260,872 research outputs found

    An Ontology-Based Approach To Concern-Specific Dynamic Software Structure Monitoring

    Get PDF
    Software reliability has not kept pace with computing hardware. Despite the use reliability improvement techniques and methods, faults remain that lead to software errors and failures. Runtime monitoring can improve software reliability by detecting certain errors before failures occur. Monitoring is also useful for online and electronic services, where resource management directly impacts reliability and quality. For example, resource ownership errors can accumulate over time (e. g. , as resource leaks) and result in software aging. Early detection of errors allows more time for corrective action before failures or service outages occur. In addition, the ability to monitor individual software concerns, such as application resource ownership structure, can help support autonomic computing for self-healing, self-adapting and self-optimizing software. This thesis introduces ResOwn - an application resource ownership ontology for interactive session-oriented services. ResOwn provides software monitoring with enriched concepts of application resource ownership borrowed from real-world legal and ownership ontologies. ResOwn is formally defined in OWL-DL (Web Ontology Language Description Logic), verified using an off-the-shelf reasoner, and tested using the call processing software for a small private branch exchange (PBX). The ResOwn Prime Directive states that every object in an operational software system is a resource, an owner, or both simultaneously. Resources produce benefits. Beneficiary owners may receive resource benefits. Nonbeneficiary owners may only manage resources. This approach distinguishes resource ownership use from management and supports the ability to detect when a resource's role-based runtime capacity has been exceeded. This thesis also presents a greybox approach to concern-specific, dynamic software structure monitoring including a monitor architecture, greybox interpreter, and algorithms for deriving monitoring model from a monitored target's formal specifications. The target's requirements and design are assumed to be specified in SDL, a formalism based on communicating extended finite state machines. Greybox abstraction, applicable to both behavior and structure, provides direction on what parts, and how much of the target to instrument, and what types of resource errors to detect. The approach was manually evaluated using a number of resource allocation and ownership scenarios. These scenarios were obtained by collecting actual call traces from an instrumented PBX. The results of an analytical evaluation of ResOwn and the monitoring approach are presented in a discussion of key advantages and known limitations. Conclusions and recommended future work are discussed at the end of the thesis

    Remote operation and monitoring of a micro aero gas turbine

    Get PDF
    Internet applications have been extended to various aspects of everyday life and offer services of high reliability and security at relatively low cost. This project presents the design of a reliable, safe and secure software system for real-time remote operation and monitoring of an aero gas turbine with utilisation of existing internet technology, whilst the gas turbine is installed in a remote test facility This project introduces a capability that allows remote and flexible operation of an aero gas turbine throughout the whole operational envelope, as required by the user at low cost, by exploiting the available Internet technology. Remote operation of the gas turbine can be combined with other remote Internet applications to provide very powerful gas-turbine performance-simulation experimental platforms and real-time performance monitoring tools, whilst keeping the implementation cost at low levels. The gas turbine used in this experiment is an AMT Netherlands Olympus micro gas turbine and a spiral model approach was applied for the software. The whole process was driven by risk mitigation. The outcome is a fully functional software application that enables remote operation of the micro gas turbine whilst constantly monitors the performance of the engine according to basic gas turbine control theory. The application is very flexible, as it runs with no local installation requirements and includes provisions for expansion and collaboration with other online performance simulation and diagnostic tools. This paper will be presented at the ISABE 2017 Conference, 5-8 September 2017, Manchester, UK

    Evaluasi Kualitas Online Monitoring Sistem Perbendaharaan Dan Anggaran Negara Berdasarkan Aspek Integrity, Correctness, Dan Reliability - Quality Evaluation Of Online Monitoring System Of Treasury And State Budget Based On Integrity, Correctness And Reliability Aspects

    Get PDF
    Aplikasi Online Monitoring Sistem Perbendaharaan dan Anggaran Negara (OM SPAN) merupakan aplikasi pendukung Sistem Perbendaharaan dan Anggaran Negara (SPAN) yang menjalankan fungsi monitoring atas transaksi di dalam sebuah sistem yang mengintegrasikan pengelolaan perbendaharaan dan anggaran negara. Data dan informasi yang dikelola merupakan data yang sangat penting yaitu terkait pengelolaan keuangan dan anggaran negara. Mengingat krusialnya data yang diolah dan yang ditampilkan pada aplikasi ini, dibutuhkan sebuah evaluasi kualitas guna meninjau bagaimana kualitas yang disajikan serta dikarenakan belum pernah dilakukan evaluasi kualitas atas aplikasi ini sebelumnya. Di dalam McCall Quality Model terdapat sebelas faktor evaluasi kualitas perangkat lunak antara lain : correctness, reliability, efficiency, integrity, usability, maintainability, testability, flexibility, portability, reusability, dan interoperability. Penelitian Tugas Akhir ini bertujuan untuk memaparkan evaluasi kualitas aplikasi OM SPAN ditinjau dari aspek Integrity, Correctness dan Reliability. Tiap-tiap aspek memiliki beberapa kriteria kualitas yang diukur berdasarkan metrik pada ISO/IEC 9126:2002. Evaluasi kualitas ini didasarkan pada wawancara, kuesioner , observasi langsung, pengujian berdasarkan test case scenario dan pengumpulan data/dokumentasi arsip. Hasil pengujian ini kemudian dihitung dengan formula Bowen untuk tiap aspek kualitas. Untuk aspek integrity diperoleh nilai 100% sebagai indikasi suksesnya pelaksanaan access audit dan monitoring akses user. Untuk aspek correctness diperoleh skor 95,87% atas kesesuaian dan ketepatan (correctness) implementasi kebutuhan fungsional. Sedangkan untuk aspek reliability mendapatkan nilai 95,25% untuk kehandalan (reliability) aplikasi OM SPAN di dalam menyajikan data dan informasi yang tepat dan akurat. Selanjutnya penyampaian rekomendasi atas hasil evaluasi kualitas kepada pihak pengembang guna kebutuhan perbaikan dan peningkatan kualitas aplikasi Online Monitoring Sistem Perbendaharaan dan Anggaran Negara pada masa mendatang. ======================================================================================================================== Online Monitoring System of Treasury And State Budget (OM SPAN) is supporting application of Treasury and the State Budget System (SPAN) that performs transaction monitoring function within a system that integrates the management of the treasury and the state budget. The data and information are managed in this system are highly important that is related to financial management and the state budget. Given the crucial data is processed and displayed in this application, a quality evaluation is required to observe how the quality being served as well as the evaluation has not been done due to the quality of the application before. In McCall Quality Model there are eleven software quality evaluation factors, among others: correctness, reliability, efficiency, integrity, usability, maintainability, testability, flexibility, portability, reusability and interoperability. This paper aims to describe the quality evaluation of OM SPAN application in terms of Integrity, Correctness and Reliability aspects. Each aspects has several quality criteria that are measured by the metric on ISO/IEC 9126:2002. This quality evaluation is based on interviews, questionnaires, direct observation, testing based on test case scenarios and data collection / documentation archives. The test results are calculated by the Bowen’s formula for each quality aspects. For the integrity aspect has value 100% as an indication of the successful implementation of access audit and monitoring user access. For the correctness aspect obtained 95,87% of the suitability and correctness the implementation of functional requirements. As for the aspect of reliability scores 95,25% for reliability of OM SPAN application is presenting data and information which is precise and accurate. The next delivery of recommendations over the quality of the evaluation results to the developer in order to repair and quality improvement Online Monitoring System of Treasury and State Budget application in the future

