| 1. |
- Alseekh, Saleh, et al.
(författare)
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Mass spectrometry-based metabolomics: a guide for annotation, quantification and best reporting practices
- 2021
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Ingår i: Nature Methods. - : Springer Science and Business Media LLC. - 1548-7091 .- 1548-7105. ; 18:7, s. 747-756
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Forskningsöversikt (refereegranskat)abstract
- This Perspective, from a large group of metabolomics experts, provides best practices and simplified reporting guidelines for practitioners of liquid chromatography- and gas chromatography-mass spectrometry-based metabolomics. Mass spectrometry-based metabolomics approaches can enable detection and quantification of many thousands of metabolite features simultaneously. However, compound identification and reliable quantification are greatly complicated owing to the chemical complexity and dynamic range of the metabolome. Simultaneous quantification of many metabolites within complex mixtures can additionally be complicated by ion suppression, fragmentation and the presence of isomers. Here we present guidelines covering sample preparation, replication and randomization, quantification, recovery and recombination, ion suppression and peak misidentification, as a means to enable high-quality reporting of liquid chromatography- and gas chromatography-mass spectrometry-based metabolomics-derived data.
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| 2. |
- Blauhut, Veit, et al.
(författare)
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Lessons from the 2018-2019 European droughts : a collective need for unifying drought risk management
- 2022
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Ingår i: Natural hazards and earth system sciences. - : Copernicus Publications. - 1561-8633 .- 1684-9981. ; 22:6, s. 2201-2217
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Tidskriftsartikel (refereegranskat)abstract
- Drought events and their impacts vary spatially and temporally due to diverse pedo-climatic and hydrologic conditions, as well as variations in exposure and vulnerability, such as demographics and response actions. While hazard severity and frequency of past drought events have been studied in detail, little is known about the effect of drought management strategies on the actual impacts and how the hazard is perceived by relevant stakeholders. In a continental study, we characterised and assessed the impacts and the perceptions of two recent drought events (2018 and 2019) in Europe and examined the relationship between management strategies and drought perception, hazard, and impact. The study was based on a pan-European survey involving national representatives from 28 countries and relevant stakeholders responding to a standard questionnaire. The survey focused on collecting information on stakeholders' perceptions of drought, impacts on water resources and beyond, water availability, and current drought management strategies on national and regional scales. The survey results were compared with the actual drought hazard information registered by the European Drought Observatory (EDO) for 2018 and 2019. The results highlighted high diversity in drought perception across different countries and in values of the implemented drought management strategies to alleviate impacts by increasing national and sub-national awareness and resilience. The study identifies an urgent need to further reduce drought impacts by constructing and implementing a European macro-level drought governance approach, such as a directive, which would strengthen national drought management and mitigate damage to human and natural assets.
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| 3. |
- Blauhut, Veit, et al.
(författare)
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Lessons from the 2018–2019 European droughts: A collective need for unifying drought risk management
- 2021
-
Ingår i: Natural hazards and earth system sciences. - : Copernicus Publications. - 1561-8633 .- 1684-9981.
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Drought events and their impacts vary spatially and temporally due to diverse pedo-climatic and hydrologic conditions, as well as variations in exposure and vulnerability, such as demographics and response actions. While hazardous severity and frequency of past drought events have been studied in detail, little is known about the effect of drought management strategies on the actual impacts, and how the hazard is perceived by relevant stakeholders for inducing action. In a continental study, we characterised and assessed the impacts and the perceptions of two recent drought events (2018 and 2019) in Europe and examined the relationship between management strategies and drought perception, hazard and impacts. The study was based on a pan-European survey involving national representatives from 28 countries and relevant stakeholders responding to a standard questionnaire. The survey focused on collecting information on stakeholders’ perceptions of drought, impacts on water resources and beyond, water availability and current drought management strategies at national and regional scales. The survey results were compared with the actual drought hazard information registered by the European Drought Observatory (EDO) for 2018 and 2019. The results highlighted high diversity in drought perceptions across different countries and in values of implemented drought management strategies to alleviate impacts by increasing national and sub-national awareness and resilience. The study concludes with an urgent need to further reduce drought impacts by constructing and implementing a European macro-level drought governance approach, such as a directive, which would strengthen national drought management and lessen harm to human and natural potentials.
