157 results on '"Demichela, Micaela"'
Search Results
152. Risk analysis as a basis for safety management system
- Author
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Demichela, Micaela, primary, Piccinini, Norberto, additional, and Romano, Alfredo, additional
- Published
- 2004
- Full Text
- View/download PDF
153. Human Factor Analysis Embedded in Risk Assessment of Industrial Machines: Effects on the Safety Integrity Level.
- Author
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DEMICHELA, MICAELA, PIRANI, ROBERTA, and LEVA, MARIA CHIARA
- Subjects
RISK assessment ,DECISION making ,TASK analysis ,COMPLEXITY (Philosophy) ,PROBABILITY theory - Abstract
The study consists in devising a method to account qualitatively and quantitatively for the human factor in verifying the Safety Integrity Level (SIL) assigned to machinery. Two crucial aspects have to be taken into account modelling man-machine interaction in Quantitative Risk Analysis (QRA): 1. The need to include the human interaction in the logical model of QRAs techniques; 2. The quantification of the effect of human factors. The efforts were thus aimed at defining an improved methodological framework encompassing the integration of Human and Organisational Factors (H&OF) into safety analysis by means of quantitative risk assessment schemes. In the end, the Integrated Dynamic Decision Analysis (IDDA) was adopted, integrated to Task Analysis. This tool allows modelling the logic of a complex system; it provides a representation of all the possible alternative states into which the system could evolve as a real logical and temporal sequence of events. The proposed model is designed with the aim of transferring the IDDA philosophy to the in-depth study of the deviations that may occur during human implementation of operational procedures and to analyse their effects on system reliability. [ABSTRACT FROM AUTHOR]
- Published
- 2014
154. Exploring the Influence of Human System Interfaces: Introducing Support Tools and an Experimental Study.
- Author
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Amazu, Chidera W., Mietkiewicz, Joseph, Abbas, Ammar N., Briwa, Houda, Alonso-Perez, Andres, Baldissone, Gabriele, Fissore, Davide, Demichela, Micaela, and Leva, Maria Chiara
- Subjects
- *
ALARMS , *CONTROL rooms , *ARTIFICIAL intelligence , *BAYESIAN analysis , *COGNITIVE ability , *REINFORCEMENT learning , *SITUATIONAL awareness - Abstract
AbstractSituational awareness and decision support tools such as procedures and alarm systems are vital for effective interaction among control room operators, especially in safety-critical situations. In safety-critical environments such as process plants, there remains a gap in evaluating specific tools during actual operations, or ”work-as-done.” Additionally, the underlying factors that might impact operators’ cognitive states and performance concerning safety have not been thoroughly explored. The need for such an evaluation is further bolstered by current interaction configurations where operators are more passive than active, thus reducing their cognitive performance. Therefore, this experimental study addresses the highlighted evaluation gap by introducing and comparing three human system interfaces/decision support tools in four human-in-the-loop configurations. The supports include two alarm design formats (prioritized vs. non-prioritized) and three procedure representation formats (paper, screen-based digitized, and an AI-based support system built with an integrated Bayesian network and reinforcement learning model). Ninety-two people (n = 92) participated voluntarily in the test. They were divided equally into four groups. Each group tested three safety-related events in a simulated formaldehyde production facility. Individuals belonging to the group with prioritized alarms and utilized paper procedures rated procedural support slightly higher on average than others in different groups. Unlike the other groups, their assessment of alarm prioritization support remained consistent across all scenarios. Further analysis of the impact of the setup on cognitive states and actual performance will be performed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
155. Razvoj i implementacija naprednog metoda za unapređenje bezbednosti i optimizaciju radnog okruženja pri manuelnim operacijama
- Author
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Giagloglou, Evanthia, Mačužić, Ivan, Demichela, Micaela, Bamidis, Panagiotis, Milisavljević, Stevan, and Todorović, Petar
- Abstract
