In this research, the concrete breakout strength in tension of cast-in-place anchors (CIP) is experimentally investigated to be used as fundamental data for the seismic fragility analysis of equipment in nuclear power plants. Experimental variables are chosen, such as the embedment depth of the anchor, single/group anchor configurations, diameter of the head plate, and crack width. Monotonic and cyclic loading are applied to all types of specimens. As measured from the experiments, concrete breakout strength in tension is 1.5 to 2 times higher than the expected strengths from concrete capacity design (CCD) method-based model equations. In alignment with the model’s predictions, concrete breakout strength increases with deeper embedment depth, and the strength of group anchors also increases based on the expansion of the projected concrete failure area. This study also explores the effects of head plate diameter and crack width, which are not considered in the model equation. Experimental results show that the diameter of the head plate is not directly correlated to the concrete breakout strength, whereas the crack width is. The presence of cracks, with widths of 0.3 mm and 0.5 mm, leads to reductions of approximately 7% and 17%, respectively, compared to single anchors in non-cracked concrete.

탄소보강근(Carbon Fiber Reinforced Polymer)은 탄소섬유를 에폭시로 결합한 것으로 높은 인장강 도와 강한 내부식성으로 철근대체재로 각광받고 있다. 하지만 결합재인 에폭시의 특성상 고온에 취약 하다. 따라서 고온에 노출된 탄소보강근의 인장 시험을 통해 인장강도 및 탄성계수의 변화를 관찰하고 온도별 거동특성을 파악하고자 한다. 사용된 탄소보강근의 직경은 10mm이며 나선모양의 GFRP(Glass Fiber Reinforced Polymer) 리브로 구성되어있다. 인장 시험체는 ASTM D 7205에 따라 강관으로 구 성된 그립부 700mm, 자유단 500mm 총길이 1,900mm로 제작하였다. 시험체 중앙부를 고온에 노출시 키기 위해 가열부 200mm의 퍼니스를 배치하였으며, 온도범위는 50~550℃이다. 시험결과 유리전이온 도인 150℃까지는 고온에 노출된 시험체가 상온 시험체에 비해 인장강도가 2.7~3.1% 감소하였으며, 탄성계수는 15.7~18.7% 감소하였다. 이후 250~550℃에서는 인장강도가 8.9~54.3% 감소하였고, 탄성 계수는 17.2~20.1% 감소하였다. 따라서 인장강도의 경우 550℃에서 최대 인장강도의 절반 이상으로 감소하는 것을 확인 하였고, 탄성계수는 인장강도에 비해 크게 감소하지 않는 것을 확인하였다.

Background: Most non-pharmacological interventions for tension-type headache (TTH) focus on direct intervention in areas associated with headaches, with limited research exploring the indirect effects of interventions utilizing the fascia. Objectives: To investigate the effects of superficial back line (SBL) stretching and head-neck massage interventions on the range of motion (ROM) and neck disability index (NDI) of TTH. Design: Randomized controlled trial. Methods: The study participants were randomly allocated into three groups: SBL stretching group (n=9), head-neck massage group (n=9), and combined group (n=9). Prior to the intervention, measurements were taken for neck flexion ROM, straight leg raising test (SLRT) ROM, and NDI. The intervention consisted of 30-minute sessions conducted twice a week for 8 weeks. The second measurement took place 4 weeks after the intervention, followed by a third measurement conducted after an additional 4 weeks of intervention. Results: Comparing neck flexion ROM within each group, a significant increase was observed in the SBL stretching group after 8 weeks compared to before the intervention (P<.05). Regarding the comparison of SLRT ROM within each group, a significant increase was noted after 8 weeks compared to before the intervention in the SBL stretching, head-neck massage, and combined groups (P<.05). In terms of the comparison of NDI within each group, a significant decrease was observed in all three group after the intervention compared to before the intervention (P<.05). Conclusion: 8-week intervention involving SBL stretching, head-neck massage, and their combined application demonstrated effectiveness in improving neck flexion ROM, SLRT ROM, and the NDI for individuals with TTH.

