| 1. |
- Liu, Yuanhua, 1971, et al.
(author)
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Considering the importance of user profiles in interface design
- 2009
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In: User Interfaces. ; , s. 23-
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Book chapter (other academic/artistic)abstract
- User profile is a popular term widely employed during product design processes by industrial companies. Such a profile is normally intended to represent real users of a product. The ultimate purpose of a user profile is actually to help designers to recognize or learn about the real user by presenting them with a description of a real user’s attributes, for instance; the user’s gender, age, educational level, attitude, technical needs and skill level. The aim of this chapter is to provide information on the current knowledge and research about user profile issues, as well as to emphasize the importance of considering these issues in interface design. In this chapter, we mainly focus on how users’ difference in expertise affects their performance or activity in various interaction contexts. Considering the complex interaction situations in practice, novice and expert users’ interactions with medical user interfaces of different technical complexity will be analyzed as examples: one focuses on novice and expert users’ difference when interacting with simple medical interfaces, and the other focuses on differences when interacting with complex medical interfaces. Four issues will be analyzed and discussed: (1) how novice and expert users differ in terms of performance during the interaction; (2) how novice and expert users differ in the perspective of cognitive mental models during the interaction; (3) how novice and expert users should be defined in practice; and (4) what are the main differences between novice and expert users’ implications for interface design. Besides describing the effect of users’ expertise difference during the interface design process, we will also pinpoint some potential problems for the research on interface design, as well as some future challenges that academic researchers and industrial engineers should face in practice.
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| 2. |
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| 3. |
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| 4. |
- Lind, Carl, et al.
(author)
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Reducing postural load in order picking through a smart workwear system using real-time vibrotactile feedback
- 2020
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In: Applied Ergonomics. - : Elsevier. - 0003-6870 .- 1872-9126. ; 89
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Journal article (peer-reviewed)abstract
- Vibrotactile feedback training may be one possible method for interventions that target at learning better work techniques and improving postures in manual handling. This study aimed to evaluate the short term effect of real-time vibrotactile feedback on postural exposure using a smart workwear system for work postures intervention in simulated industrial order picking. Fifteen workers at an industrial manufacturing plant performed order-picking tasks, in which the vibrotactile feedback was used for postural training at work. The system recorded the trunk and upper arm postures. Questionnaires and semi-structured interviews were conducted about the users’ experience of the system. The results showed reduced time in trunk inclination ≥20°, ≥30° and ≥45° and dominant upper arm elevation ≥30° and ≥45° when the workers received feedback, and for trunk inclination ≥20°, ≥30° and ≥45° and dominant upper arm elevation ≥30°, after feedback withdrawal. The workers perceived the system as useable, comfortable, and supportive for learning. The system has the potential of contributing to improved postures in order picking through an automated short-term training program. © 2020 Elsevier Ltd
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| 5. |
- Berlin, Cecilia, 1981, et al.
(author)
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Fysisk arbetsmiljö för hälsa, välmående och prestation
- 2020
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Reports (other academic/artistic)abstract
- Denna rapport har till syfte att ge en kunskaps-översikt över tillgänglig forskning på temat ”Fysisk arbetsmiljö för hälsa, välmående och prestation”. Kunskapsöversiktens innehåll fokuserar på hur en frisk och välmående fysisk arbetsplats utformas, för att ge förutsättningar för god arbetsprestation parallellt med hög grad av välmående. Rapporten är avsiktligen vinklad bort från problemfokuserad litteratur om skaderisker, likaså om insatser för hälsopromotion som syftar till att individen tar ett större eget ansvar för att öka sin fysiska aktivitet eller ändring av livsstil. Istället riktas fokus mot friskfaktorer som härrör från en väl genomtänkt och avsiktlig formgivning (design) av arbetsplatsen, både i form av layout och dess ingående tekniska lösningar (exempelvis utrustningar, möbler med mera). Översikten inkluderar till stor del litteratur från ergonomi- och design-fältet, i syfte att betona kunskap om den avsiktligt formgivna arbetsmiljön och dess ingående designparametrar. En systematisk litteratursökning har genomförts med sökning i två databaser, Scopus och Web of Science. Till en början identifierades 4299 sökträffar som uppfyllde