| 1. |
- Bengtsson, Lars, 1958-, et al.
(author)
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Brains for Autonomous Robots : Hardware and Surgery Tools
- 1994
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In: Proceedings of PerAc '94. From Perception to Action. - Los Alamitos : IEEE. - 0818664827 - 9780818664823 ; , s. 436-439
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Conference paper (peer-reviewed)abstract
- This paper presents a hardware architecture and a software tool needed for future autonomous robots. Specific attention is given to the execution of artificial neural networks and to the need for a good inspection and visualization tool when developing this kind of systems. Achievable performance using state-of-the-art technology is estimated and module miniaturization issues are discussed. © 1994 IEEE.
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| 2. |
- Bergman, Stefan, 1959-, et al.
(author)
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Chronic musculoskeletal pain, prevalence rates, and sociodemographic associations in a Swedish population study
- 2001
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In: Journal of Rheumatology. - Toronto : Journal of Rheumatology Publishing Co. Ltd.. - 0315-162X .- 1499-2752. ; 28:6, s. 1369-1377
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Journal article (peer-reviewed)abstract
- OBJECTIVE: To estimate the prevalence of chronic regional and widespread musculoskeletal pain in a sample of the general adult population and study the association to age, sex, socioeconomic class, immigration, and housing area.METHODS: A cross sectional survey with a postal questionnaire to 3928 inhabitants on the west coast of Sweden.RESULTS: The age and sex adjusted prevalence of chronic regional pain (CRP) was 23.9% and chronic widespread pain (CWP) 11.4% among 2425 subjects who responded to the complete questionnaire. Odds ratio (OR) for CWP showed a systematic increasing gradient with age and was highest in the age group 59-74 yrs (OR 6.36, 95% CI 3.85-10.50) vs age group 20-34 yrs. CWP was also associated with female sex (OR 1.91, 95% CI 1.41-2.61), being an immigrant (OR 1.83, 95% CI 1.22-2.77), living in a socially compromised housing area (OR 3.05, 95% CI 1.48-6.27), and being an assistant nonmanual lower level employee (OR 1.92, 95% CI 1.09-3.38) or manual worker (OR 2.72, 95% CI 1.65-4.49) vs being an intermediate/higher nonmanual employee. OR for CRP showed a systematic increasing gradient with age and was highest in the age group 59-74 yrs (OR 2.22, 95% CI 1.62-3.05) vs age group 20-34 yrs. CRP was also associated with being a manual worker (OR 1.63, 95% CI 1.19-2.23) vs being an intermediate/higher nonmanual employee.CONCLUSION: Chronic musculoskeletal pain is common in the general population. Sociodemographic variables were overall more frequently and strongly associated with CWP than with CRP, which indicates different pathophysiology in the development or preservation of pain in the 2 groups.
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| 3. |
- Bilstrup, Urban, et al.
(author)
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A fault tolerance test enabling QoS in a Bluetooth piconet
- 2004
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Conference paper (pop. science, debate, etc.)abstract
- An important trend, in personal area networks, is that time critical application becomes more common, e.g., voice over IP, video phone calls, network games. This segment of applications demands for quality of service (QoS) guarantees, to provide the correct functionality. The Bluetooth standard provides an optional interface to support QoS guarantees, but the standard does not suggest any actual implementation. A wireless communication channel is stochastic by nature, providing QoS guarantees with this precondition make traditional deterministic real-time theory obsolete. In this paper a probabilistic fault tolerance test enabling quality of service guarantees in a Bluetooth piconet is given. The basic Bluetooth network architecture is based on a master-slave configuration, i.e., a point to point connection. More advanced network architectures are possible where up to eight Bluetooth equipped units can be active members of one network (piconet). Furthermore, several piconets can interconnect and form a so called scatternet.
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| 4. |
- Bilstrup, Urban, et al.
(author)
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Capacity limitations in wireless sensor networks
- 2003
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In: ETFA 2003. - Piscataway, N.J. : IEEE. - 0780379373 ; , s. 529-536
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Conference paper (peer-reviewed)abstract
- It is expected that wireless sensor network will be used in home automation and industrial manufacturing in the future. The main driving forces for wireless sensor networks are fault tolerance, energy gain and spatial capacity gain. Unfortunately, an often forgotten issue is the capacity limits that the network topology of a wireless sensor network represents. In this paper we identify gains, losses and limitations in a wireless sensor network, using a simplified theoretical network model. Especially, we want to point out the stringent capacity limitations that this simplified network model provide. Where a comparison between the locality of the performed information exchange and the average capacity available for each node is the main contribution.
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| 5. |
- Bilstrup, Urban, 1971-, et al.
(author)
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Knowledge Horizon - Dynamic limitations in a wireless ad hoc network
- 2003
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In: SNCNW 2003 Swedish National Computer Networking Workshop 2003 on-line proceedings. ; , s. 1-3
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Conference paper (peer-reviewed)abstract
- In this paper we investigate the impact of node mobility in a wireless ad hoc network (WAHN). Especially we investigate the possibility to provide guaranteed services in a WAHN, i.e., the network topology predictability. We combine link expiration time (LET) estimation with information propagation speed (IPS) in a time-space diagram and as result an operation area is revealed. The result gives that a WAHN, where the nodes are mobile, has a knowledge horizon (KH), the distance of which is dependent on the mobility of the nodes. Beyond the KH, knowledge about the network state is impossible to achieve. Thus, we can not predict long distance network topology state when the node mobility is high.
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| 6. |
- Bilstrup, Urban, et al.
