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A New Electrophysiological Method for the Diagnosis of Extraforaminal Stenosis at L5–S1
Hiroshi Iwasaki,Munehito Yoshida,Hiroshi Yamada,Hiroshi Hashizume,Akihito Minamide,Yukihiro Nakagawa,Masaki Kawai,Shunji Tsutsui 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.2
Study Design: A retrospective study. Purpose: To examine the effectiveness of using an electrodiagnostic technique as a new approach in the clinical diagnosis of extraforaminal stenosis at L5–S1. Overview of Literature: We introduced a new effective approach to the diagnosis of extraforaminal stenosis at the lumbosacral junction using the existing electrophysiological evaluation technique. Methods: A consecutive series of 124 patients with fifth lumbar radiculopathy were enrolled, comprising a group of 74 patients with spinal canal stenosis and a second group of 50 patients with extraforaminal stenosis at L5–S1. The technique involved inserting a pair of needle electrodes into the foraminal exit zone of the fifth lumbar spinal nerves, which were used to provide electrical stimulation. The compound muscle action potentials from each of the tibialis anterior muscles were recorded. Results: The distal motor latency (DML) of the potentials ranged from 11.2 to 24.6 milliseconds in patients with extraforaminal stenosis. In contrast, the DML in patients with spinal canal stenosis ranged from 10.0 to 17.2 milliseconds. After comparing the DML of each of the 2 groups and at the same time comparing the differences in DML between the affected and unaffected side of each patient, we concluded there were statistically significant differences (p <0.01) between the 2 groups. Using receiver operating characteristic curve analysis, the cutoff values were calculated to be 15.2 milliseconds and 1.1 milliseconds, respectively. Conclusions: This approach using a means of DML measurement enables us to identify and localize lesions, which offers an advantage in diagnosing extraforaminal stenosis at L5–S1.
Abdusalam Dawut,Hiroshi Nakayama,Rintarou Iwasaki,Toshiki Matsuda 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7
As a method of instruction of information morals education, Tamada and others proposes the method of instruction by three sorts of knowledge, and also supposes that the method called “feedback method” of making one's act examine from a victim's position is effective to the student of low information morals (Tamada et al.1987). In this research, the new teaching materials which combined a feedback method and virtual reality (VR) technology were developed, and the effect was verified. In order for the student of low information morals to make it specifically look back upon the act performed within VR from a victim's position, within VR, the subject's head shot was attached to the face of the avatar which serves as an assailant, and victim experience was carried out. As a result, before and after carrying out victim experience, improvement in the consciousness to information morals and reduction of the act contrary to information morals were seen.
Yoshikazu Matsui,Hiroshi Horikawab,Mitsunobu Iwasaki,박원규 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Nanometre-sized yttrium aluminum garnet doped with Ce3+ (YAG : Ce) crystals were prepared at a low temperatures by use of an environmentally-friendly wet process, in which an alcohol-water mixture with metal salts is refluxed without any addition of surfactants or adsorbing ligands. All of the YAG : Ce particles with 0.1-10 mol% of Ce3+ ions were found to be nanocrystals. YAG : Ce nanocrystals emitted at a 532 nm wavelength with the excitation light at 454 nm. The highest quantum efficiency was achieved at a very small Ce3+ content of 0.3 mol %. The decay curve of the fluorescence consisted of the three exponential terms, and the average fluorescence lifetime was around 110 ns irrespective of the Ce3+ concentration.
Observations of Weak Heat Flux due to Phase Transitions in CsPbX3(X=Cl, Br)
Hironori Hiraoka,Akira Kojima,Hiroshi Iwasaki,Katsuei Higashi,Ken-ichi Tozaki,Yukio Yoshimura 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We have established a system for detecting weak heat ux due to phase transitions by a combination of DTA by using the mK-stabilized cell" previously developed and treatment by both the moving average and the box car integrator by using a personal computer. By the system, the existence of a phase transition in CsPbCl3 was conrmed, having been observed by our X-ray diraction study, and the phase transition series was reported to be predominant, having a heterostructure. Weak heat ux was also observed in CsPbBr3, having been conrmed to be phase transitions by X-ray diraction. The phase transition temperatures in CsPbX3(X = Cl, Br) recognized by the heat ux measurements are in excellent agreement with the results of NQR measurements.
