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Eye Tracking during High Speed Navigation at Sea--Field Trial in Search of Navigational Gaze Behaviour

Journal of Transportation Technologies 2012年第3期2卷 277-283页

作者： fredrik forsman Anna Sjors-Dahlman Joakim Dahlman Torbjorn Falkmer Hoe C.Lee Shipping and Marine Technology Chalmers University of TechnologyGoteborgSweden Swedish Sea Rescue Society GoteborgSweden Rehabilitation Medicine Department of Medicine and Health Sciences(IMH)Faculty of Health SciencesLinkoping University&Pain and Rehabilitation CentreLinkopingSweden The Institute of Stress Medicine GoteborgSweden Department of Rehabilitation School of Health SciencesJonkoping UniversityJonkopingSweden School of Occupational Therapy&Social Work CHIRICurtin UniversityPerthAustralia School of Occupational Therapy La Trobe UniversityMelbourneAustralia

Purpose: Professional high speed sea navigational procedures are based on turn points, courses, dangers and steering cues in the environment. Since navigational aids have become less expensive and due to the fact that electronic sea charts can be integrated with both radar and transponder information, it may be assumed that traditional navigation by using paper based charts and radar will play a less significant role in the future, especially among less experienced navigators. Possible navigational differences between experienced and non-experienced boat drivers is thus of interest with regards to their use of navigational aids. It may be assumed that less experienced navigators rely too much on the information given by the electronic sea chart, despite the fact that it is based on GPS information that can be questioned, especially in littoral waters close to land. Method: This eye tracking study investigates gaze behaviour from 16 ex perienced and novice boat drivers during high speed navigation at sea. Results: The results show that the novice drivers look at objects that are close to themselves, like instrumentation, while the experienced look more at objects far away from the boat. This is in accordance with previous research on car drivers. Further, novice boat drivers used the electronic navigational aids to a larger extent than the experienced, especially during high speed conditions. The experienced drivers focused much of their attention on objects outside the boat. Conclusions: The findings verify that novice boat drivers tend to rely on electronic navigational aids. Experienced drivers presumably use the navigational aids to verify what they have observed in the surrounding environment and further use the paper based sea chart to a larger extent than the novice drivers.

关键词： Eye Tracking Navigation Driving Experience Vision

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Development and evaluation of a vision driven sensor for estimating fuel feeding rates in combustion and gasification processes

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Energy and AI 2024年第1期15卷 44-54页

作者： YngveÖren Alexey Sepman Ehsan Fooladgar fredrik Weiland Henrik Wiinikka RISE AB Box 726 SE-94128PiteåSweden Energy Engineering Division of Energy ScienceLuleåUniversity of TechnologySE 97187LuleåSweden

A machine vision driven sensor for estimating the instantaneous feeding rate of pelletized fuels was developed and tested experimentally in combustion and gasification *** feeding rate was determined from images of the pellets sliding on a transfer chute into the *** the images the apparent area and velocity of the pellets were *** was determined by a segmentation model created using a machine learning framework and velocities by image registration of two subsequent *** measured weight of the pelletized fuel passed through the feeding system was in good agreement with the weight estimated by the *** observed variations in the fuel feeding correlated with the variations in the gaseous species concentrations measured in the reactor core and in the *** the developed sensor measures the ingoing fuel feeding rate prior to the reactor,its signal could therefore help improve process control.

关键词： Fuel feeding Process monitoring Image processing Neural network Combustion Gasification

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Elasto-inertial focusing and particle migration in high aspect ratio microchannels for highthroughput separation

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Microsystems & Nanoengineering 2024年第3期10卷 381-394页

作者： Selim Tanriverdi Javier Cruz Shahriar Habibi Kasra Amini Martim Costa fredrik Lundell Gustaf Mårtensson Luca Brandt Outi Tammisola Aman Russom Division of Nanobiotechnology Department of Protein ScienceScience for Life LaboratoryKTH Royal Institute of TechnologySolna 17165Sweden Division of Microsystems Technology Department of Materials Science and EngineeringUppsala UniversityUppsala 75237Sweden FLOW and SeRC(Swedish e-Science Research Centre) Department of Engineering MechanicsRoyal Institute of TechnologyStockholm SE 10044Sweden FLOW and Fluid Physics Laboratory Department of Engineering MechanicsRoyal Institute of TechnologyStockholmSweden Wallenberg Wood Science Center Royal Institute of TechnologyStockholm SE 10044Sweden Department of Energy and Process Engineering Norwegian University of Science and Technology(NTNU)TrondheimNorway AIMES Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology StockholmSweden

The combination of flow elasticity and inertia has emerged as a viable tool for focusing and manipulating particles using *** there is considerable interest in the field of elasto-inertial microfluidics owing to its potential applications,research on particle focusing has been mostly limited to low Reynolds numbers(Re<1),and particle migration toward equilibrium positions has not been extensively *** this work,we thoroughly studied particle focusing on the dynamic range of flow rates and particle migration using straight microchannels with a single inlet high aspect *** initially explored several parameters that had an impact on particle focusing,such as the particle size,channel dimensions,concentration of viscoelastic fluid,and flow *** experimental work covered a wide range of dimensionless numbers(0.05