sökkriterierna. Efter sållning, granskning av abstracts och kvalitetsutvärdering av 446 fulltexter inkluderades och kategoriserades till slut 317 artiklar i två huvudsakliga kategorier: 196 primär- och litteraturstudier om fysisk belastning på arbetsplatser, samt 121 designprocessorienterade artiklar vars innehåll ger råd om, vägleder och organiserar formgivningen av en hälsosam och välfungerande fysisk arbetsplats. Kvalitetsgranskning genomfördes på samtliga inkluderade artiklar; empiriska primärstudier utvärderades med McGill Mixed Methods Appraisal Tool (MMAT), litteraturstudier med Critical Appraisal Skills programmes (CASP) mall för kunskapsöversikter, och den designprocessorienterade litteraturen genomgick en förenklad kvalitetsgranskning med specialanpassad mall. Den inkluderade kunskapen spänner över många olika studietyper, metodansatser, interventionsavsikter och yrkesgrupper. Inom kategorin primär- och litteraturstudier identifierades fältstudier (134), laboratoriska studier (45), enkätbaserade tvärsnittsstudier (53) och litteraturstudier (14). Ett första resultat var att friskfaktorer av olika slag identifierades; dessa uttrycks oftast i form av önskade utfall som är spridda över ett spektrum mellan välbefinnande å ena sidan och prestation å andra sidan, till exempel välmående, nöjdhet, återhämtning, komfort, engagemang, prestation, produktivitet, effektivitet, kreativitet, problemlösning och samarbete. Vissa ”negativt” formulerade utfall är också indikatorer på fysisk belastningsfriskhet, till exempel minskad stress, fysisk belastning, fysisk skaderisk eller felhandling. Som synes håller sig inte alla dessa utfall strikt till den fysiska arbetsmiljön, utan påverkar även kognitiva och organisatoriska friskfaktorer. Resultaten redovisades även indelat i de yrkeskategorier som kunde betraktas som utmärkande i materialet. Den största proportionen av yrkesrelaterad litteratur om friskfaktorer handlar om kunskapsarbete (som domineras av kontorsstudier), följt av studier från vårdsektorn, därefter från industriella tillämpningar (inklusive byggbranschen) och därefter övriga yrken och studier som inkluderar flera yrkeskategorier samtidigt. Den design-processorienterade litteraturen innehåller mycket vägledning i hur arbetsplatser bör utformas generellt för att förbättra friskhet. De flesta studier om designprocesser som ger processrekommendationer om hur utformningsarbetet bör fortlöpa och organiseras rekommenderar en deltagande (participativ) ansats, för att skapa bättre förståelse för medarbetarnas behov och skapa engagemang under designprocessen både för design av arbetsredskap och av arbetsplatser. Det finns dock en del studier som visar att deltagande processer inte alltid leder till önskade effekter. Andra värdefulla bidrag från denna litteraturkategori berör användandet av olika verktyg för simulering och utvärdering samt metoder för att bedöma lämpligheten av arbetsplatsutformningen för specifika grupper av användare. Både arbetsplatsdesign och tekniska produktlösningar för att stödja friskhet på arbetsplatsen har utvärderats av litteraturen. Ett fåtal studier fokuserade på att utvärdera arbetsredskap för olika yrkeskategorier, ofta med belastningsergonomiska och riskkartläggande perspektiv, men även med hänsyn till aspekter som nöjdhet, preferens och användarvänlighet. Andra specifika spår i litteraturen är artiklar om sittande och stående, särskilda arbetskrav och förutsättningar för äldre arbetskraft, återhämtning. Användning av nya teknikutvecklingar i design- och utvärderingsprocesser är en annan trend som syns i litteraturen. Rapporten lyfter fram tre områden som kan bli allt vanligare: robotar som arbetsredskap inklusive hur arbetsfördelning mellan robotar och människor bör ske, användning av bärbar teknologi (wearables) eller rörelseregistrerande teknik (till exempel sensorer och kameror) för aktivitets- och/eller biometrisk mätning och slutligen ökad användning av simuleringar, exempelvis via så kallade digitala tvillingar, för design och underhåll av arbetsplatser. Enligt en kategori studier framhålls att designmässiga arbetsplatsförändringar bör kombineras med utbildning, träning och kunskapskomplettering för att uppnå beteendeförändringar hos användare av arbetsplatsen eller arbetsredskapen, detta för att erhålla de största och mest varaktiga effekterna på hälsa och välmående. Den designprocessorienterade litteraturen gav en rik och varierad vägledning i olika processer, ansatser, verktyg och metoder för hur en friskhetsfrämjande arbetsplatsdesign kan stödjas. Bidragen kan vara vägledande både för individ- och makroperspektiv, det vill säga systemsynen i artiklarna varierar mellan olika systemnivåer och kan vägleda såväl olika processteg som val och utvärdering av specifika utrustningar och layouter samt ge råd för hur en deltagande process som involverar medarbetarna bör gå till. Bland verktygen som beskrivs för dessa ändamål finns metoder, analytiska modeller, mätutrustningar och simuleringstekniker. Denna översikt hade en bred ansats, vilket har visat sig vara både en styrka och en svaghet. Det är svårt att finna klara, allmänna rekommendationer med hänsyn till så många olika specialsammanhang och skilda arbetssystems syften. Även om renodlade studier om enskilda ”friskhetsfrämjande” faktorer finns, är multi-utfallsinriktade ansatser en mycket mer intressant och relevant väg att gå för framtida forskning och utveckling. För att komma längre och djupare med sådana kombinationer av syften, tror