A new collusion attack on Pour-like schemes is proposed in this paper. Then, we present a collusion-free centralized multicast key management scheme based on characteristic values of members. The re-keying method that...A new collusion attack on Pour-like schemes is proposed in this paper. Then, we present a collusion-free centralized multicast key management scheme based on characteristic values of members. The re-keying method that other group members calculate new keys when a member is joining or leaving is also designed. It achieves forward secrecy and backward secrecy. Compared with typical existing centralized schemes, the storage of Group Key Controller (GKC) in our scheme halves the storage overhead of others, and communication overhead of GKC is 2 in case of joining re-keying. Especially, the leaving re-keying overhead is and the overall performance is excellent.展开更多
<span style="font-family:;" "=""><span style="font-family:Verdana;">In this paper, it was introduced that </span><i><span style="font-family:Verdana;&...<span style="font-family:;" "=""><span style="font-family:Verdana;">In this paper, it was introduced that </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> is a traditional dual-</span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">use edible and medicine crops in China, and the nutritional components and medicinal value of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> were described. Based on the published literature at home and abroad, a variety of chemical components found in </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;"> and their medicinal effects were reviewed. At the same time,</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">the problems existing in the production of </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;"> were put forward. With the improvement of people’s living standards, the nutritional and health care value of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> has been paid more and more attention.</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">The problems of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> in production were analyzed.</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">Some biological characteristics of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;">, especially its hygrophyte characteristics, were re-recognized, which is very important to increase the yield of </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;">. In the paper, the key cultivation techniques for high and stable yield of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> were also summarized. In order to obtain high quality, high and stable yield, we should adopt the new technical methods of “two wet, two dry and two water” in water management. At </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">same time, if artificial pollination is applied in the peak of flowering period, the seed setting rate and the yield will be increased.</span>展开更多
National key eco-function zones for water and soil conservation are exceptionally fragile areas in terms of their eco-environments and are also severely affected by water and soil loss. They have been a focus of atten...National key eco-function zones for water and soil conservation are exceptionally fragile areas in terms of their eco-environments and are also severely affected by water and soil loss. They have been a focus of attention from all sectors of society. This research assesses important ecosystem service functions and their values using such indexes as NPP, soil conservation quantity and water conservation quantity. The result indicates that the ecosystem services of China＇s eco-function zones for water and soil conservation are worth 3268.90×10^8 CNY in total, of which organic matter production accounts for 530.96×10^8 CNY, nutrient substance circulation and storage 301.91×10^8 CNY, carbon fixation and oxygen release 1616.16×10^8 CNY, soil conservation 442.70×10^8 CNY and water source conservation 816.20×10^8 CNY. Of the four functional zones, the Guangxi-Guizhou-Yunnan Area registers the highest value of 1551.30×10^8 CNY, and the Three Gorges Reservoir Area the lowest value of 448.15×10^8CNY. In terms of ecosystem service value per unit of area, the Guangxi-Guizhou-Yunnan Area takes the first place, followed by Three Gorges Reservoir Area and the Dabie Mountain Area, which are roughly equivalent, and finally the Loess Plateau Area is at the bottom.展开更多
Distributed key value storage systems are among the most important types of distributed storage systems currently deployed in data centers. Nowadays, enterprise data centers are facing growing pressure in reducing the...Distributed key value storage systems are among the most important types of distributed storage systems currently deployed in data centers. Nowadays, enterprise data centers are facing growing pressure in reducing their power consumption. In this paper, we propose GreenCHT, a reliable power management scheme for consistent hashing based distributed key value storage systems. It consists of a multi-tier replication scheme, a reliable distributed log store, and a predictive power mode scheduler （PMS）. Instead of randomly placing replicas of each object on a number of nodes in the consistent hash ring, we arrange the replicas of objects on nonoverlapping tiers of nodes in the ring. This allows the system to fall in various power modes by powering down subsets of servers while not violating data availability. The predictive PMS predicts workloads and adapts to load fluctuation. It cooperates with the multi-tier replication strategy to provide power proportionality for the system. To ensure that the reliability of the system is maintained when replicas are powered down, we distribute the writes to standby replicas to active servers, which ensures failure tolerance of the system. GreenCHT is implemented based on Sheepdog, a distributed key value storage system that uses consistent hashing as an underlying distributed hash table. By replaying 12 typical real workload traces collected from Microsoft, the evaluation results show that GreenCHT can provide significant power savings while maintaining a desired performance. We observe that GreenCHT can reduce power consumption by up to 35%-61%.展开更多
文摘A new collusion attack on Pour-like schemes is proposed in this paper. Then, we present a collusion-free centralized multicast key management scheme based on characteristic values of members. The re-keying method that other group members calculate new keys when a member is joining or leaving is also designed. It achieves forward secrecy and backward secrecy. Compared with typical existing centralized schemes, the storage of Group Key Controller (GKC) in our scheme halves the storage overhead of others, and communication overhead of GKC is 2 in case of joining re-keying. Especially, the leaving re-keying overhead is and the overall performance is excellent.
