Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the...Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the analysis of active queue management （AQM） of DiffServ network, we propose a resource management scheme, which allows borrowing resources from unused reservation, accord- ing to the characteristics and advantages of cognitive networks. First, some nodes reserve certain proportion capacity for some special services （for instance, some services pay additional money） to guarantee the priority of these applications. Then resources are assigned according to the different parameters of services. If the available resource can not meet the requirements of new services, real- time ones are admitted with higher priority and allow borrowing the unused reservation from other nodes appropriately. Simulations show that, the proposed scheme has good performance at network resource utilization, the admission rate of new aDolications and OoS of users.展开更多
Call admission control (CAC) and resource reservation (RR) for mobile communication are two important factors that guarantee system efficiency and quality of service (QoS) required for different services in a very sca...Call admission control (CAC) and resource reservation (RR) for mobile communication are two important factors that guarantee system efficiency and quality of service (QoS) required for different services in a very scarce resource as the radio spectrum. A new scheme was proposed which extends the concepts of resource sharing and reservations for wideband code division multiple access (WCDMA) systems with a unique feature of soft capacity. Voice and data traffic were considered. The traffic is further classified into handoff and new requests. The reservation thresholds were dynamically adjusted according to the traffic pattern and mobility prediction in order to achieve the maximum channel utilization, while guaranteeing different QoS constraints. The performance of proposed scheme was evaluated using Markov models. New call blocking probability, handoff call dropping probability, and channel utilization were used as benchmarks for the proposed scheme.展开更多
On March 27, 2013, the Ministry of Land and Resources held a news conference to announce a significant achievement in Chinese geological prospecting work in 2012. According to government/industry statistics, proved r...On March 27, 2013, the Ministry of Land and Resources held a news conference to announce a significant achievement in Chinese geological prospecting work in 2012. According to government/industry statistics, proved reserves of oil and natural gas have increase substantially in 2012. Newly proven national petroleum geological reserves are 15.2 million tons, a year-on-year growth of 13%, which is the tenth time of more than 1 billion tons since the founding of People＇s Republic of China; newly proven technically recoverable reserves are 270 million tons, a year-on-year growth of 7%. The 2012 national newly proved reserves from natural gas exploration are 961.22 billion cubic meters, a year-on-year growth of 33%, which is the highest level in our history; the new proven technically recoverable reserves are 500.8 billion cubic meters, a year-on-year growth of 36%. National natural gas production was 106.76 billion cubic meters, a year-on-year growth of 5.4%. The Ordos, Tarim and Sichuan basins are still the main producing areas of natural gas in China. In 2012, national oil production was 205 million tons, a year-on-year growth of 1%, which made a steady increase. The national coal-bed methane production was 2.57 billion cubic meters, a year-on-year growth of 24%.展开更多
1.The Status of Major Mineral Reserves in ChinaSince 1949 162 kinds of minerals and thousands of mining area have been found out in geo-logical exploration,and 149 kinds have been proved reserves.Estimated potential c...1.The Status of Major Mineral Reserves in ChinaSince 1949 162 kinds of minerals and thousands of mining area have been found out in geo-logical exploration,and 149 kinds have been proved reserves.Estimated potential cost of 45 kindsonly of major minerals may be more than one billion RMB(?).China is the one of the great-nations of mineral resources in the world.But the distribution in respect of mineral species is not so ideal as expected.According to theirreserves the minerals can be classified as follows.展开更多
In the calculation of shale gas resources/reserves,isothermal adsorption parameters are mainly determined by dry sample data at the laboratory temperature,and the regression effect of total organic carbon content(TOC)...In the calculation of shale gas resources/reserves,isothermal adsorption parameters are mainly determined by dry sample data at the laboratory temperature,and the regression effect of total organic carbon content(TOC)isothermal adsorption parameters is poor.Based on the physical significance of key parameters in Langmuir and Henry adsorption models,the problems in determining the isothermal adsorption parameters in the calculation of shale gas reserves/reserves are analyzed by taking the marine shale in the Upper Ordovician Wufeng FormingeLower Silurian Longmaxi Formation in the Sichuan Basin as an example.Based on a large number of measured isothermal adsorption data,the effects of TOC,temperature and water saturation on the shale gas adsorption parameters