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  • 1191701. Öhberg, F
    et al.
    Grip, Helena
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
    Nilsson, K-G
    Edström, U
    Gustavsson, O
    Häger, Charlotte
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
    Lundström, R
    Gait analysis using a portable motion sensor system: measurements in subjects with hip implants as compared with healthy controls2012Conference paper (Other academic)
  • 1191702.
    Öhberg, Fredrik
    University of Gävle, Centre for Musculoskeletal Research.
    Biomechanical methods and error analysis related to chronic musculoskeletal pain2009Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Background Spinal pain is one of humanity’s most frequent complaints with high costs for the individual and society, and is commonly related to spinal disorders. There are many origins behind these disorders e.g., trauma, disc hernia or of other organic origins. However, for many of the disorders, the origin is not known. Thus, more knowledge is needed about how pain affects the neck and neural function in pain affected regions. The purpose of this dissertation was to improve the medical examination of patients suffering from chronic whiplash-associated disorders or other pain related neck-disorders.

    Methods A new assessment tool for objective movement analysis was developed. In addition, basic aspects of proprioceptive information transmission, which can be of relevance for muscular tension and pain, are investigated by studying the coding of populations of different types of sensory afferents by using a new spike sorting method. Both experiments in animal models and humans were studied to accomplish the goals of this dissertation. Four cats where were studied in acute animal experiments. Mixed ensembles of afferents were recorded from L7-S1 dorsal root filaments when mechanical stimulating the innervated muscle. A real-time spike sorting method was developed to sort units in a multi-unit recording. The quantification of population coding was performed using a method based on principal component analysis. In the human studies, 3D neck movement data were collected from 59 subjects with whiplash-associated disorders (WAD) and 56 control subjects. Neck movement patterns were identified by processing movement data into parameters describing the rotation of the head for each subject. Classification of neck movement patterns was performed using a neural network using processed collected data as input. Finally, the effect of marker position error on the estimated rotation of the head was evaluated by computer simulations.

    Results Animal experiments showed that mixed ensembles of different types of afferents discriminated better between different muscle stimuli than ensembles of single types of these afferents. All kinds of ensembles showed an increase in discriminative ability with increased ensemble size. It is hypothesized that the main reason for the greater discriminative ability might be the variation in sensitivity tuning among the individual afferents of the mixed ensemble will be larger than that for ensembles of only one type of afferent. In the human studies, the neural networks had a predictivity of 0.89, a sensitivity of 0.90 and a specificity of 0.88 when discriminating between control and WAD subjects. Also, a systematic error along the radial axis of the rigid body added to a single marker had no affect on the estimated rotation of the head.

    Conclusion The developed spike sorting method, using neural networks, was suitable for sorting a multiunit recording into single units when performing neurophysiological experiments. Also, it was shown that neck movement analysis combined with a neural network could build the basis of a decision support system for classifying suspected WAD or other pain related neck-disorders.

  • 1191703.
    Öhberg, Fredrik
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Biomechanical methods and error analysis related to chronic musculoskeletal pain2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Background Spinal pain is one of humanity’s most frequent complaints with high costs for the individual and society, and is commonly related to spinal disorders. There are many origins behind these disorders e.g., trauma, disc hernia or of other organic origins. However, for many of the disorders, the origin is not known. Thus, more knowledge is needed about how pain affects the neck and neural function in pain affected regions. The purpose of this dissertation was to improve the medical examination of patients suffering from chronic whiplash-associated disorders or other pain related neck-disorders.

    Methods A new assessment tool for objective movement analysis was developed. In addition, basic aspects of proprioceptive information transmission, which can be of relevance for muscular tension and pain, are investigated by studying the coding of populations of different types of sensory afferents by using a new spike sorting method. Both experiments in animal models and humans were studied to accomplish the goals of this dissertation. Four cats where were studied in acute animal experiments. Mixed ensembles of afferents were recorded from L7-S1 dorsal root filaments when mechanical stimulating the innervated muscle. A real-time spike sorting method was developed to sort units in a multi-unit recording. The quantification of population coding was performed using a method based on principal component analysis. In the human studies, 3D neck movement data were collected from 59 subjects with whiplash-associated disorders (WAD) and 56 control subjects. Neck movement patterns were identified by processing movement data into parameters describing the rotation of the head for each subject. Classification of neck movement patterns was performed using a neural network using processed collected data as input. Finally, the effect of marker position error on the estimated rotation of the head was evaluated by computer simulations.

    Results Animal experiments showed that mixed ensembles of different types of afferents discriminated better between different muscle stimuli than ensembles of single types of these afferents. All kinds of ensembles showed an increase in discriminative ability with increased ensemble size. It is hypothesized that the main reason for the greater discriminative ability might be the variation in sensitivity tuning among the individual afferents of the mixed ensemble will be larger than that for ensembles of only one type of afferent. In the human studies, the neural networks had a predictivity of 0.89, a sensitivity of 0.90 and a specificity of 0.88 when discriminating between control and WAD subjects. Also, a systematic error along the radial axis of the rigid body added to a single marker had no affect on the estimated rotation of the head.

    Conclusion The developed spike sorting method, using neural networks, was suitable for sorting a multiunit recording into single units when performing neurophysiological experiments. Also, it was shown that neck movement analysis combined with a neural network could build the basis of a decision support system for classifying suspected WAD or other pain related neck-disorders.

  • 1191704.
    Öhberg, Fredrik
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    The effect of anisotropic systematic errors in estimating helical angles2008In: Computer Methods in Biomechanics and Biomedical Engineering, ISSN 1025-5842, E-ISSN 1476-8259, Vol. 11, no 2, p. 205-213Article in journal (Refereed)
    Abstract [en]

    A common question in movement studies is how the results should be interpreted with respect to systematic and random errors. In this study, simulations are made in order to see how a rigid body's orientation in space (i.e. helical angle between two orientations) is affected by (1) a systematic error added to a single marker (2) a combination of this systematic error and Gaussian white noise. The orientation was estimated after adding a systematic error to one marker within the rigid body. This procedure was repeated with Gaussian noise added to each marker.

    In conclusion, results show that the systematic error's effect on estimated orientation depends on number of markers in the rigid body and also on which direction the systematic error is added. The systematic error has no effect if the error is added along the radial axis (i.e. the line connecting centre of mass and the affected marker).

  • 1191705.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Bäcklund, Tomas
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    Sundström, Nina
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Grip, Helena
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Portable Sensors Add Reliable Kinematic Measures to the Assessment of Upper Extremity Function2019In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 5, article id 1241Article in journal (Refereed)
    Abstract [en]

    Ordinal scales with low resolution are used to assess arm function in clinic. These scales may be improved by adding objective kinematic measures. The aim was to analyze within-subject, inter-rater and overall reliability (i.e., including within-subject and inter-rater reliability) and check the system's validity of kinematic measures from inertial sensors for two such protocols on one person. Twenty healthy volunteers repeatedly performed two tasks, finger-to-nose and drinking, during two test sessions with two different raters. Five inertial sensors, on the forearms, upper arms and xiphoid process were used. Comparisons against an optical camera system evaluated the measurement validity. Cycle time, range of motion (ROM) in shoulder and elbow were calculated. Bland-Altman plots and linear mixed models including the generalizability (G) coefficient evaluated the reliability of the measures. Within-subject reliability was good to excellent in both tests (G = 0.80-0.97) and may serve as a baseline when assessing upper extremities in future patient groups. Overall reliability was acceptable to excellent (G = 0.77-0.94) for all parameters except elbow axial rotation in finger-to-nose task and both elbow axial rotation and flexion/extension in drinking task, mainly due to poor inter-rater reliability in these parameters. The low to good reliability for elbow ROM probably relates to high within-subject variability. The sensors provided good to excellent measures of cycle time and shoulder ROM in non-disabled individuals and thus have the potential to improve today's assessment of arm function.

