Background: Lumbar radiculopathy caused by disc herniation is frequently accompanied by pain, functional disability, and impairments in sensorimotor control, including reduced proprioception and altered motor control. Interventions that integrate neural and mechanical components may enhance rehabilitation outcomes beyond exercise alone. Objectives: To investigate the effects of manual therapy combined with neurodynamic exercise and motor control exercise (MTN) with motor control exercise alone (MCE) on lumbar proprioception, motor control, and functional disability in patients with lumbar radiculopathy. Design: Randomized, single-blind clinical trial. Methods: Thirty patients with lumbar radiculopathy due to L4–S1 disc herniation were randomly assigned to either the MTN group or the MCE group. Both groups participated in supervised interventions three times per week for six weeks. The MTN group received lumbar joint mobilization and slider-based neurodynamic mobilization integrated with motor control exercise, whereas the MCE group performed motor control exercise only. Lumbar proprioception was assessed using joint position error during trunk flexion and extension. Motor control was evaluated using pressure biofeedback–based abdominal drawing- in performance. Functional disability was assessed using the Korean version of the Oswestry Disability Index. Outcomes were measured at baseline and during follow-up. Results: Significant group-by-time effects were observed for lumbar joint position error, motor control outcomes, and functional disability. The MTN group demonstrated earlier and greater improvements across all outcome measures compared with the MCE group, whereas improvements in the MCE group were more gradual. Conclusion: Compared with motor control exercise alone, the addition of manual therapy and neurodynamic exercise resulted in superior improvements in lumbar proprioception, motor control, and functional disability. An integrated MTN approach may be an effective rehabilitation strategy for patients with lumbar radiculopathy.

Synovial chondromatosis is a rare benign metaplastic disorder of the synovial membrane, characterized by the formation of multiple cartilaginous nodules within the joint cavity. Involvement of the temporomandibular joint (TMJ) is particularly uncommon and often presents with clinical features that closely resemble internal derangement or osteoarthritis, frequently resulting in diagnostic delay and inappropriate management. Recognizing the distinctive clinical, radiologic, and histopathological characteristics of synovial chondromatosis is essential for accurate and timely diagnosis. In this report, we review the features of synovial chondormatosis of the TMJ and describe a case involving a 73-year-old female who presented with pain during mastication without limitation of mouth opening. Radiologic examination demonstrated multiple calcified nodules within the left TMJ space. Given the wide range of TMJ-related pathologies, such as myofascial pain and degenerative changes, which often present with similar symptoms, the identification of characteristic imaging and histopathologic findings is crucial for distinguishing synovial chondromatosis from other TMJ disorders and ensuring appropriate treatment. Through presentation of our clinical observations and a review of relevant literature, we aim to assist clinicians in recognizing synovial chondroamtosis of the TMJ and avoiding misdiagnosis, thereby facilitating prompt and effective patient care.

기후 변화로 인한 강우 강도의 증가로 도시 우수 배제시설의 설계 기준이 상향되고 있으나, 노후 하수관로는 오히려 변형과 통수 효율 저하 문제를 겪고 있다. 다양한 노후화 유형 중에서도 이음부 관 침하로 인한 관정렬 교란은 국부적인 역구배, 퇴적물 누적, 추가적인 손실수두를 유발하는 주요 요인이다. 본 연구에서는 관 침하가 배수 성능에 미치는 수리적 영향을 평가하기 위해, 경사 2°의 직경 600 mm 원형 우수관을 대상으로 전산유체역학 해석을 수행하였다. 해석 영역은 맨홀 간 40 m 하수관로 구간을 모델링하였으며, 그중 10 m 구간은 경사 변형이 존재하도록 설정하였다. 상류단(P1)과 하류단(P2) 간의 압력 차이를 이용해 국부 손실수두(Δhloc)와 손실계수(K)를 계산하였고, 수정된 Manning 식을 통해 등가 조도계수(nnew)를 산정하였다. 해석 결과, 관 처짐각이 0°에서 14°로 증가함에 따라 압력 손실은 0 Pa에서 1,298 Pa로, 손실계수(K)는 0.00에서 0.293으로 증가하였으며, 이때 등가 조도계수(nnew)는 약 6% 상승하였다. 본 연구결과는 노후 하수관로의 관침하 현상이 에너지 손실과 수리 저항을 크게 증가시킴을 보여주며, 도시 배수 시스템에서 관 침하로 인한 성능 저하를 정량적으로 평가할 수 있는 근거를 제시한다.

