Delivering IPTV services entails a complex integration of a variety of industries as well as the support of network,computer,and image processing technologies. That is to say,the IPTV architecture should carry a myria...Delivering IPTV services entails a complex integration of a variety of industries as well as the support of network,computer,and image processing technologies. That is to say,the IPTV architecture should carry a myriad of services and technologies. In light of current telecom/TV status,the IPTV architecture can be set up on the convergence of the three networks to deliver comprehensive services and make Live TV,TV on Demand (TVOD),and Time-shifted TV services accessible on one platform. It also supports local and cross-regional user and service certification,provides EPG and smooth TV images and guarantees secured content as well.展开更多
The global sustained low oil prices have a significant impact on China's oil and gas industry system and the national energy security.This paper aims to find solutions in order to guarantee the smooth development ...The global sustained low oil prices have a significant impact on China's oil and gas industry system and the national energy security.This paper aims to find solutions in order to guarantee the smooth development of China's oil and gas industry system and its survival in such a severe environment.First,the origins of sustained low oil prices were analyzed.Then,based on those published data from IEA,government and some other authorities,this study focused on the development status,energy policies and the future developing trend of those main oil&gas producing countries.Investigations show that the low-price running is primarily contributed to the so-called oil and gas policies in the USA.It is predicted that national petroleum consumption will reach up to 6.0×10^(8) t(oil)&3300×10^(8) m^(3)(gas)in 2020 and 6.8×10^(8) t(oil)&5200×10^(8) m^(3)(gas)in 2030.For reducing the dependence on foreign oil and gas,the investment in the upstream of oil and gas industry should be maintained and scientific research should be intensified to ensure the smooth operation of the oil and gas production system.Considering China's national energy security strategy,the following suggestions were proposed herein.First,ensure that in China the yearly oil output reaches 2×10^(8) t,while natural gas yield will be expected to be up to 2700×10^(8) m^(3)in 2030,both of which should become the“bottom line”in the long term.Second,focus on the planning of upstream business with insistence on risk exploration investment,scientific and technological innovation and pilot area construction especially for low-permeability tight oil&gas,shale oil&gas reservoir development techniques.Third,encourage the in-depth reform and further growth especially in the three major state-owned oil&gas companies under adverse situations,and create more companies competent to offer overseas technical services by taking the opportunity of the“One Belt and One Road”policy.Finally,promote the new energy business and find solutions to turning those oil companies to integrated energy companies.展开更多
Purpose-The success of web services involved the adoption of this technology by different service providers through the web,which increased the number of web services,as a result making their discovery a tedious task....Purpose-The success of web services involved the adoption of this technology by different service providers through the web,which increased the number of web services,as a result making their discovery a tedious task.The UDDI standard has been proposed for web service publication and discovery.However,it lacks sufficient semantic description in the content of web services,which makes it difficult to find and compose suitable web services during the analysis,search,and matching processes.In addition,few works on semantic web services discovery take into account the user’s profile.The purpose of this paper is to optimize the web services discovery by reducing the search space and increasing the number of relevant services.Design/methodology/approach-The authors propose a new approach for the semantic web services discovery based on the mobile agent,user profile and metadata catalog.In the approach,each user can be described by a profile which is represented in two dimensions:personal dimension and preferences dimension.The description of web service is based on two levels:metadata catalog and WSDL.Findings-First,the semantic web services discovery reduces the number of relevant services through the application of matching algorithm“semantic match”.The result of this first matching restricts the search space at the level of UDDI registry,which allows the users to have good results for the“functional match”.Second,the use of mobile agents as a communication entity reduces the traffic on the network and the quantity of exchanged information.Finally,the integration of user profile in the service discovery process facilitates the expression of the user needs and makes intelligible the selected service.Originality/value-To the best knowledge of the authors,this is the first attempt at implementing the mobile agent technology with the semantic web service technology.展开更多
文摘Delivering IPTV services entails a complex integration of a variety of industries as well as the support of network,computer,and image processing technologies. That is to say,the IPTV architecture should carry a myriad of services and technologies. In light of current telecom/TV status,the IPTV architecture can be set up on the convergence of the three networks to deliver comprehensive services and make Live TV,TV on Demand (TVOD),and Time-shifted TV services accessible on one platform. It also supports local and cross-regional user and service certification,provides EPG and smooth TV images and guarantees secured content as well.
基金Project supported by the National Basic Research Program of China(973 Program)“Basic Research on Efficient Development of Marine Shale Gas in Southern China”(Grant No.2013CB228000)the National Major Science and Technology Program during the“12th Five-Year Plan”“Key Techniques for Shale Gas Exploration and Development”(Grant No.2011ZX05018).
文摘The global sustained low oil prices have a significant impact on China's oil and gas industry system and the national energy security.This paper aims to find solutions in order to guarantee the smooth development of China's oil and gas industry system and its survival in such a severe environment.First,the origins of sustained low oil prices were analyzed.Then,based on those published data from IEA,government and some other authorities,this study focused on the development status,energy policies and the future developing trend of those main oil&gas producing countries.Investigations show that the low-price running is primarily contributed to the so-called oil and gas policies in the USA.It is predicted that national petroleum consumption will reach up to 6.0×10^(8) t(oil)&3300×10^(8) m^(3)(gas)in 2020 and 6.8×10^(8) t(oil)&5200×10^(8) m^(3)(gas)in 2030.For reducing the dependence on foreign oil and gas,the investment in the upstream of oil and gas industry should be maintained and scientific research should be intensified to ensure the smooth operation of the oil and gas production system.Considering China's national energy security strategy,the following suggestions were proposed herein.First,ensure that in China the yearly oil output reaches 2×10^(8) t,while natural gas yield will be expected to be up to 2700×10^(8) m^(3)in 2030,both of which should become the“bottom line”in the long term.Second,focus on the planning of upstream business with insistence on risk exploration investment,scientific and technological innovation and pilot area construction especially for low-permeability tight oil&gas,shale oil&gas reservoir development techniques.Third,encourage the in-depth reform and further growth especially in the three major state-owned oil&gas companies under adverse situations,and create more companies competent to offer overseas technical services by taking the opportunity of the“One Belt and One Road”policy.Finally,promote the new energy business and find solutions to turning those oil companies to integrated energy companies.
文摘Purpose-The success of web services involved the adoption of this technology by different service providers through the web,which increased the number of web services,as a result making their discovery a tedious task.The UDDI standard has been proposed for web service publication and discovery.However,it lacks sufficient semantic description in the content of web services,which makes it difficult to find and compose suitable web services during the analysis,search,and matching processes.In addition,few works on semantic web services discovery take into account the user’s profile.The purpose of this paper is to optimize the web services discovery by reducing the search space and increasing the number of relevant services.Design/methodology/approach-The authors propose a new approach for the semantic web services discovery based on the mobile agent,user profile and metadata catalog.In the approach,each user can be described by a profile which is represented in two dimensions:personal dimension and preferences dimension.The description of web service is based on two levels:metadata catalog and WSDL.Findings-First,the semantic web services discovery reduces the number of relevant services through the application of matching algorithm“semantic match”.The result of this first matching restricts the search space at the level of UDDI registry,which allows the users to have good results for the“functional match”.Second,the use of mobile agents as a communication entity reduces the traffic on the network and the quantity of exchanged information.Finally,the integration of user profile in the service discovery process facilitates the expression of the user needs and makes intelligible the selected service.Originality/value-To the best knowledge of the authors,this is the first attempt at implementing the mobile agent technology with the semantic web service technology.