  • 1191706.
    Öhberg, Fredrik
    et al.
    Department of Biomedical Engineering and Informatics, University Hospital, Umeå.
    Grip, Helena
    Department of Biomedical Engineering and Informatics, University Hospital, Umeå.
    Wiklund, Urban
    Department of Biomedical Engineering and Informatics, University Hospital, Umeå.
    Sterner, Ylva
    Community Medicine and Rehabilitation, University Hospital, Umeå, Sweden.
    Karlsson, J. Stefan
    Department of Biomedical Engineering and Informatics, University Hospital, Umeå.
    Gerdle, Björn
    Linköping University, Department of Clinical and Experimental Medicine, Rehabilitation Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Medicine, Pain and Rehabilitation Centre.
    Chronic Whiplash Associated Disorders and Neck Movement Measurements: An Instantaneous Helical Axis Approach2003In: IEEE transactions on information technology in biomedicine, ISSN 1089-7771, E-ISSN 1558-0032, Vol. 7, no 4, p. 274-282Article in journal (Refereed)
    Abstract [en]

    This paper presents an assessment tool for objective neck movement analysis of subjects suffering from chronic whiplash-associated disorders (WAD). Three-dimensional (3-D) motion data is collected by a commercially available motion analysis system. Head rotation, defined in this paper as the rotation angle around the instantaneous helical axis (IHA), is used for extracting a number of variables (e.g., angular velocity and range, symmetry of motion). Statistically significant differences were found between controls and subjects with chronic WAD in a number of variables.

  • 1191707.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    Grip, Helena
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Wiklund, Urban
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    Sterner, Ylva
    Karlsson, J Stefan
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Gerdle, Björn
    Chronic whiplash associated disorders and neck movement measurements: an instantaneous helical axis approach.2003In: IEEE transactions on information technology in biomedicine, ISSN 1089-7771, E-ISSN 1558-0032, Vol. 7, no 4, p. 274-282Article in journal (Refereed)
    Abstract [en]

    This paper presents an assessment tool for objective neck movement analysis of subjects suffering from chronic whiplash-associated disorders (WAD). Three-dimensional (3-D) motion data is collected by a commercially available motion analysis system. Head rotation, defined in this paper as the rotation angle around the instantaneous helical axis (IHA), is used for extracting a number of variables (e.g., angular velocity and range, symmetry of motion). Statistically significant differences were found between controls and subjects with chronic WAD in a number of variables.

  • 1191708.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Radiation Sciences.
    Johansson, H
    Umeå University, Faculty of Medicine, Integrative Medical Biology, Physiology.
    Bergenheim, M
    Umeå University, Faculty of Medicine, Integrative Medical Biology, Physiology.
    Pedersen, J
    Djupsjöbacka, M
    A neural network appoach to real-time spike discrimination during simultaneous recording from several multi-unit nerve filaments1996In: Journal of Neuroscience Methods, ISSN 0165-0270, E-ISSN 1872-678X, Vol. 64, no 2, p. 181-187Article in journal (Refereed)
    Abstract [en]

    A multi-channel, real-time, unsupervised spike discriminator was developed in order to reconstruct single spike trains from several simultaneously recorded multi-unit nerve filaments. The program uses a Self Organising Map (SOM) algorithm for the classification of the spikes. In contrast to previous similar techniques, the described method is made for use on a PC, and the method may thus be implemented at relatively low cost. In order to test the accuracy of the program, a robustness test was performed, where noise with different RMS levels was superimposed on the spikes. Furthermore, the maximal classification rate was determined. The program is easy to use, since the only manual inputs needed are the voltage threshold for spike detection, and the number of units present in each recorded nerve filament.

  • 1191709.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics. Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF).
    Lundström, Ronnie
    Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF). Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine.
    Grip, Helena
    Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF).
    Comparative analysis of different adaptive filters for tracking lower segments of a human body using inertial motion sensors2013In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 24, no 8, p. 085703-Article in journal (Refereed)
    Abstract [en]

    For all segments and tests, a modified Kalman filter and a quasi-static sensor fusion algorithm were equally accurate (precision and accuracy similar to 2-3 degrees) compared to normalized least mean squares filtering, recursive least-squares filtering and standard Kalman filtering. The aims were to: (1) compare adaptive filtering techniques used for sensor fusion and (2) evaluate the precision and accuracy for a chosen adaptive filter. Motion sensors (based on inertial measurement units) are limited by accumulative integration errors arising from sensor bias. This drift can partly be handled with adaptive filtering techniques. To advance the measurement technique in this area, a new modified Kalman filter is developed. Differences in accuracy were observed during different tests especially drift in the internal/external rotation angle. This drift can be minimized if the sensors include magnetometers.

  • 1191710.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Wadell, Karin
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
    Blomberg, Anders
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Claesson, Kenji
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Edström, Urban
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Holmner, Åsa
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Home-based system for recording pulmonary function and disease-related symptoms in patients with chronic obstructive pulmonary disease, COPD: a pilot study2016In: SM Journal of Pulmonary Medicine, ISSN 2574-240X, Vol. 2, no 1, article id 1011Article in journal (Refereed)
    Abstract [en]

    Introduction: Many patients with Chronic Obstructive Pulmonary Disease (COPD) suffer from acute exacerbations characterized by an increase in symptoms beyond normal day-to-day variation. The prognosis of patients with frequent exacerbations is poor and effort to curb these worsening episodes has great potential to improve the patient’s quality of life and to reduce associated costs. Telemonitoring has been proposed as a promising strategy in this respect. However, information on what physical signs or symptoms that should be recorded and how recorded data should be interpreted is largely missing in the literature.

    Methods: A new home-based system, based on a tablet computer, which can guide COPD patients to perform spirometry (inspiratory capacity, IC and forced expiratory volume in one and six seconds, FEV1 and FEV6) and record symptoms (COPD assessment test, CAT) was developed. The system was evaluated for 8-12 weeks in four patients with moderate to severe COPD with the aims to; i) assess the feasibility of the system to be used unsupervised by COPD patients and, ii) to evaluate the quality and ability of recorded parameters to reveal early signs of an exacerbation. Pearson bivariate correlation was performed between all outcome measures and descriptive information about inherent subject properties were presented.

    Results: The system was well accepted by all study subjects and the study generated a total of 253 measurements of which 94.5% were considered acceptable for analysis. One of the subjects developed an acute exacerbation towards the end of the study, whereas the other three subjects remained stable. Descriptive analysis of the data suggest that trends in the CAT score may indicate changes in health status and that IC tends to be more responsive to these changes compared to FEV1.

