• Title/Summary/Keyword: Linguistic variables

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Fuzzy Sky-hook Control of Semi-active Suspension System Using Rotary MR Damper (회전형 MR 댐퍼를 이용한 반능동 현가장치의 퍼지 스카이-훅 제어)

  • Cho, Jeong-Mok;Joh, Joong-Seon
    • Journal of the Korean Institute of Intelligent Systems
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    • v.17 no.5
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    • pp.701-706
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    • 2007
  • Recently, a number of researches about linear magnetorheological(MR) damper using valve-mode characteristics of MR fluid have sufficiently undertaken, but researches about rotary MR damper using shear-mode characteristics of MR fluid are not enough. In this paper, we performed vibration control of shear-mode MR damper for unlimited rotating actuator of mobile robot. Also fuzzy logic based vibration control for shear-mode MR damper is suggested. The parameters, like scaling factor of input/output and center of the triangular membership functions associated with the different linguistic variables, are tuned by genetic algorithm. Simulation results demonstrate the effectiveness of the fuzzy-skyhook controller for vibration control of shear-mode MR damper under impact force.

Cpk Index Estimation under Tw (the weakest t-norm)-based Fuzzy Arithmetic Operations

  • Hong, Dug-Hun
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.8 no.3
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    • pp.170-174
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    • 2008
  • The measurement of performance of a process considering both the location and the dispersion of information about the process is referred to as the process capacity indices (PCIs) of interest, $C_{pk}$. This information is presented by the mean and standard deviation of the producing process. Linguistic variables are used to express the evaluation of the quality of a product. Consequently, $C_{pk}$ is defined with fuzzy numbers. Lee [Eur. J. Oper. Res. 129(2001) 683-688] constructed the definition of the $C_{pk}$ index estimation presented by fuzzy numbers and approximated its membership function using the "min" - norm based Zadeh's extension principle of fuzzy sets. However, Lee's result was shown to be invalid by Hong [Eur. J. Oper. Res. 158(2004) 529-532]. It is well known that $T_w$ (the weakest t-norm)-based addition and multiplication preserve the shape of L-R fuzzy numbers. In this paper, we allow that the fuzzy numbers are of L-R type. The object of the present study is to propose a new method to calculate the $C_{pk}$ index under $T_w-based$ fuzzy arithmetic operations.

Language as Act and Meaning: Deleuze's and Peirce's Pragmatics (행위로서의 언어와 의미 -들뢰즈와 퍼스의 화행론)

  • Choi, Moonsoo
    • Journal of English Language & Literature
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    • v.55 no.1
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    • pp.199-213
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    • 2009
  • From the perspective of pragmatics, language is a mode of act that works in the order of motive and performs human purpose. The function of language is then primarily performative rather than informational or significative. Pragmatics, however, encounters a tough question: what is the relation of the linguistic act to meaning? Many language theories including pragmatic theories admit the autonomy of meaning while defining language as act. But in Deleuze and Peirce we find examples of maximalist pragmatics that denies the autonomy of meaning. However, Deleuze and Peirce are different in their view on the function of meaning. For Deleuze, language is the transmission of act, what he calls 'order-word.' He rejects meaning except as the minimal condition for the transmission. But his theory turns out to be contradictory in that meaning as the minimal condition is actually the function of constants that he denies for order-words that are always variables. On the contrary, Peirce's pragmatism as a radical pragmatics does not exclude meaning. For him, language is interpretative act serving the purpose of understanding reality, which is performed through the function of meaning and 'habit.' This shows that meaning is indispensable to language even in maximalist pragmatics.

