• 디지털융복합연구
• /
• 제16권11호
• /
• pp.543-551
• /
• 2018

본 연구는 교정 운동이 전방머리자세 환자의 목뼈 정렬, 압력통증 역치, 통증에 미치는 영향에 대해 알아보았다. 대상자는 목 부위의 통증을 주로 호소하는 환자 중 전방머리자세로 판정되는 30명을 대상으로 연구를 실시하였다. 중재방법으로는 연구군은 등뼈 폄 운동, 네발기기 자세에서 뒤쪽락킹, 그리고 능동 목뼈 돌림 운동과 TECAR치료를 융합하였으며, 대조군은 등뼈 및 목뼈 교정운동만을 적용하였다. 평가는 목 척추 각도, 압력 통증 역치, 목장애지수, 시각적상사척도를 측정하였다. 중재는 2주간 주 6회 실시하였다. 연구결과 두 군 모두 목 척추각도, 압력통증 역치, 목장애 지수, 시각적상사척도에 유의한 차이를 나타내었다. 또한 목 척추각도를 제외한 압력통증역치, 목장애지수, 시각적상사척도에 연구군이 대조군 보다 유의하게 개선되었다. 이러한 결과는 교정 운동과 TECAR 치료를 융합하는 중재 방법이 전방머리자세 환자의 머리 정렬과 통증 및 일상생활능력에 보다 긍정적인 영향을 미친다고 사료된다.

• 국제물리치료학회지
• /
• 제7권2호
• /
• pp.1066-1070
• /
• 2016

The purpose of this article was to investigate the effects of Maitland's transverse movement on change of pain, trunk flexion movement and Cobb's angle in patient with upper thoracic scoliosis. The subject are 37 years old with chronic low back pain participated in this study and has no experience surgery within the last six months due to back pain. 10 set was applied 10 times on the T3-T5 applied the transverse movement with grade IV to each segment by skilled physical therapist. Transverse movement was applied convex toward the concave side. Pressure pain threshold was reduced from 4/10 to 2/10. Trunk flexion range that is the distance between the middle finger and floor was increase from 7.3cm to 2cm. Cobb's angle was decreased from degree 18 to 16. This result demonstrated that the Maitland's transverse movement was benefit to reduce the pain and Cobb's angle, and to increase the trunk flexion movement.

• Physical Therapy Rehabilitation Science
• /
• 제10권2호
• /
• pp.147-155
• /
• 2021

Objective: This study is to investigate the effect of real-time feedback from the therapist on posture, muscle strength, pain of subjects with forward head posture based on a non-face-to-face complex exercise program. Design: Two-group pretest-posttest design. Methods: Thirty healthy men and women in their twenties with forward head posture with a Craniovertebral angle of 52° or less were targeted, the final selection was made as 15 experimental groups who performed the non-face-to-face intervention program while receiving real-time feedback and 15 control subjects who performed the non-face-to-face intervention program without providing feedback. Six of them were eliminated, and a total of 24 were conducted as subjects. All exercise groups performed an exercise program three times a week, 30 minutes each, for a total of two weeks. Before and after exercise, Craniovertebral angle (CVA), CranioRotation angle (CRA), muscle strength, and tenderness threshold were evaluated. Results: Significant differences were shown in both groups in CVA, and tenderness threshold before and after exercise (p<0.05), and CRA, the left middle trapezius muscle strength, only in the experimental group (p<0.05). In the comparison of theamount of change between exercise groups, the group that received feedback on CVA, CRA and tenderness threshold showed a significant change than the group without feedback (p<0.05). Conclusions: As a result of this study, it can be seen that the therapist's real-time feedback is more effective in improving the forward head posture. This requires feedback from the therapist on posture correction during non-face-to-face exercise intervention.