关键词： particle separation straight

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The role of intravenous glutamine administration in critical care patients with acute kidney injury:a narrative review

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Emergency and Critical Care Medicine 2024年第3期4卷 117-125页

作者： Jonny Jonny Astrid Devina Larasati Bunga Pinandhita Ramadhani Bhimo Aji Hernowo Taufiq fredrik Pasiak Faculty of Medicine Universitas Prima IndonesiaMedanIndonesia Department of Internal Medicine Gatot Soebroto Central Army HospitalDKI JakartaIndonesia Faculty of Medicine of the Jakarta Veteran National Development University DKI JakartaIndonesia Faculty of Military Medicine Indonesia Defense UniversityWest JavaIndonesia

The kidneys are complex organs responsible for waste removal and various regulatory *** ill patients often experience acute kidney injury(AKI).Although renal replacement therapy is used to manage AKI,nutritional therapy is ***,an amino acid involved in cellular functions,has potential benefits when administered intravenously to critically ill *** administration is associated with reduced mortality rates,infectious complications,and hospitalization ***,its use in patients with AKI remains *** is used by various organs,including the kidneys,and its metabolism affects several important *** glutamine supplementation at specific doses can improve blood marker levels and restore plasma glutamine ***,this supplementation reduces infections,enhances immune responses,decreases disease severity scores,and reduces complications in critically ill ***,caution is advised in patients with multiple organ failure,particularly AKI,as high doses of glutamine may increase mortality *** can have adverse *** and appropriate dosing can help to mitigate these *** rely on glutamine for various essential ***,the use of intravenous glutamine in critically ill patients with AKI remains *** its potential benefits in terms of infection reduction,immunomodulation,and improved outcomes,careful consideration of the patient’s condition,dosage,and treatment duration is *** research is needed to establish optimal guidelines for glutamine administration in this patient population.

关键词： Acute kidney injury Critical illness Glutamine Parenteral nutrition

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Impact of weather conditions and building design on contaminant infiltration from crawl spaces in Swedish schools-Numerical modeling using Monte Carlo method

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Building Simulation 2022年第5期15卷 845-858页

作者： fredrik Domhagen Paula Wahlgren Carl-Eric Hagentoft Department for Architecture and Civil Engineering Division of Building TechnologyChalmers University of TechnologySE-41296GothenburgSweden

Some Swedish school buildings built in the 1960s and 1970s experience indoor air quality problems,where the contaminants are suspected to come from the crawl space underneath the *** poor indoor air quality causes discomfort among pupils and *** an exhaust fan to maintain a negative pressure difference in the crawl space relative to indoors or increasing the ventilation in the classroom are two examples of common measures taken to improve the indoor air ***,these measures are not always effective,and sometimes the school building has to be *** relation between pressure distribution,contaminant concentration in the classroom,outdoor temperature,wind,mechanical ventilation,and air leakage distribution is complex.A better understanding of these relations is crucial for making decisions on the most efficient measure to improve the indoor air *** this paper,a model for contaminant infiltration from the crawl space is used together with the Monte Carlo method to study these *** are performed for several cases where different building shapes,building orientations,shielding conditions,and geographical locations are *** show,for example,that for a building with an imbalanced ventilation system,air is leaking from the crawl space to the classroom for the majority of cases and that concentration levels in the classroom are usually the highest during mild and calm days.

关键词： airtightness air permeability Monte Carlo method infiltration model crawl space indoor air quality

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Effect of rock joints on lined rock caverns subjected to high internal gaspressure

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1625-1635页

作者： Davi Rodrigues Damasceno Johan Spross fredrik Johansson Division of Soil and Rock Mechanics KTH Royal Institute of TechnologySE-10044StockholmSweden

The storage of hydrogen gas in lined rock caverns(LRCs)may enable the implementation of the firstlarge-scale fossil-free steelmaking process in Sweden,but filling such storage causes joints in the rockmass to open,concentrating strains in the *** structural interaction between the LRC componentsmust be able to reduce the strain concentration in the sealing steel lining;however,this interaction iscomplex and difficult to predict with analytical *** this paper,the strain concentration in LRCsfrom the opening of rock joints is studied using finite element(FE)analyses,where the large-and small-scale deformation behaviors of the LRC are *** model also includes concrete crack initiation anddevelopment with increasing gas pressure and rock joint *** interaction between the jointed rockmass and the reinforced concrete,the sliding layer,and the steel lining is *** results showthat the rock mass quality and the spacing of the rock joints have the greatest influence on the straindistributions in the steel *** largest effect of rock joints on the maximum strains in the steellining was observed for geological conditions of“good”quality rock masses.

