• 제목/요약/키워드: visual bio-feedback

검색결과 10건 처리시간 0.018초

시지각 바이오피드백 훈련이 뇌졸중 환자의 균형 및 자세조절에 미치는 영향 (The Effect of Visual Bio-feedback Training on Balance and Postural Control in Stroke Patients)

  • 임수정;이종수;김나라;김성식;이병희
    • 한방재활의학과학회지
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    • 제21권1호
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    • pp.137-148
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    • 2011
  • Objectives : This study was to investigate the visual bio-feedback training for 5 weeks on balance and postural control for patients with stroke. Methods : The 26 subjects were randomly selected from the patients of the E hospital in the S city who met the study conditions. They were divided into a visual bio-feedback training group of 13 patients and a self-resistance exercise group of 13 patients. The visual bio-feedback training group received visual bio-feedback and general physiotherapy for five weeks and the self-resistance exercise group received cycling and general physiotherapy for the same period. The subjects were measured and compared for stability index, weight distribution index, fall down index, functional reach test and timed up and go test before and after the program. Results : The visual bio-feedback training group showed significant changes after the experiment in stability index, weight distribution index, functional reach test and timed up and go test(p<0.05), and the self-resistance exercise group also showed significant differences(p<0.05). The changes between prior to and after the experiment show that the visual bio-feedback training group had more significant effects than the self-resistance exercise group(p<0.05). Conclusions : The visual bio-feedback training for five weeks had effects in the improvement of the balance and posture control of stroke patients. Based on these results, more effective training programs should be developed and propagated.

일부 여대생의 세 가지 균형조절 훈련 효과 비교 (The Effect of 3 Balance Training Programs on Improving Capabilities of Balancing among Some Female Students)

  • 유진호;정선미;박형수
    • 한국전자통신학회논문지
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    • 제8권4호
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    • pp.619-629
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    • 2013
  • 이 연구는 20대 여대생들을 대상으로 세 가지 균형조절 훈련(Aqua, Bio-feedback, Trampolin)이 정적 균형 능력과 시각, 전정각, 고유수용감각 등의 감각요소에 미치는 효과를 비교하기 위해 아쿠아 훈련군(10명), 바이오피드백 훈련군(10명), 트램폴린 훈련군(9명)으로 무작위 할당한 후 각 군별로 주 3회, 회당 30분간의 운동 프로그램을 6주간 진행하면서 3주후, 6주후에 Tetrax portable multiple system을 이용하여 안정성지수를 측정하고, 근전도 중앙주파수값을 이용하여 산출한 근전도 균형점수를 반복측정된 자료의 분산분석 및 Wilcoxon의 부호순위 검정 등을 이용하여 비교 분석한 결과를 종합해 볼 때, 바이오피드백 훈련은 세 가지 감각기능을 고루 향상시키며 아울러 감각기능 간의 협응성 또한 향상시키는 것으로 판단되며, 아쿠아 훈련은 전정기능을 집중적으로 강화시키는 것으로 보인다.

실시간 시각적 피드백 보행 훈련이 노인들의 보행 안정성에 미치는 영향 (Effects of Real-time Visual Feedback Gait Training on Gait Stability in Older Adults)

  • Byun, Kyungseok;Han, Sooji;Bhang, Dawon;Seo, Hyundam;Lee, Hyo Keun
    • 한국운동역학회지
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    • 제30권3호
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    • pp.247-253
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    • 2020
  • Objective: This study aimed to examine the effects of real-time visual feedback gait training on gait stability in older adults. Method: Twelve older adults participated in this study, being divided into 2 groups including a) visual feedback (VF) and b) non-visual feedback (NVF) groups. For 4 weeks, VF performed a treadmill walking training with real-time visual feedback about their postural information while NVF performed a normal treadmill walking training. For evaluations of gait stability, kinematic data of 15-minute treadmill walking were collected from depth-based motion capture system (30 Hz, exbody, Korea). Given that step lengths in both right and left sides were determined based on kinematic data, three variables including step difference, coefficient of variation, approximate entropy were calculated to evaluate gait symmetry, variability and complexity, respectively. Results: For research findings, VF exhibited significant improvements in gait stability after 4-week training in comparison to NVF, particularly in gait symmetry and complexity measures. However, greater improvement in gait variability was observed in NVF than VF. Conclusion: Given that visual feedback walking gives potential effectiveness on gait stability in older adults, gait training with visual feedback may be a robust therapeutic intervention in people with gait disturbances like instability or falls.

