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Tomizawa, Sadao,Saitoh, Kayo The Korean Statistical Society 1998 Journal of the Korean Statistical Society Vol.27 No.3
For square contingency tables with ordered categories, Tomizawa (1995) considered two kinds of measures to represent the degree of departure from global symmetry, which means that the probability that an observation will fall in one of cells in the upper-right triangle of square table is equal to the probability that the observation falls in one of cells in the lower-left triangle of it. This paper proposes a generalization of those measures. The proposed measure is expressed by using Cressie and Read's (1984) power divergence or Patil and Taillie's (1982) diversity index. Special cases of the proposed measure include TomiBawa's measures. The proposed measure would be useful for comparing the degree of departure from global symmetry in several tables.
Optimizing Contrast Medium Injection for Coronary CT Angiography Using Myocardial CT Perfusion Data
Tomizawa Nobuo,Chou Shengpu,Matsuoka Satoshi,Yamamoto Kodai,Inoh Shinichi,Nojo Takeshi,Kumamaru Kanako Kunishima,Fujimoto Shinichiro,Nakamura Sunao 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.4
Objective: To derive and validate a formula to predict the optimal amount of contrast medium for coronary CT angiography (CTA) from CT perfusion (CTP) data during comprehensive cardiac CT. Materials and Methods: The derivation and validation group consisted of 196 and 41 patients, respectively. Dynamic CTP was performed under adenosine triphosphate stress of 0.14 mg/kg/min, followed by rest coronary CTA. Time to peak (TTP) and peak enhancement (PE) in the left ventricle during CTP was recorded. The amount of contrast medium during CTA was 0.8×body weight (kg) in the derivation group. A formula to determine the amount of contrast medium needed to achieve an enhancement of 370 Hounsfield unit (HU) in CTA was derived using TTP, PE, body weight, and heart rate. The amount of contrast medium required during CTA in the validation group was determined by this formula. Results: The mean amount of contrast medium during CTA did not differ between the derivation and validation groups (49.3±8.0 mL vs. 47.9±12.9 mL, p=0.39). The mean coronary artery enhancement was slightly lower in the validation group (400±55 HU vs. 380±46 HU, p=0.03) with smaller interpatient variability (p=0.02) than in the derivation group. The proportion of patients with an optimal enhancement of 320 HU to 420 HU significantly increased from 54% to 75% (p=0.01) when the formula was used. Conclusion: Adjusting the amount of contrast medium using dynamic CTP data could reduce the interpatient variability of coronary enhancement during comprehensive cardiac CT.
GAUSS DISCREPANCY TYPE MEASURE OF DEGREE OF RESIDUALS FROM SYMMETRY FOR SQUARE CONTINGENCY TABLES
Tomizawa, Sadao,Murata, Mariko The Korean Statistical Society 1992 Journal of the Korean Statistical Society Vol.21 No.1
A measure is proposed to represent the degree of residuals from the symmetry model for square contingency tables with nominal categories. The measure is derivedby modifying the sum of squared singular values for a skew symmetric matrix of the residuals from the symmetry model. The proposed measure would be useful for comparing the degree of residuals from the symmetry model in several tables.
An Agreement Model Having Structure of Symmetry Plus Main-Diagonal Equiprobability
Tomizawa, Sadao The Korean Statistical Society 1992 Journal of the Korean Statistical Society Vol.21 No.2
A model is proposed for describing agreement between two raters on a nominal categorical scale. This model has a structure of symmetry plus main-diagonal equiprobability, which is a special case of the quasi-symmetry model. An example is given.
Universal Design of Robot Management System for Daily-Life-Supporting Robots
Bong Keun KIM,Tetsuo TOMIZAWA,Hyun Min DO,Jae Hoon LEE,Hideyiki TANAKA,Yasushi SUMI,Hiromu ONDA,Tamio TANIKAWA,Kohtaro OHBA 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In order to cope with many problems of everyday activities which requires robots to accomplish complex yet routine tasks in changing environments, this study focuses on universality and proposes seven principles of universal design with robots. These principles are used to design a robot management system that manages and controls information-structured environment with robots, ambient intelligent systems, and everyday objects. A particular scenario is considered to verify the feasibility of the proposed design method.
Distributed Actuation Module for Ubiquitous Robot
Kazutaka Takaki,Tetsuo Tomizawa,Tamio Tanikawa,Kohtaro Ohba,Makoto Mizukawa 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Ubiquitous robots consist of distributed and networked robot elements such as sensor, computer, actuator, and etc. Distributed Actuation Module (DAM) is one of the ubiquitous robot elements, which provide physical services. If the technology of the DAM develops as well as sensor and computer technology, a user can match up and set robot elements freely. The ubiquitous robot can be designed according to the knowledge of the engineer as well as the true needs of the user. This paper describes problems of communication method and synchronization method for the DAM, and proposes a method to solve them. We also implemented the proposed methods to actual Active Caster which is wheel type actuator and evaluated the concept and functionalities.
Low Iodine Dose is Related with Overestimation of Extracellular Volume Derived from Cardiac CT
Hiroaki Arakawa,Nobuo Tomizawa,Shengpu Chou,Satoshi Matsuoka,Kodai Yamamoto,Shinichi Inoh,Takeshi Nojo,Kanako Kunishima Kumamaru,Shinichiro Fujimoto,Sunao Nakamura 아시아심장혈관영상의학회 2020 Cardiovascular Imaging Asia Vol.4 No.2
Objective: To assess the relationship between the amount of injected contrast medium and the extracellular volume (ECV) value during cardiac CT and to propose a minimum amount of contrast medium necessary to correctly calculate ECV. Materials and Methods: A total of 95 patients who underwent comprehensive cardiac CT were included. Patients first underwent myocardial CT perfusion (CTP) with a contrast medium dose determined by the body weight (<70 kg: 50 mL; 70–89 kg: 55 mL; ≥90 kg: 60 mL). Coronary CT angiography (CTA) scan followed with a contrast medium dose of 0.8×body weight (kg). We defined the ECV value calculated after CTP as ECVCTP, and we used the ECV value calculated after the CTA exam as the reference standard (ECVref). We calculated the difference in ECV values (ECVdiff) as ECVCTP-ECVref. Results: The injected iodine doses during CTP and the entire exam were 284±50 and 559± 69 mg iodine/kg, respectively. There was a weak but significant negative relationship (R2 =0.07, p=0.01) between the injected iodine dose during CTP and ECVdiff. The ECVdiff of patients who received an injected iodine dose of <285 mg iodine/kg during CTP was significantly higher (2.7±4.1 vs. 0.8±3.4%, p=0.02) than that of the remaining patients. Conclusion: ECV derived from cardiac CT might be overestimated when a small amount of contrast medium is injected. Inj
Design Study of Superconducting Transmission Line Magnet for J-PARC MR Upgrade
Ogitsu, Toru,Konaka, Akira,Tomizawa, Masahito,Muto, Ryotaro,Tanaka, Kenichi,Okada, Ryutaro,Taekyung Ki,Dhakarwal, Mukesh IEEE 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>In order to enhance the beam efficiency of the J-PARC main ring, installation of a new ring is being considered. The new ring, which can accommodate up to 30-GeV proton beam, enables to operate the fast and slow extractions simultaneously with the maximum throughput. Use of superconducting transmission line magnets is proposed as bending magnets for the new ring. Design study of the magnets has started. This paper reports on the brief concept of the new ring, requirements to the magnets, and the status of the design study.</P>