The Moving Particle Semi-implicit (MPS) method is one of most famous method in the particle-based computational fluid dynamics field. The MPS, the state-of-art method, is simple but intuitive methodology including multi-phase and complex structure interactions problems. However, the concept of particle method may contain the physical weakness. In order to avoid physical violence, the particle number density and kernel function were employed. Despite all the efforts, the microscopic problems were not easily resolved yet. In this study, the surface tension model was developed and added into the MPS method to strengthen physical phenomena and physics laws. The simulation result with new MPS method including surface tension model was compared with corresponding theoretical results and they show good-agreement.

Recently, it is being carried out the project to evaluate the properties of materials harvested from nuclear reactor after the decommissioning of Kori Unit 1. However, it is not sufficient adequate machining equipment and remote machining technique to perform the projects for evaluation of materials harvested from nuclear reactor. Thus, it is required to develop the remote machining technique in hotcell to evaluate the mechanical properties of nuclear reactor materials. The machining technique should be performed inside a hotcell to evaluate mechanical properties of materials harvested from nuclear reactor and is essential to prevent radiation exposure of workers. Also, it is essential to design the apparatus and develop the machining process so that it can be operated with a manipulator and minimize contamination in hotcell. In this research, development of remote specimen machining technique in hotcell such as machining apparatus, technique and process for compact tension specimens of material harvested from nuclear reactor are described. Remote machining technique will be useful in specimen machining to evaluate changes in mechanical properties of materials harvested in high-radioactive reactor. Also, it is expected that various types of specimens can be machining by applying the developed machining technique in the future.

Background: The muscles associated with tension-type headache (TTH) are connected to the scalp fascia, which is firmly attached to the superciliary ridge of the frontal bone. However, there is a paucity of data on treatments for TTH that directly target the scalp fasciae. Objectives: We aimed to validate a new manual therapy to treat TTH by applying myofascial relaxation techniques to the scalp and to examine the changes in quality of life and headache characteristics after treatment. Design: pretest-posttest control group design study. Methods: Total 24 participants with TTH (10 males, 14 females) participated in the study. Manual therapy group (MT) received standard manual therapy and scalp myofascial release technique group (SMT) received scalp myofascial release technique twice per week for 4 weeks. Brief Pain Inventory (BPI) and Headache Impact Test (HIT) for quality of life, headache frequency, duration, and Visual Analog Scale (VAS) for intensity were assessed at the pre- and post-treatment. Results: There was a significant improvement within groups in headache frequency (MT P<.05, SMT P<.001), duration (MT P<.05, SMT P<.01), VAS (MT P<.01, SMT P<.001), HIT (MT P<.001, SMT P<.001), and BPI (MT P<.001, SMT P<.001) between the pre- and post-treatment. Group differences were significant for headache duration (P=.027), but the others were not. MT and SMT reduced the impact of headaches on daily life. Also Headache frequency, duration, intensity, and BPI were improved. Conclusion: MT and SMT reduced the impact of headaches on daily life. Also Headache frequency, duration, intensity, and BPI were improved. It has been suggested that both MT and SMT can be used as a non-invasive treatment to treat the TTH, and to improve the quality of life.

