BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on ...BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on the traditional Chinese medicine theory of“Yin tumor”,we believe that“Yang does not transform Yin,and it is blocked in the intestines”is the core pathogenesis of mCRC.Based on the basic treatment principle of“warming Yang and dredging intestines”,we developed the Quxie Capsule.Previous randomized controlled clinical trials demonstrated that the Quxie Capsule can significantly prolong the overall survival of patients with mCRC,but it remains to be verified whether the combination of the“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong the efficacy and safety of the mCRC during the period of maintenance therapy.AIM To confirm and clinically validate that the combination of“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong progression-free survival(PFS)during maintenance treatment of mCRC.The safety of“warming Yang and dredging intestines method”prescription is also assessed.METHODS The study has a prospective,open-label,randomized,controlled study design.Patients have been recruited beginning November 2023 from Xiyuan Hospital of China Academy of Chinese Medical Sciences,Guang’anmen Hospital of China Academy of Chinese Medical Sciences,Dongfang Hospital of Beijing University of Chinese Medicine,and Xinjiang Uygur Autonomous Region Hospital of Traditional Chinese Medicine.The study period is from March 2024 to March 2026.After screening in outpatient clinics or wards,subjects who met the inclusion criteria are randomized into the treatment or control group in a 2:1 ratio.The treatment group receives the“warming Yang and dredging intestines method”formula combined with Western standard maintenance therapy.The control group receives Western standard maintenance therapy formulated by the investigators based on the Chinese Society of Clinical Oncology guidelines for colorectal cancer.All participants receive treatment until the occurrence of disease progression,death,or unmanageable adverse effects,with post-treatment monitoring continued until mortality.An independent panel of chief physicians with extensive clinical experience evaluates the progression of the disease.RESULTS This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.The goal is to provide a combined Chinese and Western medicine treatment option for clinical physicians and mCRC patients.Notably,with the actual sample size,this study has an 80%probability of detecting a significant difference if a true difference exists.Small sample sizes may lead to increased instability of the results of subgroup analyses,and may also result in findings that are only applicable to patients with characteristics highly similar to those of the present study population(e.g.,specific genotypes,therapeutic backgrounds,etc.),making it difficult to generalize to the broader mCRC population.In the future,it may be possible to expand the sample size based on this study to further validate the efficacy and safety of combining Chinese and Western medicine in the treatment of mCRC.Basic research on the therapeutic combination of warming Yang and dredging intestines method formula and standard Western regimen will be performed in parallel.CONCLUSION This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.展开更多
According to military requirement, and based on the problems of equipmentmaintenance support methods in high-tech battles, each element supporting equipment maintenance isanalyzed, and the methods for improving equipm...According to military requirement, and based on the problems of equipmentmaintenance support methods in high-tech battles, each element supporting equipment maintenance isanalyzed, and the methods for improving equipment maintenance are proposed.展开更多
With the continuous development of peoples life, the requirements for the quality of life are getting better and better, especially for the living environment and green development. In order to protect the environment...With the continuous development of peoples life, the requirements for the quality of life are getting better and better, especially for the living environment and green development. In order to protect the environment and take the path of green development, it is necessary to change the source of energy. Hydropower is favored by people with its advantages of environmental protection. The wide application of hydropower also promotes the increasing number of hydropower stations. The number of hydropower stations in China is large, but the service time of hydropower stations is relatively short, and there are still some problems in many aspects. Governor is an indispensable device for hydropower generation, which plays an irreplaceable role in hydropower generation. Once there is a problem with the governor of hydropower station, it will affect the whole power station. In order to reduce the impact of the governor failure of hydropower station, we must analyze the common faults of the governor of hydropower station, and prepare the corresponding maintenance plan for these common faults, which can be repaired quickly in case of failure, so as to minimize the impact on the hydropower station as far as possible. This paper briefly analyzes the common faults and maintenance methods of the governor of hydropower station.展开更多
The implementation of artificial intelligence(AI)in a smart society,in which the analysis of human habits is mandatory,requires automated data scheduling and analysis using smart applications,a smart infrastructure,sm...The implementation of artificial intelligence(AI)in a smart society,in which the analysis of human habits is mandatory,requires automated data scheduling and analysis using smart applications,a smart infrastructure,smart systems,and a smart network.In this context,which is characterized by a large gap between training and operative processes,a dedicated method is required to manage and extract the massive amount of data and the related information mining.The method presented in this work aims to reduce this gap with near-zero-failure advanced diagnostics(AD)for smart management,which is exploitable in any context of Society 5.0,thus reducing the risk factors at all management levels and ensuring quality and sustainability.We have also developed innovative applications for a humancentered management system to support scheduling in the maintenance of operative processes,for reducing training costs,for improving production yield,and for creating a human–machine cyberspace for smart infrastructure design.The results obtained in 12 international companies demonstrate a possible global standardization of operative processes,leading to the design of a near-zero-failure intelligent system that is able to learn and upgrade itself.Our new method provides guidance for selecting the new generation of intelligent manufacturing and smart systems in order to optimize human–machine interactions,with the related smart maintenance and education.展开更多
