Fog computing has emerged as an important technology which can improve the performance of computation-intensive and latency-critical communication networks.Nevertheless,the fog computing Internet-of-Things(IoT)systems...Fog computing has emerged as an important technology which can improve the performance of computation-intensive and latency-critical communication networks.Nevertheless,the fog computing Internet-of-Things(IoT)systems are susceptible to malicious eavesdropping attacks during the information transmission,and this issue has not been adequately addressed.In this paper,we propose a physical-layer secure fog computing IoT system model,which is able to improve the physical layer security of fog computing IoT networks against the malicious eavesdropping of multiple eavesdroppers.The secrecy rate of the proposed model is analyzed,and the quantum galaxy–based search algorithm(QGSA)is proposed to solve the hybrid task scheduling and resource management problem of the network.The computational complexity and convergence of the proposed algorithm are analyzed.Simulation results validate the efficiency of the proposed model and reveal the influence of various environmental parameters on fog computing IoT networks.Moreover,the simulation results demonstrate that the proposed hybrid task scheduling and resource management scheme can effectively enhance secrecy performance across different communication scenarios.展开更多
Recently, several novel computing paradigms are proposed, e.g., fog computing and edge computing. In such more decentralized computing paradigms, the location and resource for code execution and data storage of end ap...Recently, several novel computing paradigms are proposed, e.g., fog computing and edge computing. In such more decentralized computing paradigms, the location and resource for code execution and data storage of end applications could also be optionally distributed among different places or machines. In this paper, we position that this situation requires a new transparent and usercentric approach to unify the resource management and code scheduling from the perspective of end users. We elaborate our vision and propose a software-defined code scheduling framework. The proposed framework allows the code execution or data storage of end applications to be adaptively done at appropriate machines under the help of a performance and capacity monitoring facility, intelligently improving application performance for end users. A pilot system and preliminary results show the advantage of the framework and thus the advocated vision for end users.展开更多
With the rapid development of economy and the intensification of market competition, project management involves various aspects of social development. The limitations of traditional project scheduling management meth...With the rapid development of economy and the intensification of market competition, project management involves various aspects of social development. The limitations of traditional project scheduling management methods are becoming more and more obvious. It is extremely urgent to create and apply new management technologies. According to the constraint theory, critical chain method is a method of controlling a project, which can greatly shorten the completion period of the project and reduce the cost of the enterprise. Firstly, the shortcomings of traditional project scheduling management methods are analyzed, and the importance of adopting key chain technology is pointed out. Secondly, the content of the basic chain method is summarized. Finally, the problems existing in the application of critical chain method are analyzed.展开更多
This paper addresses the integrated processes of planning and scheduling of projects using technologies advanced tools as means for managing change in the era of the 4IR.The paper explores the traditional project mana...This paper addresses the integrated processes of planning and scheduling of projects using technologies advanced tools as means for managing change in the era of the 4IR.The paper explores the traditional project management planning and scheduling tools in conjunction with what technology has to offer,to bridge the gap between the traditional project management planning and scheduling tools and what the modern-day business market demands.An analysis of literature covering a wide range of theoretic and empirical studies was performed.The theories underlying various planning and scheduling methods were analysed in relation to the design of projects.A descriptive quantitative secondary data was used as a tool to assess the impact of technology on project planning for scheduling.The analysis of the study’s data was conducted using the principles of cross-tabulation.Inferences were drawn on the significant impact of the use of advanced technological tools on project planning for scheduling in current business time.Organisations can make use of the findings of this study to correctly apply the available advanced technological tools for more efficient schedule management planning to enhance the successful delivery of their projects.Further,this research can be used to provide learning opportunities for new and inexperienced planners and schedulers,and as a basis for further research in this field of knowledge.展开更多
In the process of social and economic development, the civil engineering industry has also invested a lot of funds and material resources. But in the process of civil engineering construction, the construction schedul...In the process of social and economic development, the civil engineering industry has also invested a lot of funds and material resources. But in the process of civil engineering construction, the construction schedule and quality management are relatively complex, which also brings pressure to the management personnel. At the same time, with the change of the overall construction market, it also puts forward higher requirements for civil engineering construction progress and quality management. Therefore, in the process of civil engineering construction, safety problems should be avoided and progress and quality management should be strengthened. At the same time, managers should realize the importance of their own work and optimize and innovate the deficiencies in progress and quality management, so as to improve the effect of civil engineering construction progress and quality management and promote the development of civil engineering industry.展开更多
With the rapid development of the construction industry, more and more cities begin to carry out construction projects, and the requirements on level and quality are also gradually improving. In construction project m...With the rapid development of the construction industry, more and more cities begin to carry out construction projects, and the requirements on level and quality are also gradually improving. In construction project management, construction progress and quality control are very important links, which play a very important role in improving the management level and quality of construction projects and further developing construction projects. In this regard, this document briefly analyses and discusses measures to manage and monitor the progress of construction projects with a view to assisting relevant staff.展开更多