    Conclusion: The system developed in this study is well suited to be used unsupervised by COPD patients. Recorded data, in particular CAT, may be sensitive enough to detect early signs of an acute COPD exacerbation, although more data is needed to fully resolve the nature of such an association.

  • 1191711.
    Öhberg, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Zachrisson, Adam
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Holmner-Rocklöv, Åsa
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Three-Dimensional Camera System for Measuring Arm Volume in Women with Lymphedema Following Breast Cancer Treatment2014In: Lymphatic Research and Biology, ISSN 1539-6851, E-ISSN 1557-8585, Vol. 12, no 4, p. 267-274Article in journal (Refereed)
    Abstract [en]

    Background: Lymphedema is a common complication following breast cancer treatment, estimated to affect 20% of breast cancer survivors. The condition is associated with a number of symptoms, such as impaired range of motion and anxiety. A wide range of methods for determining the volume of the lymphedematous arm have been described. Circumference measurement (CM) is commonly used in clinics to appraise arm volume, while water displacement (WD) is often used in studies. The aim of the study was to assess the performance of a new method using 3D-technology in comparison to CM and WD. Methods and Results: The study was performed on 25 subjects with lymphedema secondary to breast cancer treatment. Volumetric data from CM, WD, and the 3D-camera were gathered on all subjects. The measurements were performed by two physiotherapists, each subject being measured by one of the physiotherapist. Estimates of differences between the methods was calculated through analyzing the data collected from the three methods using mixed-design analyses of variance. The results indicated a tendency for the 3D-camera to overestimate the volume in comparison the WD by 45.25 mL, 95% confidence interval (CI) -36.31 - 126.82 (p value 0.270). Conversely, CM showed a tendency to underestimate the volume compared to WD (-24.28 mL, CI -99.78 - 51.22, p value 0.521). Thus, no statistically significant difference was found between the methods. Conclusions: The 3D-camera is a viable method for measuring arm volume, performing on level with the established methods WD and CM.

  • 1191712.
    Öhberg, Helena
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Bång, Ulla
    Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden.
    Biological control of clover rot and red clover by Coniothyrium minitans under natural and controlled climatic conditions2010In: Biocontrol science and technology (Print), ISSN 0958-3157, E-ISSN 1360-0478, Vol. 20, no 1, p. 25-36Article in journal (Refereed)
    Abstract [en]

    The ability of Coniothyrium minitans, contained in the commercial product Contans®WG, to control the development of clover rot in red clover, Trifolium pratense, was for the first time investigated in the field. Studies were performed on an established ley with a grass-clover mixture and on a newly sown pure red clover ley, both at a field site naturally infested with Sclerotinia trifoliorum. In the latter experiment the biocontrol agent was applied either prior to sowing or to growing seedlings. In addition, the ability of sclerotia of two S. trifoliorum isolates to cause disease in detached leaves was studied in a controlled environment. The effect of Contans®WG treatments at temperatures between +5 and +15°C and incubation periods of up to 7 weeks were included. Application of the biocontrol agent to the established ley during early summer, significantly reduced the number of groups of apothecia that developed during autumn in the following year in treated plots, compared to untreated plots. Twice as many red clover plants of the cultivar SW Torun survived in the pure red clover stand experiment the year after Contans®WG application as in the untreated plots, irrespective of how the agent was applied. In the laboratory studies, administering biocontrol treatments to sclerotia significantly reduced disease scores in the detached leaves at all temperatures at an exposure time of 7 weeks. Shorter incubation periods did not always negatively affect sclerotial viability.

  • 1191713.
    Öhberg, L.
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Alfredson, H.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Neovascularisation in Achilles tendons with painful tendinosis but not in normal tendons2001In: Knee Surgery, Sports Traumatology, Arthroscopy, ISSN 0942-2056, Vol. 9, no 4, p. 233-238Article in journal (Refereed)
  • 1191714.
    Öhberg, L.
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Sclerosing therapy in chronic Achilles tendon insertional pain: results of a pilot study2003In: Knee Surgery, Sports Traumatology, Arthroscopy, ISSN 0942-2056, Vol. 11, no 5, p. 339-343Article in journal (Refereed)
  • 1191715.
    Öhberg, L.
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Lorentzon, R.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Alfredson, H.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Ultrasound guided sclerosis of neovessels in painful Achilles tendinosis: pilot study of a new treatment2002In: British Journal of Sports Medicine, ISSN 0306-3674, Vol. 36, no 3, p. 173-175Article in journal (Refereed)
  • 1191716.
    Öhberg, L
    et al.
    Umeå University, Faculty of Medicine, Radiation Sciences, Diagnostic Radiology. Umeå University, Faculty of Medicine, Surgical and Perioperative Sciences, Sports Medicine.
    Lorentzon, Ronny
    Umeå University, Faculty of Medicine, Surgical and Perioperative Sciences, Sports Medicine.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Surgical and Perioperative Sciences, Sports Medicine.
    Good clinical results but persisting side-to-side differences in calf muscle strength after surgical treatment of chronic Achilles tendinosis: a 5-year follow-up.2001In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 11, no 4, p. 207-212Article in journal (Refereed)
    Abstract [en]

    We have prospectively studied calf muscle strength (isokinetic concentric and eccentric muscle strength at 90 degrees/s and 225 degrees/s of angular velocity in 24 patients (17 males and 7 females, mean age 43.0 years) surgically treated for chronic Achilles tendinosis (at the 2-6 cm level in the tendon). The mean follow-up time was 5 years (range 31-82 months). Surgery was followed by immobilization in a weight-bearing below the knee plaster cast for 2-6 weeks, followed by a stepwise increasing strength training programme. Strength measurements (peak torque) were done preoperatively, and 1 and 5 (mean) years postoperatively. Preoperatively, concentric plantar flexion peak torque at 90 degrees/s and 225 degrees/s and eccentric plantar flexion torque at 90 degrees/s were significantly lower (12.3%, 19.7% and 8.5% respectively) on the injured side compared to the non-injured side. Postoperatively, at the 5-year follow-up, 22 out of 24 patients (92%) were satisfied with the operation and active at their desired level (running, tennis, badminton, walking). There was no significant increase in concentric and eccentric calf muscle strength postoperatively. Concentric plantar flexion peak torque at 90 degrees/s and 225 degrees/s and eccentric plantar flexion peak torque at 90 degrees/s were still significantly lower (7.2%, 8.6% and 8.8% respectively) on the injured side compared to the non-injured side. In conclusion it seems that the calf muscle strength deficit seen on the injured side preoperatively in this group of patients remains despite 92% of the patients being pain-free and active in sports or at recreational level after the operation. However, the percentage side-to-side difference is relatively low, and might not have any clinical relevance.

  • 1191717.
    Öhberg, Lars
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology. Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    The chronic painful Achilles tendon: sonographic findings and new methods for treatment2003Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The aim of the present thesis was to evaluate sonographic methods for investigation of the chronic painful Achilles tendon.

