• 제목/요약/키워드: S-T Method

검색결과 7,130건 처리시간 0.047초

ON BAYESIAN ESTIMATION AND PROPERTIES OF THE MARGINAL DISTRIBUTION OF A TRUNCATED BIVARIATE t-DISTRIBUTION

  • KIM HEA-JUNG;KIM Ju SUNG
    • Journal of the Korean Statistical Society
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    • 제34권3호
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    • pp.245-261
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    • 2005
  • The marginal distribution of X is considered when (X, Y) has a truncated bivariate t-distribution. This paper mainly focuses on the marginal nontruncated distribution of X where Y is truncated below at its mean and its observations are not available. Several properties and applications of this distribution, including relationship with Azzalini's skew-normal distribution, are obtained. To circumvent inferential problem arises from adopting the frequentist's approach, a Bayesian method utilizing a data augmentation method is suggested. Illustrative examples demonstrate the performance of the method.

T-S형 퍼지제어기의 후건부 멤버십함수 동조방법 (The Tuning Method on Consequence Membership Function of T-S Type FLC)

  • 최한수;이경웅
    • 제어로봇시스템학회논문지
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    • 제17권3호
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    • pp.264-268
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    • 2011
  • This paper presents a Takagi-Sugeno (T-S) type Fuzzy Logic Controller (FLC) with only 3 rules. The choice of parameters of FLC is very difficult job on design FLC. Therefore, the choice of appropriate linguistic variable is an important part of the design of fuzzy controller. However, since fuzzy controller is nonlinear, it is difficult to analyze mathematically the affection of the linguistic variable. So this choice is depend on the expert's experience and trial and error method. In this paper, we propose the method to choose the consequence linear equation's parameter of T-S type FLC. The parameters of consequence linear equations of FLC are tuned according to the system error that is the input of FLC. The full equation of T-S type FLC is presented and using this equation, the relation between output and parameters can represented. The parameters are tuned with gradient algorithm. The parameters are changed depending on output. The simulation results demonstrate the usefulness of this T-S type 3 rule fuzzy controller.

하중 적분 PDC와 T-S 퍼지 외란 관측기를 이용한 이동 로봇의 강인 궤도 추적 제어 (Robust Trajectory Tracking Control of a Mobile Robot Based on Weighted Integral PDC and T-S Fuzzy Disturbance Observer)

  • 백두산;윤태성
    • 한국정보통신학회논문지
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    • 제21권2호
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    • pp.265-276
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    • 2017
  • 본 논문에서는 하중 적분 PDC 제어 기법과 T-S 퍼지 외란 관측기를 이용한 강인하면서도 보다 정확한 이동 로봇의 궤도 추적 제어 방법을 제안한다. 하중 적분 PDC 제어 기법은 PDC 제어 기법에 하중 적분 항을 추가함으로써 정상상태 오차를 감소시켜 준다. T-S 퍼지 외란 관측기는 T-S 퍼지 모델로 표현된 비선형 시스템에 대해 외란을 추정하고 상쇄시킬 수 있도록 한다. 따라서, T-S 퍼지 외란 관측기에 기반한 궤도 추적 제어기는 강인한 궤도 추적 성능을 보여준다. 또한, 본 연구에서는 $B\acute{e}zier$ 곡선에 의한 가속도 제한을 갖는 경로 설계 방법에 의해 초기 접근 경로를 설계함으로써, 이동 로봇의 초기 위치가 기준 궤도의 초기 위치와 다를 때 제어 입력이 매우 커지게 되어 실제적으로 사용할 수 없게 되는 문제를 해결한다. 제안된 궤도 추적 제어기의 성능을 시뮬레이션을 통해서 입증하였다.

한전 765 kV 송전선로 애자장치 강도계열 및 지지방식에 관한 검토 (A study on the mechanical strength system and supporting method of insulator strings for KEPCO 765kV transmission lines)

  • 한엽;박광희;윤상훈;서철수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 C
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    • pp.1920-1922
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    • 1996
  • After determining the type and string condition of conductor of 765kV transmission lines, we studied the mechanical strength system of insulator strings to support conductors and insulate conductors from towers. In this paper, for the insulator strings which will be used in 765kV transmission lines, we're going to optimally determine the mechanical strength system and supporting method in the consideration of the reliability, economics and the survey data of T/L routes, and also suggest the calculation method to stipulate for the application limits of suspension and strain insulator strings according to the loadspan and height difference of tower.

