Investigation of Ethernet switches behavior in presence of contending flows at very high-speed

This paper examines the interactions between layer 2 (Ethernet) switches and TCP in high bandwidth delay product networks. First, the behavior of a range of Ethernet switches when two long lived connections compete for the same output port is investigated. Then, the report explores the impact of these behaviors on TCP protocol in long and fast networks (LFNs). Several conditions in which scheduling mechanisms introduce heavy unfair bandwidth sharing and loss burst which impact TCP performance are shown

A study of large flow interactions in high-speed shared networks with Grid5000 and GtrcNET-10 instruments

We consider the problem of huge data transfers and bandwidth sharing in contexts where transfer delay bounds are required. This report investigates large flow interactions in a real very high-speed network and aims at contributing to high-speed TCP variants evaluation by providing precise measurements. It then also gives an insight on the behaviour of emulated alternative protocols under different realistic congestion and long latency conditions in 10~Gbps experimental environments

MR-angiographyで経過を観察しえた慢性関節リウマチに合併した巨細胞動脈炎の1例

We report a patient who developed giant cell (temporal) arteritis during treatment of rheumatoid arthritis. The patient was a 57-year-old Japanese woman and had been well controlled with anti-rheumatic drugs, when she presented to our hospital with severe bitemporal headaches and marked fatigue. An exclusive diagnosis was rapidly made and she was diagnosed as having giant cell arteritis based on the classification criteria by American College of Reumatology. Additionally, magnetic resonance (MR) angiography was performed, from which stenotic change in the bilateral superficial temporal arteries was strongly suspected and then corticosteroid therapy was quickly started. The patient followed an uneventful course without developing any complications such as visual dysfunctions. Therapeutic effect was confirmed by MR-angiographic findings obtained 4 weeks after the initiation of therapy.慢性関節リウマチ治療経過中に巨細胞動脈炎(側頭動脈炎)を合併した1例を報告した｡症例は抗リウマチ剤投与で良好にコントロールされていた慢性関節リウマチの57歳の女性で,強い両側頭部痛と全身倦怠感を主訴に来院した｡アメリカリウマチ学会(ACR)の分類基準に基づき巨細胞動脈炎と診断し,MR-アンギオグラフィーで両側浅側頭動脈の狭窄性変化を強く疑い,発症 早期よりステロイド投与を開始した｡眼合併症等を来すことなく良好な経過をとり,治療開始4週間後のMR-アンギオグラフィー再検でその治療効果を確認し得た｡MR-アンギオグラフィーで巨細胞動脈炎病変部を観察しえた報告は極めて少なく,文献的考察を加え報告する

JASMINE: Near-infrared astrometry and time-series photometry science

The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science goals. One is Galactic archaeology with a Galactic Center survey, which aims to reveal the Milky Way’s central core structure and formation history from Gaia-level (∼25 ${\mu}$as) astrometry in the near-infrared (NIR) Hw band (1.0–1.6 ${\mu}$m). The other is an exoplanet survey, which aims to discover transiting Earth-like exoplanets in the habitable zone from NIR time-series photometry of M dwarfs when the Galactic Center is not accessible. We introduce the mission, review many science objectives, and present the instrument concept. JASMINE will be the first dedicated NIR astrometry space mission and provide precise astrometric information on the stars in the Galactic Center, taking advantage of the significantly lower extinction in the NIR. The precise astrometry is obtained by taking many short-exposure images. Hence, the JASMINE Galactic Center survey data will be valuable for studies of exoplanet transits, asteroseismology, variable stars, and microlensing studies, including discovery of (intermediate-mass) black holes. We highlight a swath of such potential science, and also describe synergies with other missions