• 대한원격탐사학회지
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• 제26권4호
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• pp.395-401
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• 2010

영상 강조 기법은 영상의 낮은 명암 대비(contrast)를 노이즈나 블러링(blurring)의 제거, 명암 대비의 증가, 세밀함의 확장 등을 통해 시각적으로 향상시키는 작업을 말한다. 본 논문에서는 기존에 제안되어 온 여러 영상 강조 기법들의 장점을 기반으로 한 Adaptive dynamic range linear stretching(ADRLS) 영상 강조 기법을 제안한다. ADRLS 기법은 입력 영상의 히스토그램 분할과 동시에 adaptive scale factor를 적용하여 다수의 서브 히스토그램을 생성하는 것에 초점을 맞추고 있으며, 생성된 서브 히스토그램은 최종적으로 선형 강조(Linear Stretching, LS) 기법이 적용되어 영상 강조를 수행하게 된다. 제안된 기법의 성능을 검증하기 위해 기존의 히스토그램 선형 강조 기법, 히스토그램 평활화(Histogram Equalization, HE) 기법과 비교 평가하였으며, 그 결과 기존의 기법들에 비해 영상의 과도한 밝기 변화를 억제함으로써 영상의 시각적인 특성을 유지하고, 입력 영상이 갖고 있는 히스토그램의 특성을 보존하는 효과를 보였다.

• PNF and Movement
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• 제11권2호
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• pp.49-56
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• 2013

Purpose : The purpose of this study was compared for rounded scapular between strechting on pectoralis minoor and strengthening on scapular stabilizer muscles. Methods : The main laboratory had an experiment of the exercise for rounded shoulder posture with 30 patients on a pectoralis minor stretching and scapula to stabilize the elastic band to divide into two groups in this study which were conducted. Results : Acromial height measured from changes of the rounded shoulder posture changes before and after workouts; stretching before exercise in the exercise group is from $94.19{\pm}3.47$ to after result of $94.84{\pm}3.19$, and the after exercise of an elastic band pre-exercise in the exercise group is from $93.60{\pm}3.42$ to $88.68{\pm}3.49$, dividing into two groups, which increased significantly. Compared to an acromial height variation results before and after workouts; stretching exercise group made $3.07{\pm}1.43$, $4.91{\pm}2.24$ and elastic band exercise group, $4.91{\pm}2.24$, which shows the difference between the two groups and was not statistically significant. Conclusion : Against a pectoralis minor that cause the findings of this study, RSP proximately shows serratus anterior and the strengthening of trapezius by exercises of the shoulder peaks which decrease in height arbitration scheme of a pectoralis minor stretching effect as shown. Therefore, it is expected RSP patients in clinical intervention methods combined with stretching exercises strengthens muscles against an elastic band exercise effective.

• 대한통합의학회지
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• 제10권2호
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• pp.115-123
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• 2022

Purpose : The hamstring is a group of three muscles, biceps femoris, semitendinosus, and semimembranosus, placed behind the thigh. The hamstring is one of the most commonly injured muscles and usually occurs during high-speed, high-intensity exercise. The purpose of this study was to investigate the effect of static stretching and eccentric exercise of hamstrings on flexibility, strength, and functional performance. Methods : This study was conducted on 28 healthy adults. Subjects were divided into a static stretching group (n=15) and an eccentric exercise group (n=13). Subjects measured hamstring flexibility (active knee extension test), hamstring strength (concentric and eccentric peak torque), and functional performance (triple hop for distance and modified 20 m sprint). The intervention was conducted three times a week for six weeks. To compare the difference between values before and after the intervention, paired t-test was used, and an independent t-test was used to compare between groups. Results : In both groups, the active knee extension test, concentric peak torque, triple hop test, and 20 m sprint significantly increased after the intervention compared to before the intervention (p<.05). However, no significant difference was found in eccentric peak torque after intervention in both groups (p>.05). No significant difference was found between the two groups in the effect on the variables (p>.05). Conclusion : Both interventions were found to be effective for flexibility, concentric strength, and functional performance. Eccentric exercise and static stretching are recommended to improve the flexibility and functional performance of the hamstring. This study's results will be considered essential data on the effectiveness of static stretching and eccentric exercise.

• 한국전문물리치료학회지
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• 제29권1호
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• pp.54-63
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• 2022