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| 4. |
- Ek, Åsa, et al.
(författare)
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Safety Leadership in Two Types of Safety-Critical Systems
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association, IEA 2021 - Systems and Macroergonomics. - Cham : Springer International Publishing. - 2367-3389 .- 2367-3370. - 9783030746025 - 9783030746018 ; 219 LNNS, s. 655-663
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Konferensbidrag (refereegranskat)abstract
- In safety-critical systems, such as aviation systems, nuclear power plants and hospitals, system failures can cause loss of life, environmental and property damage. Safety-critical systems consists of loose or tight interactions, they are more or less complex, and these characteristics affect the system’s ability to prevent and overcome emerging system failures. The demand for good safety cultures, and safe and efficient work within these types of systems highlight the crucial role of safety leadership. This paper reports on findings from a small pilot study with the aim of exploring whether safety leadership in practice differs according to the built in properties of complexity and coupling in safety-critical organizations. Based on a literature review on safety leadership, interviews were conducted with one leader at a nuclear power plant, and one at a university hospital. The two systems can be viewed to have separate characters and differences in the way work is performed. Contrasts existed between safety leadership within the nuclear power plant and the hospital setting concerning flexibility in the organizations. The hospital setting were more suitable for adaptability and flexibility in relation to dynamical decision hierarchies. The nuclear power plant setting was viewed as more rigid with tightly coupled interactions, and the leadership and safety culture might be extra crucial within this system. Nevertheless, both interviewees promoted a transformational and inspirational leadership style. However, transactional leadership was preferable in critical situations.
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| 5. |
- Emerson, Joanne B., et al.
(författare)
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Diverse sediment microbiota shape methane emission temperature sensitivity in Arctic lakes
- 2021
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 12
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Tidskriftsartikel (refereegranskat)abstract
- Northern post-glacial lakes are significant, increasing sources of atmospheric carbon through ebullition (bubbling) of microbially-produced methane (CH4) from sediments. Ebullitive CH4 flux correlates strongly with temperature, reflecting that solar radiation drives emissions. However, here we show that the slope of the temperature-CH4 flux relationship differs spatially across two post-glacial lakes in Sweden. We compared these CH4 emission patterns with sediment microbial (metagenomic and amplicon), isotopic, and geochemical data. The temperature-associated increase in CH4 emissions was greater in lake middles—where methanogens were more abundant—than edges, and sediment communities were distinct between edges and middles. Microbial abundances, including those of CH4-cycling microorganisms and syntrophs, were predictive of porewater CH4 concentrations. Results suggest that deeper lake regions, which currently emit less CH4 than shallower edges, could add substantially to CH4 emissions in a warmer Arctic and that CH4 emission predictions may be improved by accounting for spatial variations in sediment microbiota.
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| 6. |
- Gleißner, Robert, et al.