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Linearization of T-S Fuzzy Systems and Robust Optimal Control

  • Kim, Min-Chan;Wang, Fa-Guang;Park, Seung-Kyu;Kwak, Gun-Pyong;Yoon, Tae-Sung;Ahn, Ho-Kyun
    • Journal of information and communication convergence engineering
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    • 제8권6호
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    • pp.702-708
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    • 2010
  • This paper proposes a novel linearization method for Takagi.sugeno (TS) fuzzy model. A T-S fuzzy controller consists of linear controllers based on local linear models and the local linear controllers cannot be designed independently because of overall stability conditions which are usually conservative. To use linear control theories easily for T-S fuzzy system, the linearization of T-S fuzzy model is required. However, The linearization of T-S fuzzy model is difficult to be achieved by using existing linearization methods because fuzzy rules and membership functions are included in T-S fuzzy models. So, a new linearization method is proposed for the T-S fuzzy system based on the idea of T-S fuzzy state transformation. For the T-S fuzzy system linearized with uncertainties, a robust optimal controller with the robustness of sliding model control(SMC) is designed.

S-PBL의 연계순서에 따른 간호대학생의 학습성과 비교: 무작위 교차설계 (A Comparative Study on Learning Outcomes according to the Integration Sequences of S-PBL in Nursing Students: Randomized Crossover Design)

  • 윤소영;최자윤
    • 대한간호학회지
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    • 제49권1호
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    • pp.92-103
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    • 2019
  • Purpose: This study aimed to compare the effects of simulation integrated with problem based learning (S-PBL) according to the sequences of problem-based learning (PBL) and high fidelity simulation training (HFS) on knowledge, clinical performance, clinical judgment, self-confidence, and satisfaction in fourth-grade nursing students. Methods: In this randomized crossover design study, four S-PBLs on medical-surgical nursing were applied alternatively to two randomly-assigned groups of 26 senior nursing students for 8 weeks. The collected data were analyzed using an independent t-test. Results: The method of administering PBL prior to HFS led to significantly higher scores on knowledge (t=2.28, p=.025) as compared to the method of administering HFS prior to PBL. However, the latter method led to significantly higher scores on clinical performance (t=-6.49, p<.001) and clinical judgment (t=-4.71, p<.001) as compared to the method of administering PBL prior to HFS. There were no differences in the effect of the two methods on self-confidence (t=1.53, p=.128) and satisfaction (t=1.28, p=.202). Conclusion: The integration sequences of S-PBL was associated with different learning outcomes. Therefore, when implementing S-PBL, it is necessary to consider the educational goal to executes an appropriate sequence of integration.

과학기술인의 종합복지 향상방안 : 과학기술인 종합복지타운 건립을 중심으로 (How to Improve the Welfare of Science & Technology Personnel : Based on the Comprehensive Welfare Town for S&T Personnel)

  • 이종민;임상현;정선양
    • 기술경영경제학회:학술대회논문집
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    • 기술경영경제학회 2006년도 제28회 동계학술발표회 논문집
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    • pp.150-169
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    • 2006
  • Science & Technology (S&T) personnel have played a major role to develop our country since S&T is the most important factor to increase national competitiveness in the 21st century. Therefore, it is very essential to increase the welfare of S&T personnel in order to increase national S&T and economic competitiveness. However, the welfare of S&T personnel has not been discussed sufficiently not only in academic research, but also in actual S&T policies. It has caused many. social problems (for example, avoiding fields of S&T of young generation, low social recognition of S&T community and so on). Under this background, this paper aims at investigating how to effectively improve S&T personnel's welfare. For this purpose, we deal with a theoretical review on the welfare of S&T personnel. After that, we will suggest 'Comprehensive Welfare Town for S&T Personnel' as a method of improving the welfare of S&T personnel.