Background: Low back and neck pain are two of the most common medical problems in the adult population. It is estimated that between 70% and 80% adults experience an episode of low back pain at least once during their lifetime. Objects: This study aimed to compare the effects of various stretching exercises and muscle energy techniques used for treatment of iliopsoas, quadratus lumborum, and hamstrings of patients with low back pain. Methods: A total of 52 subjects were randomly assigned to the control group (n = 17), the muscle energy technology group (METG, n = 19), and the stretching exercise group (SEG, n = 16). Interventions were performed twice a week for 4 weeks. Outcomes were measured before and after 4 weeks of treatment in the three groups, using the Korean version of the Oswestry Disability Index, the Visual Analogue Scale (VAS), the Fear Avoidance Belief Questionnaire (FABQ), the Finger to Floor test (FTF), the Modified-Modified Schober Test (MMS), and the Trunk Flexion Range of Motion test. Results: This study showed significant reduction in the pre-test and post-test KODI, VAS, and FABQ scores in all the three groups (p < 0.05). The KODI, VAS, FABQ and FTF assessed in this study showed interactions between the groups and the measurement time point (p < 0.01). After intervention, the KODI, VAS, FABQ and FTF in the SEG and METG were significantly higher (p < 0.05), and there was no difference between the METG and SEG. MMS and HFROM test showed no difference between the three groups (p > 0.05). Conclusion: KODI, VAS, FABQ and FTF showed significant improvement after basic physical therapy, muscle energy technique, and stretching exercise intervention. And there was no significant difference in the intervention effect between the muscle energy group and the stretching exercise group.

• 대한물리의학회지
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• 제17권1호
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• pp.109-116
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• 2022

PURPOSE: This study compared the effect of performing gastrocnemius stretching with and without the self-myofascial release of the sole on the active and passive ankle dorsiflexion angles and muscle tone of the gastrocnemius muscle in subjects with short gastrocnemius muscle. METHOD: A total of 23 subjects with short gastrocnemius muscles were included in this study. The study participants were divided into two experimental groups. Group A performed gastrocnemius muscle self-stretching exercises only, while group B performed self-myofascial release of the sole using a massage ball after the gastrocnemius muscle self-stretching exercises. For both groups, the active and passive ankle dorsiflexion angles were measured using a goniometer, and the tone of the gastrocnemius muscle was assessed using the MyotonPRO®. RESULTS: Within-group comparison showed that the participants in both groups A and B had significantly increased active and passive ankle dorsiflexion angles and decreased gastrocnemius muscle tone (p < .05) after performing their respective exercises. However, no significant differences in the said criteria were observed between groups A and B (p>.05). CONCLUSION: The results of this study showed that both methods were effective in increasing active and passive dorsiflexion angles and decreasing muscle tone. Thus, it is recommended to tailor gastrocnemius stretching exercises according to the patient's condition. If the patient does not experience discomfort in the plantar fasciae, it is recommended to perform the gastrocnemius stretching exercise only without myofascial release and use a massage ball afterward.

• PNF and Movement
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• 제21권2호
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• pp.203-212
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• 2023

Purpose: This study aims to confirm the effects of stretching and meditation intervention on mental health-related anxiety, depression, and quality of life in college students in their 20s with sequelae of COVID-19. Methods: 30 men and women were randomly assigned to the stretching and meditation intervention group (10 people), the stretching intervention group (10 people), and the meditation group (10 people), and the experiment was conducted for 4 weeks. As for the analysis method, a paired t-test was performed for intra-group changes after 4 weeks, and one-way analysis of variance was performed for between-group changes. In addition, the significance level was set at 0.05. Results: Within-group changes in anxiety and depression were significantly different in all groups after 4 weeks (p < 0.05). There was a significant difference between SMG and SG and between SMG and MG in the change between groups after 4 weeks (p < 0.05). In the change in quality of life, there was a significant difference in all groups after 4 weeks (p < 0.05). There was also a significant difference between SMG and MG in the change between groups after 4 weeks. Conclusion: Based on the results of this study, the combined method of meditation and stretching intervention had a positive effect on the mental health of adults in their 20s and suggests the possibility of using it to improve mental health after recovering from COVID-19.

• 대한정형도수물리치료학회지
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• 제28권1호
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• pp.39-51
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• 2022

Background: The purpose of this study is to investigate the effect of neck and shoulder self-stretching exercise using audiovisual media on neck pain, postural alignment, and joint position error in women with chronic neck pain. Methods: The subjects included 20 women that gave consent to participate in the study voluntarily. They performed the self-stretching exercises using audiovisual media was carried out 20 minutes 5 times a week during 3 weeks. Neck disability index (NDI) and visual analogue scale (VAS) were used to measure the functional disability and pain, A pressure pain threshold was measured using an algometer, and a cervical range of motion (CROM) measurement tool was used to measure the range of motion and error of proprioceptive position sense of the cervical spine. To assess posture alignment, forward head angle (FHA), forward shoulder angle (FSA) were measured using image J software. Results: The neck pain intensity was statistically significantly within group (p<.05). Neck and shoulder functional disability were a statistically significant difference within group (p<.05). Splenius capitis and upper trapezius pressure pain threshold were statistically significant difference in within group (p<.05). The postural alignment was statistically significantly within group (p<.05). The cervical range of motion in neck extension, right and left lateral flexion were statistically significantly within group (p<.05). The joint position error in neck flexion, extension, right and left lateral flexion decreased statistically significantly within group (p<.05). Conclusion: Self-stretching exercise using audiovisual media increased the mobility of the neck, decreased neck pain and joint position error, and improved posture alignment. As a result, there was a positive effect by applying the self-stretching exercise using audiovisual media to people with neck pain. Based on this, it is thought that it can be used as the basis for research related to home training programs for healthy self-management.

