Hebei Institute of Physical Education

This paper systematically reviews the research evolution and current status in the field of distribution network outage cause analysis. The review indicates that, alongside the high proportion of renewable energy integration and the digital transformation of distribution networks, current research faces challenges including prominent misclassification of “pseudo-outages”, fragmented analytical methodologies, and overreliance on single-model approaches such as random forests. While existing work has made progress in user profiling, multi-source data fusion, and deep learning applications, it generally suffers from issues such as ambiguous boundary conditions, methodological singularity, and insufficient system flexibility. To this end, this paper innovatively proposes a future direction for transitioning towards a “multi-agent collaborative” analytical paradigm: defining clear event discrimination boundaries, constructing a hierarchical architecture comprising specialised feature extraction agents, multi-disciplinary expert judgement agents, and collaborative decision-making agents, and extending its application to decision optimisation for enhancing distribution network reliability. This framework aims to integrate the strengths of physical knowledge, data-driven approaches, and agent-based tools, thereby enhancing system interpretability, analytical speed, and assessment accuracy in complex scenarios. It provides an innovative theoretical pathway and practical reference for intelligent operation and maintenance of distribution networks within the context of new power systems.

With the rapid development of the economy and lifestyle changes, people's physical activity levels have significantly decreased, leading to a decline in their physical health. Especially for teenagers and college students, due to increased academic pressure and increased dependence on electronic products, their exercise time has significantly decreased. In addition, the development of big data technology provides new methods and means for studying the relationship between physical activity and health promotion. Through big data analysis, we can gain a more comprehensive understanding of the impact of physical activity on health, providing a scientific basis for developing effective health promotion strategies. This study aims to explore the relationship between physical activity and health promotion through big data and reveal the mechanism of the impact of physical activity on health indicators in different populations. (1) Data collection: use big data to collect multidimensional data on physical activity, dietary behavior, body composition, etc., covering populations of different ages, genders, and regions. (2) Data analysis: statistical analysis to mine the collected data and analyze the correlation and causal relationship between physical activity and health indicators. (3) Intervention research: Based on the analysis results, design and implement a physical activity intervention plan, and monitor the intervention effect in real time through big data. The study found that (1) physical activity is significantly correlated with health indicators such as body composition, mental health, and quality of life. (2) The physical activity intervention program implemented through the big data platform has achieved significant results in improving participants' physical activity levels and health indicators. (3) Based on big data analysis, personalized physical activity intervention strategies for different populations have been proposed, improving the accuracy and effectiveness of the intervention. This study confirms the positive impact of physical activity on health promotion through big data analysis and proposes a big data-based intervention strategy for physical activity. Big data technology provides new perspectives and methods for the study of physical activity and health promotion, which helps to develop more accurate and effective health promotion policies. At the same time, it focuses on the differences in physical activity needs among different background populations, explores more targeted intervention measures, and strengthens interdisciplinary cooperation.

ABSTRACT Micro‐expression recognition (MER) is a technology that infers emotions or intentions by analyzing subtle changes in facial expressions. It is often used to identify deception or assist interpersonal communication and holds significant value. Currently, MER technology is advancing rapidly; however, several challenges remain. To address the insufficient capture of local features and high computational complexity in MER, this paper proposes a novel lightweight network architecture. We introduce a Hierarchical Interactive Multi‐scale Pyramid Network (HIM‐PyraNet) that identifies key facial muscle movement regions while considering inherent spatial relationships between facial landmarks, differing from most existing studies using self‐attention mechanisms. HIM‐PyraNet comprises two main components: a Cross‐Region Interaction Attention (CRIA) module focusing on local temporal features and a Multi‐scale Feature Pyramid Fusion (MFPF) module integrating local and global semantics. Specifically, the face is divided into four distinct regions: left eye, right eye, left lip, and right lip. The CRIA module captures local micro‐muscle movements with region‐specific self‐attention, while the MFPF module learns interactions between eye and lip regions. This strategy effectively reduces the processing area for facial MER, successfully builds facial regional collaboration, and retains the local detailed features of expressions while reducing computational parameters. Experiments on SAMM, CASME II, and SMIC datasets show that with only 0.25M parameters, our model achieves 85.31% average recognition accuracy and 75.3 frames per second (FPS) inference speed. Compared with existing methods, this architecture demonstrates higher accuracy with a low parameter count, providing an innovative solution for real‐time micro‐expression analysis on edge devices.