Effect of verbal and nonverbal communication of middle school sports club instructor on trust of instructor and class commitment (중학교스포츠클럽 지도자의 언어적·비언어적 의사소통이 지도자신뢰 및 수업몰입에 미치는 영향)

  • Jang, Chae-ouk;Seo, Soo-Jin
    • Journal of the Korea Convergence Society
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    • v.12 no.8
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    • pp.267-277
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    • 2021
  • This study was done with collected and analyzed data using the convenient sampling method on 349 middle school students located in the metropolitan area in order to verify the effect of instructors verbal and nonverbal communications on instructor trust and class commitment in middle school sports clubs. As a result of analyzing the collected data, First, as a result of correlation analysis using the total number of items between sub-factors of latent variables, all correlation coefficients showed a positive (+) significant relationship. Second, as a result of the effect of verbal and nonverbal communications on instructor trust, it was found that the influence of spatial language, appearance language, body language, and linguistic factors were significantly explained in order. Third, as a result of the effect of verbal and nonverbal communications on class flow, it was found that class commitment was significantly explained in the order of appearance language, spatial language, and linguistic factors. Fourth, as a result of the influence of instructor's trust on class commitment, it was found that only the exercise capacity factor significantly explained class commitment. This study provides basic academic data to plan and create interactions with school sports club instructors and students.

Application of Fuzzy Logic in Scenario Based Language, Learning (시나리오 기반 언어 학습에서 퍼지논리 적용에 관한 연구)

  • Lee, Sang-Hyun;Moon, Kyung-Il;Lee, Sang-Joon
    • Journal of Digital Convergence
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    • v.11 no.2
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    • pp.221-228
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    • 2013
  • A number of research studies focus on the efficacy of using such as scenario based learning. However, desirable methods have not been introduced to assess the scenario based learning. This article is to suggest a fuzzy logic based framework for scenario base learning in which more reasonable learning effects are measured. It can be solved uncertain problems of linguistic variables. Also, we suggest three measures of accuracy, comprehensibility and completeness in order to evaluate accurate effects of scenario based learning. This assessment provides the scenario to the learner in which the scenario is presented in an authentic context, and enable the learner to reach an outcome through an adequate sequence and choices. This approach enables the system to present new scenarios and outcomes based on what a user selects. In particular, the application of fuzzy logic in scenario based learning can be easily pursued certain successful path or wrong path all the way through to reach major outcome in real situation.

A Study on the Expectation and Satisfaction of Parents on Cooking Activity Programs for Children (아동 요리활동 프로그램에 대한 학부모의 기대와 만족에 관한 연구)

  • Yang, Yeo-Jung;Yoon, Hye-Hyun
    • Culinary science and hospitality research
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    • v.20 no.2
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    • pp.152-164
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    • 2014
  • This research attempts to analyze the significant factors that affect the level of expectation and satisfaction of parents on cooking activities for their child(ren) by comparing the levels of their original expectation and satisfaction; based on the understanding of the educational values and effects of cooking activities for children. To conduct the empirical studies, 254 survey samples were collected from the parents who have had their child(ren) participate in cooking activities; in addition, the data was processed and analyzed by using various comparative statistical analysis; including t-test, IPA analysis, regression analysis, one-way ANOVA. And Duncan's multiple test was added to verify the outcome afterwards. As the result of the research, the expectation and satisfaction of parents who let their child(ren) participate in cooking activities were significantly different by such variables as 'improvement of linguistic expression,' 'development of understanding numbers and scientific concepts,' 'extension of capability to give his/her emotional expressions,' 'assistance in soothing his/her psychological stresses.' Besides, 'educational contents and methods' were revealed as another factor that influenced parents' satisfaction, and it is clarified that the level of satisfaction is significantly different according to the organizations offering activity programs.

Comparison of Predictive Performance between Verbal and Visuospatial Memory for Differentiating Normal Elderly from Mild Cognitive Impairment (정상 노인과 경도인지장애의 감별을 위한 언어 기억과 시공간 기억 검사의 예측 성능 비교)

  • Byeon, Haewon
    • Journal of the Korea Convergence Society
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    • v.11 no.6
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    • pp.203-208
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    • 2020
  • This study examined whether Mild Cognitive Impairment (MCI) is related to the reduction of specific memory among linguistic memory and visuospatial memory, and to identify the most predictive index for discriminating MCI from normal elderly. The subjects were analyzed for 189 elderly (103 healthy elderly, 86 MCI). The verbal memory was used by the Seoul Verbal Learning Test. visuospatial memory was measured using the Rey Complex Figure Test. As a result of multiple logistic regression, verbal memory and visuospatial memory showed significant predictive performance in discriminating MCI from normal elderly. On the other hand, when all the confounding variables were corrected, including the results of each memory test, the predictive power was significant in distinguishing MCI from normal aging only in the immediate recall of verbal memory, and the predictive power was not significant in the immediate recall of visuospatial memory. This result suggests that delayed recall of visuospatial memory and immediate recall of verbal memory are the best combinations to discriminate memory ability of MCI.

