Risk Analysis Commons^™

Vêtements De Protection Chimique Contre Les Aérosols Solides : Performances Des Matériaux Sous Différentes Conditions D'Exposition Et Caractérisation Des Déterminants, Ludovic Tuduri, Loïc Wingert, Yves Cloutier, Stéphane Hallé, Jean Luc Giraudel, Ali Bahloul, Dominic Tessier, Patricia Dolez

Rapports de recherche scientifique

Historiquement, les mesures jugées prioritaires en hygiène industrielle ont été orientées vers la prévention de l’exposition par les voies respiratoires. Des centaines de valeurs limites d’exposition ont ainsi pu être établies à partir de méthodes d’évaluation quantitative du risque.

La part de l'exposition cutanée dans l’exposition professionnelle aux substances toxiques est pourtant significative. Le National Institute for Occupational Safety and Health (NIOSH) estime à 13 millions le nombre de travailleurs exposés à des produits chimiques par la peau avec des coûts annuels induits par le traitement des troubles cutanés évalués à un milliard de dollars. Il n’existe pas de données …

Predicting Pilot Misperception Of Runway Excursion Risk Through Machine Learning Algorithms Of Recorded Flight Data, Edwin Vincent Odisho Ii

Doctoral Dissertations and Master's Theses

The research used predictive models to determine pilot misperception of runway excursion risk associated with unstable approaches. The Federal Aviation Administration defined runway excursion as a veer-off or overrun of the runway surface. The Federal Aviation Administration also defined a stable approach as an aircraft meeting the following criteria: (a) on target approach airspeed, (b) correct attitude, (c) landing configuration, (d) nominal descent angle/rate, and (e) on a straight flight path to the runway touchdown zone. Continuing an unstable approach to landing was defined as Unstable Approach Risk Misperception in this research. A review of the literature revealed that an …

Developing A Taxonomy For Success In Commercial Pilot Behaviors, Kristine Kiernan, David S. Cross, Mark Scharf Ph.D.

Publications

Human error has been well studied in aviation. However, less is known about the ways in which human performance maintains and contributes to aviation safety. The lack of data on positive human performance prevents consideration of the full range of human behaviors when making safety and risk management decisions. The concept of resilient performance provides a framework to understand and classify positive human behaviors. Through interviews with commercial airline pilots, this study examined routine airline operations to evaluate the concept of resilient performance and to develop a taxonomy for success. The four enablers of resilient performance, anticipation, learning, responding, and …

Liability Of The Structural Engineer: Establishing, Quantifying, And Managing Risks, Justin Thomas Ittmann

LSU Doctoral Dissertations

Liability is an important topic to all practicing professionals—including practicing engineers. However, the topic of liability does not receive the necessary attention required relative to other professions. Further, engineers that desire to learn more about liability in relation to their practice do not have many university options within an engineering curriculum or from outside materials available to a non-legally trained engineer. The goal of the study is to provide a comprehensive overview of liability directed towards an intelligent practicing engineer, while avoiding unnecessary over-simplification of the material. This study initially provides an in depth survey of the legal standard of …

Systemic Analysis Of The Use Of Artificial Intelligence (Ai) In Regulating Terrorist Content On Social Media Ecosystem Using Functional Dependency Network Analysis (Fdna), Alaina Roman, C. Ariel Pinto

OUR Journal: ODU Undergraduate Research Journal

This research is a systemic analysis of emerging risks to the use Artificial Intelligence (AI) in regulating terrorist content on social media ecosystems using Functional Dependency Network Analysis (FDNA), a proven system-design-and-analysis tool). The research has three phases: 1) framing the problem by identifying and describing AI ecosystem elements as intended, implied and explicit objectives, discernible attributes, and performance indictors; 2) describing the idealized problem-solved scenario, which includes detailing ‘success’ states of the ecosystem; and 3) systemic risk analysis including identifying failure scenarios for each element and establishing causalities among elemental attributes leading to failure scenarios. This research contributes toward …

Webexpo : Vers Une Meilleure Interprétation Des Mesures D'Exposition Professionnelle Aux Substances Chimiques Sur Les Lieux De Travail, Jérôme Lavoué, Lawrence Joseph, Tracy L. Kirkham, France Labrèche, Gautier Mater, Frédéric Clerc

