ADAPTIVE POSITION CONTROL OF PERMANENT MAGNET SYCHRONOUS MOTORS

Seta BOGOSYan,Metin GOKASAN,Serhat IKIZOGLU 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10

Permanent magnet synchronous motors (PMSM) are prime candidates for high performance applications like direct drive robotics and other precision systems. With the availability of improved power electronics systems and digital signal processors at reduced cost, it has been quite common to seek higher performance levels for those systems. Especially for direct dnve applications, the variations in system parameters and the payload necessitate sophisticated control methods for their compensation. This study is about the implementation of a digital signal processor (DSP) based adaptive technique for the position control of a PMSM system, actuating a single link manipulator. The obtained experimental results indicate the success of the control method in that the system tracks the desired trajectory with minimum error under inertia and load variations with no a priori knowledge of real parameters.

Management Of Forensic Science in Japan

Sueshige Seta 한국법과학회 2000 한국법과학회 학술대회 Vol.2000 No.1

Wood Physical and Mechanical Properties of Clonal Teak (Tectona grandis) Stands Under Different Thinning and Pruning Intensity Levels Planted in Java, Indonesia

( Gama Widya Seta ),( Fanny Hidayati ),( Widiyatno ),( Mohammad Na’iem ) 한국목재공학회 2023 목재공학 Vol.51 No.2

The objective of this study was to reveal the impact of thinning and pruning regimes on the physical and mechanical properties of clonal teak wood planted in Java. In this study, a 15-year-old clonal teak plantation was carried out and the obtained data were evaluated with analysis of variance (ANOVA). The results showed that different thinning intensities had a significant impact on the alteration of heartwood volume development (F = 25.63; p < 0.0001). Meanwhile, the impact of different thinning treatments in several physical properties depends on the pruning treatment levels [moisture content (F = 12.18, p < 0.0001); tangential shrinkage (F = 15.60, p < 0.0001); T/R ratio (F = 7.17, p < 0.0001); and volumetric shrinkage (F = 10.81, p < 0.0001)]. However, different thinning intensities had no significant impact on wood basic density alteration (F = 0.72, p = 0.486), while pruning intensities affect the differences between radial (F = 3.52, p = 0.030) and volumetric shrinkage (F = 3.13, p = 0.044). In mechanical properties, thinning intensity levels did not promote any significant differences [modulus of elasticity (F = 1.41, p = 0.248); modulus of rupture (F = 0.94, p = 0.392); compressive strength parallel to grain (F = 0.21, p = 0.813); and compressive strength perpendicular to the grain (F = 0.41, p = 0.669)]. Meanwhile, different pruning treatments and combination treatments were not significantly altered all mechanical properties. These results indicated that the thinning and pruning regimes can enhance the mechanical properties without having a serious alteration in the physical properties of clonal teak wood.

Impact of thinning and pruning on tree growth, stress wave velocity, and pilodyn penetration response of clonal teak (Tectona grandis) plantation

Gama Widya Seta,Widiyatno,Fanny Hidayati,Mohammad Naiem 한국산림과학회 2021 Forest Science And Technology Vol.17 No.2

The objective of this research was to examine the impact of different thinning and pruning intensities on the growth characteristics and wood properties of clonal teak. A 14-year-old clonal teak plantation was used in the study. The first thinning and pruning were established 5 years after planting. Three different levels of thinning (un-thinned, moderate, and heavy) and pruning (low, medium, high) were tested. Growth characteristics, pilodyn penetration, and stress wave velocity were examined. Results showed that different thinning intensities significantly affected the mean annual diameter increment (F = 37.67; p < 0.01). The standing stock estimations of the thinning intensity regimes also significantly differed between different thinning intensities (F = 4.16; p = 0.035). Moreover, pilodyn penetration significantly varied with the thinning treatment (F = 23.53; p < 0.01). The stress wave velocity, however, did not significantly vary with the thinning treatment (F = 2.54; p = 0.11). Meanwhile, the effect of pruning treatment was not observed under all parameters. Heavy thinning treatment promoted all parameters except height and stress wave velocity. A strong positive correlation was observed between pilodyn penetration and DBH. This result suggested that thinning and pruning promoted positive DBH growth and an increase in the economic value of the stand, but it did not affect the wood properties of clonal teak wood.

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에그 에 세타(Egue y Seta),비쿠고 스튜디오(사진) 현대건축사 2017 (월간)Maru Vol.- No.189

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에그 에 세타(Egue y Seta),비쿠고 스튜디오(사진) 현대건축사 2017 마루 Vol.- No.189

HYDROPLANING ANALYSIS BY FEM AND FVM - EFFECT OF TIRE ROLLING AND TIRE PATTERN ON HYDROPLANING

Nakajima, Y.,Seta, E.,Kamegawa, T.,Ogawa, H. The Korean Society of Automotive Engineers 2000 International journal of automotive technology Vol.1 No.1

The new numerical procedure for hydroplaning has been developed by considering the following three important factors; fluid/structure interaction, tire rolling, and practical tread pattern. The tire was analyzed by FEM with Lagrangian formulation and the fluid is analyzed by FVM with Eulerian formulation. Since the tire and the fluid are modeled separately and their coupling is automatically computed by the coupling element, the fluid/structure interaction of the complex geometry such as the tire with the tread pattern can be analyzed practically. We verified the predictability of the hydroplaning simulation in the different parameters such as the water flow, the velocity dependence of hydroplaning, and the effect of the tread pattern on hydroplaning. In order to predict the streamline in the contact patch, the procedure of the global-local analysis was developed. Since the streamline could be predicted by this technology, we could develop the new pattern in a short period based on the principle; "make the stream line smooth".

