• Bulletin of the Korean Chemical Society
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• 제30권9호
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• pp.2001-2006
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• 2009

Temperature dependence of the critical micelle concentration (CMC), $x_{CMC}$, in micellization can be described by ln $x_{CMC}$ = A + BT + C lnT + D/T, which has been derived statistical-mechanically. Here A, B, C, and D are fitting parameters. The equation fits the CMC data better than conventionally used polynomial equations of temperature. Moreover, it yields the unique(exponent) value of 2 when the CMC is expressed in a power-law form. This finding is quite significant, because it may point to the universality of the thermal behavior of CMC. Hence, in this article, the nature of the equation ln $x_{CMC}$ = A + BT + C lnT + D/T is examined from a lattice-theory point of view through the Flory-Huggins model. It is found that a linear behavior of heat capacity change of micellization is responsible for the CMC equation of temperature.

• 보건교육건강증진학회지
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• 제28권3호
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• pp.67-82
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• 2011

Objectives: The purpose of this study was to identify the factors influencing the stages of exercise behavior change after adjusting for related covariates. Methods: Participants included 362 of fourth to sixth graders in 3 elementary schools in a metropolitan city in Korea. The data were collected using structured questionnaire included Korean Stages of Change Scale for Exercise. Results: Logistic regression results showed that the motivational factors associated with transition from precontemplation to contemplation were cognitive process of change, self-reevaluation, conscious raising; regarding that from contemplation to preparation, cons of the decisional balance; regarding those from preparation to action, behavioral process, counter-conditioning, stimulus control, which were very similar to the results of previous researches subjected other age groups. But, there was no motivational factors associated with from action to maintenance, and self-efficacy had no influence on forwarding stages of change. Conclusions: TTM would be applicable to explain the exercise behavior of some children in Korea, which suggested that it be useful in developing the programs to improve physical activities of Korean school children.

• Geomechanics and Engineering
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• 제13권5호
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• pp.743-756
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• 2017

Laboratory investigation reveals that rockfills exhibit significant stress-path-dependent behavior during shearing, therefore realistic prediction of deformation of rockfill structures requires suitable constitutive models to properly reproduce such behavior. This paper evaluates the capability of a strain hardening model proposed by the authors, by comparing simulation results with large-scale triaxial stress-path test results. Despite of its simplicity, the model can simulate essential aspects of the shear behavior of rockfills, including the non-linear stress-strain relationship, the stress-dependence of the stiffness, the non-linear strength behavior, and the shearing contraction and dilatancy. More importantly, the model is shown to predict the markedly different stress-strain and volumetric behavior along various loading paths with fair accuracy. All parameters required for the model can be derived entirely from the results of conventional large triaxial tests with constant confining pressures.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제3권1호
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• pp.47-53
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• 2022

The escape behavior of prey fish to predator attack is directly linked to the survival of the fish. In this study, I explored the escape behavior of Medaka fish to bird attacks. To simulate the attack, I designed a model triangular-shaped bird to slide along a fishing line connected between rods at both ends of the tank. The triangular shape was set to 10×15 (S=1), 15×20 (S=2), and 20×25 cm (S=3) with base×height. The slope (θ) of the fishing line, which determines the attack speed of the model bird, was set to values of 15° (θ=1), 30° (θ=2), and 45° (θ=3). The escape behavior was characterized using five variables: escape speed (ν), escape acceleration (α), responsiveness (γ), branch length similarity entropy (ε), and alignment (ϕ). The experimental results showed when (S, θ)=(fixed, varied), the change in values of the five variables were not significant. Thus, the fish respond more sensitively to S than to θ In contrast, when (S, θ)=(varied, fixed), ν, α, and γ showed increasing trends but ε and ϕ did not change much. This indicates the nature of fish escape behavior irrespective of the threat is inherent in ε and ϕ. I found that fish escape behavior can be divided into two types for the five physical quantities. In particular, the analysis showed that the type was mainly determined by the size of the model bird.

• Asia pacific journal of information systems
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• 제23권2호
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• pp.87-109
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• 2013

While many surveys show very positive attitudes on the part of consumers towards eco-friendly products, the market share actually reflecting green IT purchases remains low in most countries. The motivations behind green IT purchase behavior are still obscure. Several studies have addressed the question of green IT diffusion from economic and normative viewpoints in an attempt to interpret IT adoption behavior. This study comes at the question from a different angle, namely negative frame, examining threat and coping behaviors using the Ordered Protection Motivation (OPM) model and threat appraisal theory. The results show that attitudes toward fairness and positive change, which are precedents of threat appraisal, play an important role in determining threat appraisal. Perceived threats in the green IT arena include habit change and ecological change. Appraisal for coping with these threats directly affects initial adoption behaviors regarding available green IT, and then indirectly encourages the purchase of new green IT products.

