• Title, Summary, Keyword: order structure

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A Study On Order Structure of SERVPERVAL's 5 Dimensions

  • Cho, Yoon-Shik;Lee, Mi-Ock
    • Journal of the Korean Data and Information Science Society
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    • v.18 no.3
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    • pp.705-711
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    • 2007
  • This Paper has adapted SERVPERVAL scale so that hotel manager can use it to determine how customers perceive the service Quality in hotel. A considerable amount of research has focused on the dimensionality of service quality construct. As later found with the generic SERVQUAL, tangible was the most important out of the 5 dimensions. Listed in descending order of importance to hotel customers, the orders of the other 4 dimensions are assurance, reliability, responsiveness, and empathy. But there was order structure in SERVPERVAL's 5 dimensions. Order structure of 5 dimensions is divided by 3 order groups because there was same order among the 5 dimensions.

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The design of variable structure controller for the systems having the first order dynamic (일차 dynamic을 갖는 계통에 대한 가변구조 제어기의 설계)

  • 박귀태;최중경;강윤관
    • 제어로봇시스템학회:학술대회논문집
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    • pp.179-184
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    • 1991
  • This paper will describe the application for variable structure control theory to the first order dynamic system and verify it's robustness. The study on the first order dynamic system control which has been essential part for the control of servo motor (AC, DC) systems has been excluded in the study of variable structure control system(VSCS) because this first order system was not applicable to the previous variable structure control theory. So, for the robustness control of first order dynamic system with variable structure control theory, we propose modified switching function synthesis which guarantees the advantages of conventional VSCS and removes reaching phase which regards as shortcomings in VSCS. And we demonstrate the practical potential of implementation about this theory by simulation results of AC motor variable speed control.

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순서와 위상구조의 관계

  • 홍성사;홍영희
    • Journal for History of Mathematics
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    • v.10 no.1
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    • pp.19-32
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    • 1997
  • This paper deals with the relationship between the order structure and topological structure in the historical point of view. We first investigate how the order structure has developed along with the set theory and logic in the second half of the nineteenth century. After the general topology has emerged in the beginning of the twentieth century, two disciplines of the order theory and topology give each other a great deal of effect for their development via various dualities, compactifications by maximal filter spaces and Alexandroff's specialization order, which form eventually a fundamental setting for the development of the category theory or functor theory.

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PROLONGATIONS OF G-STRUCTURES IMMERSED IN GENERALIZED ALMOST r-CONTACT STRUCTURE TO TANGENT BUNDLE OF ORDER 2

  • Khan, Mohammad Nazrul Islam;Jun, Jae-Bok
    • Journal of the Chungcheong Mathematical Society
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    • v.31 no.4
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    • pp.421-427
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    • 2018
  • The aim of this study is to investigate the prolongations of G-structures immersed in the generalized almost r-contact structure on a manifold M to its tangent bundle T(M) of order 2. Moreover, theorems on Hsu structure, integrability and (${F\limits^{\circ}},\;{{\xi}\limits^{\circ}}{{\omega}\limits^{\circ}}_p,\;a,\;{\epsilon}$)-structure have been established.

Pointwise perfect fuzzy semi-topogenous orders

  • Chung, S.H.
    • Communications of the Korean Mathematical Society
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    • v.10 no.3
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    • pp.689-698
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    • 1995
  • The purpose of this paper is to introduce a new fuzzy semi-topogenous order which agrees with the fuzzy points and investigate some properties of this order and define a fuzzy proximity structure by using this order.

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Investigations on state estimation of smart structure systems

  • Arunshankar, J.
    • Smart Structures and Systems
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    • v.25 no.1
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    • pp.37-45
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    • 2020
  • This paper aims at enlightening the properties, computational and implementation issues related to Kalman filter based state estimation algorithms and sliding mode observers, by applying them for estimating the states of a smart structure system. The Kalman based estimators considered in this work are Kalman filter and information filter and, the sliding mode observers considered are Utkin observer and higher order sliding mode observer. A fourth order linear time invariant model of a piezo actuated beam is used in this work. This structure is embedded with four number of piezo patches, of which two act as sensors, one as disturbance actuator and the other as control actuator. The performance of the state estimation algorithms is evaluated through simulation, for the first two vibrating modes of the piezo actuated structure, when the structure is maintained at first mode and second mode resonance.

