ソフトウェアリポジトリにおける制約管理に関する研究

京都大学0048新制・課程博士博士(工学)甲第6837号工博第1588号新制||工||1063(附属図書館)15924UT51-97-H221京都大学大学院工学研究科情報工学専攻(主査)教授 上林 彌彦, 教授 池田 克夫, 教授 石田 亨学位規則第4条第1項該当Doctor of EngineeringKyoto UniversityDA

Microwave analog of Stern-Gerlach effects using nonuniform chiral metamaterials

This study observes microwave beam splitting dependent on circular polarizations through nonuniform chiral metamaterials. Nonuniform chiral metamaterials with a gradation in refractive index are constructed using chiral meta-atoms that exhibit optical activities at microwave frequencies. Microwave scattering far-field patterns by the nonuniform chiral metamaterials demonstrate a deflection of microwaves, which transmit in a direction perpendicular to the refractive index gradient. Furthermore, circularly polarized microwaves with opposite “spins of light” go their separate ways in the nonuniform chiral metamaterials. This phenomenon is an optical analog of the Stern-Gerlach effects for electrons

Screening for cold tolerance genes in C. elegans, whose expressions are affected by anticancer drugs camptothecin and leptomycin B

Okahata M., Sawada N., Nakao K., et al. Screening for cold tolerance genes in C. elegans, whose expressions are affected by anticancer drugs camptothecin and leptomycin B. Scientific Reports 14, 5401 (2024); https://doi.org/10.1038/s41598-024-55794-z.Temperature is a vital environmental factor affecting organisms’ survival as they determine the mechanisms to tolerate rapid temperature changes. We demonstrate an experimental system for screening chemicals that affect cold tolerance in Caenorhabditis elegans. The anticancer drugs leptomycin B and camptothecin were among the 4000 chemicals that were screened as those affecting cold tolerance. Genes whose expression was affected by leptomycin B or camptothecin under cold stimuli were investigated by transcriptome analysis. Abnormal cold tolerance was detected in several mutants possessing genes that were rendered defective and whose expression altered after exposure to either leptomycin B or camptothecin. The genetic epistasis analysis revealed that leptomycin B or camptothecin may increase cold tolerance by affecting a pathway upstream of the insulin receptor DAF-2 that regulates cold tolerance in the intestine. Our experimental system combining drug and cold tolerance could be used for a comprehensive screening of genes that control cold tolerance at a low cost and in a short time period

Behavior and reproduction of the rotifer Brachionus plicatilis species complex under different light wavelengths and intensities

We investigated the influence of light on phototactic behavior and reproduction in two species of rotifer from the Brachionus plicatilis species complex (B. plicatilis sensu stricto (s. s.) and Brachionus manjavacas). This was done to understand how light effects these species so that we might use this knowledge to establish a more efficient aquaculture protocol. We used four different light wavelengths (white, with peaks at 460 and 570?nm; blue at 470?nm; green at 525?nm; and red at 660?nm) and four intensities (i.e., 0.5?30.0?W/m2). Using micro-spectrophotometry we determined that eyespots of these two Brachionus species absorbed blue and green light 5.5 times more than red light. B. plicatilis s. s. showed positive phototaxis under white, blue, and green light at lower light intensities, but no phototaxis under red light at all intensities (0.5, 6.2, 15.0, and 30.0?W/m2). Similar patterns of phototaxis were observed in B. manjavacas and did not differ among mictic, amictic females, and male rotifers. Population growth rate of B. plicatilis s. s. under dark condition was 1.1?1.2 times higher than that under white light condition. No significant differences were observed in population growth rate at 3.8 and 6.2?W/m2 at all light wavelengths. On the other hand, population growth rates at 0.5 and 1.6?W/m2 were the lowest under blue light. According to these results, both wavelength and intensity of light affect the population growth of rotifers, which in turn may be influenced by the rotifers\u27 wavelength-dependent phototaxis

A Quality-Driven Software Architecture Design Method for IoT Systems

40273841 (科研費)南山大学IoTシステムのための品質主導型ソフトウェアアーキテクチャ設計手法の研究 2020～2022年度科学研究費助成事業 (基盤研究 (C) (一般)) 研究成果報告書33917 (科研費)202220K11759 (科研費)research repor

Video conference smart room: an information fusion system based on distributed sensors

International audienceThe needs for cross domain technologies called mecatronics have increased in the recent years and examples of mechanical tools directed by computers are now widely available. This paper gives an example of information fusion in the context of a video conference room and exposes two axes of the research. First it shows how to fuse information provided by several sources to locate a speaker. To do this, the system fuses data produced by video cameras and their associated image processing algorithm, with information resulting from signal processing algorithms applied on several micro-phones. Second, this article describes the distributed information fusion system (DIFS) used and the algorithm which decides where the speaker is located in order to allow focus on him. The whole application is managed by a new control system specifically developed for DIFSs. Some key points of the theoretical model on which the control is based are also given