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排序方式: 共有1296条查询结果,搜索用时 15 毫秒
21.
A survey and taxonomy on energy efficient resource allocation techniques for cloud computing systems
Abdul Hameed Alireza Khoshkbarforoushha Rajiv Ranjan Prem Prakash Jayaraman Joanna Kolodziej Pavan Balaji Sherali Zeadally Qutaibah Marwan Malluhi Nikos Tziritas Abhinav Vishnu Samee U. Khan Albert Zomaya 《Computing》2016,98(7):751-774
In a cloud computing paradigm, energy efficient allocation of different virtualized ICT resources (servers, storage disks, and networks, and the like) is a complex problem due to the presence of heterogeneous application (e.g., content delivery networks, MapReduce, web applications, and the like) workloads having contentious allocation requirements in terms of ICT resource capacities (e.g., network bandwidth, processing speed, response time, etc.). Several recent papers have tried to address the issue of improving energy efficiency in allocating cloud resources to applications with varying degree of success. However, to the best of our knowledge there is no published literature on this subject that clearly articulates the research problem and provides research taxonomy for succinct classification of existing techniques. Hence, the main aim of this paper is to identify open challenges associated with energy efficient resource allocation. In this regard, the study, first, outlines the problem and existing hardware and software-based techniques available for this purpose. Furthermore, available techniques already presented in the literature are summarized based on the energy-efficient research dimension taxonomy. The advantages and disadvantages of the existing techniques are comprehensively analyzed against the proposed research dimension taxonomy namely: resource adaption policy, objective function, allocation method, allocation operation, and interoperability. 相似文献
22.
We study the problem of guaranteeing correct execution semantics in parallel implementations of logic programming languages in presence of built-in constructs that are sensitive to order
of execution. The declarative semantics of logic programming languages permit execution of various goals in any arbitrary
order (including in parallel). However, goals corresponding to extra-logical built-in constructs should respect the sequential
order of execution to ensure correct semantics. Ensuring this correctness in presence of such built-in constructs, while efficiently
exploiting maximum parallelism, is a difficult problem. In this paper, we propose a formalization of this problem in terms
of operations on dynamic trees. This abstraction enables us to: (i) show that existing schemes to handle order-sensitive computations used in current parallel
systems are sub-optimal; (ii) develop a novel, optimal scheme to handle order-sensitive goals that requires only a constant time overhead per operation. While we present our results in the context of logic programming, they will apply equally well to
most parallel non-deterministic systems.
Received: 20 April 1998 / 3 April 2000 相似文献
23.
Dash RK Somersalo E Cabrera ME Calvetti D 《Computer methods and programs in biomedicine》2007,85(3):247-256
The reconstruction of an unknown input function from noisy measurements in a biological system is an ill-posed inverse problem. Any computational algorithm for its solution must use some kind of regularization technique to neutralize the disastrous effects of amplified noise components on the computed solution. In this paper, following a hierarchical Bayesian statistical inversion approach, we seek estimates for the input function and regularization parameter (hyperparameter) that maximize the posterior probability density function. We solve the maximization problem simultaneously for all unknowns, hyperparameter included, by a suitably chosen quasi-Newton method. The optimization approach is compared to the sampling-based Bayesian approach. We demonstrate the efficiency and robustness of the deconvolution algorithm by applying it to reconstructing the time courses of mitochondrial oxygen consumption during muscle state transitions (e.g., from resting state to contraction and recovery), from the simulated noisy output of oxygen concentration dynamics on the muscle surface. The model of oxygen transport and metabolism in skeletal muscle assumes an in vitro cylindrical structure of the muscle in which the oxygen from the surrounding oxygenated solution diffuses into the muscle and is then consumed by the muscle mitochondria. The algorithm can be applied to other deconvolution problems by suitably replacing the forward model of the system. 相似文献
24.
Gediminas Adomavicius Jesse C. Bockstedt Alok Gupta Robert J. Kauffman 《Information Technology and Management》2007,8(2):185-202
We propose a new conceptual model for understanding technology evolution that highlights dynamic and highly interdependent
relationships among multiple technologies. We argue that, instead of considering technologies in isolation, technology evolution
is best viewed as a dynamic system or ecosystem that includes a variety of interrelated technologies. By considering the interdependent nature of technology evolution, we
identify three roles that technologies play within a technology ecosystem. These roles are components, products and applications, and support and infrastructure. Technologies within an ecosystem interact through these roles and impact each others’ evolution. We also classify types
of interactions between technology roles, which we term paths of influence. We demonstrate the use of our proposed model through examples of wireless networking (Wi-Fi) technologies and a business
mini-case on the digital music industry.
相似文献
Robert J. KauffmanEmail: |
25.
