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RISS 인기검색어
- 검색키워드
- 저자 : Toshihiko Hayashi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Verification and Mitigation of Seismic Failure in Concrete Piers under Near-field Earthquakes
Ikeda, Shoji,Hayashi, Kazuhiko,Naganuma, Toshihiko Earthquake Engineering Society of Korea 2007 한국지진공학회논문집 Vol.11 No.4
This paper verifies the difference of the seismic behavior and seismic damage of the neighboring two reinforced concrete piers damaged by the 1995 Hyogoken Nanbu earthquake. The two piers were almost the same size, carrying slightly different dead load, and were provided with the same reinforcement arrangement except the amount of longitudinal reinforcement at the bottom portion of the piers. The pier with more reinforcement was completely collapsed due to this near field earthquake by shear failure at the longitudinal reinforcement cut-off while the other was only damaged at the bottom by flexure even though the longitudinal reinforcement cut-off was also existed at the mid height of the pier. According to the results of the pseudo dynamic test, the seismic damage was recognized to be greatly dependent on the ground motion characteristics even though the employed ground motions had the same peak acceleration. The severe damage was observed when the test employed the seismic wave that had strong influence to the longer period range compared to the initial natural period of the pier. On the other hand, based on the similar model experiment, the defect of gas-pressure welded splice of longitudinal reinforcement was revealed to save the piers against collapse due to the so-called fail-safe mechanism contrary to the intuitive opinion of some researchers. It was concluded that the primary cause of the collapse of the pier was the extremely strong intensity and peculiar characteristics of the earthquake motion according to both the site-specific and the structure-specific effects.
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Verification and Mitigation of Seismic Failure in Concrete Piers under Near-field Earthquakes
Shoji Ikeda,Kazuhiko Hayashi,Toshihiko Naganuma 한국지진공학회 2007 한국지진공학회논문집 Vol.11 No.4
This paper verifies the difference of the seismic behavior and seismic damage of the neighboring two reinforced concrete piers damaged by the 1995 Hyogoken Nanbu earthquake. The two piers were almost the same size, carrying slightly different dead load, and were provided with the same reinforcement arrangement except the amount of longitudinal reinforcement at the bottom portion of the piers. The pier with more reinforcement was completely collapsed due to this near field earthquake by shear failure at the longitudinal reinforcement cut-off while the other was only damaged at the bottom by flexure even though the longitudinal reinforcement cut-off was also existed at the mid height of the pier. According to the results of the pseudo dynamic test, the seismic damage was recognized to be greatly dependent on the ground motion characteristics even though the employed ground motions had the same peak acceleration. The severe damage was observed when the test employed the seismic wave that had strong influence to the longer period range compared to the initial natural period of the pier. On the other hand, based on the similar model experiment, the defect of gas-pressure welded splice of longitudinal reinforcement was revealed to save the piers against collapse due to the so-called fail-safe mechanism contrary to the intuitive opinion of some researchers. It was concluded that the primary cause of the collapse of the pier was the extremely strong intensity and peculiar characteristics of the earthquake motion according to both the site-specific and the structure-specific effects.
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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.
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Timosaponin AIII induces apoptosis and autophagy in human melanoma A375-S2 cells
Ye Wang,Lei Xu,Li-Li Lou,Shao-Jiang Song,Guo-Dong Yao,Meng-Yao Ge,Toshihiko Hayashi,Shin-ichi Tashiro,Satoshi Onodera,Takashi Ikejima 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.1
Timosaponin AIII (AIII), a steroidal saponinisolated from Anemarrhena asphodeloides Bge. Our studyshowed that AIII induced both apoptosis and autophagy,and autophagy inhibited apoptosis in A375S2 cells. Furtherly,this study was carried out to investigate what kindof cytokines plays an important role in this process. Theresults revealed that AIII induced apoptosis through activatingc-Jun N-terminal protein kinase (JNK) or extracellularsignal related kinase (ERK) signaling pathway andgenerating NO. However, JNK or ERK inhibited autophagy,while NO had no effect on autophagy. Therefore,JNK, ERK or NO regulates two programmed death processesin different ways. AIII did not show obvious cytotoxiceffect on human peripheral blood mononuclear cells,which indicated that AIII has less side effects on normalcells, and could be considered as a leading compound fordeveloping novel anticancer drug.
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