• 한국전문물리치료학회지
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• 제31권1호
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• pp.79-88
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• 2024

Background: The abdominal drawing-in maneuver (ADIM), a method of lumbar stabilization training, is an effective neuromuscular intervention for lumbar instability associated with low back pain (LBP). Objects: The purpose of this study was to compare the effect of a 2-week period of the ADIM and tensor fasciae latae-iliotibial band (TFL-ITB) self-stretching on lumbopelvic rotation angle, lumbopelvic rotation movement onset, TFL-ITB length, and pain intensity during active prone hip lateral rotation. Methods: Twenty-two subjects with lumbar extension rotation syndrome accompanying shortened TFL-ITB (16 males and 6 females) were recruited for this study. The subjects were instructed how to perform ADIM training or ADIM training plus TFL-ITB self-stretching program at home for a 2-week period. A 3-dimensional ultrasonic motion analysis system was used to measure the lumbopelvic rotation angle and lumbopelvic rotation movement onset. An independent t-test was used to determine between-group differences for each outcome measure (lumbopelvic rotation angle, lumbopelvic rotation movement onset, TFL-ITB length, and pain intensity). Results: The results showed that ADIM training plus TFL-ITB self-stretching decreased the lumbopelvic rotation angle, delayed the lumbopelvic rotation movement onset, and elongated the TFL-ITB significantly more than did ADIM training alone. Pain intensity was lower in the ADIM training plus TFL-ITB self-stretching group than the ADIM training alone group; however, the difference was not significant. Conclusion: ADIM training plus TFL-ITB self-stretching performed for a 2-week period at home may be an effective treatment for modifying lumbopelvic motion and reducing LBP.

• Advances in concrete construction
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• 제17권3호
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• pp.127-133
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• 2024

Textile reinforced concrete (TRC) has gained attention as a viable alternative to conventional reinforced concrete due to its improved mechanical properties and design adaptability. Despite significant research into the mechanical properties of TRC, studies regarding the flexural effect of pre-stretching with different numbers of textile reinforcements are currently limited. Therefore, this research focuses on assessing the flexural characteristics of TRC panels with the incorporation of mesh pre-stretching. Additionally, the study compares the flexural behaviour between alkali-resistant (AR) glass fibre TRC and carbon fibre TRC. A three-point bending test was conducted to assess the flexural behaviour of TRC, investigating the impact of the number of textile layers and the application of pre-stretching on flexural strength and post-cracking stiffness. The findings, exhibited by the flexural stress vs. displacement curve, indicate that applying pre-stretching to carbon fibre TRC effectively increases the flexural strength of carbon textiles and enhances post-cracking stiffness. Moreover, the greater the number of carbon textiles, the higher the flexural stress of the specimens, provided the textiles are placed in the tensile zone. Nevertheless, when comparing carbon fibre TRC with AR glass fibre TRC, it is found that the increase in flexural strength is more significant for carbon fibre TRC. Overall, applying pre-stretching to carbon fibre significantly improves the TRC's flexural performance, specifically during the post-cracking stage and in crack distribution. Furthermore, due to the higher elastic modulus and tensile strength of carbon fibre, TRC reinforced with carbon textiles shows greater flexural strength and ductility compared to AR glass fibre TRC.

• 한국산학기술학회논문지
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• 제13권10호
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• pp.4676-4685
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• 2012

본 연구는 저강도 원심성 운동과 동적 스트레칭이 지연성 근육통에 미치는 효과를 비교하고자 시행하였다. 본 연구의 대상자는 연구에 참여하기 5개월 전부터 하지에 규칙적인 운동을 하지 않았던 18명의 20대 건강한 여성을 대상으로 하였다. 대상자들은 전체 3그룹인 대조군, 저강도 원심성 운동군 그리고 동적 스트레칭군에 무작위로 배정되었다. 측정변수로는 최대 수의적 등척성 수축력, 초음파 영상을 통한 근 두께, 근 통증 척도, 무릎관절 가동범위이며 지연성 근육통 유발 전, 유발 후 24시간, 48시간, 72시간에 각각 측정되었다. 저강도 원심성 운동군과 동적 스트레칭군의 운동 프로그램은 지연성 근육통 유발 4주 전에 일주일에 3회씩 각각 시행되었다. 본 연구의 결과 최대 수의적 등척성 수축력과 근 통증 척도에서만 그룹간 유의한 차이가 있었으며(p<.05), 저강도 원심성 운동은 동적 스트레칭에 비해 근 통증 척도가 유의하게 감소하였다(p<.05). 그러므로 저강도 원심성 운동과 동적 스트레칭이 지연성 근육통의 증상 중 근 통증에 효과적임을 제시하며 또한 저강도 원심성 운동이 동적 스트레칭보다 근 통증을 빠르게 감소시킴으로써 근 통증에 더 효과적임을 제시하고자 한다.