REZIME Savremeni industrijski sistemi se mogu opisati pomoću napredne tehnologije i opreme koju koriste, i često se pogrešno smatra da je ljudski uticaj u takvim sistemima u potpunosti eliminisan. Međutim, čovek je i dalje ključna komponenta za funkcionisanje sistema, obzirom da automatizovane linije nisu eliminisale manuelne operacije. Bez obzira na visok nivo tehnološkog napretka, bezbednost na radu se ne može u potpunosti zagarantovati. Shodno tome, bezbednost i zdravlje na radu ostaje ključna oblast za unapređenje u svakom radnom okruženju. Ergonomija je oblast nauke koji se bavi optimizacijom radnih aktivnosti i ima za cilj smanjivanje broja oboljenja u vezi sa radom. Većina tehnika i metoda za identifikaciju zdravstvenih problema u vezi sa radom i optimizacije radnog okruženja se zasniva na praćenju sprovođenja radnih aktivnosti i izveštavanju o incidentima/akcidentima. Dok, metode za izbegavanje ljudskih grešaka se zasnivaju na obukama i odgovarajućem obrazovanju iz oblasti bezbednosti i zdravlja na radu. Praćenje sprovođenja radnih aktivnosti je subjektivna metoda, a izveštavanje o incidentima/akcidentima može biti veoma značajan parametar za razumevanje problema na radnom mestu. Ipak, činjenice i rezultati ovim metodama se ne dobijaju u realnom vremenu što može predstavljati značajno i važno pitanje za bezbednost na radnom mestu. Sa druge strane, metode za obuku iz bezbednosti i zdravlja na radu, iako je skoro sve vreme neophodna, ne sprečava u potpunosti nastanak incidenata/akcidenata i oboljenja na radnom mestu, što ukazuje na veliki prostor za unapređenje u ovoj oblasti. Ova doktorska disertacija istražuje mogućnosti primene elektrofizioloških merenja kako bi se zabeležilo kognitivno stanje radnika paralelno primenjivajući postojeće standardizovane metode u oblasti ergonomije. Fokus ove doktorske disertacije jeste na upotrebljivosti elektordermalne aktivnosti tokom sprovođenja tri tipa istraživanja i to: dva su vezana za sprovođenje ponavljajućih radnih aktivnosti i treći se odnosi na obuku iz oblasti bezbednosti i zdravlja na radu. ABSTRACT Modern industrial environment can be described by advanced technology and machinery and many believe that human operational tasks are almost eliminated. However, people are still the key component of the processes whilst automation has not eliminated manual operations. Safety in the working place cannot be guaranteed, despite technological advances; accordingly, Occupational Health and Safety remains a crucial sector for improvement in every working environment. Ergonomics deal with the optimization of work design and aims to minimize occupational issues. Most of the techniques for the identification of occupational issues and optimization of working environment are based on task observation and recording incidents. While methods for avoidance of human error are based on training and appropriate safety education. Task observation is a subjective method, and recording of incidents can be an important kind of metrics for understanding the workplace defects. Nevertheless, these methods do not capture the facts in real time and this can be an important issue for the workplace safety. On the other hand, methods of safety training, although are most of the times necessary, do not really prevent from accidents or occupational health problems and still remain an open sector of improvement. This thesis investigates the possibility of electrophysiological recording for the purpose to capture operators’ cognition in parallel with application of ergonomic standardized methods. The study focuses on the usefulness of Electrodermal activity during three case−studies; two of them represent common working tasks of low risk, and one is based on safety training methods. Electrodermal activity has demonstrated to relate discomfort and cognitive status to specific biosignals, therefore, it can be a valid tool for deeply understanding the status of the operators, while they perform cognitive or physical tasks. The core of Electrodermal activity usefulness is that it is a mechanism of sympathetic nervous system and can be used as an index of autonomic reaction to emotions.
- Published
- 2018
156. Non-symetries in baseline PSA models
- Author
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Vrbanić, Ivan, Mikuličić, Vladimir, Šimić, Zdenko, Zio, Enrico, Demichela, Micaela, and Piccinini, Norberto
- Subjects
non-symetries ,probabilistic safety assessment ,fault tree - Abstract
[poslije]
- Published
- 2001
157. RISK MONITOR BASED ON 'RISK SPECTRUM PSA PROFESSIONAL'
- Author
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Šimić, Zdenko, Mikuličić, Vladimir, Vrbanić, Ivan, Zio, Enrico, Demichela, Micaela, and Piccinini, Norberto
- Subjects
risk monitor ,probabilistic safety assessment - Abstract
This paper is describing principles and first practical results of Probabilistic Safety Assessment Risk Monitoring tool. It is known that PSA needs very sophisticated software tool for development and usage. That same tool usually is missing module for novel RM functionalities. It is usually very hard to convert existing PSA model from one format to another. Problems are related to model completes and connectivity. For that reason having RM tool which is using same PSA software already used for base model is greater advantage. There is no known RM tool directly based on RiskSpectrum PSA Professional software. In this paper basic concept is outlined for RM tool which is using original PSA model in RiskSpectrum format, and respected solving/quantification engine Risk Spectrum Analysis Tool. Beside that first results are also presented.
- Published
- 2001
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