are analyzed.The influence model of TOC,temperature and water saturation on isothermal adsorption parameters of shale gas is established,and a novel method for calculating the adsorption parameters of shale gas from under experimental conditions to original reservoir conditions is proposed.The results are obtained as follows.First,there are problems in the calculation of shale gas resources/reserves,such as poor and contradictoryfitting relation between isothermal adsorption parameters and TOC,difficulty in the conversion of Van't Hoff equation,and difficulty in direct application of water saturation(Sw)in resource/reserves calculation.Second,the problem of poor directfitting relation between Langmuir pressure(pL)and TOC is solved by integrating the Langmuir adsorption model with the Henry adsorption model and by establishing a new parameter e Henry constant a for methane adsorption capacity of shale.Third,when Sw<40%,the Langmuir volume(VL)is linearly negatively correlated with Sw;when Sw<20%,a is constant relatively;by establishing the relationship between the normalized absolute adsorption capacity and Sw(<50%)under the pressure exceeding 30 MPa,the effect of Sw on the isothermal adsorption capacity can be calculated.Fourth,the in-situ stress in the Wufeng FormationeLongmaxi Formation shale reservoir affects the adsorption capacity of shale.For shale reservoirs with the same TOC,the higher the in-situ stress,the smaller the VL and a values.Under high pressure(>30 MPa),the effect of Sw on the methane adsorption capacity of shale shows a similar trend,and the effect of water molecules on the adsorption capacity on shale pore surface is constant.It is concluded that the proposed novel method for determining the isothermal adsorption parameters of shale with different TOC,temperature and water saturation conditions provides a technical support for the accurate calculation of shale gas resources/reserves and contributes to the scientific development of shale gas industry.展开更多
Agricultural land development is a pivotal strategy for addressing the global food security crisis.Barren grassland,especially those in mountainous regions,constitutes critical areas where cultivation can substantiall...Agricultural land development is a pivotal strategy for addressing the global food security crisis.Barren grassland,especially those in mountainous regions,constitutes critical areas where cultivation can substantially enhance land resources.This study highlights the necessity for a precise correlation between land development initiatives and constraints in order to optimize efficiency and enhance the effectiveness of such projects,with the core being the seamless integration of land development engineering and techniques to eliminate agricultural constraints.This study employs a systems engineering approach to classify improvement factors into mobile and fixed categories,elucidating the integration methods of constraint factors.Adhering to the Wooden Barrel Principle,these constraints were rigorously analyzed based on soil quality,land topography,water availability,and agricultural infrastructure.An innovative method of engineering type combination is proposed,which effectively explains the correlation between natural factors combination,project type combination,and target factors combination.It provides a convenient way for the selection of barren grassland development projects and lays a foundation for land planning,development project establishment,program selection,engineering design,and budget preparation.Taking Tang County of China as an example,it is divided into 19 factor improvement areas,a quick reference table of engineering types is established,and 14 main types of engineering combinations are obtained,which lays a foundation for the application of theoretical framework in practice.展开更多
This paper discusses traffic engineering with multi protocol label switching (MPLS) in a backbone of Internet data center (IDC) network. The traditional SPF routing limitations are analyzed and the traffic engineerin...This paper discusses traffic engineering with multi protocol label switching (MPLS) in a backbone of Internet data center (IDC) network. The traditional SPF routing limitations are analyzed and the traffic engineering concept is given. MPLS, resource reservation protocol (RSVP) and enhanced link status Protocols intermediate system to intermediate system (IS IS) are reviewed to provide a background for traffic engineering, the general issues of designing an MPLS system of IDC network for traffic engineering are then discussed. Finally a practical example with MPLS traffic engineering is shown.展开更多
This paper presents a lighter protocol, and it removes the multicast burdens from RSVP to adapt to unicast applications. At the same time, when RSVP is used in wireless networks, some issues about mobility raise popul...This paper presents a lighter protocol, and it removes the multicast burdens from RSVP to adapt to unicast applications. At the same time, when RSVP is used in wireless networks, some issues about mobility raise popular concerns. The proposed protocol a lightweight mobile RSVP protocol, solves the problems by the following mechanisms： changeless flow identifier, a new state management and ＂refresh＂ mechanism.展开更多
