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KOZAI YOSHIHIDE The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
In this paper it is explained how most of asteroids can avoid very close approach to Jupiter, to the earth for earth orbit crossing asteroids, and to Neptune for Kuiper-belt asteroids by mechanisms which work also for Neptune-Pluto system. In fact the mutual distance of the planets cannot become very small as the critical argument librates around $180^{\circ}$ because of 2:3 mean motion resonance and the argument of perihelion of Pluto librates around $90^{\circ}$. And it is found that among nearly 40 Kuiper-belt asteroids discovered in recent years $40\%$ have orbits similar to Pluto. For main-belt asteroids the distribution with respect to the semi-major axes has peculiar characteristics and the author tries to explain how their peaks and gaps are created. It is also found that $30\%$ of 80 earth orbit crossing asteroids which have minimum perihelion distances less than 1.04AU have no chance to collide with the earth. Still $30\%$ of them have a few probability to collide with the earth as they have dynamical characteristics of short-periodic comets.
TAMA-300 PROJECT FOR GRAVITATIONAL WAVE DETECTOR
KOZAI YOSHIHIDE,TEAM TAMA-300 PROJECT The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
This paper reports on the outline and the status of the TAMA-300 project, the 300 meter laser interferometer gravitational wave detector developed by a team of scientists of several research institutes and universities in Japan. In fact the project has been funded and its construction started at the National Astronomical Observatory, Mitaka, in spring 1995. And the constructions of the tunnels for the east-west and north-south arms and of the central building are completed and a half of pipes for laser beams were brought in. Very stable laser oscillator has been almost completed and mew techniques such as vibration isolations, recycling of laser power, and suspension of mirrors by double pendulums have been developed. In fact the purposes of the project are to establish techniques necessary for future km-class detectors and to operate the detector to catch possible gravitational wave events in nearby galaxies such as Andromeda, the target sensitivity being $3 {\times} 10^{-21}$ at 300Hz.
Takeshi Kozai,Francis Hirsch,Keisuke Ishida,Assanee Meesook 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
In the Mae Sot and Umphang areas (NW Thailand),Jurassic strata seal the Permian and Triassic substratum of theShan-Thai terrane with a brecciated conglomerate. Pliensbachianto Early Bajocian shallow marine strata are intercalated withinthe partly terrestrial Jurassic sequence. Thirty-five Toarcian-Aale-nian bivalve species from Mae Sot and Umphang were identified.Among these, Eomiodon chumphonensis Hayami is known onlyfrom Thailand, whereas Parvamusium donaiense (Mansuy), Myo-phoriella saurini Hayami, Thracia loducensis Hayami, Pholadomya(Bucardiomya) fontainei Hayami, Thracia loducensis Hayami andModiolus sestiniae Hayami were originally described in Vietnam.M. sestiniae also occurs in Iran. The greater part of the fauna,however, shows varying degrees of affinity with Myanmar (6 spe-apan (13 species) and Europe (9 species),Levant (2 species). In view of these, it appears that these highlyendemic Toarcian-Aalenian bivalves from Thailand characterizethe Southeastern Asian Province of Tethys.
Takeshi Kozai,Keisuke Ishida,Yasuo Kondo 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The OxfordianBerriasian Birafu Formation in thesouthern Kurosegawa Belt (Permian accretion terrane), CentralShikoku, SW Japan, yields micro- and mega-faunas that contrib-ute to the biostratigraphy across the Jurassic-Cretaceous bound-ary. The type section consists of turbiditic sandstone and mudstonewith an upward-fining tendency in the lower members (A1-A3).with muddy limestone intercalations, whereas the upper memberC is characterized by a fine-grained turbiditic succession. Radi-olarians define the assemblage zones (AZ): Kilinora spiralis AZ(Oxfordian) in member A2, Loopus primitivus AZ (Tithonian) inthe upper part of member A3, and Pseudodictyomitra carpatica AZ(Berriasian - lower Valanginian) in members B2 and C. These giveat least an Oxfordian - Berriasian total time-range to the BirafuFormation. The mixed marine and brackish bivalve assemblage ofmembers B1 and B2 (lower part) comprises Grammatodon takien-sis Tamura, Pterotrigonia toyamai (Yehara) and Ctenoides tosanusKimura, the range of which is Late Jurassic to Earliest Creta-ceous, and Aguilerella nagatoensis (Ohta), Miltha japonica Tashiroand Isocyprina japonica Tashiro and Kozai, having an Early Cre-taceous range. The concurent range of Jurassic to Cretaceousbivalves and exclusively Cretaceous species is significant for theclarification of bivalve evolution across the Jurassic -Cretaceousboundary. The Berriasian appearance of Cretaceous marine andnon-marine bivalves takes place while Late Jurassic marine bivalvesboundary situated at its base.
Chun, Changhoo,Kozai, Toyoki The Korean Society of Plant Biotechnology 2001 Plant molecular biology and biotechnology research Vol.3 No.2
Photoautotrophic micropropagation systems do not include sugar in the culture media. This characteristic provides advantages to scale up the micropropagation systems comparing photomixotrophic micropropagation systems. A closed, large-scale photoautotrophic micro-propagation for transplant production system has been developed at Chiba University, Japan. New concepts and technologies were adapted to produce high quality transplants at minimum usage of resources, and as scheduled. Newly developed software for production management was used to enhance the efficiency of the transplant production system. Currently, virus-free transplants of sweetpotato (Ipomoea batatas (L.) Lam.) are vegetatively propagated and produced under sterilized conditions in this system. This system can also be used for production of transplants of any other species including horticultural and woody plants with a minimum of modification.
Development of Wheeled Balancing Wheelchair for Lower Limb Disabled Person
Seonghee Jeong,Kazuki Kozai 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
An electrical wheelchair and a senior car are widely used as a mobility aid for a lower limb disabled person. However, since a conventional mobility aid generally focuses on assistance of mobility, it is difficult for the user to reach to a high position in a sitting posture and to travel a narrow aisle due to a large floor occupied area and turning radius. To cope with these issues , in this paper, a wheeled balancing wheelchair mounting several assisting devices was designed and its prototype was developed. It adopted a wheeled balancing mechanism to improve dynamic stability and driving performance in a complicated human living space. To overcome a drop of driving operability and safety due to the wheeled balancing mechanism, an automatic and a manual slider were introduced to improve acceleration/deceleration and emergency braking performance. In addition, a lifting device was implemented for a rider to reach to a high place. The prototype wheelchair was successfully developed implementing the above devices and a control system.
Hahn, Eun-Joo,Kozai, Toyoki,Paek, Kee-Yoeup 한국식물학회 2000 Journal of Plant Biology Vol.43 No.4
Single-node, in vitro cuttings of Rehmannia glutinosa were transplanted to MS basal media and grown for 30 d. Plant-lets were grown under various culture conditions: four different light qualities (red LEDs, blue LEDs, mixed LEDs, and fluorescent); with sucrose (30㎎·L^-1) or without (0㎎·L^-1); with air exchanges (3.5 h^-1) or without (0.1 h^-1). Highest dry weights were obtained from plantlets under blue LEDs with 3.5·h^-1 air exchanges. Light source did not affect shoot elongation in ventilated conditions, but without ventilation, the shoots of plantlets under red LEDs were twice as long as for plantlets growing under other types of lighting. Plantlets grown without sucrose showed little difference in photosynthesis under any of the tested light qualities. In contrast, the photosynthetic rate of those in the sucrose-containing media varied according to light source.