Julkaisuarkisto
Viimeksi lisätyt
- Ladataan...Conceptual fragmentation in marketing science: insights from the value co-creation literatureMakkonen, Hannu; Aspara, Jaakko; Kaartemo, Valtteri; Mäntymäki, Matti; Paavilainen-Mäntymäki, Eriikka (Emerald)
The concept of value co-creation occupies a central role in marketing and service research, yet its usage has often been fragmented and inconsistent. This study aims to examine value co-creation as a case of conceptual fragmentation, offering a large-scale reassessment of its conceptual development.
Design/methodology/approach
Analyzing 2,960 articles published between 2004 and 2019, the authors conduct an integrative literature review and statistical analysis. The authors introduce analytical comprehensiveness (AC) as a systematic measure to evaluate how thoroughly the foundational dimensions of value co-creation – value proposition and value-in-use – are engaged.
Findings
The longitudinal analysis reveals both intuitive and counterintuitive patterns. While integration has generally increased, trajectories differ across article positioning, journal types and rankings. These findings indicate that integration is not simply a function of time but reflects mechanisms of scholarly learning, diffusion and institutionalization.
Research limitations/implications
To the best of the authors’ knowledge, this is the first quantified, large-scale review of value co-creation, clarifying its foundational dimensions and advancing conceptual fragmentation as an actionable research construct. It opens pathways for future work on conceptual stewardship and cumulative knowledge building.
Practical implications
This study enhances practical understanding by refining value co-creation into actionable dimensions – value proposition and value-in-use – that can guide managerial application.
Originality/value
This paper contributes by elaborating conceptual fragmentation as a central phenomenon in marketing, introducing AC as a replicable measure, showing its contingency on structural contexts and refining value co-creation’s conceptual core through the first large-scale empirical analysis of its fragmentation dynamics.
- Ladataan...Shortest paths in planar domains with hyperbolic type metricsGao, Shuliang; Hakanen, Anni; Rasila, Antti; Vuorinen, Matti (Elsevier BV)We study planar domains G equipped with a hyperbolic type metric and approximate geodesics that join two points x,y∈G and their lengths. We present an algorithm that enables one to approximate the shortest distance in polygonal domains taken with respect to the quasihyperbolic metric. The method is based on Dijkstra's algorithm, and we give several examples demonstrating how the algorithm works and analyze its accuracy. We experimentally demonstrate several previously theoretically observed features of geodesics, such as the relationship between hyperbolic and quasihyperbolic distance in the unit disk. We also investigate bifurcation of geodesics and the connection of this phenomenon to the medial axis of the domain.
- Ladataan...Co-creation or consultation? The role of community engagement in public urban innovation processes in HelsinkiKeinonen, Ella; Hooli, Lauri (Informa UK Limited)
Public innovation intermediaries strive to play a key role in translating participatory ideals into urban innovation practice. This article examines how such intermediaries shape community participation within open innovation projects, focusing on Forum Virium Helsinki (FVH), an actor in Helsinki's smart city ecosystem. Drawing on participatory urban planning and public innovation intermediation, the study assesses whether community participation yields meaningful co-creation or remains largely procedural. The analysis draws on FVH's project library (199 projects), from which seven were selected for in-depth qualitative study, combining document analysis with ten stakeholder interviews. A process-oriented framework compares engagement practices across project stages. Findings show a recurring pattern: while ideation and implementation feature visible engagement - surveys, workshops and test-user activities - participation during design and evaluation is limited and often symbolic. This reveals a gap between the rhetoric of co-creation and its practical realization. The study concludes that intermediaries like FVH both enable and constrain participatory governance. Although they facilitate experimentation and collaboration, institutional and project-based constraints restrict transformative participation. Embedding participatory innovation in ongoing governance is essential for inclusive, sustained community engagement.
- Ladataan...Long-term study of the gamma-ray emission of Cygnus X-3 with MAGIC and Fermi–LATAbe, K.; Abe, S.; Abhir, J.; Abhishek, A.; Acciari, V.A.; Aguasca-Cabot, A.; Agudo, I.; Albanese, I.; Aniello, T.; Ansoldi, S.; Antonelli, L.A.; Arbet Engels, A.; Arcaro, C.; Arnesen, T.T.H.; Babić, A.; Bakshi, C.; Barres de Almeida, U.; Barrio, J.A.; Barrios-Jiménez, L.; Batković, I.; Baxter, J.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Bernete, J.; Berti, A.; Besenrieder, J.; Bigongiari, C.; Biland, A.; Blanch, O.; Bonnoli, G.; Bordas, P.; Bošnjak, Ž.; Bronzini, E.; Burelli, I.; Campa, C.; Campoy-Ordaz, A.; Carosi, A.; Carosi, R.; Carretero-Castrillo, M.; Castro-Tirado, A.J.; Cerasole, D.; Ceribella, G.; Cerviño, A.; Chilingarian, A.; Chon, G.; Cifuentes Santos, A.; Contreras, J.L.; Cortina, J.; Covino, S.; D’Amico, G.