• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.139-142
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• 2006

Numerous simulation studies and researches have recently revealed the rapid development and evolution in the emerging area of intelligent unmanned aerial vehicle (UAV). This study aims to develop a flight performance evaluation about the wireless unmanned helicopter. The process includes the design and testing of flight hardware and software that interprets sensor data. For the unmanned helicopter used in this research, an inertial sensor that provides posture (roll, pitch and yaw angles) and a Bluetooth is used to provide wireless connection between the user's pc and the helicopter were installed in the helicopter the helicopter's pitch, roll and yaw were the communication data. The accuracy of the system was confirmed by a computer simulation. The software also has been developed to support operators and displays helicopter position and posture by graphics.

• 한국응용과학기술학회지
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• 제38권3호
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• pp.851-859
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• 2021

이 연구의 목적은 6주간의 플라이오메트릭 트레이닝이 태권 시범선수의 서전트 점프, 자세 조절 및 하체 부상 준거에 미치는 영향을 보고자 하였다. 이 연구에 참여한 대상자는 대학 태권 시범선수 20명을 대상으로 운동군 10명과 통제군 10명을 무작위로 분류하였다. 운동군은 주 3회, 60분, 6주간 실시하였고, 통제군은 일반적인 훈련을 하였으며, 사전 사후 서전트 점프, 배근력, 자세 조절 및 하체 부상 준거를 측정하였다. 연구 결과, 배근력에서는 유의하지 않았으나 서전트 점프에서는 유의한 증가가 있었다. 자세조절에서는 앞쪽은 경우 유의하지 않았으나 좌·우 후방 외쪽과 안쪽에서는 유의한 증가가 있었고, 종합점수 결과 하체 부상의 위험성은 없는 것으로 나타났다. 결론적으로 플라이오메트릭 트레이닝은 순발력, 자세 조절, 하체 부상 방지 및 재활에 적극적으로 활용할 필요가 있는 훈련 방법이다.

• 패션비즈니스
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• 제27권4호
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• pp.125-140
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• 2023

This study aimed to develop a smart wearable device for assessing the risk angle associated with turtle neck syndrome in patients with Video Display Terminal (VDT) syndrome. Turtle neck syndrome, characterized by forward head posture resulting from upper cross syndrome, leads to thoracic kyphosis. In this research, a stretch sensor was used to monitor the progression of turtle neck syndrome, and the sensor data was analyzed using a Universal Testing Machine (UTM) and the Gauge Factor (GF) calculation method. The scapula and cervical spine angles were measured at five stages, with 15-degree increments from 0° to 60°. During the experimental process, the stretch sensor was attached to the thoracic spine in three different lengths: 30mm, 50mm, and 100mm. Among these, the attachment method yielding the most reliable data was determined by measuring with three techniques (General Trim Adhesive, PU film, and Heat Transfer Machine), and clothing using the heat transfer machine was selected. The experimental results confirmed that the most significant change in thoracic kyphosis occurred at approximately 30° of forward head posture. Prolonged deformity can lead to various issues, highlighting the need for textile sensor solutions. The developed wearable device aims to provide users with real-time feedback on their turtle neck posture and incorporate features that can help prevent or improve the condition.

• 한국전문물리치료학회지
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• 제12권4호
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• pp.41-47
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• 2005

The purpose of this study was to determine the intra-rater and inter-rater reliability of various forward head posture measurements. Ten healthy adults (age, $20.4{\pm}2.2$ yrs; height, $164.0{\pm}5.5$ cm; weight, $58.7{\pm}7.3$ kg) participated in the study. They were free of injury and neurologic deficits in the upper extremities and neck at the time of testing. The subjects were asked to perform head forward posture by under the guidance of physical therapists. Markers were placed on the C7 spinous process, mastoid process, tragus of the ear, outer canthus, and forehead. Measurement 1 for forward head posture assessment was measured as the angle between the horizontal line through C7 and the line connecting the C7 spinous process with the tragus of the ear. Measurement 2 was measured as the angle between the C7 spinous process, the mastoid process and the outer canthus. Measurement 3 was measured as two kinds of angles the HT (head tilt) angle is between the line from the midpoint of forehead to the tragus line and Y-axis at the tragus point. The NF (neck flexion) angle is between the line from the tragus to the C7 line and the Y-axis at the C7. Intra-rater, inter-rater reliability and coefficient of variation was assessed by comparing the measured values from three kinds of measurements of forward head posture. The intra-rater reliability was indicated by intraclass correlation coefficients [ICC(1,1)] and inter-rater reliability was shown by intraclass correlation coefficients [ICC(3,k)]. The results of study were as follows: ICC(1,1) values for intra-rater reliability of three measurements were in the 'excellent' category. ICC(3,k) values for inter-rater reliability of three measurements were also in the 'excellent' category. The coefficient of variation of method 2 had a lower value than method 1 and method 3. This data means that the measured value of method 2 was less scattered. Further research is needed to determine whether the validity of all measurements is revealed in the 'excellent' category.

