Search for dissertations about: "Johan Hellgren"

Showing result 1 - 5 of 6 swedish dissertations containing the words Johan Hellgren.

  2. 1. Compensation for hearing loss and cancellation of acoustic feedback indigital hearing aids

    Author : Johan Hellgren; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The development of integrated circuits during the last decades has made it possible to incorporate digital signal processing in hearing aids that fit into the ear canal and are powered by small zink-air batteries. The digital signal processing provides new possibilities for the hearing aid to modify the signal to fit the impaired ear. READ MORE

  4. 2. Measuring transport quality in line-based road traffic

    Author : Johan Hellgren; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : .... READ MORE

  5. 3. Non-infectious rhinitis. Epidemiology and clinic

    Author : Johan Hellgren; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Non-infectious rhinitis; Paper dust; Asthma; Quality of life; Acoustic rhinometry;

    Abstract : We have assessed self-reported rhinitis in the absence of common cold, called "Non-infectious rhinitis", (NIR). The occurrence of NIR was investigated in a population sample of 2,044 individuals, aged 21-51, in an industrialised county in Sweden who answered a questionnaire relating to NIR and occupational exposure to potential irritants and sensitisers. READ MORE

  6. 4. A New Model for Assessment of Change in Visual Function in Diabetes

    Author : Karl-Johan Hellgren; Malmö Institutionen för kliniska vetenskaper; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; diabetic retinopathy; visual function; perimetry;

    Abstract : The purpose of this thesis was to determine whether perimetry using a new model to interpret deterioration or improvement in the visual field can be employed to assess change in visual function over time in diabetes. Diabetic retinopathy has long been considered a microvascular disease, but it is still a matter of debate to what extent diabetes also affects retinal neurons. READ MORE

  7. 5. Pediatric Obstructive Sleep Apnea : Evaluation of surgical treatments and immunological aspects

    Author : Isabella Sjölander; Danielle Friberg; Johan Hellgren; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Obstructive sleep apnea; pediatric sleep disordered breathing; tonsillar surgery; Polysomnography; adenotonsillotomy; adenotonsillectomy; Strength and Difficulties Questionnaire; OSA-18; Oto-Rhino-Laryngology; Oto-rhino-laryngologi;

    Abstract : Pediatric obstructive sleep apnea (OSA) is a sleep-related breathing disorder often caused by  enlargement of the adenoid and the tonsils. The peak prevalence is among children who are two to six years of age, when the lymphatic tissue is  most active. Clinical diagnosis can be challenging, since the symptoms are often unspecific. READ MORE