Greening Multi-Tenant Data Center Demand Response

Data centers have emerged as promising resources for demand response, particularly for emergency demand response (EDR), which saves the power grid from incurring blackouts during emergency situations. However, currently, data centers typically participate in EDR by turning on backup (diesel) generators, which is both expensive and environmentally unfriendly. In this paper, we focus on "greening" demand response in multi-tenant data centers, i.e., colocation data centers, by designing a pricing mechanism through which the data center operator can efficiently extract load reductions from tenants during emergency periods to fulfill energy reduction requirement for EDR. In particular, we propose a pricing mechanism for both mandatory and voluntary EDR programs, ColoEDR, that is based on parameterized supply function bidding and provides provably near-optimal efficiency guarantees, both when tenants are price-taking and when they are price-anticipating. In addition to analytic results, we extend the literature on supply function mechanism design, and evaluate ColoEDR using trace-based simulation studies. These validate the efficiency analysis and conclude that the pricing mechanism is both beneficial to the environment and to the data center operator (by decreasing the need for backup diesel generation), while also aiding tenants (by providing payments for load reductions).Comment: 34 pages, 6 figure

Dynamics of delay induced composite multi-scroll attractor and its application in encryption

This work was supported in part by NSFC (60804040, 61172070), Key Program of Nature Science Foundation of Shaanxi Province (2016ZDJC-01), Innovative Research Team of Shaanxi Province(2013KCT-04), Fok Ying Tong Education Foundation Young Teacher Foundation(111065), Chao Bai was supported by Excellent Ph.D. research fund (310-252071603) at XAUT.Peer reviewedPostprin

China's GDP in U.S. dollars based on purchasing power parity

China's gross domestic product per capita was only US$300 to$370 in 1980-91 in an estimate based on the World Bank Atlas approach used in the World Development Report. These estimates fail to capture the fact that in the 10 years since embarking on a program of economic reform aimed at rapid economic development, China has been one of the fastest growing economies in the world. Knowing what its true standard of living and productive potential is important not only for measuring the size of China's economy but for assessing its growth performance. The authors provide a detailed comparison of the GDP of China and the United States using the purchasing power parity approach formulated by the U.N. International Comparison Program (ICP), with 1986 as a base. Using this approach, which establishes a conversion factor based on prices for comparable items rather than on exchange rates, they find that: 1) China's per capita GDP in 1986 international dollars in between $770 and$1,044, depending on assumptions made about comparison-resistant service sectors and quality adjustments made in a number of selected ones in calculating purchasing power parities; and 2) China's per capita GDP in 1991 international dollars is between $1,227 and$1,663, allowing for the impact of inflation in the United States on the purchasing power parity and growth rates in China computed from national currency GDP data in constant prices.Environmental Economics&Policies,Economic Theory&Research,Payment Systems&Infrastructure,Public Health Promotion,Health Economics&Finance,Economic Theory&Research,Environmental Economics&Policies,Health Economics&Finance,Access to Markets,Markets and Market Access