• 한국전문물리치료학회지
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• 제25권2호
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• pp.53-61
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• 2018

Background: Stroke patients show abnormal walking patterns due to brain injury. In order to have the desired walking pattern, appropriate stimulation is required to activate the central pattern generator. For this reason, our study performed treadmill ambulatory training with rhythmic auditory stimulation. However we did not consider the influence of visual feedback. Objects: The purpose of this study was to compare the gait abilities in chronic stroke patients following either treadmill walking training with rhythmic auditory stimulation and visual feedback (TRASVF) or treadmill walking training with rhythmic auditory stimulation (TRAS) alone. Methods: Twenty-one stroke patients were divided into two groups: A TRASVF group (10 subjects) and a TRAS group (11 subjects). They received 30 minutes of neuro-developmental therapy (NDT) and walking training for 30 minutes, five times a week for three weeks. Temporal and spatial gait parameters were measured before and after the training period. The Biodex gait trainer treadmill system measured gait parameters. Results: After the training periods, the TRASVF group showed a significant improvement in walking speed, the step length of the affected limb, and time on each foot of the affected limb when compared to the TRAS group (p<.05). Conclusion: The results of this study showed that the treadmill walking training with rhythmic auditory stimulation and visual feedback improved individual gait ability more than the treadmill walking training with rhythmic auditory stimulation alone. Therefore, visual feedback should be considered along with rhythmic auditory stimulation training.

• 디지털융복합연구
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• 제19권8호
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• pp.75-88
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• 2021

4차산업혁명 시대의 도래와 더불어 융합형 인재양성의 중요성이 부각 되고 있고 이러한 교육을 담당할 예비교사들의 융합수업(STEAM) 구성 능력의 함양이 양질의 미래 교육을 담보할 이슈로 떠오르고 있다. 이에 본 연구는 진정한 융합교육이 이루어지기 위해서는 교수자의 면밀한 피드백의 역할과 기능이 예비교사들의 역량 강화에 주요한 요소임을 제시하며, 교육학에 있어서 피드백에 관한 제반 이론이 이러닝을 활용한 대학 수업에서 예비교사들의 융합적 지식형성을 어떻게 지원하는지를 분석하였다. 예비교사들은 STEAM 수업지도안을 작성하는 과정에서 4단계의 조별 활동과 그에 걸맞은 피드백을 제공 받았으며 5단계에서는 이를 바탕으로 개별 수업지도안을 완성하였다. 수업지도안의 완성 후에는 설문조사를 실시하여 예비교사들의 인식을 조사하였다. 단계별로 적용된 통합적 피드백의 세부적 내용과 융합적 수업구성 역량의 향상 과정을 사다리이론을 근거로 하여 모델링 하였다. 이러한 전략적 모형은 예비교사들의 융합적 지식과 역량을 제고할 뿐 아니라 그들의 성취도와 만족도 향상에도 기여하였다.

• 디지털융복합연구
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• 제14권6호
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• pp.285-294
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• 2016

본 연구는 간호대학생을 대상으로 기관내 흡인실습교육을 중심으로 스마트폰 동영상과 형성적 피드백을 활용한 핵심기본간호술 교육이 대상자의 핵심기본간호술 지식, 핵심기본간호술 수행능력, 자기효능감, 학습동기에 미치는 효과를 파악하기 위해 시도되었다. 간호대학 2학년 학생 54명이 모집되었으며, 실험군과 대조군으로 각각 27명씩 구성되었다. 실험군에게는 핵심기본간호술 지도 시 개별적인 형성적 피드백을 제공하였고, 수행과정을 스마트폰 동영상으로 촬영한 교육을 실시하였다. 대조군에게는 일반적 실습교육인 4시간 자율실습을 실시하였다. 연구결과 실험군의 핵심기본간호술 지식, 핵심기본간호술 수행능력, 자기효능감, 학습동기가 대조군에 비해 유의하게 향상되었다. 본 연구결과를 바탕으로 향후 간호대학에서 핵심기본간호술 교육 시 스마트폰 동영상을 활용한 반복학습과 형성적 피드백을 통한 정교한 학습이 이뤄질 수 있도록 교육현장에서 활발하게 활용되기를 고대한다.

• 대한의용생체공학회:의공학회지
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• 제27권5호
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• pp.282-290
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• 2006

We have developed a multi band digital hearing aid algorithm emphasizing feedback cancellation and a hardware module to evaluate the performance of our algorithm. The hearing aids should be able to compensate for individual hearing loss characteristics of hearing impaired person. Thus hearing aids need the function of multi-bands amplification and the capabilities of feedback cancellation that can remove howling caused by acoustic feedback. In this paper, we proposed a digital hearing aid algorithm which has multi-bands compensation using modified discrete cosine transform (MDCT) and can efficiently remove acoustic feedbacks. Moreover, we have developed digital hearing aid hardware module, which can evaluate hearing aid algorithms in real time operation. The developed algorithm and hardware module were verified through computer simulation and clinical tests. Through operational experiments, good performances in real time operation environment and an efficient howling cancellation were also observed. The developed hardware module can operate in stable condition and it is expected to become a good hardware platform for developing hearing aid algorithms.