HYDROPLANING ANALYSIS BY FEN AND FVM:EFFECT OF TIRE ROLLING AND TIRE PATTERN ON HYDROPLANING

Y. NAKAJIMA,E. SETA,T. KAMEGAWA,H. OGAWA 한국자동차공학회 2000 International journal of automotive technology Vol.1 No.1

The new numerical procedure for hydroplaning has been developed by considering the following three important factors; fluid/structure interaction, tire rolling, and practical tread pattern. The tire was analyzed by FEM with Lagrangian formulation and the fluid is analyzed by FVM with Eulerian formulation. Since the tire and the fluid arc modeled separately and their coupling is automatically computed by the coupling element. the fluid/structure interaction of the complex geometry such as the tire with the tread pattern can be analyzed praetically. We verified the predictability of the hydroplaning simulation in the different parameters such as the water flow, the velocity dependence of hydroplaning. and the effect of the tread pattern on hydroplaning. In order to predict the streamline in the contact patch. the procedure of the global-local analysis was developed. Since the streamline could be predicted by this technology, we could develop the new pattern in a short period based on the principle; "make the stream line smooth",<br/>

Guidance Generation for Facilitating Meta-Cognitive Learning through Presentation Task

Hiroshi Maeno,Kazuhisa Seta 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-

It is quite important to build an HCI scheme that can encourage humans' intellectual activities. Needless to say, learning activity is one of the most intellectual one. In this paper, we'll discuss computer assisted learning for facilitating meta-cognitive learning as an example of such a promising HCI scheme. Meta-cognition plays an important role in acquiring and transferring expertise. Although we recognize the necessity of building a learning scheme for developing meta-cognitive skills, little knowledge for it has been acquired because it is difficult for learners and instructors to discuss meta-cognitive skills as learning topics: the knowledge for performing meta-cognitive skills is tacit, latent, and context-dependent. Our goal is to build a new learning scheme to support meta-cognitive learning. In this paper, firstly, we describe an overview of our learning support system. Secondly, we illustrate learning strategies in learning software design patterns, and then, propose the function of generating guidance information to facilitate acquiring such meta-cognitive learning strategies.

Effect of Improved Planting Stock on Tree Growth, Wood Properties, and Soil Fertility of Teak Plantations 10 Years After Planting

Widiyatno,Aris Wibowo,Dian Novitasari,Gama Widya Seta,Daryono Prehaten,Fanny Hidayati,Widyanto Dwi Nugroho,Suryo Hardiwinoto,Mohammad Naiem,Naoki Tani 한국산림과학회 2024 Forest Science And Technology Vol.20 No.1

Teak (Tectona grandis Linn. f.) is one of the most economically valuable types of tropical forest because teak wood has high durability, resilience and good aesthetic qualities. Teak tree improvement in Indonesia was initiated in 1983 producing planting stock for reforestation, i.e. clonal seed orchards (CSO) to produce seedling as sexual reproduction (referred to seedling), and hedge orchards to produce shoot cuttings as asexual (vegetative) reproductive (referred to shoot cuttings). Teak plantations established using seedling and shoot cuttings should improve forest productivity. The objectives of this study were to compare the growth rate, wood properties, and soil fertility of teak plantations propagated using seedling and shoot cuttings. Three square plots of 100 trees (10�10 trees; 1,000 m2) were established on both types of plantation and tree growth characteristics, wood properties, and soil fertility were monitored. The tree growth characteristics were diameter at breast height (DBH), tree height (H), clear bole height (CB), and volume of standing stock (Vss), and the wood properties included pilodyn penetration (PP) and stress wave velocity (SWV). Soil fertility was assessed from soil samples collected from three soil depths, with three replicates in each plot: 0–5 cm (top layer), 6–30 cm (middle layer), and 31–60 cm (bottom layer). Soil samples were analysed for total nitrogen, total phosphorus, total potassium, total calcium, and total magnesium. The results showed that the mean DBH, H, CB, and Vss differed significantly between the type of planting stock. The DBH, H, CB, and Vss values were 28.4%, 46.8%, 49.1%, and 130.1% higher, respectively, in teak plantations from shoot cuttings than from seedling. Moreover, the SWV of shoot cuttings planting stock plantation was 3.6% higher than from seedling. The mean PP did not differ significantly between teak plantations from shoot cuttings (22.00 mm) and seedling (21.80 mm). Furthermore, the planting stock did not affect soil fertility, which was highest in the top layer in all treatments. Our results suggest that teak plantations from shoot cuttings would increase growth, forest productivity, maintaining wood quality and soil fertility. Thus, it can maintain sustainable teak forest plantations.