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Toward HAZOP 4.0 Approach for Managing the Complexities of the Hazard and Operability of an Industrial Polymerization Reactor

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IFAC-PapersOnLine 2020年第2期53卷 13593-13600页

作者： R. Mokhtarname A.A. Safavi L. Urbas F. Salimi M.M. Zerafat N. Harasi Advanced Control Laboratory School of Electrical and Computer Engineering Shiraz University Shiraz Iran Mechanical Science and Eng. Dep. Technische Universität Dresden Dresden Germany ADEPP Academy France Nano-chemical Eng. Dep. Shiraz University Shiraz Iran

Conventional HAZOP is a collaborative and multidisciplinary activity to identify the hazards associated to operability of the chemical processes. Then the consequences and required safeguards of each potential deviation or failure are assessed qualitatively one by one. It is performed with the assumption of "one failure at the time" for the process parameters. Furthermore, process complexities such as multiple failures, domino effects, time and amplitude dep.ndent deviations etc. are avoided to keep the HAZOP brainstorming sessions systematic and effective. Therefore, the quality and outcomes of HAZOP study are relatively subjective and dep.nd on the experience and competency of the HAZOP team. This simplified approach cannot fully cover the hazard identification and risk assessment of the complex processes such as polymerization. Furthermore, the incident investigations show that almost all major accidents have occurred due to multiple failures or domino effects. This paper aims at developing a practical methodology in the context of "Industry 4.0" and particularly illustrate how dynamic simulation liberates the HAZOP team from the simplification assumptions such as one failure at the time or neglecting the domino effects during the lifecycle of the complex processes. An industrial styrene bulk free radical polymerization process has been chosen as the case study to dep.ct the applicability of the proposed method. In continuation of this research, the dynamic simulation integrated with Artificial Intelligence (AI) algorithms and Multivariable Process Monitoring (MPM) together with virtual collaboration tools will be invoked towards a more practical and effective HAZOP 4.0 platform. Such a platform can be the foundation of the further Process Safety Management (PSM) elements such as "Operating manuals", "Training and Competency management", "Condition monitoring and predictive maintenance", "Management of Change", "Pre-Start-up Safety Review", etc.

关键词： Dynamic HAZOP Dynamic Simulation Polymerization Plant Process Complexity HAZOP 4.0

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Wayback Machine: A tool to capture the evolutionary behaviour of the bug reports and their triage process in open-source software systems

arXiv

引用

arXiv 2020年

作者： Jahanshahi, Hadi Cevik, Mucahit Navas-Sú, José Başar, Ayşe González-Torres, Antonio Data Science Lab Ryerson University Toronto Canada Computer Engineering Dep. Costa Rica Institute of Technology Cartago Costa Rica

The issue tracking system (ITS) is a rich data source for data-driven decision-making. Different characteristics of bugs, such as severity, priority, and time to fix, provide a clear picture of an ITS. Nevertheless, such information may be misleading. For example, the exact time and the effort spent on a bug might be significantly different from the actual reporting time and the fixing time. Similarly, these values may be subjective, e.g., severity and priority values are assigned based on the intuition of a user or a developer rather than a structured and well-defined procedure. Hence, we explore the evolution of the bug dep.ndency graph together with priority and severity levels to explore the actual triage process. Inspired by the idea of the "Wayback Machine" for the World Wide Web, we aim to reconstruct the historical decisions made in the ITS. Therefore, any bug prioritization or bug triage algorithms/scenarios can be applied in the same environment using our proposed ITS Wayback Machine. More importantly, we track the evolutionary metrics in the ITS when a custom triage/prioritization strategy is employed. We test the efficiency of the proposed algorithm using data extracted from three open-source projects. Our empirical study sheds light on the overlooked evolutionary metrics - e.g., overdue bugs and developers' loads - which are facilitated via our proposed past-event re-generator. Copyright © 2020, The Authors. All rights reserved.

关键词： computer software selection and evaluation

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Design Monitoring Electrical Power Consumtion at computer Cluster

Design Monitoring Electrical Power Consumtion at Computer Cl...

