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회전자의 과도한 온도 상승을 줄이는 PI형 PMSM 제어기 설계
도경훈(Gyeong-hun Do),최한호(Han Ho Choi) 제어로봇시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.2
This study considers the problem of designing a PI-type PMSM (permanent magnet synchronous motor) controller, which can prevent excessive temperature rise in the rotor. The problem was formulated as a nonlinear optimization problem, considering that the flux linkage of a PMSM depends on the rotor temperature value and can be estimated using the voltage input value. This study proposes a design procedure for solving the nonlinear optimization problem using the particle swarm optimization (PSO) algorithm, a metaheuristic search algorithm. Simulation studies using a practical PMSM model verified that the design problem can be successfully solved using a metaheuristic search algorithm.
유니버설조인트 시험방식을 이용한 치과용 임플란트의 피로시험 및 가속수명시험에 관한 연구
도경훈(Gyeong Hun Do),이석진(Seok Jin Lee),김종미(Jong Mi Kim),김성민(Sung Min Kim) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.1
Purpose : This paper is a comparative analysis results of the fatigue test for dental implants and accelerated life test by using a static type loading device commonly used in Korea and a dynamic type loading device (universal-joint) recommended by FDA. Methods : Fatigue tests of dental implant is based on ISO 14801 and classified into static load test and dynamic load test. The tests were carried out on three test specimens by four load stress steps under each loading device. For analysis on failure mode such as crack, fracture and permanent deformation of test specimens, we used X-ray three-dimensional computed tomography on test specimens before and after the fatigue tests. The design of the accelerated life test was based on the analysis results of the fatigue life data obtained from the dynamic load test and the statistical analysis software (Minitab ver.15) was used to analyze the appropriate life distribution. Results : As a result of the fatigue tests and the accelerated life tests at same acceleration condition under each test method, the fatigue life under the dynamic type loading device (universal-joint) was shorter than when static type loading device was applied. Conclusion : This paper can be used as a reference when the universal-joint type loading device for implants fatigue test is applied as ISO 14801.
기능 안전 관점에서의 의료기기 소프트웨어 신뢰성 평가 방법에 관한 연구
김성민(Sung Min Kim),고병각(Byeonggak Ko),도경훈(Gyeong-Hun Do),김혜진(Hye Jin Kim),함중걸(Jung-Keol Ham) 한국신뢰성학회 2016 신뢰성응용연구 Vol.16 No.3
Purpose: This paper suggests the procedure to enhance the reliability of the software of the medical device that is to cure, treat, diagnose, and prevent a disease or an abnormal health conditions. Methods: After test requirements are classified by the software requirements specification for safety and backgrounds, reliability assessment methods are suggested. Results: Verification and validation for function and safety can be performed whether the medical device software are implemented as intended. Conclusion: Procedure on the static analysis, unit test, integration test, and system test are provided for the medical device software.