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  • 3501.
    Abbasian, Saeid
    et al.
    Handelshögskolan i Jönköping.
    Rylander, David
    Handelshögskolan i Jönköping.
    Regional samverkan kring upplevelseindustrins utveckling2008Other (Other (popular science, discussion, etc.))
  • 3502.
    Abbasian, Saeid
    et al.
    Handelshögskolan i Jönköping.
    Rylander, David
    Handelshögskolan i Jönköping.
    Regional utveckling med design och upplevelser2009Other (Other (popular science, discussion, etc.))
  • 3503.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Sarkadi, Anna
    Instititutionen för kvinnors och barns hälsa vid Uppsala universitet.
    Working together: A study on co-produced parenting support services in a Swedish municipality2012In: Barn, ISSN 0800-1669, Vol. 30, no 4, p. 129-148Article in journal (Refereed)
    Abstract [en]

    This article describes an evaluation of co-producing parenting support services in a rural municipalityin Sweden. The evaluation looked at the implementation process of a series of positive activities forchildren and their parents, data from the participating parents and the economy of the project.Methods included interviews, questionnaires, observations and a review of protocols, e-mails, andweb pages. Both qualitative and quantitative analytical methods were used. We identified two essentialcomponents for successful co-production: 1) The balance between the two actors (public and voluntarysector) in terms of interests, commitment and experienced positive impacts and 2) That bothactors remain within their core competencies. Parents were satisfied with the number and quality ofthe activities and reported improvement in their relationship with their child. Costs for the six sessionsprovided during the project were 1897 SEK/participant for the orienteering club and 2635 SEK/participantfor the riding club.

  • 3504.
    Abbasian, Saeid
    et al.
    Uppsala universitet. Inst för kvinnors och barns hälsa..
    Sarkadi, Anna
    Instititutionen för kvinnors och barns hälsa vid Uppsala universitet.
    Working together: A study on co-produced parenting support services in a Swedish municipality2012In: Barn, ISSN 0800-1669, Vol. 30, no 4, p. 129-148Article in journal (Refereed)
  • 3505.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Avdelningen för turismvetenskap och geografi.
    Yazdanfar, Darush
    Mittuniversitetet, Avdelningen för ekonomivetenskap och juridik.
    Attitudes towards participation in business development programmes: An ethnic comparison in Sweden2015In: European Journal of Training and Development, ISSN 2046-9012, Vol. 39, no 1, p. 59-75Article in journal (Refereed)
    Abstract [en]

    Purpose – The aim of the study is to investigate whether there are any differences between the attitudes towards participation in development programmes of entrepreneurs who are immigrants and those who are native-born. Design/methodology/approach – Several statistical methods, including a binary logistic regression model, were used to analyse a unique, firm-level dataset collected by the Swedish Small Business Forum in October and November 2012. The dataset was based on a questionnaire composed of 60 closed questions that was completed by 531 participants representing 395 companies. Findings – Based on the analysis of 15 different attitude variables, the empirical findings are that immigrant managers/owners are more likely to show a positive attitude to participation in development programmes, in terms of nine of those attitude variables, than their native counterparts. Because there are no data about second generation of immigrants in the sample, thus, this category may have had an impact on the results. However, there is no possibility to identify any impact on the results. Originality/value – There is no prior research focusing specifically on this question, and to the authors' knowledge, this study is the first that has attempted to deal with the issue. This study is based on a recent and unique database, and provides new evidence on the relationship between ethnicity and attitude towards participation in development programmes among entrepreneurs. Its context is different from that of prior research.

  • 3506.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Business, Economics and Law.
    Attitudes towards participation in business development programmes: An ethnic comparison in Sweden2015In: European Journal of Training and Development, ISSN 2046-9012, Vol. 39, no 1, p. 59-75Article in journal (Refereed)
    Abstract [en]

    Purpose – The aim of the study is to investigate whether there are any differences between the attitudes towards participation in development programmes of entrepreneurs who are immigrants and those who are native-born. Design/methodology/approach – Several statistical methods, including a binary logistic regression model, were used to analyse a unique, firm-level dataset collected by the Swedish Small Business Forum in October and November 2012. The dataset was based on a questionnaire composed of 60 closed questions that was completed by 531 participants representing 395 companies. Findings – Based on the analysis of 15 different attitude variables, the empirical findings are that immigrant managers/owners are more likely to show a positive attitude to participation in development programmes, in terms of nine of those attitude variables, than their native counterparts. Because there are no data about second generation of immigrants in the sample, thus, this category may have had an impact on the results. However, there is no possibility to identify any impact on the results. Originality/value – There is no prior research focusing specifically on this question, and to the authors' knowledge, this study is the first that has attempted to deal with the issue. This study is based on a recent and unique database, and provides new evidence on the relationship between ethnicity and attitude towards participation in development programmes among entrepreneurs. Its context is different from that of prior research.

  • 3507.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Avdelningen för turismvetenskap och geografi.
    Yazdanfar, Darush
    Mittuniversitetet, Avdelningen för ekonomivetenskap och juridik.
    Exploring the financing gap between native born women- and immigrant women-owned firms at the start-up stage: Empirical evidence from Swedish data2013In: International Journal of Gender and Entrepreneurship, ISSN 1756-6266, E-ISSN 1756-6274, Vol. 5, no 2, p. 157-173Article in journal (Refereed)
    Abstract [en]

    Purpose: The main purpose of this study is to provide empirical evidence which identifies the impact of ethnicity and other relevant variables on external capital acquisition among Swedish women-owned businesses at start-up. Design/methodology/approach: Several methods have been employed to analyze the sample including a binary logistic regression model. The sample consists of 836 women-owned businesses in southeast Sweden; 97 immigrant-owned, 739 native born-owned. Findings: The results indicate that there are partly significant differences between native women-owned firms and immigrant woman-owned businesses at start-up. Unlike the native-owned firms, the immigrant woman-owned businesses rely more on loans from family members and less on bank loans. Practical implications: The results reveal that age has a positive impact on loans from family members, while the additional job outside one's own business, the amount of the owner's personal start-up capital and firm size positively influenced access to capital from banks. The owners' level of education, previous business experience, the legal form taken by the firm and the industry affiliation conversely played no significant role in explaining the women owners' attitudes toward loans from either friends or the bank. Originality/value: To the authors' knowledge, this study is the first empirical investigation addressing this issue in the Swedish context. 

