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Bioelectric potential characteristic of pothos under light emitting diode
Shin-ichi Shibata,Takashi Oyabu,Haruhiko Kimura 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Plant bioelectric potential changes according to environmental factors, for example temperature, humidity,light intensity and atmospheric pressure. Light is very important factor for plant to photosynthesize. In this paper, the relationship between bioelectric potential and wave length of emitting light (LED: blue, green, red and white) wasexamined. The characteristic in darkness was adopted as a control and it was compared with the characteristics in eachwave length. The characteristic was measured as a function of time. The data was input every 0.1 seconds and summedfor one hour. The summation value was adopted as a representative value. The correlation-ship between the characteristic under light emitting and the control was derived. The coefficient had a maximum as the characteristicunder emitting was shifted one to three hours as of control characteristic. The coefficient became lower as the frequencyof emitting light became higher. The coefficient of 0.84 under red light (660 nm) at the shifted time of 3 hours was obtained, and 0.7 for green light (525 nm) at the shifted time of one hour, 0.5 for blue (475 nm) without shift. Thecoefficient of over 0.5 was obtained under white light at the shifted time of one to two hours. It is thought that the result makes contribution to elucidate the plant physiology. In addition, it makes contribution to plant environmental sensorand plant factory.
A SOURCE EXTRACTION METHOD FOR THE AKARI MID-IR FAINT SOURCE CATALOGUE
KEICHIRO NAKAMICHI,DAISUKE ISHIHARA,HIDEHIRO KANEDA,SHINKI OYABU,TORU KONDO,TOMOYA AMATSUTSU,Hidetoshi Sano,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
We plan to produce a faint source catalogue from the AKARI mid-infrared (IR) all-sky diffuse maps. In the publicly-available AKARI mid-IR point source catalogue (PSC), sources were extracted from single-scan images, and confirmed by using the other scan images. By stacking multiple scan images, we can detect fainter sources which are not listed in the PSC. We optimized the source extraction process using a $6^{\circ}\times6^{\circ}$ area around the star-forming region, Cepheus B. Then, we divided the all-sky data into three seasonal images, and checked the positions and the fluxes of the detected sources on the images. As a result, our new source extraction method works well; 90\% of the sources are also identified in the WISE catalogue. In this method, we obtain the detection limit twice deeper than that of the PSC. The number of sources increases by a factor of 2, as compared with the PSC.
Yamagishi, Mitsuyoshi,Kaneda, Hidehiro,Ishihara, Daisuke,Oyabu, Shinki,Onaka, Takashi,Shimonishi, Takashi,Suzuki, Toyoaki,Minh, Young Chol IOP Publishing 2013 ASTROPHYSICAL JOURNAL LETTERS - Vol.773 No.2
<P>With AKARI, we obtain the spatially resolved near-infrared (NIR) (2.5-5.0 mu m) spectra for the nearby starburst galaxy M 82. These spectra clearly show absorption features due to interstellar ices. Based on the spectra, we created the column density maps of H2O and CO2 ices. As a result, we find that the spatial distribution of H2O ice is significantly different from that of CO2 ice; H2O ice is widely distributed, while CO2 ice is concentrated near the galactic center. Our result reveals for the first time variations in CO2/H2O ice abundance ratio on a galactic scale, suggesting that an ice-forming interstellar environment changes within a galaxy. We discuss the cause of the spatial variations in the ice abundance ratio, utilizing spectral information on the hydrogen recombination Br alpha and Br beta lines and the polycyclic aromatic hydrocarbon 3.3 mu m emission appearing in the AKARI NIR spectra.</P>
MODELING OF THE ZODIACAL LIGHT FOR THE AKARI MID-IR ALL-SKY DIFFUSE MAPS
TORU KONDO,DAISUKE ISHIHARA,HIDEHIRO KANEDA,SHINKI OYABU,TOMOYA AMATSUTSU,KEICHIRO NAKAMICHI,Hidetoshi Sano,TAKAFUMI OOTSUBO,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
The AKARI 9 and 18 $\mu$m diffuse maps reveal the all-sky distribution of the interstellar medium with relatively high spatial resolution of $\sim$6$''$. The zodiacal light is a dominant foreground component in the mid-infrared. Thus, removal of the zodiacal light is a critical issue to study low surface brightness Galactic diffuse emission. We carried out modeling of the zodiacal light based on the Kelsall model which is constructed from the COBE data. In the previous study, only a time-varying component of the zodiacal light brightness was used for determination of the model parameters. However, there remains a residual component of the zodiacal light around the ecliptic plane even after removal with the model. Therefore, instead of using a time-varying component, we use the absolute brightness of the zodiacal light and we find that the new model can better remove the residual component. As a result, the best-fit model parameters are changed from those in the previous study. We discuss the properties of the zodiacal light based on our new result.
