Repair Scheme Research Articles

Repairing Reed-Solomon Codes via Subspace Polynomials

We propose new repair schemes for Reed-Solomon codes that use subspace polynomials and hence generalize previous works in the literature that employ trace polynomials. The Reed-Solomon codes are over \mathbb F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q^<i>l</i></sub> and have redundancy r = n-k ≥ q <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sup> , 1 ≤ m ≤ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> , where n and k are the code length and dimension, respectively. In particular, for one erasure, we show that our schemes can achieve optimal repair bandwidths whenever n=q <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>l</i></sup> and r = q <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sup> , for all 1 ≤ m ≤ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> . For two erasures, our schemes use the same bandwidth per erasure as the single erasure schemes, for <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> /m is a power of q, and for <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> = q <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a</sup> , m=q <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sup> -1 > 1 ( a ≥ b ≥ 1), and for m ≥ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> /2 when <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> is even and q is a power of two.

Research on Maintenance Management of Flexible Pavement Based on C-LTPP

Based on the Canadian Long-Term Pavement Performance (C-LTPP) data, this paper chooses the road performance related data as variable factors. According to the Dipstick detection results, the characteristic values such as rut depth, wheel track width and cross section area are extracted to describe the rutting. This paper established the relationship between the pavement rutting and the cumulative service time, determined the rutting evaluation index, and proposed the pavement maintenance time threshold. Comparing the flexible layer overlay repair schemes used in various test points, it provides a reference for the pavement performance management decision-making and the road repair scheme design after repair.

A societal transition of MSW management in Xiamen (China) toward a circular economy through integrated waste recycling and technological digitization

Recently Xiamen (China) has encountered various challenges of municipal solid waste management (MSWM) such as lack of a complete garbage sorting and recycling system, the absence of waste segregation between organic and dry waste at source, and a shortage of complete and clear information about the MSW generated. This article critically analyzes the existing bottlenecks in its waste management system and discusses the way forward for the city to enhance its MSWM by drawing lessons from Hong Kong's effectiveness in dealing with the same problems over the past decades. Solutions to the MSWM problem are not only limited to technological options, but also integrate environmental, legal, and institutional perspectives. The solutions include (1) enhancing source separation and improving recycling system; (2) improving the legislation system of the MSWM; (3) improvement of terminal disposal facilities in the city; (4) incorporating digitization into MSWM; and (5) establishing standards and definitions for recycled products and/or recyclable materials. We also evaluate and compare different aspects of MSWM in Xiamen and Hong Kong SAR (special administrative region) under the framework of 'One Country, Two Systems' concerning environmental policies, generation, composition, characteristics, treatment, and disposal of their MSW. The nexus of society, economics of the MSW, and the environment in the sustainability sphere are established by promoting local recycling industries and the standardization of recycled products and/or recyclable materials. The roles of digitization technologies in the 4th Industrial Revolution for waste reduction in the framework of circular economy (CE) are also elaborated. This technological solution may improve the city's MSWM in terms of public participation in MSW separation through reduction, recycle, reuse, recovery, and repair (5Rs) schemes. To meet top-down policy goals such as a 35% recycling rate for the generated waste by 2030, incorporating digitization into the MSWM provides the city with technology-driven waste solutions.

Evaluating the safety integrity of safety systems for all values of the demand rate

The knowledge about the possible influence of demands on the reliability of safety systems comes from a long way back in time. In IEC 61508 this has been taken care of by indicating two different ways to evaluate the safety integrity of SIS: low demand and high demand mode. The main focus of this paper lies in the intermediate and high demand modes. We investigate the effect of the demand on the system hazard rate when the failed states of individual components are detected during a demand. Component failures can then be repaired before the occurrence of the failure of the safety system. The results of this paper show that the system hazard rate exhibits an unexpected behaviour in the intermediate to high demand region. It is also shown that depending on the SIS repair scheme, the use of Probability Failure per Hour (PFH) based on the equations for a continuous demand as proposed in IEC 61508 leads to very conservative results in the high and continuous demand regions. New asymptotic equations are proposed to evaluate the PFH of kooN systems for all values of the demand rate, together with new associated rules for discrimination of the demand regions.