Distributed speech recognition (DSR) applications have certain QoS (Quality of service) requirements in terms of latency, packet loss rate, etc. To deliver quality guaranteed DSR application over wirelined or wireless...Distributed speech recognition (DSR) applications have certain QoS (Quality of service) requirements in terms of latency, packet loss rate, etc. To deliver quality guaranteed DSR application over wirelined or wireless links, some QoS mechanisms should be provided. We put forward a RTP/RSVP transmission scheme with DSR-specific payload and QoS parameters by modifying the present WAP protocol stack. The simulation result shows that this scheme will provide adequate network bandwidth to keep the real-time transport of DSR data over either wirelined or wireless channels.展开更多
A distributed and adaptive framework (DAF) was proposed for provisioning quality of service (QoS) in IPv6 network. In DAF, per-flow admission control and resource reservation, in conjunction with a new IPv6 flow label...A distributed and adaptive framework (DAF) was proposed for provisioning quality of service (QoS) in IPv6 network. In DAF, per-flow admission control and resource reservation, in conjunction with a new IPv6 flow label mechanism, can be performed instantaneously in a fully distributed and independent fashion at the edge of network without hop-by-hop signaling. The flow label helps in resource reservation and packets forwarding for aggregated traffic on an edge-to-edge path basis. In addition, a bounded directional probing technique for DAF was designed to reconfigure resource reservation adaptively between every pair of edge router for aggregated traffic according to the fluctuation of its traffic load. The simulation results show that DAF provides QoS guarantees to individual flows with minimal overhead, as well as keeping the scalability characteristic like DiffServ.展开更多
Resource reservation protocols allow communicating hosts to reserve resources such as bandwidth to offer guaranteed service. However, current resource reservation architectures do not scale well for a large number of ...Resource reservation protocols allow communicating hosts to reserve resources such as bandwidth to offer guaranteed service. However, current resource reservation architectures do not scale well for a large number of flows. In this paper, we present a simple reservation protocol and a scalable admission control algorithm, which can provide QoS guarantees to individual flows without per-flow management in the network core. By mapping each flow to a definite time, this scheme addresses the problems that limit the effectiveness of current endpoint admission control schemes. The overall admission control process is described. Analysis is used to explain the reasonability of our scheme and simulation validates its performance.展开更多
This article discusses the issue of resource conflict in the generalized multi-protocol label switching （GMPLS） controlled optical network. Based on the analysis of the current random rebuilding mechanism and its dr...This article discusses the issue of resource conflict in the generalized multi-protocol label switching （GMPLS） controlled optical network. Based on the analysis of the current random rebuilding mechanism and its drawbacks, this article presents two enhanced solutions for improvement, namely, the priority-based resource allocation mechanism and the network management system （NMS） based sequential resource allocation mechanism. Experimental results show that the presented mechanisms perform better than the original random rebuilding solution in terms of the connection setup/recovery time and successful rate.展开更多
As one of the most promising next-generation access network （EPON） should pay more attention to its quality of service （QoS）, techniques, the user-oriented Ethernet passive optical network However, now the EPON ad...As one of the most promising next-generation access network （EPON） should pay more attention to its quality of service （QoS）, techniques, the user-oriented Ethernet passive optical network However, now the EPON adopts mostly differentiated services model （Diffserv） that only provides quality control on traffic aggregation, whereas, the quality of user session cannot be guaranteed when the network is overloaded with substantial connections. This article proposes to apply integrated services model （Intserv） in Diffserv-based EPON, which uses per-flow processing to guarantee QoS. In the simulation, a framework of combined Diffserv and Intserv model is employed in an EPON system, with a dynamic bandwidth allocation algorithm that adapts to it. The simulation results demonstrate that the EPON system with the combined models can provide more flexible, various control for user-oriented service quality.展开更多
As early as on February 7,2014,the National Development and Reform Commission reviewed and formally approved to set up Panxi Strategic Resource Innovation Development Pilot Zone.Since its rare earth resource reserve r...As early as on February 7,2014,the National Development and Reform Commission reviewed and formally approved to set up Panxi Strategic Resource Innovation Development Pilot Zone.Since its rare earth resource reserve ranked second nationwide,a number of counties and districts in Liangshan Prefecture are incorporated into the Pilot Zone,and become core components of this Pilot Zone.展开更多