    Real-Time Monitoring and Control of Ultra-Fast Laser Engraving Process Utilizing Spectrometer

    Get PDF
    The objective of this study was to develop a novel real-time monitoring and control method for ultra-fast laser scribing processes utilizing spectrometer. Adjustment of laser process parameters such as laser power with high precision in real-time is critical in the laser engraving process due to the premium quality and speed requirements of the process. An online monitoring system was established using the Ocean Optics spectrometer, IPG ytterbium pulsed laser, and PXIe-8880 industrial computer. An algorithm for real-time control of the laser scribing process was developed based on the monitoring outcomes using LabVIEWⓇ software. Experimental methods were performed to evaluate the reliability of the developed monitoring system and control algorithm. The sensitivity of the spectrometer was assessed by changing laser power, pulse length, and focal point position. A workpiece consisting of two different metals, including stainless steel SS304L and steel S355, was used to evaluate the performance of the developed algorithm when scribing moved from one material to another. Instant accurate setting of the laser power based on the variations in intensities of metals from 750 AU to 1400 AU validated the reliability of the algorithm.</p

    Wind turbine condition monitoring : technical and commercial challenges.

    Get PDF
    Deployment of larger scale wind turbine systems, particularly offshore, requires more organized operation and maintenance strategies to ensure systems are safe, profitable and cost-effective. Among existing maintenance strategies, reliability centred maintenance is regarded as best for offshore wind turbines, delivering corrective and proactive (i.e. preventive and predictive) maintenance techniques enabling wind turbines to achieve high availability and low cost of energy. Reliability centred maintenance analysis may demonstrate that an accurate and reliable condition monitoring system is one method to increase availability and decrease the cost of energy from wind. In recent years, efforts have been made to develop efficient and cost-effective condition monitoring techniques for wind turbines. A number of commercial wind turbine monitoring systems are available in the market, most based on existing techniques from other rotating machine industries. Other wind turbine condition monitoring reviews have been published but have not addressed the technical and commercial challenges, in particular, reliability and value for money. The purpose of this paper is to fill this gap and present the wind industry with a detailed analysis of the current practical challenges with existing wind turbine condition monitoring technology

    Advanced Techniques for Assets Maintenance Management

    Get PDF
    16th IFAC Symposium on Information Control Problems in Manufacturing INCOM 2018 Bergamo, Italy, 11–13 June 2018. Edited by Marco Macchi, László Monostori, Roberto PintoThe aim of this paper is to remark the importance of new and advanced techniques supporting decision making in different business processes for maintenance and assets management, as well as the basic need of adopting a certain management framework with a clear processes map and the corresponding IT supporting systems. Framework processes and systems will be the key fundamental enablers for success and for continuous improvement. The suggested framework will help to define and improve business policies and work procedures for the assets operation and maintenance along their life cycle. The following sections present some achievements on this focus, proposing finally possible future lines for a research agenda within this field of assets management

    Internet of Things-aided Smart Grid: Technologies, Architectures, Applications, Prototypes, and Future Research Directions

    Full text link
    Traditional power grids are being transformed into Smart Grids (SGs) to address the issues in existing power system due to uni-directional information flow, energy wastage, growing energy demand, reliability and security. SGs offer bi-directional energy flow between service providers and consumers, involving power generation, transmission, distribution and utilization systems. SGs employ various devices for the monitoring, analysis and control of the grid, deployed at power plants, distribution centers and in consumers' premises in a very large number. Hence, an SG requires connectivity, automation and the tracking of such devices. This is achieved with the help of Internet of Things (IoT). IoT helps SG systems to support various network functions throughout the generation, transmission, distribution and consumption of energy by incorporating IoT devices (such as sensors, actuators and smart meters), as well as by providing the connectivity, automation and tracking for such devices. In this paper, we provide a comprehensive survey on IoT-aided SG systems, which includes the existing architectures, applications and prototypes of IoT-aided SG systems. This survey also highlights the open issues, challenges and future research directions for IoT-aided SG systems
    • …
    corecore