An Optimal Tree-Structured Repair Scheme of Multiple Failure Nodes for Distributed Storage Systems

To reduce recovery cost of repairing multiple failed nodes, many repair schemes have been proposed for erasure codes based distributed storage systems. However, most of the existing researches ignore the network topology of storage devices. Motivated by such considerations, we combine delay repair schemes with network topology and propose a tree-structured model based on fountain codes with large value of (n, k, r) to improve the repair efficiency. More precisely, with the consideration of network topology, a new target named data recovery cost is defined to measure the efficiency of coded fragment download and source file reconstruction, and then the optimal recovery threshold is derived to minimize the average data recovery cost of general tree-structured model. Moreover, we analyze and compare the average data recovery cost of general tree-structure with different systematic parameters. To further improve the data transmission efficiency, an optimal tree-structured scheme based on improved tabu search algorithm (ITSAORT) is proposed. Compared with other algorithms, the ITSA-ORT scheme uses Prim algorithm to generate the initial solution and then uses special method to obtain the corresponding neighborhood structure. The experimental results show that the proposed scheme can find a globally optimal solution and obtain lower cost of data recovery. In addition, the ITSA-ORT scheme has lower computational complexity than the optimal tree-structured scheme based on particle swarm optimization algorithm (PSO-ORT) and the optimal tree-structured scheme based on firefly algorithm (FA-ORT).

Discussion on construction scheme of aqueduct structure repair and water stop belt replacement in South-to-North Water Diversion project

Taking Shahe and Dalang River aqueducts as an example, this paper introduces a movable and reusable waterproof device for aqueduct construction, which is suitable for construction scheme of structure repair and waterstop belt replacement for large-scale water delivery aqueduct of Shahe River and Dalang River in South-to-North Water Diversion Project. It aims to solve structural damage and waterstop belt leakage of the aqueducts of Shahe River and Dalang River in the South-to-North Water Diversion Project, realizing the aqueduct construction with uninterrupted water supply, and structure repair and waterstop belt replacement in the waterless environment separated by watertight device in the aqueduct construction.

Enabling Optimal Access and Error Correction for the Repair of Reed–Solomon Codes

Recently Reed-Solomon (RS) codes were shown to possess a repair scheme that supports repair of failed nodes with optimal repair bandwidth. In this paper, we extend this result in two directions. First, we propose a new repair scheme for the RS codes constructed in [Tamo-Ye-Barg, IEEE Transactions on Information Theory , vol. 65, May 2019] and show that repair is robust to erroneous information provided by the helper nodes while maintaining the optimal repair bandwidth. Second, we construct a new family of RS codes with optimal access for the repair of any single failed node. We also show that the constructed codes can accommodate both features, supporting optimal-access repair with optimal error-correction capability. Going beyond RS codes, we also prove that any scalar MDS code with repair bandwidth attaining the cutset bound affords a repair scheme with optimal access property.

Aspirin modified strontium-doped β-tricalcium phosphate can accelerate the healing of femoral metaphyseal defects in ovariectomized rats

The purpose was to observe whether local administration Strontium (Sr) and Aspirin (Asp) can enhance the efficacy of β-Tricalcium phosphate(β-TCP) in the treatment of osteoporotic bone defect. The MC3T3-E1 cells were co-cultured with β-TCP, Sr/β-TCP, Asp-Sr/β-TCP scaffold and induced to osteogenesis, and the cell viability, mineralization ability were observed by MTT, Alizarin Red staining(ARS) and Western blotting(WB). Then this scaffolds were implanted into the femoral epiphysis bone defect model of ovariectomized(OVX) rats for 8 weeks. X-ray, Micro-CT, histology and Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) analysis were used to observe the therapeutic effect and explore the possible mechanism. MTT, ARS results show that the cell mineralization and viability of Asp-Sr/β-TCP group is significantly higher than Control group, β-TCP group and Sr/β-TCP group. Protein expression show that the osteogenic protein expression such as ALP、OP、RUNX-2、OC and COL-1 of Asp-Sr/β-TCP group is significantly higher than Control group, β-TCP group and Sr/β-TCP group. X-ray images, Micro-CT and Histological analysis evaluation show that, group Asp-Sr/β-TCP presented the strongest effect on bone regeneration and bone mineralization, when compared with β-TCP group and Sr/β-TCP group. RT-qPCR analysis show that Asp-Sr/β-TCP, β-TCP group and Sr/β-TCP group showed increased BMP2, Smad1, OPG than the OVX group(p < 0.05), while Asp-Sr/β-TCP exhibited decreased TNF-α、IFN-γ and RANKL than the OVX group(p < 0.05). Our current study demonstrated that Asp-Sr/ β-TCP is a scheme for rapid repair of femoral condylar defects, and these effects may be achieved by inhibiting local inflammation and through BMP-2/Smad1 and OPG/RANKL signaling pathway.

