Optimal Unity Power Factor Control of Permanent Magnet Synchronous Motor with q-axis Field by Inverse LQ Method

Takami, Hiroshi The Korean Institute of Power Electronics 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2

A synchronous motor(SM) with q-axis special field winding of which the q-axis field-current compensates and cancels armature reaction can be driven at unity power factor under the conditions of transient state as well as steady state. The motor operates in high efficiency in all conditions. However, in order to obtain maximum performance of the motor, it is required that the time constant of armature circuit corresponds to that of q-axis field circuit. Inverse LQ(ILQ) design method on a basis of the pole assignment is suitable for this problem:(1) The time constants of the output responses can be designed for desired specifications, (2) Relations between feedback gains and response of closed loop system are very clear and (3) Optimal solutions can be given by simple procedure of ILQ method without solving the Ricaati's equation, compared to the usual LQ design method. Accordingly, the ILQ method can make the responses of armature current and q-axis field-current correspond. In this paper, it is proved by numerical simulations and experiments that the ILQ method is very effective for optimal regulator design of this plant and realizes a high-performance motor with unity power factor and high efficiency.

EMISSION MECHANISM OF “GREEN FUZZIES” IN HIGH-MASS STAR-FORMING REGIONS

Takami, Michihiro,Chen, How-Huan,Karr, Jennifer L.,Lee, Hsu-Tai,Lai, Shih-Ping,Minh, Young-Chol IOP Publishing 2012 The Astrophysical journal Vol.748 No.1

<P>The Infrared Array Camera (IRAC) on the Spitzer Space Telescope has revealed that a number of high- mass protostars are associated with extended mid- infrared emission, particularly prominent at 4.5 mu m. These are called 'Green Fuzzy' emission or 'Extended Green Objects.' We present color analysis of this emission toward six nearby (d = 2- 3 kpc) well- studied high- mass protostars and three candidate high- mass protostars identified with the Spitzer GLIMPSE survey. In our color- color diagrams, most of the sources show a positive correlation between the [3.6]-[4.5] and [3.5]-[5.8] colors along the extinction vector in all or part of the region. We compare the colors with those of scattered continuum associated with the low- mass protostar L 1527, modeled scattered continuum in cavities, shocked emission associated with low- mass protostars, modeled H2 emission for thermal and fluorescent cases, and modeled polycyclic aromatic hydrocarbon (PAH) emission. Of the emission mechanisms discussed above, scattered continuum provides the simplest explanation for the observed linear correlation. In this case, the color variation within each object is attributed to different foreground extinctions at different positions. Alternative possible emission mechanisms to explain this correlation may be a combination of thermal and fluorescent H2 emission in shocks, and a combination of scattered continuum and thermal H2 emission, but detailed models or spectroscopic follow- up are required to investigate this possibility further. Our color- color diagrams also show possible contributions from PAHs in two objects. However, none of our samples show clear evidence for PAH emission directly associated with the high- mass protostars, several of which should be associated with ionizing radiation. This suggests that these protostars are heavily embedded even at mid- infrared wavelengths.</P>

Robust Stability and Robust Performance of PID + Q Controller and its Application to a Robot Manipulator

Takami Matsuo,Haruo Suemitsu,Shuichi Fujiwara 대한전자공학회 1998 ITC-CSCC :International Technical Conference on Ci Vol.- No.-

Phosphodiesterase inhibitors stimulate osteoclast formation via TRANCE/RANKL expression in osteoblasts: possible involvement of ERK and p38 MAPK pathways

Takami, Masamichi,Cho, Eun Sook,Lee, Soo Young,Kamijo, Ryutaro,Yim, Mijung Elsevier 2005 FEBS letters Vol.579 No.3

<P><B>Abstract</B></P><P>Phosphodiesterases (PDEs) are enzymes that degrade intracellular cAMP. In the present study, 3-isobutyl-1-methylxanthine (IBMX) and pentoxifylline, PDE inhibitors, induced osteoclast formation in cocultures of mouse bone marrow cells and calvarial osteoblasts. These inhibitors induced the expression of the osteoclast differentiation factor, TNF-related activation induced cytokine (TRANCE, identical to RANKL, ODF, and OPGL), in calvarial osteoblasts. IBMX induced phosphorylation of extracellular signal-regulated kinase (ERK) and p38 mitogen-activated protein kinase (MAPK) in osteoblasts. Induction of TRANCE expression by IBMX was partially suppressed by the inhibitors of protein kinase A (PKA), ERK, and p38 MAPK, suggesting that activation of ERK and p38 MAPK, as well as PKA, is involved in TRANCE expression by IBMX. Osteoblasts expressed PDE4, a PDE subtype, and rolipram, a selective inhibitor of PDE4, induced TRANCE expression. These results suggest that PDE4 is a key regulator of TRANCE expression in osteoblasts, which in turn controls osteoclast formation.</P>

Robust Current Control for Permanent Magnet Synchronous Motors by the Inverse LQ Method - An Evaluation of Control Performance Using Servo-Locks at Low Speed -

Takami Hiroshi The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.4

This paper describes the optimal current-control of a permanent magnet synchronous motor by the use of robust and simple current controllers, based upon the analytical procedure known as the inverse LQ (ILQ) design method. The ILQ design method is a strategy for finding the optimal gains based on pole assignment without solving the Riccati equation. It is very important to keep the motor in robust servo-lock. By experiments and simulations, we will show that the ILQ optimal servo-system with servo-lock is more insensitive at low speeds to variations in armature inductance than the standard PI servo-system. Variations in armature inductance have the greatest influence on the responses of a servo-system.

