Search results for "vakaus"
showing 6 items of 6 documents
The gait is less stable in children with cerebral palsy in normal and dual-task gait compared to typically developed peers
2021
There is limited evidence about gait stability and its alteration by concurrent motor and cognitive tasks in children with cerebral palsy (CP). We examined gait stability and how it is altered by constrained cognitive or motor task in CP and their typically developed (TD) controls. Gait kinematics were recorded using inertial-measurement units (IMU) from 18 patients with hemiplegia (13.5 +/- 2.4 years), 12 with diplegia (13.0 +/- 2.1 years), and 31 TD controls (13.5 +/- 2.2 years) during unconstrained gait, and motor (carrying a tray) and cognitive (word naming) task constrained gait at preferred speed (similar to 400 steps/task). Step duration, its standard deviation and refined-compound-m…
Stability of solution for Rao-Nakra sandwich beam model with Kelvin-Voigt damping and time delay
2022
This paper deals with stability of solution for a one-dimensional model of Rao?Nakra sandwich beam with Kelvin?Voigt damping and time delay given by ??1?1?????? ? ??1?1?????? ? ??(??? + ?? + ??????) ? ?????????? ? ??????????( ? , ?? ? ??) = 0, ??3?3?????? ? ??3?3?????? + ??(??? + ?? + ??????) ? ?????????? = 0, ????????? + ?????????????? ? ????(??? + ?? + ??????)?? ? ?????????? = 0. A sandwich beam is an engineering model that consists of three layers: two stiff outer layers, bottom and top faces, and a more compliant inner layer called ?core layer?. Rao?Nakra system consists of three layers and the assumption is that there is no slip at the interface between contacts. The top and bottom lay…
Higher education graduates' employment and the uncertainty of working life.
2012
The aim of this chapter is to examine how the uncertainty and instability of working life is reflected in Finnish polytechnic graduates’ employment. The present study investigates the fields of business and engineering by comparing two graduate cohorts. The societal context in which new graduates enter working life is that of an increasing precariousness in the labour market, which affects higher education graduates as well as the general population. Nowadays, a higher education qualification is not necessarily a guaranteed path to a high income and high social status as it used to be. Insecurity and uncertainty in society and working life can be considered as general features of late moder…
On stochastic modelling and reliability of systems with moving cracked material
2015
In many industrial processes, such as printing paper, a material travels through a series of rollers unsupported and under longitudinal tension. The value of the tension has an important role in the system behaviour, such as fracture and me- chanical stability. This thesis develops stochastic models for a system in which an elastic, isotropic cracked material travels through a series of spans and studies the probabilities of fracture and instability of the material. The models focus on describing tension variations and initial cracks in the material. Time-dependent tension fluctuations are modelled by the stationary Ornstein-Uhlenbeck process, and the occurrence and lengths of the cracks are…
Added-Mass Based Efficient Fluid–Structure Interaction Model for Dynamics of Axially Moving Panels with Thermal Expansion
2020
The paper considers the analysis of a traveling panel, submerged in axially flowing fluid. In order to accurately model the dynamics and stability of a lightweight moving material, the interaction between the material and the surrounding air must be taken into account. The lightweight material leads to the inertial contribution of the surrounding air to the acceleration of the panel becoming significant. This formulation is novel and the case complements our previous studies on the field. The approach described in this paper allows for an efficient semi-analytical solution, where the reaction pressure of the fluid flow is analytically represented by an added-mass model in terms of the panel…
Asuntomarkkinoiden hintamuutoksien vaikutus talouden kehittymiseen
2017
Tässä pro gradu -tutkielmassa tutkitaan asuntomarkkinoiden hintamuutoksien vaikutuksia talouden kehittymiseen. Asuntomarkkinoiden asema taloudessa on merkittävä niin kansallisella kuin kansainväliselläkin tasolla. Asuntomarkkinat ovat olleet kehittyneissä talouksissa turbulenssia aiheuttava tekijä ja tämän vuoksi hyvin kattavasti tutkittu talouden osa-alue. Työssä esitellään laaja-alaisesti asuntomarkkinoihin liittyvää aikaisempaa tutkimusta, jonka avulla päästään aihepiiriin sisälle. Aikaisemman tutkimuksen rinnalle tehdään empiirinen mallintaminen Suomen ja Ruotsin makrotason muuttujilla. Muuttujien avulla mallinnetaan asuntohintojen ja BKT:n välistä vuorovaikutusta ja ennustevoimaa vuode…