Experimental and numerical investigation of underwater composite repair with fibre reinforced polymers in corroded tubular offshore structural members under concentric and eccentric axial loads

Repair of offshore steel structural members become essential due to the corrosive marine environment in which they exist. Structural repair using composite material has significant advantages in these cases than the conventional repair by welding or bolting steel sleeves. However, the composite repair technology with fibre reinforced polymers (FRP) is not very well established for their usage on load bearing offshore steel structural members either in underwater or above water conditions. The study had attempted to do a pilot experimental study on steel tubular members under the combination of axial compression and bending loads to address this gap in knowledge. The specimens were grouped into four categories: intact, corroded, repaired in air and repaired underwater. The repair scheme remained the same for in air and underwater repairs with one layer of glass and two layers of carbon fibre reinforced polymers, but with resin and repair methodology being different for both. The repaired specimens showed notable improvement in the ultimate strength from the corroded members to match the intact strength. Underwater repairs proved to be adequate to replicate the ultimate strength achieved by the conventional in air repairs. Investigations into parameters like load displacement behaviour, energy absorption, ductility and strain values also revealed that the underwater repair performed very similar to the conventional in air repair. A simplified Finite Element model simulating the repaired specimens was also presented in the paper which had predicted the experimental behaviour with great accuracy. In conclusion, the underwater and above water repair of structural steel tubular members using FRP composite materials seem a very viable solution for the corroded load bearing members in the offshore industry, however more detailed study on long term performance and cyclic behaviour of the composite repaired members is yet to be carried out.

Deformation Mechanism and Control Technology of Surrounding Rock in the Deep-Buried Large-Span Chamber

The selection of the support scheme for deep-buried and large-span chambers has been a severe problem in underground engineering. To further study the mechanical mechanism of large deformation, based on the repair engineering of the chambers of Pingdingshan No.6 mine in China, the field investigation, laboratory test, numerical simulation, and theoretical analysis were studied. The surrounding rock of the central substation chamber (CSC) and the main pumping chamber (MPC) were classified according to the rock mass rating (RMR) classification method, and the main factors affecting the stability of the surrounding rock of the chambers were revealed. A prediction model of mechanical parameters of the surrounding rock was established based on the Hoek-Brown failure criterion. Additionally, the prediction results were used in FLAC3D to further analyze the failure of the original support scheme, and the feasibility of the restoration plan was proposed. Six key points of support technology for this kind of chamber were put forward. Comprehensive support and repair scheme, including “bolt, metal mesh, shotcrete, grouting, anchor cable, and combined anchor cable,” was put forward. The engineering practice indicated that the deformation rate was less than 0.7 mm/d, which was beneficial to the long-term stability of CSC and MPC. The implementation of this restoration project can provide a reference for other similar projects.

