• 재활복지공학회논문지
• /
• 제10권1호
• /
• pp.59-64
• /
• 2016

본 연구에서는 기능적 전기 자극에 필요한 전기 자극 파형(Wave Form)과 Therapy, Burst, Pulse 각 구간에 필요한 전기 자극 시간과 같은 매개변수를 그래프 형식으로 시뮬레이션하고, 환자에게 전달되는 전기 에너지를 계산할 수 있도록 하는 기능적 전기 자극 시뮬레이션 응용프로그램을 개발하였으며, 개발된 시뮬레이션 응용프로그램과 전기 자극 장비에서 출력되는 전기 자극을 오실로스코프를 통해 비교 검증하였다. 응용프로그램에서 시뮬레이션 한 프로그램의 콘텐츠를 활용하기 위하여 XML 스키마를 개발하였다. 그리고 각각의 설정 값들에 대해 표준화된 코드를 이용하고 OID를 이용하여 각각의 표준화 코드들을 식별 할 수 있도록 함으로써 의료전문가들 사이에서 기능적 전기 자극 프로그램에 대한 콘텐츠 공유의 도구로 활용할 수 있도록 하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
• /
• pp.1467-1470
• /
• 1987

This paper proposes a functional simulation algorithm which decrease the internal memory space and run time in simulation of VLSI. Flip-flop, register, ram, rom, ic and fun are described as functional elements in the simulator. Especially icf is made as new functional element by combining the gate and the functional element, therefore icf is used efficiently in simulation of VLSI. The proposed algorithm is implemented on PC-AT(MS-DOS) in by Prolog-1.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1999년도 하계학술대회 논문집 B
• /
• pp.656-658
• /
• 1999

This paper presents musculotendon model to show the decline in muscle force during functional electrical stimulation (FES). It represent muscle activation and contraction concepts including muscle fatigue. A muscle fatigue term in activation dynamics as a function of the intracellular acidification and the pulsewidth of stimulation pulses change activation to decline muscle force. The computer simulation shows that muscle force decline in stimulation time.

• Journal of Electrical Engineering and Technology
• /
• 제9권3호
• /
• pp.848-858
• /
• 2014

In this paper the construction of a model that represents the behavior of an Electric Vehicle is described. Both the mechanical and the electric traction systems are represented using Multi-Bond Graph structural approach suited to model large scale physical systems. Then the model of the controllers, represented with a functional approach, is included giving rise to an integrated model which exploits the advantages of both approaches. Simulation and experimental results are aimed to illustrate the electromechanical interaction and to validate the proposal.

• Ocean Systems Engineering
• /
• 제2권2호
• /
• pp.83-97
• /
• 2012

In the present work, design procedure and computer simulation of an AUV are documented briefly. The design procedure containing the design of propulsion system and CFD simulation of hydrodynamics behavior of the hull leads to achieve an optimum mechanical performance of AUV system. After designing, a comprehensive one dimensional model including motor, propeller, and AUV hull behavior simulates the whole dynamics of AUV system. In this design, to select the optimum AUV hull, several noses and tails are examined by CFD tools and the brushless motor is selected based on the first order model of DC electrical motor. By calculating thrust and velocity in functional point, OpenProp as a tool to select the optimum propeller is applied and the characteristics of appropriate propeller are determined. Finally, a computer program is developed to simulate the interaction between different components of AUV. The simulation leads to determine the initial acceleration, final velocity, and angular velocity of electrical motor and propeller. Results show the final AUV performance point is in the maximum efficiency regions of DC electrical motor and propeller.

• 대한전자공학회논문지
• /
• 제25권10호
• /
• pp.1252-1262
• /
• 1988

본 논문은 여러 가지 그래픽스 시스템에서 사용될 수 있는 GP(graphics & processor)의 기능적 설계와 검증에 대해 기술한다. GP는 두 부분으로 나뉘어지는데 하나는 CPU이고 다른 하나는 입출력 기능을 담당하는 부분이다. 그래픽스 명령어를 빨리 수행하기 위해 CPU는 특별한 연산기와 배럴 쉬프터 및 윈도우 비교기를 가지고 있으며 명령어를 미리 읽어오기 위한 FIFO도 가지고 있다. 입출력 부분은 GP의 국소 메모리를 구성하고 있는 VRAM과 DRAM을 제어하고, 모니터를 동작시키기 위한 신호들을 발생시키며 HP(host processor)와의 정보교환을 담당한다. CPU의 기능 검증은 Daisy 워크스테이션에서 행해졌으며 입출력 부분은 실리콘 컴파일러의 일종인 GENESIL을 사용하여 설계되었다.

