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- Foroughi, Behzad, et al.
(author)
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Reuse intention of augmented reality apps : recreational consciousness as moderator
- 2023
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In: Service Industries Journal. - : Routledge. - 0264-2069 .- 1743-9507. ; , s. 1-42
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Journal article (peer-reviewed)abstract
- This study investigated the determinants of intention to reuse augmented reality (AR) apps. The data were obtained from 439 IKEA Place app users and evaluated using the ‘partial least squares’ (PLS) and ‘fuzzy-set qualitative comparative analysis’ (fsQCA) approaches. PLS findings revealed that AR attributes significantly influence perceived ease of use, perceived usefulness, and confirmation. All the relationships under the technology continuance theory were confirmed except for the impact of perceived usefulness on attitude. Recreational consciousness positively moderates the influence of attitude on reuse intentions. fsQCA approach uncovered seven configurations of variables that result in high reuse intentions and identified satisfaction as a necessary condition. The study contributed to the literature by (i) exploring the drivers of intention to reuse AR Apps, (ii) extending technology continuance theory, (iii) demonstrating the moderating influence of recreational consciousness, and (iv) using the PLS-fsQCA approach. The findings help develop strategies and design AR apps aimed at retaining users.
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- Nagarakanti, Rangadham, et al.
(author)
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Comparison of Characteristics and Outcomes of Dabigatran Versus Warfarin in Hypertensive Patients With Atrial Fibrillation (from the RE-LY Trial)
- 2015
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In: American Journal of Cardiology. - : Elsevier BV. - 0002-9149 .- 1879-1913. ; 116:8, s. 1204-1209
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Journal article (peer-reviewed)abstract
- Hypertension is frequent in patients with atrial fibrillation (AF) and is an independent risk factor for stroke. The Randomized Evaluation of Long Term Anticoagulant TherapY (RE-LY) trial found dabigatran 110 mg (D110) and 150 mg twice daily (D150) noninferior or superior to warfarin for stroke reduction in patients with AF, with either a reduction (D110) or similar rates (D150) of major bleeding. Baseline characteristics and outcomes were compared in patients with and without hypertension. The quality of blood pressure control was also assessed. In RE-LY, 14,283 patients (78.9%) had hypertension. The mean blood pressure at baseline was 132.6 +/- 17.6/77.7 +/- 10.6 and 124.8 +/- 16.7/74.6 +/- 10.0 mm Hg for patients with and without hypertension, respectively. More patients with hypertension were diabetic (25.6% vs 14.8%, p <0.001), women (38.6% vs 28.3%, p <0.001), and had greater CHADS(2) (2.3 vs 1.4, p <0.001) and CHA(2)DS(2)-VASc scores (3.8 vs 2.8, p <0.001). Mean blood pressure in all treatment arms in hypertensive patients was similar (130 +/- 18/76 +/- 11 mm Hg) during the trial. The efficacy and safety of D110 and D150 compared to warfarin were similar (p = nonsignificant) in hypertensive (stroke/systemic embolism rate of 1.47%, 1.20%, and 1.81% and major bleed rate of 2.89%, 3.70%, and 3.69% in the D110, D150, and W, respectively) and normotensive patients (stroke/systemic embolism rate of 1.79%, 0.78%, and 1.36% and major bleed rate of 2.84%, 2.37%, and 3.03% per year in the D110, D150, and W, respectively). Hypertensive patients had more major bleeds (3.39% vs. 2.76%; p = 0.007). Intracranial bleeds were similar (0.47% vs 0.31%; p = 0.12). In conclusion, patients with hypertension in RE-LY were more likely female, diabetic, with a greater CHADS(2) and CHA(2)DS(2)-VASc scores. Blood pressure control in RE-LY was excellent. The benefits of dabigatran over warfarin, including a substantial reduction of intracranial hemorrhage, were similar in both hypertensive and non-hypertensive patients.
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| 4. |
- Vorobyev, Y., et al.
(author)
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Development and Application of a Genetic Algorithm Based Dynamic PRA Methodology to Plant Vulnerability Search
- 2011
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In: International Topical Meeting on Probabilistic Safety Assessment and Analysis 2011, PSA 2011. - 9781617828478 ; , s. 559-573
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Conference paper (peer-reviewed)abstract
- The paper describes recent achievements in development and application of the Dynamic Probabilistic Risk Analysis (DPRA) methodology based on the Genetic Algorithm (GA). The aim of the GA-DPRA approach is to enable identification of safety vulnerabilities and quantification of accident risks related to operation of nuclear power plants (NPP). The approach combines a system code as a deterministic model of the plant and a GA search engine for the exploration of the plant scenarios space. A point in this space represents a scenario (transient) which is defined by unique combination of initial plant state and time dependent sequence of changes in the plant state parameters implemented in the system code input. The GA-DPRA is used to address two main types of safety analysis problems: (i) identification of a "worst case" scenario with most severe violation of safety limits (failure of safety barriers); (ii) identification of "failure domains" (subdomains in the space of plant scenarios where at least one of the safety limits (barriers) is violated). Safety critical parameters (safety limits) are used by GA as fitness functions to guide selection of the system code input parameters in process of the global optimum search. The GA controls selection of system code input parameters within predefined diapasons and time windows. Unlike "brute force" approaches or Monte Carlo type methods the GA-DPRA is much less demanding to computational resources due to intelligent and adaptive resolution in the exploration of the plant scenarios space. Stochastic properties of GA and Importance Sampling technique are applied to estimate probabilistic characteristics of the identified vulnerabilities. Solutions of benchmark problems and comparison with other methods are discussed in the paper.