The clinical study of partial perineum area and wound repair in males

To explore the suitable division of male genitalia subunits and the effectiveness of large-area perineum defect repair under its guidance. According to the anatomical and functional characteristics of male genitalia, the subunit division scheme was proposed: area Ⅰ, glans penis; area Ⅱ, body of penis; area Ⅲ, scrotum; area Ⅳ, scrotum. Between April 2017 and July 2019, 12 patients with large genitalia defects were treated, with an average age of 60.9 years (range, 57-66 years) and an average disease duration of 2.7 years (range, 2-5 years). The defect area involved area Ⅰ in 1 case, area Ⅱ in 7 cases, area Ⅲ in 5 cases, and area Ⅳ in 8 cases; the size of area ranged from 6 cm×4 cm to 23 cm×16 cm. The causes of defect included 3 cases of trauma, 6 cases of Paget disease, 2 cases of squamous cell carcinoma, 1 case of spindle cell tumor. According to the design of the corresponding repair scheme, the main repair methods were to rotate and advance the skin flap and pedicled skin flap in the same area. When the defect was large, the free skin flap transplantation, free skin grafting, and free mucosa transplantation were used to repair the defect. All the patients were followed up 6-13 months with an average of 8.6 months. Skin flap, skin graft, and mucosa survived in one stage in 10 patients; infection occurred in 1 case after the scrotal flap of area Ⅲ was transferred to repair the defect in area Ⅱ, 1 case had distal venous crisis at 2 days after repair area Ⅲ defect used free anterolateral thigh flap, and after active treatment, the condition improved. The appearance of the receiving area and the supplying area was good, and the local feeling was recovered satisfactorily. The range of motion of hip joint was good in 10 cases, and 2 cases were slightly stretched but did not affect normal life. All patients had normal urination and defecation function, and were satisfied with the treatment effectiveness. The subunits of male genitalia can be used to guide the repair of the defect, which can better restore the physiological appearance and function, and has positive clinical significance.

A distributed self-healing coverage hole detection and repair scheme for mobile wireless sensor networks

The most fundamental task of the wireless sensor network (WSN) is to monitor a specified region of interest with sufficient sensor coverage. This task is jeopardized when coverage holes appear after the network's deployment. The emergence of coverage holes is unavoidable for many reasons such as sensor node energy depletion, physical damage, or external attacks. Therefore, it is important to have an ongoing mechanism for coverage maintenance because coverage holes can have debilitating effects on network performance if left unattended.Existing research into coverage hole repair tend to suffer from several shortcomings such as high energy consumption of mobile nodes and inaccurate assumptions about the coverage hole model. Furthermore, many solutions rely on the availability of redundant nodes or deploying new nodes in the network, which is not always feasible. We present a novel distributed self-healing algorithm called distributed hole detection and repair (DHDR), that simultaneously handles both hole detection and repair using only nodes already deployed in the network. Our algorithm can dynamically detect a coverage hole as it occurs, and accurately estimate its position and size. The algorithm selects suitable nodes from the vicinity which will maximize coverage and minimize energy consumption by sharing information and coordinating their movements. The selected nodes relocate in a way that restores the void area of a hole without disrupting their existing coverage or connectivity.The performance of the proposed approach is evaluated through simulation experiments. It is compared against two state-of-the-art algorithms and has been shown to outperform both in terms of improved coverage, more stable connectivity, and lower energy consumption.

Study on Progressive Damage Assessment and Scarf Repair of Composite Honeycomb Structure

As the widely application of composite honeycomb structure in aircraft Structural Significant Items(SSI) and other structures, the damage assessment and repair scheme because of the impact and other damages have become one of the most concerned issues in the civil aircraft composite structures. In view of the progressive damage assessment of composite honeycomb structure and it's adhesively scarf repair parameter influence, the finite element model based on honeycomb core equivalent model and 3D solid units C3D8 and zero thickness cohesive force unit COH3D8 is established. A special USDFLD program is developed with FORTRAN for ABAQUAS using 3D Hashin criterion Besant criterion and B-K criterion to realize the damage simulation of composite panels, honeycomb cores and adhesive. The relationships between the structural strength recovery rate and the repair parameters such as patch oblique angle, extra layers layup angle and extra layers thickness are studied for the perforation injured honeycomb structure. The results show that the decrease in the patch oblique angle leading to an increase in the internal shear stress of the adhesive, the increase in the angle between the extra layers of the patch and the external load, and the increase in the thickness of the extra layers causing stress concentration and premature instability at the lap edge, will significantly reduce the strength recovery rate of the repaired honeycomb structure. The perfect patch form with 1:10 cut oblique angle and only one extra layer of 0° layup angle is concluded, which achieves the optimal strength recovery effectiveness, reaching 95.72% of the non-damaged honeycomb structure.