음악 공연 무대는 연주자가 해당 음악이 표현하는 생각과 감정을 가창, 음악 공연 등을 통해 관객에게 전달하여 관객으로 하여금 수준 높은 음악적 향연을 즐기게 한다. 그러나 실제 공연 과정에서 많은 요인의 영향을 받아 연주자들은 공연 전, 공연 중, 공연 후에 긴장, 불안, 우울, 두려움과 같은 부정적인 감정을 쉽게 느끼는 경향이 있다1). 이러한 감정은 공연 무대 효과에 직접적인 영향을 미친다. 수용적 음악 요법은 주로 치료 받는 사람으로 하여금 수동적으로 음악을 듣게 함으로써 심리적 스트레스를 완화하고 안정적인 감정 상태를 유지하도록 한다2). 음악 공연 무대에서 수용적 음악 요법의 적용 효과를 탐구하기 위해 본고는 주로 연구 목적 및 의의, 연구 방법 및 범위, 선행 연구, 수용음악 요법 개론, 수용적 음악 요법이 중국 음악 공연 무대 에서의 적용 의의, 현재 중국 음악 공연 무대 주요 문제점, 음악 공연 무대의 긴장 완화와 감정 조절에 있어서 수용적 음악 요법의 역할, 사례 분석이라는 8가지 측면에서 연구를 전개하고자 한다. 본고는 2019년 1월부터 2021년 1월까지 중국에서 음악 공연을 한 15명 연주자들을 대상으로 수용적 음악 치료 전후 긴장 완화 및 감정 조절 효과에 대해 설문조사를 실시하였다. 조사한 결과, 수용적 음악 치료 후 연주자들의 감정 상태가 크게 개선된 것으로 나타났다. 상대적으로 안정되고 좋은 감정 상태를 되찾으며 음악 연주를 원활하게 진행할 수 있게 되었다.

목적 : 본 연구는 정상 안압 녹내장(NTG) 환자에서 양안시 기능을 평가하고자 한다. 방법 : 대상자 총 64명 중 안과에 내원하여 전문의에게 정상 안압 녹내장 진단을 받은 환자 정상 안압 녹내장 41명과 정상안 26명을 대상으로 하였다. 시야검사, 안압검사, 망막신경섬유층 두께 측정을 시행하였으며, 양안 시 기능 평가를 위해 사위각, 폭주근점검사, 티티무스와 TNO 입체시 검사를 시행하였다. 검사결과는 SPSS 22.0을 이용하여 분석하였으며 양안시 스크리닝과 입체시 기능을 분석하기 위해 ROC 곡선을 이용하여 분석하였다. 결과 : 정상안압 녹내장군에서 망막신경섬유층 두께와 남아있는 시야가 감소하였다. 원근거리 폭주여력은 정상 안압 녹내장군에서 정상군보다 높게 나타났다. 티티무스 입체시는 정상안압 녹내장군에서 102.36±4.40"이며 정상군에서는 44.61±1.85"으로 나타났으며, TNO 입체시는 정상안압 녹내장군에서 231.97±30.96"이며 정상군에서는 89.42±12.02"으로 나타났다. ROC 곡선은 티티무스와 TNO 입체시 검사에서 각각 0.797과 0.807로 나타 났고, 민감도와 특이도는 티티무스 입체시 검사에서 각각 0.737, 0.731, TNO 입체시 검사에서는 각각 0.500, 0.115로 나타났다. 결론 : 티티무스 입체시검사는 정상 안압 녹내장 선별에 유용할 것으로 사료된다.

본 논문에서는 포스트 텐션으로 보강된 아웃리거 벽체의 부등기둥축소량 저감 효과를 확인하였다. 아웃리거 벽체 시스템을 사용할 경우 콘크리트 부재를 아웃리거로 사용하기 때문에 아웃리거 벽체의 장기거동도 고려해야 한다. 아웃리거 벽체은 깊은 보의 형태로 전단 응력이 지배적이기 때문에 전단 응력을 받는 콘크리트의 장기거동에 대한 이론 연구를 수행하였고 그 결과를 유한요소해석에 적용하였다. 아웃리거의 장기거동 고려 시 부등기둥축소량과 아웃리거에 작용하는 전단력을 확인하였으며, 설계 변수인 아웃리거의 두께를 변경해가며 해석하였다. 해석 결과 부등기둥축소량은 증가하고 아웃리거에 작용하는 전단력은 감소함을 밝혔으며 아웃리거의 강성이 작을수록 그 효과가 크다는 것을 밝혔다. 이후 아웃리거의 장기거동으로 인해 증가한 부등기둥축소량을 감소시키기 위해 포스트 텐션 공법으로 보강하는 방법을 제안하고 그 효과를 확인하였다. 프리스트레스 도입 직후의 프리스트레스 손실과 장기거동에 의한 프리스트레스 손실을 모두 고려하였다. 해석 결과 포스트 텐션 공법의 뛰어난 부등기둥축소량 저감 효과를 확인하였으며, 프리스트레스의 크기가 증가할수록 그 효과가 증가함을 밝혔다.