关键词： Lined rock cavern(LRC) Rock joints Strain concentrations Lining interaction Finite element(FE)analysis High gas pressure

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Efficient construction of linear models in materials modeling and applications to force constant expansions

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npj Computational Materials 2020年第1期6卷 527-537页

作者： Erik Fransson fredrik Eriksson Paul Erhart Department of Physics Chalmers University of TechnologyGothenburgSweden

Linear models,such as force constant(FC)and cluster expansions,play a key role in physics and materials *** they can in principle be parametrized using regression and feature selection approaches,the convergence behavior of these techniques,in particular with respect to thermodynamic properties is not well ***,we therefore analyze the efficacy and efficiency of several state-of-the-art regression and feature selection methods,in particular in the context of FC extraction and the prediction of different thermodynamic properties.

关键词： properties thermodynamic constant

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Rock mass response for lined rock caverns subjected to high internal gas pressure

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 119-129页

作者： Davi Rodrigues Damasceno Johan Spross fredrik Johansson Division of Soil and Rock Mechanics KTH Royal Institute of TechnologySE-10044StockholmSweden

The storage of hydrogen gas in underground lined rock caverns(LRCs)enables the implementation of the first fossil-free steelmaking process to meet the large demand for crude *** the response of rock mass is important to ensure that gas leakage due to rupture of the steel lining does not *** and numerical models can be used to estimate the rock mass response to high internal pressure;however,the fitness of these models under different in situ stress conditions and cavern shapes has not been *** this paper,the suitability of analytical and numerical models to estimate the maximum cavern wall tangential strain under high internal pressure is *** analytical model is derived in detail and finite element(FE)models considering both two-dimensional(2D)and three-dimensional(3D)geometries are *** models are verified with field measurements from the LRC in Skallen,southwestern *** analytical model is inexpensive to implement and gives good results for isotropic in situ stress conditions and large cavern *** the case of anisotropic horizontal in situ stresses,as the conditions in Skallen,the 3D FE model is the best approach.

关键词： Lined rock caverns(LRCs) High pressure Rock mass response In situ stress condition Cavern shape Gas storage

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Employing nanoparticle tracking analysis of salivary neuronal exosomes for early detection of neurodegenerative diseases

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Translational Neurodegeneration 2023年第1期12卷 791-800页

作者： Vaibhav Sharma fredrik Nikolajeff Saroj Kumar Department of Health Education and TechnologyLulea University of TechnologyLuleaSweden Department of Biophysics All India Institute of Medical SciencesNew DelhiIndia

Neurodegenerative diseases are a set of progressive and currently incurable diseases that are primarily caused by neuron *** diseases often lead to cognitive impairment and *** is now well recognized that molecular events precede the onset of clinical symptoms by *** the past decade,intensive research attempts have been aimed at the early diagnosis of these ***,exosomes have been shown to play a pivotal role in the occurrence and progression of many diseases including cancer and neurodegenerative ***,because exosomes can cross the blood-brain barrier,they may serve as a diagnostic tool for neural *** this review,we detail the mechanisms and current challenges of these diseases,briefly review the role of exosomes in the progression of neurodegenerative diseases,and propose a novel strategy based on salivary neuronal exosomes and nanoparticle tracking analysis that could be employed for screening the early onset of neurodegenerative diseases.

关键词： Exosomes Parkinson’s disease Alzheimer’s disease Neurodegenerative disease Diagnosis Prognosis Extracellular vesicles Nanoparticle tracking analysis

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Influence of location of large-scale asperity on shear strength of concrete-rock interface under eccentric load

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 449-460页

作者： Dipen Bista Gabriel Sas fredrik Johansson Leif Lia SINTEF Narvik As Narvik8517Norway Norwegian University of Science and Technology(NTNU) Trondheim7491Norway Royal Institute of Technology(KTH) Stockholm10044Sweden

The location and geometry of large-scale asperity present at the foundation of concrete gravity dams and buttress dams affect the shear resistance of the concrete-rock ***,the parameters describing the frictional resistance of the interface usually do not account for these *** could result in an underestimate of the peak shear stre ngth,which leads to significantly conservative design for new dams or unnecessary stability enhancing measures for existing *** aim of this work was to investigate the effect of the location of first-order asperity on the peak shear strength of a concrete-rock interface under eccentric load and the model discrepancy associated with the commonly used rigid body methods for calculating the factor of safety(FS)against *** this,a series of direct and eccentric shear tests under constant normal load(CNL)was carried out on concrete-rock *** peak shear strengths measured in the tests were compared in terms of asperity location and with the predicted values from analytical rigid body *** results showed that the large-scale asperity under eccentric load significantly affected the peak shear ***,unlike the conventional assumption of sliding or shear failure of an asperity in direct shear,under the effect of eccentric shear load,a tensile failure in the rock or in the concrete could occur,resulting in a lower shear strength compared with that of direct shear *** results could have important implications for assessment of the FS against sliding failure in the concrete-rock interface.

关键词： Shear strength Concrete-rock interface Asperity location Eccentric load Model discrepancy Dam foundation

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