The determination of maintenance mode of complex equipment in nuclear power plant is an essential work for reliability analysis and maintenance decision. Currently, the main decision method of maintenance mode is reli...The determination of maintenance mode of complex equipment in nuclear power plant is an essential work for reliability analysis and maintenance decision. Currently, the main decision method of maintenance mode is reliability centered maintenance( RCM) logic decision-making process, but the process is a qualitative analysis process. Based on a comprehensive analysis of factors affecting equipment reliability and maintenance work, it adopts a fuzzy synthesis decision method to establish a maintenance decision model,which uses the maximum subordination principle and expert assessment method to determine the maintenance mode of complex equipment. Combined with a concrete example of generators in nuclear power plant,a description of maintenance decision method was proposed in the application of complex equipment. The research shows that the method is feasible and reliable.展开更多
The purpose of this paper is to implement and validate a decision making framework for building maintenance projects. The growing importance of maintenance sector not only in Malaysia but al- so increasingly globalize...The purpose of this paper is to implement and validate a decision making framework for building maintenance projects. The growing importance of maintenance sector not only in Malaysia but al- so increasingly globalized, the difficulty in selecting an appropriate procurement method and lack of research in this area provide an impetus for this research. There were 19 procurement selection criteria identified. In addition, there were 4 types of procurements methods which include outsourcing by specialist term contract, outsourcing by tendered schedule term contract, out- sourcing by repair and maintenance contract and outsourcing by measured term contract identified to be the most popular procurement methods adapted by public universities currently and at the same time were considered most important. The decision making framework was developed based on AHP technique and principles. Expert Choice Software was employed as development tool where the criteria and alternatives were integrated into the framework. Finally, structured interview was conducted to validate the framework developed. The validation process was carried out through structured interview with selected public university.展开更多
Maintenance decision problems generally involve multiple criteria which apparently are best addressed using Multi-Criteria Decision Making (MCDM) tools. This paper describes the use of a hybrid MCDM technique in prior...Maintenance decision problems generally involve multiple criteria which apparently are best addressed using Multi-Criteria Decision Making (MCDM) tools. This paper describes the use of a hybrid MCDM technique in prioritizing maintenance strategy for ship systems. The Hybrid MCDM technique combines Delphi method, AHP and TOPSIS methods. While the Delphi method and AHP are applied in screening of decision criteria and decision criteria weights determination respectively, the TOPSIS method is used in the ranking of alternative maintenance strategies. Five alternative maintenance strategies which include corrected maintenance, scheduled overhaul, scheduled replacement, continuous on-condition task and scheduled on-condition task are considered and the optimum maintenance strategy is selected based on twelve critical maintenance decision criteria. To demonstrate the suitability of the approach a case study of sea water pump of the central cooling system of a marine diesel engine is used.展开更多
In recent years, under the conditions of market economy, project investment has gradually developed in the direction of diversification and highway construction is no exception, forming an operation mode to promote pr...In recent years, under the conditions of market economy, project investment has gradually developed in the direction of diversification and highway construction is no exception, forming an operation mode to promote project construction and management through project legal persons. The tasks of the project legal entity are very important. On the one hand, it should supervise the construction of construction projects. On the other hand, it is also necessary to deal with the problems existing in the actual operation of construction projects. To this end, this paper will establish and improve the project management mechanism, formulate the overall plan of the whole life cycle of the project, supervise the project quality, control the key points, publicize the innovative achievements, build information management and promote the formation and development of the integrated management mode of construction management and maintenance. Here, the author conducted a detailed investigation and study on the road of a highway section in Jiangsu province;according to the technical status and disease causes of bridges, tunnels, facilities along the line, testing and maintenance equipment, etc., six issues were discussed including technical durability, structural safety, engineering coordination, maintenance convenience, operation safety and efficient management. According to the characteristics of highway engineering and according to the construction needs of different professions, an integrated countermeasure library of construction, management, maintenance and transportation has been established with six functional requirements of technical durability, structural safety, engineering coordination, maintenance convenience, operation safety and efficient management. According to the multi-level evaluation method, according to the needs of engineering construction and the characteristics of the region, the comprehensive analysis of the scheme was carried out and a comprehensive plan was given.展开更多
With the rapid development of China's social economy, many real industries continue to update modern equipment, which requires more professional, with practical ability of talent, therefore, the vocational educati...With the rapid development of China's social economy, many real industries continue to update modern equipment, which requires more professional, with practical ability of talent, therefore, the vocational education has put forward new requirements, more attention to cultivate students' practical ability, in order to quickly adapt to the future occupation demand. At present, project-based teaching method has been widely used in all kinds of vocational teaching and achieved certain teaching effects. This paper will discuss the project-based teaching method and analyze its application value in the training of maintenance fitters' professional skills for reference.展开更多
