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Yuichi NISHIDA,WANG Hui,Hiroaki MATSUMOTO,Hiroyuki ISHIHARA,Tokumi YOKOHIRA,Yukinobu FUKUSHIMA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In wired and wireless mixed networks, split-connection type proxies have been proposed to improve TCP (Transmission Control Protocol) throughput. A proxy is placed at the boundary between a wired network and a wireless one and splits a TCP connection which is established between a host in one of these networks and a host in the other networks into two virtual TCP connections. In this paper, under such environment that IEEE 802.11 WLANs are used as wireless networks, we first investigate throughputs of TCP connections with a proxy and show that although throughputs of downflows (flows from hosts in a wired network to a host in a WLAN) are improved, throughputs of upflows (the reverse of downflows) become smaller compared to those of TCP connections without the proxy. And we clarify that such throughput degradation is caused by congestion of a WLAN, and we propose a method to suppress such congestion.
Takata, Hiroyuki,Nishida, Naohisa,Ikehara, Ken,Katsuki, Kota,Khim, Boo-Keun Elsevier 2018 QUATERNARY INTERNATIONAL Vol.482 No.-
<P><B>Abstract</B></P> <P>We investigated fossil benthic and planktonic foraminifera in sediment cores FV10-05 and FV10-06-2, off Fukuoka, southwestern Japan to evaluate the impact of the Tsushima Warm Current on coastal environments around the strait between southeastern Korea and southwestern Japan during the early to middle Holocene. A cluster analysis of benthic foraminifera in these cores established four sample clusters (A, B, C, and D), which are interpreted as indicators of relatively high energy condition due to wave/current processes. Clusters A and C, characterized by attached taxa, became dominant at ∼6.6 ka. Such faunal changes are consistent with the current-influenced sedimentation, confirming that the Tsushima Warm Current reached its present-day distribution at that time. A hiatus at ∼8–7 ka has been reported in cores from deeper water off Fukuoka, whereas our shallow core shows deposition under high energy conditions was continuous even at ∼8–7 ka near the coast off river mouth. Across the strait, the maximum landward extent of benthic foraminifera occurred in the Nakdong River delta (southeastern Korea) in ∼8–7 ka, and an outer bay fauna of benthic foraminifera with seagrass beds occurred transiently in the restricted bay of the San-in district (southwestern Japan) at that time. The evolution of the Tsushima Warm Current during the early to middle Holocene thus appears to play an important role in coastal environments not only in the strait areas between southeastern Korea and southwestern Japan, but also in the San-in district.</P>
Yasuhiro Takeuchi,Junko Hashimoto,Hiroyuki Kakihata,Yousuke Nishida,Michiko Kumagai,Chiemi Yamagiwa 대한골다공증학회 2019 Osteoporosis and Sarcopenia Vol.5 No.1
Objectives: The favorable safety and consistent effectiveness of monthly intravenous (IV) ibandronate injections was demonstrated in a prospective, postmarketing, observational study in Japanese patients with osteoporosis. Here, we present subgroup analyses from the study. Methods: Lumbar spine (L2e4) bone mineral density (BMD) gains were assessed in the following subgroups: aged <75 or 75 years, absence or presence of vertebral fractures, previous bisphosphonate (BP) treatment, and concomitant versus naïve osteoporosis drug treatment. The cumulative incidence of fractures and relative change in bone turnover markers were also examined. Results: Of 1062 enrolled patients, 1025 received monthly IV ibandronate 1mg and were assessed for 12 months. BMD gains with ibandronate were comparable, irrespective of older age or prevalent fractures. Overall, 515 patients (50.2%) had previously received osteoporosis treatment; of these, 166 (16.1%) received other BPs. Mean BMD changes were 3.69% (95% confidence interval [CI], 0.89%e6.50%) in patients previously treated with other BPs, and 4.26% (95% CI, 2.88%e5.64%) in patients who had not received prior osteoporosis treatment. Among the 510 patients (49.7%) concomitantly prescribed active vitamin D drugs, mean BMD changes were 5.74% (95% CI, 2.53%e8.95%) with eldecalcitol versus 3.54% (95% CI, 1.98%e5.10%) with ibandronate alone. The lowest fracture incidence was observed with the combination of ibandronate and eldecalcitol, but differences between the subgroups were not statistically significant. Conclusions: Monthly IV ibandronate demonstrated comparable BMD gains in the patient subgroups analyzed. Concomitant use of ibandronate with eldecalcitol showed a trend of higher BMD gains and lower fracture incidence than ibandronate alone.
Shear Strength of an Aluminum Alloy Bonded with a DP-460 Adhesive: Single Lap-shear Joints
( Hyun-bum Kim ),( Tomohisa Nishida ),( Hiroyuki Oguma ),( Kimiyoshi Naito ) 한국접착및계면학회 2020 접착 및 계면 Vol.21 No.1
Single lap-shear joints (SLJ) specimens with and without partial round fillets were fabricated to measure the average shear strength of adhesives. The effects of the length of the adherend on the SLJ specimens were also investigated. An epoxy adhesive was used to bond aluminum alloy. Tensile tests were performed on the adhesive bulk specimens to measure the mechanical properties. The finite element analysis (FEA) method was used to measure the adhesive stress distributions, i.e., the peel and shear stresses, on the bonded part. The experimental results revealed that the specimen consisting short length of adherend and without the partial round fillets exhibited the smallest average shear strength of adhesive among the investigated specimens. FEA revealed that the low average shear strength for the specimen with a short adherend length was caused by high stress concentrations on the adhesive at the edge of the bonded part.
Human Behavior recognition Using Regression Models
Mamoru Saito,Katsuhisa Kitaguchi,Hiroyuki Nishida,Masafumi Hashimoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a method for human behavior recognition by estimating the human state, i.e., position and orientation, using regression models. In the method, human silhouette in video images is detected by background sub traction technique, and the upper part of human silhouette is used for extracting the image feature. Linear regression technique is introduced to create a model that associates the image feature with human state. Human state estimation from the currently observed image is being performed through this model. Experiments are conducted on indoor space where an Omni Directional Vision(ODV) sensor is installed to the ceiling of crossing hall way. The feasibility and accuracy of our method is discussed through the experimental results.