(författare)
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Role of Oxidation–Reduction Dynamics in the Application of Cu/ZnO-Based Catalysts
- 2023
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Ingår i: ACS Applied Nano Materials. - 2574-0970. ; 6:9, s. 8004-8016
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Tidskriftsartikel (refereegranskat)abstract
- We investigated Cu nanoparticles (NPs) on vicinal and basal ZnO supports to obtain an atomistic picture of the catalyst’s structure under in situ oxidizing and reducing conditions. The Cu/ZnO model catalysts were investigated at elevated gas pressures by high energy grazing incidence X-ray diffraction and ambient pressure X-ray photoelectron spectroscopy (AP-XPS). We find that the Cu nanoparticles are fully oxidized to Cu2O under atmospheric conditions at room temperature. As the nanoparticles swell during oxidation, they maintain their epitaxy on basal ZnO (000 ± 1) surfaces, whereas on the vicinal ZnO (101̅4) surface, the nanoparticles undergo a coherent tilt. We find that the oxidation process is fully reversible under H2 flow at 500 K, resulting in predominantly well-aligned nanoparticles on the basal surfaces, whereas the orientation of Cu NPs on vicinal ZnO was only partially restored. The analysis of the substrate crystal truncation rods evidences the stability of basal ZnO surfaces under all gas conditions. No Cu–Zn bulk alloy formation is observed. Under CO2 flow, no diffraction signal from the nanoparticles is detected, pointing to their completely disordered state. The AP-XPS results are in line with the formation of CuO. Scanning electron microscopy images show that massive mass transport has set in, leading to the formation of larger agglomerates.
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| 7. |
- Grosse, Eric H., et al.
(författare)
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Human-centric production and logistics system design and management: transitioning from Industry 4.0 to Industry 5.0
- 2023
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Ingår i: International Journal of Production Research. - 0020-7543 .- 1366-588X. ; 61:22, s. 7749-7759
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Industry 4.0 was presented more than a decade ago as the fourth industrial revolution, aiming to significantly raise the level of sophistication of interconnected technologies and thus increase manufacturing industries’ profits. However, because the technology-driven narrow focus of Industry 4.0 on performance and profit fails to explain how to increase prosperity for all the stakeholders involved, the European Commission has introduced the concept of Industry 5.0. This vision overcomes the weaknesses of Industry 4.0 by paying explicit attention to outcomes for humans in the system and establishing an environment to create human-centric, resilient, and sustainable systems. Considering these developments, this position paper and editorial introducing the special issue of the International Journal of Production Research elaborates on the transition from Industry 4.0 to 5.0 through 10 papers focusing on the human-centric pillar of Industry 5.0 and its impacts on production and logistics system design and management. This work presents guidance for a more systemic approach needed in future research: to include empirically grounded works and data-driven multimethod approaches that consider diversity in system operators and human factors demands holistically in order to incorporate ethical implications missing from Industry 4.0–in the pursuit of Industry 5.0 systems.
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| 8. |
- Hemphälä, Hillevi, et al.
(författare)
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Visual Symptoms and Risk Assessment Using Visual Ergonomics Risk Assessment Method (VERAM)
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021) - Volume II : Inclusive Design - Inclusive Design. - Cham : Springer International Publishing. - 2367-3389 .- 2367-3370. - 9783030746049 ; 220, s. 729-735, s. 729-735
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Konferensbidrag (refereegranskat)abstract
- A visual environment impaired by e.g. glare can cause eyestrain, visual symptoms and musculoskeletal strain. A Visual Ergonomics Risk Assessment Method (VERAM) consisting of both a subjective questionnaire and an objective risk assessment, have been used at 217 workplaces, mainly computer work. VERAM can be used to examine and prevent deficiencies and increase wellbeing as well as detecting risks in the visual work environment and suggest measures that can be used to reduce the risks. The questionnaire showed that eyestrain, visual symptoms and musculoskeletal strain are common among Swedish workers. The overall risk assessments for glare and amount of illuminance on work surface are divided into three categories, green – no risk, yellow – risk, and red – high risk. Risk of glare and insufficient illuminance was present at 66% and 49% of the assessed workplaces, respectively. When the risk of glare and illuminance levels was rated as red, the frequency of the subjective strain was higher.
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| 9. |
- Mendoza-Collazos, Juan Carlos, et al.