Direct observation of potassium ions in HeLa cell with ion-selective nano-pipette probe

Takami, Tomohide,Iwata, Futoshi,Yamazaki, Koji,Wan Son, Jong,Lee, Joo-Kyung,Ho Park, Bae,Kawai, Tomoji American Institute of Physics 2012 JOURNAL OF APPLIED PHYSICS - Vol.111 No.4

日本における裁判上の離婚原因: 近時の民法改正の動向とともに

( Takami Hayashi ) 아세아여성법학연구소 2001 아세아여성법학 Vol.4 No.-

For many centuries in the West, marriage was regarded as virtually indissoluble. Even today, one or two industrial countries do not recognize cuvorce. Yet these are now isolated examples. Most countries have moved rapidly cowards miling divorce more easily available, No faulr divorce laws were introduced in some countries in the mid-1960s. Since tben many western states have followed suit, although the details vary. The Japanese Divorce Law was strictly fault-based before the commencement of the Family Reform Act of 1947. The Divorce Law was built around the notion chat one spouse was guilty of a matrimonial offence. However, the Family Reform Act of 1947 is based on the no-fault principle. The grounds for divorce are adultery, desertion unknown whereabouts for more than three years, disease of the mind, or other circumstances that prevent the parties from maintaining the matrimonial bond (An. 770 Civil Code Section 1). The latter three grounds ilIustrare the no-fault principle. The former two are regarded as typical examples of rhe dissolution of the marriage bond in Japanese Law, bur not as fault grounds. Even if one of the above-mentioned grounds for divorce exists, a petition can be dismissed, because Arc.770 Civil Code Section 2 prescribes dismissal, if ir appears ro the coure thar the matrimonial bond should be kept. This Ankle has been criricized for giving judges almost unlimited discretion to determine whether to grant the petition for divorce. For many years, a petition for divorce by a guilty spouse was not permitted in Japan. In 1987, the Supreme coutt changed this doctrine and concluded that a marriage that has irretrievably broken down should be brought to end. The dissolution, however, will include the conditions to prevent Dot resulc in grave financial, mental, or social hardship for the espondenc and chijdten. In 1996 the Reform Family Act Biu was introduced. In relation to divorce, It attempts to make che no-faulc pcinciple consiscent. Nociceable changes are the adoption of a new ground, living aparc for five years and a hardship bar. The five years separacion provision plays an impoccant role as an objective measure of irretrievable breakdowd and eliminates the need for expose cheir private lives for proof of cerrain marital breakdown. The Hardship bar will certainly help innocenc respondentS. However, in che usual casc, the financial hardship should be solved with distribution of property on divocce. Mental hardship, on the other hand, is often unavoidable in any divorce. So, a petition should not be easily dismissed. Excessive applicacion of the hardship bar will lead to a tevctsion co the former fault ptinciple. I think the duty of divorce law is not co help an innocenc spouse by maincaining an already-desccoyed marical bond, buc racher co bring an end to such a bond and to procect cbe respondent and children financially and socially. Regrettably, however, institutions fot financial and social support (both public and private) are not sufficient. The Reform Ace Bill of L996 has no provisions co cure chis deficiency. Inscead, ic has chosen a way to dismiss a petition for divotce under a hardship bar. The Reform Act Bill has faced a difficulr time and has noe yet been laid before the earire Diee.

Text and illustration in the margin of late medieval manuscripts

( Takami Matsuda ) 연세대학교 인문학연구원 2015 人文科學 Vol.103 No.-

Medieval manuscripts are often illustrated but miniatures that accompany the text are not the only type of illustration. Images are often inserted as historiated initials or fill the margin of the page as a border decoration. Such marginal images are now studied in terms of both literary history and the history of the book. This essay surveys several examples of such images, especially those of fantastical creatures and hybrid figures known as chimera in the Middle Ages. The possible interaction between the text and such images are discussed with special reference to the Queen Mary’s Psalter and the Luttrell Psalter. It will also be pointed out that in the 15th and early 16th century, as the Book of Hours becomes increasingly popular in both manuscript and print, such images in the margin lose subversive potential and are used frequently as a decorative motif, devoid of the original sense of wonder.

Pharmacologic and Regenerative Cell Therapy for Spinal Cord Injury: WFNS Spine Committee Recommendations

Toshihiro Takami,Nobuyuki Shimokawa,Jutty Parthiban,Mehmet Zileli,Sheena Ali 대한척추신경외과학회 2020 Neurospine Vol.17 No.4

This is a review article examining the pharmacologic and regenerative cell therapy for spinal cord injury. A literature search during last 10 years were conducted using key words. Case reports, experimental (nonhuman) studies, papers other than English language were excluded. Up-to-date information on the pharmacologic and regenerative cell therapy for spinal cord injury was reviewed and statements were produced to reach a consensus in 2 separate consensus meeting of WFNS Spine Committee. The statements were voted and reached a consensus using Delphi method. Pharmacologic and regenerative cell therapy for spinal cord injury have long been an interest of many experimental and clinical researches. Clinical studies with methylpredinisolone have not shown clear cut benefit. Other drugs such as Rho inhibitor, minocycline, riluzole, granulocyte colony-stimulating factor have also been tried without significant benefits. Regenerative cell therapy using different types of stem cells, different inoculation techniques, and scaffolds have undergone many trials highlighting the efficacies of cells and their limitations. This review article summarizes the current knowledge on pharmacologic and regenerative cell therapy for spinal cord injury. Unfortunately, there is a need for further experimental and human trials to recommend effective pharmacologic and regenerative cell therapy.

Spine Surgeons Are Facing the Great Challenge of Contributing to the Realization of a Society of Health and Longevity

Toshihiro Takami 대한척추신경외과학회 2019 Neurospine Vol.16 No.4

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