The vast potential of system health monitoring and condition based maintenance on modern commercial aircraft is being realized through the innovative use of Airplane Condition Monitoring System(ACMS) data.However ther...The vast potential of system health monitoring and condition based maintenance on modern commercial aircraft is being realized through the innovative use of Airplane Condition Monitoring System(ACMS) data.However there are few methods addressing the issues of failure prognostics and predictive maintenance for commercial aircraft Air Conditioning System(ACS).This study developed a Bayesian failure prognostics approach using ACMS data for predictive maintenance of ACS.First, a health index characterizing the ACS health state is inferred from a multiple sensor signals using a data driven method.Then a dynamic linear model is proposed to describe the degradation process for failure prognostics.Bayesian inference formulas are carried out for degradation estimation and prediction.The developed approach is applied on a passenger aircraft fleet with ACMS data recorded for one year.The analysis of the case study shows that the developed method can produce satisfactory prognostics results, where all the ACS failure precursors are identified in advance, and the relative errors for the failure time prediction made when just entering the degradation warning stage are less than 8%.This would allow operators to proactively plan future maintenance.展开更多
A new multi-level analysis method of introducing the super-element modeling method, derived from the multi-level analysis method first proposed by O. F. Hughes, has been proposed in this paper to solve the problem of ...A new multi-level analysis method of introducing the super-element modeling method, derived from the multi-level analysis method first proposed by O. F. Hughes, has been proposed in this paper to solve the problem of high time cost in adopting a rational-based optimal design method for ship structural design. Furthermore,the method was verified by its effective application in optimization of the mid-ship section of a container ship. A full 3-D FEM model of a ship,suffering static and quasi-static loads, was used as the analyzing object for evaluating the structural performance of the mid-ship module, including static strength and buckling performance. Research results reveal that this new method could substantially reduce the computational cost of the rational-based optimization problem without decreasing its accuracy, which increases the feasibility and economic efficiency of using a rational-based optimal design method in ship structural design.展开更多
Airframe maintenance is traditionally performed at scheduled maintenance stops.The decision to repair a fuselage panel is based on a fixed crack size threshold,which allows to ensure the aircraft safety until the next...Airframe maintenance is traditionally performed at scheduled maintenance stops.The decision to repair a fuselage panel is based on a fixed crack size threshold,which allows to ensure the aircraft safety until the next scheduled maintenance stop.With progress in sensor technology and data processing techniques,structural health monitoring（SHM） systems are increasingly being considered in the aviation industry.SHM systems track the aircraft health state continuously,leading to the possibility of planning maintenance based on an actual state of aircraft rather than on a fixed schedule.This paper builds upon a model-based prognostics framework that the authors developed in their previous work,which couples the Extended Kalman filter（EKF） with a firstorder perturbation（FOP） method.By using the information given by this prognostics method,a novel cost driven predictive maintenance（CDPM） policy is proposed,which ensures the aircraft safety while minimizing the maintenance cost.The proposed policy is formally derived based on the trade-off between probabilities of occurrence of scheduled and unscheduled maintenance.A numerical case study simulating the maintenance process of an entire fleet of aircrafts is implemented.Under the condition of assuring the same safety level,the CDPM is compared in terms of cost with two other maintenance policies：scheduled maintenance and threshold based SHM maintenance.The comparison results show CDPM could lead to significant cost savings.展开更多
This paper is on the suggestion of maintenance items for electric railway facility systems.With the recent increase in the use of electric locomotives,the utilization and importance of railroad electrical facility sys...This paper is on the suggestion of maintenance items for electric railway facility systems.With the recent increase in the use of electric locomotives,the utilization and importance of railroad electrical facility systems are also increasing,but the railroad electrical facility system in Korea is rapidly aging.To solve this problem,various methodologies are applied to ensure operational reliability and stability for railroad electrical facility systems,but there is a lack of detailed evaluation criteria for railroad electrical facility system maintenance.Also,maintenance items must be selected in a scientific and systematic method.Therefore,railroad electrical facility systems are selected for study.Design StructureMatrix(DSM)is utilized to establish considerations tailored to the maintenance characteristics,and the Fuzzy-TOPSIS methodology is utilized for determining the maintenance detail evaluation item baseline weights,a multi-criteria decision-making problem.Studies show that degradation,insulation items have the highest weight of 14.63%,and capacity items have the lowest weight of 5.34%.The results of this may be contributed to the underlying research in carrying out maintenance activities to ensure the reliability and safety of railroad electrical facility systems.展开更多
With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration...With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration system is important.The deterioration process of the discussed system is described by a Gamma process.The predictive maintenance is considered to be imperfect and formulated.The expected interval of two continuous preventive maintenances is derived.Then,the maintenance optimization model of the continuously monitored deterioration system is presented.In the model,the minimization of the expected operational cost per unit time and the maximization of the system availability are the optimization objectives.The improved ideal point method with the normalized objective functions is employed to solve the proposed model.The validity and sensitivity of the proposed multiobjective maintenance optimization model are analyzed by a numerical example.展开更多