In order to fundamentally ensure that the construction project can be carried out orderly according to the construction plan, it is necessary to strengthen the supervision of the construction link from many aspects an...In order to fundamentally ensure that the construction project can be carried out orderly according to the construction plan, it is necessary to strengthen the supervision of the construction link from many aspects and dimensions. In order to improve the progress and quality of the overall civil construction project, it is particularly important to analyze the application points of progress management and explore scientific and effective management strategies.展开更多
At present, China's economy is developing rapidly, and the demand for power resources in all walks of life is increasing. In power infrastructure projects, we should fully realize the importance of schedule manage...At present, China's economy is developing rapidly, and the demand for power resources in all walks of life is increasing. In power infrastructure projects, we should fully realize the importance of schedule management. This paper analyzes the progress management in power infrastructure projects.展开更多
As a flexible resource,energy storage plays an increasingly significant role in stabilizing and supporting the power system,while providing auxiliary services.Still,the current high demand for energy storage contrasts...As a flexible resource,energy storage plays an increasingly significant role in stabilizing and supporting the power system,while providing auxiliary services.Still,the current high demand for energy storage contrasts with the fuzzy lack of market-oriented mechanisms for energy storage,the principle of market-oriented operation has not been embodied,and there is no unified and systematic analytical framework for the business model.However,the dispatch management model of energy storage in actual power system operation is not clear.Still,the specific scheduling process and energy storage strategy on the source-load-network side could be more specific,and there needs to be a greater understanding of the collaborative scheduling process of the multilevel scheduling center.On this basis,this paper reviews the energy storage operation model and market-based incentive mechanism,For different functional types and installation locations of energy storage within the power system,the operational models and existing policies for energy storage participation in the market that are adapted to multiple operating states are summarized.From the point of view of the actual scheduling and operation management of energy storage in China,an energy storage regulation and operation management model based on“national,provincial,and local”multilevel coordination is proposed,as well as key technologies in the interactive scenarios of source-load,network and storage.展开更多
Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply c...Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply chain, decrease of resources waste, objective control and so forth. Referring to the characteristics of schedule planning of construction projects and lean construction philosophy, we proposed optimizing methodology of real-time and dynamic schedule of construction projects based on lean construction. The basis of the methodology is process reorganization and lean supply in construction enterprises. The traditional estimating method of the activity duration is fuzzy and random;however, a newly proposed lean forecasting method employs multi-components linear-regression, back-propagation artificial neural networks and learning curve. Taking account of the limited resources and the fixed duration of a project, the optimizing method of the real-time and dynamic schedule adopts the concept of resource driving. To optimize the schedule of a construction project timely and effectively, an intellectualized schedule management system was developed. It can work out the initial schedule, optimize the real-time and dynamic schedule, and display the schedule with the Gant Chart, the net-work graph and the space-time line chart. A case study was also presented to explain the proposed method.展开更多
This article considers threats to a project slipping on budget,schedule and fit-for-purpose.Threat is used here as the collective for risks（quantifiable bad things that can happen）and uncertainties（poorly or not qu...This article considers threats to a project slipping on budget,schedule and fit-for-purpose.Threat is used here as the collective for risks（quantifiable bad things that can happen）and uncertainties（poorly or not quantifiable bad possible events）.Based on experience with projects in developing countries this review considers that（a）project slippage is due to uncertainties rather than risks,（b）while eventuation of some bad things is beyond control,managed execution and oversight are stil the primary means to keeping within budget,on time and fit-for-purpose,（c）improving project delivery is less about bigger and more complex and more about coordinated focus,effectiveness and developing thought-out heuristics,and（d）projects take longer and cost more partly because threat identification is inaccurate,the scope of identified threats is too narrow,and the threat assessment product is not integrated into overall project decision-making and execution.Almost by definition,what is poorly known is likely to cause problems.Yet it is not just the unquantifiability and intangibility of uncertainties causing project slippage,but that they are insufficiently taken into account in project planning and execution that cause budget and time overruns.Improving project performance requires purpose-driven and managed deployment of scarce seasoned professionals.This can be aided with independent oversight by deeply experienced panelists who contribute technical insights and can potentially show that diligence is seen to be done.展开更多
The purpose of Engineering Procurement Construction(EPC)general contracting project schedule management is to ensure that the project meets its deadlines,and it plays a critical role in contract performance.In compari...The purpose of Engineering Procurement Construction(EPC)general contracting project schedule management is to ensure that the project meets its deadlines,and it plays a critical role in contract performance.In comparison to the domestic general contracting model,project management and coordination are more complex for the general contractor of international EPC projects.As a result,scientific project schedule process control is critical to effectively ensuring project duration,saving project costs,improving project management level,and project quality,and ensuring that the project achieves the promised advantages for both the contractor and the owner.Through the research and analysis of the status of the schedule management of the Indonesia B Project Phase II cement project,corresponding optimization measures are proposed for the project schedule process control.展开更多
基金supported by the National Natural Science Foundation of China(61571149,62001139)the Initiation Fund for Postdoctoral Research in Heilongjiang Province(LBH-Q19098)the Natural Science Foundation of Heilongjiang Province(LH2020F0178).
