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Analysis of Local Vibrations in the Stay Cables of the Hizen-Takashima Bridge
Kazuo Takahashi,Kensuke Tanaka,Shozo Nakamura 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed. Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed.
A Self-Adaptive Measurement Rate Control Method for an Agent-based Service Monitoring System
Satoshi Kondoh,Kensuke Takahashi,Masaru Sakai 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
The increasing complexity of services of telecommunications carriers has increased the burden of operators monitoring these services and the load on the system monitoring the target devices. Operators need to choose appropriate monitoring settings for each component of the services, considering the properties of each component. In addition, whenever a component is added or changed, its monitoring settings need to be reconfigured. Furthermore, if operators configure incorrect monitoring settings, service anomalies may not be detected, or quality of service may be damaged. Therefore, the monitoring system needs to automatically input and change the monitoring settings in accordance with the service. In this paper, we propose a method to dynamically adjust the monitoring interval for a monitoring system. Finally, evaluation results show the proposed method can reduce the monitoring overhead more effectively than the previous method and can also ensure the accuracy of monitoring when a service abnormality occurs.
Sho Kanemaru,Tomoki Ikegaya,Kensuke Takahashi,Tsuyoshi Toyoshima 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
The Business-to-Business-to-X (B2B2X) model has increased the importance of orchestrators that build and operate services that consists of various wholesale services. To develop RESTful API-based services, service providers need to catch up on the specifications of new wholesale services and specification changes of existing services quickly and inexpensively. Therefore, it is important to develop software called an API adapter that absorbs API differences from various services quickly and inexpensively. In this paper, we propose a method for comprehensively automating testing of not only C-Plane signals such as service provisioning/change/abolishment but also U-Plane signals such as communication between user devices and servers. We implemented our proposal using open source software and found that it improved test efficiency in an actual software development project.
The Aqua-Planet Experiment (APE): CONTROL SST Simulation
BLACKBURN, Michael,WILLIAMSON, David L.,NAKAJIMA, Kensuke,OHFUCHI, Wataru,TAKAHASHI, Yoshiyuki O.,HAYASHI, Yoshi-Yuki,NAKAMURA, Hisashi,ISHIWATARI, Masaki,McGREGOR, John L.,BORTH, Hartmut,WIRTH, Volkm Meteorological Society of Japan 2013 Journal of the Meteorological Society of Japan Vol.a91 No.-
The Aqua-Planet Experiment (APE): Response to Changed Meridional SST Profile
WILLIAMSON, David L.,BLACKBURN, Michael,NAKAJIMA, Kensuke,OHFUCHI, Wataru,TAKAHASHI, Yoshiyuki O.,HAYASHI, Yoshi-Yuki,NAKAMURA, Hisashi,ISHIWATARI, Masaki,McGREGOR, John L.,BORTH, Hartmut,WIRTH, Volkm Meteorological Society of Japan 2013 Journal of the Meteorological Society of Japan Vol.a91 No.-
Kenko Tanaka,Irena Sailer,Ryosuke Iwama,Kensuke Yamauchi,Shinnosuke Nogami,Nobuhiro Yoda,Tetsu Takahashi 대한치주과학회 2018 Journal of Periodontal & Implant Science Vol.48 No.6
Purpose: It has been suggested that resonance frequency analysis (RFA) can measure changes in the stability of dental implants during osseointegration. This retrospective study aimed to evaluate dental implant stability at the time of surgery (primary stability; PS) and secondary stability (SS) after ossseointegration using RFA, and to investigate the relationship between implant stability and cortical bone thickness. Methods: In total, 113 patients who attended the Tohoku University Hospital Dental Implant Center were included in this study. A total of 229 implants were placed in either the mandibular region (n=118) or the maxilla region (n=111), with bone augmentation procedures used in some cases. RFA was performed in 3 directions, and the lowest value was recorded. The preoperative thickness of cortical bone at the site of implant insertion was measured digitally using computed tomography, excluding cases of bone grafts and immediate implant placements. Results: The mean implant stability quotient (ISQ) was 69.34±9.43 for PS and 75.99±6.23 for SS. The mandibular group had significantly higher mean ISQ values than the maxillary group for both PS and SS (P<0.01). A significant difference was found in the mean ISQ values for PS between 1-stage and 2-stage surgery (P<0.5). The mean ISQ values in the non-augmentation group were higher than in the augmentation group for both PS and SS (P<0.01). A weak positive correlation was observed between cortical bone thickness and implant stability for both PS and SS in all cases (P<0.01). Conclusions: Based on the present study, the ISQ may be affected by implant position site, the use of a bone graft, and cortical bone thickness before implant therapy
Tanaka, Kenko,Sailer, Irena,Iwama, Ryosuke,Yamauchi, Kensuke,Nogami, Shinnosuke,Yoda, Nobuhiro,Takahashi, Tetsu Korean Academy of Periodontology 2018 Journal of Periodontal & Implant Science Vol.48 No.6
Purpose: It has been suggested that resonance frequency analysis (RFA) can measure changes in the stability of dental implants during osseointegration. This retrospective study aimed to evaluate dental implant stability at the time of surgery (primary stability; PS) and secondary stability (SS) after ossseointegration using RFA, and to investigate the relationship between implant stability and cortical bone thickness. Methods: In total, 113 patients who attended the Tohoku University Hospital Dental Implant Center were included in this study. A total of 229 implants were placed in either the mandibular region (n=118) or the maxilla region (n=111), with bone augmentation procedures used in some cases. RFA was performed in 3 directions, and the lowest value was recorded. The preoperative thickness of cortical bone at the site of implant insertion was measured digitally using computed tomography, excluding cases of bone grafts and immediate implant placements. Results: The mean implant stability quotient (ISQ) was $69.34{\pm}9.43$ for PS and $75.99{\pm}6.23$ for SS. The mandibular group had significantly higher mean ISQ values than the maxillary group for both PS and SS (P<0.01). A significant difference was found in the mean ISQ values for PS between 1-stage and 2-stage surgery (P<0.5). The mean ISQ values in the non-augmentation group were higher than in the augmentation group for both PS and SS (P<0.01). A weak positive correlation was observed between cortical bone thickness and implant stability for both PS and SS in all cases (P<0.01). Conclusions: Based on the present study, the ISQ may be affected by implant position site, the use of a bone graft, and cortical bone thickness before implant therapy.