    In a prospective study on patients with chronic painful mid-portion Achilles tendinosis, grey-scale ultrasound (US) showed a decreased tendon thickness and a “normalized” structure in the majority of patients successfully treated with eccentric calf-muscle training. By combining US with colour Doppler examination (CDV), a neovascularisation was shown in the region with structural tendon changes in all painful tendons, but not in any of the pain-free normal tendons. In a small pilot study, the sclerosing agent Polidocanol was injected towards the neovessels under US and CDV guidance. The majority of the patients became painfree and had no remaining neovessels, while the patients with remaining pain had remaining neovessels. The combined findings from US, immuno-histochemical analyses of biopsies, and diagnostic injections, showed that the patients were temporarily pain-free after US and CDV guided injections of local anaesthesia towards the region with neovessels, and biopsies from the region with tendon changes and neovascularisation showed nerve structures in close relation to blood vessels. The presence of neovessels was shown also in patients with chronic pain in the Achilles tendon insertion, and it was found that treatment with sclerosing injections cured the pain in the majority of patients. A good result of treatment was associated with no remaining neovessels.

    In a prospective study on patients with chronic mid-portion Achilles tendinosis treated with eccentric training, CDV after treatment showed no remaining neovessels in the majority of the pain-free patients. In the patients with remaining tendon pain there were remaining neovessels. In conclusion, the findings in this thesis indicate that neovessels and accompanying nerves might be the source of chronic Achilles tendon pain. Sclerosing injections towards the neovessels, and eccentric training, seem to have a potential to cure the pain.

  • 1191718.
    Öhberg, Lars
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Effects on neovascularisation behind the good results with eccentric training in chronic mid-portion Achilles tendinosis?2004In: Knee Surgery, Sports Traumatology, Arthroscopy, ISSN 0942-2056, E-ISSN 1433-7347, Vol. 12, no 5, p. 465-470Article in journal (Refereed)
  • 1191719.
    Öhberg, Lars
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology.
    Lorentzon, Ronny
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Eccentric training in patients with chronic Achilles tendinosis: normalised tendon structure and decreased thickness at follow up2004In: Br J Sports Med, ISSN 0306-3674, Vol. 38, no 1, p. 8-11; discussion 11Article in journal (Refereed)
  • 1191720.
    Öhberg, Lars
    et al.
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology.
    Lorentzon, Ronny
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Eccentric training in patients with chronic Achilles tendinosis–normalized tendon structure and decreased thickness at follow-up2004In: British Journal of Sports Medicine, ISSN 0306-3674, E-ISSN 1473-0480, Vol. 38, no 1, p. 8-11Article in journal (Refereed)
    Abstract [en]

    Objective: To prospectively investigate tendon thickness and tendon structure by ultrasonography in patients treated with eccentric calf muscle training for painful chronic Achilles tendinosis located at the 2 6 cm level in the tendon.

    Methods: The patients were examined with grey scale ultrasonography before and 3.8 years ( mean) after the 12 week eccentric training regimen. At follow up, a questionnaire assessed present activity level and satisfaction with treatment.

    Results: Twenty six tendons in twenty five patients ( 19 men and six women) with a mean age of 50 years were followed for a mean of 3.8 years ( range 1.6 - 7.75). All patients had a long duration of painful symptoms ( mean 17.1 months) from chronic Achilles tendinosis before treatment. At follow up, 22 of 25 patients were satisfied with treatment and active in Achilles tendon loading activities at the desired level. Ultrasonography showed that tendon thickness ( at the widest part) had decreased significantly (p< 0.005) after treatment (7.6 (2.3) v 8.8 ( 3) mm; mean (SD)). In untreated normal tendons, there was no significant difference in thickness after treatment (5.3 (1.3) mm before and 5.9 (0.8) mm after). All tendons with tendinosis had structural abnormalities (hypoechoic areas and irregular structure) before the start of treatment. After treatment, the structure was normal in 19 of the 26 tendons. Six of the seven patients with remaining structural abnormalities experienced pain in the tendon during loading.

    Conclusions: Ultrasonographic follow up of patients with mid-portion painful chronic Achilles tendinosis treated with eccentric calf muscle training showed a localised decrease in tendon thickness and a normalised tendon structure in most patients. Remaining structural tendon abnormalities seemed to be associated with residual pain in the tendon.

  • 1191721.
    Öhberg, Lina
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Educational Sciences, Department of Education.
    Persson, Hanna
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Educational Sciences, Department of Education.
    Alla kan vara med!: En kvalitativ studie om vilka aspekter som påverkar anpassning av idrottsundervisning.2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1191722.
    Öhberg, Liselotte
    Stockholm University.
    Synthesis of a key derivative of glycosylphosphatidylinositol substances and synthesis of spacer glycosides for use in the formation of glycoconjugates and of self-assembled monolayer surfaces1998Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The first chapter of this thesis describes glycosylation strategies for obtaining derivatives of 2-amino-2-deoxy-a-D-glucopyranosyl-(1-->6)-D-myo-inositol, a key building block for synthesis of glycosylphosphatidylinositol anchor substances and also proposed to be part of a second messenger for insulin.

    The second chapter describes the synthesis of bifunctional oligoethylene glycol spacers and glycosylation of these for use in formation of glycoconjugates. Synthesis of glycosyl succinimides and their conversion into glycoconjugates are also described.

    In the third chapter, synthesis of various terminated alkane thiols are described for use in formation of self-assembled monolayer surfaces. Globotriose linked alkane thiols with or without oligoethylene glycol spacers in between were mixed with hydroxyl or oligoethylene glycol terminated alkane thiols for formation of model surfaces.

  • 1191723.
    Öhberg, Patrik
    KTH, Superseded Departments, Physics.
    Studies of inhomogeneous Bose-Einstein condensates1998Doctoral thesis, comprehensive summary (Other scientific)
  • 1191724.
    Öhberg, Sofie
    Mälardalen University, School of Health, Care and Social Welfare.
    Sjuksköterskors erfarenheter av suicidriskbedömning vid telefonrådgivning inom primärvården.2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Att utföra en suicidriskbedömning inom telefonrådgivning är en komplex arbetsuppgift som kräver erfarenhet och tyst kunskap. Trots flertalet utmaningar och upplevelse av otillräcklig kunskap utför ändå sjuksköterskorna dessa bedömningar. Syftet med denna studie är att belysa sjuksköterskors erfarenheter av suicidriskbedömning vid telefonrådgivning inom primärvården för att försöka förstå detta fenomen närmre. Studien är uppbyggt på en kvalitativ design med induktiv ansats. Datainsamlingen har skett via fem stycken semistrukturerade intervjuer som analyserats med hjälp av Graneheim och Lundmans (2004) kvalitativ innehållsanalys med en manifest ansats. I resultatet redovisas fem olika kategorier; Att uppleva utmaningar vid suicidriskbedömning inom telefonrådgivning, Att sträva efter ökad kunskap, Att beröras känslomässigt och uppleva otillräcklighet, Att kommunicera med patienten och Att uppleva tryggheter vid suicidriskbedömning inom telefonrådgivning. I resultatdiskussionen jämförs likheter och skillnad mellan tidigare forskning, men även ny information som författaren inte lyckats finna i tidigare forskning. Under metoddiskussionen redovisas tillförlitligheten i studien utifrån Graneheim och Lundmans (2004) kvalitativa innehållsanalys. Slutsatsen påvisar att sjuksköterskorna hanterar de upplevda utmaningarna bland annat genom stöd av kollegor och egna styrkor. Dock framkommer det en önskan om komptensfrämjande åtgärder och även förslag gällande detta.