• 한국멀티미디어학회논문지
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• 제13권7호
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• pp.1000-1015
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• 2010

본 논문에서는 손동작 인식을 위한 새로운 방법을 제안한다. 손 추출을 위한 방법으로는 피부색과 boundary energy 정보를 이용하고 moment method로 손바닥의 중심을 구하게 된다. 손동작 인식은 두 단계로 나눌 수 있다. 첫 번째 단계는 손 형상 인식으로 병렬 신경망을 이용하였다. 손 형상의 패턴을 추출하기 위해서 fitting ellipses method를 이용하였다. fitting ellipses method는 추출된 손 영역을 12개의 타원형으로 분류하고 타원 외곽선의 흰 픽셀 비율을 계산한다. 패턴은 12개의 입력 노드로 신경망에 입력되고 4개의 출력 노드로 출력되는데 각 출력 노드는 0~1사이의 값을 갖게 된다. 손 형상은 4개의 출력 노드의 구성으로 나타낼 수 있다. 두 번째 단계는 손동작 추적과 인식이다. 손동작 추적과 인식을 위해서는 손동작의 위치 정보를 예측 할 수 있는 Kalman Filter를 이용하였다. 실험은 Windows XP상에서 수행되었고 제안한 알고리즘의 효율성을 평가하였다. 손 형상을 인식하기 위해서 300개의 이미지를 인식기에 훈련시키고 200개의 이미지를 실험에 사용하였다. 194개 이상의 이미지가 정확하게 인식 되었다. 그리고 손동작 추적 인식을 실험하기 위해서 1200번의 손동작(각 동작은 400번)을 사용하였고 그 중 1002번의 손동작이 정확하게 인식 되었다.이러한 결과는 제안된 방법이 손 영역을 추출하고 손 동작을 인식하는데 유용함을 확인 할 수 있었다.

• 한국전문물리치료학회지
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• 제11권3호
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• pp.51-58
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• 2004

The purpose of this study was to compare the postural muscle activity during wearing a lead apron with and without applying waist belt at working posture. Ten healthy male subjects were recruited for this study. Electromyography using a surface EMG recorded the activity of the splenius capitis, trapezius, and erector spinae. EMG activity was recorded at quiet standing, 45 degrees of neck flexion, 45 degrees of neck flexion with 15 degrees of trunk flexion. The testing order was selected randomly. The subjects were asked to maintain the each posture for 3 minutes. The mean root mean square (RMS) of EMG activity was calculated. EMG activity was normalized using the maximum voluntary isometric contraction (MVIC) elicited using a manual muscle testing technique. Two-factor repeated measures analysis of variance (ANOVA) was used to compare the average RMS value of EMG activity for each condition. The EMG activity of trapezius muscle was significantly decreased with applying waist belt (p<.05). The muscle activity of splenius capitis and erector spinae showed significant difference according to postures (p<.05). These results suggest that applying waist belt during wearing a lead apron will be useful to prevent shoulder pain.

• 복식문화연구
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• 제11권3호
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• pp.375-386
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• 2003

The purpose of this study is to seek the change of body surface according to cycling motions and to give suggestions to the pattern and spare space between body and wear in each bodily parts to be heavily considered for making the bicycle wear. The cycling motions were analyzed by taking the sequential pictures of cycling covering motion by a digital camera. The experiments with gypsum were toward a woman in her twenties. We draw the line standard of the body's surface, separated their gypsum-replicated fragments of body's surface following the analyses of the change in their lengths. As the motions were made, we decided the degree of the changed length as spare space when compared the erected posture with the cycling posture, presenting the pattern of the cycling wear with the preparation of wears for testing. After that, the essential experiments were conducted toward three cycle players wore our experimental wears. Regards their evaluated appearance, evaluations over three points were obtained from all parameters except the width of front armhole. Accordingly, our experimental wears were remarkably understood as a relatively proper wear as bicycle wear.

