• Title/Summary/Keyword: Couple analysis

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Tunable Quarter-wave Plate Consisting of Two Phase Retarders and the Design of a Circular Polarizer (두 개의 위상지연판이 중첩된 가변 4분파장 위상지연자 및 원편광자의 설계)

  • Kim, Sang Youl
    • Korean Journal of Optics and Photonics
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    • v.25 no.3
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    • pp.150-154
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    • 2014
  • The conditions under which a composite retarder consisting of two different retardation plates can be operated as a tunable quarter-wave plate are derived. The explicit expressions for the azimuthal angle of a linear polarizer and those of two retardation plates to generate circularly polarized light are presented as a function of retardation angles. Those expressions for the azimuthal angles derived using the Jones matrix formalism are verified as identical to the expressions derived from the analysis of the trajectory on a Poincar$\acute{e}$ sphere. A couple of examples are presented for generating circularly polarized light when two identical retardation plates are used.

The Effect of Service Quality and Value of Five-Star Hotel Services on Behavioral Intentions with the Role of Consumer Satisfaction as Mediator

  • GOELTOM, Vasco Adato H.;KRISTIANA, Yustisia;JULIANA, J.;BERNATO, Innocentius;PRAMONO, Rudy
    • The Journal of Asian Finance, Economics and Business
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    • v.7 no.11
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    • pp.967-976
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    • 2020
  • This study aims to improve knowledge of consumers' decision-making by testing a conceptual model that considers the hotel's service quality and service value toward customers' behavioral intentions using a mediator, which is the role of consumers' satisfaction. The object of this research is five-star hotels, which has become a significant segment of the general hotel industry and is undergoing rapid expansion. This research is a quantitative research using questionnaire as the sampling method answered by people who have stayed at five-star hotels before. The total of 150 valid respondents were used in this study. The collected data was processed by a statistical tool software, Partial Least Square (PLS). The major findings of this research showed that the relations between service quality and service value of five-star hotels do not have significant positive impact on consumers' behavioral intention, nonetheless the mediation analysis shows that customers' satisfaction partially mediates service quality and service value with consumers' behavioral intentions to stay. It means that in this case, consumers' satisfaction has an important role to mediate service value quality and service value. As a result, the study shows that four out of six hypotheses are supported. A couple of recommendations are suggested for further research.

An Improvement on Robust $H{\infty}$ Control for Uncertain Continuous-Time Descriptor Systems

  • Lee Hung-Jen;Kau Shih-Wei;Liu Yung-Sheng;Fang Chun-Hsiung;Chen Jian-Liung;Tsai Ming-Hung;Lee Li
    • International Journal of Control, Automation, and Systems
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    • v.4 no.3
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    • pp.271-280
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    • 2006
  • This paper proposes a new approach to solve robust $H{\infty}$ control problems for uncertain continuous-time descriptor systems. Necessary and sufficient conditions for robust $H{\infty}$ control analysis and design are derived and expressed in terms of a set of LMIs. In the proposed approach, the uncertainties are allowed to appear in all system matrices. Furthermore, a couple of assumptions that are required in earlier design methods are not needed anymore in the present one. The derived conditions also include several interesting results existing in the literature as special cases.

On the Vibration Analysis of the Floating Elastic Body Using the Boundary Integral Method in Combination with Finite Element Method

  • K.T.,Chung
    • Bulletin of the Society of Naval Architects of Korea
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    • v.24 no.4
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    • pp.19-36
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    • 1987
  • In this research the coupling problem between the elastic structure and the fluid, specially the hydroelastic harmonic vibration problem, is studied. In order to couple the domains, i.e., the structural domain and the fluid domain, the boundary integral method(direct boundary integral formulation) is used in the fluid domain in combination with the finite element method for the structure. The boundary integral method has been widely developed to apply it to the hydroelastic vibration problem. The hybrid boundary integral method using eigenfunctions on the radiation boundaries and the boundary integral method using the series form image-functions to replace the even bottom and free surface boundaries in case of high frequencies have been developed and tested. According to the boundary conditions and the frequency ranges the different boundary integral methods with the different idealizations of the fluid boundaries have been studied. Using the same interpolation functions for the pressure distribution and the displacement the two domains have been coupled and using Hamilton principle the solution of the hydroelastic have been obtained through the direct minimizing process. It has become evident that the finite-boundary element method combining with the eigenfunction or the image-function method give good results in comparison with the experimental ones and the other numerical results by the finite element method.