författarna att en framgångsfaktor är att begränsa sig till fördjupade studier inom avgränsade yrkesområden, till exempel industri, vård, kunskapsarbete och andra, mer specifika områden som i denna översikt har sammanförts med andra kategorier. En ytterligare rekommenderad fördjupning skulle vara att fokusera på utvärderingar av belastningsreducerande arbetsredskap, särskilt i syfte att vägleda organisationer, arbetsgivare och formgivare i processen att upphandla, välja, införskaffa och implementera utrustning och arbetsredskap. Något som bör beforskas mer är parallella utvärderingar av fysisk och kognitiv (eller mental) arbetsbelastning från samma arbete. Detta är svårt men mycket viktigt att undersöka. Denna studie har även funnit få bidrag som berör tidsrelaterade faktorer som till exempel schemaläggning, rotation med mera, vilka presenterats som strategier för en hälsosammare grad av fysisk belastning i arbetet. En närbesläktad aspekt som vore intressant att undersöka närmare är hur interaktionen med digitala gränssnitt påverkar den fysiska belastningen, då användningen av fler digitala tjänster leder till mer fysisk interaktion med ”smarta” gränssnitt och handhållna/bärbara tekniker både i våra yrken och privat. Vidare identifierade översikten få studier som beskriver misslyckade designprocesser.
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| 6. |
- Isaksson-Daun, Johan
(author)
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A Sound Approach Toward a Mobility Aid for Blind and Low-Vision Individuals
- 2023
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Doctoral thesis (other academic/artistic)abstract
- Reduced independent mobility of blind and low-vision individuals (BLVIs) cause considerable societal cost, burden on relatives, and reduced quality of life for the individuals, including increased anxiety, depression symptoms, need of assistance, risk of falls, and mortality. Despite the numerous electronic travel aids proposed since at least the 1940’s, along with ever-advancing technology, the mobility issues persist. A substantial reason for this is likely several and severe shortcomings of the field, both in regards to aid design and evaluation.In this work, these shortcomings are addressed with a generic design model called Desire of Use (DoU), which describes the desire of a given user to use an aid for a given activity. It is then applied on mobility of BLVIs (DoU-MoB), to systematically illuminate and structure possibly all related aspects that such an aid needs to aptly deal with, in order for it to become an adequate aid for the objective. These aspects can then both guide user-centered design as well as choice of test methods and measures.One such measure is then demonstrated in the Desire of Use Questionnaire for Mobility of Blind and Low-Vision Individuals (DoUQ-MoB), an aid-agnostic and comprehensive patient-reported outcome measure. The question construction originates from the DoU-MoB to ensure an encompassing focus on mobility of BLVIs, something that has been missing in the field. Since it is aid-agnostic it facilitates aid comparison, which it also actively promotes. To support the reliability of the DoUQ-MoB, it utilizes the best known practices of questionnaire design and has been validated once with eight orientation and mobility professionals, and six BLVIs. Based on this, the questionnaire has also been revised once.To allow for relevant and reproducible methodology, another tool presented herein is a portable virtual reality (VR) system called the Parrot-VR. It uses a hybrid control scheme of absolute rotation by tracking the user’s head in reality, affording intuitive turning; and relative movement where simple button presses on a controller moves the virtual avatar forward and backward, allowing for large-scale traversal while not walking physically. VR provides excellent reproducibility, making various aggregate movement analysis feasible, while it is also inherently safe. Meanwhile, the portability of the system facilitates testing near the participants, substantially increasing the number of potential blind and low-vision recruits for user tests.The thesis also gives a short account on the state of long-term testing in the field; it being short is mainly due to that there is not much to report. It then provides an initial investigation into possible outcome measures for such tests by taking instruments in use by Swedish orientation and mobility professionals as a starting point. Two of these are also piloted in an initial single-session trial with 19 BLVIs, and could plausibly be used for long-term tests after further evaluation.Finally, a discussion is presented regarding the Audomni project — the development of a primary mobility aid for BLVIs. Audomni is a visuo-auditory sensory supplementation device, which aims to take visual information and translate it to sound. A wide field-of-view, 3D-depth camera records the environment, which is then transformed to audio through the sonification algorithms of Audomni, and finally presented in a pair of open-ear headphones that do not block out environmental sounds. The design of Audomni leverages the DoU-MoB to ensure user-centric development and evaluation, in the aim of reaching an aid with such form and function that it grants the users better mobility, while the users still want to use it.Audomni has been evaluated with user tests twice, once in pilot tests with two BLVIs, and once in VR with a heterogenous set of 19 BLVIs, utilizing the Parrot-VR and the DoUQ-MoB. 76 % of responders (13 / 17) answered that it was very or extremely likely that they would want use Audomni along with their current aid. This might be the first result in the field demonstrating a majority of blind and low-vision participants reporting that they actually want to use a new electronic travel aid. This shows promise that eventual long-term tests will demonstrate an increased mobility of blind and low-vision users — the overarching project aim. Such results would ultimately mean that Audomni can become an aid that alleviates societal cost, reduces burden on relatives, and improves users’ quality of life and independence.