Effects of Visual Cue Deprivation Balance Training with Head Control on Balance Function and Fall Index in Older People

  • Kim, Seung-Kyu;Lee, Do-Youn;Nam, Seung-Min
    • The Journal of Korean Physical Therapy
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    • 제34권5호
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    • pp.212-217
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    • 2022
  • Purpose: This study sought to investigate the effects of visual cue deprivation balance training by applying head control feedback to the balance function and the fall index in older people. Methods: The study was conducted on 26 older people at the S Hospital in Gyeongsansi. The patients were randomly divided into the experimental groupI (EGI, n=9), the experimental groupII (EGII, n=9), and the control group (CG, n=8). The three groups were trained for 30 minutes three times a week for four weeks. To assess the patients' static balance function, their limits of stability (LOS) was measured using the BioRescue system, (RM Ingenierie, France), composed of a pressure platform that can measure force in diverse ways, a computer, and a monitor. The dynamic balance function was measured using the Berg Balance Scale (BBS). Also, the fall index was measured to evaluate the risk of falling. A paired t-test was performed to compare pre- and post-training performance within the groups. One-way ANOVA was performed for comparing the three groups. A post hoc least significant difference (LSD) test was also performed. Results: The results of the LOS showed a significant difference after training in the EGI and EGII groups (p<0.05). As a result of the difference between the three groups, there was a significant difference after training (p<0.05). The results of the BBS showed a significant difference after training in the EGI group (p<0.05). As a result of the difference between the three groups, there was a significant difference after training (p<0.05). Conclusion: Visual cue deprivation balance training applying head control feedback is effective in improving the dynamic balance function in older people. It is also necessary to constantly maintain the head orientation by feedback and to properly control the head movement.

Effects of Intra-abdominal Pressure with Visual Feedback on Muscle Activation of Upper Trapezius and Sternomastoid during Forced Inspiration in Individuals with Costal Respiration

  • Kim, Kwang-Su;Shin, Hwa-Kyung
    • The Journal of Korean Physical Therapy
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    • 제32권2호
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    • pp.75-79
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    • 2020
  • Purpose: This study analyzed the immediate effects of intra-abdominal pressure with visual feedback on the muscle activation of the upper trapezius and sternomastoid during natural inspiration and forced inspiration in individuals with costal respiration. Methods: The eighteen individuals with upper costal breathing pattern participated in this study. Surface electromyography was used to analyze the muscle activity of the upper trapezius and sternomastoid during natural inspiration and forced inspiration before and after intra-abdominal pressure. Results: A significant difference in muscle activation was observed with the muscle type, inspiration type, and test session (p<0.05). The muscle activities of the sternomastoid and upper trapezius decreased significantly during forced inspiration after intra-abdominal pressure training (p<0.05). On the other hand, there was no significant difference during natural inspiration in both muscles (p>0.05). A comparison of the difference between the pre-test and post-test during forced inspiration revealed the upper trapezius to be significantly larger than the sternomastoid (p<0.05). No significant difference was noted during natural inspiration (p>0.05). Conclusion: The intra-abdominal pressure has positive effects on correcting the breathing patterns in individuals with costal respiration.