  • 3508.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Business, Economics and Law.
    Exploring the financing gap between native born women- and immigrant women-owned firms at the start-up stage: Empirical evidence from Swedish data2013In: International Journal of Gender and Entrepreneurship, ISSN 1756-6266, E-ISSN 1756-6274, Vol. 5, no 2, p. 157-173Article in journal (Refereed)
    Abstract [en]

    Purpose: The main purpose of this study is to provide empirical evidence which identifies the impact of ethnicity and other relevant variables on external capital acquisition among Swedish women-owned businesses at start-up. Design/methodology/approach: Several methods have been employed to analyze the sample including a binary logistic regression model. The sample consists of 836 women-owned businesses in southeast Sweden; 97 immigrant-owned, 739 native born-owned. Findings: The results indicate that there are partly significant differences between native women-owned firms and immigrant woman-owned businesses at start-up. Unlike the native-owned firms, the immigrant woman-owned businesses rely more on loans from family members and less on bank loans. Practical implications: The results reveal that age has a positive impact on loans from family members, while the additional job outside one's own business, the amount of the owner's personal start-up capital and firm size positively influenced access to capital from banks. The owners' level of education, previous business experience, the legal form taken by the firm and the industry affiliation conversely played no significant role in explaining the women owners' attitudes toward loans from either friends or the bank. Originality/value: To the authors' knowledge, this study is the first empirical investigation addressing this issue in the Swedish context. 

  • 3509.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Business, Economics and Law.
    Gender and informal financing at Start-up Stage2013Conference paper (Refereed)
  • 3510.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Avdelningen för turismvetenskap och geografi.
    Yazdanfar, Darush
    Mittuniversitetet, Avdelningen för ekonomivetenskap och juridik.
    Gender and informal financing at Start-up Stage: Swedish data2013In: Abstract database, 2013Conference paper (Refereed)
  • 3511.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Avdelningen för turismvetenskap och geografi.
    Yazdanfar, Darush
    Mittuniversitetet, Avdelningen för ekonomivetenskap och juridik.
    Gender as a determinant of informal capital in the financing of small firms’ start-up: Swedish data2015In: International Journal of Entrepreneurship and Small Business, ISSN 1476-1297, E-ISSN 1741-8054, Vol. 24, no 2, p. 249-267Article in journal (Refereed)
    Abstract [en]

    This research explores the differences in informal capital acquisition between female- and male-owned firms in the start-up stage in Sweden. A binary logistic regression model is used to analyse a sample including 836 female- and 1928 male-owned firms in 2008, providing 47,022 observations. The results indicate that the main explanatory variable, gender, is significant in distinguishing between female- and male-owned firms with regards to the use of informal capital in terms of loans from family members. Thus, female-owned firms tend to rely more on loans from family members than male-owned firms. The findings also indicate that one control variable, namely owners previous experience of starting up a company, negatively influences the use of loans from family members as a financing source in the start-up stage. This study is based on a unique and large sample including many different variables compared with previous research. Knowledge on the differences between Swedish female- and male-owned firms in using informal capital in the start-up stage is limited and ambiguous. The presented results contribute to research into small firm financing by adding insight into the relationships between informal capital acquisition, gender, and other relevant variables.

  • 3512.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Business, Economics and Law.
    Gender as a determinant of informal capital in the financing of small firms' start-ups: Swedish data2015In: International Journal of Entrepreneurship and Small Business, ISSN 1476-1297, E-ISSN 1741-8054, Vol. 24, no 2, p. 249-267Article in journal (Refereed)
    Abstract [en]

    This research explores the differences in informal capital acquisition between female- and male-owned firms in the start-up stage in Sweden. A binary logistic regression model is used to analyse a sample including 836 female- and 1928 male-owned firms in 2008, providing 47,022 observations. The results indicate that the main explanatory variable, gender, is significant in distinguishing between female- and male-owned firms with regards to the use of informal capital in terms of loans from family members. Thus, female-owned firms tend to rely more on loans from family members than male-owned firms. The findings also indicate that one control variable, namely owners previous experience of starting up a company, negatively influences the use of loans from family members as a financing source in the start-up stage. This study is based on a unique and large sample including many different variables compared with previous research. Knowledge on the differences between Swedish female- and male-owned firms in using informal capital in the start-up stage is limited and ambiguous. The presented results contribute to research into small firm financing by adding insight into the relationships between informal capital acquisition, gender, and other relevant variables.

  • 3513.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    Yazdanfar, Darush
    Mittuniversitetet, Institutionen för samhällsvetenskap.
    The Impact of Owner and Firm Characteristics on External Capital Acquisition at Start-up: Empirical Evidences from Swedish Data2012In: International Business Research, ISSN 1913-9004, E-ISSN 1913-9012, Vol. 5, no 12, p. 19-30Article in journal (Refereed)
    Abstract [en]

    The present study investigates whether owner and firm characteristics influence the use of external financing sources among Swedish small-owned firms at start-up stage. Several methods, including multinomial binary logistic regression have been employed to analyse a unique and comprehensive firm-level database, consisting of 2,814 firms gathered through interviews. The results show that three variables, i.e., loans from family members and friends, bank debt and funding from angel investors, are significant in distinguishing between Swedish native and immigrant-owned firms in the acquisition of financial sources in start-up. In addition, immigrant-owned firms tend to relay more on informal financial sources e.g. loan from family member, friends and angel investors, and less on bank loan. Furthermore, whereas, ethnicity influences the change of all these four variables significantly, gender merely affects loans from family members. Other variables, such as the owners’ age, prior experience in business, education, having an additional job beside one’s own business, the amount of personal start-up capital and firm size, as well as legal form and industry affiliation are partly important to explain the acquisition use of external capital at start-up stage.

  • 3514.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    The Impact of Owner and Firm Characteristics on External Capital Acquisition at Start-up: Empirical Evidences from Swedish Data2012In: International Business Research, ISSN 1913-9004, E-ISSN 1913-9012, Vol. 5, no 12, p. 19-30Article in journal (Refereed)
    Abstract [en]

    The present study investigates whether owner and firm characteristics influence the use of external financing sources among Swedish small-owned firms at start-up stage. Several methods, including multinomial binary logistic regression have been employed to analyse a unique and comprehensive firm-level database, consisting of 2,814 firms gathered through interviews. The results show that three variables, i.e., loans from family members and friends, bank debt and funding from angel investors, are significant in distinguishing between Swedish native and immigrant-owned firms in the acquisition of financial sources in start-up. In addition, immigrant-owned firms tend to relay more on informal financial sources e.g. loan from family member, friends and angel investors, and less on bank loan. Furthermore, whereas, ethnicity influences the change of all these four variables significantly, gender merely affects loans from family members. Other variables, such as the owners’ age, prior experience in business, education, having an additional job beside one’s own business, the amount of personal start-up capital and firm size, as well as legal form and industry affiliation are partly important to explain the acquisition use of external capital at start-up stage.