Experimental Testing and Strut-and-Tie Modeling of Full-Scale Precast Concrete Girders with FRP Repaired End Regions

Bridges located in cold regions are susceptible to extreme deterioration due to harsh climate conditions. Distressing of girder’s end regions is among the most common damage types in these bridges. This work focuses on addressing this type of damage through the use of a fiber reinforced polymer (FRP) repair scheme. Three-point-bending tests are conducted on the control, damaged, mortar repair and carbon fiber reinforced polymer (CFRP) repair cases of bridge girders that are taken out of service. Test results are analyzed to investigate the effectiveness of FRP to repair precast concrete (PC) girders with damaged end regions. Furthermore, since the damage is mainly localized at girder’s end region where beam theory is invalid, the behavior of FRP repaired end region (D-region) is studied using the strut-and-tie method. Based on the test results, a strut-and-tie model (STM) is proposed to estimate the shear capacity of the girder with the FRP repaired end region. The outcome of the experimental work shows that the FRP laminate repair system is effective in recovering and improving the shear behavior of the girder including both peak force and ductility. The proposed STM can be used to predict the shear capacity of the PC girder with a similar damage pattern to the one considered in this study.

Remediation of Anthracene-Contaminated Soil with Sophorolipids-SDBS-Na2SiO3 and Treatment of Eluting Wastewater

The soil pollution of polycyclic aromatic hydrocarbons (PAHs) is serious in China, which not only affects the living and growing environment of plants and animals but also has a great impact on people’s health. The use of hydrophobic organic compounds to make use of surfactant ectopic elution processing is more convenient and cheaper as a repair scheme and can effectively wash out the polycyclic aromatic hydrocarbons in the soil. Therefore, we mixed sophorolipids:sodium dodecylbenzene sulfonate (SDBS):Na2SiO3 according to the mass ratio of 1:15:150. We explored the influencing factors of high and low concentrations of PAH-contaminated soil using a single factor test and four factors at a two-level factorial design. Then, the elution wastewater was treated by ultrasonic oxidation technology and the alkali-activated sodium persulfate technology. The results showed that: (1) In the single factor test, when the elution time is 8 h, the concentration of the compounded surfactant is 1200 mg/L, the particle size is 60 mesh, the concentration of NaCl is 100 mmol/L, and the concentration of KCl is 50 mmol/L, and the effect of the PAH-contaminated soil eluted by the composite surfactant is the best. Externally added NaCl and KCl salt ions have a more obvious promotion effect on the polycyclic aromatic hydrocarbon-contaminated soil; (2) in the interaction experiment, single factor B (elution time) and D (NaCl concentration) have a significant main effect. There is also a certain interaction between factor A (concentration agent concentration) and factor D, factor B, and factor C (KCl concentration); (3) the treatment of anthracene in the eluate by ultrasonic completely mineralizes the organic pollutants by the thermal and chemical effects produced by the ultrasonic cavitation phenomenon, so that the organic pollutants in the eluate are oxidized and degraded into simple environmentally friendly small molecular substances. When the optimal ultrasonic time is 60 min and the ratio of oxidant to activator is 1:2, the removal rate of contaminants in the eluent can reach 63.7%. At the same time, the turbidity of the eluent is significantly lower than that of the liquid after centrifugal separation, indicating that oxidants can not only remove the pollutants in elution water but also remove the residual soil particulate matter; and (4) by comparing the infrared spectrum of the eluted waste liquid before and after oxidation, it can be seen that during the oxidation process, the inner part of eluent waste liquid underwent a ring-opening reaction, and the ring-opening reaction also occurred in the part of the cyclic ester group of the surfactant, which changed from a ring to non-ring.

81‐4: Array Defect Detection and Repair Based on Deep Learning

Defect detection is a common task in industry production, array defect is an undesirable phenomenon in array substrate production process due to the environment, production conditions and so on. Array defect detection is very important for the quality performance of final product. Compared with other defects, array defects have a more complex background, make the detection logic is more advanced and difficult to judge. In this paper, we propose a convolution neural network (CNN) for array defect detection based on Faster‐RCNN architecture. On the basis of VGG16 network, we add cross‐connection layer in feature extracted layer to improve the accuracy of small‐size defect detection. On the other hand, we use ROIAlign layer instead of ROI pooling layer to offset the position migration caused by downsampling. The experimental results show that our strategies have a good performance in array defect detection. The precious of defect recognition is more than 95%, and the recall rate is more than 86%, while the defects are divided into 10 categories and the marking image is about 1400 for each type of defect. At the same time, a defect repair scheme based on generating adversarial network (GAN) were proposed: a) input an array defect image and GAN can be used to generate the image without defect or after defect repair, b) the defect repair template can be obtained by compare the generated result with original image, c) this defect repair template can provide reference for practical repair of array defect. In addition, the GAN can be used to optimize array repair scheme and even take the place of manual array defect repair in the future, which can promote the intelligent repair of array defect.

