Tapping mode capacitance microscopy

科研費報告書収録論文(課題番号:07555081・基盤研究(B)(1)・H7～H9/研究代表者:羽根, 一博/原子間力顕微鏡を用いたディスク記憶装置の試作

Discriminating DRDoS Packets using Time Interval Analysis

Distributed Reflection Denial of Service (DRDoS) attack is one of the critical security threats. As the attack generates unidirectional traffic, it is not easy for the targets of the attack to protect themselves. To mitigate the attack, we need a defense mechanism installed at backbone networks, i.e., detecting and blocking the attack traffic before they reach to the destinations. A conventional approach is to monitor the traffic volume of the attack, i.e., an attack is detected if the observed traffic volume exceeds a certain threshold. However, such a simple approach may not work when an attacker adjusts the traffic volume to evade the detection. This paper proposes a novel method that can detect the DRDoS attacks accurately. The key idea is to leverage the characteristics of time intervals between the packets. We make use of the K-means clustering algorithm to find the best threshold values used to distinguish packets associated with DRDoS attacks. We implement the proposed algorithm into an equipment at a data center and demonstrate that our approach attains high accuracy

大規模有限要素法接触解析への反復法線形ソルバーの適用に関する研究

学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 奥田 洋司, 東京大学教授 吉村 忍, 東京大学教授 鈴木 克幸, 東京大学教授 中島 研吾, 東京大学教授 須田 礼仁University of Tokyo(東京大学

Magnetic phase diagram of antiferroquadrupole ordering in HoB2C2

The magnetic phase diagram for antiferro-quadrupole (AFQ) ordering in tetragonal HoB$_2$C$_2$ has been investigated by measurements of elastic constants $C_{11}$, $C_{44}$ and $C_{66}$ in fields along the basal $x$-$y$ plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001] axis in contrast to the relatively small critical field of 3.9 T in fields applied along the basal [110] axis. The quadrupolar intersite interaction of $O_{xy}$ and/or $O_2^2$ is consistent with the anisotropy in the magnetic phase diagram of the AFQ phase in HoB$_2$C$_2$.Comment: Phys. Rev. B. (2005) in press. approx 8 pages, 10 figure

Keishibukuryogan (Gui-Zhi-Fu-Ling-Wan), a Kampo Formula, Decreases Disease Activity and Soluble Vascular Adhesion Molecule-1 in Patients with Rheumatoid Arthritis

An increasing death rate due to cardiovascular disease in patients with rheumatoid arthritis (RA) has been reported. Keishibukuryogan (KBG) is a traditional Chinese/Japanese (Kampo) formula that has been administered to patients with blood stagnation, e.g. thrombotic disease and atherosclerosis. The objective of this study was to evaluate the efficacy of KBG on disease activity and endothelial dysfunction in RA patients. Sixteen RA patients were enrolled and administered KBG (12 g per day) for 12 weeks in addition to continuing other drugs. The disease activity of RA was assessed by modified disease activity scores for 28 joints (DAS(28)). Plasma levels of adhesion molecules, soluble E-selectin (sE-selectin), soluble intercellular adhesion molecule-1 (sICAM-1) and soluble vascular cell adhesion molecule-1 (sVCAM-1) were evaluated. C-reactive protein (CRP), inflammatory cytokines (IL-1β, IL-6 and TNF-α) and lipid peroxide (LPO) were also evaluated. Fourteen patients completed the study. The disease activity of RA, tender joint count, swollen joint count and DAS(28) decreased significantly. Among adhesion molecules, only sVCAM-1 decreased significantly. LPO also decreased significantly, whereas CRP and inflammatory cytokines remained unchanged. These results suggest that KBG has insufficient anti-inflammatory or immunomodulating effect but does have a beneficial effect on articular symptoms and a protective effect against endothelial dysfunction in RA patients

Development of Novel Synthetic Amine Absorbents for CO2 Capture

AbstractIn the present paper, we investigated five synthetic amine based absorbents, including three formulated solvents. Aqueous solutions of the amines (mass fraction; 30% for single amine and >30% for blended solvents) were used to evaluate the performance for CO2 capture. Gas scrubbing, vapor-liquid equilibrium (VLE), and reaction calorimetry experiments were conducted in the laboratory to obtain the absorption rate, the amount of CO2 absorbed, cyclic CO2 capacity, and heat of reaction for each absorbent. The results of these absorbents were compared with the conventional absorbent monoethanolamine (MEA). Three high performing synthetic absorbents (IPAE, IPAP and IBAE) were found, and these had lower heats of reaction, higher cyclic capacities, and comparable absorption rates compared with MEA. All formulated absorbents showed excellent cyclic CO2 capacity and keeping moderately good absorption rate and lower heats of absorption. Some blended solvents were already demonstrated with real blast furnace gas at pilot test plants with capacities of 1 ton-CO2/day and 30 ton-CO2/day and showed promising results in terms of reducing absorbent regeneration energy