  • 3515.
    Abbasian, Saeid
    et al.
    Mittuniversitetet, Avdelningen för turismvetenskap och geografi.
    Yazdanfar, Darush
    Mittuniversitetet, Avdelningen för ekonomivetenskap och juridik.
    Hedberg, Charlotta
    Department of Human Geography, Stockholm University, 106 91 Stockholm, Sweden .
    The determinant of external financing at the start-up stage: Empirical evidences from Swedish data2014In: World Review of Entrepreneurship, Management and Sustainable Development, ISSN 1746-0573, E-ISSN 1746-0581, Vol. 10, no 1, p. 124-141Article in journal (Refereed)
    Abstract [en]

    Small firms in general have limited access to funding, which is a major problem for entrepreneurs. In particular, this problem is evident for women and ethnic minority groups. The purpose of the study is to examine empirically the impact of gender, ethnicity and other relevant variables on the access to external financing of new small firms. A sample of 2,764 female- And male-owned small businesses, based on a unique and large database gathered through interviews, was investigated employing binary logistic regression models. The results suggest that both gender and ethnicity are significant explanatory variables influencing the access to external capital at the start-up stage. Entrepreneurs' age, experience of starting businesses and education, as well as additional jobs beside their own business, are other variables that influence the way in which entrepreneurs finance their business. Moreover, firm characteristics in terms of personal start-up capital, firm size and legal form have an impact on financing behaviour at start-up. Since the knowledge about this issue is limited, the results of this study add to our understanding of the variables affecting the behaviour of small business endeavours in seeking funding at start-up.

  • 3516.
    Abbasian, Saeid
    et al.
    Mittuniversitetet.
    Yazdanfar, Darush
    Mittuniversitetet.
    Hedberg, Charlotta
    Stockholm University, Faculty of Social Sciences, Department of Human Geography.
    The determinant of external financing at the start-up stage: Empirical evidences from Swedish data2014In: World Review of Entrepreneurship, Management and Sustainable Development, ISSN 1746-0573, E-ISSN 1746-0581, Vol. 10, no 1, p. 124-141Article in journal (Refereed)
    Abstract [en]

    Small firms in general have limited access to funding, which is a major problem for entrepreneurs. In particular, this problem is evident for women and ethnic minority groups. The purpose of the study is to examine empirically the impact of gender, ethnicity and other relevant variables on the access to external financing of new small firms. A sample of 2,764 female– and male–owned small businesses, based on a unique and large database gathered through interviews, was investigated employing binary logistic regression models. The results suggest that both gender and ethnicity are significant explanatory variables influencing the access to external capital at the start–up stage. Entrepreneurs' age, experience of starting businesses and education, as well as additional jobs beside their own business, are other variables that influence the way in which entrepreneurs finance their business. Moreover, firm characteristics in terms of personal start–up capital, firm size and legal form have an impact on financing behaviour at start–up. Since the knowledge about this issue is limited, the results of this study add to our understanding of the variables affecting the behaviour of small business endeavours in seeking funding at start–up

  • 3517.
    Abbasian, Saeid
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Tourism Studies and Geography.
    Yazdanfar, Darush
    Mid Sweden University, Faculty of Human Sciences, Department of Business, Economics and Law.
    Hedberg, Charlotta
    Department of Human Geography, Stockholm University, 106 91 Stockholm, Sweden .
    The determinant of external financing at the start-up stage: Empirical evidences from Swedish data2014In: World Review of Entrepreneurship, Management and Sustainable Development, ISSN 1746-0573, E-ISSN 1746-0581, Vol. 10, no 1, p. 124-141Article in journal (Refereed)
    Abstract [en]

    Small firms in general have limited access to funding, which is a major problem for entrepreneurs. In particular, this problem is evident for women and ethnic minority groups. The purpose of the study is to examine empirically the impact of gender, ethnicity and other relevant variables on the access to external financing of new small firms. A sample of 2,764 female- And male-owned small businesses, based on a unique and large database gathered through interviews, was investigated employing binary logistic regression models. The results suggest that both gender and ethnicity are significant explanatory variables influencing the access to external capital at the start-up stage. Entrepreneurs' age, experience of starting businesses and education, as well as additional jobs beside their own business, are other variables that influence the way in which entrepreneurs finance their business. Moreover, firm characteristics in terms of personal start-up capital, firm size and legal form have an impact on financing behaviour at start-up. Since the knowledge about this issue is limited, the results of this study add to our understanding of the variables affecting the behaviour of small business endeavours in seeking funding at start-up.

  • 3518.
    Abbasinejad Enger, Shirin
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Dosimetry Studies of Different Radiotherapy Applications using Monte Carlo Radiation Transport Calculations2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Developing radiation delivery systems for optimisation of absorbed dose to the target without normal tissue toxicity requires advanced calculations for transport of radiation. In this thesis absorbed dose and fluence in different radiotherapy applications were calculated by using Monte Carlo (MC) simulations.

    In paper I-III external neutron activation of gadolinium (Gd) for intravascular brachytherapy (GdNCB) and tumour therapy (GdNCT) was investigated. MC codes MCNP and GEANT4 were compared. MCNP was chosen for neutron capture reaction calculations. Gd neutron capture reaction includes both very short range (Auger electrons) and long range (IC electrons and gamma) products. In GdNCB the high-energetic gamma gives an almost flat absorbed dose delivery pattern, up to 4 mm around the stent. Dose distribution at the edges and inside the stent may prevent stent edge and in-stent restenosis. For GdNCT the absorbed dose from prompt gamma will dominate over the dose from IC and Auger electrons in an in vivo situation. The absorbed dose from IC electrons will enhance the total absorbed dose in the tumours and contribute to the cell killing.

    In paper IV a model for calculation of inter-cluster cross-fire radiation dose from β-emitting radionuclides in a breast cancer model was developed. GEANT4 was used for obtaining absorbed dose. The dose internally in cells binding the isotope (self-dose) increased with decreasing β-energy except for the radionuclides with substantial amounts of conversion electrons and Auger electrons. An effective therapy approach may be a combination of radionuclides where the high self-dose from nuclides with low β-energy should be combined with the inter-cell cluster cross-fire dose from high energy β-particles.

    In paper V MC simulations using correlated sampling together with importance sampling were used to calculate spectra perturbations in detector volumes caused by the detector silicon chip and its encapsulation. Penelope and EGSnrc were used and yielded similar results. The low energy part of the electron spectrum increased but to a less extent if the silicon detector was encapsulated in low z-materials.

