Contact between mobile hosts and database servers presents many problems in theMobile Database System(MDS).It is harmed by a variety of causes,including handoff,inadequate capacity,frequent transaction updates,and rep...Contact between mobile hosts and database servers presents many problems in theMobile Database System(MDS).It is harmed by a variety of causes,including handoff,inadequate capacity,frequent transaction updates,and repeated failures,both of which contribute to serious issues with the information system’s consistency.However,error tolerance technicality allows devices to continue performing their functions in the event of a failure.The aim of this paper is to identify the optimal recovery approach from among the available state-of-the-art techniques in MDS by employing game theory.Several of the presented recovery protocols are chosen and evaluated in order to determine the most critical factors affecting the recovery mechanism,such as the number of processes,the time required to deliver messages,and the number of messages logged-in time.Then,using the suggested payout matrix,the game theory strategy is adapted to choose the optimum recovery technique for the specified environmental variables.The NS2 simulatorwas used to carry out the tests and apply the chosen recovery protocols.The experiments validate the proposed model’s usefulness in comparison to other methods.展开更多
Oil and gas resource situation of China Overall discovered maturity of oil and gas resources not high According to all previous nationwide estimates of oilgas resources, the total resources is relatively abundant ...Oil and gas resource situation of China Overall discovered maturity of oil and gas resources not high According to all previous nationwide estimates of oilgas resources, the total resources is relatively abundant in China. The latest resource assessment results, performed by China＇s three national oil companies （CNPC, Sinopec and CNOOC）, also indicate that petroleum exploration still has a solid resource base. According to the latest nationwide petroleum resource assessment results and the proved oil and gas geologic reserves at the end of 2004, the average discovery maturity of recoverable oil reserves is 20% in China, with 40% in east China, 14% in westcentral China and 14.5% in offshore China, reflecting that petroleum exploration is still in middle stage with considerable exploration potential.展开更多
During the process of economic globalization, China＇s inbound tourism has developed strongly. The present paper deals with one of the core issues of the international tourism industry： inbound tourist revenue. With ...During the process of economic globalization, China＇s inbound tourism has developed strongly. The present paper deals with one of the core issues of the international tourism industry： inbound tourist revenue. With the aid of conventional theories and the use of empirical tests, our study identifies some decisive factors that have influenced China＇s inbound tourist revenue through an analysis of the global and local conditions at macro and micro levels. The findings were then linked to the Olympic Games, the mega event having impacted international tourism. The findings were also linked to further.discussions and suggestions for the interactions between the Beijing Olympic Games 2008 and China＇s inbound tourism.展开更多
文摘Contact between mobile hosts and database servers presents many problems in theMobile Database System(MDS).It is harmed by a variety of causes,including handoff,inadequate capacity,frequent transaction updates,and repeated failures,both of which contribute to serious issues with the information system’s consistency.However,error tolerance technicality allows devices to continue performing their functions in the event of a failure.The aim of this paper is to identify the optimal recovery approach from among the available state-of-the-art techniques in MDS by employing game theory.Several of the presented recovery protocols are chosen and evaluated in order to determine the most critical factors affecting the recovery mechanism,such as the number of processes,the time required to deliver messages,and the number of messages logged-in time.Then,using the suggested payout matrix,the game theory strategy is adapted to choose the optimum recovery technique for the specified environmental variables.The NS2 simulatorwas used to carry out the tests and apply the chosen recovery protocols.The experiments validate the proposed model’s usefulness in comparison to other methods.
文摘Oil and gas resource situation of China Overall discovered maturity of oil and gas resources not high According to all previous nationwide estimates of oilgas resources, the total resources is relatively abundant in China. The latest resource assessment results, performed by China＇s three national oil companies （CNPC, Sinopec and CNOOC）, also indicate that petroleum exploration still has a solid resource base. According to the latest nationwide petroleum resource assessment results and the proved oil and gas geologic reserves at the end of 2004, the average discovery maturity of recoverable oil reserves is 20% in China, with 40% in east China, 14% in westcentral China and 14.5% in offshore China, reflecting that petroleum exploration is still in middle stage with considerable exploration potential.
文摘During the process of economic globalization, China＇s inbound tourism has developed strongly. The present paper deals with one of the core issues of the international tourism industry： inbound tourist revenue. With the aid of conventional theories and the use of empirical tests, our study identifies some decisive factors that have influenced China＇s inbound tourist revenue through an analysis of the global and local conditions at macro and micro levels. The findings were then linked to the Olympic Games, the mega event having impacted international tourism. The findings were also linked to further.discussions and suggestions for the interactions between the Beijing Olympic Games 2008 and China＇s inbound tourism.