With the interconnection of power grid, the increase of coupling, the rapid development of new energy, the inter-provincial cross-regional power market transactions, it is an important way that the integrated presenta...With the interconnection of power grid, the increase of coupling, the rapid development of new energy, the inter-provincial cross-regional power market transactions, it is an important way that the integrated presentation of grid outage maintenance plan to ensure the safety of power grid, ensure the normal operation of the market, improve the efficiency of maintenance and reduce the cost of maintenance. Maintenance plan is in the annual, monthly, daily and other dimensions of time rolling management process. Maintenance planning level assessment can improve the service level of maintenance plan compilers and the efficiency of maintenance, it also achieves fine management of the power grid. This paper presents an evaluation model of maintenance business level, which is a comprehensive evaluation model of multi-index. The indexes in the model are based on the maintenance service level measurement, the efficiency of the maintenance plan, the emergencies of the maintenance plan and others Impact factors and other aspects of multi-angle assessment. The validity and correctness of the evaluation system and the comprehensive evaluation method are verified by the analysis of practical examples.展开更多
Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolut...Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.展开更多
In the industrial engineering, the maintenance and logistics support process is one of the key factors for the performance of equipment. Bill of materials( BOM) describes all the components in product and internal hie...In the industrial engineering, the maintenance and logistics support process is one of the key factors for the performance of equipment. Bill of materials( BOM) describes all the components in product and internal hierarchal relationships as a structured tree.In order to gain all required maintenance information for complex equipment which is complex,the modeling and the application of maintenance BOM are introduced in this paper. Because of the simple structure and the wide function,IDEF0 is presented to build the model of maintenance BOM. The modeling approach can gather the maintenance information conveniently based on other BOMs,and applications of maintenance BOM are widely,particularly,in maintenance and inventory management.展开更多
With the continuous development of economy and society and the speeding up development of industrial industry, people's living standards are gradually improving, which leads to the increasing discharge of domestic...With the continuous development of economy and society and the speeding up development of industrial industry, people's living standards are gradually improving, which leads to the increasing discharge of domestic waste and industrial waste, so the working pressure of sewage treatment plants invisibly increases. Sewage treatment plant is the concentration of waste treatment and it will produce a large number of wastes generated by the accumulation of odor, that is, waste gas, with the characteristics of strong diffusion. Therefore, if the wastewater treatment plant can not properly treat these waste gases in time, it is easy to cause large-scale air pollution. If people live in this odor environment for a long time, it will seriously harm their health. Starting from waste gas treatment methods, do multi-level deodorization and purification of waste gas, which is the key measure to effectively help improve people's quality of life.展开更多
Objective: to study and analyze the value of humanistic care model in patients with maintenance hemodialysis.Method: into our hospital from October 2019 to May 2021 to maintenance hemodialysis treatment of 60 patients...Objective: to study and analyze the value of humanistic care model in patients with maintenance hemodialysis.Method: into our hospital from October 2019 to May 2021 to maintenance hemodialysis treatment of 60 patients, random digital table is divided into research group, control group, each 30 cases, implement routine care, research group to carry out humanistic care care mode intervention, the two groups of patients coping way, hope level, nutritional status, nursing satisfaction evaluation comparison.Results: the MCMQ scale and M C M Q scores were lower than the control group, the Herth Hope scale was higher than the control group, albumin, total protein and proalbumin levels, nursing satisfaction was higher than the controls, and the difference was statistically significant (P <0.05).Conclusion: the application of humanistic care model in maintenance hemodialysis patients can improve patient response, improve nutritional status and nursing satisfaction with high application value.展开更多
With the rapid development of the social economy of various countries, under the influence of the economic globalization trend, the trade between other countries is becoming more and more frequent, which makes people ...With the rapid development of the social economy of various countries, under the influence of the economic globalization trend, the trade between other countries is becoming more and more frequent, which makes people communicate more and more close. Then, economic development and cultural exchanges cannot be separated from transportation, which tends to promote consumption to a certain extent and drive economic development. Railway transportation was one of the main transportation as a modern mode of transportation at that time, and its development greatly facilitated people's travel and the transportation of bulk goods. In recent years, the continuous development of the railway transportation industry makes the railway transportation play an increasingly important role in the whole transportation field. However, the huge workload and the long-term braking of the train will cause damage to the railway, in order to ensure people's travel safety and the safe transportation of goods, the maintenance and maintenance of the railway route is particularly important, only the maintenance work, to ensure the safety performance of the railway, prolong its service life.展开更多
基金Supported by the National Natural Science Foundation of China,No.82174461Capacity Enhancement Program of Xiyuan Hospital,China Academy of Traditional Chinese Medicine,No.XYZX0201-22Science and Technology Innovation Project of China Academy of Traditional Chinese Medicine,No.CI2021A01811.