  • 3519.
    Abbasinejad Enger, Shirin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Fortin, Marc-André
    Lundqvist, Hans
    Munck af Rosenschöld, Per
    Dosimetry for gadolinium neutron capture therapy (GdNCT)Manuscript (Other academic)
  • 3520.
    Abbasinejad Enger, Shirin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Munck af Rosenschöld, Per
    Rezaei, Arash
    Lundqvist, Hans
    Monte Carlo calculations of thermal neutron capture in gadolinium: a comparison of GEANT4 and MCNP with measurements.2006In: Medical Physics, ISSN 0094-2405, Vol. 33, no 2, p. 337-341Article in journal (Refereed)
  • 3521.
    Abbasinejad Enger, Shirin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Rezaei, Arash
    Munck af Rosenschöld, Per
    Lundqvist, Hans
    Gadolinium neutron capture brachytherapy (GdNCB), a new treatment method for intravascular brachytherapy.2006In: Medical Physics, ISSN 0094-2405, Vol. 33, no 1, p. 46-51Article in journal (Refereed)
  • 3522.
    Abbasiverki, Roghayeh
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Analysis of underground concrete pipelines subjected to seismic high-frequency loads2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Buried pipelines are tubular structures that are used for transportation of important liquid materials and gas in order to provide safety for human life. During an earthquake, imposed loads from soil deformations on concrete pipelines may cause severe damages, possibly causing disturbance in vital systems, such as cooling of nuclear power facilities. The high level of safety has caused a demand for reliable seismic analyses, also for structures built in the regions that have not traditionally been considered as highly seismically active. The focus in this study is on areas with seismic and geological conditions corresponding to those in Sweden and Northern Europe. Earthquakes in Sweden for regions with hard rock dominated by high-frequency ground vibrations, Propagation of such high-frequency waves through the rock mass and soil medium affect underground structures such as pipelines.

    The aim of this project is investigating parameters that affect response of buried pipelines due to high-frequency seismic excitations. The main focus of the study is on reinforced concrete pipelines. Steel pipelines are also studied for comparison purposes. The effects of water mass, burial depth, soil layer thickness and non-uniform ground thickness caused by inclined bedrock are studied. The results are compared to those obtained for low-frequency earthquakes and the relationship between strong ground motion parameters and pipelines response is investigated. It is shown that, especially for high frequency earthquake excitations, non-uniform ground thickness due to inclined bedrock significantly increase stresses in the pipelines. For the conditions studied, it is clear that high-frequency seismic excitation is less likely to cause damage to buried concrete pipelines. However, the main conclusion is that seismic analysis is motivated also for pipelines in high-frequency earthquake areas since local variation in the ground conditions can have a significant effect on the safety.

  • 3523.
    Abbasiverki, Roghayeh
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Ansell, Anders
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Initial study on seismic analyses of concrete and embankment dams in Sweden2017Report (Other academic)
  • 3524.
    Abbasiverki, Roghayeh
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Ansell, Anders
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Analysis of buried reinforced concrete pipelines subjected to seismic waves2014Conference paper (Refereed)
  • 3525.
    Abbasiverki, Roghayeh
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Ansell, Anders
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Larsson, Stefan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Seismic response of buried concrete pipelines subjected to highfrequency earthquakesIn: Geotechnical and Geological Engineering, ISSN 0960-3182, E-ISSN 1573-1529Article in journal (Refereed)
    Abstract [en]

    Buried pipelines are tubular structures that cross large areas with different geological conditions. During an earthquake, imposed loads from soil deformations on concrete pipelines may cause severe damages. In this study, the use of two-dimensional finite element models of pipelines and surrounding soil for simulation of seismic waves that propagate from the bedrock through the soil are demonstrated. The models describe both longitudinal and transverse cross-sections of pipelines and the soil-pipe interaction is modelled as a nonlinear behaviour. The effects of uniform ground with different burial depths, soil layer thickness, soil stiffness and bedrock geometry on the seismic response of reinforced concrete pipelines is studied. Two earthquakes, with high and low frequency contents, are employed for the dynamic analysis. The results show that there is a much smaller risk of damage from high-frequency earthquakes, but that there is a significant effect on the response due to possible irregular ground with inclined bedrock.

  • 3526.
    Abbasiverki, Roghayeh
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Ansell, Anders
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Malm, Richard
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Analysis of shallowly buried reinforced concrete pipelines subjected to earthquake loads2014In: Nordic Concrete Research, ISSN 0800-6377, no 51, p. 111-130Article in journal (Refereed)
    Abstract [en]

    Buried reinforced concrete pipelines are widelyused in e.g. water and wastewater systems. Failure of these infrastructures mayresult in drastic effects and recently they have been brought into focus asvital components in safety systems for nuclear power installations. The highlevel of safety has here lead to a demand for reliable earthquake risk analyses.In this paper, methods are compared and the use of seismic design loadsdemonstrated. FE analysis in 2D of soil-pipe interaction under seismic wavepropagation is performed. The performance of concrete pipes subjected toseismic waves with different frequency content is evaluated with respect todifferent soil condition but also water mass effect.

  • 3527.
    Abbasnejad, Susan
    et al.
    Södertörn University College, School of Communication, Media and it.
    Moaf, Ronak
    Södertörn University College, School of Communication, Media and it.
    Sociala medier i den svenska nyhetsrapporteringen om Iran2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Tidigare forskning har visat att sociala medier är avgörande för informationsspridning i länder med begränsad yttrandefrihet, men också att sociala medier kan vara svårtolkade samt vilseledande. Syftet med denna intervjustudie var att åskådliggöra relationen mellan sociala medier och traditionell journalistik. Studien fokuserade på svenska journalisters användning och värdering av sociala medier i rapporteringen om den politiska utvecklingen i Iran, under perioden 12 juni 2009 till 11 februari 2010.

    Kvalitativa forskningsintervjuer utfördes med de svenska journalisterna Natalie Besér (DN), Per Jönsson (DN), Said Montazeri (Radio Hambastegi), Mattias Pleijel (TT) och Kinga Sandén (Sydsvenskan). Intervjuerna fokuserade på följande fem specifika händelser: presidentvalets resultat (13 juni, 2009), Khameneis fredagsbön (19 juni, 2009), Neda Soltans dödsskjutning (20 juni, 2009), demonstrationerna under Ashura (27december) och demonstrationerna under revolutionens årsdag (11 februari, 2010).

    Vår analys visar att journalisterna inte var odelat positiva till sociala medier men att de använde sociala medier som källor i varierande utsträckning. Det var också påtagligt att det skedde direkta källhänvisningar till olika sociala medier i journalisternas texter eller inslag. Samtliga journalister kontrollerade den information de hämtade från sociala medier med andra icke-sociala mediekällor för att verifiera korrektheten innan de publicerade informationen. Våra slutsatser är att sociala medier på ett berikande sätt kompletterar traditionell journalistik då de används medvetet och källkritiskt.

