• Title, Summary, Keyword: linguistic variable

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Fuzzy Rule-Based Method for Air Threat Evaluation (적기의 위협 평가 자동화를 위한 퍼지 규칙 방법론)

  • Choi, Byeong Ju;Kim, Ji Eun;Kim, Jin Soo;Kim, Chang Ouk
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.1
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    • pp.57-65
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    • 2016
  • Threat evaluation is a process to estimate the threat score which enemy aerial threat poses to defended assets. The objective of threat evaluation is concerned with making an engagement priority list for optimal weapon allocation. Traditionally, the threat evaluation of massive air threats has been carried out by air defence experts, but the human decision making is less effective in real aerial attack situations with massive enemy fighters. Therefore, automation to enhance the speed and efficiency of the human operation is required. The automatic threat evaluation by air defense experts who will perform multi-variable judgment needs formal models to accurately quantify their linguistic evaluation of threat level. In this paper we propose a threat evaluation model by using a fuzzy rule-based inference method. Fuzzy inference is an appropriate method for quantifying threat level and integrating various threat attribute information. The performance of the model has been tested with a simulation that reflected real air threat situation and it has been verified that the proposed model was better than two conventional threat evaluation models.

Individual differences in categorical perception: L1 English learners' L2 perception of Korean stops

  • Kong, Eun Jong
    • Phonetics and Speech Sciences
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    • v.11 no.4
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    • pp.63-70
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    • 2019
  • This study investigated individual variability of L2 learners' categorical judgments of L2 stops by exploring English learners' perceptual processing of two acoustic cues (voice onset time [VOT] and f0) and working memory capacity as sources of variation. As prior research has reported that English speakers' greater use of the redundant cue f0 was responsible for gradient processing of native stops, we examined whether the same processing characteristics would be observed in L2 learners' perception of Korean stops (/t/-/th/). 22 English learners of L2 Korean with a range of L2 proficiency participated in a visual analogue scaling task and demonstrated variable manners of judging the L2 Korean stops: Some were more gradient than others in performing the task. Correlation analysis revealed that L2 learners' categorical responses were modestly related to individuals' utilizations of a primary cue for the stop contrast (VOT for L1 English stops and f0 for L2 Korean stops), and were also related to better working memory capacity. Together, the current experimental evidence demonstrates adult L2 learners' top-down processing of stop consonants where linguistic and cognitive resources are devoted to a process of determining abstract phonemic identity.

A Study on the Situational Differences in the Construction and Relationships of Brand Experience Variables (브랜드 체험변수들의 구성 및 영향관계에 있어 상황별 차이에 대한 연구)

  • Kim, Moon-Tae
    • Management & Information Systems Review
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    • v.36 no.3
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    • pp.71-87
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    • 2017
  • This study was conducted to examine differences in the relationship between experiential variables and outcome variables of experiential variables. In this regard, this research tries to construct the items based on past researches and to suggest the problems of the items of past researches. The analysis of various aspects of experiential variables and the validation tests of some models are presented to suggest what the optimal model is and the following suggestions can be made. First, respondents may not feel that the three dimensions of sensation, emotion, and cognition are significantly different. Depending on the respondents, there is a possibility that they may not be able to perceive much of the linguistic difference. The results of this study are summarized as follows. From this point of view, this study suggest that it would be suitable to proceed with the thesis with the experience of simplifying the combination of the five experiences in some combination. Second, there is a correlation between experiential variables, and the effect on outcome variables may vary from one variable to another. And, when there are two outcome variables, assuming a model that affects only the first outcome variable among the experience variables, it is the most suitable model in relation to the performance variable of experience.

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An Adaptive Tutoring System based on Fuzzy sets for Learning by Level (수준별 학습을 위한 퍼지 집합 기반 적응형 교수 시스템)

  • Choi, Sook-Young;So, Ji-Sook;Lee, Sun-Jung
    • The Journal of Korean Association of Computer Education
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    • v.6 no.2
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    • pp.121-135
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    • 2003
  • This paper proposes a web-based adaptive tutoring system based on fuzzy set that provides learning materials and questions dynamically according to students' knowledge state, and gives advices for the learning after an evaluation. For this, we design a courseware knowledge structure systematically and then construct a fuzzy level set on the basis of it considering importance of learning targets, difficulty of learning materials and relation degree between learning targets and learning materials. Using the fuzzy level set, our system offers learning materials and questions to adapt to individual students. Moreover, a result of the test is evaluated with fuzzy linguistic variable. Appling the fuzzy concept to the tutoring system could naturally consider and deal with various and uncertain items of learning environment thus could offer more flexible and effective instruction-learning methods.

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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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Concept analysis of the maternal role (어머니 역할의 개념 분석)

  • Koh, Hyo-Jung
    • 모자간호학회지
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    • v.4 no.1
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    • pp.80-90
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    • 1994
  • Concept analysis is a strategy that examines the attributes or characteristics of a concept. It is a formal linguistic exercise to determine those defining attributes. The basic purpose of concept analysis is to clarify ambiguous concepts in theory, and to propose a precise operational definition which reflects the theoretical base of the concept. The concept of maternal role is too broad and variable in expression, therefore there has been no authentic definition nor standard opinion for this concept. The purpose of this study is to clarify the concept of maternal role which in turn will help in the development of a theory of maternal role attainment. In order to analyze the concept of maternal role, much effort was extended to look up "maternal role" in various dictionaries and literature, but only a few cases were found which listed this terminology. Consultation on the meaning of "mother" and "role" separately was then done and consequently a definition of "maternal role" was obtained through concept analysis of these two words independently, finding their attributes and unifying them. The attributes of the concept of maternal role which was analyzed based on the steps of concept analysis by Walker & Avant (1988) are : 1) Women who have pregnancies 2) Women who have a child 3) Women who rear a child 4) Expected behavior according to social status 5) Learning through social cultures 6) Social interrelationships. The antecedents of the maternal role are : 1) women who are pregnant and deliver a baby, must keep in contact with their child. 2) Circumstances for childrearing must be provided. 3) Formation of self-concept as mother should be developed, cognitive activity, which is necessary for the nurturing activity, financial support and preparation of childrearing should be provided. And the consequences of the maternal role are : 1) Improvement 2) Changeability 3) Ambiguity 4) Stability Through this concept analysis, the concept of the maternal role is defined as "expected behavior by social interrelationships and learned nurturing behavior through social cultures."

