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Some Bacteriological Problems of Skin Flora
Asada, Yasuo 대한피부과학회 1985 大韓皮膚科學會誌 Vol.23 No.5
The bacterial group which we usually consider as resident flora sometimes changes into opportuniistic pathogen which produces oppartunistic infection, so that attention to resident flora remarkably increased. The main topics of bacterioloical problems of skin flora are as follows: (1) selective localization of resident flora, (2) members of resident flora and their changes by age and area, (3) the role of action of resident flora, (4) the problems of Micrococcus, (5) coagulase negative Staphylococci, (6) coagulase positive Staphylococci, (7) the problerns of Propionilbacterium(P) acnes, (8) typing of propionibacteria existing on human skin, (9) antibiotic sensitivities of P. acnes, (10) effect of tetracycline on lipase productivity oi P. acnes.
Heritability and Repeatability of Superovulatory Responses in Holstein Population in Hokkaido, Japan
Asada, Y.,Terawaki, Y. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.7
The aim of this study was to estimate heritability and repeatability for the number of embryos and transferable embryos collected per flush in Holstein population in Hokkaido, Japan. Data consisted of 306 MOET (Multiple Ovulation and Embryo Transfer) treatments on 224 Holstein cows from 1997 to 2000. Variance components for these traits were estimated using the REML procedure. The model included only non-genetic factors that were significant at the 0.05 level, through using generalized linear models, maximum likelihood methods, and stepwise regression procedure as fixed effects and sire and residual for heritabilities, donor and residual for repeatabilities as random effects. The factor identified as important in determining the results was the donor''s estrous condition after superovulation. Heritabilities for the number of embryos and transferable embryos collected per flush were 0.14 and 0.09, respectively. The corresponding repeatabilities were 0.43 and 0.32, respectively. These results show that it was difficult to genetically improve these traits, thus, environmental and physical factors affecting the donor must be improved. These results also show that it is necessary to take the donor''s estrous condition after superovulation and repeatabilities for the number of embryos and transferable embryos collected per flush into account when the genetic gains and inbreeding rates for MOET breeding schemes are predicted by a computer simulation.
Asada, Masaru,Hara, Ryoichi,Kita, Hiroyuki The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.4
Photovoltaic generation (PV) systems are growing as one of renewable energy resources in the world from their merits of low greenhouse effect gas exhaustion and less fossil fuel consumption. However, PV output widely varies depending on the insolation condition and is uncontrollable. When huge amount of PV systems are interconnected to a grid, the supply and demand balancing, one of the most important and fundamental power system operations, might become more difficult. In such situation, PV output forecast should be taken in to account in the unit commitment process and/or the online balancing operation. Particularly, the generation reserves should be set aside so that the PV output fluctuation and PV output forecast error can be compensated. From this viewpoint, this paper proposes an operational cost evaluation method considering the probabilistic feature of forecast error. Furthermore, a method for estimating the adequate reserve required for large PV installations is presented.
Asada Chikako,Nakamura Yoshitoshi,Kobayashi Fumihisa The Korean Society for Biotechnology and Bioengine 2005 Biotechnology and Bioprocess Engineering Vol.10 No.4
The chemical characteristics, enzymatic saccharification, and ethanol fermentation of autohydrolyzed lignocellulosic material that was exposed to steam explosion were investigated using bagasse as the sample. The effects of the steam explosion on the change in pH, organic acids production, degrees of polymerization and crystallinity of the cellulose component, and the amount of extractive components in the autohydrolyzated bagasse were examined. The steam explosion decreased the degree of polymerzation up to about 700 but increased the degree of crystallinity and the micelle width of the cellulose component in the bagasse. The steam explosion, at a pressure of 2.55 MPa for 3 mins, was the most effective for the delignification of bagasse. 40 g/L of glucose and 20 g/L of xylose were produced from 100 g/L of the autohydrolyzed bagasse by the enzymatic saccharification using mixed cellulases, acucelase and meicelase. The maximum ethanol concentration, 20 g/L, was obtained from the enzymatic hydrolyzate of 100 g/L of the autohydrolyzed bagasse by the ethanol fermentation using Pichia stipitis CBS 5773; the ethanol yield from sugars was 0.33 g/g sugars.