Strawberry Harvesting Robot for Bench-type Cultivation

  • Han, Kil-Su;Kim, Si-Chan;Lee, Young-Bum;Kim, Sang-Chul;Im, Dong-Hyuk;Choi, Hong-Ki;Hwang, Heon
    • Journal of Biosystems Engineering
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    • 제37권1호
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    • pp.65-74
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    • 2012
  • Purpose: An autonomous robot was developed for harvesting strawberries cultivated in bench-type systems. Methods: The harvest robot consisted of four main components: an autonomous vehicle, a manipulator with four degrees of freedom (DOF), an end effector with two DOFs, and a color computer vision system. Strawberry detection was performed based on 3D image and distance information obtained from a stereo CCD color camera and a laser device, respectively. Results: In this work, a Cartesian type manipulator system was designed, including an intermediate revolute axis and a double driven arm-based joint axis, so that it could generate collision-free motions during harvesting. A DC servomotor-driven end-effector, consisting of a gripper and a cutter, was designed for gripping and cutting the strawberry stem without damaging the strawberry itself. Real-time position tracking algorithms were developed to detect, recognize, trace, and approach strawberries under natural light conditions. Conclusion: The developed robot system could harvest a strawberry within 7 seconds without damage.

Adaptive V1-MT model for motion perception

  • Li, Shuai;Fan, Xiaoguang;Xu, Yuelei;Huang, Jinke
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제13권1호
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    • pp.371-384
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    • 2019
  • Motion perception has been tremendously improved in neuroscience and computer vision. The baseline motion perception model is mediated by the dorsal visual pathway involving the cortex areas the primary visual cortex (V1) and the middle temporal (V5 or MT) visual area. However, few works have been done on the extension of neural models to improve the efficacy and robustness of motion perception of real sequences. To overcome shortcomings in situations, such as varying illumination and large displacement, an adaptive V1-MT motion perception (Ad-V1MTMP) algorithm enriched to deal with real sequences is proposed and analyzed. First, the total variation semi-norm model based on Gabor functions (TV-Gabor) for structure-texture decomposition is performed to manage the illumination and color changes. And then, we study the impact of image local context, which is processed in extra-striate visual areas II (V2), on spatial motion integration by MT neurons, and propose a V1-V2 method to extract the image contrast information at a given location. Furthermore, we take feedback inputs from V2 into account during the polling stage. To use the algorithm on natural scenes, finally, multi-scale approach has been used to handle the frequency range, and adaptive pyramidal decomposition and decomposed spatio-temporal filters have been used to diminish computational cost. Theoretical analysis and experimental results suggest the new Ad-V1MTMP algorithm which mimics human primary motion pathway has universal, effective and robust performance.

비지도 학습을 이용한 생체 모방 동작 인지 기반의 동작 순서 인식 (Bio-mimetic Recognition of Action Sequence using Unsupervised Learning)

  • 김진옥
    • 인터넷정보학회논문지
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    • 제15권4호
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    • pp.9-20
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    • 2014
  • 대상의 동작을 잘 예측하는 것은 사회적 상호작용과 의사결정 컨텍스트 이해의 핵심이다. 본 연구는 동작 인식 과정에서 인간 뇌 시각인지 과정을 모방한 방법으로 관절 동작의 동작 순서 패턴을 학습하는 컴퓨팅 모델을 제안하였다. 제안 방법의 핵심은 뇌에서 동작 인지 자극을 처리하는 신경생리학적 IT, MT, STS의 피질 기능과 특정 시각 신경 회로 네트워크 기능을 모방하여 비지도 방법으로 동작 순서를 학습한 후 동작을 예측, 인식하는 것이다. 실험을 통해 제안 모델이 어떻게 연속적으로 입력되는 비디오에서 의미있는 동작 스냅샷 뿐 아니라 중요한 동작 패턴을 자동으로 선택하는 지를 제시하였다. 이 핵심 움직임은 학습 네트워크가 정적 시점에서 정지 영상에 함축된 동작을 인식하는지를 증명하는데 이용하는 관절 자세이다. 또한 STS 피질 영역에서 어떻게 정지와 움직임 입력을 통합하는지를 모방하여 학습하고, 학습한 피드백 연결이 차후 동작의 입력 순서를 어떻게 예측하는지를 제시하였다. 네트워크 시뮬레이션을 통해 동작 인식에 대한 제안 모델의 우수성을 입증하였다.