  • 1191725.
    Öhberg, Sören
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Stadsbyggnadsförslag ur ett mikroklimatperspektiv: Kontinuitet i centrumaxeln Rådhusgatan, Stationsvägen - Köpmansgatan i Jakobstads centrum2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 1191726.
    Öhberg, Tomas
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Auto-tuning Hybrid CPU-GPU Execution of Algorithmic Skeletons in SkePU2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The trend in computer architectures has for several years been heterogeneous systems consisting of a regular CPU and at least one additional, specialized processing unit, such as a GPU.The different characteristics of the processing units and the requirement of multiple tools and programming languages makes programming of such systems a challenging task. Although there exist tools for programming each processing unit, utilizing the full potential of a heterogeneous computer still requires specialized implementations involving multiple frameworks and hand-tuning of parameters.To fully exploit the performance of heterogeneous systems for a single computation, hybrid execution is needed, i.e. execution where the workload is distributed between multiple, heterogeneous processing units, working simultaneously on the computation.

    This thesis presents the implementation of a new hybrid execution backend in the algorithmic skeleton framework SkePU. The skeleton framework already gives programmers a user-friendly interface to algorithmic templates, executable on different hardware using OpenMP, CUDA and OpenCL. With this extension it is now also possible to divide the computational work of the skeletons between multiple processing units, such as between a CPU and a GPU. The results show an improvement in execution time with the hybrid execution implementation for all skeletons in SkePU. It is also shown that the new implementation results in a lower and more predictable execution time compared to a dynamic scheduling approach based on an earlier implementation of hybrid execution in SkePU.

  • 1191727. Öhberg, Torbjörn
    Undersökning av transformationsmetoder2007Independent thesis Basic level (professional degree)Student thesis
  • 1191728.
    Öhberg, Torbjörn
    Karlstad University, Faculty of Social and Life Sciences.
    Undersökning av transformationsmetoder inom Ammenäs området, Uddevalla kommun2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    In the Ammenäs area within Uddevalla municipality there are some tensions/deviation between real estate boundaries that lies in the municipality database, and the boundary coordinates that are given from the GNSS-measure equipment, (despite that both systems are in RT90 7.5 gon V).

    The real estate boundaries that lies in the database has previously been translated from Uddevalla local system U38, to RT90 7.5 gon V, and the GNSS-equipment also uses

    RT90 7.5 gon V.

    To get a homogeneous and concordant coordinate system, control points and the real estate boundaries has to be transformed to the system that the GNSS-system uses (RT90 7.5 gon V).

    To get to the best result from a transformation method, I have tried a couple of transformation methods.

    When there are such big tensions as in this case the best way to get to a good result is to transform smaller areas instead of the whole area at once.

    When you have reached an acceptable accuracy in the boundary coordinates you can perform municipality measurement assignments with coordinates from the GNSS-equipment, which was the purpose with this examination.

  • 1191729. Öhborg, Anita
    Missionsverksamhet i Inre Mongoliet: en studie av Svenska Mongolmissionens verksamhet 1925-19452003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 1191730. Öhborg, Anita
    Svenska Mongolmissionen: en studie av missionsverksamheten i Mongoliet 1897 - 19252002Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1191731.
    Öhgren, Alexander
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Allmänintresse eller särintresse?: Nya planeringsideal & förändrad planeringsstyrnings påverkan på allmänintresset2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Offentligt styrd planering påstås ha mindre resurser än tidigare och förespråkas därför i allt större utsträckning samarbeta med näringsliv för att uppnå gemensamma mål om tillväxt, attraktivitet och konkurrens; samt för att mobilisera gemensamma resurser. Detta har beskrivits som att en maktförskjutning skett till näringslivets fördel. Förändringarna bidrar tillsammans till en annan uppfattning hur planeringen bör styra samhällsutvecklingen och vilka ändamål den ska verka för. Trots att gemensamma mål pekas ut mellan offentliga- och privata aktörer förutsätts fortfarande den offentliga sektorn tillgodose andra allmänna intressen. Men samarbeten mellan offentliga och privata aktörer innebär en risk för att näringslivets särintressen införlivas och dominerar allmänintresset.

    För att undersöka denna problematik genomförs en multipel fallstudie där förhållandet mellan byggherrar och kommun granskas i två detaljplanefall: Kilströms kaj i Karlskrona och Rosendalsfältet i Uppsala. Den förra planen ämnar uppföra attraktiva bostäder med spektakulär arkitektur för att skapa ett nytt landmärke, där byggherre och kommun diskuterat med varandra innan den formella planprocessen. Den senare är en omfattande detaljplan för bland annat 3 500 bostäder, nya skolor och universitetsbyggnader, där byggherrar kommit in mellan samråd och granskning genom markanvisningstävlingar. Som insamlingsmetoder har dokument och intervjuer använts och data har sedan brutits ned till teman utifrån governancebegrepp genom en kvalitativ analys.

    Planeringspraktiken analyseras genom att användandet av ett teoretiskt perspektiv som utgår från hur allmänintresset legitimeras, samt maktrelationer där makt främst ses som ett sätt att kontrollera språket. Utifrån studiens analys framkommer det att den beskrivna maktförskjutningen till näringslivets fördel kan nyanseras. Det är istället lokala maktrelationer som styr utfallet, där markägande är ett betydande styrmedel. Studien visar även att förhandlingsplanering som tidigare varit omstritt inte förefaller vara lika kontroversiellt längre utan anses i det närmaste vara en självklarhet. Förhandlingarna underlättas av att byggherrars särintressen många gånger sammanfaller med kommuners till följd av nya planeringsideal, exempelvis attraktiva bostäder; sätta staden på kartan etc. Det verkar således skett en förskjutning i allmänintresset: både kring vad som är eftersträvansvärt, men även i tillvägagångsättet som i allt större utsträckning verkar legitimeras utifrån dess effektivitet.

  • 1191732.
    Öhgren, Alexander
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Uppföljning och utvärdering av översiktsplanen i svenska storstadskommuner2014Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Denna uppsats syftar till att bidra med en bättre förståelse för hur uppföljning och utvärdering av översiktsplanen sker i praktiken. Vidare är syftet att föra en diskussion kring hur utvärderingen kan utvecklas. För att undersöka detta väljs Sveriges tre största kommuner (Stockholm, Göteborg och Malmö) ut, eftersom de har en ledande roll i svensk planering och troligtvis har mest resurser att tillgå för att bedriva utvärdering. Följande problemformulering används för att ta reda på syftet: Hur tillämpas uppföljning och utvärdering av översiktsplanen i svenska storstadskommuner? En bakgrund till vad som ingår i begreppen uppföljning och utvärdering görs inledningsvis, samt en redogörelse av olika typer av utvärdering. Även forskning kring utvärderingspraktiken samt svårigheter som finns med denna tas upp. Ambitionen med avsnittet är att presentera olika typer av utvärdering samt tidigare forskning i ämnet. Sedan väljs begreppen organisering, syfte och utvärderingsdesign ut som teoretiska utgångspunkter för att kunna beskriva hur kommunerna bedriver sin utvärdering av översiktsplanen. Därefter görs en kvalitativ innehållsanalys på kommunernas utvärderingsdokument där de teoretiska utgångspunkterna – med hjälp av frågor som baseras på dessa – styr genomgången av materialet. Det jag kom fram till i min studie var att samtliga undersökta kommuner genomför en utvärdering av översiktsplanen och att den är kopplad till aktualitetsprövningen. Utvärderingen tycks ske med interna utförare från den egna planeringsorganisationen, men en kommun (Göteborg) har utöver detta även anlitat externa. Översiktsplanen förefaller främst utvärderas utifrån om senare planering överensstämmer med översiktsplanens riktlinjer och mål. En möjlig utveckling av utvärderingsarbetet är att översiktsplanen bedöms utifrån om den har förbättrat senare planeringsbeslut. En annan utveckling skulle kunna vara att utvärderingen även involverar medborgare som får vara med och bedöma översiktsplanen.