文摘Fog computing has emerged as an important technology which can improve the performance of computation-intensive and latency-critical communication networks.Nevertheless,the fog computing Internet-of-Things(IoT)systems are susceptible to malicious eavesdropping attacks during the information transmission,and this issue has not been adequately addressed.In this paper,we propose a physical-layer secure fog computing IoT system model,which is able to improve the physical layer security of fog computing IoT networks against the malicious eavesdropping of multiple eavesdroppers.The secrecy rate of the proposed model is analyzed,and the quantum galaxy–based search algorithm(QGSA)is proposed to solve the hybrid task scheduling and resource management problem of the network.The computational complexity and convergence of the proposed algorithm are analyzed.Simulation results validate the efficiency of the proposed model and reveal the influence of various environmental parameters on fog computing IoT networks.Moreover,the simulation results demonstrate that the proposed hybrid task scheduling and resource management scheme can effectively enhance secrecy performance across different communication scenarios.
基金supported in part by Initiative Scientific Research Program in Tsinghua University under Grant No.20161080066in part by International Science&Technology Cooperation Program of China under Grant No.2013DFB10070
文摘Recently, several novel computing paradigms are proposed, e.g., fog computing and edge computing. In such more decentralized computing paradigms, the location and resource for code execution and data storage of end applications could also be optionally distributed among different places or machines. In this paper, we position that this situation requires a new transparent and usercentric approach to unify the resource management and code scheduling from the perspective of end users. We elaborate our vision and propose a software-defined code scheduling framework. The proposed framework allows the code execution or data storage of end applications to be adaptively done at appropriate machines under the help of a performance and capacity monitoring facility, intelligently improving application performance for end users. A pilot system and preliminary results show the advantage of the framework and thus the advocated vision for end users.
文摘With the rapid development of economy and the intensification of market competition, project management involves various aspects of social development. The limitations of traditional project scheduling management methods are becoming more and more obvious. It is extremely urgent to create and apply new management technologies. According to the constraint theory, critical chain method is a method of controlling a project, which can greatly shorten the completion period of the project and reduce the cost of the enterprise. Firstly, the shortcomings of traditional project scheduling management methods are analyzed, and the importance of adopting key chain technology is pointed out. Secondly, the content of the basic chain method is summarized. Finally, the problems existing in the application of critical chain method are analyzed.
文摘This paper addresses the integrated processes of planning and scheduling of projects using technologies advanced tools as means for managing change in the era of the 4IR.The paper explores the traditional project management planning and scheduling tools in conjunction with what technology has to offer,to bridge the gap between the traditional project management planning and scheduling tools and what the modern-day business market demands.An analysis of literature covering a wide range of theoretic and empirical studies was performed.The theories underlying various planning and scheduling methods were analysed in relation to the design of projects.A descriptive quantitative secondary data was used as a tool to assess the impact of technology on project planning for scheduling.The analysis of the study’s data was conducted using the principles of cross-tabulation.Inferences were drawn on the significant impact of the use of advanced technological tools on project planning for scheduling in current business time.Organisations can make use of the findings of this study to correctly apply the available advanced technological tools for more efficient schedule management planning to enhance the successful delivery of their projects.Further,this research can be used to provide learning opportunities for new and inexperienced planners and schedulers,and as a basis for further research in this field of knowledge.
文摘In the process of social and economic development, the civil engineering industry has also invested a lot of funds and material resources. But in the process of civil engineering construction, the construction schedule and quality management are relatively complex, which also brings pressure to the management personnel. At the same time, with the change of the overall construction market, it also puts forward higher requirements for civil engineering construction progress and quality management. Therefore, in the process of civil engineering construction, safety problems should be avoided and progress and quality management should be strengthened. At the same time, managers should realize the importance of their own work and optimize and innovate the deficiencies in progress and quality management, so as to improve the effect of civil engineering construction progress and quality management and promote the development of civil engineering industry.