In this paper we explore and analyze the structure of Internet auctions from an analytical and an empirical perspective. Such
web‐based auctions are rapidly emerging as a mercantile process of choice in the electronic marketplace. We observe current
Internet auctions for one‐time products, such as rapidly aging hardware, and analyze them within the framework of the existing
auction theory. While traditional auction theory focuses on single‐item auctions, we observe that a majority of on‐line auctions
are multi‐item auctions. A significant contribution of this work is the theoretical derivation of the structure of the winning
bids in multi‐item progressive on‐line auctions. Additionally, for comparative purposes, we explore the structural characteristics
of alternative multi‐item auction mechanisms proposed in the auction theory. We derive hypotheses based on our analytical
results and compare two different types of auction mechanisms. We test the traditional auction theory assumption regarding
the homogeneity of bidders and present the first ever empirically derived classification and performance‐comparison of on‐line
bidders. We test our hypotheses using real‐world empirical data obtained by tracking a premier web‐based auction site. Statistical
analysis of the data indicates that firms may gain by choosing alternative auction mechanisms. We also provide directions
for further exploration of this emerging but important dimension of electronic commerce.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
26.
This paper addresses the problem of target coverage for wireless sensor networks, where the sensing range of sensors can vary, thereby saving energy when only close targets need to be monitored. Two versions of this problem are addressed. In the first version, sensing ranges are supposed to be continuously adjustable (up to the maximum sensing range). In the second version, sensing ranges have to be chosen among a set of predefined values common to all sensors. An exact approach based on a column generation algorithm is proposed for solving these problems. The use of a genetic algorithm within the column generation scheme significantly decreases computation time, which results in an efficient exact approach. 相似文献
27.
Purnendu Parhi Satya Sadhan Singh Alok R. Ray A. Ramanan 《Bulletin of Materials Science》2006,29(2):115-118
This communication reports a novel mechanochemically assisted room temperature solid state metathesis reaction for the synthesis
of submicron-size alkaline-earth molybdates crystallizing in a tetragonal Scheelite structure. The solids were characterized
by powder XRD, FTIR, TGA, DTA, SEM, EDAX and TEM to ascertain their composition, phase homogeneity and morphology. 相似文献
28.
Raman scattering and photoluminescence (PL) measurements on (100) oriented n-type crystalline silicon (c-Si) and porous silicon
(PS) samples were carried out. PS samples were prepared by anodic etching of c-Si under the illumination of light for different
etching times of 30, 60 and 90 min. Raman scattering from the optical phonon in PS showed the redshift of the phonon frequency,
broadening and increased asymmetry of the Raman mode on increasing the etching time. Using the phonon confinement model, the
average diameter of Si nanocrystallites has been estimated as 2.9, 2.6 and 2.3 nm for 30, 60 and 90 min samples, respectively.
Similar size of Si crystallites has been confirmed from the high resolution transmission electron microscopy (HRTEM). Using
2TO phonon mode intensity, we conjectured that the disordered Si region around the pores present in 30 min PS dissolved on
etching for 90 min. The photoluminescence (PL) from PS increased in intensity and blue shifted with etching time from 2.1–2.3
eV. Blue shifting of PL is consistent with quantum confinement of electron in Si nanocrystallites and their sizes are estimated
as 2.4, 2.3 and 2.1 nm for 30, 60 and 90 min PS, respectively which are smaller than the Raman estimated sizes due to temperature
effect. Unambiguous dominance of quantum confinement effect is reported in these PS samples. 相似文献
29.
Design and analysis of a video-on-demand server 总被引:6,自引:0,他引:6
The availability of high-speed networks, fast computers and improved storage technology is stimulating interest in the development
of video on-demand services that provide facilities similar to a video cassette player (VCP). In this paper, we present a
design of a video-on-demand (VOD) server, capable of supporting a large number of video requests with complete functionality
of a remote control (as used in VCPs), for each request. In the proposed design, we have used an interleaved storage method
with constrained allocation of video and audio blocks on the disk to provide continuous retrieval. Our storage scheme interleaves
a movie with itself (while satisfying the constraints on video and audio block allocation. This approach minimizes the starting delay and the
buffer requirement at the user end, while ensuring a jitter-free display for every request. In order to minimize the starting
delay and to support more non-concurrent requests, we have proposed the use of multiple disks for the same movie. Since a
disk needs to hold only one movie, an array of inexpensive disks can be used, which reduces the overall cost of the proposed
system. A scheme supported by our disk storage method to provide all the functions of a remote control such as “fast-forwarding”,
“rewinding” (with play “on” or “off”), “pause” and “play” has also been discussed. This scheme handles a user request independent
of others and satisfies it without degrading the quality of service to other users. The server design presented in this paper
achieves the multiple goals of high disk utilization, global buffer optimization, cost-effectiveness and high-quality service
to the users. 相似文献
30.
We study the relation between the stability of a competitive equilibrium (CE)and the price adjustment mechanism used to attain that equilibrium point.Using two specific examples, a three-commodity exchange economy with a uniquecompetitive equilibrium (Scarf's global instability example) and atwo-commodity, two-trader type exchange economy with multiple competitiveequilibria, we show that the stability of a CE depends critically upon thedynamics of the price adjustment mechanism. A particular CE may be unstableunder one price adjustment mechanism but stable under another. The jointdynamics of the chosen price adjustment mechanism and the given economydetermines the overall stability of its competitive equilibrium. Our resultssuggest that context-rich studies of economic systems which focus on aspecific price adjustment mechanism may provide insights into the dynamics andstability of economic systems that are often not revealed through acontext-independent analysis. 相似文献