Design of a Higher-Order Mode Coupler Using Coaxial-Structure Waveguide for Ku-Band Monopulse Satellite Tracking (Ku대역 모노펄스 위성추적을 위한 동축구조 도파관 고차모드 커플러 설계)

  • Ga, Deuk-Hyeon;Park, Do-Hyun;Song, Choong-Ho;Ahn, Sung-Joon;Jun, Chan-Won;Lee, Jae-Moon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.4
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    • pp.380-386
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    • 2014
  • In this paper, a higher-order mode coupler using coaxial-structure waveguide for Ku-band monopulse satellite tracking is proposed. The proposed higher-order mode coupler is built in a coaxial structure for compactness and weight reduction, making it suitable for mobile tracking systems. The inner circular waveguide of coaxial-structure is used to extract the fundamental mode signal and the high-order mode signal is extracted from the four slots of the outer circular waveguide and then transmitted via given stepped rectangular waveguide structure. The simulated results show that proposed higher-order mode coupler covers 250 MHz(12.75 GHz ~ 13.00 GHz) bandwidth with return loss and insertion loss characteristics. The antenna patterns of fundamental mode and higher-order mode applicable to monopulse tracking are generated successfully. Designed higher-order mode coupler using coaxial waveguide structure for Ku-band is expected to be used for high precision monopulse satellite tracking systems.

Testing the Pecking Order Theory of Fisheries Firms' Capital Structure : Using Financing Deficit (수산기업의 자본조달순서이론 검증:자금부족분 이용)

  • Kim, Sung-Tae;Nam, Soo-Hyun;Hong, Jae-Bum
    • The Journal of Fisheries Business Administration
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    • v.43 no.1
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    • pp.75-85
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    • 2012
  • In this paper, we study the extent to which the pecking order theory of capital structure provides a satisfactory account of the financing behavior of Korean fisheries firms using financing deficit. The major results of this study are as follows. Firstly, we find that the financing deficit is a important factor that explains the pecking order theory of fisheries firms'capital structure. However, the financing deficit does not wipe out the effects of conventional variables. The information in the financing deficit appears to be factored in along with many other things that fisheries firms take into account. Such result is consistent with the result of Frank and Goyal(2003). Secondly, we find that profitability is only one factor explaining the capital structure of fisheries firms among conventional variables when we test the regression of leverage with financing deficit during post IMF period. This result is different from the previous researches of Korean fisheries firms. (Kang and Jeong; 1997, Nam, Lee, and Hong; 2011) Finally, we examine the dynamics of capital structure of Korean fisheries firms firstly. It will allow a more detailed analysis for capital structure determinants for Korean fisheries firms.

A comparative assessment of approximate methods to simulate second order roll motion of FPSOs

  • Somayajula, Abhilash;Falzarano, Jeffrey
    • Ocean Systems Engineering
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    • v.7 no.1
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    • pp.53-74
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    • 2017
  • Ship shaped FPSO (Floating Production, Storage and Offloading) units are the most commonly used floating production units to extract hydrocarbons from reservoirs under the seabed. These structures are usually much larger than general cargo ships and have their natural frequency outside the wave frequency range. This results in the response to first order wave forces acting on the hull to be negligible. However, second order difference frequency forces start to significantly impact the motions of the structure. When the difference frequency between wave components matches the roll natural frequency, the structure experiences a significant roll motion which is also termed as second order roll. This paper describes the theory and numerical implementation behind the calculation of second order forces and motions of any general floating structure subjected to waves. The numerical implementation is validated in zero speed case against the commercial code OrcaFlex. The paper also describes in detail the popular approximations used to simplify the computation of second order forces and provides a discussion on the limitations of each approximation.

High-Performance VLSI Architecture Using Distributed Arithmetic for Higher-Order FIR Filters with Complex Coefficients

  • Tsunekawa, Yoshitaka;Nozaki, Takeshi;Tayama, Norio
    • Proceedings of the IEEK Conference
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    • pp.856-859
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    • 2002
  • This paper proposes a high-performance VLSl architecture using distributed arithmetic for higher-order FIR filters with complex coefficients. For the purpose of realizing high sampling rate with small latency in high-order filters, we apply distributed arithmetic[1]. Moreover, in order to decrease drastically the power dissipation, the structure applying not ROM's but optimum function circuits which we have previously proposed, is utilized[2][3]. However, this structure increases in the number of adders as compared to the conventional structure applying ROM's. In order to realize a more effective method for further higher-order filter, we propose newly an implementation applying two methods which have large effects on the unit using the adders. First , we propose an implementation applying SFAs(Serial Full Adders) and SFSs(Serial Full Subtractors). Second, we propose a structure applying proposed 4-2 adders. Finally, it is shown that the proposed architecture is an effective way to realize low power dissipation and small latency while the sampling rate is kept constant for further higher-order filters with complex coefficients.

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