文摘BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on the traditional Chinese medicine theory of“Yin tumor”,we believe that“Yang does not transform Yin,and it is blocked in the intestines”is the core pathogenesis of mCRC.Based on the basic treatment principle of“warming Yang and dredging intestines”,we developed the Quxie Capsule.Previous randomized controlled clinical trials demonstrated that the Quxie Capsule can significantly prolong the overall survival of patients with mCRC,but it remains to be verified whether the combination of the“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong the efficacy and safety of the mCRC during the period of maintenance therapy.AIM To confirm and clinically validate that the combination of“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong progression-free survival(PFS)during maintenance treatment of mCRC.The safety of“warming Yang and dredging intestines method”prescription is also assessed.METHODS The study has a prospective,open-label,randomized,controlled study design.Patients have been recruited beginning November 2023 from Xiyuan Hospital of China Academy of Chinese Medical Sciences,Guang’anmen Hospital of China Academy of Chinese Medical Sciences,Dongfang Hospital of Beijing University of Chinese Medicine,and Xinjiang Uygur Autonomous Region Hospital of Traditional Chinese Medicine.The study period is from March 2024 to March 2026.After screening in outpatient clinics or wards,subjects who met the inclusion criteria are randomized into the treatment or control group in a 2:1 ratio.The treatment group receives the“warming Yang and dredging intestines method”formula combined with Western standard maintenance therapy.The control group receives Western standard maintenance therapy formulated by the investigators based on the Chinese Society of Clinical Oncology guidelines for colorectal cancer.All participants receive treatment until the occurrence of disease progression,death,or unmanageable adverse effects,with post-treatment monitoring continued until mortality.An independent panel of chief physicians with extensive clinical experience evaluates the progression of the disease.RESULTS This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.The goal is to provide a combined Chinese and Western medicine treatment option for clinical physicians and mCRC patients.Notably,with the actual sample size,this study has an 80%probability of detecting a significant difference if a true difference exists.Small sample sizes may lead to increased instability of the results of subgroup analyses,and may also result in findings that are only applicable to patients with characteristics highly similar to those of the present study population(e.g.,specific genotypes,therapeutic backgrounds,etc.),making it difficult to generalize to the broader mCRC population.In the future,it may be possible to expand the sample size based on this study to further validate the efficacy and safety of combining Chinese and Western medicine in the treatment of mCRC.Basic research on the therapeutic combination of warming Yang and dredging intestines method formula and standard Western regimen will be performed in parallel.CONCLUSION This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.
文摘According to military requirement, and based on the problems of equipmentmaintenance support methods in high-tech battles, each element supporting equipment maintenance isanalyzed, and the methods for improving equipment maintenance are proposed.
文摘With the continuous development of peoples life, the requirements for the quality of life are getting better and better, especially for the living environment and green development. In order to protect the environment and take the path of green development, it is necessary to change the source of energy. Hydropower is favored by people with its advantages of environmental protection. The wide application of hydropower also promotes the increasing number of hydropower stations. The number of hydropower stations in China is large, but the service time of hydropower stations is relatively short, and there are still some problems in many aspects. Governor is an indispensable device for hydropower generation, which plays an irreplaceable role in hydropower generation. Once there is a problem with the governor of hydropower station, it will affect the whole power station. In order to reduce the impact of the governor failure of hydropower station, we must analyze the common faults of the governor of hydropower station, and prepare the corresponding maintenance plan for these common faults, which can be repaired quickly in case of failure, so as to minimize the impact on the hydropower station as far as possible. This paper briefly analyzes the common faults and maintenance methods of the governor of hydropower station.
