• 한국가스학회지
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• 제27권2호
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• pp.57-64
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• 2023

가스계량기의 검침방식이 발전하면서 원격검침이 가능한 스마트 가스 계량기(누출점검용 계량기 및 다기능 안전 계량기)가 사용되고 있다. 이러한 계량기는 부가기능으로 수집하는 유량 및 압력 데이터를 활용하여 누출 판단을 하는 기능이 있다. 유량 데이터를 이용한 누출판단 기능은 실제 현장에서 유효한 사례가 있지만 압력 데이터 기반 누출 판단 기준은 누출로 인한 압력 값 변화뿐만 아니라 여러 요인(정압기 압력 크기, 인접 계량기 연계, 인접 주택 사용량, 계량기 위치 등)으로 압력 크기 변화(레벨)가 있는 문제점이 있다. 본 논문에서는 스마트 가스계량기에서 수집되는 압력데이터를 활용하여 누출여부를 판단 할 수 있는 기법으로 압력 데이터 전처리 방법과 누출 여부 관련 압력 값 범위 기준, 누출판단 기법 및 적용 사례 검증을 통해 개발하였다.

• 대한산업공학회지
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• 제14권1호
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• pp.57-71
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• 1988

Checklist method is rapid and comprehensive to evaluate in practice. Check items are commonly rated by subjective utility function; i.e., evaluator's significant judgment. Since human judgment includes fuzziness (vagueness) inherently in spite of its significance, fuzzy set theory is useful in this case. The paper illustrates a evaluation method using fuzzy checklist where check items are rated as fuzzy numbers. Pairwise comparison data is used to determine the weights of check items, since it has comparative advantage for human's fuzzy judgment. Sample of BASIC program is provided for microcomputer. When uncertainty is due to subjectivity or imprecision of data, this method can be applied to practical problems widely.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.158.6-158
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• 2001

A band function model paired comparison(BMPC) method is a kind of paired comparison methods. Considering that human has ambiguity, the BMPC method uses a monotonous increase function with the width as the human judgment characteristic. Since panel´s judgments do not always have enough response, it is very important to examine inspection abilities of each panel. In this study. We focus on the difference of band functions in each panel, which is the characteristic function of judgment in the BMPC method, and examine the method of obtaining panels inspection abilities. Three kinds of evaluation functions, "the dispersion of judgments", "the resolution", and "the difference of the judgments" are defined from Panel´s characteristic function of ...

• 한국정밀공학회지
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• 제16권3호통권96호
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• pp.215-221
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• 1999

The object of the thermal error compensation system in machine tools is improving the accuracy of a machine tool through real time error compensation. The accuracy of the machine tool totally depends on the accuracy of thermal error model. A thermal error model can be obtained by appropriate combination of temperature variables. The proposed method for optimal variable selection in the thermal error model is based on correlation grouping and successive regression analysis. Collinearity matter is improved with the correlation grouping and the judgment function which minimizes residual mean square is used. The linear model is more robust against measurement noises than an engineering judgement model that includes the higher order terms of variables. The proposed method is more effective for the applications in real time error compensation because of the reduction in computational time, sufficient model accuracy, and the robustness.

• 한국음향학회지
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• 제7권4호
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• pp.5-12
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• 1988

일차 반사음의 최적지연시간과 음장의 Preference 판단에 있어서 다른 민족간의 피험자 사이에 차이가 있는지를 알기 위해, 무향실에서 일차 측방반사음을 시뮬레이션하여 지연시간을 가변하면서 주관 Preference 실험을 하였다. 그 결과 일차 반사음의 최적지연시간은 반사음의 레벨이 직접음의 레벨과 같을때 음원의 자기상관함수(ACF) 의 유효지속시간과 일치하며, 음악 모티브가 다르고, 판단 시리즈가 달라도 음장에 대한 Preference판단에 기본적인 차이가 없는 것을 알았다. 또 하나의 음악 모티프에서 다른 2개의 패세지를 사용하여 Preference실험한 결과, 음악 전체에 대한 ACF의 유효지속시간의 변동이 적음을 알았다. 따라서 일차반사음의 최적지연시간은 음원의 ACF와 반사음의 진폭으로부터 예측할 수 있다.

• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.108-115
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• 2020

Blended learning is a teaching method utilizing all the advantages in 'on and off-line' learning circumstances in order to enhance the learning effect and efficiency, more than the simple use of online factors in the classroom education. In this paper, we present the realization and simulation of algorithm for the realtime evaluation of low-grade and high-grade subjects in order to implement smart e-learning system, considering a lecture intelligibility. In order to grasp the levels of student's intelligibility, we simulated a function that automatically summarizes the study contents of class given by a lecturer. Especially, in administrator mode of smart e-learning system, we suggested and simulated a system in order to help the lecturer to easily manage the student's grades, and we have provided software to tell the student's intelligibility of lecture, analyzed the rate of incorrect answers, automatic judgment of lecture intelligibility and judge the weakest subject.