• 항공우주기술
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• 제8권1호
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• pp.207-214
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• 2009

본 연구는 미세중력 모델인 머리하향기울기(Head Down Tilt; HDT) 자세에서 운동 중저산소호흡이 심혈관계 반응에 미치는 영향을 알아보는데 있었다. 8명의 건강한 남성($23{\pm}2$ 세, 신장 $176{\pm}4$ cm, 체중 $75{\pm}8$ kg)은 4가지 조건(앉은 자세에서 정상공기 호흡: SN, 앉은 자세에서 13% 산소호흡; SH, HDT 자세에서 정상공기 호흡; SH, HDT 자세에서 13% 산소호흡; HH)에서 최대산소섭취량의 약 40% 운동강도로 15분간 싸이클링을 실시하였다. 심박수는 SH그룹이 SN그룹보다 높았고(p<0.05), HH그룹이 SH그룹보다 높게 나타났다(p<0.05). 혈중산소포화도는 SH그룹이 SN그룹보다 유의한 감소를 나타내었다(p<0.05). 이완기혈압(p<0.05) 및 평균동맥압(p<0.05)은 안정시 앉은 자세에서보다 HDT 자세에서 유의하게 낮아졌다. 체액변인인 Hb, Hct과 전해질 변인인 나트륨, 칼륨, 염소는 모든 그룹에서 차이가 나타나지 않았다(p>0.05). 대사적 변인 중 Lactate는 SH그룹이 SN그룹보다 유의한 증가를 나타내었다(p<0.05). 결론적으로, 저산소호흡과 자세의 이중자극은 심혈관계반응에 영향을 주지 않았다.

• 한국전문물리치료학회지
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• 제22권1호
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• pp.9-18
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• 2015

This study aimed to compare the characteristics of breast cancer surgery and shoulder surgery patients on the shoulder range of motion (ROM), degree of pain and dysfunction, and scapular position. This study was carried out with a total of 90 women: a breast cancer surgery group (BS, $n_1=30$), a shoulder surgery group (SS, $n_2=30$) and a control group ($n_3=30$). Shoulder ROM, the Quadruple Visual Analogue Scale (QVAS), the Shoulder Pain and Disability Index (SPADI), and the Scapular Index (SI) were used to assess shoulder function. Statistical analyses were performed using a one-way analysis of variance, crosstab test, and independent sample t-test. Post-hoc testing was carried out with Bonferroni test. There were significant differences in shoulder ROM when the BS and the SS were compared with the control group. However, there was no significant difference in ROM between the BS and SS. Furthermore, there was a significant difference in shoulder pain between both surgery groups, and there was greater shoulder dysfunction in the SS than in the BS. There was also a significant difference in upper extremity posture when the BS and the SS were compared to the control group. Finally, there was no significant difference in upper extremity posture between the BS and the SS. This study compared shoulder ROM, pain, dysfunction, and upper extremity postures between the BS and SS. While there were no significant differences in shoulder ROM, pain, and upper extremity posture between both surgery groups, the level of dysfunction was found to be significantly different. Therefore, health professionals managing for breast cancer surgery or shoulder surgery patients should consider these outcomes.

• 한국전문물리치료학회지
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• 제27권1호
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• pp.1-10
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• 2020

Background: Thoracic spine self-mobilization exercise is commonly used to manage patients with neck pain. However, no previous studies have investigated the effects of thoracic spine self-mobilization exercise alone in patients with chronic neck pain. Objects: The purpose of this study was to investigate the effects of thoracic self-mobilization using a tool on cervical range of motion (ROM), disability level, upper body posture, pain and fear-avoidance beliefs questionnaire (FABQ) in patients with chronic neck pain. Methods: The subjects were 49 patients (21 males, 28 females) with chronic neck pain. The subjects were randomly divided into an experimental group (EG, n = 23) and control group (CG, n = 26). For the EG, thoracic self-mobilization was applied. We placed a tool (made with 2 tennis balls) under 3 different vertebral levels (T1-4, T5-8, T9-12) of the thoracic spine and the subjects performed crunches, which included thoracic flexion and extension in supine position. Five times × 3 sets for each levels, twice a week, for 4 weeks. Cervical pain, disability, upper body posture, FABQ results, and ROM were evaluated at baseline, after 4 weeks of intervention, and at 8 weeks of follow-up. Assessments included the quadruple visual analogue scale (QVAS); Northwick Park neck pain questionnaire (NPQ); craniovertebral angles (CVA), forward shoulder angle (FSA) and kyphosis angle (KA) measurements for upper body posture; FABQ and cervical ROM testing. Results: The EG showed a statistically significant improvement after intervention in the QVAS (-51.16%); NPQ (-53.46%); flexion (20.95%), extension (25.32%), left rotation (14.04%), and right rotation (25.32%) in the ROM of the cervical joint; KA (-7.14%); CVA (9.82%); and FSA (-4.12%). Conclusion: These results suggest that, for patients with chronic neck pain, thoracic self-mobilization exercise using a tool (tennis balls) is effective to improve neck pain, disability level, the ROM, and upper body posture.