文摘The implementation of artificial intelligence(AI)in a smart society,in which the analysis of human habits is mandatory,requires automated data scheduling and analysis using smart applications,a smart infrastructure,smart systems,and a smart network.In this context,which is characterized by a large gap between training and operative processes,a dedicated method is required to manage and extract the massive amount of data and the related information mining.The method presented in this work aims to reduce this gap with near-zero-failure advanced diagnostics(AD)for smart management,which is exploitable in any context of Society 5.0,thus reducing the risk factors at all management levels and ensuring quality and sustainability.We have also developed innovative applications for a humancentered management system to support scheduling in the maintenance of operative processes,for reducing training costs,for improving production yield,and for creating a human–machine cyberspace for smart infrastructure design.The results obtained in 12 international companies demonstrate a possible global standardization of operative processes,leading to the design of a near-zero-failure intelligent system that is able to learn and upgrade itself.Our new method provides guidance for selecting the new generation of intelligent manufacturing and smart systems in order to optimize human–machine interactions,with the related smart maintenance and education.
文摘The determination of maintenance mode of complex equipment in nuclear power plant is an essential work for reliability analysis and maintenance decision. Currently, the main decision method of maintenance mode is reliability centered maintenance( RCM) logic decision-making process, but the process is a qualitative analysis process. Based on a comprehensive analysis of factors affecting equipment reliability and maintenance work, it adopts a fuzzy synthesis decision method to establish a maintenance decision model,which uses the maximum subordination principle and expert assessment method to determine the maintenance mode of complex equipment. Combined with a concrete example of generators in nuclear power plant,a description of maintenance decision method was proposed in the application of complex equipment. The research shows that the method is feasible and reliable.
文摘The purpose of this paper is to implement and validate a decision making framework for building maintenance projects. The growing importance of maintenance sector not only in Malaysia but al- so increasingly globalized, the difficulty in selecting an appropriate procurement method and lack of research in this area provide an impetus for this research. There were 19 procurement selection criteria identified. In addition, there were 4 types of procurements methods which include outsourcing by specialist term contract, outsourcing by tendered schedule term contract, out- sourcing by repair and maintenance contract and outsourcing by measured term contract identified to be the most popular procurement methods adapted by public universities currently and at the same time were considered most important. The decision making framework was developed based on AHP technique and principles. Expert Choice Software was employed as development tool where the criteria and alternatives were integrated into the framework. Finally, structured interview was conducted to validate the framework developed. The validation process was carried out through structured interview with selected public university.
文摘Maintenance decision problems generally involve multiple criteria which apparently are best addressed using Multi-Criteria Decision Making (MCDM) tools. This paper describes the use of a hybrid MCDM technique in prioritizing maintenance strategy for ship systems. The Hybrid MCDM technique combines Delphi method, AHP and TOPSIS methods. While the Delphi method and AHP are applied in screening of decision criteria and decision criteria weights determination respectively, the TOPSIS method is used in the ranking of alternative maintenance strategies. Five alternative maintenance strategies which include corrected maintenance, scheduled overhaul, scheduled replacement, continuous on-condition task and scheduled on-condition task are considered and the optimum maintenance strategy is selected based on twelve critical maintenance decision criteria. To demonstrate the suitability of the approach a case study of sea water pump of the central cooling system of a marine diesel engine is used.
文摘In recent years, under the conditions of market economy, project investment has gradually developed in the direction of diversification and highway construction is no exception, forming an operation mode to promote project construction and management through project legal persons. The tasks of the project legal entity are very important. On the one hand, it should supervise the construction of construction projects. On the other hand, it is also necessary to deal with the problems existing in the actual operation of construction projects. To this end, this paper will establish and improve the project management mechanism, formulate the overall plan of the whole life cycle of the project, supervise the project quality, control the key points, publicize the innovative achievements, build information management and promote the formation and development of the integrated management mode of construction management and maintenance. Here, the author conducted a detailed investigation and study on the road of a highway section in Jiangsu province;according to the technical status and disease causes of bridges, tunnels, facilities along the line, testing and maintenance equipment, etc., six issues were discussed including technical durability, structural safety, engineering coordination, maintenance convenience, operation safety and efficient management. According to the characteristics of highway engineering and according to the construction needs of different professions, an integrated countermeasure library of construction, management, maintenance and transportation has been established with six functional requirements of technical durability, structural safety, engineering coordination, maintenance convenience, operation safety and efficient management. According to the multi-level evaluation method, according to the needs of engineering construction and the characteristics of the region, the comprehensive analysis of the scheme was carried out and a comprehensive plan was given.