• 감성과학
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• 제16권1호
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• pp.95-106
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• 2013

본 연구에서는 자발적인 웃음과 인위적인 웃음을 변별하는 데 있어서 일반 사람들의 정확도와 컴퓨터를 이용한 분류 알고리즘의 정확도를 비교하였다. 실험참가자들은 단일 영상 판단 과제와 쌍비교 판단과제를 수행하였다. 단일 영상판단 과제는 웃음 영상을 한 장씩 제시하면서 이 영상의 웃음이 자발적인 것인지 인위적인 것인지를 판단하는 것이었으며, 쌍비교 판단과제는 동일한 사람에게서 얻은 두 종류의 웃음 영상을 동시에 제시하면서 자발적인 웃음 영상이 어떤 것인지 판단하는 것이었다. 분류 알고리즘의 정확도를 산출하기 위하여 웃음 영상 각각에서 8 종류의 얼굴 특성치들을 추출하였다. 약 50%의 영상을 사용하여 단계적 선형판별분석을 수행하였으며, 여기서 산출된 판별함수를 이용하여 나머지 영상을 분류하였다. 단일 영상에 대한 판단결과, 단계적 선형판별분석의 정확도가 사람들의 정확도보다 높았다. 쌍비교에 대한 판단결과도 단계적 선형판별분석의 정확도가 사람들의 정확도보다 높았다. 20명의 실험참가자 중 선형판별분석의 정확도를 넘어서는 사람은 없었다. 판별분석에 중요하게 사용된 얼굴 특성치는 눈머리의 각도로, 눈을 가늘게 뜬 정도를 나타낸다. Ekman의 FACS에 따르면, 이 특성치는 AU 6에 해당한다. 사람들의 정확도가 낮은 이유는 두 종류의 웃음을 구별할 때, 눈에 관한 정보를 충분히 사용하지 않았기 때문으로 추론되었다.

• Computers and Concrete
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• 제13권5호
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• pp.659-677
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• 2014

A Bayesian response surface updating procedure is applied in order to update the parameters of the covariance function of a random field for concrete properties based on a limited number of available measurements. Formulas as well as a numerical algorithm are presented in order to update the parameters of response surfaces using Markov Chain Monte Carlo simulations. The parameters of the covariance function are often based on some kind of expert judgment due the lack of sufficient measurement data. However, a Bayesian updating technique enables to estimate the parameters of the covariance function more rigorously and with less ambiguity. Prior information can be incorporated in the form of vague or informative priors. The proposed estimation procedure is evaluated through numerical simulations and compared to the commonly used least square method.

• Osong Public Health and Research Perspectives
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• 제9권6호
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• pp.354-361
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• 2018

Objectives: The purpose of this study was to explore the effects of injection laryngoplasty (IL) with hyaluronic acid in patients with vocal fold paralysis (VFP). Methods: A total of 50 patients with VFP participated in this study. Pre- and post-IL assessments were performed, which included analyzing the sustained vowel /a/ phonation, and the patient reading 1 Korean sentence from the "Walk" passage that comprised 25 syllables in 10 words. To investigate the effect of IL on vocal fold function, acoustic analysis (acoustic voice quality index, cepstral peak prominence, maximum phonation time, speaking fundamental frequency) was conducted and auditory-perceptual (grade and overall severity), visual judgment (gap), and self-questionnaire (voice handicap index-10) assessments were performed. Results: The patients with VFP showed statistically significant differences between pre-and post-IL assessments for acoustic and auditory-perception, visual judgment, and self-questionnaire assessments. Conclusion: The patients with VFP showed positive change in vocal fold function between pre- and post-IL measurements. The findings showed that IL with hyaluronic acid is an effective method to improve vocal fold function in patients with VFP.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.90-93
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• 2003

The function, which represents the closed curve, is found from the sampling data by S-System in this study. Two methods are proposed. One is the extension of S-System. The data x and y are regarded as input data, and the data z=0 as output data. To avoid the trap into the invalid function, the judgment points (x$\_$j/, y/sug j/) are introduced. They are arranged in the inside and the outside of the closed curve. By introducing this concept, the functions representing closed curve are found by S-System. This method is simple because of a little extension of S-System. It is, however, difficult for the method to find the complex function like a hand-written curve. Then another method is also proposed. It uses the system incorporating the argument function. The closed curve can be expressed by the argument function. The relatively complex function, which represents the closed curve like a hand-written curve, is found by utilizing argument function.