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| 7. |
- Abtahi, Farhad, 1981-, et al.
(author)
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Big Data & Wearable Sensors Ensuring Safety and Health @Work
- 2017
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In: GLOBAL HEALTH 2017, The Sixth International Conference on Global Health Challenges. - 9781612086040
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Conference paper (peer-reviewed)abstract
- —Work-related injuries and disorders constitute a major burden and cost for employers, society in general and workers in particular. We@Work is a project that aims to develop an integrated solution for promoting and supporting a safe and healthy working life by combining wearable technologies, Big Data analytics, ergonomics, and information and communication technologies. The We@Work solution aims to support the worker and employer to ensure a healthy working life through pervasive monitoring for early warnings, prompt detection of capacity-loss and accurate risk assessments at workplace as well as self-management of a healthy working life. A multiservice platform will allow unobtrusive data collection at workplaces. Big Data analytics will provide real-time information useful to prevent work injuries and support healthy working life
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| 8. |
- Liu, Yuanhua, 1971
(author)
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Usability Evaluation of Medical Technology: Investigating the Effect of User Background and Users' Expertise
- 2009
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Doctoral thesis (other academic/artistic)abstract
- Medical devices play a major role in diagnosis and therapeutics in the healthcare systems. The basic features of medical devices concern safety and efficient clinical performance. Nowadays, usability evaluation is an important part of the design process of medical devices. The aims of this thesis work were to investigate the effect of user profiles on usability evaluation results and to provide practical advice on choice of users as test subjects when conducting usability evaluations of medical devices. Five studies, with analytical and empirical evaluation approaches with different foci, were included in the work. In the studies, consideration was given to user background and users’ expertise as well as to user interfaces of different levels of complexity. The user background aspect was taken as the focus for the analytical evaluation approach, while users’ expertise was taken as the focus for the empirical evaluation approach. Cognitive Walkthrough was employed as an example of an analytical evaluation method to investigate user background, while usability tests were used as an example of empirical evaluation method to investigate users’ expertise. The results showed that medical device user background settings can influence the outcome of an analytical evaluation results, i.e. when more ergonomic factors were included in the user background settings, a wider range of usability problems were detected. User expertise is an important factor for the results of empirical usability tests. Users’ familiarity with tasks can be used as an important criterion for classification of user expertise. The quantitative analysis of the empirical evaluations implies that the effect of users’ expertise may be invisible when interacting with a simple user interface, but visible when interacting with a more complex user interface. Expert users outperformed novice users when interacting with a complex interface but not when interacting with a simple interface.The qualitative analysis of verbal explanations and statements, causes of errors and redesign proposals stressed the differences between novice and expert users in terms of decision-making, presentation and judgment, which implied that expert users’ use experience and novice users’ interaction experience differ in contributing to product design and development. Insufficient domain and interaction knowledge were consistently identified as typical causes of errors for novice users. The differences of information organization between previously experienced user interfaces and the interfaces interacted in the usability tests affected expert users’ task completion. Expert users made task-related errors due to terminology issues and interaction-related errors due to their ‘old’ mental model of how to interact with the user interface. Based on the results, different strategies are suggested to be used when choosing test subjects for usability evaluations in different interaction situations. A guideline and some practical advices were proposed as well to medical industrial companies about how to conduct usability evaluations on medical devices.