Rapports de recherche scientifique

Une grande partie de l'activité des hygiénistes du travail consiste à mesurer les niveaux d'exposition professionnelle des travailleurs. La plupart des rapports d'évaluation de l'exposition font état d'une importante variabilité spatiale et temporelle quant à l'intensité de l'exposition, laquelle fluctue souvent du simple au décuple en dépit de conditions apparemment similaires. Il en résulte depuis toujours un défi de taille en ce qui concerne l'interprétation des niveaux mesurés par rapport aux valeurs limites d’exposition professionnelle (VLEP). Il existe désormais un cadre consensuel – issu d'une élaboration progressive au cours des deux dernières décennies – concernant l'analyse des niveaux d’exposition par …

Webexpo: Towards A Better Interpretation Of Measurements Of Occupational Exposure To Chemicals In The Workplace, Jérôme Lavoué, Lawrence Joseph, Tracy L. Kirkham, France Labrèche, Gautier Mater, Frédéric Clerc

Rapports de recherche scientifique

Une grande partie de l'activité des hygiénistes du travail consiste à mesurer les niveaux d'exposition professionnelle des travailleurs. La plupart des rapports d'évaluation de l'exposition font état d'une importante variabilité spatiale et temporelle quant à l'intensité de l'exposition, laquelle fluctue souvent du simple au décuple en dépit de conditions apparemment similaires. Il en résulte depuis toujours un défi de taille en ce qui concerne l'interprétation des niveaux mesurés par rapport aux valeurs limites d’exposition professionnelle (VLEP). Il existe désormais un cadre consensuel – issu d'une élaboration progressive au cours des deux dernières décennies – concernant l'analyse des niveaux d’exposition par …

Defects Analysis Of Seat Belt Tensioner Cast Body, Artur Soroczński, Piotr Czyżewski, Krzysztof Rechowicz

VMASC Publications

The article presents an analysis of the implementation of a selected element of the traveler safety system used in road transport. The results of metallographic tests were presented, and the state of stress introduced to the casting by means of forming the element by means of plastic forming was analyzed. An analysis of the manufacturing process was carried out indicating the risks that may lead to cracks in the material structure. Possible causes of founding defects were pointed out and possible technological solutions were pointed out in order to avoid them.

Safety Concepts For Every Ride: A Statistical Ensemble Simulation To Mitigate Rotational Falls In Eventing Cross Country, Shannon Wood

Theses and Dissertations--Mechanical and Aerospace Engineering

Rotational falls are the leading cause of death and serious injury in the equestrian sport of eventing. Previous studies to develop safety devices used physical models representing one or at most several physical situations leading to different designs and no common understanding. In this thesis, a statistical ensemble model is developed and applied to generate and evaluate 10,000 different situations that might potentially lead to rotational falls. For accurate statistical representation of the horse and rider inertia distributions, measurements of over 400 training or competing horses and riders were recorded and incorporated. Video was recorded of 218 total competitors approaching …

Expanded Predictive Equation For Dc Arc-Flash Incident Energy In 125v Battery Systems, Austin Gaunce

Theses and Dissertations--Electrical and Computer Engineering

Arc-flash is a dangerous phenomenon that can occur during an arcing fault in an electrical system. People nearby may be subjected to extreme heat, light, pressure, and sound. Research regarding arc-flash has focused primarily on AC arc-flash due to the prevalence of AC electricity in the grid. However, the grid has begun to integrate more DC electrical sources as a result of decentralization efforts and environmental concerns. The increased proliferation of DC electrical sources demands research into DC arc-flash to assess the hazard as low-voltage DC sources have already become commonplace. Some DC arc-flash models have been produced to estimate …

Heterogeneous Uncertainty Quantification For Reliability-Based Design Optimization, Mingyang Li

Dissertations, Master's Theses and Master's Reports

Uncertainty is inherent to real-world engineering systems, and reliability analysis aims at quantitatively measuring the probability that engineering systems successfully perform the intended functionalities under various sources of uncertainties. In this dissertation, heterogeneous uncertainties including input variation, data uncertainty, simulation model uncertainty, and time-dependent uncertainty have been taken into account in reliability analysis and reliability-based design optimization (RBDO). The input variation inherently exists in practical engineering system and can be characterized by statistical modeling methods. Data uncertainty occurs when surrogate models are constructed to replace the simulations or experiments based on a set of training data, while simulation model uncertainty …