  • 3528.
    Abbasova, Tahira
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
    Detection and analysis of changes in desertification in the Caspian Sea Region2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Caspian Region includes the Caspian Sea and five littoral states: Azerbaijan, Iran, Turkmenistan, Kazakhstan and Russian. 40% of the Caspian coastal zone is arid, 69% of this territory undergone desertification according to international reports. Among the reasons are soil erosion caused by water, wind and irrigation, the salinization of soil, intense bioresources usage, and soil pollution due to oil extraction and production. Desertification is a serious problem, at global, national and local scales. It is important to know what should be sustained or developed in order to protect land from desertification. The generalization of data over desertification processes in Caspian countries, studying the dynamics of this process in space and time could help facilitate measures to counter regional desertification.

    To understand Caspian Region coastal desertification phenomenon, vegetation cover satellite images for the years 1982 – 2006 were investigated to give map vegetation changes over time. The Normalized Difference Vegetation Index (NDVI) data for this study was derived from the Global Inventory Modeling and Mapping Studies (GIMMS) dataset, with the spatial resolution of 8 km.

    A coastal strip 160 km from the coast, divided by countries, was investigated. Theanalyses were focused on extent and severity of vegetation cover degradation, and possible causes such as landscape, land use history and culture, climatic changes and policies. The aim was to address questions related to desertification phenomenon, by focusing on Caspian Region time-series of vegetation cover data and investigation patterns of desertification in the region.

    In this study evidence of land degradation in the Caspian Region countries was found to occur on local scales or sub-national scales rather than across the regional as a whole. Changes in vegetation cover revealed by AVHRR NDVI appeared to be reversible in character and were dependent on the climate conditions, and anthropogenic impact in approximately equal proportions.

  • 3529.
    Abbaspour Asadollah, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Bugs and Debugging of Concurrent and Multicore Software2016Licentiate thesis, comprehensive summary (Other academic)
  • 3530.
    Abbaspour Asadollah, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Concurrency Bugs: Characterization, Debugging and Runtime Verification2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Concurrent software has been increasingly adopted in recent years, mainly due to the introduction of multicore platforms. However, concurrency bugs are still difficult to test and debug due to their complex interactions involving multiple threads (or tasks). Typically, real world concurrent software has huge state spaces. Thus, testing techniques and handling of concurrency bugs need to focus on exposing the bugs in this large space. However, existing solutions typically do not provide debugging information to developers (and testers) for understanding the bugs.

    Our work focuses on improving concurrent software reliability via three contributions: 1) An investigation of concurrent software challenges with the aim to help developers (and testers) to better understand concurrency bugs. We propose a classification of concurrency bugs and discuss observable properties of each type of bug. In addition, we identify a number of gaps in the body of knowledge on concurrent software bugs and their debugging. 2) Exploring concurrency related bugs in real-world software with respect to the reproducibility of bugs, severity of their consequence and effort required to fix them. Our findings here is that concurrency bugs are different from other bugs in terms of their fixing time and severity, while they are similar in terms of reproducibility. 3) A model for monitoring concurrency bugs and the implementation and evaluation of a related runtime verification tool to detect the bugs. In general, runtime verification techniques are used to (a) dynamically verify that the observed behaviour matches specified properties and (b) explicitly recognize understandable behaviors in the considered software. Our implemented tool is used to detect concurrency bugs in embedded software and is in its current form tailored for the FreeRTOS operating system. It helps developers and testers to automatically identify concurrency bugs and subsequently helps to reduce their finding and fixing time.

  • 3531.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Daniel, Sundmark
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Eldh, S.
    Ericsson AB, Kista, Sweden.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    A Runtime Verification Tool for Detecting Concurrency Bugs in FreeRTOS Embedded Software2018In: Proceedings - 17th International Symposium on Parallel and Distributed Computing, ISPDC 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 172-179, article id 8452035Conference paper (Refereed)
    Abstract [en]

    This article presents a runtime verification tool for embedded software executing under the open source real-time operating system FreeRTOS. The tool detects and diagnoses concurrency bugs such as deadlock, starvation, and suspension based-locking. The tool finds concurrency bugs at runtime without debugging and tracing the source code. The tool uses the Tracealyzer tool for logging relevant events. Analysing the logs, our tool can detect the concurrency bugs by applying algorithms for diagnosing each concurrency bug type individually. In this paper, we present the implementation of the tool, as well as its functional architecture, together with illustration of its use. The tool can be used during program testing to gain interesting information about embedded software executions. We present initial results of running the tool on some classical bug examples running on an AVR 32-bit board SAM4S. 

  • 3532.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Daniel, Sundmark
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Eldh, S.
    Ericsson AB, Stockholm, Sweden.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Concurrency bugs in open source software: a case study2017In: Journal of Internet Services and Applications, ISSN 1867-4828, Vol. 8, no 1, article id 4Article in journal (Refereed)
    Abstract [en]

    Concurrent programming puts demands on software debugging and testing, as concurrent software may exhibit problems not present in sequential software, e.g., deadlocks and race conditions. In aiming to increase efficiency and effectiveness of debugging and bug-fixing for concurrent software, a deep understanding of concurrency bugs, their frequency and fixing-times would be helpful. Similarly, to design effective tools and techniques for testing and debugging concurrent software, understanding the differences between non-concurrency and concurrency bugs in real-word software would be useful. This paper presents an empirical study focusing on understanding the differences and similarities between concurrency bugs and other bugs, as well as the differences among various concurrency bug types in terms of their severity and their fixing time, and reproducibility. Our basis is a comprehensive analysis of bug reports covering several generations of five open source software projects. The analysis involves a total of 11860 bug reports from the last decade, including 351 reports related to concurrency bugs. We found that concurrency bugs are different from other bugs in terms of their fixing time and severity while they are similar in terms of reproducibility. Our findings shed light on concurrency bugs and could thereby influence future design and development of concurrent software, their debugging and testing, as well as related tools.

  • 3533.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Daniel, Sundmark
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Runtime Verification for Detecting Suspension Bugs in Multicore and Parallel Software2017In: Proceedings - 10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017, 2017, p. 77-80Conference paper (Refereed)
    Abstract [en]

    Multicore hardware development increases the popularity of parallel and multicore software, while testing and debugging the software become more difficult, frustrating and costly. Among all types of software bugs, concurrency bugs are both important and troublesome. This type of bugs is increasingly becoming an issue, particularly due to the growing prevalence of multicore hardware. Suspension-based-locking bug is one type of concurrency bugs. This position paper proposes a model based on runtime verification and reflection technique in the context of multicore and parallel software to monitor and detect suspension-based-locking bugs. The model is not only able to detect faults, but also diagnose and even repair them. The model is composed of four layers: Logging, Monitoring, Suspension Bug Diagnosis and Mitigation. The logging layer will observe the events and save them into a file system. The monitoring layer will detect the presents of bugs in the software. The suspension bug diagnosis will identify Suspension bugs by comparing the captured data with the suspension bug properties. Finally, the mitigation layer will reconfigure the software to mitigate the suspension bugs. A functional architecture of a runtime verification tool is also proposed in this paper. This architecture is based on the proposed model and is comprised of different modules. 