(författare)
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Responsibility of Action and Situated Cognition in Artefact—User Relationship
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021) : Volume 1: Systems and Macroergonomics - Volume 1: Systems and Macroergonomics. - Cham : Springer International Publishing. - 2367-3389 .- 2367-3370. - 9783030746025 - 9783030746018 ; 219, s. 211-216
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Konferensbidrag (refereegranskat)abstract
- I discuss the dilution of responsibility of action and the idea of a symmetrical relationship between artefacts and humans. In doing so, I argue that meaning making is an activity unilaterally performed by agents, leading to an asymmetrical relationship between agents and artefacts. Therefore, the study of the one who is responsible for the action, the meaning-maker (with the capability to act) is crucial for a theory of action responsibility. The latter should not be transferred to derived agents, an abstract brand or impersonal technologies. The study of the origin of actions is crucial for a better understanding of situated cognition in relation to responsibility. Therefore, the role of artefacts in human actions has to be reconsidered, since artefacts acquire functions by means of designing and they do not act for themselves. These issues have consequences for our understanding of situated cognition and for the current debate on responsibility of AI technologies, as well as for work analysis and design.
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| 10. |
- Neumann, W. Patrick, et al.
(författare)
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A comparison of work-rest models using a "breakpoint" analysis raises questions
- 2020
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Ingår i: IISE TRANSACTIONS ON OCCUPATIONAL ERGONOMICS & HUMAN FACTORS. - : Informa UK Limited. - 2472-5838 .- 2472-5846. ; 8:4, s. 187-194
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Tidskriftsartikel (refereegranskat)abstract
- OCCUPATIONAL APPLICATIONS Designing sustainable cyclic work requires attention to both the workload amplitude as well as the duty cycle, the fraction of the work cycle with active workload, that therefore also defines the recovery phase of the cycle. A number of different approaches and models have been developed to calculate the required recovery time for a given load and duty cycle. We present a comparison of three types of models at the "breakpoint" that defines the boundary of load amplitude and duty cycle where fatigue begins to accumulate faster than recovery allows within the work cycle. This comparison shows considerable variation between models of the "allowable" load or duty cycle depending on the method used. Practitioners should thus be cautious applying these models indiscriminately in job design as their results can vary substantially. In particular, differences between the tasks used for model formulation and application may compromise validity, and model application in a given context should be verified before broad application. TECHNICAL ABSTRACT Rationale: There is a need for tools to help design sustainable work in which muscular capacity and other human resources can recover at least as quickly as they are used. Purpose: In this brief report, three different approaches presented in the literature to determining work-rest schedules in cyclic work are compared. Methods: First, a set of five different muscular endurance models coupled with a recovery time model were considered, both with and without a dynamic work correction factor. Second, we examined a model of "resumption time", and third a psychophysically-based model of maximum duty cycle was included. These models were compared using the concept of a "breakpoint" in fatigue accumulation-the point at which a given load amplitude and duty cycle combination begins to cause accumulation of fatigue in each cycle and from which there is inadequate time to recover. Results: While the five endurance time models all behaved similarly, both with and without the static-to-dynamic correction factor applied, the three different types of modeling approaches provided substantially different response patterns. The psychophysically based model provided the most protective guideline among the models compared. Conclusion: These models should be applied with caution to particular work scenarios. Further research is needed to test accuracy and effectiveness when applying such models to a range of task scenarios to establish safe workloads and loading times in the design of repetitive work.
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| 11. |
- Nguyen, Thanh N, et al.
(författare)
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Global Impact of the COVID-19 Pandemic on Stroke Volumes and Cerebrovascular Events: A 1-Year Follow-up.
