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Feasibility on Infrared Detection of Cetaceans for Avoiding Collision with Hydrofoil

Yonehara Y., Kagami L., Yamada H., Kato H., Terada M., Okada S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2012

Vol. 6, no. 1

149--154

To achieve safer navigation without sudden collisions with large cetaceans at high speed boats such as the hydrofoil, we examined its feasibility of an installation of the infrared camera. Because any ceta-ceans are of air-breathing animals, it is theoretically expected that they can be potentially detected through imaging of the infrared cameras. Thus, we examined the feasibility of detection with aiming at sperm whales in waters off Chichijima Islands (27°4'N, 142°13'E), Japan. Through the experiment, it was revealed that sperm whales could be detected stably within 200m, and detectable cue were blow, back body and fluke tails. However, boats and waves were also detected as noise images. Especially, waves greatly resemble the whale back bodies. Although potential of the infrared camera was confirmed, there are still necessities of further ex-periments including ones conducting at different temperate waters, to successfully install the infrared camera for earlier finding of large cetaceans.

Synthesis and evaluation of novel mri contrast agents of chemically modified GD-DTPA complexes with sugars

Sugiyama M., Yamashita M., Yu G., Fujie M., Ogawa K., Ozaki N., Aoki T., Mizuno S., Okada S., Tachi K., Aoshima K., Sankar U. R., Kumar B. S., Takehara Y., Sakahara H.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

191-194

MRI is one of medical diagnostic imaging technologies that can draw the cross section in the body. To obtain a clearer image, Gd complexes are often used as MRI contrast agents. Gd-DTPA (Gd-Diethylenetriaminepentaacetate, Magnevist registered trademark ) is used in particular as the MRI contrast agents. We prepared and evaluated novel MRI contrast agents that were chemically modified Gd-DTPA with sugars (represented as Gd-DTPA-Sugar) via hydrolysis route for providing specificity to target organs and tissues. Gd-DTPASugar complex showed an excellent potential for the MRI contrast agent (r1=31.2 s-1mM-1). Gd-DTPA-Sugar complexes alternatively prepared by shorter synthetic route without protection/ deprotection (hydrolysis) method showed inferior results (r1=6.3 and 8.1 s-1mM-1) to the hydlized product.

Current states of small and lightweight pulsatile motor driven LVAD

Okamoto E., Tanaka S., Makino T., Miura K., Okada S., Mitoh A., Mitamura Y.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

155-160

A small size and lightweight motor-driven pulsatile LVAD using a ball screw has been developed. The motor-driven LVAD consists of a brushless DC motor and a ball-screw. The ball screw converts rotational motion of the motor into rectilinear motion of the pusher plate. The magnetic force between the tiny magnets on the pusher plate and the iron plate adhered on the pump diaphragm provides an active filling operation during the pump filling phase. The pump has a stroke volume of 55 ml, the whole volume of 285 ml and it weighs 360 g. The controller employs the fuzzy logic position and velocity control so that the LVAD experts’ experience could be used in the design of the controller. The LVAD was evaluated in the in-vitro experiments using the mock circulation. Maximum pump outflow of 5.1 l/min was obtained at the drive rate of 100 bpm against an afterload of 100 mmHg, and the active filling mechanism using the magnetic force provided a pump output of 3.6 l/min at a drive rate of 75 bpm under a preload of 0 mmHg. The operating efficiency of the LVAD was established to be measured between 8 and10%.