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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.
Evaluation of Voltage Control Effect for Data Acquisition Period Length from SCADA with IT Switches
Udagawa, Tsuyoshi,Yasuhiro, Hayashi,Takahashi, Naoyuki,Matsuura, Yasuo,Morita, Tomohiko,Minami, Masahiro The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.2
Measured data from IT switches are utilized in order to control voltage in Japanese distribution systems with photovoltaic generation systems. However, length of period from the data measurement to the data acquisition from IT switches by SCADA affects voltage control ability in a distribution automation system. In this paper, the effect of the length of the data acquisition period for voltage control by LRT and SVR is evaluated through numerical simulations in a distribution system model. Furthermore, the optimal length of the data acquisition period is determined according to PV penetration rate.
Iwahori, Yutaka,Ishikawa, Takashi,Watanabe, Naoyuki,Ito, Akira,Hayashi, Yoichi,Sugimoto, Sunao The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2
Experimental investigations of interlaminar mechanical properties for carbon fiber reinforced plastic (CFRP) laminates were carried out using aramid fiber ($Kevlar^{(R)}$-29 1000d) and carbon fiber (TR40-1K 612d, Mitsubishi Rayon) stitching. Various carbon fiber (CF) stitch densities were used to prepare a number of CF stitched CFRP laminates for double cantilever beam (DCB) tests. An insert tongue-type loading fixture, developed by the Japan Aerospace Exploration Agency (formerly the National Aerospace Laboratory of Japan), was also employed in the DCB test. Interlaminar tension tests were carried out under an out-of-plane directional loading using a single CF stitch thread in the CFRP laminates. The DCB test results clarified that the relationship between the volume fractions of the CF stitch thread ($V_{ft}$) and mode I critical energy release rate ($G_{Ic}$) showed a mostly linear function with a higher gradient than that of the $Kevlar^{(R)}$ stitched CFRP laminates. The CF stitched CFRP tension test results indicated that the consumption energy per unit area ($E_i$) was larger than that of $Kevlar^{(R)}$ stitched CFRP laminates.