Development of Fuzzy Inference Systems for Protection to Electrical Accidents of Laboratory (연구실 전기사고방지를 위한 퍼지 추론 시스템 개발)

  • Park, Keon-Jun;Lee, Dong-Yoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.8
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    • pp.3636-3643
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    • 2011
  • To prevent the electrical accidents in the laboratory, we identify problems for periodic inspections of the electric field and develop a fuzzy inference system that can be practically applied to check items. Focusing on electrical safety in the lab environment, we draw check items that can be applied in common and develop a standard checklist that is consistent with the laboratory electrical safety and the periodic inspections. Using the standard checklist we select the items that may contain a linguistic ambiguity and define the membership functions for these items. We also have a safety rating defined by the membership function. Using these fuzzy variables we form the fuzzy rules in the form of 'If-Then' and develop a fuzzy inference system through the fuzzy engine. From this, electrical accidents could be prevented in advance continuously by managing the intelligent and efficient inspection and electrical safety to prevent the electrical accidents in the laboratory.

A Study on the describability of landmarks in route communication using virtual reality (가상현실을 이용한 루트 커뮤니케이션에서의 랜드마크의 설명 용이성(Describability)에 관한 연구)

  • 정진우
    • Archives of design research
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    • v.16 no.2
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    • pp.255-270
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    • 2003
  • The main goal of this study is to find the role of landmarks in route communication process and to explore the describability of landmarks, a linguistic factor of landmarks that was not noted frequently by previous wayfinding studies. Through analysis of landmarks in this study, the describability of landmarks was identified and this study hypothesized that the describability affects to the whole process of route communication. A virtual reality (VR) simulation test was conducted to examine the effect of the describability of landmarks in route communication. The independent variable was the describability of landmarks and landmarks. As dependent variables, the total time to find final destination and the number of errors were measured. Results showed that the describability of landmarks gives positive effect to the whole of route communication processes. Consequently, this study provides the solution of wayfinding problems in route communication and suggests the usage of landmarks as a prerequisite for planning spaces having the efficiency of wayfinding.

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Evaluation of the Korean Version of Physical Activity Scale for the Elderly (K-PASE) (한국판 노인 신체활동 측정도구(Korean version of Physical Activity Scale for the Elderly: K-PASE)의 평가)

  • Choe, Myoung-Ae;Kim, Jeung-Im;Jeon, Mi-Yang;Chae, Young-Ran
    • Women's Health Nursing
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    • v.16 no.1
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    • pp.47-59
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    • 2010
  • Purpose: The purpose of this study was to develop a Korean version of Physical Activity Scale for the Elderly (K-PASE) from PASE and to evaluate the validity and reliability of the K-PASE. This scale was originally developed by Washburn et al. (1993). A valid and reliable physical activity scale for the elderly is needed to assess accurately physical activity of the elderly, because there has been no valid and reliable physical activity scale for the elderly in Korea. Methods: The K-PASE was developed from PASE through linguistic validation and cultural adaptation for use with this population. Convenient sampling was used to recruit participants. Reliability was evaluated by conducting the test-retest and convergent validity was evaluated by Pearson correlation. Results: Test-retest reliability, assessed over a 2 week interval, was r=.94. Convergent validity was established by correlating the KPASE scores between related variables which were the Tokyo Metropolitan Institute of Gerontology Index of Competence (TMIG-IC) and hand-grip strength. Scores of the K-PASE had a low significant correlation with TMIG-IC (r=.246, p<.001), and hand-grip strength (r=.251, p<.001). The mean score of physical activity of Korean elderly assessed by the K-PASE was 96.5. Conclusion: We conclude that the K-PASE is a reliable and valid instrument to assess physical activity for Korean elderly.