[article] Insinööritieteiden korkeakoulu / ENG

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Browsing [article] Insinööritieteiden korkeakoulu / ENG by Issue Date

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  • A hip wear simulator with 100 test stations
    (2005) Saikko, Vesa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • A12-station anatomic hip joint simulator
    (2005) Saikko, Vesa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Environmental human-friendliness as a contextual determinant for quality of life
    (2006) Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The aim of the article is to define some criteria of human-friendly environments and to explain why the concept of environmental human-friendliness (EHF) is important in the analysis and improvement of the quality of people´s lives. EHF is a complex multi-dimensional and multi-level concept that refers to environments or settings which provide support to individuals and different groups so that they can implement their goals or projects, with a potential impact on the subjective well-being. EHF can be described and assessed by an individual criterion (per-son-environment fit) and a group criterion (collective environment fit). A heuristic model of the conditions for EHF is presented that can be applied in the analysis of the context of well-being and in the envisioning phase of the improvement of conditions for the quality of life.
  • Effect of contact pressure on wear and friction of ultra-high molecular weight polyethylene in multidirectional sliding
    (2006) Saikko, Vesa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • ‘Healing’ and ‘repairing’ techniques for faster optimization with genetic algorithm
    (2009) Jelovica, Jasmin; Klanac, Alan
     School of Engineering | A4 Artikkeli konferenssijulkaisussa
    This paper presents two techniques, the ‘healing’ and ‘repairing’ that can reduce optimization time when using genetic algorithm for structural optimization. The techniques can be applied to: (a) quickly find feasible designs from completely infeasible set of alternatives, and (b) to make the best infeasible designs feasible. These procedures are implemented into a genetic algorithm ‘VOP’. The performance of the original and the modified version of the algorithm are compared with the widespread genetic algorithm ‘NSGA-II’ for the weight optimization of a 40 000 DWT chemical tanker midship section. The results show that these procedures can decrease the optimization time by approximately half.
  • Network Evaluation from the Everyday Life Perspective : A Tool for Capacity-Building and Voice
    (2009) Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Despite the rich literature on networks, publications on the evaluation of networks are scarce. The aim of the article is to present the core concepts of network evaluation in the context of local and regional development, and a case study in Finnish North-Karelia. It is argued that network evaluation from the everyday life perspective (NEELP) is a special case. It requires an integrative design and the building of a collective monitoring and self-evaluation system with a variety of enabling and traditional assessment tools. It contributes to the empowerment and capacity building of individuals and groups of people who are involved in the co-creation of their contexts, while it also strives to recognize the complex systemic aspects of the environment. Horelli, Liisa (2009) Network Evaluation from the Everyday Life Perspective. A Tool for Capacity-Building and Voice. Evaluation, 15(2), 205-223.
  • Selection of the organisation mode for international property investments
    (2010) Falkenbach, Heidi
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Purpose: This paper aims to identify different organisation modes for international property investments and analyse the rationales for selecting each mode. Design/methodology/approach: The paper reports the findings of an interview study conducted among international investors in the Finnish property market. Findings: The study identifies four main organisation modes for international property investments, the selection of each mode being dependent of the investors’ perception of the informational barriers and local nature of the property market. Most of the interviewed investors also apply the same strategy in other markets they invest in, and thus the selection of the organisation mode seems not to be very dependent on the characteristics of the investment market.Research limitations/implications: The paper analyses the organisation modes and their selection criteria only in the Finnish market. Practical implications: The study indicates that informational barriers are still of major concern for the investors entering foreign markets. Thus, activities contributing to lowering these barriers would be beneficial for those markets wanting to attract international property investments. Originality/value: The study is the first to analyse the organisation modes of international property investors.
  • The methodology of user-sensitive service design within urban planning
    (2010) Wallin, Sirkku; Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The increasingly complex living environment poses challenges in everyday life that thetraditional urban planning cannot meet. We argue that the methodology, called the user-sensitiveservice design within urban planning, is viable for many stakeholders in a situation,where the infrastructure of everyday life is shattering and the uncertainty and ambiguity of theplanning process and outcomes are prevailing (Forester 1993). Our aim is to present themethodology and its application in the planning and development of digitised services in aneighbourhood of Helsinki. The methodology turns out to be a hybridiser and a bridge builderthat embeds urban planning in the local context. In addition, it is a vehicle for transfering theplanning content to the phases of implementation and use, resulting in the emergence ofglocal digital spaces.
