Alan Sill

Alan Sill
Texas Tech University | TTU · High Performance Computing Center

Ph.D Physics, The American U.

About

635
Publications
690,175
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34,402
Citations

Publications

Publications (635)
Conference Paper
In recent years, considerable attention has been given to assessing the value of investments in cyberinfrastructure (CI). This paper focuses on assessment of value measured in ways other than financial benefits - what might well be termed impact or outcomes. This paper is a companion to a paper presented at the PEARC'19 conference, which focused on...
Conference Paper
In recent years, considerable attention has been given to assessing the value of investments in cyberinfrastructure (CI). This paper includes a survey of current methods for the assessment of financial returns on investment (ROI) in CI. Applying the financial concept of ROI proves challenging with regard to a service that, in most academic environm...
Article
Data centers should be among the most automated, robust environments on the planet. Instead, they often remain stuck in the past as agglomerations of outdated technologies. It is time to take this problem seriously and directly address the needs of data centers for modern automation and control through analytics-driven methods.
Conference Paper
Traditional management standards are often insufficient to manage modern data centers at large scale, which motivates the community to propose and develop new management standards. The most popular traditional standard for monitoring and controlling the health and functionality of a system at hardware layer is Intelligent Platform Management Interf...
Conference Paper
Data centers are at the core of modern software technology and play a crucial role in defining the capabilities and overall success of an organization. The massive growth in size and scale of data and computing leads to an enormous growth in the size and complexity of clusters and data centers. Therefore, traditional management methods and standard...
Article
This column has covered cloud native and related relevant standards since the inception of the magazine. Recent progress in this area has received additional impetus from participation by major organizations in the standards-based development process. A milestone in this proces s has been provided by Microsoft and AWS joining the Cloud Native Compu...
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Blockchain methods are emerging as practical tools for validation, record-keeping, and access control in addition to their early applications in cryptocurrency. This column explores the options for use of blockchains to enhance security, trust, and compliance in a variety of industry settings and explores the current state of blockchain standards.
Article
In this paper, we describe measurements of the response functions of a fiber-based dual- readout calorimeter for pions, protons and multiparticle "jets" with energies in the range from 10 to 180 GeV. The calorimeter uses lead as absorber material and has a total mass of 1350 kg. It is complemented by leakage counters made of scintillating plastic,...
Article
Cloud computing assumes communication among participating components. The boundary between the collection of these components and the world of humans and devices has acquired a set of names that encompass different concepts, including fog computing (implying a highly diffuse, distributed cloud), edge computing (implying a clean boundary between con...
Article
Recent cloud standards developments and relevant news on best practices and trends are discussed in this column. In addition, the column looks at how community-based development efforts play a crucial role in establishing the innovation that drives the methods of cloud computing, and in moving new technologies to adoption.
Article
Datacenter automation has entered the modern era through definition and standardization of underlying services. This column explores the basis for these trends in both modern and historical standards, and sets a direction for microservices deployment in datacenters.
Article
Microservices are sweeping through cloud design architectures, at once embodying new trends and making use of previous paradigms. This column explores the basis for these trends in both modern and historical standards, and sets out a direction for the future of microservices development.
Article
Automated and network-connected manufacturing techniques are now part of a larger landscape of interconnection that encompasses an increasingly broad range of activities. As in many previously isolated areas of specialized information technology, standards applicable to smart manufacturing must adapt to keep pace with the accelerating pace of chang...
Article
Clouds are intrinsically dependent on sophisticated approaches to networking. Automated methods to define, create, and control network functions are required to achieve the resilience, scalability, and flexibility expected of cloud services. This instance of the 'Standards Now' column explores and differentiates between a variety of modern techniqu...
Chapter
This chapter begins with the basis of standards, including when and where they are appropriate and why they are needed. After presenting a summary of the range and variety of standards and their issuing organizations to provide the reader with the necessary background, the fundamental features unique to cloud-computing standards are covered. Cloud...
Article
Cloud standards can be roadmaps to migration. Even when they do not give prescriptive formulas for what to do, their presence helps to map the territory for future innovation. This column summarizes recent activity by formal cloud standards developing organizations and by community-based groups such as the Cloud Standards Customer Council, the Open...
Article
The performance of the RD52 dual-readout calorimeter is measured for very small angles of incidence between the 20 GeV electron beam particles and the direction of the fibers that form the active elements of this calorimeter. The calorimeter response is observed to be independent of the angle of incidence for both the scintillating and the Čerenkov...
Article
Cloud standards are uniquely suited to crossing boundaries that occur in hybrid cloud deployments. This column presents several new efforts in this area and discusses their history and current state, along with related software projects.
Article
This column completes a two-part exploration into features of application programming interfaces (APIs) that are useful in clouds. The discussion contrasts APIs with other types of interfaces and describes variations on protocols and calling methods, giving examples from physical hardware control to illustrate important features of cloud API design...
Article
This column provides examples of data access patterns ranging from completely local user-driven methods to cloud-based tools to illustrate concepts related to application programmer interface (API) design, and the use and role of API concepts in cloud computing.