The human body has many degrees of freedom (1-3 degrees of freedom) per joint, enabling smooth and stable walking. However, unlike humans, robots require many more joints, and their design necessitates the control of numerous motors. However, controlling more motors leads to lower walking stability. Therefore, this paper studies a real-time control method for stable walking of a bipedal robot. To enable stable walking of a bipedal robot with 12 degrees of freedom, we study a method for generating and supplementing walking patterns between each joint using numerical analysis of the multi-joint robot's kinematics and learning-based AI. This research is to apply the adaptive control of neuron networks for the real-time attitude control of Multi-articulated robot. Multi-articulated robot is expressed with a complicated mathematical model on account of the mechanic, electric non-linearity which each articulation of mechanism has, and includes an unstable factor in time of attitude control. If such a complex expression is included in control operation, it leads to the disadvantage that operation time is lengthened. Thus, if the rapid change of the load or the disturbance is given, it is difficult to fulfill the control of desired performance. In this research we used the response property curve of the robot instead of the activation function of neural network algorithms, so the adaptive control system of neural networks constructed without the information of modeling can perform a real-time control. The proposed adaptive control algorithm generated control signs corresponding to the non-linearity of Multi-articulated robot, which could generate desired motion in real time.

Symptomatic joint degeneration is a common chronic musculoskeletal disorder worldwide. The literature has noted that some clinicians find treating this condition “technically challenging,” while others find it to be “unchallengingly routine.” We believe that all clinicians treating symptomatic joint degeneration should have a robust understanding of the mechanobiological interactions between the synovial lining, synovial cells, synovial fluid, articular cartilage, and subchondral bone. This four-part narrative review describes how inner lining synovitis and cellular changes in the subchondral region, including the development of bone marrow edema, are symptom generators in some patients with various grades of joint degeneration. This review suggests that physical therapists (PTs) should acquaint themselves with the concept of mechanotransduction and more fully consider cellular mechanosensitivity and mechanoresponsiveness as exercise loading and manual interventions loads are placed upon joints with degenerative change. We call for additional research efforts in the area of protocol development for low-load exercise intervention and between PTs and physicians who may have access to laboratory facilities and imaging equipment. This research could allow for both direct and indirect assessment of intra-articular pressure, synovial fluid, and bone marrow edema after the application of therapeutic exercise and joint mobilization.

Existing reinforced concrete building structures have seismically-deficient details on columns and beam–column joints; therefore, accurate modeling of structural behavior is required for reliable seismic performance assessment. This study aims to investigate the differences in dynamic responses resulting from modeling variations through developing four distinct numerical models. Separate models were established to simulate flexural and shear failures of columns and beam–column joints. Using these component-level models, a structural analysis model of the target building was constructed, and nonlinear time-history analyses were performed to evaluate seismic performance. Based on the simulated dynamic behavior of the target building, soft-story mechanisms were identified, and it was identified and confirmed that column behavior plays a dominant role in governing the overall structural response.

