• 한국콘텐츠학회논문지
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• 제18권12호
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• pp.468-488
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• 2018

메이커 운동은 필요한 물건을 직접 만드는 사람들이 모여, 창의적 만들기를 통해 지식과 경험을 공유하는 사회와 문화의 움직임이다. 그러나 지난 10년간 메이커 운동이 빠르게 성장하면서, 어디까지를 메이커 운동으로 볼 것인지에 대한 공감대가 아직 부족하다. 앞으로의 발전 방향성을 모색하기 위해서는, 지금까지 메이커 운동이 어떻게 변화해 왔는지를 조망하는 것이 필요하다. 본 연구는 메이커 운동에 대한 이슈가 일반 미디어에서 어떻게 변화됐는지를 파악하기 위하여 언론 기사들을 텍스트 기반의 빅데이터 분석 방법론을 활용하여 분석한다. 특히 시간에 따른 관심의 변화를 다각도로 분석하기 위하여 키워드 네트워크 분석과 동적 토픽 모델을 통합적으로 적용한다. 키워드 네트워크는 메이커 운동의 발전을 분석하기 위하여 단어 수준에서 시기별 주요 키워드를 도출하고, 동적 토픽 모델은 메이커 운동이 아우르는 다양한 분야 관점에서 관심도의 변화를 단어와 토픽, 문서의 세 가지 수준에서 파악할 수 있도록 도와준다. 결과적으로 주요 토픽은 창업, 메이커스페이스, 메이커 교육 등이 식별되었고, 주요 키워드는 3D프린터와 기업에서 교육으로 변화된 것을 확인할 수 있다.

• Physical Therapy Rehabilitation Science
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• 제5권3호
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• pp.143-148
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• 2016

Objective: This study aimed to quantify one of the useful upper extremity movements to evaluate motor control abilities between the groups of people with mild and moderate arm impairments performing a door handling task. Design: Cross-sectional study. Methods: Twenty-one healthy participants and twenty-one persons with chronic stroke (9 mild stroke and 12 moderate stroke) were recruited for this study. Stroke participants were divided into 2 groups based on Fugle-Meyer Assessment scores of 58-65 (mild arm) and 38-57 (moderate arm). All they performed door handling task including the pronation and supination phases 3 times. We measured some movement factors which were reaction time, movement time, hand of peak velocity, hand of movement units to perform door handling task using the three-dimensional motion analysis. Results: The majority of kinematic variables showed significant differences among study groups (p<0.05). The reaction time, total and phase of movement time, hand of peak velocity, the number of movement units discriminated between healthy participants and persons with moderate upper limb stroke (p<0.05). In addition, reaction time, total and phase of movement time, the number of movement units discriminated between those with moderate and mild upper limbs of stroke patients (p<0.05). Conclusions: Three-dimensional kinematic motion analysis in this study was a useful tool for assessing the upper extremity function in different subgroups of people with stroke during the door handling task. These kinematic variables may help clinicians understand the arm movements in door handling task and consist of discriminative therapeutic interventions for stroke patients on upper extremity rehabilitation.

• 대한통합의학회지
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• 제11권2호
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• pp.207-219
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• 2023

Purpose : This study was conducted to investigate the changes in trunk movement and ground reaction during sit to stand motion using visual feedback. Methods : Fifteen adults (average age: 23.53±1.77 years) participated in this study. An infrared reflective marker was attached to the body each participant for motion analysis, and the participants performed sit to stand motion while wearing a hat attached with a laser pointer, which provided visual feedback. First, the sit to stand action was repeated thrice without obtaining any visual feedback, followed by a three minute break. Next, the laser pointers attached to hats were irradiated on a whiteboard, located at a distance of 5 m in front of the chairs, on which the participants sat; a baseline was set, and the participants performed stand up movements three times under this condition. A visual feedback was provided to the participants to prevent the laser pointers from crossing the set baseline. During each stand-up movement, the position of the reflective marker attached to the subject's body was recorded in real time using an infrared camera for motion analysis. The trunk movement and ground reaction force were extracted through recorded data and analyzed according to the presence or absence of visual feedback. Results : The results indicated that in the presence of a visual feedback during the sit-to-stand movements, the range of motion of the trunk and hip joints decreased, whereas that of the knee and ankle joints increased in the sagittal plane. The rotation angle of the trunk in the horizontal plane decreased. The left and right movement speed of the center of pressure increased, the pressing force decreased, and the forward and backward movement speed of the trunk decreased. Conclusion : The results suggest that the efficiency and stability of the stand up movement of a body increase when a visual feedback is provided.

• 한국실내디자인학회논문집
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• 제15권5호
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• pp.28-35
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• 2006

During the modern age, various fields have fundamentally changed from the preconceived ideas of the past. The concept of time-space relationship changed also. E. J. Marey was almost the first one to visualize the movement of animals and people through scientific methods. Frank B. Gilbreth used more precise photographic equipments to develop more accurate and specific body movement diagrams. The emergence of visualization of body movement is not the only product from the scientific field. The new concept of time-space can be easily noticed in modem art, music and dance. In space design, Futurism attempted to represent the dynamism and speed in a sculptural form. On the other hand, there were examples to further investigate the specific analysis of body movements such as 'Scientific Management'. Body movement diagrams are widely used in various projects in contemporary space design. The difference is that now the design process is more integrated with the analysis. The representation of speed and the container of movements are interwoven in a complex manner in which fluid relationship between body and space is possible. Three types can now be considered: Object, Container and Interactivity. This study attempts to analyze brief history of body movement studies and their application for contemporary space design.