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| 8. |
- Moiseeva, Ekaterina, et al.
(author)
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Tacit Collusion with Imperfect Information : Ex-Ante Detection
- 2014
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Conference paper (peer-reviewed)abstract
- The liberalization of electricity markets had a significant impact on the whole process of optimal dispatch. The positive effect of competition is partly canceled out by profit-maximizing behavior of market participants. Strategic generators can exercise market power or collude tacitly with other participants to ensure higher electricity price and therefore higher profits. In this paper we study the generators' possibility to come to a tacit collusion by distributed computations. Due to the strategic nature of market interactions, the information corresponding to the power production by generating companies is often fully confidential outside the generating unit. Such information includes the data about planned and emergency outages, capacity constraints, ramping rates specific to the units, probability of failures, etc. Under certain assumptions the constraint set of a generating unit can be represented as a convex set. Using a novel multi-agent distributed constrained optimization algorithm we show how market participants with confidential constraint sets can reach the collusion on the production share, while maximizing their own profit. We compare this outcome to the outcome of Nash equilibrium over specified time horizon and conclude, if both generators find it profitable to collude. This modeling is important for early detection and prevention of tacit collusion.
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| 9. |
- Stambulova, Natalia, 1952-
(author)
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Russian/Soviet sport psychology developments as a part of sport psychology history
- 2019
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In: Abstract book. ; , s. 300-300
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Conference paper (peer-reviewed)abstract
- Russian sport psychology history covers a bit over a century including the pre-Soviet, the Soviet, and the post-Soviet macro-periods divided by formation of the Soviet Union in 1922, and its disintegration in 1991. In the context of this symposium focusing on the Soviet period is the most relevant. Based on several publications on history and contributions of Russian/Soviet sport psychology (Ryba & Stambulova, 2016; Ryba, Stambulova, & Wrisberg, 2005; 2009; Stambulova, Wrisberg, & Ryba, 2006; Stambulova, 1999; Stambulova, Stambulov, & Johnson, 2012) and my lived historical knowledge from three-decade professional career in the Soviet Union/Russia, I am going to elaborate on: (1) specific context for development of the Soviet sport psychology (closed and centralized country driven by the communist ideology, politicized elite sport, state support to sport and sport sciences), (2) major organizational developments (national sport psychology forums and organizations, “complex scientific groups” serving national teams, collaboration and leadership within socialist block countries, ensuring representation in FEPSAC and ISSP), and (3) original and culturally infused sport psychology frameworks for research and applied work: volitional preparation in sport (Puni, 1973), psychological preparation for a competition (Puni, 1969), psychological support system for elite athletes (Gorbunov, 1986), and psychological control system (Kiselev, 1989). These frameworks can be seen as “a prologue” to development of several contemporary sport psychology topics (e.g., mental toughness, resilience, and adversity training, competition planning and self-regulation, athletes’ assessment/monitoring systems), and Soviet leadership in applied work (in the 1970s-1980s) served as “a wake-up call” for sport psychologists in Western countries.
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| 10. |
- Wang, Gan, et al.
(author)
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Nanoalignment by critical Casimir torques
- 2024
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In: Nature Communications. - 2041-1723 .- 2041-1723. ; 15:1
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Journal article (peer-reviewed)abstract
- The manipulation of microscopic objects requires precise and controllable forces and torques. Recent advances have led to the use of critical Casimir forces as a powerful tool, which can be finely tuned through the temperature of the environment and the chemical properties of the involved objects. For example, these forces have been used to self-organize ensembles of particles and to counteract stiction caused by Casimir-Liftshitz forces. However, until now, the potential of critical Casimir torques has been largely unexplored. Here, we demonstrate that critical Casimir torques can efficiently control the alignment of microscopic objects on nanopatterned substrates. We show experimentally and corroborate with theoretical calculations and Monte Carlo simulations that circular patterns on a substrate can stabilize the position and orientation of microscopic disks. By making the patterns elliptical, such microdisks can be subject to a torque which flips them upright while simultaneously allowing for more accurate control of the microdisk position. More complex patterns can selectively trap 2D-chiral particles and generate particle motion similar to non-equilibrium Brownian ratchets. These findings provide new opportunities for nanotechnological applications requiring precise positioning and orientation of microscopic objects.
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