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International Symposium on Nanoscience and Nanotechnology in Life sciences 2017, ISNNLS 2017

作者： Alfianto, Enggar Agustini, Siti Muharom, Syahri Rusydi, Febdian Puspitasari, Ira Department of Computer System Institut Teknologi Adhi Tama Surabaya Jl. Arief Rachman Hakim No 100 Surabaya Indonesia Electrical Engineering Department Institut Teknologi Adhi Tama Surabaya Jl. Arief Rachman Hakim No 100 Surabaya Indonesia Theoretical Physics Research Group Dep. of Physics Fac. of Science and Technology Airlangga University Jl. Mulyorejo Surabaya60115 Indonesia Dep. of the Information System Fac. of Science and Technology Airlangga University Jl. Mulyorejo Surabaya60115 Indonesia

Electricity is one of the basic needs in the era of technological development, where all equipment must use electricity to operate such as computer, so that it requires a system that can monitor power consumption at computer cluster. To monitoring power consumption using WCS1800 to current sensor and microcontroller Atmega32 to data sensor process, and serial communication to send data to display at personal computer. From test system having two result, first is power consumption at computer cluster starting, where current value range is 0 to 38A with power consumption is 0 to 8360 watt. And second is power consumtion at computer cluster execution progran, current value is 27 to 40 A, with power consumption 5940 to 8800 watt. From this system has been design, the power consumption at computer cluster can be monitored and known value of energy consumption. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Electric power utilization

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Hamiltonian Control for CC-CV Primary-side Buck Converter of Inductive Wireless EV Charging

Hamiltonian Control for CC-CV Primary-side Buck Converter of...

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IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Thanet Sriprom Jutturit Thongpron Uthen Kamnarn Anon Namin Noureddine Takorabet Nicu Bizon Serge Pierfederici Babak Nahid-Mobarakeh Pongsiri Mungpom Burin Yodwong Phatiphat Thounthong Department of Electrical Engineering Faculty of Rajamangala University of Technology Lanna (RMUTL) Chiang Mai Thailand Groupe de Recherche en Energie Electrique de Nancy (GREEN) Universite de Lorraine Nancy France The National University of Science and Technology POLITEHNICA Bucharest Pitesti University Centre Pitesti Romania Laboratoire d'Energetique et de Mecanique Theorique et Appliquee (LEMTA) University of Lorraine Vandceuvre-Les-Nancy France Electrical and Computer Engineering McMaster University Hamilton Canada Thai French Innovation Institute King Mongkut's University of Technology North Bangkok Bangkok Thailand Dep. of Teacher Training in EE Faculty of Technical Education KMUTNB Bangkok Thailand

ISBN: (数字)9798350352290

ISBN: (纸本)9798350352306

This study presents a Hamiltonian control law for constant current - constant voltage (CC-CV) inductive wireless charging. The novel control system design, simulation, and experimentation aimed to confirm the Hamiltonian controller is a superior choice. The wireless charging experiments tested the step-resistant battery simulator and the EV battery. Based on the findings, it is possible to run the Hamiltonian control law for continuous 10A and 82 V charging while maintaining optimal response, stability, and realization. The charging system's maximum efficiency and power were 76.5% and 782 W.

关键词： Wireless communication Lithium-ion batteries PI control Buck converters Inductive charging Asia Stability analysis Electric vehicle charging Voltage control

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Feasibility study of using electronics wireless electricity detector with python software

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AIP Conference Proceedings 2024年第1期2898卷

作者： H. A. Fadhil M. N. Junita F. N. Hasoon T. A. Fadil R. A. Rahim Electrical and Computer Dep. Faculty of Eng. Sohar University Sohar-Oman Faculty of Electronics Engineering Technology Universiti Malaysia Perlis 02600 Perlis Malaysia Electrical & communication Eng. National University of Science and Technology Muscat-Oman Department of Computer Eng. Techniques Dijlah University Baghdad IRAQ

In this paper, an electronic instrument was developed that can detect electrical energy without using the conventional probes. The proposed system can detect the AC and DC voltage via wireless detector. The circuit design is based on the theory of an electronic circuit consisting of Darlington transistors that have a high gain, and a copper strip (or wire) is used as a probe. It is primarily concerned with the development of an electronic circuit for the safe handling of hazardous electrical, radiation and chemical substances. Furthermore, the proposed system offers multipurpose services such as short circuit prevention and troubleshooting as well as cable disconnection prevention. It also utilizes hazardous sensor services for any leakage voltages and currents since only DC voltages are used in the circuit design. The design is considered "green innovation" due to the fact that a DC voltage source is used rather than AC or high voltage. Intelligently designed and selection practices make efficient use of resources and minimize energy consumption by creating efficient environments. System analysis has been conducted using Python software since this language offers flexibility, and is simple to use.

