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Basic Characteristic of 5-level Inverter with Different Divided DC Link Voltage
Matsuse, Kouki,Matsumoto, Takafumi,Kodera, Yuji Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
This paper report on experimental results of 5-level inverter by DC divided link voltage. We have alreday reported that DC divided link valtage comes to be able to reduse harmonic of out line voltage. So we tested whether DC divided link voltage can reduce harmonics in experimental setup. This paper shows simulation results and experimental results. And we confirmed that DC divided link voltage can also apply in experimental setup.
Dynamic Analysis of Product Lifecycle and Sea/Air Modal Choice: Evidence of Export from Japan
Hideki MURAKAMI,Yukari MATSUSE 한국해운물류학회 2014 The Asian journal of shipping and Logistics Vol.30 No.3
Here, we test the hypothesis that commodities at their peak valuation are transported by air, while those at their inception and maturity are shipped by sea, as well as the theory that shippers choose air to transport high-valued commodities. We empirically investigated how the product lifecycle of commodities is reflected by shippers’ choices of air over seaborne transportation. We also assumed that commodities that achieved substantial innovation in their lifecycles would be moved by air transportation so that these commodities could reach targeted markets as quickly as possible to avoid the opportunity costs that might be generated by missed business chances. We constructed two sets of unbalanced panel data of 14 commodities for 24 years drawn from Japan’s customs, demographic, and international statistics. By estimating structural equation systems that consisted of commodity-specific export and export air ratio functions, we found that the product lifecycle of cargo outgoing from Japan exactly matched the upward and downward movement of the air ratio.
Enokijima, Hiroyuki,Oka, Kazuo,Matsuse, Kouki The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4
This paper presents the experimental test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). Recently, the use of PMSM is more and more spreading in industrial field. It has the features of saving-weight and high-efficiency compared with DC motor and induction motor (IM). The maximum feature of the PMSMs is the realization of high performance position control. The independent position control validates for the factory automation (FA) apparatus as machine tool. If the independent position control of two motors with the FLI may be realized, the belt conveyer used at the FA apparatus as machine tool will become possible not only one dimension but also two dimensions with single inverter. In this paper, experimental results are verified for the independent position control of two PMSMs fed by the FLI with the vector control.
Characteristics of Repetitive Positioning Control of a Linear Pulse Servo Motor
Masayasu Yamamoto,Kouki Matsuse 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This study aims to realize high precision repetitive positioning control of the linear servo motor. The authors have previously improved the repeatability positioning precision by employing a two-degree-of-freedom PID controller in the positioning control system and by upgrading the drive system. The present study focuses on variable distance repetitive positioning control, rather than equal distance positioning, and investigates the repeatability positioning precision.<br/>
김희동,Kim, Heuy-Dong,Matsus, Kazuyasu 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.10
Experiments of shock wave/turbulent boundary layer interaction were conducted by using a supersonic wind tunnel. Nominal Mach number was varied in the range of 1.6 to 3.0 by means of different nozzles. The objective of the present study is to investigate the effects of boundary layer flow bleed on the interaction flow field in a straight tube. Two-dimensional slits were installed on the tube walls to bleed the turbulent boundary layer flows. The bleed flows were measured by an orifice. The ratio of the bleed mass flow to main mass flow was controlled within the range of 11 per cent. The wall pressures were measured by the flush mounted transducers and Schlieren optical observations were made for almost all of the experiments. The results show that the boundary layer flow bleed reduces the multiple shock waves to a strong normal shock wave. For the design Mach number of 1.6, it was found that the normal shock wave at the position of the silt was resulted from the main flow choking due to the suction of the boundary layer flow.
Analysis of Multi Level Current Source GTO Inverter for Induction Motor Drives
Takayuki ARASE,Kouki MATSUSE 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper discusses a triple stage current source GTO inverter system for high power motor drives.The energy rebound circuit of the triple stage inverter not only controls the spike voltage of the GTD inverter but also facilitates PWM control of the thynstor rectifier operated at unity fundamental input power factor Based on Pspice simulation and experiments, the principles and PWM pulse pattern for removing specific lower harmonics in the inverter's output current are discussed in detail.
Kenji Ohba,Norisato Mitsutake,Michiko Matsuse,Tatiana Rogounovitch,Nobuhiko Nishino,Yutaka Oki,Yoshie Goto,Kennichi Kakudo 대한병리학회 2019 Journal of Pathology and Translational Medicine Vol.53 No.2
Although papillary thyroid carcinoma (PTC)–type nuclear changes are the most reliable morphological feature in the diagnosis of PTC, the nuclear assessment used to identify these changes is highly subjective. Here, we report a noninvasive encapsulated thyroid tumor with a papillary growth pattern measuring 23 mm at its largest diameter with a nuclear score of 2 in a 26-year-old man. After undergoing left lobectomy, the patient was diagnosed with an encapsulated PTC. However, a second opinion consultation suggested an alternative diagnosis of follicular adenoma with papillary hyperplasia. When providing a third opinion, we identified a low MIB-1 labeling index and a heterozygous point mutation in the KRAS gene but not the BRAF gene. We speculated that this case is an example of a novel borderline tumor with a papillary structure. Introduction of the new terminology “noninvasive encapsulated papillary RAS-like thyroid tumor (NEPRAS)” without the word “cancer” might relieve the psychological burden of patients in a way similar to the phrase “noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP).”
Hiroshi Yoshizumi,Tatsuya Yamada,Kouki Matsuse,Kiyoaki Sasagawa 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The purpose of this work is to find out performance of speed sensorless direct-field-orientecl controlled induction motor operating in very low speed region using adaptive flux observer. We discuss on the effect of the characteristic of A/D converter to estimated motor speed in this control system by simulation.
Position and Speed Controls of Two Permanent Magnet Synchronous Motors Fed by a Five-Leg Inverter
Atsushi Hara,Tsutomu Tanaka,Kouki Matsuse 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the experimental and simulation test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (5LI). The 5LI is a single inverter that can drive two motors independently. In this paper, experimental results are verified for the independent position and speed control in constant torque region of two PMSMs fed by the 5LI with vector control. Simulation results are verified for the independent position and speed control including constant power region of two PMSMs fed by the 5LI with the vector control.