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Search Results: 1 - 10 of 23032 matches for " REN Kai "
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CASO: Cost-Aware Secure Outsourcing of General Computational Problems
Kai Zhou,Jian Ren
Computer Science , 2015,
Abstract: Computation outsourcing is an integral part of cloud computing. It enables end-users to outsource their computational tasks to the cloud and utilize the shared cloud resources in a pay-per-use manner. However, once the tasks are outsourced, the end-users will lose control of their data, which may result in severe security issues especially when the data is sensitive. To address this problem, secure outsourcing mechanisms have been proposed to ensure security of the end-users' outsourced data. In this paper, we investigate outsourcing of general computational problems which constitute the mathematical basics for problems emerged from various fields such as engineering and finance. To be specific, we propose affine mapping based schemes for the problem transformation and outsourcing so that the cloud is unable to learn any key information from the transformed problem. Meanwhile, the overhead for the transformation is limited to an acceptable level compared to the computational savings introduced by the outsourcing itself. Furthermore, we develop cost-aware schemes to balance the trade-offs between end-users' various security demands and computational overhead. We also propose a verification scheme to ensure that the end-users will always receive a valid solution from the cloud. Our extensive complexity and security analysis show that our proposed Cost-Aware Secure Outsourcing (CASO) scheme is both practical and effective.
A Forward-Looking Nash Game and Its Application to Achieving Pareto-Efficient Optimization  [PDF]
Jie Ren, Kai-Kit Wong, Jianjun Hou
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.412218
Abstract:

Recognizing the fact that a player’s cognition plays a defining role in the resulting equilibrium of a game of competition, this paper provides the foundation for a Nash game with forward-looking players by presenting a formal definition of the Nash game with consideration of the players’ belief. We use a simple two-firm model to demonstrate its fundamental difference from the standard Nash and Stackelberg games. Then we show that the players’ belief functions can be regarded as the optimization parameters for directing the game towards a much more desirable equilibrium.

The Role of Dicer in DNA Damage Repair
Kai-Fu Tang,Hong Ren
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131216769
Abstract: Dicer is the key component of the RNA interference pathway. Our group and others have reported that knockdown or knockout of Dicer leads to DNA damage in mammalian cells. Two groups recently showed that efficiency of DNA damage repair was greatly reduced in Dicer-deficient cells and that Dicer-dependent small RNAs (~21 nucleotides) produced from the sequences in the vicinity of DNA double-strand break sites were essential for DNA damage repair. Moreover, accumulating data have suggested that miroRNAs play pivotal roles in DNA damage repair. In this review, we discuss the molecular mechanisms by which loss of Dicer leads to DNA damage, as well as the role of Dicer in tumorigenesis.
Screening and Preliminary Identification of Medicinal Plants Endophytic Actinomycetes Used for Inhibiting Penicillin-Resistant Staphylococcus aureus
Xiumin Zhang,Kai Ren,Liping Zhang
International Journal of Biology , 2012, DOI: 10.5539/ijb.v4n2p119
Abstract: 65 strains of endophytic actinomycetes were isolated from Achyranthes bidentata, Paeonia lactiflora, Radix Platycodi and Artemisiae argyi. Active strains of inhibiting penicillin-resistant staphylococcus aureus were screened from these strains and some were identified preliminarily. The results showed that 12 strains among these 65 strains of endophytic actinomycetes were able to suppress penicillin-resistant staphylococcus aureus. Through the observation on morphology of mycelium and phylogenetic analysis of 16S rDNA, a strain belongs to the genus Glycomyces and most other as the genus Streptomyces.
Power Allocation in Nonselfish Symbiotic Cognitive Relaying with Partial Channel State Information
Peng Gong,Kai Ren,Duk Kyung Kim
International Journal of Distributed Sensor Networks , 2014, DOI: 10.1155/2014/525062
Abstract: We first address the problem of power allocation at cognitive users (CUs) to maximize the throughput of a nonselfish symbiotic cognitive radio scheme, in which the CUs may assist the data transmission of primary users (PUs) via nonorthogonal amplify-and-forward (AF) cognitive relaying and obtain an incentive time for their own data transmission in a nonselfish manner. Then, an optimal power allocation algorithm is proposed based on the full channel state information (CSI) among PUs, CUs, and base station (BS). In order to reduce the feedback overhead, another power allocation algorithm is devised based only on the partial CSI, that is, the CSI of BS-PU and the CSI of BS-CUs. Simulation results demonstrate that, compared with the optimal power allocation algorithm, the power allocation algorithm with only the partial CSI can achieve a similar performance with a smaller channel feedback overhead. 1. Introduction With underutilized time or frequency resources, the Federal Communications Commission (FCC) has recommended that more efficient spectrum utilization could be realized by implementing devices that can coexist with licensed users or PUs [1]. In consequence, cognitive radio (CR) has been considered as an essential candidate for exploiting spectrum at a higher efficiency [2, 3]. Based on the original CR concept [2], the data transmission of a conventional cognitive radio scheme (CCR) [1] is performed as a passive approach. The CUs need to sense the spectrum and wait for spectrum holes for their data transmission without any interaction between primary and cognitive networks. In this case, there is no need for any modification in the primary network, but, instead, the achievable performance, for example, spectrum efficiency, is quite limited. The relay systems have been actively studied to increase the throughput as well as to increase the service coverage in wireless networks [4–6]. In order to further enhance the performance of the cognitive network, the relay function is actively enabled at the CUs to assist the primary transmission, which may bring the benefits to the CUs, for example, creating more spectrum holes for the cognitive network. As the CUs with relay function come into play, the optimal power allocation at CUs to increase the spectrum efficiency becomes a critical issue for coexisting primary and cognitive networks [7–13]. However, to efficiently utilize the spectrum holes created by cognitive relaying, some interaction between primary and cognitive networks is inevitable, despite that it may break the rule of original CR concept.
