• 제목/요약/키워드: change of variables

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A Strategy of modeling for fermentation process by using genetic-fuzzy system

  • 나정걸;이태화;장용근;정봉현
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2000년도 춘계학술발표대회
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    • pp.177-180
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    • 2000
  • An algorithm for modeling of yeast fermentation process using genetic-fuzzy algorithm is presented in this work. The algorithm involves developing the fuzzy modeling of the process and model update capability against the system change. The membership functions of state variables and specific rates and the decision table were generated using genetic algorithm. This algorithm could replace the complex mathematical model to simple fuzzy model and cope with the change of process characteristics well.

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20대 남성에서 최대운동이 뇌로가는 혈관인 총경동맥 혈류 속도에 미치는 영향 (Maximum exercise in 20 men Common carotid artery blood flow velocity impact)

  • 김지원
    • 한국방사선학회논문지
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    • 제3권4호
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    • pp.5-12
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    • 2009
  • 총경동맥은 심장으로부터 혈액을 직접 대뇌로 전달하는 동맥 혈류 순환이 중요하며, 특히 동맥 혈관내의 혈액의 흐름을 방해하는 여러 변인들이 있다. 그 변인 중에서도 평균혈류속도, 맥박지수, 및 혈류 저항 변인 등이 있는데, 이중 맥박지수나 혈류저항지수는 최대 수축기와 이완기시 혈류속도와 관련이 되어있기 때문에 혈압과도 중요한 변인들이 된다, 이와 같은 뇌혈류 속도 변인들의 변화에 대해서 관찰하는 데는 비침습적인 초음파를 이용한 도플러 뇌혈류 측정법을 이용한다. 최대운동은 20대 남성에서 뇌로가는 혈류인 총경동맥의 혈류속도를 증가 시킬 수 있는 것으로 나타났다.

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중년여성의 운동행위 변화단계, 운동 자기효능감, 우울 및 스트레스에 관한 연구 (A Study on the Stage of Change in Exercise Behaviors, Exercise Self Efficacy, Depression and Stress in Middle Aged Women)

  • 이윤미;박형숙
    • 여성건강간호학회지
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    • 제10권3호
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    • pp.218-225
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    • 2004
  • Purpose: The study was performed to identify exercise self-efficacy, depression, and stress by the stage of change in exercise behavior in middle aged women. Method: The subjects consisted of 317 women residing in B city by convenience sampling. The collected data was analyzed by the SPSS/WIN program. Result: The subjects were distributed in each stage of exercise behavior change: There were 53 subjects in the pre-contemplation stage, 86 subjects in the contemplation stage, 88 subjects in the preparation stage, 51 subjects in the action stage and 39 subjects in the maintenance stage. Analysis of variance showed that exercise self-efficacy (F=39.9, p<.001), depression (F=5.58, p<.001), and stress (F=6.33, p<.001) were significantly associated with the stages of exercise behavior change. There was a significant negative correlation between the stage of change and depression, and the stage of change and stress, but a significant positive correlation between the stage of change and self- efficacy, depression and stress. Conclusion: This study identified that exercise self-efficacy, depression and stress were significant variables to explain a possible relationship with exercise stages of middle aged women. This study provides new information to influence the development of better health promotion and exercise intervention for middle aged women in the community.

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수준에서의 변화에 적응하는 구조모형 (An Adaptive Structural Model When There is a Major Level Change)

  • 전덕빈
    • 한국경영과학회지
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    • 제12권1호
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    • pp.19-26
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    • 1987
  • In analyzing time series, estimating the level or the current mean of the process plays an important role in understanding its structure and in being able to make forecasts. The studies the class of time series models where the level of the process is assumed to follow a random walk and the deviation from the level follow an ARMA process. The estimation and forecasting problem in a Bayesian framework and uses the Kalman filter to obtain forecasts based on estimates of level. In the analysis of time series, we usually make the assumption that the time series is generated by one model. However, in many situations the time series undergoes a structural change at one point in time. For example there may be a change in the distribution of random variables or in parameter values. Another example occurs when the level of the process changes abruptly at one period. In order to study such problems, the assumption that level follows a random walk process is relaxed to include a major level change at a particular point in time. The major level change is detected by examining the likelihood raio under a null hypothesis of no change and an alternative hypothesis of a major level change. The author proposes a method for estimation the size of the level change by adding one state variable to the state space model of the original Kalman filter. Detailed theoretical and numerical results are obtained for th first order autoregressive process wirth level changes.