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Strongly coupled plasmonic systems on optical fiber sensors: A study on nanomaterial properties 5

Strongly coupled plasmonic systems on optical fiber sensors:...

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5th International Conference on Applications of Optics and Photonics, AOP 2022

作者： Dos Santos, Paulo S. S. Mendes, João Dias, B. Pastoriza-Santos, I. De Almeida, J.M.M.M. Coelho, Luís C. C. INESC TEC - Institute for Systems and Computer Engineering Technology and Science Rua Dr. Alberto Frias Porto4200-465 Portugal FEUP University of Porto R. Dr. Roberto Frias Porto4200-465 Portugal FCUP University of Porto Rua do Campo Alegre Porto4169-007 Portugal CIQUP - Chemistry Research Unit FCUP Univ. of Porto Porto4169-007 Portugal CINBIO Univ. de Vigo Campus Univ. Lagoas Marcosende Vigo36310 Spain SERGAS-UVIGO Galicia sur Health Research Institute Vigo36312 Spain Dep. of Physics Univ. of Trás-os-Montes e Alto Douro Vila Real5001-801 Portugal

New paths to increase the sensing performance of plasmonic sensors have been reported in recent years. There are several methodologies to achieve such purpose, namely by optimizing the nanostructure, nanomaterial and even the sensing platform. Recently the use nanoparticles over plasmonic thin films have been reported and shown sensitivity enhancement, when compared to a bare thin film. Nevertheless, a nanomaterial combination between NP and thin film has not been studied. In this work it was studied such plasmonic materials in order to optimize not only refractometric sensitivity but also decrease the resultant plasmonic band width. It was found that for Au, Ag and Cu thin films, the dep.sition of plasmonic nanoparticles resulted in an overall refractometric sensitivity and figure of merit (FOM) increase. The larger FOM increase was obtained for the Ag thin film, from 42 to 162 when coupled to Si nanoparticles. The greater sensitivity increase was achieved for a Cu thin film coupled to a Si nanoparticle, with an increase from 1745 to 3230 nm/RIU. © Published under licence by IOP Publishing Ltd.

关键词： Plasmonics

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ADDRESSING MACHINES AS MODELS OF λ-CALCULUS

arXiv

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arXiv 2021年

作者： Penna, Giuseppe Della Intrigila, Benedetto Manzonetto, Giulio Dep. of Information Engineering Computer Science and Mathematics University of L’Aquila Italy Dipartimento di Ingegneria dell’Impresa University of Rome "Tor Vergata" Italy Univ. Paris 13 Sorbonne Paris Cité LIPN UMR 7030 CNRS VilletaneuseF-93430 France

Turing machines and register machines have been used for decades in theoretical computer science as abstract models of computation. Also the λ-calculus has played a central role in this domain as it allows to focus on the notion of functional computation, based on the substitution mechanism, while abstracting away from implementation details. The present article starts from the observation that the equivalence between these formalisms is based on the Church-Turing Thesis rather than an actual encoding of λ-terms into Turing (or register) machines. The reason is that these machines are not well-suited for modelling λ-calculus programs. We study a class of abstract machines that we call addressing machine since they are only able to manipulate memory addresses of other machines. The operations performed by these machines are very elementary: load an address in a register, apply a machine to another one via their addresses, and call the address of another machine. We endow addressing machines with an operational semantics based on leftmost reduction and study their behaviour. The set of addresses of these machines can be easily turned into a combinatory algebra. In order to obtain a model of the full untyped λ-calculus, we need to introduce a rule that bares similarities with the ω-rule and the rule ζβ from combinatory logic. © 2021, CC BY.

关键词： Turing machines

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Immersive Technologies in Higher Education: Applications, Challenges, and Good Practices 2019

Immersive Technologies in Higher Education: Applications, Ch...