This trial was designed to evaluate the effects of 4D PRO suspension rope exercise combined with the Mulligan technique in non-specific low back pain (NLBP) patients by musculoskeletal ultrasound and clinical indicators. Sixty patients were randomly divided into the suspension group and the control group for eight weeks. The two groups were also treated with the Mulligan manipulation. The suspension group was treated combined with suspension rope training, while the control group was treated combined with traditional rehabilitation training. Pain, lumbar function and spinal range of motion were measured by a specialist before and after treatment. In addition, musculoskeletal ultrasound was used to measure the thickness of bilateral transversalis and multifidus muscles. After eight weeks, muscle thickness of bilateral transversalis and multifidus muscles, NRS, ODI and spinal range of motion in two groups were significantly better than those before treatment (P<0.05)). The suspension group showed significantly improvement compared to the control group regarding pain, lumbar function, spinal range of motion and the thickness of bilateral transversalis and multifidus muscles(P<0.05). 4D PRO Suspension rope training may be an effective exercise as an adjunctive therapy with Mulligan technology in non-specific low back pain.

BackgroundGolf is a sophisticated sport that integrates precision, skillfulness, and strategic thinking, with swing techniques of different clubs exhibiting distinct biomechanical characteristics. This study aims to investigate the biomechanical characteristics of golfers’ full swings with different clubs from kinematic and dynamics perspectives, thereby providing insights for optimizing full swing techniques.MethodsTen low-handicap right-handed college male golfers were recruited, and their full swing parameters with the driver, 5-iron, and 7-iron (each club was successfully collected 10 times) were synchronously collected using a 250 Hz infrared motion capture system and a 1000 Hz three-dimensional force platform. A one-way ANOVA was conducted to compare biomechanical indicators during the swing motion across different clubs.ResultsThere were significant kinematic differences between the driver and irons, yet smaller differences between 5-iron and 7-iron. As a whole, irons showed a faster peak time and a smaller angular velocity. The GRF of different clubs exhibited different dynamic characteristics at various swing moments, yet the dynamic regularity remained consistent throughout the full swing. During the downswing, the horizontal angular impulse of the driver was greater than irons, and the frontal angular impulse of the 5-iron was greater than that of both driver and 7-iron.ConclusionsThe characteristics of the driver are slow – paced energy accumulation, delayed acceleration, and horizontal sweeping shots; the characteristics of the 5-iron are that the leading arm coordinates with the frontal angular impulse to optimize the shot trajectory; the characteristics of the 7-iron are compact transition and precise shots driven by the torso.

To review and evaluate the advantages and disadvantages of minimally invasive treatment techniques for tibial plateau fractures (TPFs), as well as the research progress and limitations. The relevant domestic and international research literature on the minimally invasive treatment of TPFs in recent years was reviewed. The advantages, disadvantages, and clinical efficacy of various technologies were summarized and analyzed, and an outlook on future development trends was provided. Surgery remains the primary method for treating displaced TPFs. Although traditional open reduction and internal fixation has advantages such as direct reduction and simplicity of procedure, it has gradually fallen out of favor with clinical orthopedic doctors due to extensive soft tissue removal, excessive bleeding, tissue adhesion, and postoperative complications such as skin infection, fracture nonunion, and joint dysfunction. As medical technology continues to develop, minimally invasive surgery and precise diagnosis and treatment are gradually being introduced to orthopedic trauma. Guided by concepts such as "minimally invasive treatment", "homeopathic repositioning of fractures", and "internal compression fixation", many traction reduction devices, internal fixation devices, minimally invasive reduction techniques, and computer-aided navigation technologies have been widely used in the clinical treatment of TPFs. This has greatly helped to overcome the challenges of intraoperative reduction, secondary reduction loss, and postoperative functional impairment and effectively promoting the adoption of minimally invasive treatment techniques in the clinical treatment of TPFs. Minimally invasive treatment techniques have made significant progress in the clinical treatment of TPFs, particularly with regard to the reduction, and have demonstrated unique advantages. While relevant research results have received international recognition, there is still a need for orthopedic scholars to conduct real-world research to further explore the underlying principles and mechanisms of action.