• Journal of Multimedia Information System
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• 제6권4호
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• pp.179-184
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• 2019

This paper introduces a study for procedurally generating the behavior of objects in a virtual environment at runtime. This study was initiated to enable the behavioral model of objects in virtual reality applications to evolve in response to user behavior at runtime. Our approach is to describe the behavior of an object as a behavior tree, and to make a node of the behavior tree change to another type if a certain condition is satisfied. We defined four types of node changes: "parameterized", "probabilistic", "alternate", and "variant". We experimented with a virtual environment that includes a variety of simple procedural elements to explore the possibilities of our approach. As a result of the implementation, if an optimization algorithm that can select and apply the optimized procedural elements in response to the user's behavior is complemented, it is confirmed that more intelligent objects and agents can be implemented in virtual reality applications.

• 한국컴퓨터정보학회논문지
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• 제29권4호
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• pp.177-182
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• 2024

소비자의 많은 의사결정은 제품에 대한 감정적 반응에 일어나며, 마케팅에서는 이러한 다듬어지지 않은 반응을 정서(Affect)라고 칭한다. 정서에는 평가(evaluation), 무드(mood), 감정(emotion)과 같은 반응 유형도 있으나, 무의식적인 변화를 의미하는 감성(Sensibility) 또한 이에 포함된다. 선행 연구들에 따르면 기상요소들은 사람들의 이러한 감성에 영향을 미치며, 이는 기상요소들이 소비자들의 의사결정에 영향을 미칠 수 있음을 나타낸다. 본 연구에서는 기상정보와 SNS상의 텍스트마이닝을 통한 위치기반 텍스트 정보를 활용, 기상정보를 통한 감성 예측 모형을 만들어내고, 이러한 감성 모형이 실제 온라인 쇼핑몰 구매자들의 주소 정보와 매칭한 구매자들의 구매 시기 날씨 정보와 결합하여, 기상요소들이 구매자들의 구매 빈도에 미치는 영향을 살펴본다. 본 연구 결과 일 강수량, 합계 일조시간, 평균 지면 온도, 평균 상대습도를 사용한 모형이 온라인 구매 행위 빈도에 유의미한 결과를 나타내었다.

• 지역사회간호학회지
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• 제21권1호
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• pp.63-70
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• 2010

Purpose: This study was to identify the stages of change in smoking cessation behavior and factors associated with the stages of smoking cessation behavior according to the trans-theoretical model. Methods: The subjects were 154 industrial workers working at H Industry in N City, Chonnam Province who were currently smoking and had smoked in the past. Data were analyzed by descriptive statistics, ANOVA, and Duncan's multiple comparison test using SAS Version 10.0. Results: The subjects were distributed among the stages of change in smoking cessation behavior: there were 28 subjects (18.2%) in the precontemplation stage, 71 (46.1%) in the contemplation stage, 21 (13.6%) in the preparation stage, 8 (5.2%) in the action stage, and 26 (16.9%) in the maintenance stage. The amount of smoking per day, self-efficacy, and advantages (pros) of smoking were significantly associated with the stage of change in smoking cessation behavior. Conclusion: This study suggested that the stage of change in smoking cessation behavior of the subject should be identified prior to the application of intervention programs, nursing intervention strategies should be considered to reduce the amount of smoking per day, and the disadvantages of smoking should be perceived.

• 디지털융복합연구
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• 제17권1호
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• pp.457-465
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• 2019

본 연구의 목적은 양육시설 아동을 위한 보편적 긍정적 행동지원 모형을 개발하는 것이다. 이를 위해 55명의 양육시설 종사자 직원을 대상으로 PBS에 관한 요구도를 조사한 결과, 응답자의 76%가 문제행동 예방에 PBS가 필요하며, 인성교육의 대안이라고 응답하였고, 70% 정도가 시설에서 PBS를 운영해 볼 생각이 있다고 응답하였다. 구체적인 모형을 구성해보면, 준비단계에서는 PBS 팀 구성 및 직원교육, 기대행동선정, 현재 행동의 기초선 측정, 보편적 PBS환경을 구축하기를 제안한다. 실행단계에서는 사회적 기술교수, 강화실시하기, 자기행동 목표정하기와 행동점검, 문제행동학생지도, 모니터링 방안을 포함한다. 마지막으로 중재/전-후-유지기 간의 목표행동 변화측정, 사회기술 및 학업성취도 변화, 사회적 타당도 등을 측정하는 효과평가단계를 제안한다. 이 모형을 양육시설 아동들을 대상으로 적용함으로써 문제행동의 감소, 바람직한 행동의 증진과 동시에 아동들을 지도하는 종사자들의 효능감도 향상시킬 수 있을 것으로 기대한다.

• 대한수학회지
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• 제58권3호
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• pp.723-740
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• 2021

Design and maintenance of large span roof structures require an analysis of their static and dynamic behavior depending on the physical parameters defining the structures. Therefore, it is highly desirable to estimate the parameters from observations of the system. In this paper we study the parameter estimation problem for damped shallow arches. We discuss both symmetric and non-symmetric shapes and loads, and provide theoretical and numerical studies of the model behavior. Our study of the behavior of such structures shows that it is greatly affected by the existence of critical parameters. A small change in such parameters causes a significant change in the model behavior. The presence of the critical parameters makes it challenging to obtain good estimation. We overcome this difficulty by presenting the Parameter Estimation Algorithm that identifies the unknown parameters sequentially. It is shown numerically that the algorithm achieves a successful parameter estimation for models defined by arbitrary parameters, including the critical ones.