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Topology Discovery for Telecommunications-carrier Networks using Equipment Alarms
Atsushi Takada,Naoki Hayashi,Mizuto Nakamura,Naoyuki Tanji,Toshihiko Seki,Kyoko Yamagoe 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
As for the service assurance operation of telecommunications carriers, accurate information about a network topology which indicates the connection relationships between pieces of network equipment is necessary. However, the network of a telecommunications carrier has several hundreds of thousands of equipment, and its topology is frequently supplemented and modified due to daily construction work and troubleshooting. It is a therefore a problem when incorrect topology information is mixed into the overall topology information. In this paper, we propose a method that can discover the topology between equipment by using alarm information issued by those equipment during construction work or when a failure occurs. The proposed method was evaluated using alarm information generated under in certain commercial configurations (sections containing specific routers), and it was confirmed that the current topology could be discovered with 100% accuracy, even though only 1.7% of the total topology was evaluated in one day.
Tautomeric Structure of 1-Methyldihydropyridazino[3,4-b]quinoxalines in Solution
Kurasawa, Yoshihisa,Takada, Atsushi,Kim, Ho Sik,Okamoto, Yoshihisa 대구효성가톨릭대학교 자연과학연구소 1993 基礎科學硏究論集 Vol.1993 No.1
The reaction of 6-chloro-2-(1-methylhydrazino)quinoxaline 4-oxide 1 with ethyl 2-ethoxymethylene-2-cyano-acetate or ethoxymethylenemalononitrile gave 6-chloro-2-[2-{2-cyano-2-ethoxycarbonylvinyl)-1-methylhy-drazino]quinoxaline 4-oxide 3a or 6-chloro-2-[2-(2,2-dicyanovinyl)-1-methylhydrazino]quinoxaline 3b, respec-tively. The reaction of 3a with a base afforded 7-chloro-1-methyl-1,5-dihydropyridazino[3,4-b]quinoxaline 4. From the NOE spectral data, the 1-methyldihydropyridazino[3,4-b]quinoxalines 2a,2b and 4 were found to exist as the 1,5-dihydro from in a dimethyl sulfoxide or trifluoroacetic acid/dimethyl sulfoxide solution.
Kurasawa, Yoshihisa,Hosaka, Tomoyoshi,Takada, Atsushi,Kim, Ho Sik,Okamoto, Yoshihisa 대구효성가톨릭대학교 자연과학연구소 1994 基礎科學硏究論集 Vol.1994 No.1
The 3-(arylhydrazono)methyl-2-oxo-1,2-dihydroquinoxalines 1a-e and 2a-ishowed tautomeric equilib-ria between the hydrazone imine A and diazenyl enamine B forms in dimethyl sulfoxide media. The sub-stituent effects on the tautomer ratios of A to B in compounds 1a-e and 2a-i were studied by the nmr spec-troscopy. The electron-donating or electron-withdrawing p-substituents R^1 in compounds 2a-i representeda tendency to increase the ratios of the tautomer A or the tautomer B. respectively, exhibiting the linearcorrelation of the Hammett constants δ_p (-0.17 to +078) with the tautomer ratios of A to B or the tau-tomeric equilibrium constants K_T. However, the presence of the ester group R^2 in compounds 1a-e induced the exclusive existence of the tautomer A regardless of the nature of the p-substituent R^1. In the tautomeric thermodynamic study, the elevating temperature increased the ratios of the hydrazone imine tautomer A in compounds 2a-i. The tautomeric thermodynamic parameters △G˚, △H˚ and △S˚were derived from the van't Hoff plots for compounds 2a,b,h,i, wherein the entropy term dominated the free-energy difference between the A and B tautomers.