a test circuit of CAN‐bus together with calculations of adequate waveforms with the help of elaborated programs. The signal parameters transmitted in bus lines were logged and measured using digital oscilloscope.

Findings

The results allow some conclusions to be drawn about the correctness of assumptions in realising the configuration

Originality/value

The results of the investigations have proved the possibilities of parameters calculation, required to choose relevant CAN controller configuration during the design.

Details

Microelectronics International, vol. 24 no. 2
Type: Research Article
ISSN: 1356-5362

Keywords

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