• 한국정밀공학회지
• /
• 제16권8호
• /
• pp.178-185
• /
• 1999

In tool condition monitoring systems, parameters should be set to a certain threshold. In many cases, however, the threshold is dependent on cutting conditions, especially the radial immersion ratio. In this presented is a method of on-line estimation of the radial immersion ratio in face milling. When a tooth finishes sweeping, a sudden drop of cutting force occurs. The force drop is equal to the cutting force that acting on a tooth at the swept angle of cut and can be acquired from cutting force signals in feed and cross-feed directions. Average cutting force per tooth period can also be calculated from cutting force signals in two directions. The ratio to cutting forces in two directions acting on a tooth at a certain swept angle of cut and the ratio of average cutting forces in two directions per tooth period are functions of the swept angle of cut and the ratio of radial to tangential cutting forces. Using these parameters, the radial immersion ratio is estimated. Various experiments are performed to verify the proposed method. The results show that the radial immersion ratio can be estimated by this method regardless of other cutting conditions.

• The Journal of Korean Physical Therapy
• /
• 제30권5호
• /
• pp.166-172
• /
• 2018

Purpose: This study compared the different sling and resistance exercises on pelvic rotation during active straight leg raises (ASLR) and on pain in patients with chronic low back pain (CLBP). Methods: Twenty subjects were divided randomly into a sling group (SG) and a resistance exercise group (REG). Internal oblique (IO), external oblique (EO), rectus abdominis (RA), and rectus femoris (RF) muscle activity; pelvic rotation angle during ASLR; and visual analogue scale, pressure pain threshold were measured. Sling and resistance exercises were then performed for 30 minutes and the measurements taken again. Results: Both groups showed significantly lower RF muscle activity and significantly higher EO and IO muscle activity (p<0.05). The RA muscle activity decreased significantly in the SG, but increased significantly in the REG (p<0.05). The pelvic rotation angle was significantly lower in the SG (p<0.05). The pain press threshold increased significantly in both groups (p<0.05). The visual analogue scale decreased significantly in the SG (p<0.05). Conclusion: Both exercises appear to be beneficial for modifying the muscle activity and pain control in the intervention of CLBP. On the other hand, the sling was more effective in increasing the pressure threshold than resistance exercise, and the pelvic rotation angle was reduced. Therefore, both exercises can help patients with CLBP change their muscle activity and control pain. CLBP patients should use a sling for short periods of time to learn to reduce the pain and control pelvic rotation.

• 한국전문물리치료학회지
• /
• 제27권2호
• /
• pp.102-110
• /
• 2020

Background: There is an opinion that improper postures of the head and cervical spine are associated with temporomandibular joint (TMJ) disorders (TMDs). Objects: The aim of this study was to investigate the proportions among the cervical kyphotic angle, physical symptoms including the pain intensity level of the TMJ, and severity of TMD disability in patients diagnosed with TMD. Methods: Sixty-two subjects participated in the study. The evaluation tools included measurements of the cervical kyphotic angle based on the Ishihara index, pressure pain threshold (PPT) on the TMJ, maximal mouth opening (MMO) without pain, current pain intensity level of the TMJ measured using the Quadruple Visual Analogue Scale (QVAS), Korean TMD (KTMD) disability index, KTMD Symptom Frequency/Intensity Scales (SFS/SIS), and Korean Headache Impact Test-6. Correlation analysis was conducted to investigate the correlations between the cervical kyphotic angle and parameters related to TMJ symptoms. Results: Variables that were significantly correlated with the cervical kyphotic angle were the PPT around the TMJ (r = 0.259, p < 0.05), current pain intensity level of the TMJ based on the QVAS (r = -0.601, p< 0.01), and usual pain intensity level based on the SIS (r = -0.379, p < 0.01). The level of TMD functional disability was significantly correlated with the degree of headache (r = 0.551, p < 0.01), level of PPT of the TMJ (r = -0.383, p < 0.01), pain-free MMO (r = -0.515, p < 0.01), pain intensity level of the TMJ based on the QVAS (r = 0.393, p < 0.01), TMD symptom frequency (r = 0.739, p < 0.01), usual pain intensity of the TMJ (r = 0.624, p < 0.01), and most severe pain intensity of the TMJ (r = 0.757, p < 0.01). Conclusion: There is a positive correlation between the cervical kyphotic angle and PPT and a negative correlation between the current and usual pain intensity levels of the TMJ. The cervical kyphotic angle was a predictor of the pain level, tenderness threshold, and intensity of pain in the TMJ.