On August 22,the reporter learned from MLR’s Press Conference for Identified Reserves of Mineral Resources of China in2016 that,China’s investment in mining fixed assets and geological exploration had declined for f...On August 22,the reporter learned from MLR’s Press Conference for Identified Reserves of Mineral Resources of China in2016 that,China’s investment in mining fixed assets and geological exploration had declined for four consecutive years by 2016,and resource reserves growth rate had slowed down due to other reasons such as downturn展开更多
Cooperation of multi-domain massively parallel processor systems in computing grid environment provides new opportunities for multisite job scheduling. At the same time, in the area of co-allocation, heterogeneity, ne...Cooperation of multi-domain massively parallel processor systems in computing grid environment provides new opportunities for multisite job scheduling. At the same time, in the area of co-allocation, heterogeneity, network adaptability and scalability raise the challenge for the international design of multisite job scheduling models and algorithms. It presents multisite job scheduling schema through the introduction of multisite job scheduling model and the performance model under the grid environment. It introduces two job multisite and cooperative scheduling models and algorithms with the core of the optimal and greedy-heuristic resource selection strategies. Meanwhile, compared with single and multisite cooperative scheduling models and algorithms introduced by Sabin, Yahyapour and other persons, the validity and advance of the scheduling model and the performance model herein are proved.展开更多
Voluntary cloud is a new paradigm of cloud computing. It provides an alternative selection along with some well-provisioned clouds. However, for the uncertain time span that participants share their computing resource...Voluntary cloud is a new paradigm of cloud computing. It provides an alternative selection along with some well-provisioned clouds. However, for the uncertain time span that participants share their computing resources in voluntary cloud, there are some challenging issues, i.e., fluctuation, under-capacity and low-benefit. In this paper, an architecture is first proposed based on Bittorrent protocol. In this architecture, resources could be reserved or requested from Reserved Instance Marketplace and could be accessed with a lower price in a short circle. Actually, these resources could replenish the inadequate resource pool and relieve the fluctuation and under-capacity issue in voluntary cloud. Then, the fault rate of each node is used to evaluate the uncertainty of its sharing time. By leveraging a linear prediction model, it is enabled by a distribution function which is used for evaluating the computing capacity of the system. Moreover, the cost optimization problem is investigated and a computational method is presented to solve the low-benefit issue in voluntary cloud. At last, the system performance is validated by two sets of simulations. And the experimental results show the effectiveness of our computational method for resource reservation optimization.展开更多
基金Supported by the High Technology Research and Development Program of China(No.2009AA01Z211)the Fundamental Research Funds for Central Universities of China(No.2009YJS034)+1 种基金Beijing Nature Science Foundation of China(No.4112044)the Research Fund for the Doctoral Program of Higer Education of China(No.20120009110009)
文摘Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the analysis of active queue management （AQM） of DiffServ network, we propose a resource management scheme, which allows borrowing resources from unused reservation, accord- ing to the characteristics and advantages of cognitive networks. First, some nodes reserve certain proportion capacity for some special services （for instance, some services pay additional money） to guarantee the priority of these applications. Then resources are assigned according to the different parameters of services. If the available resource can not meet the requirements of new services, real- time ones are admitted with higher priority and allow borrowing the unused reservation from other nodes appropriately. Simulations show that, the proposed scheme has good performance at network resource utilization, the admission rate of new aDolications and OoS of users.
文摘Call admission control (CAC) and resource reservation (RR) for mobile communication are two important factors that guarantee system efficiency and quality of service (QoS) required for different services in a very scarce resource as the radio spectrum. A new scheme was proposed which extends the concepts of resource sharing and reservations for wideband code division multiple access (WCDMA) systems with a unique feature of soft capacity. Voice and data traffic were considered. The traffic is further classified into handoff and new requests. The reservation thresholds were dynamically adjusted according to the traffic pattern and mobility prediction in order to achieve the maximum channel utilization, while guaranteeing different QoS constraints. The performance of proposed scheme was evaluated using Markov models. New call blocking probability, handoff call dropping probability, and channel utilization were used as benchmarks for the proposed scheme.