Localization of Wiener Functionals of Fractional Regularity and Applications
Kai He,Jiagang Ren,Hua Zhang
Mathematics , 2013,
Abstract: In this paper we localize some of Watanabe's results on fractional Wiener functionals, and use them to give a precise estimate of the difference between two Donsker's delta functionals even with fractional differentiability. As an application, the convergence rate of the density of the Euler scheme for non-Markovian stochastic differential equations is obtained.
Volatiles from Acer truncatum Flowers  [PDF]
Hongjian Ren, Fenfen Si, Meijing Ye, Qian Qiao, Kai An, Chao Wang, Zhen Feng
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.92019
Abstract: Plant volatile organic compounds (Biogenic Volatile Organic compounds, referred BVOCs) have a significant impact on the atmospheric environment, air quality and human health. This experiment takes Acer truncatum flowers as the research object, uses solid-phase micro-extraction combine GC-MS (SPME-GC-MS) to detect the main component of volatiles released by the flowers from 10 individual trees of Acer truncatum (Acer truncatum Bunge). The results showed that 37 kinds of volatiles were detected and they are belonged to four types organic compouds, such as terpenoids, alcohols, ketones, esters. According to the analysis of the main components of Acer truncatum flower volatiles includes Fluorene, 4,8 -Dimethyl-1,3 (E), 7-Nonene, (cis, trans)-2,6-Dimethyl-2,4,6-triene-Partenkirchen, Myrcene, Basil hexene, 3-Carene, (E)-Basil, Camphene, Caryophyllene, Linalool, α-Terpinolene, O-cymene, 3-Vinyl-1,2-dimethyl-1, Eucalyptus alcohols and Alcohol vinegar-12. However, there were no significant differences between individual trees in terms of obscure material O-cymene, Eucalyptus alcohols, Alcohol vinegar-12, as well as the significant differences in terms of remaining volatiles.
Color Sextet Scalars at the CERN Large Hadron Collider
Chen, Chuan-Ren;Klemm, William;Rentala, Vikram;Wang, Kai
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.79.054002
Abstract: Taking a phenomenological approach, we study a color sextet scalar at the LHC. We focus on the QCD production of a color sextet pair \Phi_6\bar{\Phi}_{6} through gg fusion and q\bar{q} annihilation. Its unique coupling to \bar{\psi^c}\psi allows the color sextet scalar to decay into same-sign diquark states, such as \Phi_6\to tt/tt^*. We propose a new reconstruction in the multijet plus same sign dilepton with missing transverse energy samples to search for on-shell tt\bar{t}\bar{t} final states from sextet scalar pair production. Thanks to the large QCD production, the search covers the sextet mass range up to 1 TeV for 100 fb^-1 integrated luminosity.
Trapped Surface Wave and Lateral Wave in the Presence of a Four-Layered Region
Yi Hui Xu;Wang Ren;Liang Liu;Kai Li
PIER , 2008, DOI: 10.2528/PIER08031802
Abstract: In this paper, propagation model considers the region as a perfect conductor, covered by the two layer dielectrics, and air above. Propagation of the electromagnetic field in the presence of a four-layered region is examined in detail when a vertical electric dipole and observation point are located in the air. Similar to the three-layered case, analytical results are found for the electromagnetic field, which includes four wave modes: a direct wave,an ideal reflected wave, trapped surface waves, and lateral waves. The wave number of the trapped surface wave, which is contributed by the sums of residues of the poles, is between the wave numbers in the air and in the lower dielectric layer. The lateral wave is evaluated by the integrations along the branch cut. Analysis and computations shows that the trapped surface wave play a major role in communication at large distance when both the source point and observation point are on or close to the boundary between the air and the upper dielectric layer.
Exact Transient Field of a Horizontal Electric Dipole Excited by a Gaussian Pulse on the Surface of One-Dimensionally Anisotropic Medium
Yin-Lin Wang;Wang Ren;Kai Li
PIER B , 2008, DOI: 10.2528/PIERB08062005
Abstract: In this paper,the propagation model considers the two half-spaces as a homogeneous isotropic medium and one-dimensionally anisotropic medium. From the exact formulas for the transient field with delta-function excitation,it is obtained readily the exact formulas for the transient field excited by a horizontal electric dipole with Gaussian excitation when both the dipole point and field point are located on the boundary between a homogeneous isotropic medium and one-dimensionally anisotropic medium. It is seen that the final exact formulas can be expressed in terms of several fundamental functions and finite integrals,which are evaluated easily.
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