Article
This column reviews various methods for organizing standards development and gives current examples from recent developments in cloud computing.
Article
This column discusses factors that can lead to the emergence of standards, and explores features that can both limit their initial emergence and accelerate their subsequent uptake. The author describes conditions that tend to lead to monopolies versus the shared development and diversity that push communities toward standards. The main factor that...
Article
Keeping computing standards up with the pace of change in software and hardware development requires paying attention to methods by which such innovations are created, adopted, updated, and socialized within their target user communities. Significant changes are taking place in practice, led by work from individual contributors as well as formal an...
Article
Cloud computing in its present state more closely resembles a collection of individual parts than a single coherent whole; parts that can be assembled, for example, into a wide variety of products depending on the interests and resources of those choosing to do the assembly. A current challenge in cloud computing is that many of these larger constr...
Article
As cloud services increasingly become part of how we do business and solve problems in computing, it's becoming important to evaluate rigorously in real time the level of success of different approaches. This column explores the process of selecting cloud software and standards in modern deployment environments and calls out some important characte...
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Full-text available
The RD52 calorimeter uses the dual-readout principle to detect both electromagnetic and hadronic showers, as well as muons. Scintillation and Cherenkov light provide the two signals which, in combination, allow for superior hadronic performance. In this paper, we report on detailed, GEANT4 based Monte Carlo simulations of the performance of this in...
Article
Cloud computing methods can be classified in terms of APIs, protocols, languages, and tools. This article looks at the different types of cloud software components, and discusses the pros and cons of taking a development plus operations ("DevOps") approach to accelerate progress on software and standards.
Article
Organizations of varying shapes, types, and sizes play a variety of roles in motivating and developing cloud standards. Establishing community-driven, consensus-based international mutually agreed-upon standards in rapidly developing fields like cloud computing requires many such intermediate organizations to bridge communication gaps that would ot...
Article
When the author was in college, a member of the debate team once told him that the best method he had found so far to stop a successful argument by members of an opposing team was to ask them to define their terms. This always struck him as obscure and unproductive advice: after all, isn't the point of a useful debate not just tactics, but arriving...
Article
The ongoing process of defining, developing, and recognizing standards is intrinsically a community activity. As standards are developed and implemented in the emerging cloud computing landscape, the "Standards and Compliance" area will serve as a forum for describing not only the standards that are seeing use, but also the process by which they're...
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The RD52 dual-readout calorimeter is a longitudinally unsegmented instrument intended for the detection of both electromagnetically and hadronically interacting particles with unprecedented precision. In this paper, the identification of the showering particles and, in particular, the identification of electrons and γs with this instrument are inve...
Article
Full-text available
The RD52 calorimeter is an instrument intended to detect both electromagnetic and hadronic showers, as well as muons, using the dual-readout principle. Scintillation and Cherenkov light provide the two signals which, in combination, allow for superior halronic performance. In this paper, we report on the electromagnetic performance of this instrume...
Article
Full-text available
The RD52 Project at CERN is a pure instrumentation experiment whose goal is to understand the fundamental limitations to hadronic energy resolution, and other aspects of energy measurement, in high energy calorimeters. We have found that dual-readout calorimetry provides heretofore unprecedented information event-by-event for energy resolution, lin...
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A New Boson with a Mass of 125 GeV Observed with the CMS Experiment at the Large Hadron Collider; The CMS Collaboration; The Higgs boson was postulated nearly five decades ago within the framework of the standard model of particle physics and has been the subject of numerous searches at accelerators around the world. Its discovery would verify...
Article
Some high-Z scintillating crystals offer the possibility to distinguish the contributions from the scintillation and Cˇherenkov mechanisms to the generated signals. Among these crystals are BGO and PbWO4. We have tested matrices of these crystals as electromagnetic calorimeters and studied the properties of the Cˇherenkov and scintillation componen...
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Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC; Results are presented from searches for the standard model Higgs in proton-proton collisions at root s = 7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 fb(-1) at 7 TeV and 5....
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The inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities, are measured in the range of transverse momenta p T = 35-150 GeV/c in proton-proton collisions at $ \sqrt {s} = 7 $ TeV by the CMS experiment at the LHC. Forward jets are meas...
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Measurements of jet characteristics from inclusive jet production in protonproton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 pb−1. The mean charged-hadron multiplicity, the differential and integral jet sha...
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A search for neutral Higgs bosons decaying to tau pairs at a center-of-mass energy of 7 TeV is performed using a dataset corresponding to an integrated luminosity of 4.6 fb-1 recorded by the CMS experiment at the LHC. The search is sensitive to both the standard model Higgs boson and to the neutral Higgs bosons predicted by the minimal supersymmetr...
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Results are presented from a search for large, extra spatial dimensions in events with either two isolated muons or two isolated electrons. The data are from proton-proton interactions at root s = 7 TeV collected with the CMS detector at the LHC. The size of the data sample corresponds to an integrated luminosity of approximately 2 fb(-1). The obse...