文摘<span style="font-family:;" "=""><span style="font-family:Verdana;">In this paper, it was introduced that </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> is a traditional dual-</span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">use edible and medicine crops in China, and the nutritional components and medicinal value of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> were described. Based on the published literature at home and abroad, a variety of chemical components found in </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;"> and their medicinal effects were reviewed. At the same time,</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">the problems existing in the production of </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;"> were put forward. With the improvement of people’s living standards, the nutritional and health care value of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> has been paid more and more attention.</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">The problems of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> in production were analyzed.</span></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">Some biological characteristics of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;">, especially its hygrophyte characteristics, were re-recognized, which is very important to increase the yield of </span><i><span style="font-family:Verdana;">Coix lacryma jobi</span></i><span style="font-family:Verdana;">. In the paper, the key cultivation techniques for high and stable yield of </span><i><span style="font-family:Verdana;">Coix lacryma-jobi</span></i><span style="font-family:Verdana;"> were also summarized. In order to obtain high quality, high and stable yield, we should adopt the new technical methods of “two wet, two dry and two water” in water management. At </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">same time, if artificial pollination is applied in the peak of flowering period, the seed setting rate and the yield will be increased.</span>
基金National Natural Science Foundation of China(41371486)National Key Research and Development Program(2016YFC0503706,2016YFC0503403)
文摘National key eco-function zones for water and soil conservation are exceptionally fragile areas in terms of their eco-environments and are also severely affected by water and soil loss. They have been a focus of attention from all sectors of society. This research assesses important ecosystem service functions and their values using such indexes as NPP, soil conservation quantity and water conservation quantity. The result indicates that the ecosystem services of China＇s eco-function zones for water and soil conservation are worth 3268.90×10^8 CNY in total, of which organic matter production accounts for 530.96×10^8 CNY, nutrient substance circulation and storage 301.91×10^8 CNY, carbon fixation and oxygen release 1616.16×10^8 CNY, soil conservation 442.70×10^8 CNY and water source conservation 816.20×10^8 CNY. Of the four functional zones, the Guangxi-Guizhou-Yunnan Area registers the highest value of 1551.30×10^8 CNY, and the Three Gorges Reservoir Area the lowest value of 448.15×10^8CNY. In terms of ecosystem service value per unit of area, the Guangxi-Guizhou-Yunnan Area takes the first place, followed by Three Gorges Reservoir Area and the Dabie Mountain Area, which are roughly equivalent, and finally the Loess Plateau Area is at the bottom.
文摘Distributed key value storage systems are among the most important types of distributed storage systems currently deployed in data centers. Nowadays, enterprise data centers are facing growing pressure in reducing their power consumption. In this paper, we propose GreenCHT, a reliable power management scheme for consistent hashing based distributed key value storage systems. It consists of a multi-tier replication scheme, a reliable distributed log store, and a predictive power mode scheduler （PMS）. Instead of randomly placing replicas of each object on a number of nodes in the consistent hash ring, we arrange the replicas of objects on nonoverlapping tiers of nodes in the ring. This allows the system to fall in various power modes by powering down subsets of servers while not violating data availability. The predictive PMS predicts workloads and adapts to load fluctuation. It cooperates with the multi-tier replication strategy to provide power proportionality for the system. To ensure that the reliability of the system is maintained when replicas are powered down, we distribute the writes to standby replicas to active servers, which ensures failure tolerance of the system. GreenCHT is implemented based on Sheepdog, a distributed key value storage system that uses consistent hashing as an underlying distributed hash table. By replaying 12 typical real workload traces collected from Microsoft, the evaluation results show that GreenCHT can provide significant power savings while maintaining a desired performance. We observe that GreenCHT can reduce power consumption by up to 35%-61%.