이 글은 반폐쇄해인 태국만에서 한 세기 이상 지속되어 온 태국-캄보디 아 간 해양 분쟁의 복잡한 연원과 해양경계 협상을 살펴보고, 대륙붕 공동 개발 등 양국 간 해양 분쟁 관리의 핵심적 틀로 여겨지는 2001년 ‘해양경계획정 및 공동개발체제 수립에 관한 양해각서(MoU44)’의 쟁점 과 법적 성질을 규명하는 것을 목적으로 한다. 양국 간 국경분쟁은 1907년 프랑스-샴 조약과 부속 지도에 대한 해석에 서 비롯되었다. 1907년 부속 지도는 양국 간 합의로 프랑스 지도회사가 제 작한 것으로, 육상 경계는 자연 분수령을 따르기로 하였다. 프레아 비헤아 르 사원이 캄보디아 영토로 표기되었다는 점에 대해 태국이 이의를 제기하 면서, 양국 모두 영유권을 주장하는 지역이 생겨났다. 1962년 국제사법재 판소는 이 사원이 캄보디아에 속한다고 판정하였고, 2013년 사원 주변 지 역에 대해서 1962년 결정을 재확인하였다. 그러나 양국 간 육상 영토 분쟁 은 현재에도 이어지고 있다. 양국 간 해상 분쟁은 1907년 부속 지도상 꼬꿋섬(Koh Kut)과 연결된 선에 대한 상반된 해석에서 비롯되었다. 캄보디아는 이 선을 해양 경계선으 로 보면서 꼬꿋섬에 대한 영유권을 주장하였다. 태국은 이를 육상 국경 설 정을 위한 시야선으로 보았고, 실효적 지배를 근거로 영유권을 주장하였다. 1972년 캄보디아가 과도한 직선기선을 선포하여 주장중첩수역(OCA)을 형 성하면서 분쟁은 격화되었다. 태국만 내 약 26,000㎢에 달하는 OCA는 막 대한 양의 탄화수소 자원이 매장되어 있을 것으로 추정되어서 양국 간 첨 예한 대립의 원인이 되었다. 양국의 타협 없는 주장으로 인해 해양경계획정 협상은 결국 교착 상태에 빠지게 되었다. 이러한 교착 상태를 타개하기 위해 2001년 체결된 MoU44는 이원적 접 근법(Dual Track Approach)을 채택하였다. 이는 OCA 북부 지역의 경계 획정과 자원이 풍부한 남부 지역의 공동 개발을 동시에 추진하는 것을 핵 심으로 한다. 그러나 MoU44의 가장 큰 실패 요인이자 근원적 한계는 불 가분 패키지(Indivisible Package) 조항이라고 할 수 있다. 이 조항은 두 트랙의 합의가 연계되어서, 어느 한쪽의 합의 없이는 다른 쪽 합의도 효력을 발휘될 수 없도록 규정하였다. 결국 양국 간 현실적으로 해결이 어려운 꼬꿋섬 영유권 및 해양경계획정 문제로 인하여 실용적 협력이 가능한 공동 개발 논의가 발목 잡히면서, 불가분 패키지는 MoU44 체제 전체를 마비시 키는 구조적 요인으로 작용하였다. MoU44는 최종적 권리·의무를 확정하는 실체적 조약이 아니라, 합의 도출을 목표로 하는 ‘향후 합의를 위한 의사표시’(agreement to agree) 로서의 법적 성질이 강하다. 한편으로 MoU44는 양국에 UNCLOS 제74 조 및 제83조에 규정된 ‘잠정조치 의무’를 구체화하는 법적 의미를 지 닌다. 즉, MoU44는 양국에 실질적인 잠정 약정(공동 개발 등) 체결을 위해 ‘신의성실하게 교섭할 절차적 의무’를 부과하고, 최종 합의를 위태 롭게 하는 일방적 행위(자원 탐사 및 개발 등)를 삼가야 할 ‘자제 의 무’를 강화하는 역할을 한다. 결론적으로 MoU44는 분쟁의 근본 원인을 해결하지 못한 채 오히려 불 가분 패키지라는 조항으로 인해 UNCLOS상의 잠정조치 의무 이행마저 형 해화시키는 결과를 초래한 것으로 평가할 수 있다. 따라서 향후 분쟁 해결 을 위해서 양국은 경직된 일괄 타결 조항에서 벗어나, 태국-말레이시아 공 동 개발 사례처럼 경계획정 문제를 잠정적으로 유보하고 공동 개발을 우선 추진하는 유연한 접근법을 모색하거나, 동티모르-호주 사례처럼 제3자 개 입을 통한 해결 방안을 적극적으로 고려해 볼 필요가 있다. 아울러 이 사례 는 한·일 대륙붕 공동개발협정의 미래에도 중요한 시사점을 제공할 수 있으 며, 한·일 해양경계협정에 대비한 철저한 준비의 필요성을 역설해 주고 있 다.

Background: Neck discomfort and movement limitations are common musculoskeletal problems among modern people. While cervical and thoracic joint mobilization are widely used interventions for cervical dysfunction, research comparing their immediate effectiveness in adults with asymmetrical cervical rotation is limited. Objectives: To compare the immediate effects of cervical versus thoracic joint mobilization in adults with adults with asymmetrical cervical rotation and discomfort. Design: Randomized controlled trial. Methods: Thirty adults with left-right differences in cervical rotation of more than 5 degrees were randomly assigned to a cervical mobilization group (CMG, n=15) or thoracic mobilization group (TMG, n=15). Both groups received Grade III mobilization for 15 minutes. Range of motion (ROM), pain (VAS), and neck disability index (NDI) were measured before and after intervention. Results: Both groups showed significant increases in ROM after intervention (P<.001). Within-group analysis revealed that the TMG showed significant pain reduction (P<.01) and significant reduction in left-right rotation asymmetry (P<.001), while the CMG showed improvement in ROM but no significant changes in asymmetry or pain (P>.05). Neither group showed significant changes in NDI. Between-group comparisons showed no significant differences in any outcome measures. Conclusion: Both cervical and thoracic joint mobilization increased cervical range of motion in adults with asymmetrical cervical rotation discomfort. The TMG demonstrated significant within-group improvements in left-right rotation asymmetry and pain reduction, suggesting potential clinical benefits of thoracic mobilization for certain aspects of cervical dysfunction.