Hayato Asada,Tsuyoshi Tanaka,Satoshi Yamada,Hiroaki Matoba 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
This Paper proposes a method to improve plastic deformation capacity of the welded wide flange beam-to-columnconnections in existing steel buildings by using supplemental H-section haunches jointed by high-strength bolts and weldingwhich expected to secure construction quality. By attaching supplemental haunches to upper and lower flanges of the beam end,the critical section is moved from the beam end to the beam cross-section corresponding to the tip of the supplemental haunch. As a result, it could prevent the fracture of beam flange initiated from toe of weld access hole. Cumulative plastic deformationcapacities of retrofitted specimens were 1.5 to 2.0 times larger than that of un-retrofitted specimen.
SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF SALMON DNA-WRAPPED SINGLE-WALL CARBON NANOTUBES
YUKI ASADA,HIROFUMI DOHI,SHOTA KUWAHARA,TOSHIKI SUGAI,RYO KITAURA,HISANORI SHINOHARA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.5
Single-wall carbon nanotubes (SWNTs) can be well-dispersed in water by wrapping with short segments of natural DNA from salmon sperm. We report here the isolated DNA-wrapped SWNT hybrids. Measurements were carried out using UV-vis-NIR, near-infrared photoluminescence (PL) spectrum and atomic force microscopy (AFM). A possible charge transport between SWNTs and salmon-DNA is discussed in terms of observed spectral shifts in the photoluminescence spectra.
Obstacle Detection using Stereo Camera for Combine Robot
( Ryo Asada ),( Michihisa Iida ),( Masahiko Suguri ),( Ryohei Masuda ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Now in Japan, autonomous agricultural vehicles are attracting a lot of attention and being developed due to the decreasing and aging Japanese farmers. It is critical for autonomous drive of agricultural vehicles to detect obstacles in the field and take appropriate safety actions. Many researchers have studied various sensing technologies to detect obstacles to avoid collisions. Stereo vision sensors can obtain the ranges between an object and the cameras by utilizing the disparity between images captured by two cameras. Compared with laser and ultrasonic sensors, stereo vision has higher spatial resolution and wider scope without the need of scanning. This research aims to develop a collision avoidance system by detecting obstacles using a stereo camera. The detection algorism consists of functions for stereo image processing and point cloud analysis. Stereo processing establishes correspondence between image features in different views of the scene and calculates the disparity values of each pixel. Then the three-dimensional location is determined and 3D point cloud data can be generated. The point cloud data includes obstacle points, rice plants points, weed points and some noises. After transforming from the camera coordinates to the world coordinates, rice plants points can be almost entirely eliminated based on the height information. To distinguish the obstacle and noise area, we divided the space into small sells and extracted obstacle areas based on the point density of each cell. Then a 2D grid map which indicates obstacle area and free area in the view could be generated. In stationary tests, obstacles could be well detected from the grid map. The RMSE between the real range and the measured range was 0.104m when the obstacle was placed at a distance of 1m to 10m from the stereo camera, so it was confirmed that high distance accuracy could be achieved. Then we mounted the stereo camera on the combine robot, and conducted field tests. The combine robot took actions according to the position of the detected obstacle. If an obstacle is detected and it is in the stop area or in the slow-down area, the combine is controlled to stop or slow-down. The results indicated that the system could detect the obstacle and avoid collisions while the combine was harvesting. Nevertheless, the system had blind areas in the vicinity of the vehicle because of the angle of the view. So the use of plural stereo cameras or combined use of stereo camera and other sensors will achieve safer detection and collision avoidance system.