To investigate the biomechanical characteristics of Schatzker type Ⅱ tibial plateau fracture fixed by different bone grafting methods and internal fixations. Twenty-four embalmed specimens of adult knee joint were selected to make Schatzker type Ⅱ tibial plateau fracture models, which were randomly divided into 8 groups (groups A1-D1 and groups A2-D2, n=3). After all the fracture models were restored, non-structural iliac crest bone grafts were implanted in group A1-D1, and structural iliac crest bone grafts in groups A2-D2. Following bone grafting, group A was fixed with a lateral golf locking plate, group B was fixed with lateral golf locking plate combined compression bolt, group C was fixed with lateral tibial "L"-shaped locking plate, and group D was fixed with lateral tibial "L"-shaped locking plate combined compression bolt. Compression and cyclic loading tests were performed on a biomechanical testing machine. A distal femur specimen or a 4-cm-diameter homemade bone cement ball were used as a pressure application mould for each group of models. The specimens were loaded with local compression at a rate of 10 N/s and the mechanical loads were recorded when the vertical displacement of the split bone block reached 2 mm. Then, compressive and cyclic loading tests were conducted on the fixed models of each group. The specimens were compression loaded to 100, 400, 700, and 1 000 N at a speed of 10 N/s to record the vertical displacement of the split bone block. The specimens were also subjected to cyclic loading at 5 Hz and 10 N/s within the ranges 100-300, 100-500, 100-700, and 100-1 000 N to record the vertical displacement of the split bone block at the end of the entire cyclic loading test. The specimens were subjected to cyclic loading tests and the vertical displacement of the split bone block was recorded at the end of the test. When the vertical displacement of the collapsed bone block reached 2 mm, the mechanical load of groups A2-D2 was significantly greater than that of groups A1-D1 ( P<0.05). The mechanical load of groups B and D was significantly greater than that of group A under the two bone grafting methods ( P<0.05); the local mechanical load of group D was significantly greater than that of groups B and C under the structural iliac crest bone grafts ( P<0.05). There was no significant difference ( P>0.05) in the vertical displacement of the split bone blocks between the two bone graft methods when the compressive load was 100, 400, 700 N and the cyclic load was 100-300, 100-500, 100-700 N in groups A-D. However, the vertical displacement of bone block in groups A1-D1 was significantly greater than that in groups A2-D2 ( P<0.05) when the compressive loading was 1 000 N and the cyclic load was 100-1 000 N. The vertical displacement of bone block in group B was significantly smaller than that in group A, and that in group D was significantly smaller than that in group C under the same way of bone graft ( P<0.05). Compared with non-structural iliac crest bone grafts implantation, structural iliac crest bone grafts is more effective in preventing secondary collapse of Schatzker type Ⅱ tibial plateau fracture, and locking plate combined with compression bolt fixation can provide better articular surface support and resistance to axial compression, and the lateral tibial "L"-shaped locking plate can better highlight its advantages of "raft" fixation and show better mechanical stability.

To evaluate the effectiveness and safety of minimally invasive treatment for bilateral tibial plateau fractures using the double reverse traction reducer. The clinical data of 4 patients with bilateral tibial plateau fractures who met the selection criteria and treated between January 2016 and April 2024 were retrospectively analyzed. The cohort included 3 males and 1 female, aged 30-65 years (mean, 52.5 years). Injury mechanisms comprised traffic accidents (2 cases) and falls (2 cases). According to the Schatzker classification, 2 limbs were type Ⅱ and 6 were type Ⅵ. The time from injury to surgery ranged from 5 to 9 days (mean, 7 days). All patients underwent minimally invasive reduction using the double reverse traction reducer. Surgical duration, intraoperative blood loss, and hospitalization time were recorded. Functional outcomes were assessed at last follow-up using the Hospital for Special Surgery (HSS) knee score and range of motion (ROM), while fracture reduction quality was evaluated using the Rasmussen radiological score. All 4 patients successfully completed the procedure without conversion to open reduction. The total mean operation time was 80.25 minutes (range, 73-86 minutes), with a mean total intraoperative blood loss of 132.5 mL (range, 100-150 mL). The mean hospitalization time was 13.5 days (range, 11-16 days). All incisions healed primarily without neurovascular complications. X-ray film at 1 day after operation confirmed satisfactory reduction and articular surface alignment. Follow-up time ranged from 12 to 26 months (mean, 17.0 months). Fractures achieved clinical union at an average of 13 weeks (range, 12-16 weeks). No complication, such as deep vein thrombosis, joint stiffness, post-traumatic arthritis, or implant failure, was observed. At last follow-up, the mean HSS score was 92.9 (range, 90-97), mean knee ROM was 128.1° (range, 115°-135°), and mean Rasmussen radiological score was 16.4 (range, 15-19), with 2 limbs rated as excellent and 6 as good. The double reverse traction reducer facilitates minimally invasive treatment of bilateral tibial plateau fractures with advantages including minimal trauma, shorter surgical duration, precise reduction, and fewer complications, effectively promoting fracture healing and functional recovery of the knee joint.