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Perceived Health Status, Health Behavior, and Marital Satisfaction in Married Immigrant Women (여성 결혼이민자의 주관적 건강상태, 건강행위 실천, 결혼만족도)

  • Kim, Gwang-Suk;Moon, Sun-Sook
    • Journal of Korean Public Health Nursing
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    • v.25 no.2
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    • pp.174-186
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    • 2011
  • Purpose: The study examined the correlation of perceived health status, health behaviors, and marital satisfaction in women who have immigrated to Korea through marriage. Method: Data were collected via questionnaires that investigated health status, health behaviors, Korean language ability, characteristics of couple, and marital satisfaction. Three hundred four subjects were selected for a 4-month period. The data of 300 subjects were analyzed using descriptive analysis, t-test, ANOVA, and correlation, after four questionnaires were excluded due to incomplete data. Results: Perceived health status varied significantly according to nationality, existence of religion, and period of immigration. The scores for perceived health status among women who had lived in Korea for more than 5 years were lower than for women who had resided for 1-3 years. There was a significant positive correlation between health status and health behavior, and health status and Korean language ability, but a negative correlation between health status and age. Conclusion: A program for the improvement of health in immigrant women should include communication assistance as their mother language and should provide periodic health screening.

Experimental Vapor-Liquid Equilibra for $CO_2/Oil$ Systems in the Range of Compressor Working Pressure (압축기 작동압력 범위에서 $CO_2$/오일 시스템의 기-액 상평형 실험)

  • Lee, Chi-Seok;Lee, Kyoung-Youl;You, Han-Yeon;Kang, Byung-Ha;Park, Kyoung-Kuhn
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.3
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    • pp.213-219
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    • 2007
  • An experimental apparatus was constructed to obtain vapor-liquid equilibrium data for $CO_2/oil$ mixtures using mass analysis method with sample cylinder. Lubricants employed were POE (poly-ol ester) and PAG (poly alkylene glycol). The phase equilibria of $CO_2/oil$ mixtures prevailed in an equilibrium cell were observed through a couple of sight glasses at the opposite ends. Data were obtained over the temperatures $-10^{\circ}C,\;-5^{\circ}C,\;0^{\circ}C,\;5^{\circ}C,\;10^{\circ}C,\;25^{\circ}C,\;40^{\circ}C,\;60^{\circ}C,\;and\;80^{\circ}C$ under pressures up to 14 MPa and then mole fractions were calculated, respectively In general, more solubility of $CO_2$ is observed in POE than in PAG. Miscibility gap is closed for $CO_2/POE$ mixture but not for $CO_2/PAG$.

The Function of Computer Utilization in Educating and Researching Ocean Engineering Problems

  • Koo, Weon-Cheol;Kim, Moo-Hyun;Ryu, Sam
    • Journal of Ship and Ocean Technology
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    • v.12 no.4
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    • pp.1-6
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    • 2008
  • Nowadays, the computational capability and graphical power based on PCs increase very rapidly every year. As a result, the complicated engineering or scientific problems that could have only been handled by supercomputers a couple of decades ago can now be routinely run on PCs. Besides, the PCs can be assembled in parallel to increase its computational capability theoretically without limitation. The Web-based interface and communication tools are also being enhanced very rapidly and the real-time distance learning (E-Learning) and project cooperation on web get increasing attention. Using the-state-of-the-art computational method, a number of complicated and computationally intensive problems are being solved by PCs. The results can be well demonstrated on screen by graphics and animation tools. Those examples include the simulations of fully nonlinear waves, their interactions with floating bodies, global-motion analysis of multi-unit floating production system including complicated mooring lines and risers. Several examples will be presented in this regard. Also, Web and java-applet based educational tools have been developed at Texas A&M University for better understanding of waves and wave-body interactions. The background and examples of such Web-based educational tools published in Kim et al. (2003) are briefly introduced here.