文摘With the rapid development of the construction industry, more and more cities begin to carry out construction projects, and the requirements on level and quality are also gradually improving. In construction project management, construction progress and quality control are very important links, which play a very important role in improving the management level and quality of construction projects and further developing construction projects. In this regard, this document briefly analyses and discusses measures to manage and monitor the progress of construction projects with a view to assisting relevant staff.
文摘In order to fundamentally ensure that the construction project can be carried out orderly according to the construction plan, it is necessary to strengthen the supervision of the construction link from many aspects and dimensions. In order to improve the progress and quality of the overall civil construction project, it is particularly important to analyze the application points of progress management and explore scientific and effective management strategies.
文摘At present, China's economy is developing rapidly, and the demand for power resources in all walks of life is increasing. In power infrastructure projects, we should fully realize the importance of schedule management. This paper analyzes the progress management in power infrastructure projects.
基金the North China Branch of State Grid Corporation of China,Contract No.SGNC0000BGWT2310175.
文摘As a flexible resource,energy storage plays an increasingly significant role in stabilizing and supporting the power system,while providing auxiliary services.Still,the current high demand for energy storage contrasts with the fuzzy lack of market-oriented mechanisms for energy storage,the principle of market-oriented operation has not been embodied,and there is no unified and systematic analytical framework for the business model.However,the dispatch management model of energy storage in actual power system operation is not clear.Still,the specific scheduling process and energy storage strategy on the source-load-network side could be more specific,and there needs to be a greater understanding of the collaborative scheduling process of the multilevel scheduling center.On this basis,this paper reviews the energy storage operation model and market-based incentive mechanism,For different functional types and installation locations of energy storage within the power system,the operational models and existing policies for energy storage participation in the market that are adapted to multiple operating states are summarized.From the point of view of the actual scheduling and operation management of energy storage in China,an energy storage regulation and operation management model based on“national,provincial,and local”multilevel coordination is proposed,as well as key technologies in the interactive scenarios of source-load,network and storage.
文摘Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply chain, decrease of resources waste, objective control and so forth. Referring to the characteristics of schedule planning of construction projects and lean construction philosophy, we proposed optimizing methodology of real-time and dynamic schedule of construction projects based on lean construction. The basis of the methodology is process reorganization and lean supply in construction enterprises. The traditional estimating method of the activity duration is fuzzy and random;however, a newly proposed lean forecasting method employs multi-components linear-regression, back-propagation artificial neural networks and learning curve. Taking account of the limited resources and the fixed duration of a project, the optimizing method of the real-time and dynamic schedule adopts the concept of resource driving. To optimize the schedule of a construction project timely and effectively, an intellectualized schedule management system was developed. It can work out the initial schedule, optimize the real-time and dynamic schedule, and display the schedule with the Gant Chart, the net-work graph and the space-time line chart. A case study was also presented to explain the proposed method.
文摘This article considers threats to a project slipping on budget,schedule and fit-for-purpose.Threat is used here as the collective for risks（quantifiable bad things that can happen）and uncertainties（poorly or not quantifiable bad possible events）.Based on experience with projects in developing countries this review considers that（a）project slippage is due to uncertainties rather than risks,（b）while eventuation of some bad things is beyond control,managed execution and oversight are stil the primary means to keeping within budget,on time and fit-for-purpose,（c）improving project delivery is less about bigger and more complex and more about coordinated focus,effectiveness and developing thought-out heuristics,and（d）projects take longer and cost more partly because threat identification is inaccurate,the scope of identified threats is too narrow,and the threat assessment product is not integrated into overall project decision-making and execution.Almost by definition,what is poorly known is likely to cause problems.Yet it is not just the unquantifiability and intangibility of uncertainties causing project slippage,but that they are insufficiently taken into account in project planning and execution that cause budget and time overruns.Improving project performance requires purpose-driven and managed deployment of scarce seasoned professionals.This can be aided with independent oversight by deeply experienced panelists who contribute technical insights and can potentially show that diligence is seen to be done.
文摘The purpose of Engineering Procurement Construction(EPC)general contracting project schedule management is to ensure that the project meets its deadlines,and it plays a critical role in contract performance.In comparison to the domestic general contracting model,project management and coordination are more complex for the general contractor of international EPC projects.As a result,scientific project schedule process control is critical to effectively ensuring project duration,saving project costs,improving project management level,and project quality,and ensuring that the project achieves the promised advantages for both the contractor and the owner.Through the research and analysis of the status of the schedule management of the Indonesia B Project Phase II cement project,corresponding optimization measures are proposed for the project schedule process control.