• 대한전기학회논문지:전력기술부문A
• /
• 제48권11호
• /
• pp.1476-1478
• /
• 1999

A musculotendon model is proposed to predict muscle force during muscle fatigue due to the continuous functional electrical stimulation(FES). Muscle fatigue dynamics can be modeled as the electrical admittance of muscle fibers and included in activation dynamics based on the{{{{ { Ca}^{2+ } }}}} kinetics. The admittance depends on the fatigue variable that monotonically increase or decrease if electrical pulse exists or not, and on the stimulation parameters and the number of applied pulses. In the response of the change in activation the normalized Hill-type contraction dynamics connected with activation dynamics decline the muscle shortening velocity and thus its force under muscle fatigue. The computer simulation shows that the proposed model can express the muscle fatigue and its recovery without changing any stimulation parameters.

• Journal of Electrical Engineering and Technology
• /
• 제13권6호
• /
• pp.2521-2529
• /
• 2018

This paper deals with a sampled-data tracking control problem for the Takagi-Sugeno fuzzy system with external disturbances. We derive a stability condition guaranteeing both asymptotic stability and H-infinity tracking performance by employing a newly proposed time-dependent line-integral fuzzy Lyapunov-Krasovskii functional. A new integral inequality is also introduced, by which the proposed stability condition is formulated in terms of linear matrix inequalities. Finally, the effectiveness of the proposed method is demonstrated through a simulation example.

• ETRI Journal
• /
• 제40권6호
• /
• pp.794-801
• /
• 2018

This paper proposes a novel graphene-based optical microelectromechanical systems MEMS accelerometer that is dependent on the intensity modulation and optical properties of graphene. The designed sensing system includes a multilayer graphene finger, a laser diode (LD) light source, a photodiode, and integrated optical waveguides. The proposed accelerometer provides several advantages, such as negligible cross-axis sensitivity, appropriate linearity behavior in the operation range, a relatively broad measurement range, and a significantly wider bandwidth when compared with other important contributions in the literature. Furthermore, the functional characteristics of the proposed device are designed analytically, and are then confirmed using numerical methods. Based on the simulation results, the functional characteristics are as follows: a mechanical sensitivity of 1,019 nm/g, an optical sensitivity of 145.7 %/g, a resonance frequency of 15,553 Hz, a bandwidth of 7 kHz, and a measurement range of ${\pm}10g$. Owing to the obtained functional characteristics, the proposed device is suitable for several applications in which high sensitivity and wide bandwidth are required simultaneously.

• 대한물리의학회지
• /
• 제13권4호
• /
• pp.95-103
• /
• 2018

PURPOSE: The present study was conducted to investigate the effects of functional electrical stimulation gait training with rhythmic auditory stimulation on balance and gait ability in stroke patients. METHODS: In this blinded randomized controlled study, 26 stroke patients were assigned to either experimental group (n=13) consisting of 30 min of gait training 5 days per week for 4 weeks while performing functional electrical stimulation gait training with rhythmic auditory simulation, or a control group (n=13) performing the same gait training program, also consisting of 30 minutes 5 days a week and lasting for 4 weeks, but without functional electrical stimulation and rhythmic auditory stimulation. At baseline and after the 4 week intervention, balance was measured using the timed up and go test (TUG). Gait velocity was measured using the 10-meter walk test (10 MWT) and gait ability was assessed using the functional gait assessment (FGA). RESULTS: After the intervention, the experimental group showed statistically significant differences in gait velocity and ability (10 MWT, FGA) (p<.05). Between-group differences were statistically significant in gait velocity and ability (10 MWT, FGA) (p<.05). CONCLUSION: The findings suggest that functional electrical stimulation gait training with a rhythmic auditory stimulation gait training program may help improve gait ability in stroke patients.