  • Wear comparison between a dual mobility total hip prosthesis and a typical modular design using a hip joint simulator
    (2010) Saikko, Vesa; Shen, Ming
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Pricing models of covered bonds—a Nordic study
    (2011) Sulku, Petri; Falkenbach, Heidi
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Covered bonds are an alternative way of investing indirectly in the debt side of real estate, which is beneficial for investors looking for alternatives to government or corporate bonds. Due to the dual nature of the protection offered by covered bonds, they have a justified place in investors' portfolios. This paper studies the pricing of covered bonds and tests it with data gathered from the nordic countries. Using the tested reduced form model, it was possible to price covered bonds with satisfactory results. The estimated model was highly statistically significant and performed according to the economic reasoning behind it. The estimated model also worked well in comparison to research conducted earlier on competing models, such as the structural models.
  • RandomPOD - A new method and device for advanced wear simulation of orthopaedic
    (2011) Saikko, Vesa; Kostamo, Jari
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Polymer cover induced self-excited vibrations of nipped rolls
    (2011) Karttunen, Anssi T.; von Hertzen, Raimo
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Exploring E-Planning Practices in Different Contexts
    (2012) Wallin, Sirkku; Saad-Sulonen, Joanna; Amati, Marco; Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    As planners and decision-makers experiment with information and communication technologies (ICTs),it’s important to explore and analyze these attempts in different planning systems and contexts. The aim of the article is to compare the use of and aspirations attached to e-planning in Helsinki, Finland and Sydney,Australia. This comparison will highlight the interrelationship between planning context and its amenability to an e-planning approach and shows there are shared themes in both cases: firstly, the complexity involved in reconciling the aims of the e-planning experiments and their connection to the planning process itself (roles,objectives, implementation of tools and processes). Secondly, the way that e-planning opens up cracks in the façade of administration, and thirdly, the ways in which e-planning provides possibilities to reshape existing planning procedures. The authors argue that the different planning and governance contexts affect the adoption of e-planning and this adoption is necessarily a selective process.
  • Fault detection in a centrifugal pump using vibration and motor current signature analysis
    (2012) Kumar Pradhan, Prasanta; Ranjan Mohanty, Amiya; Nitaigour P, Mahalik; Ghosh Dastidar, Sabyasachi
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Due to growth of mechanisation and automation, today’s industrial systems are becoming more complex. A small breakdown of any non-redundant machine component affects the operation of the entire system. To increase the availability and reliability, automated health monitoring and self-diagnostic capability (SDC) becoming essential to many industrial machineries like pumps, motors, etc. Condition monitoring does not prevent the failure, but it can predict the possibility of future failure by measuring certain machine parameters. Though there are various condition monitoring techniques, vibration analysis and motor current signature analysis (MCSA) are most suitable for detection of faults and abnormalities in machine systems. This work attempts to develop an SDC framework and diagnose the impeller condition of a centrifugal pump using MCSA. Time and frequency domain analyses are done for different impeller conditions of the pump, such as normal impeller and defective impellers. Significant differences are observed and a fault prediction strategy is recommended.
  • Design for gender equality - the history of cohousing ideas and realities
    (2012) Vestbro, Dick Urban; Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Today’s development of alternative types of housing with communal spaces and shared facilities, called cohousing, has been influenced by utopian visions, practical proposals and implemented pro-jects far back in the past. This article traces the driving forces behind the various models of communitarian settlements, cooperative housekeeping, central kitchen buildings, collective housing and collaborative residential experiments while focusing specifically on the design and gender aspects of these models. An emphasis is given to feminist arguments for cohousing, as well as a discussion of the patriarchal resistance against various forms of housing and living based on equality and neighbourly cooperation. The article includes an analysis of the relief of house work burdens and of the possibility for men to be courageously domesticated through this type of housing. The main research methods comprise analyses of literature and the researchers’ own practical experiences of cohousing. The authors claim that cohousing in Scandinavian and some other countries has contributed to a more equal distribution of responsibilities for house work. However, the number of people living in cohousing is still too small to influence the gender segregation of labour markets. It is furthermore concluded that design factors, such as the quality of shared spaces, easy access to common rooms and indoor communication, are important for the smooth functioning of cohousing.
