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The Effect of Asynchronous Carrier on Matrix Converter Characteristics
Jun OYAMA,Tsuyoshi HIGUCHI,Takashi ABE,Eiji YAMADA,Hideki HAYASHI,Takashi KOGA 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In a matrix converter, input side and output side are coupled with each other through switching elements. Since disturbances on either side affect directly on the other side, it requires a high-speed on-line control system to compensate them.<br/> We proposed in previous papers a new control strategy and an on-line control circuit for a matrix converter. The control circuit could keep the output voltage at commanded value against fluctuation in the supply voltage. Furthermore wave forms of the output voltage and the input current were always kept sinusoidal. The switching pattern was generated by comparing modified voltage references with a carrier. The carrier was synchronized with the supply voltage using a PLL system, which made the control circuitcomplicatedand costly.<br/> This paper discusses on the possibility of an asynchronized carrier. Experiment results show the input current distortion in case of asynchronous carrier is bigger than that of synchronous earner However, the detenoration can be minimized by increased carrier frequency.
AUTO TUNING OF AN AC SERVO MOTOR USING NOVEL REPETITIVE CONTROL METHOD
Jun Oyama,Tsuyoshi Higuchi,Takashi Abe,Kenichirou Hayashi,Eiji Yamada 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
For tuning the P1D parameters of an AC servo system, even a skillful engineer takes a long time and these parameteis must be re-tuned according to each application In previous woiks, we proposed a lepetitive control method with learning process to drive the horizontal-axis direct-drive robot arm with constant speed and also applied this control method to the position control in which the arm reciprocates between several points In this paper, we propose an auto tuning method of the AC servo motor Using the repetitive control method especially for periodic speed control It is very simple and powerful Availability of the control methods is confirmed experimentally.
Unscheduled Hospitalization in Adults with Congenital Heart Disease
Jun Negishi,Hideo Ohuchi,Kenji Yasuda,Aya Miyazaki,Nakanishi Norifumi,Osamu Yamada 대한심장학회 2015 Korean Circulation Journal Vol.45 No.1
Background and Objectives: Little information is available regarding adult patients with congenital heart disease (CHD) who needed unscheduledhospitalization (USH). This paper aims to elucidate the clinical features of adult patients with CHD requiring USH. Subjects and Methods: Study subjects included patients with CHD aged 18 years or older who were hospitalized at our facility during a5-year study period. Medical records were retrospectively reviewed and data regarding USH were collected. Patient’s background, underlyingheart disease, cause of hospitalization, and prognosis (second USH regardless of cause or death) were examined. Results: Overall, 959 CHD patients underwent a total of 1761 hospitalizations, including 145 patients who were unexpectedly hospitalized239 times. The median age at USH was 27 years old. Of the 959 patients, 54% were male. Underlying heart diseases included repaired tetralogyof Fallot (21%), single ventricular physiology after Fontan operation (17%), and Eisenmenger syndrome (12%). The causes of USH includedarrhythmia (40%), heart failure (20%), infectious disease (13%), and hemorrhage or thrombus (13%). A total of 48 patients requiredreadmission. In total, 13 patients died, including four hospital deaths. The USH-free survival rate was 77% for 1 year and 58% for 3 years. Conclusion: The rate of USH was high for adults with complicated CHD. Common causes of USH included arrhythmia, heart failure, hemorrhage-related or thrombus-related conditions and infection. These data provide the current status of medical care for adult CHD patientsin Japan and their therapeutic needs.
A method of selecting an active factor and its robustness against correlation in the data
Yamada, Shu,Harashima, Jun The Korean Society for Quality Management 2003 The Asian Journal on Quality Vol.4 No.2
A reducing variation of quality characteristics is a typical example of quality improvement. In such a case, we treat the quality characteristic, as a response variable and need to find active factors affecting the response from many candidate factors since reducing the variation of the response will be achieved by reducing variation of the active factors. In this paper, we first derive a method of selecting an active factor by linear regression. It is well known that correlation between factors deteriorates the precision of estimators. We, therefore, examine robustness of the selecting method against the correlation in the data set and derive an evaluation method of the deterioration brought by the correlation. Furthermore, some examples of selecting and evaluation methods are shown to demonstrate practical usage of the methods.
A method of selecting an active factor and its robustness against correlation in the data
Shu, Yamada,Jun, Harashima 한국품질경영학회 2003 The Asian Journal on Quality Vol.4 No.2
A reducing variation of quality characteristics is a typical example of quality improvement. In such a case, we treat the quality characteristic, as a response variable and need to find active factors affecting the response from many candidate factors since reducing the variation of the response will be achieved by reducing variation of the active factors. In this paper, we first derive a method of selecting an active factor by linear regression. It is well known that correlation between factors deteriorates the precision of estimators. We, therefore, examine robustness of the selecting method against the correlation in the data set and derive an evaluation method of the deterioration brought by the correlation. Furthermore, some examples of selecting and evaluation methods are shown to demonstrate practical usage of the methods.
Satoshi Yamada,Yuko Shimada,Takanori Ishida,Yuka Matsumoto,Jun Iyama,Hiroumi Shimokawa,Hiroshi Ito,Satoshi Aoyagi 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
Submerged arc welding, which is generally used for the corner joint of box-section columns, is a welding process with a high heat input. The influence on the strength and toughness of the heat-affected zone is an important concern, especially when used with a high-performance steel that may be more susceptible to heat input. The ductility of the welded corner joint is one of the important factors to ensure safety against external forces, such as during severe earthquakes. In this study, a series of material and cyclic loading tests of the corner joint comprising SA440C high-performance steel fabricated by submerged arc welding were conducted. The experimental results indicated that the welded corner joint comprising SA440C steel is ductile enough to dissipate input energy caused by the strong ground motion from an earthquake.
Removing Boundaries, Losing Connections: Electoral Consequences of Local Government Reform in Japan
Yusaku Horiuchi,Jun Saito,Kyohei Yamada 동아시아연구원 2015 Journal of East Asian Studies Vol.15 No.1
In this article we examine the role of local politicians in affecting national-level election outcomes by focusing on the drastic municipal mergers in Japan that took place in the early 2000s. Specifically, we argue that the political party that relies most extensively on local politicians’ efforts for electoral mobilization and monitoring will suffer an electoral slump when municipalities are merged and the number of municipal politicians is swiftly reduced. We empirically show that municipalities with a history of mergers exhibit significantly lower voter turnout and obtain a smaller vote share for the ruling Liberal Democratic Party in national elections when compared to other municipalities without an experience of mergers. This result indicates that municipal politicians are indispensable human resources for LDP candidates running for the national parliament.