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FAST LANE FOR TELECOMMUNICATION VLSI CIRCUIT DESIGN
Adams, J.,Sevenhans, J.,Guebels, P. 대한전자공학회 1989 ICVC : International Conference on VLSI and CAD Vol.1 No.1
Three design approaches for implementing telecommunication VLSI circuits in a fast and still cost effective way are discussed the core processor methodology, the application oriented processor architecture and the true silicon compilation. The most important trade-off arguments to be considered are development cost, development speed ind practical system constraints on power and size.
Global polarization of Λ hyperons in Au + Au collisions at sNN=200 GeV
Adam, J.,Adamczyk, L.,Adams, J. R.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Ajitanand, N. N.,Alekseev, I.,Anderson, D. M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Ashraf, American Physical Society 2018 Physical Review C Vol.98 No.1
Correlation measurements between flow harmonics in Au+Au collisions at RHIC
Adam, J.,Adamczyk, L.,Adams, J.R.,Adkins, J.K.,Agakishiev, G.,Aggarwal, M.M.,Ahammed, Z.,Ajitanand, N.N.,Alekseev, I.,Anderson, D.M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E.C.,Ashraf, M.U.,A North-Holland Pub. Co 2018 Physics letters. Section B Vol.783 No.-
<P><B>Abstract</B></P> <P>Flow harmonics ( <SUB> v n </SUB> ) in the Fourier expansion of the azimuthal distribution of particles are widely used to quantify the anisotropy in particle emission in high-energy heavy-ion collisions. The symmetric cumulants, S C ( m , n ) , are used to measure the correlations between different orders of flow harmonics. These correlations are used to constrain the initial conditions and the transport properties of the medium in theoretical models. In this Letter, we present the first measurements of the four-particle symmetric cumulants in Au+Au collisions at <SUB> s N N </SUB> = 39 and 200 GeV from data collected by the STAR experiment at RHIC. We observe that <SUB> v 2 </SUB> and <SUB> v 3 </SUB> are anti-correlated in all centrality intervals with similar correlation strengths from 39 GeV Au+Au to 2.76 TeV Pb+Pb (measured by the ALICE experiment). The <SUB> v 2 </SUB> – <SUB> v 4 </SUB> correlation seems to be stronger at 39 GeV than at higher collision energies. The initial-stage anti-correlations between second and third order eccentricities are sufficient to describe the measured correlations between <SUB> v 2 </SUB> and <SUB> v 3 </SUB> . The best description of <SUB> v 2 </SUB> – <SUB> v 4 </SUB> correlations at <SUB> s N N </SUB> = 200 GeV is obtained with inclusion of the system's nonlinear response to initial eccentricities accompanied by the viscous effect with η / s > 0.08 . Theoretical calculations using different initial conditions, equations of state and viscous coefficients need to be further explored to extract η / s of the medium created at RHIC.</P>
Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions
Adam, J.,Adamczyk, L.,Adams, J.R.,Adkins, J.K.,Agakishiev, G.,Aggarwal, M.M.,Ahammed, Z.,Ajitanand, N.N.,Alekseev, I.,Anderson, D.M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E.C.,Ashraf, M.U.,A North-Holland Pub. Co 2018 Physics letters. Section B Vol.784 No.-
<P><B>Abstract</B></P> <P>New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient <SUB> v 1 </SUB> , are presented for transverse momenta <SUB> p T </SUB> , and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range <SUB> s N N </SUB> = 7.7 – 200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on <SUB> s N N </SUB> , centrality and <SUB> p T </SUB> are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and <SUB> p T </SUB> dependencies of v 1 even , as well as an observed similarity between its excitation function and that for <SUB> v 3 </SUB> , could serve as constraints for initial-state models. The v 1 even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.</P>
Adam, J.,Adamczyk, L.,Adams, J.R.,Adkins, J.K.,Agakishiev, G.,Aggarwal, M.M.,Ahammed, Z.,Ajitanand, N.N.,Alekseev, I.,Anderson, D.M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E.C.,Ashraf, M.U.,A North-Holland Pub. Co 2018 Physics letters. Section B Vol.786 No.-
<P><B>Abstract</B></P> <P>We present a measurement of inclusive J / ψ production at mid-rapidity ( | y | < 1 ) in p + p collisions at a center-of-mass energy of s = 200 GeV with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The differential production cross section for J / ψ as a function of transverse momentum ( <SUB> p T </SUB> ) for 0 < <SUB> p T </SUB> < 14 GeV / c and the total cross section are reported and compared to calculations from the color evaporation model and the non-relativistic Quantum Chromodynamics model. The dependence of J / ψ relative yields in three <SUB> p T </SUB> intervals on charged-particle multiplicity at mid-rapidity is measured for the first time in p + p collisions at s = 200 GeV and compared with that measured at s = 7 TeV, PYTHIA8 and EPOS3 Monte Carlo generators, and the Percolation model prediction.</P>
Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies
Adam, J.,Adamczyk, L.,Adams, J. R.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Alekseev, I.,Anderson, D. M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Ashraf, M. U.,Atetalla, F American Physical Society 2019 Physical review letters Vol.122 No.17
해외 칼럼 - 원자력이 2018년에 반등하는 5가지 이유
Adams, Jarret 한국원자력산업회의 2018 원자력산업 Vol.38 No.4
원자력에너지는 최근 몇 년간 여러 가지 요인으로 인해 많은 어려움을 겪어 왔다. 천연가스 가격의 하락, 신재생 에너지의 보급 확대를 위한 국가 보조금 지급, 그리고 일부 지역에서의 전력 수요 둔화 등과 같은 요인으로 인해 원자력 발전의 경쟁력은 상당히 약화된 것이 사실이다. 그러나 최근 들어 그와 같은 상황이 바뀌고 있는 강력한 징후들이 곳곳에서 발견되고 있다. 올해 원자력 발전은 지난 몇 년간의 어려움에서 벗어나 새롭게 부활할 것이다.
An evaluation of the exposure in nadir observation of the JEM-EUSO mission
Adams, J.H.,Ahmad, S.,Albert, J.N.,Allard, D.,Ambrosio, M.,Anchordoqui, L.,Anzalone, A.,Arai, Y.,Aramo, C.,Asano, K.,Ave, M.,Barrillon, P.,Batsch, T.,Bayer, J.,Belenguer, T.,Bellotti, R.,Berlind, A.A. North-Holland ; Elsevier Science Ltd 2013 Astroparticle physics Vol.44 No.-
We evaluate the exposure during nadir observations with JEM-EUSO, the Extreme Universe Space Observatory, on-board the Japanese Experiment Module of the International Space Station. Designed as a mission to explore the extreme energy Universe from space, JEM-EUSO will monitor the Earth's nighttime atmosphere to record the ultraviolet light from tracks generated by extensive air showers initiated by ultra-high energy cosmic rays. In the present work, we discuss the particularities of space-based observation and we compute the annual exposure in nadir observation. The results are based on studies of the expected trigger aperture and observational duty cycle, as well as, on the investigations of the effects of clouds and different types of background light. We show that the annual exposure is about one order of magnitude higher than those of the presently operating ground-based observatories.