Application of UAV in Road Safety in Intelligent Areas

With the continuous development of remote sensing(RS) technology, the surface information can be collected conveniently and quickly by using the popular unmanned aerial vehicle(UAV). The application of UAV low altitude RS technology in road safety in intelligent area has certain practical significance. It can provide safety warning for most drivers, and provide auxiliary decision-making for the road supervision department. Through the collection, processing, calculation and analysis of the road image, the UAV can find out the road obstacles with potential safety hazards, identify the road pit, calculate the radius and depth of the road pit through the digital mapping system, predict the accident risk according to different speed and provide scientific basis for the road safety monitoring. At the same time, UAV can provide repair scheme for damaged roads, estimate the quantity of materials needed for repair, and achieve the target of resource saving and efficiency improvement. The experimental results show that the UAV can not only provide scientific prediction information for driving safety, but also provide relatively accurate material consump tion for road repair.

A 5D simulation method on post-earthquake repair process of buildings based on BIM

The post-earthquake repair process of buildings is one of the key components of building seismic resilience. Understanding the details of the repair process in advance will benefit the evaluation and decision making for the seismic resilience of buildings. To this end, a five-dimensional (5D) simulation method on the post-earthquake repair process of buildings is proposed based on building information modeling (BIM), by which the repair activities can be presented in the way associated with a 3D model, time (denoted as the fourth dimension), and the related costs (denoted as the fifth dimension). First, a decision-making model of repair schemes based on the interval index of the possibility degree is created to determine the optimal post-earthquake repair schemes for a damaged building. Subsequently, an algorithm based on separate flow-repetitive process is designed to automatically make the repair schedule on a BIM platform according to the determined repair schemes. Finally, an algorithm of automatic mapping between the components in BIM and their repair schedules is developed, so that a 5D simulation of a post-earthquake repair process can be implemented. A six-story office building is selected as a case study, and the details of the post-earthquake repair process (e.g., the costs of labor, material and equipment over the repair time) are presented by the proposed 5D simulation method. The outcome of this study can be used to evaluate the seismic resilience of buildings and also to facilitate the decision making for seismically resilient buildings by providing the detailed guidance of the repair process.

Research on Optimizing the Recovery Strategy of a Distribution Network Communication System Under Extreme Disasters

Extreme disasters, such as typhoons, cause great damage to distribution network communication systems, affecting the perception of disaster situations and the repair speed of the distribution networks. To realize the rapid recovery of a distribution network, an optimal recovery strategy of the distribution network communication system is proposed in this paper from the perspectives of predisaster prediction and postdisaster rush repair. First, based on multivariate data, the space-time mesh fusion method is used to predict the fault position of the distribution network communication system, guiding the accurate allocation of emergency repair resources, and the fault position is corrected using man-made statistics after a disaster. Then, combining fiber optics, mobile nets and emergency communication vehicles, rush repair rules for the distribution network communication system after extreme disasters are put forward, and the shortest route search algorithm is used to solve the minimum rush repair time under the rules, which is the optimal rush repair scheme for the distribution network communication system after an extreme disaster. Finally, the proposed strategy is applied to a practical topology, and the results demonstrate that the strategy is reasonable and effective.

Analysis on Damage Detection of Gangue Silo and Structural Reinforcement Design

According to the damage of gangue bunker structure in FengXi coal industry production system in the process of using, through the corresponding instrument detection and data analysis, the reasonable repair and reinforcement design scheme is put forward for the gangue bunker cylinder wall with different degrees of damage such as concrete loosening and falling off, steel bar exposure, corrosion and so on. The research shows that the treatment scheme of adding a whole layer of warehouse wall and connecting it with the foundation and the upper and lower ring beam of the warehouse body can guarantee the strength and rigidity of the warehouse body to the greatest extent and meet the requirements of normal use and safe production of the gangue warehouse. It provides reference for the use and monitoring of other silo structures in coal industry production system.