• 전기학회논문지
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• 제65권10호
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• pp.1746-1754
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• 2016

In this paper, we provide a development and evaluation method for an archery posture analyzing system, using an inertial sensor. The system was developed using LabVIEW2014 by National Instruments and evaluated using the DTW algorithm. To convert the voltage value of the inertial sensor into a physical value, a coordinate transformation matrix bias was applied. To evaluate the similarity of movement in archery shooting, the DTW distance was calculated and similarity was confirmed based on simple mechanical movement, the same person's shooting movement, shooting movement with another person, and the noise signal. The average similarity comparison results were as follows: simple mechanical movement was 17.05%, the same person's shooting movement was 26.48%, shooting movement with another person was 62.8%, and the noise signal was 328.5%; a smaller value indicates a higher level of similarity. We confirmed the possibility of analyzing the archery posture using 3-axis acceleration of the inertial sensor. We inferred that the proposed method might be important means for assessing shooting skills, evaluation of archer's progress, and finding talented archers in advance.

• 한국운동역학회지
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• 제28권2호
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• pp.109-117
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• 2018

Objective: To compare head and hand movement patterns during squash forehand motions between experts and less-skilled squash players. Method: Four experts and four less-skilled squash players participated in this study. They performed squash forehand swings and a VICON motion analysis system was used to obtain displacement and velocity data of the head and right hand during the movement. Mann-Whitney U-tests were performed to compare head and hand range of motion and peak velocity, and cross-correlation was performed to analyze the head-hand coordination pattern between groups in three movement directions. Results: In terms of head and hand kinematic data, experts had greater head range of motion during down swings than less-skilled squash players. Experts seemed to reach peak hand velocity at impact by reaching peak head velocity followed by hand peak velocity within a given temporal sequence. In terms of head-hand coordination patterns, both groups revealed high positive correlations in the medial-lateral direction, indicating a dominant allocentric coordination pattern. However, experts had uncoupled coordination patterns in the vertical direction and less-skilled squash players had high positive correlations. These results indicate that the head-hand movement pattern likely an important factor squash forehand movement. Conclusion: Analysis of head and hand movement patterns could be a key variable in squash training to reach expert-level performance.

• 한국콘텐츠학회논문지
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• 제13권12호
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• pp.672-679
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• 2013

창의성은 문제인식과 해결방법으로 상상력을 통한 새로운 이미지의 사고능력과 표현이다. 이 연구는 신체움직임의 창의성이론을 탐구하고 창의성 요인을 분석하였다. 연구결과, 신체움직임의 창의성은 첫째, 움직임 자각 둘째, 신체움직임 디자인 셋째, 움직임의 발견, 넷째, 움직임활용이라는 단계가 필요하다. 자기지각과 자아개념을 통한 새로운 이미지의 활용은 문제인식과 해결기능에 대한 창의적인 향상을 가져온다. 결론적으로 신체움직임의 창의성은 상호작용에 의한 '제3의 힘'과 '흐름의 유연성'으로 신체움직임의 무한성을 의미한다.

• 대한인간공학회지
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• 제27권2호
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• pp.9-14
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• 2008

Coherence can be used to evaluate the functional cortical connections between the motor cortex and muscle. This study is to find coherence between EEG (electroencephalogram) and EMG (electromyogram) evoked by movement of a hand. Seven healthy participants were asked to perform thirty repetitive movement of right hand for ten seconds with rest for ten seconds. Specific feature of EEG components has been extracted by ICA (independent component analysis) and coherence between EEG and EMG was analyzed from data measured EEG in five local areas around central part of head and EMG in flexer carpri radialis muscle during grabbing movement. Coherence between EEG and EMG was successfully obtained at 0.025 confidence limit during hand movement and showed significant difference between rest and movement at 13-18Hz.

• 산업기술연구
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• 제26권B호
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• pp.191-198
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• 2006

In this paper, we focus on a question. Which is better between time-based location update method and movement-based location update method? Or, does any other method combining the two methods show better performance? For the question, we propose a hybrid location update scheme, which integrates the time-based and the movement-based methods. In the proposed scheme, a mobile terminal updates its location after n cell boundary crossing and a time interval of T, or the inverse. We derive an analytical solution for the performance of the hybrid scheme with exponential cell resident time. From the numerical analysis, we conclude that the movement-based method seems to have better performance than the time-based and hybrid methods, that is the optimal costs occur at T=0.

• 한국산학기술학회논문지
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• 제11권5호
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• pp.1799-1804
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• 2010

연약지반 위에 설치된 교대나 옹벽과 같이 성토재하중을 받는 구조물은 연약지반의 과도한 변형 때문에 지반이 수평방향으로 이동하는 측방유동 현상이 발생할 수 있고 이로 인해 많은 피해가 발생할 수 있다. 이 연구에서는 원심모형시험을 이용하여 현장에서 교대 배면부 성토시 발생할 수 있는 교대 측방유동여부를 판단하였고, 교대측방유동에 대한 대책공법으로 압성토 공법을 적용하여 공법적용 후 지반과 교대 구조물에 대한 안정성 여부를 FEM(Finite Element Method)프로그램인 MIDAS/GTS를 이용하여 검토하였다. 원심모형시험 결과 현장에서 예측되는 교대의 수평변위는 허용치(15mm)를 초과하여 발생하였으며, 대책공법으로 압성토 공법 적용할 때 교대는 측방유동에 대해 안정하다는 사실을 수치해석을 통해 알 수 있었다.