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중년 흡연남성의 금연 변화단계에 따른 의사결정 균형에 대한 연구 (Decisional balance corresponding to the Stage of Change of Smoking Cessation in Middle Aged Men)

  • 장성옥;박창승;민인선
    • 기본간호학회지
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    • 제7권2호
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    • pp.164-176
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    • 2000
  • Purpose : This study was done to identify the factors of decisional balance for smoking cessation among middle aged men in Korea. This was composed of a set of variables at the level of decision making when middle aged men decide to stop smoking. It was used to classify and identify the characteristics of the stages of change for smoking cessation to which the middle aged men belong, and was used to identify the variables of decisional balance which influenced the stages of change for smoking cessation in middle aged men. Methods : A convenience sample of 169 men who had smoked and were smoking, were between age 30 and 60 and lived in Seoul(mean age=44), were selected from the community. The data was collected from December 10, 1999 to February 28, 2000. The research instrument was the Decisional Balance Measure for Smoking Cessation (Velicer et al., 1985). and Stage of Change Measure(DiClemente et al., 1991). The data were analyzed using the SAS Program. Results : 1. According to stage of change measure, the 169 subjects were distributed in each stage of change for smoking cessation: in the pre-contemplation stage 63 subjects(32.7%), contemplation stage 60 subjects (35.5%), preparation stage 17 subjects(10.1%), and maintenance stage 29 subjects(17.2%). 2. Factor analysis identified 4 factors of decisional balance as appropriate factors for smoking cessation of middle aged men. There were named by the researchers; 1)'Perceived Burden to Self', 2)'Perceived Benefit to Others' 3)'Perceived Approval to Others', and 4)'Perceived Disapproval to Self'. 3. Analysis of variance showed that the three components, 1)'Perceived Burden to Self(F=8.50, P=.0001)', 2)'Perceived Benefit to Others(F=3.19, P=.025)' and 3)'Perceived DisApproval to Self(F=2.87, P=.038)were significantly associated with stage of change. 4. Through discriminant analysis, it was found that 'Perceived Burden to self' was the most influential variable in discriminating the four stages of change(pre-contemplation, contemplation, preparation, and maintenance). Conclusion : The results are consistent with the application of the Transtheoretical model, which has been used to understand how people change health behavior. Even though this study is a cross-sectional, not a longitudinal study, the findings of this study give useful information for smoking cessation intervention for the middle aged men.

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정비사업추진단계별 입지변수들의 영향력 변화에 관한 연구 (A Study on Influential Change of Locational Variables According to the Process of Residential Improvement Projects)

  • 임재문;오세경;권태정
    • 대한토목학회논문집
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    • 제33권5호
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    • pp.2135-2146
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    • 2013
  • 대부분의 주거정비사업관련 연구를 보면 사업추진에 미치는 영향변수를 규명하기 위하여 추진시점을 정하고 있으나 서로 다르게 정하고 있으며, 또한 이에 따른 변수값의 변화정도를 제시하지 않고 있으므로 본 연구에서는 추진시점의 차이가 사업입지변수에 어떤 영향을 보여주는가를 규명하기 위하여 서로 다른 추진시점을 정하고 해당 변수값의 변화정도를 관찰하였다. 사업의 추진단계는 구역지정, 추진위승인, 조합설립인가, 사업시행인가 등 4개의 단계로 구분하고 판별분석, 상관분석 등의 분석도구를 이용하여 그 차이를 규명하였다. 분석결과 재개발사업의 경우 사업시행인가단계를 제외한 3개의 추진단계는 동질의 집단으로 해석할 수 있었으나 사업시행인가단계는 타 단계와 서로 다른 경향을 보여주고 있어 동질집단으로 해석할 수 없었다. 반면, 재건축사업의 경우 4개 집단 모두 같은 경향을 보여주고 있어 동질집단으로 해석되나 구역지정단계의 판별분석결과값은 유의성이 낮게 나타나는 단점을 갖고 있다. 따라서 주거정비사업의 사업추진정도를 파악하는데 필요한 사업추진단계의 차이는 대부분 유사한 결과값으로 관찰되었으므로 사업추진단계에서 서로 다른 단계를 기준으로 분석하여도 같은 결과 값을 보여줄 것으로 사료된다.