Analysis Of Factors Influencing The Stationarity Of Surface Electromyography Signals Measured In Non-Fatigued Shoulder Muscles, Hui Ci

Graduate Theses, Dissertations, and Problem Reports (ETD)

A reduction in the % stationarity of surface electromyography (SEMG) signals with respect to the initial or fresh condition is used to predict localized muscle fatigue. However, factors other than muscle fatigue can also influence the stationarity of SEMG signals. This study was aimed at analyzing the effect of various work/task related factors on the stationarity of SEMG signals obtained from non-fatigued shoulder muscles. Twelve participants were recruited for data collection and each one performed 120 trials characterized by the combination of 2 shoulder angles (60° and 120°), 2 planes of exertions (sagittal and scapular), 3 force levels (0lb, 2.5lb, …

Internet Of Things For Sustainability: Perspectives In Privacy, Cybersecurity, And Future Trends, Abdul Salam

Computer Information Technology Faculty Publications

In the sustainability IoT, the cybersecurity risks to things, sensors, and monitoring systems are distinct from the conventional networking systems in many aspects. The interaction of sustainability IoT with the physical world phenomena (e.g., weather, climate, water, and oceans) is mostly not found in the modern information technology systems. Accordingly, actuation, the ability of these devices to make changes in real world based on sensing and monitoring, requires special consideration in terms of privacy and security. Moreover, the energy efficiency, safety, power, performance requirements of these device distinguish them from conventional computers systems. In this chapter, the cybersecurity approaches towards …

Implications Of Variability Of Electromyographic Measurements For Assessing Localized Muscle Fatigue, Hamad Nasser Alasim

Graduate Theses, Dissertations, and Problem Reports (ETD)

The impact of work-related musculoskeletal disorders (WMSDs) is enormous due to a combination of direct and indirect costs associated with healthcare, lost workdays and human suffering. Because of the established relationship between Localized Muscle Fatigue (LMF) development and WMSDs, and in order to reduce and/or prevent WMSDs in workplaces, different fatigue assessment methods have been developed. Surface Electromyography (SEMG) is a commonly used LMF assessment technique. The SEMG signals are typically analyzed in time and frequency domains to predict LMF based on a relative change with respect to initial, or under no-fatigue conditions. Quantifying such change, however, relies on the …

Assessment Of Unmanned Aerial Systems And Lidar For The Utility Vegetation Management Of Electrical Distribution Rights-Of-Ways, Matthew R. Walker

Graduate Theses, Dissertations, and Problem Reports (ETD)

Utility Vegetation Management (UVM) is often the largest maintenance expense for many utilities. However, with advances in Unmanned Aerial Systems (UAS; or more commonly, “drones”) and lidar technologies, vegetation managers may be able to more rapidly and accurately identify vegetation threats to critical infrastructures. The goal of this study was to assess the utility of Geodetics’ UAS-lidar system for vegetation threat assessment for 1.6 km of a distribution electric circuit. We investigated factors which contribute to accurate tree crown detection and segmentation of trees from within an UAS-lidar derived point cloud, and the factors which contribute to accurate tree risk …

Microplastics In Industrial Wastewater Treatment Plant: Quantification, Identification And Ecological Risk Assessment, Sujarat Saiwaree

Chulalongkorn University Theses and Dissertations (Chula ETD)

Wastewater treatment plants (WWTPs) are one of the significant pathways of microplastics (MPs) entering the environment. Thus, information regarding this issue is still requisite in Thailand. In this study, wastewater and sludge samples were collected from various treatment units of industrial WWTP in dry season (February 2020) and wet season (July 2020). The MP particles were identified by size, shape, and polymer types. From the wastewater, MPs were detected in the highest amounts after the aeration unit (134.35 ± 20.79 particles/L) in dry season sample. In addition, sludge contained relatively low MPs. The size fraction in wastewater varied, but in …

การประเมินความเสี่ยงต่อสุขภาพจากการรับสัมผัส Pm10 Pm2.5 และสารประกอบอินทรีย์ระเหยง่ายในโรงพิมพ์, นพรัตน์ พงศ์บุญคุ้มลาภ

Chulalongkorn University Theses and Dissertations (Chula ETD)