- 2023
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Ingår i: Neurology. - 1526-632X. ; 100:4
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Tidskriftsartikel (refereegranskat)abstract
- Declines in stroke admission, IV thrombolysis (IVT), and mechanical thrombectomy volumes were reported during the first wave of the COVID-19 pandemic. There is a paucity of data on the longer-term effect of the pandemic on stroke volumes over the course of a year and through the second wave of the pandemic. We sought to measure the effect of the COVID-19 pandemic on the volumes of stroke admissions, intracranial hemorrhage (ICH), IVT, and mechanical thrombectomy over a 1-year period at the onset of the pandemic (March 1, 2020, to February 28, 2021) compared with the immediately preceding year (March 1, 2019, to February 29, 2020).We conducted a longitudinal retrospective study across 6 continents, 56 countries, and 275 stroke centers. We collected volume data for COVID-19 admissions and 4 stroke metrics: ischemic stroke admissions, ICH admissions, IVT treatments, and mechanical thrombectomy procedures. Diagnoses were identified by their ICD-10 codes or classifications in stroke databases.There were 148,895 stroke admissions in the 1 year immediately before compared with 138,453 admissions during the 1-year pandemic, representing a 7% decline (95% CI [95% CI 7.1-6.9]; p < 0.0001). ICH volumes declined from 29,585 to 28,156 (4.8% [5.1-4.6]; p < 0.0001) and IVT volume from 24,584 to 23,077 (6.1% [6.4-5.8]; p < 0.0001). Larger declines were observed at high-volume compared with low-volume centers (all p < 0.0001). There was no significant change in mechanical thrombectomy volumes (0.7% [0.6-0.9]; p = 0.49). Stroke was diagnosed in 1.3% [1.31-1.38] of 406,792 COVID-19 hospitalizations. SARS-CoV-2 infection was present in 2.9% ([2.82-2.97], 5,656/195,539) of all stroke hospitalizations.There was a global decline and shift to lower-volume centers of stroke admission volumes, ICH volumes, and IVT volumes during the 1st year of the COVID-19 pandemic compared with the prior year. Mechanical thrombectomy volumes were preserved. These results suggest preservation in the stroke care of higher severity of disease through the first pandemic year.This study is registered under NCT04934020.
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| 12. |
- Nilsson, Kerstin, et al.
(författare)
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Are My Employees Able to and Do They Want to Work? : The Baseline Investigation in a Follow up Study Regarding Managers’ Attitudes and Measures to Increase Employees’ Employability in an Extended Working Life
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021) : Volume II: Inclusive Design - Volume II: Inclusive Design. - Cham : Springer International Publishing. - 2367-3370 .- 2367-3389. - 9783030746049 - 9783030746056 ; 220, s. 10-16
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Konferensbidrag (refereegranskat)abstract
- Background: The demographic change affects the retirement age, which has been postponed in many countries. Therefore, the number of senior employees is increasing in the world. However, managers’ attitudes towards their employees’ employability affect the employees’ possibilities regarding whether they can and want to work. Objective: The aim of this study was to evaluate managers’ attitudes towards their employees’ employability and what factors and measures that affect whether employees can and want to work in an extended working life. Method: The study population in this study consists of 249 municipality managers in Sweden, from a baseline investigation in a follow up study following the swAge-questionnaire. The data was analysed through the method of logistic regression. Results: 79% of the managers stated that their employees ‘can’ work and 58% that their employees ‘want to’ work until 65 years or older. Managers believed their employees’ health, physical work environment, skills and competence were associated to if they would be able to work until 65 years or older. Lack of support in the social work environment and lack of possibilities to arrange relocations if needed were associated to whether managers believed their employees want to work. Conclusions: The results indicate that the postponement the retirement age must be followed by measures in the employees’ work situation in order to decrease demands, increase rotation or change work tasks if needed, as well as increased possibilities to recuperate through reduced workload, reduced work pace and reduced working hours. The results will hopefully contribute to the understanding of needed organisational measures in the process of extending working life.
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| 13. |
- Nilsson, Kerstin, et al.
