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- 저자 : Shota Higuchi (검색결과 2 건)
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Design of Two Degree of Freedom Controller Using Data Conversion Method
Shota Higuchi,Ryota Arimura,Chinthaka Premachandra,Kiyotaka Kato 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
Several data-driven design methods for a feedback controller for an unknown plant were studied. The data conversion method (DCM), which is one of the methods, has improved the design ability for more various plants by using a new approach. This paper applies the revised DCM to a two degree of freedom controller. First, the paper discusses a theory when applying DCM to a two degree of freedom controller. Then, it discusses the application of DCM to three structures of two degree of freedom controllers. Several experiments show that a controller can be directly designed from outline waveforms to a two degree of freedom controller. As a result, the paper shows that DCM is a convenient method for designing a two degree of freedom controller compared to conventional methods.
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Higuchi Shohei,Ikegami Shota,Oba Hiroki,Uehara Masashi,Kuraishi Shugo,Takizawa Takashi,Munakata Ryo,Hatakenaka Terue,Kamanaka Takayuki,Miyaoka Yoshinari,Koseki Michihiko,Mimura Tetsuhiko,Takahashi Jun 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.1
Study Design: Retrospective cohort study.Purpose: This study aimed to evaluate the relationship between C7 plumb line (C7PL) decompensation and the Scoliosis Research Society (SRS) 22-item patient questionnaire scores, including those related to self-image, preoperatively and 2 years after surgery.Overview of Literature: In the surgical treatment of adolescent idiopathic scoliosis (AIS), inferior trunk balance caused by C7PL decompensation can negatively affect patients’ quality of life. However, there are few reports in the literature that describe or clarify how postoperative trunk imbalance affects each SRS-22 domain, including self-image domain scores.Methods: A total of 120 patients with AIS who underwent posterior spinal fusion from August 2006 to March 2017 at our facility and were followed up for 2 years or more were included. Radiological parameters were measured on whole-spine anteroposterior and lateral radiographs. Revised SRS-22 (SRS-22r) values were also recorded. Coronal trunk imbalance was defined as a deviation of ≥2.0 cm between the C7PL and the central sacral vertical line. Patients with and without coronal trunk imbalance at 2 years after surgery were defined as D (+) (decompensation type) and D (-), respectively. Mean SRS-22r values, including function, pain, self-image, mental health, and subtotal were compared between the D (+) and D (-) groups. Logistic regression analysis was performed to detect the preoperative factors related to D (+) using predictors, including curve type, maximum Cobb angle, and coronal trunk imbalance.Results: At 2 years after surgery, the D (+) group had a significantly lower self-image in the domain of SRS-22r scores compared with the D (-) group. Preoperative coronal trunk imbalance was significantly related to D (+) but not to significant changes in the postoperative SRS-22 score in any of the SRS-22 domains.Conclusions: Postoperative C7PL deviation lowers the self-image in patients with AIS. Patients with preoperative coronal trunk imbalance were significantly more likely to be D (+).
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