Selection of appropriate terms for a subjective evaluation of video game contents
Junji Yoshida,Koji Iwasaki,Eishiro Kunikane,Hiroshi Hasegawa,Masao Kasuga 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This study investigated appropriate evaluation terms representing video game characteristics. First, many terms for evaluating video games were collected from game magazines and user questionnaires. Next, an experiment of video game evaluation, in which experimental subjects evaluated the game characteristics after playing 20 video games, were performed for extracting the appropriate evaluation terms. As a result, six kinds of evaluation terms of ”innovative,” ”fantasy,” ”length of waiting time,” ”reality,” ”comical,” and ”enjoyable with many people” were selected as the appropriate evaluation terms for video games using statistical analysis.
Conclusions and Suggestions on Low-Dose and Low-Dose Rate Radiation Risk Estimation Methodology
Sakai, Kazuo,Yamada, Yutaka,Yoshida, Kazuo,Yoshinaga, Shinji,Sato, Kaoru,Ogata, Hiromitsu,Iwasaki, Toshiyasu,Kudo, Shin'ichi,Asada, Yasuki,Kawaguchi, Isao,Haeno, Hiroshi,Sasaki, Michiya The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.1
Background: For radiological protection and control, the International Commission on Radiological Protection (ICRP) provides the nominal risk coefficients related to radiation exposure, which can be extrapolated using the excess relative risk and excess absolute risk obtained from the Life Span Study of atomic bomb survivors in Hiroshima and Nagasaki with the dose and dose-rate effectiveness factor (DDREF). Materials and Methods: Since it is impossible to directly estimate the radiation risk at doses less than approximately 100 mSv only from epidemiological knowledge and data, support from radiation biology is absolutely imperative, and thus, several national and international bodies have advocated the importance of bridging knowledge between biology and epidemiology. Because of the accident at the Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi Nuclear Power Station in 2011, the exposure of the public to radiation has become a major concern and it was considered that the estimation of radiation risk should be more realistic to cope with the prevailing radiation exposure situation. Results and Discussion: To discuss the issues from wide aspects related to radiological protection, and to realize bridging knowledge between biology and epidemiology, we have established a research group to develop low-dose and low-dose-rate radiation risk estimation methodology, with the permission of the Japan Health Physics Society. Conclusion: The aim of the research group was to clarify the current situation and issues related to the risk estimation of low-dose and low-dose-rate radiation exposure from the viewpoints of different research fields, such as epidemiology, biology, modeling, and dosimetry, to identify a future strategy and roadmap to elucidate a more realistic estimation of risk against low-dose and low-dose-rate radiation exposure.
Kim, Raeyeong,Kanamaru, Shuji,Mikawa, Tsutomu,Pré,vost, Chantal,Ishii, Kentaro,Ito, Kentaro,Uchiyama, Susumu,Oda, Masayuki,Iwasaki, Hiroshi,Kim, Seog K,Takahashi, Masayuki Oxford University Press 2018 Nucleic acids research Vol.46 No.5
<P><B>Abstract</B></P><P>Mg<SUP>2+</SUP> ion stimulates the DNA strand exchange reaction catalyzed by RecA, a key step in homologous recombination. To elucidate the molecular mechanisms underlying the role of Mg<SUP>2+</SUP> and the strand exchange reaction itself, we investigated the interaction of RecA with Mg<SUP>2+</SUP> and sought to determine which step of the reaction is affected. Thermal stability, intrinsic fluorescence, and native mass spectrometric analyses of RecA revealed that RecA binds at least two Mg<SUP>2+</SUP> ions with K<SUB>D</SUB> ≈ 2 mM and 5 mM. Deletion of the C-terminal acidic tail of RecA made its thermal stability and fluorescence characteristics insensitive to Mg<SUP>2+</SUP> and similar to those of full-length RecA in the presence of saturating Mg<SUP>2+</SUP>. These observations, together with the results of a molecular dynamics simulation, support the idea that the acidic tail hampers the strand exchange reaction by interacting with other parts of RecA, and that binding of Mg<SUP>2+</SUP> to the tail prevents these interactions and releases RecA from inhibition. We observed that binding of the first Mg<SUP>2+</SUP> stimulated joint molecule formation, whereas binding of the second stimulated progression of the reaction. Thus, RecA is actively involved in the strand exchange step as well as bringing the two DNAs close to each other.</P>