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Helsingin yliopiston avoin julkaisuarkisto Helda tarjoaa vapaasti luettavaksi Helsingin yliopiston tutkimusjulkaisuja, väitöskirjoja, tutkielmia, kirjoja, julkaisusarjoja, raportteja sekä muuta yliopistossa tuotettua aineistoa. Heldaan tallennetaan vuosittain yli 10 000 julkaisua. Heldassa julkaistun aineiston säilytyksestä huolehditaan, ja jokainen julkaisu saa pysyvän osoitteen.

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Uusimmat julkaisut

Skeematesti : skeema
(Helsingin yliopisto, 2026-06-22) Metsä, Maaret; Helsingin yliopisto, Maatalous-metsätieteellinen tiedekunta; University of Helsinki, Faculty of Agriculture and Forestry; Helsingfors universitet, Agrikultur-forstvetenskapliga fakulteten
Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.
Testaan kandiprosessia kokonaisuudessaan : jotta nähdään, että kaikki toimii
(Helsingin yliopisto, 2026-06-08) Humppula, Henkka; Helsingin yliopisto, Humanistinen tiedekunta; University of Helsinki, Faculty of Humanities; Helsingfors universitet, Humanistiska fakulteten
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Testataan maisteriprosessia kokonaisuudessaan : jotta nähdään, että mikään ei ole pielessä
(Helsingin yliopisto, 2026-06-08) Lääkis, Lisbet; Helsingin yliopisto, Lääketieteellinen tiedekunta; University of Helsinki, Faculty of Medicine; Helsingfors universitet, Medicinska fakulteten
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The urban physical environment and leisure-time physical activity in early midlife : a FinnTwin12 study
(MDPI AG, 2025-07) Wang, Zhiyang; Aaltonen, Sari; Teeuwen, Roos; Milias, Vasileios; Peuters, Carmen; Raimbault, Bruno; Palviainen, Teemu; Lumpe, Erin; Dick, Danielle; Salvatore, Jessica E.; Foraster, Maria; Dadvand, Payam; Júlvez, Jordi; Psyllidis, Achilleas; van Kamp, Irene; Kaprio, Jaakko; Petters, M. D.; Institute for Molecular Medicine Finland; University of Helsinki; Helsinki Institute of Life Science; Mikkeli; Faculty of Law; Genetic Epidemiology
Under the exposome framework, this study examined the relationship between the urban physical environment and leisure-time physical activity during early midlife based on 394 participants (mean age: 37, range 34–40) from the FinnTwin12 cohort, residing in five major Finnish cities in 2020. We curated 145 urban physical exposures based on residential addresses and measured three outcomes: total leisure-time physical activity (total LTPA) and two sub-domains: leisure-time physical activity without commuting activity (LTPA) and commuting activity. K-prototypes clustering identified three urban clusters: “original city center,” “new city center,” and “suburban,” each with distinct environmental patterns. Regression models showed that participants in the “suburban” cluster had lower levels of total LTPA and LTPA compared to those in the “original city center” cluster, while we found null findings for commuting activity. Then, repeated regression models with a p-value threshold of 0.01 were used to initially select candidates. eXtreme Gradient Boosting models identified greenspaces and road characteristics as the top important factors influencing total LTPA, while pocket park and greenness were ranked as the top important factors influencing LTPA. The relationships were non-linear. There were thresholds for the count and size of pocket parks within 800 m walking distance and the modified soil adjusted vegetation index, determining whether they positively or negatively predict LTPA. Our findings suggested that the urban environment in Finnish cities was associated with leisure-time physical activity, which revealed new residential pattern and identified key exposures of road, pocket park, and greenness with non-linear effect, that can guide future policies.
Testi Scopus 2.6.2026 &3.7.2026 PJK - Social resources, work demands and workplace commitment among Finnish school principals and teachers
(EMERALD GROUP PUBLISHING LTD, 2026-12-14) Mäkinen, Jukka; Upadyaya, Katja; Hietajärvi, Lauri; University of Helsinki; Department of Education; Doctoral Programme in Cognition, Learning, Instruction and Communication
Purpose – This study examines whether associations of workplace social resources, work demands and workplace commitment differ between Finnish school principals and teachers. Since the educators' work environment is becoming more complex and fragmented, the study also examines whether social resources buffer the negative effects of work demands on workplace commitment. Design/methodology/approach – A cross-sectional study design was employed using data from the Finnish Principal Barometer (N = 498) and Finnish Teacher's Occupational Wellbeing Study (N = 1855). The study used instruments from the Copenhagen Psychosocial Questionnaire (COPSOQ), with a focus on social support from supervisor, social support from colleagues, social community at work, emotional demands, cognitive demands, role conflicts and commitment to the workplace. Multigroup structural equation modeling (MG-SEM) in R was used to analyze direct and interaction effects. Findings – The findings indicate that in the Finnish educational system, social resources, work demands and workplace commitment are perceived similarly between teachers and school principals. Social support from supervisors and a sense of community were positively associated and role conflicts were negatively associated with workplace commitment. In addition, emotional and cognitive demands, and collegial support were not associated with workplace commitment. No significant interaction effects were identified. Originality/value – This study contributes to the field by offering a nuanced understanding of the different roles that workplace social resources and demands play in emphasizing educators' workplace commitment. The unique setting of two groups involved in the same analysis offers new insights into the social structures of the educational settings.