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Lotto, B.; Delfino, M.; Delgado, J.; Di Pierro, F.; Di Tria, R.; Di Venere, L.; Dinesh, A.; Dominis Prester, D.; Donini, A.; Dorner, D.; Doro, M.; Eisenberger, L.; Elsaesser, D.; Foffano, L.; Font, L.; Frías García-Lago, F.; Fröse, S.; Fukazawa, Y.; García Soto, S.; Gaug, M.; Giesbrecht Paiva, J.G.; Giglietto, N.; Giordano, F.; Gliwny, P.; Godinović, N.; Gradetzke, T.; Grau, R.; Green, J.G.; Günther, P.; Hadasch, D.; Hahn, A.; Harutyunyan, G.; Hassan, T.; Herrera Llorente, J.; Hrupec, D.; Israyelyan, D.; Jahanvi, J.; Jiménez Martínez, I.; Jiménez Quiles, J.; Kankkunen, S.; Konrad, J.; Kouch, P.M.; Kubo, H.; Kushida, J.; Láinez, M.; Lamastra, A.; Lindfors, E.; Lombardi, S.; Longo, F.; López-Coto, R.; López-Moya, M.; López-Oramas, A.; Loporchio, S.; Lulić, L.; Lyard, E.; Majumdar, P.; Makariev, M.; Maneva, G.; Manganaro, M.; Mangano, S.; Mariotti, M.; Martínez, M.; Maruševec, P.; Mazin, D.; Menchiari, S.; Méndez Gallego, J.; Menon, S.; Miceli, D.; Miranda, J.M.; Mirzoyan, R.; Molero González, M.; Molina, E.; Mondal, H.A.; Moralejo, A.; Nanci, C.; Negro, A.; Neustroev, V.; Nievas Rosillo, M.; Nigro, C.; Nikolić, L.; Nozaki, S.; Okumura, A.; Otero-Santos, J.; Paiano, S.; Paneque, D.; Paoletti, R.; Paredes, J.M.; Peresano, M.; Persic, M.; Pihet, M.; Podobnik, F.; Prada Moroni, P.G.; Prandini, E.; Rhode, W.; Ribó, M.; Rico, J.; Roy, A.; Sahakyan, N.; Saturni, F.G.; Schiavone, F.; Schmitz, K.; Schweizer, T.; Sciaccaluga, A.; Silvestri, G.; Simongini, A.; Sitarek, J.; Sobczynska, D.; Stamerra, A.; Strišković, J.; Strom, D.; Strzys, M.; Suda, Y.; Takeishi, R.; Tartera Barberà, J.; Temnikov, P.; Terzić, T.; Teshima, M.; Tutone, A.; Ubach, S.; Vazquez Acosta, M.; Ventura, S.; Verna, G.; Viale, I.; Vigliano, A.; Vigorito, C.F.; Visentin, E.; Vitale, V.; Vorbrugg, M.; Vovk, I.; Walter, R.; Walther, C.; Wersig, F.; Yeung, P.K.H.; Bosch-Ramon, V. (Elsevier BV)Cygnus X-3 is a microquasar composed of a compact object of unknown nature closely orbiting around a Wolf-Rayet star. The particularities of this source make it a unique case among microquasars. This fact, together with its recent establishment as a PeV particle accelerator, makes Cygnus X-3 a very interesting target for the investigation of the physical processes leading to gamma-ray production. In this work, the TeV and GeV gamma-ray emission of Cygnus X-3 is studied in order to determine its origin and constrain the properties of the system. For that purpose, a point-like analysis of 130 h of data taken with the MAGIC telescopes between 2013 and 2024 was performed, which represents the largest available sample for Cygnus X-3 at ∼ TeV energies. Additionally, contemporary data from Fermi –LAT were also analysed to better contextualize the MAGIC observations. For a more detailed investigation of the source physics, the data were divided into three subsets according to the flaring state of the source and orbital phase. No significant detection of Cygnus X-3 is found between 0.1 and 7 TeV for any of the datasets, and differential and integral flux upper limits are reported over the long-term monitoring of the source. The Fermi –LAT fluxes can be considered compatible with previous results, taking into account the different data samples used across studies. The MAGIC upper limits presented in this work represent the most constraining ones up to date at ∼ TeV energies. An eventual detection of Cygnus X-3 at these energies would significantly constrain the source properties, and is not unreasonable to expect given that the source has already been detected in both the GeV and PeV regimes during flaring states. Further observations of Cygnus X-3 at energies above tens of GeV would be valuable for this purpose.
- Ladataan...Connecting the long-term variability behaviour of active galactic nuclei to their central enginesKankkunen, S.; Tornikoski, M.; Hovatta, T. (EDP Sciences)
Aims. Analysing the long-term radio variability of active galactic nuclei (AGNs) is essential to understanding the physics of relativistic jets launched by supermassive black holes. We aim to connect the characteristic timescales obtained from a prior power spectral density (PSD) analysis to the decomposed timescales of the light curves. In addition, we probe for potential associations between the timescales and the physical characteristics of the relativistic jet as well as the central engine.
Methods. We decomposed the long-term radio light curves of 54 sources observed at the Aalto University Metsähovi Radio Observatory into individual flares to understand which timescale of variability is related to the low-frequency bend in the PSD. In addition, we used the obtained rise times of the brightest flares to look for associations between the emission-region size in the jet and different central engine parameters.
Results. We found that the inverse of the PSD bend frequency of radio light curves best corresponds to the mean duration of the brightest flares. For some sources, the mean flare separation had a similar timescale. Using the flare durations and separations as proxies for the PSD timescale, we found a positive correlation with black hole mass divided by the normalised mass accretion rate. This suggests that the variability timescales obtained from the PSDs of radio light curves are associated with the central engine. Furthermore, when comparing the obtained rise times of the brightest flares to the jet and central engine parameters, we found weak tentative correlations, but they may be driven by a common dependency on redshift.