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Proceedings of the 2019 3rd International Conference on Education and E-Learning

作者： Laura Calvet Pierre Bourdin Ferran Prados IN3-Computer Science Dep. Universitat Oberta de Catalunya Barcelona Spain and Área de empresa Universidad Internacional de Valencia Valencia Spain Computer Science Dep. Universitat Oberta de Catalunya Barcelona Spain Eventlab Edifici Teatre and Departament de Psicologia Clínica i Psicobiologia Universitat de Barcelona Barcelona Spain Computer Science Dep. Universitat Oberta de Catalunya Barcelona Spain and Medical Physics and Biomedical Engineering Department University College London London United Kingdom

ISBN: (纸本)9781450372251

Immersive technologies are becoming increasingly popular in a wide range of fields from gaming to therapy. While there is a high number of case studies in education with promising results in terms of students' performance and engagement, there has still not been widespread adoption. Indeed, more research focused on large-size samples, assessing and discussing the effects on the medium and large term is required, as well as comparisons among different hardware and software, and guidelines for instructors that want to introduce these technologies in their classrooms. In this paper, we focus on the use of immersive technologies applications in higher education. In particular, we explain the basics of immersive technologies, review the main applications in higher education, discuss benefits and challenges, and describe good practices for instructors.

关键词： Students' engagement Virtual reality Learning & ICT

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Emergency power flow re-routing in a distribution system by using dynamic line rating

Emergency power flow re-routing in a distribution system by ...

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International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

作者： Andrea Molina Gómez Gabriel Miguel Gomes Guerreiro Hannes Wiklund Johanna Lindstén Sindhu Kanya Nalini Ramakrishna Kateryna Morozovska Patrik Hilber School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm Sweden Heimdall Power AS Oslo Norway Dep. of Electromagnetic Engineering KTH Royal Institute of Technology Stockholm Sweden

ISBN: (数字)9781728128221

ISBN: (纸本)9781728128238

Dynamic rating is a technology which allows loading power lines above their rated limits. More often, dynamic rating is used to transport new power and connect additional generators to the grid using existing infrastructure. However, this study explores the possibility to use dynamic rating for improving the security of supply and assisting fast reconnection of disconnected customers during emergency and fault situations occurring at other lines. DLR allows improving power system reliability during emergency conditions using Optimal Power Flow (OPF), which additionally helps to minimize costs of system operation. Large costs involving investment for new infrastructure and penalties for interruptions in the power supply can be considerably reduced by implementing DLR. Also, DLR can improve the reliability of the system by providing real-time information on the status of power lines. Using Optimal Power Flow ensures that the lines loading, bus voltage magnitudes and angles as well as generation injections are within the acceptable limits as per the utility regulations. Faults are modelled as cases when one of the lines becomes disconnected. The bottlenecks in the system during post-fault situations are identified to determine optimal lines in the system on which DLR could be implemented.

关键词： Reliability Conductors Power system reliability Heating systems Convection Wind speed Loading

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An analysis of lockergoga ransomware

An analysis of lockergoga ransomware

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2019 IEEE East-West Design and Test Symposium, EWDTS 2019

作者： Adamov, Alexander Carlsson, Anders Surmacz, Tomasz NioGuard Security Lab Kharkiv National University of Radio Electronics Kharkiv Ukraine Dep. of Computer Science Blekinge Institute of Technology Karlskrona Sweden Institute of Computer Engineering Control and Robotics Wroclaw University of Science and Technology Wroclaw Poland

ISBN: (纸本)9781728110035

This paper contains an analysis of the LockerGoga ransomware that was used in the range of targeted cyberattacks in the first half of 2019 against Norsk Hydra-A world top 5 aluminum manufacturer, as well as the US chemical enterprises Hexion, and Momentive-Those companies are only the tip of the iceberg that reported the attack to the public. The ransomware was executed by attackers from inside a corporate network to encrypt the data on enterprise servers and, thus, taking down the information control systems. The intruders asked for a ransom to release a master key and decryption tool that can be used to decrypt the affected files. The purpose of the analysis is to find out tactics and techniques used by the LockerGoga ransomware during the cryptolocker attack as well as an encryption model to answer the question if the encrypted files can be decrypted with or without paying a ransom. The scientific novelty of the paper lies in an analysis methodology that is based on various reverse engineering techniques such as multi-process debugging and using open source code of a cryptographic library to find out a ransomware encryption model. © 2019 IEEE.

关键词： Reverse engineering

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