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    • Observations of Acoustic Emission in Power Semiconductors 

      Kärkkäinen, Tommi
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.12.2015)
      Industrial, electrical power generation, and transportation systems, to name but a few, rely heavily on power electronics to control and convert electrical power. Each of these systems, when encountering an unexpected ...

    • Observations on Software Testing Practice 

      Taipale, Ossi
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (26.10.2007)
      This thesis investigates factors that affect software testing practice. The thesis consists of empirical studies, in which the affecting factors were analyzed and interpreted using quantitative and qualitative methods. ...

    • Offdesign operation of kraft recovery boiler 

      Vakkilainen, Esa K.
      LTKK Tieteellisiä julkaisuja - Research Papers (Lappeenranta University of Technology, 01.10.1993)
      A model to solve heat and mass balances during the offdesign load calculations was created. These equations are complex and nonlinear. The main new ideas used in the created offdesign model of a kraft recovery boiler are ...

    • Offshore Sourcing in Software Development: Case Studies of Finnish-Russian Cooperation 

      Kyrki, Anna
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.12.2008)
      The study examines international cooperation in product development in software development organisations. The software industry is known for its global nature and knowledge-intensity, which makes it an interesting setting ...

    • Oil and grease barrier properties of converted dispersion-coated paperboards 

      Ovaska, Sami-Seppo
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 25.11.2016)
      Changes in consumer habits and the replacement of solid trans fats in foodstuffs with unsaturated fats have increased the demand for low-cost grease-resistant packaging materials worldwide. Taking into account the global ...

    • Older consumers adopting information and communication technology: Evaluating opportunities for health care applications 

      Sintonen, Sanna
      Acta Universitatis Lappeenrantaensis (Lappeenranta University Technology, 18.12.2008)
      The purpose of this dissertation is to analyse older consumers' adoption of information and communication technology innovations, assess the effect of aging related characteristic, and evaluate older consumers' willingness ...

    • Omistajuus asiakasomisteisissa osuuskunnissa 

      Jussila, Iiro
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2007)
      Asiakasomisteiset osuuskunnat ovat menestyneet Suomessa erittäin hyvin. Niiden ymmärtäminen yritysmuotona on kuitenkin toistaiseksi perustunut lähinnä muilla kuin liiketaloustieteen oppialoilla tehdyille tutkimuksille. ...

    • On adaptive intelligent welding: technique feasibility in weld quality assurance for advanced steels 

      Gyasi, Emmanuel Afrane
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 28.08.2018)
      The welding industry has a need to utilize lightweight steels in welded applications while maintaining acceptable weld quality. This goal can be achieved through effective quality assurance, efficient weld parameter ...

    • On antecedents of organizational innovation: how the organizational learning, age and size of a firm impact its organizational innovation 

      Dukeov, Igor
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.03.2022)
      The main goal of this thesis is to increase the understanding of how a company can improve its organizational innovation performance. Organizational innovation in this thesis means innovation in management practices, ...

    • On convergence of transforms based on parabolic scaling 

      Sampo, Jouni
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 21.12.2010)
      This thesis studies properties of transforms based on parabolic scaling, like Curvelet-, Contourlet-, Shearlet- and Hart-Smith-transform. Essentially, two di erent questions are considered: How these transforms can ...

    • On dissimilar welding: a new approach for enhanced decision-making 

      Tasalloti Kashani, Hamed
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 07.07.2017)
      Demand for dissimilar welding has shown continuous growth in a wide variety of industrial fields, including power generation, petrochemical plants, oil and gas exploration, transportation and aerospace manufacturing. ...

    • On Effort Estimation in Software Projects 

      Vesterinen, Petri
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2000)
      Software engineering is criticized as not being engineering or 'well-developed' science at all. Software engineers seem not to know exactly how long their projects will last, what they will cost, and will the software work ...

    • On Innovative Search: the use of internal and external sources of innovation among Finnish innovators 

      Paananen, Mikko
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 14.12.2012)
      This dissertation explores the use of internal and external sources of knowledge in modern innovation processes. It builds on a framework that combines theories such as a behavioural theory of the firm, the evolutionary ...

    • On Load Modeling of Electric Vehicles—Energy System Viewpoints 

      Tikka, Ville
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 12.01.2024)
      Customer load modeling is a fundamental component of many business practices in the energy industry, particularly in the electricity distribution and retail sectors. The increasing numbers of electric vehicles (EVs) and ...

    • On Modelling, System Identification and Control of Servo-Systems with a Flexible Load 

      Yousefi, Hassan
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (16.06.2007)
      The present study was done with two different servo-systems. In the first system, a servo-hydraulic system was identified and then controlled by a fuzzy gainscheduling controller. The second servo-system, an electro-magnetic ...

    • On numerical implementation of α-stable priors in Bayesian inversion 

      Suuronen, Jarkko
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 08.12.2023)
      In this thesis, we introduce numerical approximations of Levy α-stable random field priors for Bayesian inversion. The α-stable processes are well-studied in stochastic process literature, and they can be potentially ...

    • On sliding mode control ofhydraulic servo systems and a manipulator 

      Liu, Yong
      Acta Universitatis LappeenrantaensisURN:ISSN:1456-4491 (2002)
      The aim of the study is to developa novel robust controller based on sliding mode control technique for the hydraulic servo system with flexible load and for a flexible manipulator with the lift and jib hydraulic actuators. ...

    • On state and parameter estimation in chaotic systems 

      Hakkarainen, Janne
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 22.11.2013)
      State-of-the-art predictions of atmospheric states rely on large-scale numerical models of chaotic systems. This dissertation studies numerical methods for state and parameter estimation in such systems. The motivation ...

    • On Sustainable Rural Electrification in Africa: Design of a Self-Sufficient Micro Off-Grid System 

      Demidov, Iurii
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 17.06.2024)
      Less than 50% of the population in sub-Saharan Africa (SSA) has electricity access. Considering rural areas in SSA, electricity is available only to 16% of the local people. In addition, there are over three and half billion ...

    • On the Analysis and Control of a Linear Synchronous Servomotor with a Flexible Load 

      Hirvonen, Markus
      Acta Universitatis Lappeenrantaensis (08.12.2006)
      Industry's growing need for higher productivity is placing new demands on mechanisms connected with electrical motors, because these can easily lead to vibration problems due to fast dynamics. Furthermore, the nonlinear ...