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Power Rate Exponential Reaching Law for Enhanced Performance of Sliding Mode Control
Devika K. B.,Susy Thomas 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
In Sliding Mode Control (SMC), the control action can be split into two regions- the reaching phaseand the sliding phase. Considerable research attention has been given to improve the reaching time so as to bestutilize the benefit of robustness property of sliding mode motion. Attention has also been on alleviating and/oreliminating chattering during sliding mode motion so that smooth control is obtained which will not hinder practicalapplications. Exponential Reaching Law (ERL) is one of the methods reported in the literature for alleviatingchattering in sliding mode. This paper proposes a Power Rate Exponential Reaching Law (PRERL) wherebysubstantial improvement both in reaching time and chattering alleviation are achieved compared to ERL. WithERL, the states do not settle at its desired position due to high frequency low magnitude chattering, thus limitingits practical utility. This drawback has been overcome in the PRERL method. Thus the benefits of the proposedmethod is many fold: reducing reaching time, improving chattering alleviation and ensuring settling of the states atits final position with considerable improvement in speed of response.
Ilze Indriksone,Pauls Vitols,Viktors Avkstols,Linards Grieznis,Kaspars Stamers,Susy Linder,Michel Dard Korean Academy of Periodontology 2022 Journal of Periodontal & Implant Science Vol.52 No.3
Purpose: A novel attachment system for implant-retained overdentures (IRODs) with novel material combinations for improved mechanical resilience and prosthodontic success (Novaloc) has been recently introduced as an alternative to an existing system (Locator). This study investigated whether differences between the Novaloc and Locator attachment systems translate into differences in implant survival, implant success, and patient-centered outcomes when applied in a real-world in-practice comparative setting in patients restored with mandibular IRODs supported by 2 interforaminal implants (2-IRODs). Methods: This prospective, intra-subject crossover comparison compared 20 patients who received 2 intra-foraminal bone level tapered implants restored with full acrylic overdentures using either the Locator or Novaloc attachment system. After 6 months of function, the attachment in the corresponding dentures was switched, and the definitive attachment system type was delivered based on the patient's preference after 12 months. For the definitive attachment system, implant survival was evaluated after 24 months. The primary outcomes of this study were oral health-related quality of life and patient preferences related to prosthetic and implant survival. Secondary outcomes included implant survival rate and success, prosthetic survival, perceived general health, and patient satisfaction. Results: Patient-centered outcomes and patient preferences between attachment systems were comparable, with relatively high overall patient satisfaction levels for both attachment systems. No difference in the prosthetic survival rate between study groups was detected. The implant survival rate over the follow-up period after 24 months in both groups was 100%. Conclusions: The results of this in-practice comparison indicate that both attachment systems represent comparable candidates for the prosthodontic retention of 2-IRODs. Both systems showed high rates of patient satisfaction and implant survival. The influence of material combinations of the retentive system on treatment outcomes between the tested systems remains inconclusive and requires further investigations.
Ilze Indriksone,Pauls Vitols,Viktors Avkstols,Linards Grieznis,Kaspars Stamers,Susy Linder,Michel Dard 대한치주과학회 2023 Journal of Periodontal & Implant Science Vol.53 No.3
Purpose: A novel attachment system for implant-retained overdentures (IRODs) with novel material combinations for improved mechanical resilience and prosthodontic success (Novaloc) has been recently introduced as an alternative to an existing system (Locator). This study investigated whether differences between the Novaloc and Locator attachment systems translate into differences in implant survival, implant success, and patient-centered outcomes when applied in a real-world in-practice comparative setting in patients restored with mandibular IRODs supported by 2 interforaminal implants (2-IRODs). Methods: This prospective, intra-subject crossover comparison compared 20 patients who received 2 intra-foraminal bone level tapered implants restored with full acrylic overdentures using either the Locator or Novaloc attachment system. After 6 months of function, the attachment in the corresponding dentures was switched, and the definitive attachment system type was delivered based on the patient's preference after 12 months. For the definitive attachment system, implant survival was evaluated after 24 months. The primary outcomes of this study were oral health-related quality of life and patient preferences related to prosthetic and implant survival. Secondary outcomes included implant survival rate and success, prosthetic survival, perceived general health, and patient satisfaction. Results: Patient-centered outcomes and patient preferences between attachment systems were comparable, with relatively high overall patient satisfaction levels for both attachment systems. No difference in the prosthetic survival rate between study groups was detected. The implant survival rate over the follow-up period after 24 months in both groups was 100%. Conclusions: The results of this in-practice comparison indicate that both attachment systems represent comparable candidates for the prosthodontic retention of 2-IRODs. Both systems showed high rates of patient satisfaction and implant survival. The influence of material combinations of the retentive system on treatment outcomes between the tested systems remains inconclusive and requires further investigations.