  • 3534.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. 7809198067.
    Enoiu, Eduard Paul
    Mälardalen University, School of Innovation, Design and Engineering.
    Causevic, Adnan
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Daniel, Sundmark
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering.
    A Runtime Verification based Concurrency Bug Detector for FreeRTOS Embedded SoftwareIn: Article in journal (Other academic)
  • 3535.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sundmark, Daniel
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Eldh, Sigrid
    Ericsson AB, Kista, Sweden.
    Towards Classification of Concurrency Bugs Based on Observable Properties2015In: Proceedings - 1st International Workshop on Complex Faults and Failures in Large Software Systems, COUFLESS 2015, 2015, p. 41-47Conference paper (Refereed)
    Abstract [en]

    In software engineering, classification is a way to find an organized structure of knowledge about objects. Classification serves to investigate the relationship between the items to be classified, and can be used to identify the current gaps in the field. In many cases users are able to order and relate objects by fitting them in a category. This paper presents initial work on a taxonomy for classification of errors (bugs) related to concurrent execution of application level software threads. By classifying concurrency bugs based on their corresponding observable properties, this research aims to examine and structure the state of the art in this field, as well as to provide practitioner support for testing and debugging of concurrent software. We also show how the proposed classification, and the different classes of bugs, relates to the state of the art in the field by providing a mapping of the classification to a number of recently published papers in the software engineering field.

  • 3536.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Inam, Rafia
    Ericsson AB, Kista, Sweden.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    A Survey on Testing for Cyber Physical System2015In: Testing Software and Systems: 27th IFIP WG 6.1 International Conference, ICTSS 2015, Sharjah and Dubai, United Arab Emirates, November 23-25, 2015, Proceedings, 2015, p. 194-207Conference paper (Refereed)
    Abstract [en]

    Cyber Physical Systems (CPS) bridge the cyber-world of computing and communications with the physical world and require development of secure and reliable software. It asserts a big challenge not only on testing and verifying the correctness of all physical and cyber components of such big systems, but also on integration of these components. This paper develops a categorization of multiple levels of testing required to test CPS and makes a comparison of these levels with the levels of software testing based on the V-model. It presents a detailed state-of-the-art survey on the testing approaches performed on the CPS. Further, it provides challenges in CPS testing.

  • 3537.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Saadatmand, Mehrdad
    SICS Swedish ICT, Västerås, Sweden.
    Eldh, Sigrid
    Ericsson AB, Kista, Sweden.
    Sundmark, Daniel
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    A Model for Systematic Monitoring and Debugging of Starvation Bugs in Multicore Software2016In: 2016 ASE Workshop on Specification, Comprehension, Testing and Debugging of Concurrent Programs SCTDCP2016, 2016Conference paper (Refereed)
    Abstract [en]

    With the development of multicore hardware, concurrent, parallel and multicore software are becoming increasingly popular. Software companies are spending a huge amount of time and resources to nd and debug the bugs. Among all types of software bugs, concurrency bugs are also important and troublesome. This type of bugs is increasingly becoming an issue particularly due to the growing prevalence of multicore hardware. In this position paper, we propose a model for monitoring and debugging Starvation bugs as a type of concurrency bugs in multicore software. The model is composed into three phases: monitoring, detecting and debugging. The monitoring phase can support detecting phase by storing collected data from the system execution. The detecting phase can support debugging phase by comparing the stored data with starvation bug's properties, and the debugging phase can help in reproducing and removing the Starvation bug from multicore software. Our intention is that our model is the basis for developing tool(s) to enable solving Starvation bugs in software for multicore platforms.

  • 3538.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sundmark, Daniel
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Eldh, Sigrid
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Ericsson AB, Kista, Sweden .
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Afza, Wasif
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    10 Years of research on debugging concurrent and multicore software: a systematic mapping study2017In: Software quality journal, ISSN 0963-9314, E-ISSN 1573-1367, Vol. 25, no 1, p. 49-82Article in journal (Refereed)
    Abstract [en]

    Debugging – the process of identifying, localizing and fixing bugs – is a key activity in software development. Due to issues such as non-determinism and difficulties of reproducing failures, debugging concurrent software is significantly more challenging than debugging sequential software. A number of methods, models and tools for debugging concurrent and multicore software have been proposed, but the body of work partially lacks a common terminology and a more recent view of the problems to solve. This suggests the need for a classification, and an up-to-date comprehensive overview of the area. 

    This paper presents the results of a systematic mapping study in the field of debugging of concurrent and multicore software in the last decade (2005– 2014). The study is guided by two objectives: (1) to summarize the recent publication trends and (2) to clarify current research gaps in the field.

    Through a multi-stage selection process, we identified 145 relevant papers. Based on these, we summarize the publication trend in the field by showing distribution of publications with respect to year , publication venues , representation of academia and industry , and active research institutes . We also identify research gaps in the field based on attributes such as types of concurrency bugs, types of debugging processes , types of research  and research contributions.

    The main observations from the study are that during the years 2005–2014: (1) there is no focal conference or venue to publish papers in this area, hence a large variety of conferences and journal venues (90) are used to publish relevant papers in this area; (2) in terms of publication contribution, academia was more active in this area than industry; (3) most publications in the field address the data race bug; (4) bug identification is the most common stage of debugging addressed by articles in the period; (5) there are six types of research approaches found, with solution proposals being the most common one; and (6) the published papers essentially focus on four different types of contributions, with ”methods” being the type most common one.

    We can further conclude that there is still quite a number of aspects that are not sufficiently covered in the field, most notably including (1) exploring correction  and fixing bugs  in terms of debugging process; (2) order violation, suspension  and starvation  in terms of concurrency bugs; (3) validation and evaluation research  in the matter of research type; (4) metric  in terms of research contribution. It is clear that the concurrent, parallel and multicore software community needs broader studies in debugging.This systematic mapping study can help direct such efforts.

  • 3539.
    Abbaspour Asadollah, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sundmark, Daniel
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Eldh, Sigrid
    Ericsson AB, Kista, Sweden.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Paul Enoiu, Eduard
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    A Study on Concurrency Bugs in an Open Source Software2016In: IFIP Advances in Information and Communication Technology, vol. 472, 2016, Vol. 472, p. 16-31Conference paper (Refereed)
    Abstract [en]

    Concurrent programming puts demands on software debugging and testing, as concurrent software may exhibit problems not present in sequential software, e.g., deadlocks and race conditions. In aiming to increase efficiency and effectiveness of debugging and bug-fixing for concurrent software, a deep understanding of concurrency bugs, their frequency and fixingtimes would be helpful. Similarly, to design effective tools and techniques for testing and debugging concurrent software understanding the differences between non-concurrency and concurrency bugs in real-word software would be useful.

