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박민기 서울産業大學校 2000 논문집 Vol.51 No.2
In this paper, a new accurate model for elastic deformation is proposed to provide sufficient realism in virtual force feedback. The modeling technique selected in this paper is based on the fruzzy model to describe a nonlinear elastic deformation. It is shown that the proposed method is useful for the elastic deformation modeling by simulation.
박민기,박민용 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.9
In this paper, a new method is proposed where the vision and ultrasonic sensor are used to recognize obstacles and to obtain its position and size. Ultrasonic snsors are used to obtain the actual navigation path width of the mobile robot. In conjunction with camera images of the path, recognition of obstacles and the determination of its distance, direction, and width are carried out. The characteristics of the sensors and the mobile robots used generally make it difficult to recognize all environments; accordingly, a restricted environment is employed for this study.
X-Band SiGe HBT MMIC Quadrature 전압제어발진기 설계
박민기,김창우 경희-다반 ASIC 설계교육센터 2004 경희-다반 ASIC센터 논문집 Vol.5 No.-
X-Bnad 대역의 송수신기에 응용될 수 있는 quadrature 전압제어발진기를 SiGe HBT를 이용하여 설계하였다. 설계된 전압제어발진기는 8 GHz의 중심주파수에서 5.4 dBm의 출력 레벨특성을 나타내었다. 0.5 V에서 2.5 V의 튜닝전압 변화시 620 MHz의 튜닝주파수 범위를 가지며, 최대 출력 5 dBm애서 1.5 dB의 출력전력의 차를 내타내었다. 과리초 1 MHz offset에서 -107 dBc/Hz의 위상잡음 특성을 나타내었다. 버퍼를 포함한 총 소모 전류는 동작 전압 3 V에서 26 mA이다.
박민기 서울産業大學校 1996 논문집 Vol.44 No.1
The self-excited oscillation is the phenomenon which can be observed in the systems composed of nonlinear elements. The phenomenon is of fundamental importance in nonlinear systems and as far as the design of a nonlinear system is concerned it should be considered along with the stability analysis. In this paper, the oscillation of a system controlled by a static nonlinear fuzzy controller is theoretically addressed. First, a simple structure of a fuzzy controller is assumed for analysis and its describing function is derived to analyze the self-excited oscillation. Computer simulation is included to show an example where the analysis given in the paper is used to predict the self-excited oscillation of a fuzzy controlled system.
Fault Current Limiting and Magnetizing Characteristics of the Autotransformer Type SFCL
박민기,임성훈 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
In designing the autotransformer type superconducting fault-current limiter (SFCL), one must consider that the ironcore can be saturated for the SFCL to have effective fault-current limiting operation. In this paper, to examine thesaturation of the iron core comprising SFCL during the fault period, the linkage flux and the magnetizing current ofthe SFCL were derived from the electrical equivalent circuit with the nonlinear exciting branch. By analysis on thelinkage flux versus the magnetizing current of the autotransformer type SFCL, calculated from the short-circuit tests,the design condition for the suppression of the iron core’s saturation was discussed.
박민기 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.1
Multicopters have become more popular since they are advantageous in their ability to take off and land vertically. Inorder to guarantee the normal operations of such multicopters, the problem of fault detection and isolation is veryimportant. In this paper, a new method for detecting and isolating an actuator fault of a hexacopter is proposed based onthe analytical approach. The residual is newly defined using the angular velocities of actuators estimated by themathematical model and an actuator fault is detected comparing the residuals to a threshold. And a fault is isolatedcombining a dynamic model and generated residuals when a fault is detected. The proposed method is a simple, buteffective technique because it is based on mathematical model. The results of the computer simulation are also given todemonstrate the validity of the proposed algorithm in case of a single failure. 멀티콥터는 수직 이착륙 할 수 있다는 장점 때문에 활용이 증가하고 있으며 이러한 멀티콥터의 정상적인 동작을 위해서는고장 검출과 분리 문제가 매우 중요하다. 본 논문에서는 해석적 방법에 기반하여 헥사콥터 구동기의 고장을 검출하고 분리하는 새로운 방법을 제안한다. 제안한 방법에서는 헥사콥터의 수학적 모델로부터 추정한 구동기의 각속도를 이용하여 잔차를새롭게 정의하고 생성된 잔차와 문턱값을 비교하여 구동기의 고장을 검출한다. 고장이 검출되면 헥사콥터의 동역학 모델과생성된 잔차를 결합하여 고장을 분리한다. 제안한 방법은 수학적 모델을 기반으로 하여 간단하면서도 효과적이다. 헥사콥터구동기의 단일 고장 상황을 가정한 시뮬레이션을 통해 제안한 방법의 유효성을 검증하였다.