  • 1191733. Öhgren, Andreas
    et al.
    Holmstöm, Fredrik
    CPT-sondering i sulfidlera: utvärdering av odränerad skjuvhållfasthet2002Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 1191734.
    Öhgren, Annika
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Developing an Ontology for Wood-related Industry: An Experience Report2004Report (Other academic)
    Abstract [en]

    Ontologies are widely used as a technique for representation and reuse of knowledge. This paper summarizes experiences and results of a project within ontology development, with wood-related industry as application sector. One major aspect of the project was the selection of a suitable methodology for ontology development. In a literature study existing methodologies were analyzed with respect to their suitability for small-scale application contexts. As no existing methodology was fully adequate, an improved methodology was proposed. The main intention was to reduce development time and effort to meet the demands of small-scale application contexts. The improved methodology was applied and evaluated in the project, i.e. in the development of an ontology for wood-related industry. The main conclusion is that the methodology was adequate for the project, but some aspects could be elaborated and further investigated, such as reuse of already existing ontologies.

  • 1191735.
    Öhgren, Annika
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Ontology Development and Evolution: Selected Approaches for Small-Scale Application Contexts2004Report (Other academic)
    Abstract [en]

    This report presents a literature study concerning three areas, Ontology Development Methodologies, Ontology Evolution, and Ontologies in Small and Medium-Sized Enterprises. The objectives were to find out and summarize what has been done so far in the different areas, as well as to find out what has not yet been done, and thereby discover new possible research areas. Ontologies are widely used as a technique for representation and reuse of knowledge. We believe that ontologies can be used in small and medium-sized enterprises and help companies by supporting knowledge sharing, reuse of knowledge, inter-operability, and much more. The main conclusion is that a lot of work has been put into Ontology Development, many methodologies are very mature and have been used in practice. Still, not all of them cover the aspects we are interested in, e.g. reuse of already existing ontologies and covering the whole life cycle. In Ontology Evolution, the main focus is on keeping an ontology and its dependents consistent, and it does not concern when to make changes, or what to actually change. Ontology use in small and medium-sized enterprises is not so common, but some experiences exist.

  • 1191736.
    Öhgren, Annika
    Linköping University, Department of Computer and Information Science, MDA - Human Computer Interfaces. Linköping University, The Institute of Technology.
    Towards an Ontology Development Methodology for Small and Medium-sized Enterprises2009Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis contributes to the research field information logistics. Information logistics aims at improving information flow and at reducing information overload by providing the right information, in the right context, at the right time, at the right place through the right channel.

    Ontologies are expected to contribute to reduced information overload and solving information supply problems. An ontology is created to form some kind of shared understanding for the involved stakeholders in the domain at hand. By using this semantic structure you can further build applications that use the ontology and support the employee by providing only the most important information for this person.

    During the last years, there has been an increasing number of successful cases in which industrial applications successfully use ontologies. Most of these cases however, stem from large enterprises or IT-intensive small or medium-sized enterprises (SME). The current ontology development methodologies are not tailored for SME and their specific demands and preferences, such as that SME prefer mature technologies, and show a clear preference for to a large extent standardised solutions. The author proposes a new ontology development methodology, taking the specific characteristics of SME into consideration. This methodology was tested in an application case, which resulted in a number of concrete improvement ideas, but also the conclusion that further specialisation of the methodology was needed, for example for a specific usage area or domain. In order to find out in which direction to specify the methodology a survey was performed among SME in the region of Jönköping.

    The main conclusion from the survey is that ontologies can be expected to be useful for SME mainly in the area of product configuration and variability modelling. Another area of interest is document management for supporting project work. The area of information search and retrieval can also be seen as a possible application field, as many of the respondents of the survey spend much time finding and saving information.

  • 1191737.
    Öhgren, Annika
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Do SME Need Ontologies?: Results from a Survey among Small and Medium-sized Enterprises2008In: Proceedings of the 10th International Conference on Enterprise Information Systems - ICEIS 2008, 2008Conference paper (Refereed)
    Abstract [en]

    During the last years, an increasing number of successful cases of using ontologies in industrial application scenarios have been reported, the majority of these cases stem from large enterprises. The intention of this paper is to contribute to an understanding of potentials and limits of ontology-based solutions in small and medium-sized enterprises (SME). The focus is on identifying application areas for ontologies, which motivate the development of specialised ontology construction methods. The paper is based on results from a survey performed among 113 SME in Sweden, most of them from manufacturing industries. The results of the survey indicate a need from SME in three application areas: (1) management of product configuration and variability, (2) information search and retrieval, and (3) management of project documents.

  • 1191738.
    Öhgren, Annika
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Information Overload in Industrial Enterprises - Results of an Empirical Investigation2008In: Proceedings of the 2nd European Conference on Information Management and Evaluation, Reading: Academic Publishing Limited , 2008, p. 343-350Conference paper (Refereed)
    Abstract [en]

    The work presented is part of the research field information logistics, which investigates and develops concepts and technologies for improving information flow in organisations. The intention of this paper is to contribute to an understanding of information management problems in enterprises, and also improvement potentials of current information systems. The paper presents results of a study focusing on information overload in industrial enterprises, an area that previously has attracted little academic attention. Two areas are investigated: is information overload perceived as a problem in enterprises, and which application areas of enterprise information management should be prioritised for improvement activities? The survey was sent to 436 enterprises in the South of Sweden, most of them small and medium-sized enterprises, and received 164 valid responses. The sample used for the paper includes industrial enterprises from manufacturing, construction, and electronics industries, which accounts for approximately 80% of the responses.When analysing the data from the study, the paper follows the opinion of various scholars in the field that the complexity of an application case is an essential parameter to take into account when deciding on improvement potential. The more complex the application scenario is, the more likely is the usefulness of IT solutions for improving information flow. Research on complexity of projects proposes to define complexity as “consisting of many varied interrelated parts”, to distinguish between organisational and technological complexity, and to operationalise this in terms of “differentiation and interdependence”.One result of the study is a clear indication that information overload is perceived as a problem in industrial enterprises, which surfaces in problems such as finding the right information needed for a work task, and in the time needed to structure and store information. Furthermore, the results indicate two application areas that offer improvement potential: information management with focus on search and retrieval, and management of product information.