(författare)
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Management, Measures and Maintenance: : Success and Setbacks in Interventions Promoting a Healthy and Sustainable Employability and Working Life for All Ages
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021) : Volume II: Inclusive Design - Volume II: Inclusive Design. - Cham : Springer International Publishing. - 2367-3370 .- 2367-3389. - 9783030746049 - 9783030746056 ; 220, s. 17-24, s. 17-24
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Konferensbidrag (refereegranskat)abstract
- Background: The labour force is ageing due to the demographic change and the postponement of old-age retirement in many countries. Objective: In order to increase the possibility for employees to maintain their employability and to keep working in an extended working life this intervention project tested a distance education as a technique to integrate a theoretical model for a sustainable working life for all ages (the swAge-model) as a practical management tool in fourteen municipality managers’ ordinary work situation. Results: Most of the participating managers had difficulty completing the entire training program in this intervention project due to external circumstances, such as the COVID-19 pandemic and re-organisations, and because no extra time during working hours had been allocated to the managers to participate in the intervention project. Despite this, all participating managers appreciated being given the opportunity to participate and take part in the content of the intervention. Everyone considered the theoretical model, the wage model, on which the intervention project was based, to be very useful and to have given them new insights into their managerial duties. Conclusions: If society and organisations want a larger amount of employees to participate in working life until an older age, they also need to allocate working hours for managers to acquire new knowledge on how to create healthy and sustainable workplaces for all ages, as well as to implement these tools, measures and working methods permanently in the daily organisational work.
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| 14. |
- Persson, Johanna, et al.
(författare)
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User evaluation of a national e-library for standardized chemotherapy regimens
- 2021
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021) : Volume IV: Healthcare and Healthy Work - Volume IV: Healthcare and Healthy Work. - Cham : Springer International Publishing. - 2367-3370. - 9783030746117 - 9783030746100 ; 222, s. 175-181
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Konferensbidrag (refereegranskat)abstract
- An e-library for standardized chemotherapy regimens has been developed and is, since 2015, available as a national resource for healthcare staff and patients in cancer treatment in Sweden. The library was developed in a user-centered design process and is now evaluated to understand how it is used and if it is used in the intended way. This paper presents the e-library in brief together with preliminary results from the ongoing user evaluation, including results from a web survey, web page statistics, and a heuristic evaluation to identify usability issues. The evaluation is a vital part in assuring that the library works as a patient safety barrier, matches the users’ needs, and that it does not have design flaws that could introduce new risks in the already complex chemotherapy process. The results indicate that the library is being used in the intended way and the users do not have any problems interacting with it. With a broad national usage, the standardized chemotherapy regimens e-library can be a source for organizational and national learning, and a source for continuous improvement of cancer care in Sweden.
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| 15. |
- Schiefelbein, Ulf, et al.
(författare)
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Lobaria pulmonaria (L.) Hoffm. in the southwestern Baltic – Kattegat area
- 2021
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Ingår i: Folia Cryptogamica Estonica. - 1406-2070. ; 58, s. 183-197
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Tidskriftsartikel (refereegranskat)abstract
- The past and present distribution of Lobaria pulmonaria in Denmark, northern Germany, northwestern Poland and nemoral parts of Skåne, Blekinge, southwesternmost Småland and southern Öland (Sweden) has been studied. Of 124 localities visited between 2015 and 2018, L. pulmonaria was confirmed at 64 sites, at each of which its habitat ecology and viability were investigated. It is almost extinct in Schleswig-Holstein, in southern Jutland, on the Danish Islands, in southwestern Skåne, in Mecklenburg-Vorpommern and in the western part of Pomerania. It has disappeared almost completely from areas where mesophytic forests form the potential natural vegetation. The commonest habitats for L. pulmonaria are species-poor acidic beech and species-poor oak forests, and the commonest substrates are trunks of beech, followed by oak. L. pulmonaria specimens on about two thirds of the colonized trees were in a healthy condition. The situation is worst in Schleswig-Holstein and on the Danish Islands, but best in Blekinge and central and northern Jutland. Recent distribution seems to be influenced by both anthropogenic (e.g. air pollution by sulphur dioxide and nitrogen and forestry practices) and natural factors (precipitation, temperature, air humidity), as well as unnatural climatic factors (global warming).
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| 16. |
- Schiefer, Christoph, et al.
