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Real-time Monitoring System for Container Networks in the Era of Microservices
Naoki Oguchi,Yosuke Takano,Reiko Kondo,Masaaki Noro,Takashi Shiraishi 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Large-scale web services are increasingly adopting the microservice architecture that mainly utilizes container technologies. Microservices are operated on complex configured infrastructures, such as containers, virtual machines, and physical machines. To ensure service quality of microservices, it is important to monitor not only the quality of services but also the quality of the infrastructures utilized by the services. Therefore, the metrics of the infrastructure related with the services should be traced. An extended Berkeley Packet Filter (eBPF) is a relatively new Linux’s function, which is effectively used as a sensor of container-network metrics. There are two key challenges in realizing the service-linked monitoring system. One challenge is making the full-stack topology between microservices, containers, and machines visible to set the sensor related with the services. Another challenge is dynamic sensor management that can relocate the sensor quickly after the topology’s change. In this paper, we propose a real-time monitoring system that creates a full-stack topology and relocates the sensor in conjunction with events from a container orchestrator. The system enables a dynamic deployment of the sensors related with the monitored services.
Yoshikazu,Hwang Hae-Jin,Naoki Kondo,Tatsuki Ohji 한국분말야금학회 2001 한국분말야금학회지 Vol.8 No.3
A bulk porous composite with plantinum nano-dispersion was synthesized in air atmosphere through the combination of several in situ reactions, including the pyrolysis of . A mixture of (dolomite), , and LiF (0.5 wt%, as an additive) was cold isostatically pressed at 200 MPa and sintered at for 2 h. The porous composite ( : Pt=99 : 1 in volume) had a uniformly open-porous structure (porosity: 56%) with three-dimensional (3-D) network and a narrow pore-size distribution, similarly to the porous composites reported before. Catalytic Properties (viz., NO direct decomposition and NO reduction by ) of the composite were investigated up to . In the absence of oxygen, the NO conversion rate reached ~52% for the direct decomposition and ~100% for the reduction by , respectively. The results suggest the possibility of the porous composite as a multifunctional filter, i.e., simultaneous hot gas-filtering and in one component.
Ichikawa Shintaro,Oishi Naoki,Kondo Tetsuo,Onishi Hiroshi 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.9
There are various diseases of the gallbladder and cystic duct, and imaging diagnosis is challenging for the rare among them. However, some rare diseases show characteristic imaging findings or patient history; therefore, familiarity with the imaging presentation of rare diseases may improve diagnostic accuracy and patient management. The purpose of this article is to describe the imaging findings of rare diseases of the gallbladder and cystic duct and identify their pathological correlations with these diseases.
Comparison of water vapor corrosion mechanisms of polycrystalline and eutectic Lu2Si2O7
Shunkichi Ueno,D. Doni Jayaseelan,Tatsuki Ohji,Naoki Kondo,Shuzo Kanzaki 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2
To clarify the water vapor corrosion mechanism of the Lu2Si2O7 system, a high temperature water vapor corrosion test was performed on two microstructurally different specimens namely, polycrystalline and eutectic. From the results, we address the problem of the application of the Lu2Si2O7 system for environmental barrier coatings (EBC) with regard to their microstructure. In the case of the polycrystalline sample, the boundaries were easily corroded and the silicon nitride substrate underwent oxidation. In the case of the eutectic sample, no weight change was observed during the corrosion test. However, a trace of corrosion and poly-crystallization was observed on the sample surface. An easy processing technique for forming an eutectic protective layer on silicon nitride ceramics is also proposed.
DEVELOPMENT OF NEW STITCHING INTERFEROMETRY FOR THE SPICA TELESCOPE
Asa Yamanaka,HIDEHIRO KANEDA,MITSUYOSHI YAMAGISHI,TORU KONDO,Takuma Kokusho,Kotomi Tanaka,Misaki Hanaoka,TAKAO NAKAGAWA,Mitsunobu Kawada,Naoki Isobe,Toshiaki Arai,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
The telescope to be onboard SPICA (Space Infrared Telescope for Cosmology and Astrophysics) has an aperture diameter of 2.5 m and its imaging performance is to be diffraction-limited at a wavelength of 20 μm at the operating temperature of < 8 K. Because manufacturing precise autocollimating flat mirrors (ACFs) with sizes comparable to the SPICA telescope is not technically feasible, we plan to use sub-aperture stitching interferometry through ACFs for optical testing of the telescope. We have verified the applicability of the sub-aperture stitching technique to the SPICA telescope by performing stitching experiments in a vacuum at a room temperature, using the 800-mm telescope and a 300-mm ACF. We have also developed a new method to reduce uncertainties possibly caused by cryogenic and gravitational deformations of ACFs.
Mahmood A. Hamed,Seiichi Nakata,Ramadan H. Sayed,Hiromi Ueda,Badawy S. Badawy,Yoichi Nishimura,Takuro Kojima,Noboru Iwata,Ahmed R. Ahmed,Khalid Dahy,Naoki Kondo,Kenji Suzuki 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.4
Cholesteatoma is a cystic non tumorous lesion of the temporal bone that has the ability to destroy nearby structures by its power to cause bone resorption and as a result, fatal complications prevail. We aimed to conduct a comprehensive review for pathogenesis of acquired cholesteatoma, bone resorption mechanisms, and offer a future vision of this serious disease. We have reviewed different theories for pathogenesis of acquired cholesteatoma including the most relevant and updated ones with special emphasis on the mechanisms of bone resorption through Medline/PubMed research using the keywords ‘aetiopathogenesis, bone resorption, acquired cholesteatoma, temporal bone, and cytokines.’ In order to strengthen our study, we searched the reference lists of identified reviews. Cholesteatoma is a subject of debate among otolaryngologists since it was prescribed firstly. Over many decades, several theories were postulated for aetiopathogenesis of cholesteatoma with a tendency to follow more than one theory to explain the proper nature of that disease. Until now, the mechanism of bone resorption has yet to be more clarified. In the last century, a leap has occurred in the field of biomolecular cholesteatoma research which improved our knowledge about its pathophysiology and bone destructive mechanism. However, surgery is still the only available treatment. We conclude that discovery of new therapeutic choices for cholesteatoma other than surgery by the use of anti-growth, anti-proliferative, apoptotic agents as well as medications that antagonize osteoclastogenesis should be the main concern in the future clinical and experimental research work. Also, searching for predictors of the aggressiveness of cholesteatoma can affect the timing of intervention and prevent occurrence of complications.