동영상 실시간 시청시 유발전위(ERP) N400 속성을 이용한 주제무관 쇼트 선별 자동영상요약 연구 (A Video Summarization Study On Selecting-Out Topic-Irrelevant Shots Using N400 ERP Components in the Real-Time Video Watching)

  • 김용호;김현희
    • 한국멀티미디어학회논문지
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    • 제20권8호
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    • pp.1258-1270
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    • 2017
  • 'Semantic gap' has been a year-old problem in automatic video summarization, which refers to the gap between semantics implied in video summarization algorithms and what people actually infer from watching videos. Using the external EEG bio-feedback obtained from video watchers as a solution of this semantic gap problem has several another issues: First, how to define and measure noises against ERP waveforms as signals. Second, whether individual differences among subjects in terms of noise and SNR for conventional ERP studies using still images captured from videos are the same with those differently conceptualized and measured from videos. Third, whether individual differences of subjects by noise and SNR levels help to detect topic-irrelevant shots as signals which are not matched with subject's own semantic topical expectations (mis-match negativity at around 400m after stimulus on-sets). The result of repeated measures ANOVA test clearly shows a 2-way interaction effect between topic-relevance and noise level, implying that subjects of low noise level for video watching session are sensitive to topic-irrelevant visual shots, while showing another 3-way interaction among topic-relevance, noise and SNR levels, implying that subjects of high noise level are sensitive to topic-irrelevant visual shots only if they are of low SNR level.

네이버 뉴스 댓글을 이용한 산업 분야별 담론의 감성에 기반한 주제 트렌드 및 여론의 변화와 주가 흐름의 연관성 분석 (Analyzing Topic Trends and the Relationship between Changes in Public Opinion and Stock Price based on Sentiment of Discourse in Different Industry Fields using Comments of Naver News)

  • 오찬희;김규리;주영준
    • 정보관리학회지
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    • 제39권1호
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    • pp.257-280
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    • 2022
  • 본 연구에서는 대한민국 정부가 지정한 국가전략기술 사업인 반도체, 이차전지, 바이오 산업에 대한 여론을 파악하고 여론의 변화와 주가 흐름의 연관성을 분석하기 위해 각 산업별 대표 기업에 대한 기사의 댓글을 분석하였다. 반도체 산업에서 '삼성전자', 'SK하이닉스', 이차전지 산업에서 '삼성SDI', 'LG화학', 바이오 산업에서 '삼성바이오로직스', '셀트리온'을 선정하여 이를 제목에 포함하고 있는 2020년 1월 1일부터 2020년 12월 31일까지 발행된 네이버 뉴스 기사의 댓글 47,452개를 수집하고 분석하였다. 먼저, 해당 댓글을 긍정, 중립, 부정의 감성으로 나누고 각 감성 그룹에서의 시간의 흐름에 따른 댓글의 동적인 주제를 분석하여 각 산업별 여론의 트렌드를 파악하였다. 분석 결과 반도체 산업 분야의 경우 투자, 코로나19관련 이슈, 삼성전자라는 대기업에 대한 신뢰, 정부 정책 변화로 인한 타격에 대한 언급이 주제 토픽으로 나타났다. 이차전지 산업체의 경우 투자, 배터리, 기업 이슈에 대한 언급이 주제 토픽으로 나타났다. 바이오 산업체의 경우 투자, 코로나19 관련 이슈 및 기업 이슈에 대한 언급이 주제 토픽으로 나타났다. 다음으로, 댓글의 감성이 실제 주가와 연관성이 있는지를 알아보고자 각 대표 기업 별 주가의 변화와 댓글의 감성 점수 변화를 시각적 분석기법을 이용하여 비교 분석하였다. 분석 결과, 댓글의 감성 점수와 주가의 변화 흐름이 매우 유사하게 나타남을 통해 여론의 감성 점수 변화와 주가의 흐름에는 연관성이 있음을 확인하였다. 본 연구는 주가와의 연관성이 높은 뉴스 기사 댓글을 분석했다는 점, 수집 시기를 코로나19로 선정하여 코로나19라는 특수한 상황에서의 여론 트렌드 변화를 파악했다는 점, 국가전략기술제도에 속하는 산업 기업에 대한 여론을 분석하여 정부기관의 관련 정책 제정에 객관적인 근거를 제공하였다는 점에서 의의를 지닌다.