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IWASA, M.A.,OHDACHI, S.,HAN, S.-H.,OH, H.-S.,ABE, H.,SUZUKI, H. 濟州大學校 基礎科學硏究所 2003 基礎科學硏究 Vol.16 No.2
We revised the taxonomic status of a white-toothed shrew (Insectivora, Mammalia) on Cheju Island, South Korea, which has been regarded as japanese white-toothed shrew, Crodidura dsinezumi, by analyzing karyotype and restriction fragment length polymorphism (RFLP) for the nuclear ribosoma RNA gene(rDNA) spacer regions. Karyotype of a specimen of Crocidura from Cheju Island was the same as in lesser white-toothed shrew, C. suaveolens, from Tsushima Island and the Eurasian Continent, carrying 2n=40 and FN (fundamental arm number of diploid autosomal set) = 46, whereas C. dsinezumi from the Japanese Islands shows 2n=40 and FN=52. The rDNA-RFLP was examined in two specimens of Crocidura from Cheju Island, two C. dsinezumi from Japan (Honshu and Kyusuh), and one C. suaveolens from the Korean Peninsula, using six restriction sites with the 28S mouse rDNA probe. The shrews from Cheju Islnad possessed four restriction sites common to C. suaveolens from the Koeran Peninsula but only one site common to C. dsinezumi, indicating the shrews from Cheju Island are genetically more close but distinct from the Korean Penisula populations of C. suaveolens. From the results of karyotype and rDNA-RFLP, the specimens from Cheju Island can be regarded as C. suaveolens as a taxonomic unit. Nous avons re´vise´ le statut taxonomique d'une musaraigne a` dents blanched (Mammalia, Insectivora) de l'ile cheju, Core´e du Sud, qui a e´te´ conside´re´e comme la musaraigne japonaise a` dents blanches Crocidura dsinezumi d'apre's I'analyse de son caryotype et de restructuration du polymorphisme d'un fragment de longueur(RFLF) pour les re´gions plus espace´es du ge`ne ribosomal nucle´aire RNA (rDNA). Le caryotype d'un spe´cimen de Crocidura de l'ile Cheju e´tait le me^me qui celui de la petite Crocldura, C. suaveolens, de l'ile Tsushima et du continent eurasien qui a 2n=40 et NF=46, tandis que C. dsinezumi des i^les japonaises a 2n=40 te NF=52. Le rDNA-RFLP a e´te´ examine´ dans deux spe´cimens de Crocidura de l'ile Cheju, deux C. dsinezumi du Japon (Honshu et Kyushu), et un C. suavelens de la pe´ninsule de Core´e, utilisant six sites de restriction avec la sonde rDNA 285 de la souris. Les musaraignes de l'ile Cheju pre´sentent quatre sites de restriction en commun avec C. suaveolens de la pe´ninsule de Core´e, mais seulement un site en commun avec C. dsinezumi, ce qui indique que les musaraignes de l'ile de Cheju sont ge´ne´tiquement plus proches mais distinctes des population de C. suaveolens de la pe´ninsule de core´e. D'apre`s re´sultats du caryotype de RFLP et de rDNA, les spe´cimens de l'ile de Cheju peuvent e^tre regarde´s comme des C. suaveolens.
High-temperature superconductors for NMR/MRI magnets:opportunities and challenges
Iwasa, Yukikazu,Bascunan, Juan,Hahn, Seungyong,Yao, Weijun The Korea Institute of Applied Superconductivity a 2009 초전도와 저온공학 Vol.11 No.2
The unique features of HTS offer opportunities and challenges to a number of applications. In this paper we focus on NMR and MRI magnets, illustrating them with the NMR/MRI magnets that we are currently and will shortly be engaged: a 1.3 GHz NMR magnet, an "annulus" magnet, and an $MgB_2$whole-body MRI magnet. The opportunities with HTS include: 1) high fields (e.g., 1.3 GHz magnet); 2) compactness (annulus magnet); and 3) enhanced stability despite liquid-helium-free operation ($MgB_2$whole-body MRI magnet). The challenges include: 1) a large screening current field detrimental to spatial field homogeneity (e.g., 1.3 GHz magnet); 2) uniformity of critical current density (annulus magnet); and 3) superconducting joints ($MgB_2$magnet).
G-Proteins Expressed in the Ocellus of the Hydromedusan, Spirocodon saltatrix.