  • 1191739.
    Öhgren, Annika
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Towards a Methodology for Ontology Development in Small and Medium-Sized Enterprises2005In: IADIS Conference on Applied Computing, Algarve, Portugal, February 2005., 2005Conference paper (Other (popular science, discussion, etc.))
  • 1191740.
    Öhgren, C
    SIK – Institutet för livsmedel och bioteknik.
    Smakliga rätter för ökad konsumtion av nyttiga vegetabilier : slutrapport2010Report (Other academic)
  • 1191741.
    Öhgren, C
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Lorén, N
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Altskär, Annika
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Hermansson, A.-M.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Surface-directed structure formation of β-lactoglobulin inside droplets2011In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 12, no 6, p. 2235-2242Article in journal (Refereed)
    Abstract [en]

    The morphology of β-lactoglobulin structures inside droplets was studied during aggregation and gelation using confocal laser scanning microscopy (CLSM) equipped with a temperature stage and transmission electron microscopy (TEM). The results showed that there is a strong driving force for the protein to move to the interface between oil and water in the droplet, and the β-lactoglobulin formed a dense shell around the droplet built up from the inside of the droplets. Less protein was found inside the droplets. The longer the β-lactoglobulin was allowed to aggregate prior to gel formation, the larger the part of the protein went to the interface, resulting in a thicker shell and very little material being left inside the droplets. The droplets were easily deformed because no network stabilizes them. When 0.5% emulsifier, polyglycerol polyresinoleat (PGPR), was added to the oil phase, the β-lactoglobulin was situated both inside the droplets and at the interface between the droplets and the oil phase; when 2% PGPR was added, the β-lactoglobulin structure was concentrated to the inside of the droplets. The possibility to use the different morphological structures of β-lactoglobulin in droplets to control the diffusion rate through a β-lactoglobulin network was evaluated by fluorescence recovery after photobleaching (FRAP). The results show differences in the diffusion rate due to heterogeneities in the structure: the diffusion of a large water-soluble molecule, FITC-dextran, in a dense particulate gel was 1/4 of the diffusion rate in a more open particulate β-lactoglobulin gel in which the diffusion rate was similar to that in pure water.

  • 1191742.
    Öhgren, Camilla
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience, Structure Design.
    Fabregat, Nieves
    RISE, SP – Sveriges Tekniska Forskningsinstitut. SLU Swedish University of Agricultural Sciences, Sweden.
    Langton, Maud
    SLU Swedish University of Agricultural Sciences, Sweden.
    Quality of bread baked from frozen dough - effects of rye, and sugar content, kneading time and proofing profile2016In: Lebensmittel-Wissenschaft + Technologie, ISSN 0023-6438, E-ISSN 1096-1127, Vol. 68, p. 626-633Article in journal (Refereed)
    Abstract [en]

    The objectives of this study were to evaluate whether proofing profile influences volume and crumb firmness in bread baked from frozen dough, and whether rye or sugar content and different kneading times affect the microstructure of the frozen dough. Microscopy was used to explain the differences.Wheat doughs mixed with rye ("rye") and with sugar ("sweet") were frozen after 3 different proofing times (0, 18, and 38 min) and visualized with confocal laser scanning microscopy and 3-dimensional micro-computed tomography. The baked breads were evaluated for volume and texture. Breads from un-proofed frozen dough allowed to proof after thawing showed the highest volume (4.0 cm3/g) and the softest crumb texture. The pre-proofed sweet bread had firmer crumbs and lower volume (2.5-3.0 cm3/g) than the pre-proofed rye bread (2.7-3.7 cm3/g). Reasons for the differences in quality parameters between the rye and sweet breads were investigated by studying the different influences of kneading time and sugar content on fresh and frozen dough. The gluten network was found to be more homogeneously distributed in doughs with longer kneading times and lower sugar content, and less well distributed and more lumped in frozen than in fresh dough.

  • 1191743.
    Öhgren, Camilla
    et al.
    SIK – Institutet för livsmedel och bioteknik.
    Langton, Maud
    SIK – Institutet för livsmedel och bioteknik.
    Hermansson, Ann-Marie
    SIK – Institutet för livsmedel och bioteknik.
    Structure-fracture measurements of particulate gels2004In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 39, no 21, p. 6473-6482Article in journal (Refereed)
    Abstract [en]

    Images on a micron scale and the stress-strain behaviour of gel structures during tension were simultaneously recorded in real time using a mini fracture cell under the confocal laser scanning microscope (CLSM). ?-lactoglobulin gels tailor-made to vary in density, connectivity, thickness of strands and size of aggregates and clusters were used as a food model system. Amylopectin and gelatin were used to generate different types of ?-lactoglobulin network microstructures and also as a second continuous phase. Both rheological and structural differences in fragility between ?-lactoglobulin gels were verified according to the density of their aggregated network structure. A dense gel has a more brittle behaviour where the clusters are rigid and the crack propagates smoothly compared to a gel with an open network structure, which has a discontinuous crack growth, via a winding pathway around clusters, and also break-up of the pores far from the crack tip. Differences in the stretchability of the aggregated ?-lactoglobulin structure, induced by addition of amylopectin solution, were proved and related to differences in stress-strain behaviour and crack propagation. Gelatin gels in the pores between the ?-lactoglobulin clusters do not affect the structure of the ?-lactoglobulin network but make the fracture fragile giving a smooth fracture surface, cause continuous crack growth and fracture propagation through ?-lactoglobulin clusters. This is a consequence of that the mixed gel follows the behaviour of the gelatin gel when the gelatin phase is stronger than the ?-lactoglobulin network. © 2004 Kluwer Academic Publishers.

  • 1191744.
    Öhgren, Camilla
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Loren, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Altskär, Annika
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Hermansson, Ann-Marie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Surface-directed structure formation of beta-lactoglobulin inside droplets2011In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 12, no 6, p. 2235-2242Article in journal (Refereed)
    Abstract [en]

    The morphology of ?-lactoglobulin structures inside droplets was studied during aggregation and gelation using confocal laser scanning microscopy (CLSM) equipped with a temperature stage and transmission electron microscopy (TEM). The results showed that there is a strong driving force for the protein to move to the interface between oil and water in the droplet, and the ?-lactoglobulin formed a dense shell around the droplet built up from the inside of the droplets. Less protein was found inside the droplets. The longer the ?-lactoglobulin was allowed to aggregate prior to gel formation, the larger the part of the protein went to the interface, resulting in a thicker shell and very little material being left inside the droplets. The droplets were easily deformed because no network stabilizes them. When 0.5% emulsifier, polyglycerol polyresinoleat (PGPR), was added to the oil phase, the ?-lactoglobulin was situated both inside the droplets and at the interface between the droplets and the oil phase; when 2% PGPR was added, the ?-lactoglobulin structure was concentrated to the inside of the droplets. The possibility to use the different morphological structures of ?-lactoglobulin in droplets to control the diffusion rate through a ?-lactoglobulin network was evaluated by fluorescence recovery after photobleaching (FRAP). The results show differences in the diffusion rate due to heterogeneities in the structure: the diffusion of a large water-soluble molecule, FITC-dextran, in a dense particulate gel was 1/4 of the diffusion rate in a more open particulate ?-lactoglobulin gel in which the diffusion rate was similar to that in pure water. © 2011 American Chemical Society.