  • 3540.
    Abbaspour Assadollah, Sara
    et al.
    Mälardalen University, Sweden.
    Saadatmand, Mehrdad
    RISE, Swedish ICT, SICS.
    Eldh, Sigrid
    Ericsson AB, Sweden.
    Sundmark, Daniel
    Mälardalen University, Sweden.
    Hansson, Hans
    Mälardalen University, Sweden.
    A Model for Systematic Monitoring and Debugging of Starvation Bugs in Multicore Software2016In: Proceedings of the 1st International Workshop on Specification, Comprehension, Testing, and Debugging of Concurrent Programs (SCTDCP 2016), 2016, p. 7-11Conference paper (Refereed)
    Abstract [en]

    With the development of multicore hardware, concurrent, parallel and multicore software are becoming increasingly popular. Software companies are spending a huge amount of time and resources to nd and debug the bugs. Among all types of software bugs, concurrency bugs are also important and troublesome. This type of bugs is increasingly becoming an issue particularly due to the growing prevalence of multicore hardware. In this position paper, we propose a model for monitoring and debugging Starvation bugs as a type of concurrency bugs in multicore software. The model is composed into three phases: monitoring, detecting and debugging. The monitoring phase can support detecting phase by storing collected data from the system execution. The detecting phase can support debugging phase by comparing the stored data with starvation bug's properties, and the debugging phase can help in reproducing and removing the Starvation bug from multicore software. Our intention is that our model is the basis for developing tool(s) to enable solving Starvation bugs in software for multicore platforms.

  • 3541.
    Abbaspour, Katherine
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Social Work.
    Pertot, Jacqueline
    Stockholm University, Faculty of Social Sciences, Department of Social Work.
    En kvalitativ analys av förändringsprocesser från ett liv med, till ett liv utan våld och kriminalitet.2008Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study was to reach an increased understanding about how the changing process with regards to criminality and violent behaviour of men may look like. The questions on these issues were: (1) How do three men describe the changing process of their life manner from violence and criminality into non violence and non criminal way of life? (2) How do three professionals from the probation service describe the life changing process of men from violence and criminality into non violence and non criminal way of life? Our research study was thoroughly done based on a qualitative approach method, interviewing six individuals by following the theme focused interview guidelines. Three men with previous violence and crime records, actors, and three professionals working in the probation service, observers, were interviewed and the selection was intended to highlight the problem from two angles. The interviews were analyzed through social psychology and pattern which describes the process of changes. The results showed that the changing process from violence and criminality is complex and there are indeed several factors likewise major cause such as important circumstances, supporter and mentor, altered self-image and motivation was of great importance. The results correspond with previous research.

  • 3542.
    Abbaspour, Kristina
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Physiotheraphy.
    Lindén, Charlotta
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Physiotheraphy.
    Primärvårdsjukgymnastens yrkesroll och kompetens, nu och i framtiden.2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 3543.
    Abbaspour, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Electromyogram Signal Enhancement and Upper-Limb Myoelectric Pattern Recognition2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Losing a limb causes difficulties in our daily life. To regain the ability to live an independent life, artificial limbs have been developed. Hand prostheses belong to a group of artificial limbs that can be controlled by the user through the activity of the remnant muscles above the amputation. Electromyogram (EMG) is one of the sources that can be used for control methods for hand prostheses. Surface EMGs are powerful, non-invasive tools that provide information about neuromuscular activity of the subjected muscle, which has been essential to its use as a source of control for prosthetic limbs. However, the complexity of this signal introduces a big challenge to its applications. EMG pattern recognition to decode different limb movements is an important advancement regarding the control of powered prostheses. It has the potential to enable the control of powered prostheses using the generated EMG by muscular contractions as an input. However, its use has yet to be transitioned into wide clinical use. Different algorithms have been developed in state of the art to decode different movements; however, the challenge still lies in different stages of a successful hand gesture recognition and improvements in these areas could potentially increase the functionality of powered prostheses. This thesis firstly focuses on improving the EMG signal’s quality by proposing novel and advanced filtering techniques. Four efficient approaches (adaptive neuro-fuzzy inference system-wavelet, artificial neural network-wavelet, adaptive subtraction and automated independent component analysis-wavelet) are proposed to improve the filtering process of surface EMG signals and effectively eliminate ECG interferences. Then, the offline performance of different EMG-based recognition algorithms for classifying different hand movements are evaluated with the aim of obtaining new myoelectric control configurations that improves the recognition stage. Afterwards, to gain proper insight on the implementation of myoelectric pattern recognition, a wide range of myoelectric pattern recognition algorithms are investigated in real time. The experimental result on 15 healthy volunteers suggests that linear discriminant analysis (LDA) and maximum likelihood estimation (MLE) outperform other classifiers. The real-time investigation illustrates that in addition to the LDA and MLE, multilayer perceptron also outperforms the other algorithms when compared using classification accuracy and completion rate.

  • 3544.
    Abbaspour, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Evaluation of surface EMG-based recognition algorithms for decoding hand movementsManuscript (preprint) (Other academic)
  • 3545.
    Abbaspour, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Proposing Combined Approaches to Remove ECG Artifacts from Surface EMG Signals2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Electromyography (EMG) is a tool routinely used for a variety of applications in a very large breadth of disciplines. However, this signal is inevitably contaminated by various artifacts originated from different sources. Electrical activity of heart muscles, electrocardiogram (ECG), is one of sources which affects the EMG signals due to the proximity of the collection sites to the heart and makes its analysis non-reliable. Different methods have been proposed to remove ECG artifacts from surface EMG signals; however, in spite of numerous attempts to eliminate or reduce this artifact, the problem of accurate and effective de-noising of EMG still remains a challenge. In this study common methods such as high pass filter (HPF), gating method, spike clipping, hybrid technique, template subtraction, independent component analysis (ICA), wavelet transform, wavelet-ICA, artificial neural network (ANN), and adaptive noise canceller (ANC) and adaptive neuro-fuzzy inference system (ANFIS) are used to remove ECG artifacts from surface EMG signals and their accuracy and effectiveness is investigated. HPF, gating method and spike clipping are fast; however they remove useful information from EMG signals. Hybrid technique and ANC are time consuming. Template subtraction requires predetermined QRS pattern. Using wavelet transform some artifacts remain in the original signal and part of the desired signal is removed. ICA requires multi-channel signals. Wavelet-ICA approach does not require multi-channel signals; however, it is user-dependent. ANN and ANFIS have good performance, but it is possible to improve their results by combining them with other techniques. For some applications of EMG signals such as rehabilitation, motion control and motion prediction, the quality of EMG signals is very important. Furthermore, the artifact removal methods need to be online and automatic. Hence, efficient methods such as ANN-wavelet, adaptive subtraction and automated wavelet-ICA are proposed to effectively eliminate ECG artifacts from surface EMG signals. To compare the results of the investigated methods and the proposed methods in this study, clean EMG signals from biceps and deltoid muscles and ECG artifacts from pectoralis major muscle are recorded from five healthy subjects to create 10 channels of contaminated EMG signals by adding the recorded ECG artifacts to the clean EMG signals. The artifact removal methods are also applied to the 10 channels of real contaminated EMG signals from pectoralis major muscle of the left side. Evaluation criteria such as signal to noise ratio, relative error, correlation coefficient, elapsed time and power spectrum density are used to evaluate the performance of the proposed methods. It is found that the performance of the proposed ANN-wavelet method is superior to the other methods with a signal to noise ratio, relative error and correlation coefficient of 15.53, 0.01 and 0.98 respectively.