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| 9. |
- Löfqvist, Lotta, et al.
(author)
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An analytical ergonomic risk evaluation of body postures during daily cleaning tasks in horse stables
- 2015
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In: Work. - 1051-9815 .- 1875-9270. ; 51:4, s. 667-682
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Journal article (peer-reviewed)abstract
- BACKGROUND: Musculoskeletal disorders (MSDs) are a common reason for health problems and sick leave in many professions. A work arena where MSDs have not been sufficiently studied is stable work. Here many heavy and repetitive work tasks are performed manually with old-fashioned working tools.OBJECTIVE: The aim of this study was to use an analytical approach to identify, evaluate and grade ergonomic problems in physical work performed during daily activities in horse stables and relate these to MSDs among the workers and to the design of the tools.METHODS: Three common work tasks were studied to identify, evaluate and grade ergonomic problems; mucking out, sweeping and bedding replacement. Used methods were Hierarchical Task Analysis, Heuristic Evaluation and Rapid Entire Body Assessment.RESULTS: Several high-risk operations were found in mucking out boxes and disposal of bedding material. The problems consisted of awkward working postures such as a twisted and bent back, arms in an elevated position, wrists in extreme joint positions and handling of heavy loads.CONCLUSIONS: By using an analytical approach it is possible to identify presumptive ergonomic problems without extensive empirical research. In most high-risk operations, long-shafted tools or a wheelbarrow were used, which emphasize a need to develop tools with better ergonomic design to improve the working situation. The limitation is that the ergonomics problems found are not finally validated. The results show where deeper empirical research is needed, both regarding how MSDs occur and how tools and environment contribute to physical problems.
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| 10. |
- Sandsjö, Leif, 1958, et al.
(author)
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Clinical evaluation of a myofeedback-based teletreatment service applied in the workplace: a randomized controlled trial
- 2010
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In: Journal of Telemedicine and Telecare. - : SAGE Publications. - 1357-633X .- 1758-1109. ; 16:6, s. 329-335
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Journal article (peer-reviewed)abstract
- We evaluated the clinical effects of a myofeedback-based teletreatment service in terms of pain, pain-related disability and work ability. We also investigated the time investment/ savings of this treatment with respect to conventional care. Sixtyfive women with neck and shoulder pain at work participated in the study. Thirty-three took part in the teletreatment and 32 participated in a control group which continued with conventional care. Questionnaires were completed before the start of the intervention (baseline) and at initial follow-up (T0) and 3 months (T3) after the intervention ended. A general linear model analysis for repeated measurements showed an improvement in terms of pain and work ability for both groups taken together, with no differences between them. Non-parametric tests showed an intervention effect in painrelated disability for both groups together and no differences between them when tested at baseline, T0 and T3. The time saved in relation to conventional care was mainly from reduced travel time, which was 41 min per teleconsultation. The teletreatment service allowed employees to take part in muscle relaxation training while performing their regular work. The clinical evaluation showed that the treatment was on par with conventional care, but without the effort and time loss associated with regular visits to the clinic. We conclude that the myofeedback-based teletreatment service has potential for addressing neck and shoulder symptoms at the workplace.
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