文摘With the rapid development of China's social economy, many real industries continue to update modern equipment, which requires more professional, with practical ability of talent, therefore, the vocational education has put forward new requirements, more attention to cultivate students' practical ability, in order to quickly adapt to the future occupation demand. At present, project-based teaching method has been widely used in all kinds of vocational teaching and achieved certain teaching effects. This paper will discuss the project-based teaching method and analyze its application value in the training of maintenance fitters' professional skills for reference.
基金supported by National Natural Science Foundation of China(91860139)China Postdoctoral Science Foundation(2015M581792)。
文摘The vast potential of system health monitoring and condition based maintenance on modern commercial aircraft is being realized through the innovative use of Airplane Condition Monitoring System(ACMS) data.However there are few methods addressing the issues of failure prognostics and predictive maintenance for commercial aircraft Air Conditioning System(ACS).This study developed a Bayesian failure prognostics approach using ACMS data for predictive maintenance of ACS.First, a health index characterizing the ACS health state is inferred from a multiple sensor signals using a data driven method.Then a dynamic linear model is proposed to describe the degradation process for failure prognostics.Bayesian inference formulas are carried out for degradation estimation and prediction.The developed approach is applied on a passenger aircraft fleet with ACMS data recorded for one year.The analysis of the case study shows that the developed method can produce satisfactory prognostics results, where all the ACS failure precursors are identified in advance, and the relative errors for the failure time prediction made when just entering the degradation warning stage are less than 8%.This would allow operators to proactively plan future maintenance.
基金Supported by the Project of Ministry of Education and Finance(No.200512)the Project of the State Key Laboratory of ocean engineering(GKZD010053-10)
文摘A new multi-level analysis method of introducing the super-element modeling method, derived from the multi-level analysis method first proposed by O. F. Hughes, has been proposed in this paper to solve the problem of high time cost in adopting a rational-based optimal design method for ship structural design. Furthermore,the method was verified by its effective application in optimization of the mid-ship section of a container ship. A full 3-D FEM model of a ship,suffering static and quasi-static loads, was used as the analyzing object for evaluating the structural performance of the mid-ship module, including static strength and buckling performance. Research results reveal that this new method could substantially reduce the computational cost of the rational-based optimization problem without decreasing its accuracy, which increases the feasibility and economic efficiency of using a rational-based optimal design method in ship structural design.
基金supported by UT-INSA Program(2013)the support of the China Scholarship Council(CSC)
文摘Airframe maintenance is traditionally performed at scheduled maintenance stops.The decision to repair a fuselage panel is based on a fixed crack size threshold,which allows to ensure the aircraft safety until the next scheduled maintenance stop.With progress in sensor technology and data processing techniques,structural health monitoring（SHM） systems are increasingly being considered in the aviation industry.SHM systems track the aircraft health state continuously,leading to the possibility of planning maintenance based on an actual state of aircraft rather than on a fixed schedule.This paper builds upon a model-based prognostics framework that the authors developed in their previous work,which couples the Extended Kalman filter（EKF） with a firstorder perturbation（FOP） method.By using the information given by this prognostics method,a novel cost driven predictive maintenance（CDPM） policy is proposed,which ensures the aircraft safety while minimizing the maintenance cost.The proposed policy is formally derived based on the trade-off between probabilities of occurrence of scheduled and unscheduled maintenance.A numerical case study simulating the maintenance process of an entire fleet of aircrafts is implemented.Under the condition of assuring the same safety level,the CDPM is compared in terms of cost with two other maintenance policies：scheduled maintenance and threshold based SHM maintenance.The comparison results show CDPM could lead to significant cost savings.
基金This research was supported by a grant from R&D Program of the Korea Railroad Research Institute,Republic of Korea.
文摘This paper is on the suggestion of maintenance items for electric railway facility systems.With the recent increase in the use of electric locomotives,the utilization and importance of railroad electrical facility systems are also increasing,but the railroad electrical facility system in Korea is rapidly aging.To solve this problem,various methodologies are applied to ensure operational reliability and stability for railroad electrical facility systems,but there is a lack of detailed evaluation criteria for railroad electrical facility system maintenance.Also,maintenance items must be selected in a scientific and systematic method.Therefore,railroad electrical facility systems are selected for study.Design StructureMatrix(DSM)is utilized to establish considerations tailored to the maintenance characteristics,and the Fuzzy-TOPSIS methodology is utilized for determining the maintenance detail evaluation item baseline weights,a multi-criteria decision-making problem.Studies show that degradation,insulation items have the highest weight of 14.63%,and capacity items have the lowest weight of 5.34%.The results of this may be contributed to the underlying research in carrying out maintenance activities to ensure the reliability and safety of railroad electrical facility systems.