STUDY OF CO2/H2O ICE ABUNDANCE RATIOS IN NEARBY GALAXIES WITH THE AKARI NEAR-INFRARED SPECTROSCOPY
MITSUYOSHI YAMAGISHI,HIDEHIRO KANEDA,SHINKI OYABU,DAISUKE ISHIHARA,TAKASHI ONAKA,TAKASHI SHIMONISHI,Toyoaki Suzuki 한국천문학회 2017 天文學論叢 Vol.32 No.1
We study $\mathrm{CO_2/H_2O}$ ice abundance ratios in nearby galaxies using $AKARI$ near-infrared slit spectroscopy. Past studies of the ices intensively examined $\mathrm{CO_2/H_2O}$ ratios mainly in our Galaxy, and found that there were considerable variations in the $\mathrm{CO_2/H_2O}$ ratios from object to object. The cause of the variations is, however, still under debate. As a result of the analysis of our sample that includes 1031 regions in 158 galaxies, the $\mathrm{CO_2/H_2O}$ ratios are in a range of 0.05--0.30. In the dataset, we find that the $\mathrm{CO_2/H_2O}$ ratios positively correlate with the Br$\alpha$/PAH 3.3 $\mu$m ratios which reflect the massive star formation activity. Furthermore, we find that the $\mathrm{CO_2/H_2O}$ ratios positively correlate with the specific star formation rates of the galaxies where the ices are detected, that reflect the evolutionary stage of a galaxy. These results suggest that the $\mathrm{CO_2/H_2O}$ ratios are enhanced in active star-forming regions and young galaxies.
SEARCH FOR DEBRIS DISKS BY AKARI AND IRSF
NAMI TAKEUCHI,DAISUKE ISHIHARA,HIDEHIRO KANEDA,SHINKI OYABU,HIROSHI KOBAYASHI,TAKAHIRO NAGAYAMA,TAKASHI ONAKA,HIDEAKI FUJIWARA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Debris disks are important observational clues to understanding on-goingplanetary system formation. They are usually identified by significantmid-infrared excess on top of the photospheric emission of a central star onthe basis of prediction from \sl J\rm-, \sl H\rm-, and \sl Ks\rm-band fluxes and the stellar model spectra. For bright stars, 2MASS near-infrared fluxes suffer large uncertainties due to thenear-infrared camera saturation. Therefore we have performed follow-up observations with the IRSF 1.4 mnear-infrared telescope located in South Africa to obtain accurate \sl J\rm-, \sl H\rm-, and \sl Ks\rm-bandfluxes of the central stars. Among 754 main-sequence stars which are detected in theAKARI 18 $\mu$m band, we have performed photometry for 325 stars with IRSF. As a result, we have successfully improved the flux accuracy of the centralstars from 9.2 \% to 0.5 \% on average. Using this dataset, we have detected 18$\mu$m excess emission from 57 stars in our samples with a 3$\sigma$ level. We find that some of them have high ratios of the excess to the photospheric emission even around very old stars,which cannot be explained by the current planet-formation theories.
A Case Study of Human Resource Allocation for Effective Hotel Management
Kayoko Murakami,Seren Ozmehmet Tasan,Mitsuo Gen,Takashi Oyabu 대한산업공학회 2011 Industrial Engineeering & Management Systems Vol.10 No.1
The purpose of this study is to optimally allocate the human resources to tasks while minimizing the total daily human resource costs and smoothing the human resource usage. The human resource allocation problem (hRAP) under consideration contains two kinds of special constraints, i.e. operational precedence and skill constraints in addition to the ordinary constraints. To deal with the multiple objectives and the special constraints, first we designed this hRAP as a network problem and then proposed a Pareto multistage decision-based genetic algorithm (P-mdGA). During the evolutionary process of P-mdGA, a Pareto evaluation procedure called generalized Pareto-based scale-independent fitness function approach is used to evaluate the solutions. Additionally, in order to improve the performance of P-mdGA, we use fuzzy logic controller for fine-tuning of genetic parameters. Finally, in order to demonstrate the applicability and to evaluate the performance of the proposed approach, P-mdGA is applied to solve a case study in a hotel, where the managers usually need helpful automatic support for effectively allocating hotel staff to hotel tasks.
Ban, Hiromi,Dederick, Toby,Nambo, Hidetaka,Oyabu, Takashi Korean Institute of Industrial Engineers 2004 Industrial Engineeering & Management Systems Vol.3 No.1
The writing styles of TIME and Newsweek are analyzed using a specially developed linguistic program. These two news magazines were chosen because of their wide popularity. As for the results, it became obvious that both the frequency curve of words and that of characters have not changed for the past 60 years. Also, we have found that the frequency curves have some inflection points and that the genre of English writings can be identified by these points. After counting the percentage of required vocabulary for junior high school students and high school students in English writings, we can derive the relative difficulties of them using fuzzy reasoning. Fuzzy rules are constructed using features of the characteristic curves. We feel it would be a good guide index when selecting textbooks or supplementary readers.