ความสัมพันธ์ระหว่างกระบวนการพิมพ์และการได้รับสัมผัสมลพิษอากาศของผู้ปฏิบัติงานได้มีการติดตามตรวจสอบในช่วงระยะเวลา 5 วันทำงานติดต่อกัน เป็นระยะเวลา 8 ชั่วโมงต่อวัน โดยได้ทำการตรวจวัดปริมาณความเข้มข้นในการได้รับสัมผัส TVOC และ PM2.5 ในกระบวนการพิมพ์จากโรงพิมพ์อาสาสมัครในประเทศไทยจำนวน 5 แห่ง ในการศึกษาครั้งนี้ ได้ทำการเปรียบเทียบระหว่างระบบการพิมพ์ออฟเซตและระบบการพิมพ์ดิจิตอล พบว่าค่าเฉลี่ย 8 ชั่วโมงของ PM2.5 ในจุดอ้างอิง, จุดออฟเซต A, จุดออฟเซต B, จุดออฟเซต C, จุดดิจิตอล D, และจุดออฟเซต E มีค่าเท่ากับ 7.46 ± 0.89, 21.51 ± 1.74, 44.26 ± 11.11, 77.92 ± 11.85, 42.08 ± 7.81 และ 28.21 ± 8.80 มคก/ลบม. ตามลำดับ ค่าเฉลี่ยของ PM2.5 ในจุดออฟเซต C มีค่าสูงสุดเท่ากับ 77.92 มคก/ลบม. เกิดจากมีปริมาณฝุ่นกระดาษเป็นจำนวนมากในบริเวณที่ตรวจวัด ค่าเฉลี่ย 8 ชั่วโมงของ TVOC ในจุดอ้างอิง, จุดออฟเซต A, จุดออฟเซต B, จุดออฟเซต C, จุดดิจิตอล D, และจุดออฟเซต E มีค่าเท่ากับ 0.12 ± 0.04, 2.68 ± 0.89, 5.02 ± 3.02, 21.86 ± 6.82 0.68 ± 0.08, และ 0.52 ± 0.19 ส่วนในล้านส่วน ค่าเฉลี่ยของ TVOC ในจุดออฟเซต C …

Health Risk Assessment Of Particulate Matter Associated With Polychlorinated Biphenyls And Polycyclic Aromatic Hydrocarbons In Bangkok And Chiang Mai, Thailand, Nareerat Punvitayakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Atmospheric pollutants have become a severe problem in creating health issues in Thailand. Due to the increase in fine particles in the air environment, the city population is facing acute respiratory problems. For understanding the concentration of polycyclic aromatic hydrocarbon (PAHs) and Polychlorinated biphenyls (PCBs), 24 samplings were done in Chiangmai and Bangkok of Thailand using Polyurethane (PUF) disk passive samplers. There were five sampling sites in Bangkok, and three in Chiang Mai. Data were collected in the dry season from December 2018- June 2019. A total of 24 samples were extracted and further quantitatively analyzed by the standard method …

Analysis Of Runway Incursion Trends: Implications For Cost-Benefit Analysis Of Mitigation Investments, David C. Ison

International Journal of Aviation, Aeronautics, and Aerospace

This causal-comparative and correlation study investigated the costs of runway incursion safety improvements in relation to their effectiveness to assess potential aviation system benefits.Two airports (Los Angeles International and Dallas-Ft. Worth International), which were early adopters of Runway Status Lights (RWSL), a runway incursion technology, were targeted in this analysis. Findings indicated that there were no significant differences in counts or rates of Category A, B, and D incursions at LAX and DFW when comparing the time periods before versus after RWSL installation. Category C counts and rates were found to have increased significantly after RWSL installation. The findings of …

The Impact Of Human Assurance On Satellite Operations, Holly Handley, Dan Heimerdinger, Unal Tatar (Ed.), Adrian V. Gheorghe (Ed.), Omer F. Keskin (Ed.), Jean Muylaert (Ed.)

Engineering Management & Systems Engineering Faculty Publications

Mission assurance is a method to guarantee mission success against a known set of risks; mission assurance is generally represented as a probability against a threshold of acceptable performance. Human assurance can be considered as the likelihood of acceptable operator performance given a set of conditions that include the operator, the system, and the environment. Standard mission assurance models tend to assume a qualified crew, but do not include other aspects of the internal or external environment that may impact the reliability of the human operator. A human assurance model can be created that allows the exploration of the variability …