Iwasa, Tatsuo,Shimazaki, Yumiko,Yamamoto, Masamichi,Ohtsu, Kohzoh Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
We have cloned a hydromedusan opsin cDNA and showed that the deduced amino acid sequence of the cytoplasmic loop between helices 5 and 6 (loop 5-6) was clearly different from that reported so far. The amino acid sequence of the loop 5-6 is important on determination of the specificity for the coupled G- protein. To clarify which class of G-protein mediates the phototransduction system in the ocellus of the hydromedusan, we investigated G-proteins expressed in the ocellus. By PCR against the cDNA of the ocellus with primers designed according to the conserved amino acid sequence in G-protein a subunit, we obtained three kinds of cDNA fragments. Based on the sequence similarities, ttwo of them (JGI and JG3) were classified as $G_{i}$ and $G_{q}$, respectively. The other one (JG2) was a new subtype within $G_{*}$ class. Electron microscopic immunocytochemistry with the antiserum against the C-terminal sequence of $G_{q}$ or $G_{t}$ revealed the presence. of the both classes in the ocellus. The similarity of the C-terminal sequence of the JG2 with that of bovine $G_{t}$ suggests that the anti- $G_{t}$ antiserum would bind to JG2. These results suggest the possibility that the hydromedusan rhodopsin decides the specificity for the coupled G-protein by the other domain than the loop 5-6.oop 5-6.5-6.
Strategic Divisionalization, Product Differentiation and International Competition
Kazumichi Iwasa,Toru Kikuchi 한국경제연구학회 2007 Korea and the World Economy Vol.8 No.2
This paper constructs a simple international differentiated duopoly model that involves a divisionalization decision. It will be shown that the number of third market divisions of a parent firm with a cost advantage is relatively large. The results imply that the cost competitiveness of the firm of one country will be magnified through divisionalization decisions.
Model Predictive Sensor Scheduling
Eriko Iwasa,Kenko Uchida 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The sensor scheduling is to select a sensor (or a group of sensors) from multiple sensors at each time step so as to perform optimally a task based on the sensed data. In this paper, we pose a model predictive type deterministic/ stochastic sensor scheduling problem for discrete-time linear Gaussian time-varying systems, and develop an approach to solve these problems based on the dynamic programming recursion. We show first that, in a special case of deterministic scheduling where the Riccati recursion of error covariance satisfies a specific structural condition, the online optimization using the dynamic programming is reduced to a static optimization, so that the model predictive sensor scheduling can be easily implemented online. Next, we discuss the stochastic scheduling problem, and show an alternative condition of optimization reduction, which lead to a stochastic sensor scheduling easily implemented online. Finally, we propose two practical sensor schedulings for deterministic and stochastic case, and discuss an example to illustrate the two sensor schedulings.
Radioprotection effect and Immune Enhancement for Enterococcus Faecalis (EF 2001)
Yeunhwa Gu,Hiroyuki Iwasa,Takashi Nakamura,Masahoro Iwasa,Takeo Hasegawa,Takenori Yamashita,Masami Oshima,Kaoru Terai,Mituchana yuicti,Kenichi Bamen,Tetsuo Takeuchi,Kyoo Seok Ahn 한의병리학회 2004 대한동의병리학회 학술대회논문집 Vol.2004 No.8
Effect analysis of incense on autonomic nerve activity and improvement of working task
Masaya Kawada,Shin’ichi Tachiwana,Kazushi Iwasa,Takehiko Iwasa,Keisuke Suzuki 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.06
In recent years, the effects of fragrance on the mental and physical condition are being discussed. It has been reported that the fragrance has the effects to reduce mental stress and to improve the mental concentration on human. All of these reports investigated the effects of aroma oil on human. Therefore, in this study, we investigated the effects of the incense on the mental and physical condition. The incense is traditional fragrance in Japan. We analyzed the activation of sympathetic nerve in terms of CSI (Cardiac Sympathetic Index) and the activation of parasympathetic nerve in terms of CVI (Cardiac Vagal Index) in order to investigate the fluctuation of autonomic nerve system. At the same time, we analyzed oxyHb concentration which is an index of active state of brain in order to investigate concentration on the mental task. Through these investigations, it was clarified that the incense has the effect to make mind and body relaxed at rest because value of CVI increased when incense was presented. It was suggested that the incense has the effect to quiet down brain because brain blood flow decreased when incense was presented at rest. In addition, it was clarified that the incense improve mental concentration because the performance of work improved when incense was presented. Furthermore, we confirmed the possibility that the restraint of the fluctuation of the sympathetic nerve is related to improvement of the mental concentration because the fluctuation of the value of CSI becomes small at the time of work when incense was presented.