Maternal Parenting Stress of Infants from Different Income Groups : The Relative Importance of Father Involvement, the Marital Relationship, and Meanings of Parenthood (가구소득에 따른 부부관계와 자녀가치 및 아버지의 양육참여가 영아기 어머니의 양육스트레스에 미치는 영향력 비교 연구)

  • Ok, Kyung-Hee;Chun, Hui-Young
    • Korean Journal of Child Studies
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    • v.33 no.1
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    • pp.205-221
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    • 2012
  • The purpose of this study was to examine effects of father involvement, marital happiness and conflicts, and meanings of parenthood on maternal parenting stress and compare the relative importance of those variables in three (low, middle, and upper) income groups. The subjects of this study were 654 nuclear families which consisted of 3 family members, couple and their infant children aged between 4 months and 10 months. Data was taken from the 2008 Panel Data of Korean Children. The results of this study were as follows : First, maternal parenting stress, father involvement, mother's marital satisfaction and conflicts were statistically significant according to income levels. Second, mother's marital satisfaction was the most significant variable in predicting father involvement, and mother's marital conflict was the most significant one in predicting maternal parenting stress. Third, the significance and numbers of variables which were impacted upon maternal parenting stress and father involvement varied according to income groups. Fourth, in all three income groups, the effects of father involvement on maternal parenting stress was not significant when marital relationship and meanings of parenthood underwent in regression analysis. However, father involvement was impacted upon maternal parenting stress by itself.

The Design and Implementation of Computer Game Menu & Analysis of Computer Game in Korea (컴퓨터 게임의 분석과 게임 메뉴의 설계 및 구현)

  • Lee Chang-Jo
    • Management & Information Systems Review
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    • v.7
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    • pp.53-68
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    • 2001
  • In this paper, Computer Games is still going strong. We are still making incremental improvements to the computer game, mobile game, but it seems to have settled into a fairly standard version and layout. Many games have passed through our life over the past couple of years. A number of the best have been written about in these games. Unfortunately there are too many games and too little time, and make some hard choices about what games actually play regularly. This is obviously a very personal list of favorite games, and change fairly regularly as new games rotate in and old games are given a rest for a while. It brings ours to the question of what we look for in a game, and why choose one game to play over another? What does make a game good enough to play time after time? Therefore, a game has to have, above all, interesting tactics and strategy, but also we like originality and simplicity. There is also a certain quality that is very difficult to define that makes some games beautiful. At last in this issue we return to mobile oriented games. This paper will discuss Computer Game Conditions in terms of the different games, components, and Design amd Implementation of Computer Game Menu Simulation based on 4GL, PowerBuilder.

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Investigation of rotational characteristics of column 'PINNED' bases of steel portal frames

  • Liu, Timothy Chi-Ho
    • Steel and Composite Structures
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    • v.1 no.2
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    • pp.187-200
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    • 2001
  • Most of the portal frames are designed these days by the application of plastic analysis, with the normal assumption being made that the column bases are pinned. However, the couple produced by the compression action of the inner column flange and the tension in the holding down bolts will inevitably generate some moment resistance and rotational stiffness. Full-scale portal frame tests conducted during a previous research program had suggested that this moment can be as much as 20% of the moment of resistance of the column. The size of this moment of resistance is particularly important for the design of the tensile capacity of the holding down bolts and also the bearing resistance of the foundation. The present research program is aiming at defining this moment of resistance in simple design terms so that it could be included in the design of the frame. The investigation also included the study of the semi-rigid behaviour of the column base/foundation, which, to a certain extent, affects the overall loading capacity and stiffness of the portal frames. A series of column bases with various details were tested and were used to calibrate a finite element model which is able to simulate the action of the holding down bolts, the effect of the concrete foundation and the deformation of the base plate.