文摘On March 27, 2013, the Ministry of Land and Resources held a news conference to announce a significant achievement in Chinese geological prospecting work in 2012. According to government/industry statistics, proved reserves of oil and natural gas have increase substantially in 2012. Newly proven national petroleum geological reserves are 15.2 million tons, a year-on-year growth of 13%, which is the tenth time of more than 1 billion tons since the founding of People＇s Republic of China; newly proven technically recoverable reserves are 270 million tons, a year-on-year growth of 7%. The 2012 national newly proved reserves from natural gas exploration are 961.22 billion cubic meters, a year-on-year growth of 33%, which is the highest level in our history; the new proven technically recoverable reserves are 500.8 billion cubic meters, a year-on-year growth of 36%. National natural gas production was 106.76 billion cubic meters, a year-on-year growth of 5.4%. The Ordos, Tarim and Sichuan basins are still the main producing areas of natural gas in China. In 2012, national oil production was 205 million tons, a year-on-year growth of 1%, which made a steady increase. The national coal-bed methane production was 2.57 billion cubic meters, a year-on-year growth of 24%.
文摘1.The Status of Major Mineral Reserves in ChinaSince 1949 162 kinds of minerals and thousands of mining area have been found out in geo-logical exploration,and 149 kinds have been proved reserves.Estimated potential cost of 45 kindsonly of major minerals may be more than one billion RMB(?).China is the one of the great-nations of mineral resources in the world.But the distribution in respect of mineral species is not so ideal as expected.According to theirreserves the minerals can be classified as follows.
基金supported by the Scientific Research and Technol-ogy Development Project of PetroChina Company Limited,"Research on Geological Activity Evaluation Technology of shale gas Development Zone"(No.2022DJ80)"Research on Exploration and Development Technology of Marine shale gas"(No.2021DJ19).
文摘In the calculation of shale gas resources/reserves,isothermal adsorption parameters are mainly determined by dry sample data at the laboratory temperature,and the regression effect of total organic carbon content(TOC)isothermal adsorption parameters is poor.Based on the physical significance of key parameters in Langmuir and Henry adsorption models,the problems in determining the isothermal adsorption parameters in the calculation of shale gas reserves/reserves are analyzed by taking the marine shale in the Upper Ordovician Wufeng FormingeLower Silurian Longmaxi Formation in the Sichuan Basin as an example.Based on a large number of measured isothermal adsorption data,the effects of TOC,temperature and water saturation on the shale gas adsorption parameters are analyzed.The influence model of TOC,temperature and water saturation on isothermal adsorption parameters of shale gas is established,and a novel method for calculating the adsorption parameters of shale gas from under experimental conditions to original reservoir conditions is proposed.The results are obtained as follows.First,there are problems in the calculation of shale gas resources/reserves,such as poor and contradictoryfitting relation between isothermal adsorption parameters and TOC,difficulty in the conversion of Van't Hoff equation,and difficulty in direct application of water saturation(Sw)in resource/reserves calculation.Second,the problem of poor directfitting relation between Langmuir pressure(pL)and TOC is solved by integrating the Langmuir adsorption model with the Henry adsorption model and by establishing a new parameter e Henry constant a for methane adsorption capacity of shale.Third,when Sw<40%,the Langmuir volume(VL)is linearly negatively correlated with Sw;when Sw<20%,a is constant relatively;by establishing the relationship between the normalized absolute adsorption capacity and Sw(<50%)under the pressure exceeding 30 MPa,the effect of Sw on the isothermal adsorption capacity can be calculated.Fourth,the in-situ stress in the Wufeng FormationeLongmaxi Formation shale reservoir affects the adsorption capacity of shale.For shale reservoirs with the same TOC,the higher the in-situ stress,the smaller the VL and a values.Under high pressure(>30 MPa),the effect of Sw on the methane adsorption capacity of shale shows a similar trend,and the effect of water molecules on the adsorption capacity on shale pore surface is constant.It is concluded that the proposed novel method for determining the isothermal adsorption parameters of shale with different TOC,temperature and water saturation conditions provides a technical support for the accurate calculation of shale gas resources/reserves and contributes to the scientific development of shale gas industry.