  • 1191745.
    Öhgren, Ellenore
    et al.
    Umeå University, Faculty of Social Sciences, Department of applied educational science.
    Nyberg, Jenny
    Umeå University, Faculty of Social Sciences, Department of applied educational science.
    Pedagogers erfarenheter av barn som uppvisar stress i skolan2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Stress kan bero på flera faktorer, det kan visa sig olika beroende på ålder. Vuxnas förhållningssätt kan påverka barns stress. Syftet med föreliggande studie är att undersöka och skapa kunskap om pedagogers erfarenheter av arbetet med barn som uppvisar stress. Vi ville få kunskaper om hur skolor behandlar detta ständigt aktuella ämne. Följande forskningsfrågor besvaras: Vilken erfarenhet har pedagogerna av elever som uppvisar stress i skolan? Hur arbetar pedagoger och skola med barn som uppvisar stress? Via en kvalitativ intervjustudie har kunskaper inhämtats om pedagogers erfarenheter i arbetet med barn som uppvisar stress. Resultatet visar att stress kan vara likt en NPF samt bero på flera bakomliggande faktorer. Pedagogers agerande kan påverka barns stress.

  • 1191746.
    Öhgren, Evelina
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Projekt Nalovardo: Underlag till MKB för detaljplan samt ett förslag till resurshushållning i samband med byggandet av fritidshus2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report has two main aims; one purpose is to investigate the environmental implications of an exploitation of 75 holiday houses located in Nalovardo in northern Sweden. The other aim is to present suggestions on how the area and the holiday houses can be built and designed to conserve natural resources. To answer the first aim a base for an environmental impact assessment regarding the local plan for holiday houses in Nalovardo were established. A literature study was then made in order to present suggestions to conserve natural resources when constructing holiday houses in Nalovardo. The landscape image, water and sewer are interests that will be affected due to the exploitation of the area. The exploitations site is not located in an environmental protected area. The holiday houses would generate a greater interest in visiting nature reserves, tourism, ski resort and outdoor activities and this should be seen as something positive. To conserve natural resources in a building depends much on individual behavior and choice of products. What the constructer of the building in Nalovardo project can do is mainly to make demands on the resource measures concerning heat and cold in the houses.

  • 1191747.
    Öhgren, Evelina
    et al.
    Umeå University, Faculty of Social Sciences, Department of Sociology.
    Iassu, Jenny
    Umeå University, Faculty of Social Sciences, Department of Sociology.
    Unga kvinnor inom mansdominerade yrken: En kvalitativ studie om sex stycken kvinnors upplevelser, erfarenheter och känslor i deras nuvarande eller blivande arbete inom ett mansdominerat yrke efter avslutande studier.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats undersöker sex stycken kvinnors upplevelser, erfarenheter och känslor i deras nuvarande eller blivande arbete inom mansdominerade yrken efter avslutande studier. Syftet i denna studie är att få fördjupad kunskap om vilka faktorer som avgjorde valet av yrke, vilka reaktioner det fanns från närstående, vilka upplevelser de har av att ha arbetat inom ett mansdominerat yrke, samt hur deras framtidsplaner inom yrket ser ut. Denna studie är kvalitativ då vi intervjuade sex kvinnor i åldrarna 20–29 år. I intervjuerna framgick det att hälften av informanterna inte ser sig arbeta inom samma yrke om några år, detta kanske på grund utav det nuvarande individualistiska samhället som präglar människan med flertalet valmöjligheter. Med utgångspunkt i denna uppsats så bör framtida forskning undersöka fler och andra mansdominerade yrken än måleri, el, och lantbruk som undersöktes i denna studie. Det skulle vara intressant att få en djupare kunskap om varför de vill byta yrke samt om deras förväntningar de hade om yrket överensstämde med hur verkligheten faktiskt såg ut. För att kunna dra generella slutsatser bör en större studie genomföras med fler informanter för att uppnå högre reliabilitet dock så styrker andra studier resultatet.

  • 1191748.
    Öhgren, Jan
    Stockholm University, Faculty of Law, Department of Law.
    Styrelsens lojalitetsplikt och självkontrahering: en jämförelse mellan USA och Sverige2015Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 1191749.
    Öhgren, Jenny
    Stockholm University, Faculty of Law, Department of Law.
    Avstängning från arbetslöshetsersättning på grund av eget förorsakande av anställningens upphörande2014Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1191750.
    Öhgren, Jens
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Media and Communication Science.
    Johansson, Catrin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Media and Communication Science.
    Sociala intranät för kommunikation och lärande: En studie av Svenska Spels intranät Hemmaplan2014Report (Other academic)
    Abstract [sv]

    Sociala medier har blivit ett allt vanligare verktyg för internkommunikation i organisationer, men kunskapen om vilka konsekvenser, risker och möjligheter som sociala intranät medför är hittills begränsad. Forskning visar att sociala medier låter användareuttrycka sig och bidrar till effektivare kommunikation, förbättrade samarbeten, ökadtransparens och minskade hierarkier. Med denna studie ämnar vi undersöka vilken nytta sociala intranät skapar utifrån hur användare uppfattar dess värde, inverkan på organisationskulturen, samt vilka kommunikativa problem som eventuellt skapas och klaras upp.För att uppfylla studiens syfte har vi genom fokusgruppintervjuer och en webbenkät undersökt medarbetares och chefers uppfattningar om Svenska Spels intranät Hemmaplan. Resultatet visar att olika användare uppfattar och använder intranätet på olika sätt. Ifokusgruppintervjuerna visade det sig att vissa användare ser intranätet som ett kommunikationsverktyg som underlättar interaktionen med kollegor och delaktighet i organisationen, medan andra främst ser intranätet som en informationskälla. Detta styrks av enkätundersökningen, som även visade att vissa användare vill att det händer mycket på intranätet och att det ska finnas mycket information tillgänglig. De vill självakunnabestämma vad de vill läsa om och ta del av. Andra användare föredrar ett snabb-konsumerat intranät som har lättillgänglig, kvalitativ och relevant information, vilket visade sigbåde i fokusgruppintervjuerna och i webbenkäten.De slutsatser vi kandra från undersökningenär att respondenterna överlag ser de sociala attributen i intranätet som mer positiva än negativa. De beskriver att intranätet gjort användarna, såväl medarbetare som chefer,mer synliga och att det förs en bättre dialog inom organisationen.Att överlåta mycket kontroll och ansvar till redaktörer ute i organisationen har varit lyckat och gjort att Svenska Spel har kommit en bra bit på vägen för att göra intranätet till ett verktyg för dialog och meningsskapande i organisationen. DetSvenska Spelframför allt bör fokusera på i fortsättningen är att öka engagemanget bland chefer och redaktörer för att ytterligare förstärka de positiva effekter Hemmaplan ger i organisationen.De viktigaste rekommendationerna till Svenska Spel är:•Tydliggör syftet med Hemmaplan och tanken med de olika funktionerna. •Gör ett vägval när det gäller privat ellerarbetsrelaterat innehåll. •Skapa översikter och rubriker för de som har svårt att överblicka innehållet.•Ge viktig information en speciell plats.•Skapa utrymme för enhets- och avdelningsinformation. •Lägg in mer information om mål, resultat och medarbetare.•Kartlägg behoven av Hemmaplan hos Kasinopersonalen.•Uppmuntra kritiska synpunkter. •Möjliggör personlig anpassning av startsidan.

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