Background: Tension-type headaches, which make up the highest proportion of headaches, are prone to develop into chronic tension-type headaches (CTTH). The characteristic of CTTH in patients is that the active myofascial trigger point (ATrP) which causes pain in the muscles of the back of the head is increased, compared to the normal headache and moves the head position forward. Objective: The aim of this study was to investigate the effects of myofascial release (MFR) and posture correction in effectively improving neck function and sleep quality in the symptoms of CTTH patients. Design: Observer-blind study Methods: To reduce ATrP, MFR was applied and exercise was also applied to correct posture. The subjects of this study were 48 individuals randomly divided into three groups; The MFR group using the MFR technique; The MFR with exercise group subject to both the MFR technique and forward head position correction exercises (MFREx), and the control group. MFR and MFREx groups were given the relevant interventions twice a week for four consecutive weeks, and went through the number ATrPs, range of motion (ROM) of neck, Neck Disability Index (NDI) and the Pittsburgh Sleep Quality Index (PSQI) before and after the intervention. A physical therapist, who was fully familiar with the measuring methods of the equipment, was the measurer and not aware of the target's condition was blinded to take measurements only before and after intervention. Results: There was a significant improvement in the ATrP, Neck ROM, NDI and PSQI in the group of patients to whom the MFR technique and MFREx were applied. MFREx was more effective in increasing neck mobility. Conclusions: According to this study, the application of MFR is effective in improving neck movement and sleep quality in chronic tension headache patients.

This paper presents the theoretical analysis for the flow driven by surface tension and gravity force in an inclined circular tube. The previously developing equation for Power-Law model is a simple ordinary differential type. A governing equation is developed for describing the displacement of a non-Newtonian fluid(Casson model) that continuously flows into a circular tube by surface tension, which represents a second-order, nonlinear, non-homogeneous, and ordinary differential form. It was found that the theoretical predictions of the governing equation were in good agreement with the results for considering the Newtonian model.

In this paper, the shape adjustment algorithm of the spoked wheel cable structures with retractable membrane system is studied. The initial tension of the membrane or cable is necessary to form the structure and its value is determined by the design shape. However, due to internal and external environmental influences, its shape may be different from the initial designed shape. In the case of the cable structures covered in this study, tension adjustment is necessary to maintain the designed shape because it influences the tension of the cable depending on the state of the retractable membrane. Therefore, we proposed an adjustment algorithm of an initial shape based on the force method. The effectiveness and validity of the methodology were examined through the applicable cable structures. The results of the shape adjustment analysis of the symmetric spoked wheel cable model were reliable and accurate results were obtained.

The BX composite beam is designed to have the same cross-section regardless of the size of the momentum, which is a disadvantage of the existing steel structure. Combination of the H-beam end compressive material and the H-section steel tensile reinforcement according to the moment size in a single span, It is possible to say that it is an excellent synthesis which increases the performance. When underground and overhead structures are constructed, it is possible to reduce the bending, increase lateral stiffness, reduce construction cost, and simplify joints. The seamability of the joining part is a simple steel composite beam because of the decrease of the beam damping at the center of the beam and the use of the end plate of the new end compressing material. In the case of structures with long span structure and high load, it is advantageous to reduce the material cost by designing large steel which is high in price at less than medium steel.