  • Influence of weld stiffness on buckling strength of laser-welded web-core sandwich plates
    (2012) Jelovica, Jasmin; Romanoff, Jani; Ehlers, Sören; Varsta, Petri
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This paper investigates the influence of weld rotation stiffness on the global bifurcation buckling strength of laser-welded web-core sandwich plates. The study is carried out using two methods, the first is the equivalent single-layer theory approach solved analytically for simply supported plates and numerically for clamped plates. First-order shear deformation theory is used. The second method is the three-dimensional model of a sandwich plate solved with finite element method. Both approaches consider the weld through its rotation stiffness. The weld rotation stiffness affects the transverse shear stiffness. Plates are loaded in the web plate direction. Four different cross-sections are considered. Weld stiffness is taken from experimental results presented in the literature. The results show a maximum of 24% decrease in buckling strength. The strength was affected more in plates with high reduction of transverse shear stiffness and high bending stiffness. Furthermore, clamped plates were influenced more than simply supported. The intersection between buckling modes shifted towards higher aspect ratios, in the maximum case by 24%. The results show the importance of considering the deforming weld in buckling analysis.
  • Collective dynamics of pedestrians interacting with attractions
    (2013) Kwak, Jaeyoung; Jo, Hang-Hyun; Luttinen, Tapio; Kosonen, Iisakki
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    In order to investigate collective effects of interactions between pedestrians and attractions, this study extends the social force model. Such interactions lead pedestrians to form stable clusters around attractions, or even to rush into attractions if the interaction becomes stronger. It is also found that for high pedestrian density and intermediate interaction strength, some pedestrians rush into attractions while others move to neighboring attractions. These collective patterns of pedestrian movements or phases and transitions between them are systematically presented in a phase diagram. The results suggest that safe and efficient use of pedestrian areas can be achieved by moderating the pedestrian density and the strength of attractive interaction, for example, in order to avoid situations involving extreme desire for limited resources.
  • Ultimate strength of corroded web-core sandwich beams
    (2013) Jelovica, Jasmin; Romanoff, Jani; Ehlers, Sören; Aromaa, Jari
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The corrosive marine environment is a threat to the ultimate strength of steel sandwich structures. Therefore, ultimate strength experiments were carried out in three-point bending for beams with different corrosion exposure times, i.e. one and two years. Standard laser-welded web-core sandwich beams are studied and different corrosion protection systems considered. The beams experienced general corrosion. The thickness reduction in unprotected plates and laser welds is around the typical 0.1 mm/year. This led to an ultimate strength reduction of 10% and 17% for beams with exposure times of one and two years, respectively. The experimental ultimate strength is in agreement with finite element simulations. The ultimate strength was maintained for the beams protected with coating or closed-cell polyurethane (PU) foam.
  • The role of shared space for the building and maintenance of community from the gender perspective - a longitudinal case study in a neighbourhood of Helsinki
    (2013) Horelli, Liisa
     School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Cohousing is here referred to as a form of housing with communal spaces, shared facilities and activities. Irrespective of the long history of cohousing, it constitutes only a small part of the total housing stock even in countries that regard cohousing as an alternative dwelling choice. Surprisingly, the importance of shared spaces has often been underestimated, although their role in the coproduction of community is significant, which in turn is one of the key driving forces for expanding cohousing into new markets. The aim of the article is to examine and discuss the role of shared space for the building and maintenance of community and its consequences for everyday life from the gender perspective. I argue that shared spaces are important for the building and maintenance of community, but they have a triple role, which together has an impact. Nevertheless, the Community House is a necessary but not a sufficient condition for the communal culture and its positive or negative consequences for the gender roles and the residents involved with care.
  • The effect of acetabular cup position on wear of a large-diameter metal-on-metal prosthesis studied with a hip joint simulator
    (2013) Saikko, Vesa; Ahlroos, Tiina; Revitzer, Hannu; Ryti, Oskari; Kuosmanen, Petri
     School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä