• Proceedings of the KIEE Conference
• /
• 1995.07b
• /
• pp.689-691
• /
• 1995

In this paper, a fault detection and isolation unit(FDIU) for a centrifugal pump system driven by DC-motor is proposed. The proposed scheme can be classified into the dedicated observer scheme(DOS). A fuzzy logic based inference engine is adopted for the isolation of each faults. Having the fuzzy inference engine, the proposed FDIU resolve a few important problems of the conventional DOSs with conventional two valued logic. The ouputs of the proposed FDIU are not "ith fault occurred" but the grade of memberships that indicate the consistency of observered symptoms(residuals) with each fault symptoms stored in the rule base. The ouputs can easily be transferred to the ranking of the fault possibilities and it will provide very useful informations in monitoring the process. The simulation results show that the FDIU has very good diagnostic ability even in the noisy environment.

• Journal of Aerospace System Engineering
• /
• v.7 no.4
• /
• pp.42-48
• /
• 2013

In this paper, a study of solid rocket propellant formulation is performed to suppress plume and reduce IR(infrared) signature which occurs in propellant combustion. The solid propellant to enhance the stealthy ability was formulated in terms of the kinds and the effects of afterburning suppressant on the ballistic performance and the amount of primary smoke. In addition, substantial decrease in plume and IR signature is confirmed by static firing test by a 4 inch standard motor.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2003.11a
• /
• pp.69-76
• /
• 2003

In this paper, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. Fuzzy controller is shown more excellent efficency than a conventional controllers in the strength aspect and non-linear controller using IF-THEN rule which can control without process the accurate mathematical modeling about induction motor. But we cannot expect that conventional fuzzy controller divide equally the space of input and output parameter and use the certain shape of triangle membership function. Therefore to develop the efficiency of conventional fuzzy controller, We need to scale the range of membership functions. In this study, proposed fuzzy controller has the ability controlling scale of membership functions using by output scaling factor.

• International Journal of Advanced Culture Technology
• /
• v.6 no.4
• /
• pp.80-86
• /
• 2018

The intervention of Autism Spectrum Disorder (ASD) is limited research focus on the effect of occupational-based intervention. This study sought to determine the effect of occupational-based intervention of chopstick skills for children with ASD. This study included a total of 3 children with ASD.Using single-subject study design, a changing criterion design and ABC design were implemented. The participants' behavior was observed and recorded throughout each session. In this study, the results were analyzed through visual graphs. The amount of food that was moved using the chopsticks was gradually increased. The results show that all participants significantly improved in their ability to use chopsticks in each intervention session. In addition, Assessment of Motor and Process Skills (AMPS) improved the generalization. According to the AMPS, both the overall motor and process skills increased from baseline an average of 0.7 logit. The results of this study showed occupational-based intervention on chopsticks skill to be effective in acquisition and generalization of chopstick skill in children with ASD.

• Proceedings of the KIEE Conference
• /
• 2005.10c
• /
• pp.202-204
• /
• 2005

This paper is proposed genetic algorithm tuning(GAT) controller for high performance of induction motor drive. We employed GA to the classical PI controller. The approach having ability for global optimization and with good robustness, is expected to overcome some weakness of conventional approaches and to be more acceptable for industrial practices. The control performance of the GAT PI controller is evaluated by analysis for various operating conditions. The results of experiment prove that the proposed control system has strong high performance and robustness to parameter variation, and steady-state accuracy and transient response.