• 융합정보논문지
• /
• 제11권11호
• /
• pp.31-37
• /
• 2021

본 논문에서는 무선 센서 네트워크에서 이상치를 포함한 수신 신호 강도와 신호의 도달 각도 측정치 기반의 표적위치추정 성능 저하를 방지하기 위한 이상치 검출 알고리즘 C-SCGP를 제안한다. 센서 오작동, 재밍, 심한 잡음과 같은 다양한 이상치 원인으로 인해 표적 위치추정 정확도가 크게 떨어질 수 있어, 모든 이상치를 탐지하고 제거하는 것이 중요하다. 이러한 이상치를 제거하기 위해 single cluster graph partitioning (SCGP) 알고리즘이 널리 사용되고 있다. 기존의 SCGP 알고리즘은 hyperparameter 최적화를 통한 threshold 설정과 이상치 확률 계산이 필수적이므로 다양한 분야에 효율적인 적용이 제한되어왔다. 본 논문에서 제안된 continuous-SCGP (C-SCGP) 알고리즘은 이러한 SCGP의 약점을 극복한다. 다양한 잡음 환경에서 threshold 설정과 이상치 확률 계산이 필요 없는 제안된 C-SCGP 알고리즘과 threshold 설정과 이상치 확률 계산을 요구하는 SCGP 알고리즘의 이상치 제거 성능이 같음을 최종 추정된 표적의 RMSE 성능을 통하여 검증하였다.

• 한국정밀공학회지
• /
• 제33권3호
• /
• pp.217-223
• /
• 2016

In this paper, the movement of a liquid metal droplet in a channel by continuous electrowetting effect is analyzed. The channel is fabricated using two glass substrates and silicone rubber as spacers, and a mercury droplet and dilute sulfuric acid are added into the channel. The droplet is moved according to voltage applied at both ends of the channel through an electrolyte. According to the shape of the droplet and the applied voltage, the velocity of the droplet is changed. The velocity is proportional to the applied voltage and inversely proportional to the length of the droplet, both theoretically and experimentally. Contact angle hysteresis and a meniscus change were also found in the moving state. This implies the existence of a threshold in movement by Laplace pressure difference. The experiment indicated that the sliding angle was inversely proportional to the width of the droplet but that the voltage threshold was proportional to the width.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2000년도 ITC-CSCC -1
• /
• pp.62-65
• /
• 2000

In this paper we propose skewed angle detection methods for images that contain text that is not aligned horizontally. In most images text areas are aligned along the horizontal axis, however there are many occasions when the text may be at a skewed angle (denoted by 0 < ${\theta}\;{\leq}\;{\pi}$). In the work described, we adapt the Hough transform, Shadow and Threshold Projection methods to detect the skewed angle of text in an input image using the orthogonal angle view property. The results of this method are a primary text skewed angle, which allows us to rotate the original input image into an image with horizontally aligned text. This utilizes document image processing prior to the recognition stage.

• 대한기계학회논문집B
• /
• 제32권2호
• /
• pp.141-148
• /
• 2008

A numerical simulation of brushless DC motor is performed to elucidate thermo-flow characteristics in winding and bearing with heat generation. Rotation of rotor and blades drives influx of ambient air into the rotor inlet. Recirculation zone exists in the tiny interfaces between windings. The flow separation causes poor cooling performance in bearing part and therefore the redesign of the bearing groove is required. The design parameters such as the inlet location, geometry and bearing groove threshold angle have been selected in the present simulation. As the inlet location moves inward in the radial direction, total incoming flow rate and heat transfer rate are increased. Total incoming flow rate is increased with increasing the inlet inner length. The effect of the bearing groove threshold angle on the thermal performance is less than that of other design parameters.