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하브루타 교수법을 적용한 수업이 간호대학생의 의사소통능력, 비판적 사고능력 및 셀프리더십에 미치는 효과 (The Effect of the Education Applying Havruta's Method on Communication Competency, Critical Thinking Competency, and Self-leadership of Nursing Students)

  • 하재현;이현주
    • 지역사회간호학회지
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    • 제31권3호
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    • pp.337-347
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    • 2020
  • Purpose: The purpose of this study was to construct the education applying Havruta's method for nursing students and to examine its effect on the communication competency, critical thinking competency, and self-leadership. Methods: A non-equivalent control group pretest-posttest design was used. The participants were 138 nursing students at two universities. The experimental group (n=70) received the education applying Havruta's method for six weeks. The study was carried out from September 23 to November 8, 2019. Data were analyzed using IBM SPSS/WIN 22.0 for the 𝑥2 test, Fisher's exact test, and independent t-test. Results: The experimental group had a significant increase in communication competency (t=2.44, p=.016). However, there was no significant difference in critical thinking competency (t=1.85, p=.067), and self-leadership (t=1.78, p=.077) between the two groups. Conclusion: The education applying Havruta's method is an effective nursing education for communication competency. The result of this study could be a guide for nursing professors at the nursing education field when developing education programs that apply Habruta's method. Based on these results, future studies should be conducted to apply Habruta's teaching method to various nursing majors.

유방축소술의 최근 경향 및 수직반흔법과 역T자반흔법의 비교 (Recent Trend of the Reduction Mammaplasty and comparing with Vertical Reduction Method and Inverted T-scar Method)

  • 권기현;임영빈;조명수;신혜경;설정현
    • Archives of Plastic Surgery
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    • 제38권3호
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    • pp.300-308
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    • 2011
  • Purpose: The goal of reduction mammaplasty is breast with natural cone shape, minimizing scars, well-placed and sensate nipple-areolar area and maintaining breast physiology. In order to satisfy that goal, variable reduction mammaplasty methods are performed, however, two methods such as vertical reduction method and inverted T-scar method are currently most used. We compared indications and advantages of the two methods and set up useful guidlines. Methods: For 15 years from 1995 to 2010, we experienced 84 patients (162 breasts). We performed vertical reduction method as Lejour's superior pedicle technique (45 patients) and inverted T-scar method as Goldwyn's inferior dermal flap technique (39 patients). We evaluated the result of the operation comparing patient's age, amount of resected tissue, complications and post-operative scars of the two methods. Results: The mean age was 36 years and the vertical reduction group was 3 years younger than inverted T-scar group. The mean breast tissue resection amount per one breast, inverted T-scar group (712 gm) was lagger than vertical reduction group (395 gm). Conclusion: There is no ideal method for reduction mammaplasty until now. However, we suggest that guide line, the vertical reduction method is effective for minimal and moderate macromastia in young and middle aged women and inverted T-scar method is appropriate for severe macromastia with ptosis in elderly women. Recently, all procedures tried shorter and smaller scar on the vertical line as small I, J or L shape scar, and inframammary fold as short inverted T-scar.

패널코드를 이용한 T-50 형상의 공력특성 예측 및 검증 (AN ANALYSIS OF THE AERODYNAMIC CHARACTERISTICS OF A T-50 CONFIGURATION USING A PANEL CODE AND ITS VALIDATION)

  • 박선욱;김도준;제상언;명노신;조태환
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2006년도 추계 학술대회논문집
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    • pp.131-135
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    • 2006
  • The aerodynamic characteristics of a T-50 aircraft configuration are investigated by a subsonic panel method. Panel methods are best applicable to the lifting surfaces such as wings and airfoils. Source and doublets are used in the present code as a basic singularities of the panel technique. The panel method is first assessed by applying it to several benchmark problems for which other solutions and experimental data are available, such as a swept wing and wing body configuration. The prediction results are compared with experimental data and show good agreement in all cases considered. Finally, the method is applied to a T-50 aircraft configuration and excellent agreement with flight test data in lift coefficients is found.

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