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An Evaluation of Network Service Monitoring Method Using User Traffic Information
Yuji SOEJIMA,Kei TAKESHITA 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
In many cases, telecommunications carriers maintain their communication networks by monitoring the normality of equipment, which they assume represents normality of services. Since telecommunications carriers provide a network service to users, they want to directly manage and operate the service itself. However, a service monitoring method cannot be provided on a large scale due to the problems of system size and high cost. In recent years, with the spread of telemetry, individual users’ traffic information can be obtained from routers at low cost, which means the service usage status of individual users can be monitored. On the other hand, it is difficult to know whether a service has failed or is simply not being used when no traffic is observed. To overcome this problem, we propose and evaluate a service normality check method by using time series prediction in this paper.
Toru Ikegami,Jong Man Kim,Dong-Hwan Jung,Yuji Soejima,김동식,Jae Won Joh,Sung Gyu Lee,Tomoharu Yoshizumi,Masaki Mori 대한이식학회 2019 Korean Journal of Transplantation Vol.33 No.4
Early series in living donor liver transplantation (LDLT) in adults demonstrated a lower safe limit of graft volume standard liver volume ratio 25%–45%. A subsequent worldwide large LDLT series proposed a 0.8 graft recipient weight ratio (GRWR) to define small-for-size graft (SFSG) in adult LDLT. Thereafter, researchers identified innate and inevitable factors including changes in liver volume during imaging studies and graft shrinkage due to perfusion solution. Although the definition of small-for-size syndrome (SFSS) advocated in the 2000s was mainly based on prolonged cholestasis and ascites output, the term SFSS was inadequate to describe clinical manifestations possibly caused by multiple factors. Thus, the term “early allograft dysfunction (EAD),” characterized by total bilirubin >10 mg/dL or coagulopathy with international normalized ratio >1.6 on day 7, has become prevalent to describe graft dysfunction including SFSS after LDLT. Although various efforts have been made to overcome EAD in LDLT, graft selection to maintain an expected GRWR >0.8 and full venous drainage, as well as inflow modulation using splenic artery ligation, have become standard in recent LDLT.