(författare)
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PEPPA - Exchange Platform for Measurements of Occupational Physical Activity and Physical Workload
- 2022
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Ingår i: Proceedings of the 21st Congress of the International Ergonomics Association, IEA 2021 : Methods and Approaches - Methods and Approaches. - Cham : Springer International Publishing. - 2367-3389 .- 2367-3370. - 9783030746131 ; 223 LNNS, s. 175-182, s. 175-182
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Konferensbidrag (refereegranskat)abstract
- Technical measurements allow an objective assessment of MSD risk factors at work. There is a need for common standards regarding data collection and processing, as well as an exchange platform storing measurement data of occupational physical activity and workload for further analysis. Several research institutes started a feasibility study to work on developing standards for assessment of risk factors and implement them in an exchange platform prototype. The first prototype already demonstrates a technical feasibility. Coordination and structure of the contents, as well as estimates of costs and efforts needed for further development need more examination in order to arrive at a final platform with good feasibility.
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| 17. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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Development of a Low-Cost Sensing Node with Active Ventilation Fan for Air Pollution Monitoring
- 2021
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Ingår i: SMSI 2021 Proceedings. ; , s. 260-261
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Konferensbidrag (refereegranskat)abstract
- A fully designed low-cost sensing node for air pollution monitoring and calibration results for several low-cost gas sensors are presented. As the state of the art is lacking information on the importance of an active ventilation system, the effect of an active fan is compared to the passive ventilation of a lamellar structured casing. Measurements obtained in an urban outdoor environment show that readings of the low-cost dust sensor (Sharp GP2Y1010AU0F) are distorted by the active ventilation system. While this behavior requires further research, a correlation with temperature and humidity inside the node shown.
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| 18. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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Gather Dust and Get Dusted : Long-Term Drift and Cleaning of Sharp GP2Y1010AU0F Dust Sensor in a Steel Factory
- 2022
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Konferensbidrag (refereegranskat)abstract
- The Sharp GP2Y1010AU0F is a widely used low-cost dust sensor, but despite its popularity, the manufacturer provides little information on the sensor. We installed 16 sensing nodes with Sharp dust sensors in a hot rolling mill of a steel factory. Our analysis shows a clear correlation between sensor drift and accumulated production of the steel factory. An eye should be kept on the long-term drift of the sensors to prevent early saturation. Two of 16 sensors experienced full saturation, each after around eight and ten months of operation.
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| 19. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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High-quality meets low-cost : Approaches for hybrid-mobility sensor networks
- 2020
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Ingår i: MATERIALS TODAY-PROCEEDINGS. - : Elsevier. ; , s. 250-253
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Konferensbidrag (refereegranskat)abstract
- Air pollution within industrial scenarios is a major risk for workers, which is why detailed knowledge about the dispersion of dusts and gases is necessary. This paper introduces a system combining stationary low-cost and high-quality sensors, carried by ground robots and unmanned aerial vehicles. Based on these dense sampling capabilities, detailed distribution maps of dusts and gases will be created. This system enables various research opportunities, especially on the fields of distribution mapping and sensor planning. Standard approaches for distribution mapping can be enhanced with knowledge about the environment's characteristics, while the effectiveness of new approaches, utilizing neural networks, can be further investigated. The influence of different sensor network setups on the predictive quality of distribution algorithms will be researched and metrics for the quantification of a sensor network's quality will be investigated.
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| 20. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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Learning From the Past : Sequential Deep Learning for Gas Distribution Mapping
- 2022
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Ingår i: ROBOT2022. - Cham : Springer. - 9783031210617 - 9783031210624 ; , s. 178-188
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Konferensbidrag (refereegranskat)abstract
- To better understand the dynamics in hazardous environments, gas distribution mapping aims to map the gas concentration levels of a specified area precisely. Sampling is typically carried out in a spatially sparse manner, either with a mobile robot or a sensor network and concentration values between known data points have to be interpolated. In this paper, we investigate sequential deep learning models that are able to map the gas distribution based on a multiple time step input from a sensor network. We propose a novel hybrid convolutional LSTM - transpose convolutional structure that we train with synthetic gas distribution data. Our results show that learning the spatial and temporal correlation of gas plume patterns outperforms a non-sequential neural network model.