基金funded by Science and Technology Project of Hebei Education Department[QN2023085].
文摘Agricultural land development is a pivotal strategy for addressing the global food security crisis.Barren grassland,especially those in mountainous regions,constitutes critical areas where cultivation can substantially enhance land resources.This study highlights the necessity for a precise correlation between land development initiatives and constraints in order to optimize efficiency and enhance the effectiveness of such projects,with the core being the seamless integration of land development engineering and techniques to eliminate agricultural constraints.This study employs a systems engineering approach to classify improvement factors into mobile and fixed categories,elucidating the integration methods of constraint factors.Adhering to the Wooden Barrel Principle,these constraints were rigorously analyzed based on soil quality,land topography,water availability,and agricultural infrastructure.An innovative method of engineering type combination is proposed,which effectively explains the correlation between natural factors combination,project type combination,and target factors combination.It provides a convenient way for the selection of barren grassland development projects and lays a foundation for land planning,development project establishment,program selection,engineering design,and budget preparation.Taking Tang County of China as an example,it is divided into 19 factor improvement areas,a quick reference table of engineering types is established,and 14 main types of engineering combinations are obtained,which lays a foundation for the application of theoretical framework in practice.
文摘This paper discusses traffic engineering with multi protocol label switching (MPLS) in a backbone of Internet data center (IDC) network. The traditional SPF routing limitations are analyzed and the traffic engineering concept is given. MPLS, resource reservation protocol (RSVP) and enhanced link status Protocols intermediate system to intermediate system (IS IS) are reviewed to provide a background for traffic engineering, the general issues of designing an MPLS system of IDC network for traffic engineering are then discussed. Finally a practical example with MPLS traffic engineering is shown.
文摘This paper presents a lighter protocol, and it removes the multicast burdens from RSVP to adapt to unicast applications. At the same time, when RSVP is used in wireless networks, some issues about mobility raise popular concerns. The proposed protocol a lightweight mobile RSVP protocol, solves the problems by the following mechanisms： changeless flow identifier, a new state management and ＂refresh＂ mechanism.
文摘Distributed speech recognition (DSR) applications have certain QoS (Quality of service) requirements in terms of latency, packet loss rate, etc. To deliver quality guaranteed DSR application over wirelined or wireless links, some QoS mechanisms should be provided. We put forward a RTP/RSVP transmission scheme with DSR-specific payload and QoS parameters by modifying the present WAP protocol stack. The simulation result shows that this scheme will provide adequate network bandwidth to keep the real-time transport of DSR data over either wirelined or wireless channels.
文摘A distributed and adaptive framework (DAF) was proposed for provisioning quality of service (QoS) in IPv6 network. In DAF, per-flow admission control and resource reservation, in conjunction with a new IPv6 flow label mechanism, can be performed instantaneously in a fully distributed and independent fashion at the edge of network without hop-by-hop signaling. The flow label helps in resource reservation and packets forwarding for aggregated traffic on an edge-to-edge path basis. In addition, a bounded directional probing technique for DAF was designed to reconfigure resource reservation adaptively between every pair of edge router for aggregated traffic according to the fluctuation of its traffic load. The simulation results show that DAF provides QoS guarantees to individual flows with minimal overhead, as well as keeping the scalability characteristic like DiffServ.
文摘Resource reservation protocols allow communicating hosts to reserve resources such as bandwidth to offer guaranteed service. However, current resource reservation architectures do not scale well for a large number of flows. In this paper, we present a simple reservation protocol and a scalable admission control algorithm, which can provide QoS guarantees to individual flows without per-flow management in the network core. By mapping each flow to a definite time, this scheme addresses the problems that limit the effectiveness of current endpoint admission control schemes. The overall admission control process is described. Analysis is used to explain the reasonability of our scheme and simulation validates its performance.
