Kenichi Hayashi

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The scalability of distributed-memory parallel computers makes them attractive candidates for solving large-scale problems. New languages, such as HPF, FortranD, and VPP Fortran, have been developed to enable existing software to be easily ported to such machines. Many distributed-memory parallel computers have been built, but none of them support the(More)
BACKGROUND It is well known that cardiopulmonary resuscitation (CPR) should be attempted as early as possible after out-of-hospital cardiac arrest (OHCA). However, it is unclear about the impact of time to CPR on OHCA outcome by first documented rhythm (pulseless ventricular tachycardia/ventricular fibrillation [pVT/VF], pulseless electric activity [PEA],(More)
In Augmented Reality, the occlusion between virtual and real objects has to be managed correctly, so that users can look at the natural scene. In order to overcome this problem, the depth of the real world from the user's viewpoint is employed. However, if the system is used in an environment including moving or deformable objects, the depth has to be(More)
for the Fujitsu AP1000+ David Sitsky Kenichi Hayashi Department of Computer Science High Performance Computing Group CAP Research Program Fujitsu Ltd. Australian National University Canberra, ACT 0200 Australia Kawasaki, 211-88 Japan Abstract A complete implementation of MPI for the Fujitsu AP1000+ is(More)
The performance of message-passing applications depends on cpu speed, communication throughput and latency, and message handling overhead. In this paper we investigate the effect of varying these parameters and applying techniques to reduce message handling overhead on the execution efficiency of ten different applications. Using a message level simulator(More)
BACKGROUND Inferior vena cava (IVC) diameter and its respiratory change, as determined using echocardiography, are commonly used to assess right atrial pressure (RAP). Despite the widespread use of the IVC approach for RAP assessment, the relations among body surface area (BSA), IVC diameter, and respirophasic change remain unclear. The aim of this study(More)
We discuss sample size determination in group-sequential designs with two endpoints as co-primary. We derive the power and sample size within two decision-making frameworks. One is to claim the test intervention's benefit relative to control when superiority is achieved for the two endpoints at the same interim timepoint of the trial. The other is when(More)