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RISS 인기검색어
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- 저자 : Shamardin, Y.V. (검색결과 3 건)
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A provably tight delay-driven concurrently congestion mitigating global routing algorithm
Samanta, R.,Erzin, A.I.,Raha, S.,Shamardin, Y.V.,Takhonov, I.I.,Zalyubovskiy, V.V. Elsevier [etc.] 2015 Applied mathematics and computation Vol.255 No.-
Routing is a very important step in VLSI physical design. A set of nets are routed under delay and resource constraints in multi-net global routing. In this paper a delay-driven congestion-aware global routing algorithm is developed, which is a heuristic based method to solve a multi-objective NP-hard optimization problem. The proposed delay-driven Steiner tree construction method is of O(n<SUP>2</SUP>logn) complexity, where n is the number of terminal points and it provides n-approximation solution of the critical time minimization problem for a certain class of grid graphs. The existing timing-driven method (Hu and Sapatnekar, 2002) has a complexity O(n<SUP>4</SUP>) and is implemented on nets with small number of sinks. Next we propose a FPTAS Gradient algorithm for minimizing the total overflow. This is a concurrent approach considering all the nets simultaneously contrary to the existing approaches of sequential rip-up and reroute. The algorithms are implemented on ISPD98 derived benchmarks and the drastic reduction of overflow is observed.
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Rutile to anatase phase transition in TiO2:Nb thin films by annealing in H2 atmosphere
T. Potlog,M. Dobromir,D. Luca,P. Onufrijevs,A. Medvids,A. Shamardin 한국물리학회 2016 Current Applied Physics Vol.16 No.8
Rutile to anatase phase transition in Nb-doped thin films grown by RF magnetron sputtering method, annealed in H2 atmosphere at 460 C for 30 min using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-VIS spectroscopy and Raman analysis was found. XRD study reveals transformation of rutile fraction phase presented in mixed structure of Nb:TiO2 thin films before annealing in H2 environment to anatase and increases the crystallites size from 21 nm to 32 nm. The UV-VIS spectroscopy shows that the optical band gap of the films increases as the Nb concentration increases. Moreover, annealing in H2 additionally increases the band gap. The increase of the optical band gap of the films is explained by the presence of both anatase phase and Nb2O5 inclusions as shown by analysis of Raman spectra.
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Prolongation of the BOR-60 reactor operation
ALEXEY L. IZHUTOV,YURI M. KRASHENINNIKOV,IGOR Y. ZHEMKOV,ARTEM V. VARIVTSEV,YURI V. NABOISHCHIKOV,VICTOR S. NEUSTROEV,VALENTIN K. SHAMARDIN 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.3
The fast neutron reactor BOR-60 is one of the key experimental facilities worldwide to perform large-scale tests of fuel, absorbing, and structural materials for advanced reactors. The BOR-60 reactor was put into operation in December 1969, and by the end of 2014 it had been operating on power for ∼265,000 hours. BOR-60 still demonstrates potential capabilities to extend the lifetime of sodium-cooled fast reactors. The BOR-60 lifetime should have expired at the end of 2014. Over the past few years, a great scope of work has been performed to justify the possibility of extending its lifetime. The work included inspection of the equipment conditions, calculations and experimental research on operating parameters and the conditions of nonremovable components, investigation of the structural material samples after their long-term operation under irradiation, etc. Based on the results of the work performed, the residual lifetime was evaluated and the reactor operator made a decision to extend the lifetime period of the BOR-60 reactor. After considering both a set of documents about the reactor conditions and the positive decision of independent experts, the Regulatory Authority of the Russian Federation extended the BOR-60 operating license up to 2020.
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