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Development of Voxel Based Machining Shape Simulator
Keiichi Shirase,Tomoyuki Kouno,Keiichi Nakamoto (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
In this study, voxel model representation is applied for a geometric machining shape simulator. A voxel model generally requires a huge amount of memory for shape representation, therefore the multilayer Octree structure of voxels is utilized to reduce the memory usage and improve the accuracy for the complicated shape representation of three-dimensional objects. Based on actual tool paths, case studies of machining shape simulation were carried out to examine the relation between the Octree layer levels with calculation time and memory usage. Furthermore, the ability to simulate machining shapes for both 3-axis and 5-axis milling operation were verified.
Genomic Basis for Methicillin Resistance in Staphylococcus aureus
Keiichi Hiramatsu,Teruyo Ito,Sae Tsubakishita,Takashi Sasaki,Fumihiko Takeuchi,Yuh Morimoto,Yuki Katayama,Miki Matsuo,Kyoko Kuwahara-Arai,Tomomi Hishinuma,Tadashi Baba 대한감염학회 2013 Infection and Chemotherapy Vol.45 No.2
Since the discovery of the first strain in 1961 in England, MRSA, the most notorious multidrug-resistant hospital pathogen, has spread all over the world. MRSA repeatedly turned down the challenges by number of chemotherapeutics, the fruits of modern organic chemistry. Now, we are in short of effective therapeutic agents against MRSA prevailing among immuno-compromised patients in the hospital. On top of this, we recently became aware of the rise of diverse clones of MRSA, some of which have increased pathogenic potential compared to the classical hospital-associated MRSA, and the others from veterinary sources. They increased rapidly in the community, and started menacing otherwise healthy individuals by causing unexpected acute infection. This review is intended to provide a whole picture of MRSA based on its genetic makeup as a versatile pathogen and our tenacious colonizer.
A Study on the Portable Space Optical Communication System for Disaster Communications
Keiichi YANO,Yoshihisa TAKAYAMA,Hiroo KUNIMORI,Koichi GYODA 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
An examination is made to simplify the existing optical transmitter and receiver for the realization of the portable space optical communication system. In the proposed system, a high-precision tracking mechanism of the receiver is reduced for the simplification. In addition, pointing is performed based on the GPS location information to reduce the optical beacons capture mechanism. Both irradiation angle error of atmospheric propagated laser and positioning error of GPS are executed, and the data transmission speed is derived from the estimated result of the diameter of the photodetector which can include these errors.
Keiichi Nakahara,Satoshi Yamashita,Katsumasa Ideo,Seigo Shindo,Tomohiro Suga,Akihiko Ueda,Shoji Honda,Tomoo Hirahara,Masaki Watanabe,Taro Yamashita,Yasushi Maeda,Yasuhiro Yonemochi,Tomohiro Takita,Yuk 대한신경과학회 2014 Journal of Clinical Neurology Vol.10 No.4
Background Listeria monocytogenes (L. monocytogenes) is a rare causative pathogen ofbrain abscess that is often found in immunocompromised patients. Although patients with supratentorial listerial abscesses showed a longer survival with surgical drainage, the standardtherapy for patients with subtentorial lesions has not been established. Case Report We report herein a patient with supra- and subtentorial brain abscesses causedby L. monocytogenes infection. These abscesses did not respond to antibiotics, and his symptoms gradually worsened. Drainage was not indicated for subtentorial lesions, and the patientwas additionally treated with hyperbaric oxygen therapy, which dramatically reduced the volume of abscesses and improved the symptoms. Conclusions This is the first report of drastic therapy for a patient with listerial brain abscesses involving combined antibiotics and hyperbaric oxygen therapy. The findings suggestthat hyperbaric oxygen therapy is a good option for treating patients with deep-seated listerialabscesses and for who surgical drainage is not indicated.