  • 3546.
    Abbaspour, Sara
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Surface EMG signal processing: Removing ECG interferences and classifying hand movements2017In: Medicinteknikdagarna 2017 MTD 2017, Västerås, Sweden, 2017Conference paper (Refereed)
  • 3547.
    Abbaspour, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Chiew, Thiam Kian
    University of Malaya, Kuala Lumpur, Malaysia .
    Web Service Response Time Monitoring: Architecture and Validation2011In: Communications in Computer and Information Science Volume 164 CCIS, 2011, 2011, p. 276-282Conference paper (Refereed)
    Abstract [en]

    Web services are used in many Web applications in order to save time and cost during software development process. To peruse Web service response time, a suitable tool is needed to automate the measurement of the response time. However, not many suitable tools are available for automatic measurement of response time. This research is carried out in the context of quality of Web services in order to measure and visualize Web service response time. The method proposed in this research for accomplishing this goal is based on creating a proxy for connecting to the required Web service, and then calculating the Web services response time via the proxy. A software tool is designed based on the proposed method in order to guide the implementation that is still in progress. The tool can be validated through empirical validation using three test cases for three different Web service access situations.

  • 3548.
    Abbaspour, Sara
    et al.
    Amirkabir University of Technology, Tehran, Iran.
    Fallah, Ali
    Amirkabir University of Technology, Tehran, Iran.
    A Combination Method for Electrocardiogram Rejection from Surface Electromyogram2014In: Open Biomedical Engineering Journal, ISSN 1874-1207, E-ISSN 1874-1207, Vol. 8, no 1, p. 13-19Article in journal (Refereed)
    Abstract [en]

    The electrocardiogram signal which represents the electrical activity of the heart provides interference in the recording of the electromyogram signal, when the electromyogram signal is recorded from muscles close to the heart. Therefore, due to impurities, electromyogram signals recorded from this area cannot be used. In this paper, a new method was developed using a combination of artificial neural network and wavelet transform approaches, to eliminate the electrocardiogram artifact from electromyogram signals and improve results. For this purpose, contaminated signal is initially cleaned using the neural network. With this process, a large amount of noise can be removed. However, low-frequency noise components remain in the signal that can be removed using wavelet. Finally, the result of the proposed method is compared with other methods that were used in different papers to remove electrocardiogram from electromyogram. In this paper in order to compare methods, qualitative and quantitative criteria such as signal to noise ratio, relative error, power spectrum density and coherence have been investigated for evaluation and comparison. The results of signal to noise ratio and relative error are equal to 15.6015 and 0.0139, respectively.

  • 3549.
    Abbaspour, Sara
    et al.
    Amirkabir University of technology,Tehran, Iran.
    Fallah, Ali
    Amirkabir University of technology,Tehran, Iran.
    Removing ECG Artifact from the Surface EMG Signal Using Adaptive Subtraction Technique2014In: Biomedical Physics and Engineering, ISSN 2251-7200, Vol. 4, no 1, p. 33-38Article in journal (Refereed)
    Abstract [en]

    Background: The electrocardiogram artifact is a major contamination in the electromyogram signals when electromyogram signal is recorded from upper trunk muscles and because of that the contaminated electromyogram is not useful. Objective: Removing electrocardiogram contamination from electromyogram signals. Methods: In this paper, the clean electromyogram signal, electrocardiogram artifact and electrocardiogram signal were recorded from leg muscles, the pectoralis major muscle of the left side and V4, respectively. After the pre-processing, contaminated electromyogram signal is simulated with a combination of clean electromyogram and electrocardiogram artifact. Then, contaminated electromyogram is cleaned using adaptive subtraction method. This method contains some steps; (1) QRS detection, (2) formation of electrocardiogram template by averaging the electrocardiogram complexes, (3) using low pass filter to remove undesirable artifacts, (4) subtraction. Results: Performance of our method is evaluated using qualitative criteria, power spectrum density and coherence and quantitative criteria signal to noise ratio, relative error and cross correlation. The result of signal to noise ratio, relative error and cross correlation is equal to 10.493, 0.04 and %97 respectively. Finally, there is a comparison between proposed method and some existing methods. Conclusion: The result indicates that adaptive subtraction method is somewhat effective to remove electrocardiogram artifact from contaminated electromyogram signal and has an acceptable result.

  • 3550.
    Abbaspour, Sara
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Fallah, Ali
    Amirkabir University of Technology, Tehran, Iran.
    Lindén, Maria
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Gholamhosseini, Hamid
    Auckland University of Technology, Auckland, New Zealand.
    A Novel Approach for Removing ECG Interferences from Surface EMG signals Using a Combined ANFIS and Wavelet2016In: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 26, p. 52-59Article in journal (Refereed)
    Abstract [en]

    In recent years, the removal of electrocardiogram (ECG) interferences from electromyogram (EMG) signals has been given large consideration. Where the quality of EMG signal is of interest, it is important to remove ECG interferences from EMG signals. In this paper, an efficient method based on a combination of adaptive neuro-fuzzy inference system (ANFIS) and wavelet transform is proposed to effectively eliminate ECG interferences from surface EMG signals. The proposed approach is compared with other common methods such as high-pass filter, artificial neural network, adaptive noise canceller, wavelet transform, subtraction method and ANFIS. It is found that the performance of the proposed ANFIS-wavelet method is superior to the other methods with the signal to noise ratio and relative error of 14.97 dB and 0.02 respectively and a significantly higher correlation coefficient (p < 0.05).

68697071727374 3501 - 3550 of 1191585
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