본 연구는 외부 환경 조건에 따른 줄눈 콘크리트 포장의 상·하부 상대습도 차이를 분석하기 위해 실험 데이터를 활용 한 유한요소해석을 수행하였다. 실험은 300mm × 260mm × 2000mm 크기의 콘크리트 시편을 대상으로 진행되었으며, Strain gauge를 이용해 상·하부 변형률을 측정하고, LVDT 센서를 통해 상단부 연직 변위를 기록하였다. 항온항습기를 이용해 온도를 25°C로 유지한 상태에서 상대습도를 65%, 35%, 35% + 풍속(약 4 m/s)의 세 가지 조건으로 설정하여 실 험을 진행하였다. 구조해석은 ABAQUS를 이용하여 수행하였으며, 하부 상대습도를 100%로 고정한 상태에서 상부 상대습도를 도출하는 방법을 적용하였다. 직접적인 상대습도 도출 시 곡률을 일정하다고 가정해야 하는 문제가 발생하여, 응력해석을 기반으 로 등가선형온도차(ΔT)를 적용하는 방식을 채택하였다. ABAQUS에서 깊이 260mm에 대해 선형 ΔT 값을 부여하여 열 변형을 유도하고, 이를 실험값과 비교하여 조정한 후 최종적으로 ΔT 값을 상대습도로 변환하였다. 그 결과, 시간에 따른 상부 상대습도의 변화를 도출할 수 있었으며, 외부 환경 조건(습도 및 풍속)에 따른 상대습도 변화 경향을 확인하였다. 본 연구 결과는 향후 수분 확산 해석 연구 및 국내 환경을 반영한 JCP 상대습도 변화 모델 개발에 기초 자료로 활용될 것으로 기대된다.

A 34-year-old male patient presented with a gradual facial asymmetry and occasional discomfort in the right temporomandibular joint (TMJ). Initial evaluation, including panoramic radiography, suggested facial asymmetry secondary to condylar elongation. However, computerized tomography and magnetic resonance imaging demonstrated the existence of a condylar mass and multiple calcified lesions within the right TMJ. The patient did not recognize any occlusal changes, but it was suspected that the occlusion had changed based on the cast analysis. The patient underwent a condylectomy and mass excision, which confirmed the diagnosis of osteochondroma with concurrent synovial chondromatosis. Approximately three weeks of postoperative physical therapy were required to achieve stable occlusion. This case is notable for two reasons. First, the simultaneous occurrence of osteochondroma and synovial chondromatosis is extremely rare. Second, the gradual occlusal changes associated with TMJ lesions can go undetected, increasing the chance of misdiagnosis.

In this study, a performance evaluation was conducted on a composite elastic asphalt precast expansion joint developed to replace steel expansion joints that frequently suffer from various damages, such as blow-up owing to increased traffic volume and abnormal weather. Two types of elastic asphalt binders were prepared by mixing a latex-based modifier, and their basic properties and performance were evaluated. Elastic asphalt binders were mixed with 8–13 and 13–19 mm aggregates to prepare elastic asphalt joint mixtures, and their permanent deformation and adhesive performance were evaluated using Hamburg wheel-tracking and direct-shear tests. Elastic asphalt joint blocks and internal reinforcement for crack prevention were applied to produce the elastic composite expansion joints, and their performance was evaluated through contraction–extension tests to determine fatigue cracking, maximum load during contraction– extension, and repeated contraction–extension tests. As a result of the performance evaluation of the developed elastic asphalt binder, both the high- and low-temperature performances were improved, and the temperature sensitivity was superior to that of general asphalt binders, exhibiting high resistance to cracking. In addition, the joint block specimens manufactured by mixing the elastic asphalt binder with 13–19 mm aggregates exhibited excellent permanent deformation in the dynamic stability and Hamburg wheel-tracking tests, and they had higher adhesive performance than the method of repairing with rapid-hardening concrete materials at low and room temperatures, where significant contraction of the concrete joint occurs. We confirmed that when a compression spring-type reinforcement was applied, the compressive force for contraction decreased significantly compared with the unreinforced state, and the tensile force for extension increased, thereby reducing the stress applied to the mixture itself. The composite elastic asphalt precast expansion joint developed in this study is expected to have superior durability against cracks and secure continuity with the road surface through the tensile force dispersing effect using expansion reinforcement. Thus, it has better drivability than the existing steel expansion joint and can absorb shocks such as vibrations and noise applied to a structure.

Friction welding, which uses heat and plastic flow to join metals, is expanding across industries due to its ability to weld heterogeneous alloys and simple process. However, process research is essential for materials with complex geometries, and limited research has been conducted on friction welding between cast and sintered metals. This study analyzed the mechanical properties and microstructural evolution of the joint by controlling the rotational speed and friction pressure, which affect the removal of the heat-affected zone in friction welding of casted SCM440 and sintered F-05-140. Hardness mapping and microstructure observations with material transition were performed to investigate the correlation between phase behavior and welding conditions. These results are anticipated to reduce costs and improve the mechanical properties of key mobility components.