(author)
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The use of clustered wireless multihop networks in industrial settings
- 2007
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In: ETFA 2007. - Piscataway, NJ : IEEE Press. - 9781424408252 ; , s. 211-218
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Conference paper (peer-reviewed)abstract
- This paper suggests a cluster collision avoidance mechanism and a dual transceiver architecture to be used in a clustered wireless multihop network. These two contributions make the clustered wireless multihop network the preferred architecture for future industrial wireless networks. The wireless multihop cluster consists of one master and several slaves, where some of the slaves will act as gateways between different clusters. Frequency hopping spread spectrum is used on a cluster level and to avoid frequency collisions between clusters a "neighbor cluster collision avoidance mechanism" is proposed and evaluated through simulations. To break up the dependence between the clusters, introduced by the gateway nodes, each node is equipped with two transceivers. The paper is concluded with a suggestion to use a clustered wireless multihop network with orthogonal hopping sequences for an industrial setting.
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| 7. |
- Bilstrup, Urban, et al.
(author)
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Using Dual-Radio Nodes to Enable Quality of Service in a Clustered Wireless Mesh Network
- 2006
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In: IEEE Conference on Emerging Technologies and Factory Automation, 2006. ETFA '06. - Piscataway, N.J. : IEEE Press. - 0780397584 ; , s. 54-61
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Conference paper (peer-reviewed)abstract
- In this paper some well established wireless technologies are merged into a new concept solution for a future industrial wireless mesh network. The suggested clustered wireless mesh network can handle probabilistic quality of service guarantees and is based on a dual-radio node architecture using synchronized frequency hopping spread spectrum Bluetooth radios. The proposed architecture gives a heuristic solution to the inter-cluster scheduling problem of gateway nodes in clustered architectures and breaks up the dependence between the local medium access schedules of adjacent clusters. The dual-radio feature also enables higher network connectivity, implying, for example, that a higher link redundancy can be achieved.
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| 8. |
- Collin, Sven-Olof, et al.
(author)
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Market Segmentation in Scientific Publications : Research Patterns in American vs European Management Journals
- 1996
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In: British Journal of Management. - Chichester : Wiley-Blackwell. - 1045-3172 .- 1467-8551. ; 7:2, s. 141-154
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Journal article (peer-reviewed)abstract
- Ideal science should conform to certain criteria or goals, among them the goals of universalism and commonality. Realization of these goals may be limited, however, through the dividing up of researchers in terms of geographical borders. In this study the general hypothesis is tested that there is a segmentation of the society of management researchers into a North American (US) and a European (E) segment, a segmentation which is furthered by differences in incentive schemes and in paradigms. Four leading management journals from North America and from Europe, respectively, and the 242 articles they contained published in 1993 were selected to represent the different geographical segments. The results provide: support for the existence of two such segments; support for differences in incentive schemes influencing the articles; support for their being paradigm differences between the two segments; and support for a paradigm effect being stronger in US-journals than in E-journals, US-authors are more willing, however, to conform to the E-paradigm than vice versa. We argue for methodological pragmatism in order to reduce the presumed counter-productive effects of paradigmatic rigidity.
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| 9. |
- Jormfeldt, Henrika
(author)
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Dimensions of Health among Patients in Mental Health Services
- 2007
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Doctoral thesis (other academic/artistic)abstract
- Empirical studies focusing on the subjective experience of health among patients in contact with the mental health services are rare and most questionnaires are based on a medical model that emphasizes objectively observed disease-oriented health indicators. In studies I and II perceptions of the concept of health among patients and nurses in mental health services were explored and described using a phenomenographic approach. The perceptions and description categories that emerged from these studies were transformed into a number of items forming a questionnaire intended to measure subjectively experienced health among patients in mental health services. In study III, a randomly selected sample was used to test the psychometric properties of the new Health Questionnaire. A factor analysis revealed three factors labelled Autonomy, Social Involvement and Comprehensibility. The purpose of study IV was to examine the construct validity of the Health Questionnaire. The hypothesis was that subjectively experienced health would be positively associated to self-esteem, empowerment and quality of life, and negatively associated to psychiatric symptoms, perceived stigmatization experiences and perceived attitudes of devaluation and discrimination. This hypothesis was mainly confirmed insofar that overall health was positively correlated to self-esteem, empowerment and quality of life and negatively correlated to symptoms, attitudes of devaluation and discrimination and rejection experiences. The results of this thesis show that health is more than just an absence of disease and support a focus on health promotion interventions in mental health care.
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| 10. |
- Kallner Bastviken, Sofia, et al.
(author)
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Effects of vegetation and hydraulic load on seasonal nitrate removal in treatment wetlands
- 2009
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In: Ecological Engineering. - Amsterdam : Elsevier. - 0925-8574 .- 1872-6992. ; 35:5, s. 946-952
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Journal article (peer-reviewed)abstract
- Optimising nitrate removal and identifying critical factors for nitrate removal in wetlands is an important environmental task in the effort to achieve better surface water quality. In this study, eighteen free water surface wetlands with similar shape and size (22 m2 each) received groundwater with a high nitrate-N concentration (about 11 mg l−1). The effects of two hydraulic loads, 0.13 m d−1 and 0.39 m d−1, and three vegetation types – emergent, submersed and freely developing vegetation – on the nitrate-N removal were investigated through mass inflow and outflow measurements.No significant difference in nitrate removal between the different hydraulic loads could be detected. Significantly higher area-specific nitrate removal and first-order area-based rate coefficients were found in the basins with emergent vegetation, with no difference between the basins with submersed and freely developing vegetation. The nitrate-N removal increased as the wetlands matured and the vegetation grew denser, emphasizing the role of dense emergent vegetation for nitrate removal at high nitrate concentrations.
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