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| 21. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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Super-Resolution for Gas Distribution Mapping : Convolutional Encoder-Decoder Network
- 2022
-
Ingår i: 2022 IEEE International Symposium on Olfaction and Electronic Nose (ISOEN). - : IEEE. - 9781665458603 - 9781665458610
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Konferensbidrag (refereegranskat)abstract
- Gas distribution mapping is important to have an accurate understanding of gas concentration levels in hazardous environments. A major problem is that in-situ gas sensors are only able to measure concentrations at their specific location. The gas distribution in-between the sampling locations must therefore be modeled. In this research, we interpret the task of spatial interpolation between sparsely distributed sensors as a task of enhancing an image's resolution, namely super-resolution. Because autoencoders are proven to perform well for this super-resolution task, we trained a convolutional encoder-decoder neural network to map the gas distribution over a spatially sparse sensor network. Due to the difficulty to collect real-world gas distribution data and missing ground truth, we used synthetic data generated with a gas distribution simulator for training and evaluation of the model. Our results show that the neural network was able to learn the behavior of gas plumes and outperforms simpler interpolation techniques.
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| 22. |
- Winkler, Nicolas P., 1991-, et al.
(författare)
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Using Redundancy in a Sensor Network to Compensate Sensor Failures
- 2021
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Ingår i: 2021 IEEE SENSORS. - : IEEE. - 9781728195018 - 9781728195025
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Konferensbidrag (refereegranskat)abstract
- Wireless sensor networks provide occupational health experts with valuable information about the distribution of air pollutants in an environment. However, especially low-cost sensors may produce faulty measurements or fail completely. Consequently, not only spatial coverage but also redundancy should be a design criterion for the deployment of a sensor network. For a sensor network deployed in a steel factory, we analyze the correlations between sensors and build machine learning forecasting models, to investigate how well the sensor network can compensate for the outage of sensors. While our results show promising prediction quality of the models, they also indicate the presence of spatially very limited events. We, therefore, conclude that initial measurements with, e.g., mobile units, could help to identify important locations to design redundant sensor networks.
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| 23. |
- Yung, Marcus, et al.
(författare)
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Is there a u-shaped relationship between load levels and fatigue and recovery? : An examination of possible mechanisms
- 2023
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Ingår i: Ergonomics. - : Informa UK Limited. - 0014-0139 .- 1366-5847. ; , s. 1-16
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Tidskriftsartikel (refereegranskat)abstract
- In a previous study, an unexpected u-shaped relationship was observed between load level andfatigue/recovery responses. Moderate load levels resulted in lower perceived discomfort, pain,and fatigue, and shorter recovery times compared to either low or high load levels. Thisphenomenon has been reported in other studies, but no article has examined the possiblemechanisms that might explain this u-shaped relationship. In this paper, we re-examined thepreviously published data and found that the phenomenon does not appear to be due to theexperimental artefact; the u-shape may be due to unexpectedly lower fatigue effects at moderateloads, and higher fatigue effects at lower loads. We then conducted a literature review andidentified several possible physiological, perceptual, and biomechanical explanatory mechanisms.No single mechanism explains the entirety of the phenomenon. Further research is needed onthe relationship between work exposures, fatigue, and recovery, and the mechanisms related tothe u-shaped relationship.Practitioner summary: We examine a previously observed u-shaped relationship between loadlevel and fatigue/recovery, where moderate force resulted in lower perceived fatigue andshorter recovery times. A u-shaped fatigue response suggests that simply minimising load levelsmight not be an optimal approach to reduce the risk of workplace injuries.
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