Test Scopus 2.6.2026 & 3.7.2026 PJK - Ultrasound-enhanced fine-needle aspiration biopsy improves yield of solid benign parotid gland tumor tissue : a pilot study
(Springer Science and Business Media Deutschland GmbH, 2026-12) Naukkarinen, Mira; Le Bourlout, Yohann; Rehell, Minna; Kelppe, Jetta; Nyman, Kristofer; Rautava, Jaana; Ranjan, Sanjeev; Ehnholm, Gösta; Rantanen, Jouni; Pritzker, Kenneth P.H.; Tarkkanen, Jussi; Aro, Katri; Atula, Timo; Nieminen, Heikki J.; Doctoral Programme in Clinical Research; HUS Diagnostic Center; HUS Radiology and Pathology; Department of Diagnostics and Therapeutics; Department of Oral and Maxillofacial Diseases; University of Helsinki; Division of Pharmaceutical Chemistry and Technology; Department of Computer Science; HUS Head and Neck Center; Clinicum; Department of Ophthalmology and Otorhinolaryngology; Doctoral Programme in Materials Research and Nanoscience
Objectives: Fine-needle aspiration biopsy (FNAB) and core-needle biopsy (CNB) are common methods to evaluate the pathology of an abnormal tissue mass. However, both methods have their limitations, e.g., FNAB samples often remain inadequate, and CNB is more invasive. A novel device, ultrasound-enhanced fine-needle aspiration biopsy (USeFNAB), can collect samples with greater cellular content quantitatively without compromising tissue quality. The purpose of this prospective study was to evaluate USeFNAB for the first time in humans in vivo. Materials and methods: This is a pilot study without any deviation from the contemporary management of the salivary gland tumor. Ten adult patients with a solid benign parotid gland tumor diagnosed by FNAB or CNB. Before parotidectomy, the tumors were sampled under ultrasound guidance with three different needle sampling techniques: USeFNAB, FNAB, and CNB. The influence of USeFNAB on the quantity and quality of the samples was investigated and compared with FNAB and CNB. Results: The quality of the cytological slides and histological tissue samples was similar in all samples obtained by USeFNAB, FNAB, and CNB. With USeFNAB, the mass increased on average by 1.6 and 3.4 times and the histological sample area by 1.7 and 3.4 times, as compared to FNAB and CNB, respectively. Conclusion: The results of this study demonstrated that USeFNAB seems to be a feasible and safe biopsy technique under in vivo conditions. In solid benign parotid gland tumors, USeFNAB increases sample yield as compared to conventional needle sampling methods, without affecting sample quality. Relevance statement: USeFNAB could improve the diagnostic accuracy of needle biopsies and facilitate ancillary techniques such as molecular diagnostic studies. Trial registration: Institutional permissions for the study were granted. The USeFNAB protocol went through risk analysis and mitigation for approval by the Finnish Medicine Agency (FIMEA) as an investigational device for research purposes (FIMEA/2023001788). Key Points: USeFNAB showed an improved sample yield in solid benign parotid gland tumors compared to FNAB and CNB, without affecting sample quality. USeFNAB seems to be a feasible and safe biopsy technique. USeFNAB is a promising tool for improving the diagnostic accuracy of needle biopsies.
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(Helsingin yliopisto, 2026-05-26) Humppula, Henkka; Helsingin yliopisto, Humanistinen tiedekunta; University of Helsinki, Faculty of Humanities; Helsingfors universitet, Humanistiska fakulteten
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test 1259 1
(Helsingin yliopisto, 2026-05-26) Humppula, Henkka; Helsingin yliopisto, Humanistinen tiedekunta; University of Helsinki, Faculty of Humanities; Helsingfors universitet, Humanistiska fakulteten
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(Helsingin yliopisto, 2026-05-20) Matlu, Matta; Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta; University of Helsinki, Faculty of Science; Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten
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Formalizing organizational product deletion through strategic cross-functional evaluation : A Bayesian analysis approach
(Elsevier BV, 2023-05-02) Zhu, Qingyun; Dhavale, Dileep G.; Sarkis, Joseph; Wang, Xuan; HUMLOG - The Humanitarian Logistics and Supply Chain Research Institute, Helsinki
Product deletion is a strategic organizational decision. Using multiple literature streams, we identify antecedents and relationships of product deletion across four functional areas—marketing, supply chain, finance, and sustainability. Using a field data sample from eight organizations, we apply Bayesian analysis to identify various relationships between product deletion across various functional performance measures. We complete additional simulation analyses using two dependent variable distribution methods (balanced and unbalanced) and validate using parametric logistic regression methodology for robustness checks. The results show predictive relationships exist amongst the functional performance measures and product deletion. High performance across organizational functions results in decreased odds of product deletion; but not as large a margin as expected. If improved product performance is identified across all functions especially cost dimensions, the likelihood of product deletion decreases. Amongst these functions, surprisingly supply chain performance is a better indicator of a product's candidacy for deletion. The integrative findings are exploratory but provide insights for further research development and practical implementation.