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Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon–nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta (p T) and collision centrality over a broad range in relative pseudorapidity (Δη) a...
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A bstract Yields of prompt and non-prompt J/ ψ , as well as $ \Upsilon $ (1S) mesons, are measured by the CMS experiment via their μ ⁺ μ ⁻ decays in PbPb and pp collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV for quarkonium rapidity | y | < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and t...
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A search for quark compositeness using dijet angular distributions from pp collisions at s√=7 TeV is presented. The search has been carried out using a data sample corresponding to an integrated luminosity of 2.2 fb−1, recorded by the CMS experiment at the LHC. Normalized dijet angular distributions have been measured for dijet invariant masses fro...
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Yields of prompt and non-prompt J/ψ, as well as Y(1S) mesons, are measured by the CMS experiment via their μ μ decays in PbPb and pp collisions at √/s = 2.76 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum pT, as well as collision centrality....
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A measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at Ös = 0.9\sqrt{s} = 0.9TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a se...
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The production of b jets in association with a Z/γ* boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV and recorded by the CMS detector. The inclusive cross section for Z/γ* + b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 fb−1. The Z/γ* + b-jet cross s...
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A search for the standard model Higgs boson decaying into two Z bosons with subsequent decay into a final state containing two quark jets and two leptons, H -> ZZ((*)) -> q (q) over barl(-)l(+) is presented. Results are based on data corresponding to an integrated luminosity of 4.6 fb(-1) of proton-proton collisions at root s = 7TeV, collected with...
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A bstract A search for microscopic black holes in pp collisions at a center-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 4.7 fb ⁻¹ recorded by the CMS experiment at the LHC in 2011. Events with large total transverse energy have been analyzed for the presence of multiple energetic jets, leptons, a...
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A search for the standard model Higgs boson (H) decaying to bb¯ when produced in association with weak vector bosons (V) is reported for the following modes: W(μν)H, W(eν)H, Z(μμ)H, Z(ee)H and Z(νν)H. The search is performed in a data sample corresponding to an integrated luminosity of 4.7 fb-1, recorded by the CMS detector in proton-proton collisi...
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A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a center-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 fb-1. Limits are set on the cross section of the standard model Higgs boson decaying to tw...
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Isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |η|<1.44 and transverse energies ET between 20 and 80 GeV with the CMS detector at the LHC. The measured ET spectra are found to be in good agreement with next-to-leading-order perturbat...
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A search for the standard model Higgs boson decaying to W+W- in pp collisions at root s = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 fb(-1). The W+W- candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess...
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A search for signatures of extra spatial dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at √s=7 TeV corresponding to an integrated luminosity of 2.2 fb(-1). In the co...
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A search for a Higgs boson in the four-lepton decay channel H→ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range of 110<m(H)<600 GeV. The analysis uses data corresponding to an integrated luminosity of 4.7 fb(-1) recorded by the CMS detector in pp collisions at √s=7 Te...
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The difference in angular distributions between top quarks and antiquarks, commonly referred to as the charge asymmetry, is measured in pp collisions at the LHC with the CMS experiment. The data sample corresponds to an integrated luminosity of 1.09fb -1 at a centre-of-mass energy of 7 TeV. Top-quark pairs are selected in the final state with an el...
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Full-text available
A search for signatures of extra spatial dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at √s=7 TeV corresponding to an integrated luminosity of 2.2 fb(-1). In the co...
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Full-text available
A search for a Higgs boson in the four-lepton decay channel H to ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range 110 < mH < 600 GeV. The analysis uses data corresponding to an integrated luminosity of 4.7 inverse femtobarns recorded by the CMS detector in pp collisi...
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Search for the standard model Higgs boson in the H → ZZ → + − τ + τ − decay channel in pp collisions at √ s = 7 TeV The CMS collaboration Abstract: A search is reported for the standard model Higgs boson in the H → ZZ → + − τ + τ − decay mode, where = µ or e, in proton-proton collisions at √ s = 7 TeV, corresponding to an integrated luminosity of 4...
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A search for the standard model Higgs boson in the H -> ZZ -> 2l2v decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 fb(-1). No significant excess is observed above the background expectatio...
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Full-text available
Combined results are reported from searches for the standard model Higgs boson in proton-proton collisions at s=7 TeV in five Higgs boson decay modes: γγ, bb, ττ, WW, and ZZ. The explored Higgs boson mass range is 110-600 GeV. The analysed data correspond to an integrated luminosity of 4.6-4.8 fb-1. The expected excluded mass range in the absence o...
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The inclusive b-jet production cross section in pp collisions at a center-of mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18 < p T < 200 GeV for several rapidity intervals. The results are also given as the ratio of t...
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A measurement of the J/psi and psi(2S) production cross sections in pp collisions at root s = 7 TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 pb(-1). Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for promp...