基金National Natural Science Foundation of China (60572021, 60710047)the National Basic Research Program of China (2007CB310705)+3 种基金the Hi-Tech Research and Development Program of China (2006AA01Z243)NCET (06-0090), PCSIRT (IRT0609)ISTCP (2006DFA11040)111 Project (B07005)
文摘This article discusses the issue of resource conflict in the generalized multi-protocol label switching （GMPLS） controlled optical network. Based on the analysis of the current random rebuilding mechanism and its drawbacks, this article presents two enhanced solutions for improvement, namely, the priority-based resource allocation mechanism and the network management system （NMS） based sequential resource allocation mechanism. Experimental results show that the presented mechanisms perform better than the original random rebuilding solution in terms of the connection setup/recovery time and successful rate.
基金supported by the National Basic Research Program of China(2007CB310705)the National Natural Science Foundation of China(60772024)+2 种基金the Hi-Tech Research and Development Program of China(2007AA01Z255)PCSIRT(IRT0609)ISTCP(2006DFA 11040)
文摘As one of the most promising next-generation access network （EPON） should pay more attention to its quality of service （QoS）, techniques, the user-oriented Ethernet passive optical network However, now the EPON adopts mostly differentiated services model （Diffserv） that only provides quality control on traffic aggregation, whereas, the quality of user session cannot be guaranteed when the network is overloaded with substantial connections. This article proposes to apply integrated services model （Intserv） in Diffserv-based EPON, which uses per-flow processing to guarantee QoS. In the simulation, a framework of combined Diffserv and Intserv model is employed in an EPON system, with a dynamic bandwidth allocation algorithm that adapts to it. The simulation results demonstrate that the EPON system with the combined models can provide more flexible, various control for user-oriented service quality.
文摘As early as on February 7,2014,the National Development and Reform Commission reviewed and formally approved to set up Panxi Strategic Resource Innovation Development Pilot Zone.Since its rare earth resource reserve ranked second nationwide,a number of counties and districts in Liangshan Prefecture are incorporated into the Pilot Zone,and become core components of this Pilot Zone.
文摘On August 22,the reporter learned from MLR’s Press Conference for Identified Reserves of Mineral Resources of China in2016 that,China’s investment in mining fixed assets and geological exploration had declined for four consecutive years by 2016,and resource reserves growth rate had slowed down due to other reasons such as downturn
基金This work was supported in part by the National Natural Science Foundation of China （Grant No. 90412001） the National Grand Fundamental Research 973 Program of China （Grant No. G2005CB321806）.
文摘Cooperation of multi-domain massively parallel processor systems in computing grid environment provides new opportunities for multisite job scheduling. At the same time, in the area of co-allocation, heterogeneity, network adaptability and scalability raise the challenge for the international design of multisite job scheduling models and algorithms. It presents multisite job scheduling schema through the introduction of multisite job scheduling model and the performance model under the grid environment. It introduces two job multisite and cooperative scheduling models and algorithms with the core of the optimal and greedy-heuristic resource selection strategies. Meanwhile, compared with single and multisite cooperative scheduling models and algorithms introduced by Sabin, Yahyapour and other persons, the validity and advance of the scheduling model and the performance model herein are proved.
基金This work was partially supported by the National Natural Science Foundation of China under Grant Nos. 91318301 and 61672276, the Key Research and Development Project of Jiangsu Province of China under Grant Nos. BE2015154 and BE2016120, the Collaborative Innovation Center of Novel Software Technology of Nanjing University, and the EU FP7 CROWN Project under Grant No. PIRSES-GA-2013-610524.
文摘Voluntary cloud is a new paradigm of cloud computing. It provides an alternative selection along with some well-provisioned clouds. However, for the uncertain time span that participants share their computing resources in voluntary cloud, there are some challenging issues, i.e., fluctuation, under-capacity and low-benefit. In this paper, an architecture is first proposed based on Bittorrent protocol. In this architecture, resources could be reserved or requested from Reserved Instance Marketplace and could be accessed with a lower price in a short circle. Actually, these resources could replenish the inadequate resource pool and relieve the fluctuation and under-capacity issue in voluntary cloud. Then, the fault rate of each node is used to evaluate the uncertainty of its sharing time. By leveraging a linear prediction model, it is enabled by a distribution function which is used for evaluating the computing capacity of the system. Moreover, the cost optimization problem is investigated and a computational method is presented to solve the low-benefit issue in voluntary cloud. At last, the system performance is validated by two sets of simulations. And the experimental results show the effectiveness of our computational method for resource reservation optimization.