• PNF and Movement
• /
• v.7 no.1
• /
• pp.9-16
• /
• 2009

Purpose : The aim of this study was to determine the effect of proprioceptive neuromuscular facilitation(PNF) on balance ability in poststroke hemiparetic subjects. Methods : The subjects of this study were 12 patients with hemiplegia who volunteered to participate in the experiment which was carried out over the course of 4 weeks. The Proprioceptive Neuromuscular Facilitation is applied to group with three positions (sidelying, half-standing, modified plantigrade). The tests between before and after the intervention were measured by FSST (Four Square Step Test), FICSIT-4 (Frailty and Injuries: Cooperative Studies of Intervention Techniques), BBS(Berg Balance Scale). The data were analyzed using paired t-test and Wilcoxon signed rank test to determine the statistical significance. Results : The results of this study were summarized as follows: 1. After intervention, the score of BBS and FICSIT-4 significantly were increased compared with before intervention. 2. After intervention, the time of FSST were reduced significantly compared with before intervention. Conclusions : According to above results, Proprioceptive Neuromuscular Facilitation improved with balance ability of patients with hemiplegia. This study provided basic data for effects Proprioceptive Neuromuscular Facilitation on balance ability. In conclusion, Proprioceptive Neuromuscular Facilitation with other interventions is effective way to improve balance ability of patients with hemiplegia.

• Journal of Welding and Joining
• /
• v.15 no.1
• /
• pp.81-91
• /
• 1997

In this study, a magnetic sensor to make use of eddy current was developed to detect the weld seam of butt joint in the sheet metal arc welding. This system consist of the sensor device for detecting the weld line, the servo control device for driving the weld torch movement and the control unit. A signal processing was applied to smooth the output signal of the sensor. The weld joint was determined by using a 1st order differential method. To improve tracking accuracy of the system, moving average method which has an effect of proportional and weighted integral control was applied to a series of the weld joint positions obtained above. The weld line for tracking was generated by using data regeneration algorithm. Based on these results, each servo motor was controlled by pulse generator. From experimental results, it was revealed that this system has excellent detecting ability for weld line and seam tracking ability.

• Journal of Ocean Engineering and Technology
• /
• v.34 no.1
• /
• pp.13-18
• /
• 2020

An azimuth propeller can generate thrust in all directions by rotating its housing with an electric motor. An azimuth propeller can be operated using several methods to stop a ship. This study aims to derive an efficient method to stop a ship safely using an azimuth propeller through full-scale maneuvering trials with the research vessel "NARA" of Pukyong National University in 4.63 m/s (9 kts). Five methods with different azimuth propeller operations were tested to stop the ship. The test results confirmed that the simultaneous use of the thrust and the hydrodynamic force acting on the strut is the most effective method to stop the ship.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.10a
• /
• pp.1062-1065
• /
• 2002

We have evaluated the ability of a time-delayed artificial neural network (TDANN) to predict muscle forces using only eletromyographic(EMG) signals. To achieve this goal, tendon forces and EMG signals were measured simultaneously in the gastrocnemius muscle of a dog while walking on a motor-driven treadmill. Direct measurements of tendon forces were performed using an implantable force transducer and EMG signals were recorded using surface electrodes. Under dynamic conditions, the relationship between muscle force and EMG signal is nonlinear and time-dependent. Thus, we adopted EMG amplitude estimation with adaptive smoothing window length. This approach improved the prediction ability of muscle force in the TDANN training. The experimental results indicated that dynamic tendon forces from EMG signals could be predicted using the TDANN, in vivo.

• Journal of Korean Physical Therapy Science
• /
• v.17 no.3_4
• /
• pp.11-21
• /
• 2010

Purpose: To Provide 3 main principles that needs to be changed for clinical practice and suggest the frame of clinical practice in accordance with the change of generation. Methods: We reviewed literatures related with Clinical Practice. Results: The purpose of physical therapy is to maintain the client's motor and functional ability and enhance the quality of lifestyle. To carry out the principles of clinical practice effectively all the physical therapist must be able to comprehend as follows. First, physical therapy can be different generation by generation. Second, technical terminology must be used when communicate. Third, There are certain ways of process in physical therapy. Conclusion: Physical therapist that is heath care professional occupation in health related, is in need of constant endeavor. Also physical therapist must train oneself self-directed learning.