基金supported by the Fundamental Research Funds for the Central Universities (N090303005)Key National Science and Technology Special Project (2010ZX04014-014)
文摘With the development of the monitoring technology,it is more and more common that the system is continuously monitored.Therefore,the research on the maintenance optimization of the continuously monitored deterioration system is important.The deterioration process of the discussed system is described by a Gamma process.The predictive maintenance is considered to be imperfect and formulated.The expected interval of two continuous preventive maintenances is derived.Then,the maintenance optimization model of the continuously monitored deterioration system is presented.In the model,the minimization of the expected operational cost per unit time and the maximization of the system availability are the optimization objectives.The improved ideal point method with the normalized objective functions is employed to solve the proposed model.The validity and sensitivity of the proposed multiobjective maintenance optimization model are analyzed by a numerical example.
文摘With the interconnection of power grid, the increase of coupling, the rapid development of new energy, the inter-provincial cross-regional power market transactions, it is an important way that the integrated presentation of grid outage maintenance plan to ensure the safety of power grid, ensure the normal operation of the market, improve the efficiency of maintenance and reduce the cost of maintenance. Maintenance plan is in the annual, monthly, daily and other dimensions of time rolling management process. Maintenance planning level assessment can improve the service level of maintenance plan compilers and the efficiency of maintenance, it also achieves fine management of the power grid. This paper presents an evaluation model of maintenance business level, which is a comprehensive evaluation model of multi-index. The indexes in the model are based on the maintenance service level measurement, the efficiency of the maintenance plan, the emergencies of the maintenance plan and others Impact factors and other aspects of multi-angle assessment. The validity and correctness of the evaluation system and the comprehensive evaluation method are verified by the analysis of practical examples.
文摘Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.
基金National Natural Science Foundation of China(No.71471147)the Basic Research Project of Natural Science in Shaanxi Province of China(No.2015JQ7273)the 111 Project of China(No.B13044)
文摘In the industrial engineering, the maintenance and logistics support process is one of the key factors for the performance of equipment. Bill of materials( BOM) describes all the components in product and internal hierarchal relationships as a structured tree.In order to gain all required maintenance information for complex equipment which is complex,the modeling and the application of maintenance BOM are introduced in this paper. Because of the simple structure and the wide function,IDEF0 is presented to build the model of maintenance BOM. The modeling approach can gather the maintenance information conveniently based on other BOMs,and applications of maintenance BOM are widely,particularly,in maintenance and inventory management.
文摘With the continuous development of economy and society and the speeding up development of industrial industry, people's living standards are gradually improving, which leads to the increasing discharge of domestic waste and industrial waste, so the working pressure of sewage treatment plants invisibly increases. Sewage treatment plant is the concentration of waste treatment and it will produce a large number of wastes generated by the accumulation of odor, that is, waste gas, with the characteristics of strong diffusion. Therefore, if the wastewater treatment plant can not properly treat these waste gases in time, it is easy to cause large-scale air pollution. If people live in this odor environment for a long time, it will seriously harm their health. Starting from waste gas treatment methods, do multi-level deodorization and purification of waste gas, which is the key measure to effectively help improve people's quality of life.
文摘Objective: to study and analyze the value of humanistic care model in patients with maintenance hemodialysis.Method: into our hospital from October 2019 to May 2021 to maintenance hemodialysis treatment of 60 patients, random digital table is divided into research group, control group, each 30 cases, implement routine care, research group to carry out humanistic care care mode intervention, the two groups of patients coping way, hope level, nutritional status, nursing satisfaction evaluation comparison.Results: the MCMQ scale and M C M Q scores were lower than the control group, the Herth Hope scale was higher than the control group, albumin, total protein and proalbumin levels, nursing satisfaction was higher than the controls, and the difference was statistically significant (P <0.05).Conclusion: the application of humanistic care model in maintenance hemodialysis patients can improve patient response, improve nutritional status and nursing satisfaction with high application value.
文摘With the rapid development of the social economy of various countries, under the influence of the economic globalization trend, the trade between other countries is becoming more and more frequent, which makes people communicate more and more close. Then, economic development and cultural exchanges cannot be separated from transportation, which tends to promote consumption to a certain extent and drive economic development. Railway transportation was one of the main transportation as a modern mode of transportation at that time, and its development greatly facilitated people's travel and the transportation of bulk goods. In recent years, the continuous development of the railway transportation industry makes the railway transportation play an increasingly important role in the whole transportation field. However, the huge workload and the long-term braking of the train will cause damage to the railway, in order to ensure people's travel safety and the safe transportation of goods, the maintenance and maintenance of the railway route is particularly important, only the maintenance work, to ensure the safety performance of the railway, prolong its service life.