비즈니스 시뮬레이션으로 살펴본 스마트워크의 확산 기간과 생산성 연구 (The Diffusion Period and Productivity of Smartwork by Business Simulation)

  • 정병호
    • 디지털산업정보학회논문지
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    • 제17권1호
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    • pp.57-73
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    • 2021
  • The purpose of this study is to analyze the diffusion period and productivity of smartwork in an organization. Firms are increasingly interested in smartwork for non contact work and working from home because of the corona 19. The smartwork is a new technology that changes face-to-face work in an organization. It helps the work of individuals and organizations regardless of time and place. The theoretical background describes the complexity, system thinking, diffusion theory, smart work, organizational resistance, and productivity. This study analyzes the diffusion period and productivity of smart work through business simulation techniques. A simulation study progresses four stages. There are problem definition, hypothesis establishment and causal loop diagram, model construction and verification, and policy evaluation. The simulation models contain an individual's resistance variables organizational investment and leadership variables related to the operation of smartwork. The organizational investment variables include organizational culture, legal system, implement systems and technology investment. The individual resistance variables include cognitive, attitude, structure and technological resistance. The leadership includes leadership interest variables and performance linkage variables. The simulation executed the changes of a people number adopting smart work and the organizational productivity monthly. As a result of the simulation, many organization members have accepted the smart work innovation after 20 months. The organizational productivity through smart work showed very high value after 16 months. In scenario analysis, the individuals' awareness and attitude resistance showed very important variables to productivity and a personal change of smart work adoption. Meanwhile, The organizational investment showed that the high driving-force increased not productivity and the low driving-force showed decreased low productivity. Also, leadership variables showed a powerful driver for changing smart work productivity. The implication of the study has suggested extending complexity, diffusion theory and organization resistance theory based on simulation methods.

추력을 최대화하기 위한 횡자속 선형전동기의 최적설계 (Optimum Design of Transverse Flux Linear Motor for Maximizing Thrust Force)

  • 홍도관;우병철;강도현;장정환;김종무;박건우
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.1159-1161
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    • 2005
  • This study uses a design of experiments to explain correlations between the objective function and design variables. Analysis of means, analysis of variance and table of orthogonal array were carried out. The change of shape design variable for TFLM based on the table of orthogonal array is made. Therefore this study carried to decide design variables for maximizing thrust force of TFLM. we showed improved design variables.

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노인의 실버산업 이용실태에 관한 연구 - 여가서비스를 중심으로 (The study on the realities of silver industry - focusing on the consumption of leisure services)

  • 문숙재;곽민진
    • 가족자원경영과 정책
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    • 제6권2호
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    • pp.97-117
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    • 2002
  • This study aimed at identifying and analyzing consumption of leisure services in silver industry and factors that had effects on them. This focused on the consumption of leisure services and its influence on the variables related to change of elderly's attitude, because socio-economic environment structure is improved and average life span is prolonged. The main findings of the research were as follows: 1. Totally, the percentage of leisure services consumption not so high and kinds of leisure were not various. Also, the reason why they use leisure was just for self-development and their indifference to leisure made them not to use services. 2. There were significant differences in individual characteristics and family-environmental conditions relating the consumption of leisure services in the silver industry. 3. Among variables which influence on the consumption of leisure of the elderly, job was the most significant factors. Also average monthly income, the changable inclination in food, clothing and shelter, social support of the family, status of residing, status of health and source of income were influential variables.

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영화공급사슬 내 성과정보와 입소문 효과의 동적상호작용에 대한 연구 (Dynamic Interaction of Performance Information and Word-of-Mouth in Film Industry)

  • 이원희
    • 경영과학
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    • 제32권2호
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    • pp.125-143
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    • 2015
  • When studying the film industry, researchers have seldom addressed the dynamic interaction between marketing information and word of mouth in the motion picture industry mainly because of the limitation of traditional research methodologies. This study explores integration and competition among important variables influencing on audience's choice on movie selection, particularly by using a new method of agent-based modeling including competitive environment. Decision process of moviegoer composed of transition probability based on multinomial logit model, considering marketing and box-office information, critique, and word of mouth from other moviegoers. After validating the fitness of market share among released movies, this study conducted a set of simulation experiments considering several variables such as market size, change of weight between variables, and movie performance under competition. Propositions are derived from the simulation results is also suggested for future research.