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A Study on Focus Position Control of Reflector Using Fuzzy Controller (퍼지제어기를 이용한 반사경의 초점 위치제어에 관한 연구)

  • Jeong, Hoi-Seong;Kim, Jun-Su;Kim, Hye-Ran;Kim, Gwan-Hyung;Lee, Hyung-Ki
    • Journal of Korean Institute of Intelligent Systems
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    • v.21 no.5
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    • pp.645-652
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    • 2011
  • The present study investigated the tracking system of a reflector to trace the movement of sun. The system was designed to minimize the error between the vertical vector of reflector and the position of sun. The proposed system was able to collect the sun lights at a point as a useful source of light energy and transmit the collected light to a remote area through optical fibers. Also the study successfully solved the controller design problem due to the complexity of modeling of the sun tracking system using a fuzzy logic controller which mimics human reasoning.

Stabilization Control of the Nonlinear System using A RVEGA ~. based Optimal Fuzzy Controller (RVEGA 최적 퍼지 제어기를 이용한 비선형 시스템의 안정화 제어에 관한 연구)

  • 이준탁;정동일
    • Journal of the Korean Society of Marine Engineering
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    • v.21 no.4
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    • pp.393-403
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    • 1997
  • In this paper, we proposed an optimal identification method of identifying the membership func¬tions and the fuzzy rules for the stabilization controller of the nonlinear system by RVEGA( Real Variable Elitist Genetic Algo rithm l. Although fuzzy logic controllers have been successfully applied to industrial plants, most of them have been relied heavily on expert's empirical knowl¬edge. So it is very difficult to determine the linguistic state space partitions and parameters of the membership functions and to extract the control rules. Most of conventional approaches have the drastic defects of trapping to a local minima. However, the proposed RVEGA which is similiar to the processes of natural evolution can optimize simulta¬neously the fuzzy rules and the parameters of membership functions. The validity of the RVEGA - based fuzzy controller was proved through applications to the stabi¬lization problems of an inverted pendulum system with highly nonlinear dynamics. The proposed RVEGA - based fuzzy controller has a swing -. up control mode(swing - up controller) and a stabi¬lization one(stabilization controller), moves a pendulum in an initial stable equilibrium point and a cart in an arbitrary position, to an unstable equilibrium point and a center of the rail. The stabi¬lization controller is composed of a hierarchical fuzzy inference structure; that is, the lower level inference for the virtual equilibrium point and the higher level one for position control of the cart according to the firstly inferred virtual equilibrium point. The experimental apparatus was imple¬mented by a DT -- 2801 board with AID, D/A converters and a PC - 586 microprocessor.

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A Study on the Construction of a Real-time Sign-language Communication System between Korean and Japanese Using 3D Model on the Internet (인터넷상에 3차원 모델을 이용한 한-일간 실시간 수화 통신 시스템의 구축을 위한 기초적인 검토)

  • Kim, Sang-Woon;Oh, Ji-Young;Aoki, Yoshinao
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.36S no.7
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    • pp.71-80
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    • 1999
  • Sign-language communication can be a useful way of exchanging message between people who using different languages. In this paper, we report an experimental survey on the construction of a Korean-Japanese sign-language communication system using 3D model. For real-time communication, we introduced an intelligent communication method and built the system as a client-server architecture on the Internet. A character model is stored previously in the clients and a series of animation parameters are sent instead of real image data. The input-sentence is converted into a series of parameters of Korean sign language or Japanese sign language at server. The parameters are transmitted to clients and used for generating the animation. We also employ the emotional expressions, variable frames allocation method, and a cubic spline interpolation for the purpose of enhancing the reality of animation. The proposed system is implemented with Visual $C^{++}$ and Open Inventor library on Windows platform. Experimental results show a possibility that the system could be used as a non-verbal communication means beyond the linguistic barrier.

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The Effect of Robot-Based STEAM Class on the Korean Learning of Multiculturul School Children -Focusing on After School Learning of Elementary School- (로봇 활용 STEAM 수업이 다문화 아동의 한국어 학습에 미치는 영향 -초등학교 방과 후 수업을 중심으로-)

  • Kim, Se-Min;You, Kang-Soo
    • Journal of Digital Convergence
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    • v.13 no.8
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    • pp.1-8
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    • 2015
  • This paper focuses on analyzing Korean language learning effect through the STEAM class using a robot which is targeted on multicultural elementary school students. For the purpose of it, the degree of difficulty and interest of how students feel has been measured. By using the programing tool of Korean language entering base, they learn the programming commands like as variable, data type, branching statement, loop statement, etc in Korean, the effect of Korean learning has been measured. It has been examined two interviews at the beginning and the end of the second semester to measure the effect of Korean language learning. As a result of this research, It can be realized that multicultural children who have similar linguistic characteristics and cultural sphere understood Korean language easily when they take the Korean language class by utilizing a robot, and the class had an effect on the acquisition of Korean language for multicultural children.