• 한국정밀공학회지
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• 제21권8호
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• pp.171-179
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• 2004

The purpose of this study is to generate cycling motion for FES (functional electrical stimulation) using knee muscles only. We investigated the possibility by simulation. The musculoskeletal model used in this simulation was simplified as 5-rigid links and 2 muscles (knee extensor and flexor). For the improvement of the present feedforward control in FES, we included feedback path in the control system. The control system was developed based on the biological neuronal system and was represented by three sub-systems. The first is a higher neuronal system that generates the motion command for each joint. The second is the lower neuronal system that divides the motion command to each muscle. And the third is a sensory feedback system corresponding to the somatic sensory system. Control system parameters were adjusted by a genetic algorithm (GA) based on the natural selection theory. GA searched the better parameters in terms of the cost function where the energy consumption, muscle force smoothness, and the cycling speed of each parameter set (individual) are evaluated. As a result, cycling was implemented using knee muscles only. The proposed control system based on the nervous system model worked well even with disturbances.

• 제어로봇시스템학회논문지
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• 제15권10호
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• pp.1039-1046
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• 2009

In this work, a bilateral control for a master-slave manipulator system which will be used for handling objects contaminated by radioactivity has been addressed. The links of manipulators are driven independently by individual motors installed on the base and the driving torque is transmitted through pre-tensioned tendons. The measurable variables are the positions and rates of master/slave motors. In the consideration of the flexibility of the tendon and available measurements for control, we proposed an optimal static output feedback control for possible bilateral control architecture. By using modal analysis, the system model is reduced to guarantee the detectability which is a necessity for the static output feedback control design. Based on the reduced model, the control gains are determined to attenuate vibration in the sense of optimality. The feasibility of the proposed control design was verified along with some simulation results.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.683-688
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• 2008

The emotional information processing is to simulate and recognize human sensibility, sensuality or emotion, to realize natural and harmonious human-machine interface. This paper proposes an emotion-based image retrieval method. In this method, user can choose a linguistic query among some emotional adjectives. Then the system shows some corresponding representative images that are pre-evaluated by experts. Again the user can select a representative one among the representative images to initiate traditional content-based image retrieval (CBIR). By this proposed method any CBIR can be easily expanded as emotion-based image retrieval. In CBIR of our system, we use several color and texture visual descriptors recommended by MPEG-7. We also propose a fuzzy similarity measure based on Choquet integral in the CBIR system. For the communication between system and user, a relevance feedback mechanism is used to represent human subjectivity in image retrieval. This can improve the performance of image retrieval, and also satisfy the user's individual preference.

• Ocean and Polar Research
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• 제25권spc3호
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• pp.409-416
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• 2003

Coastal development works generally increase the suspended sediment concentration of the ambient water, causing environmental impacts in various manners. The most active measures in three sides have been reviewed for their applicabilities in Korea. Referring to the cases in the USA, the legislation of environmental windows seems to be not proper for Environmentally Sound and Sustainable Developments (ESSD) until sufficient scientific data are obtained to address the individual issues of potential negative impacts. Feedback monitoring can be regarded as the best way for ESSD. Korea also has the basic legal system for the feedback monitoring as well as Environmental Impact Assessments (EIA). However, the frequency, period and parameter of related surveys should be improved for the true ESSD. Moreover, environmental facilities such as environmental dredgers should be widely used for mitigating environmental Impacts caused by coastal development works.

• 한국안전학회지
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• 제39권2호
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• pp.54-64
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• 2024

This study investigated the impact of a safety coaching program on the safety behavior and safety climate among expressway safety patrols. Four to seven patrols from each of the three branches participated in this study. The safety coaching program was developed based on the GROW model, with main contents including recognizing individual differences, exploring safety values, communicating near-misses, providing effective and efficient feedback, employing non-violent communication, and fostering commitment toward safety behaviors. Additionally, each session included self-monitoring and peer review of each item based on a critical behavior checklist developed for this study, with challenging goals set based on the monitoring and review. The safety coaching program comprised six sessions in three branches, while three other branches were assigned as a control group. A non-equivalent control group experimental design was applied. Dependent variables included observed and perceived safety behavior, safety climate, psychological safety, and feedback. The results indicated that the safety coaching program effectively increased patrols' safety behavior and safety climate. Furthermore, psychological safety and feedback improved. These findings suggest that the developed safety coaching program could serve as an alternative method to enhance safety management for expressway safety patrols. Finally, the implications, limitations, and directions for future research are discussed.

• 한국컴퓨터산업학회논문지
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• 제2권12호
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• pp.1591-1600
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• 2001

웹 기반 코스웨어들이 많이 개발되고 있다. 그러나, 기존에 개발된 대부분 웹 기반 코스웨어들은 학습자들에게 항상 같은 교수 방법을 제공하므로 학습자들의 다양한 요구를 수용하는데 부족한 면이 있다. 학습자들이 개별적으로 가장 적합한 교수 방법으로 학습한다면 학습 효율을 높일 수 있을 것이다. 본 연구에서는 학습자의 개인차를 고려하면서 다양한 학습 방법을 제공하고, 교수 시스템은 교수 방법 중에서도 학습자에게 효율성이 높다고 생각되는 교수 방법을 학습자에게 추천하도록 하고, 학습자는 선호하는 방법을 선택하여 학습하도록 하였다. 평가모듈은 개개인의 응답에 대하여 개별적인 피드백을 주었다. 그리고 이 프로토타입 시스템을 대학1학년을 대상으로 적용하여 본 시스템의 교육적 효과를 입증하였다.