• Title/Summary/Keyword: Change of behavior

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Analysis of the Impinging Spray Behavior Accompanying with Change of Phase (상변화를 동반한 충돌분무의 거동해석)

  • Song, Hong-Jong;Cha, Keun-Jong;Kim, Duck-Jool
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.6
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    • pp.852-859
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    • 2000
  • The emission in the exhaust gas from diesel engine is effected by the fuel spray characteristics. The spray of D.I. diesel engine impinges on a piston cavity and a cylinder wall. It is very important to know exactly the distribution and behavior of the spray inside cylinder. The objective of this study is to develop more accurate evaporation model. The EPISO code was used to analyze the flow characteristics in the engine. The Wakil model and the Faeth model are applied to the EPISO code to analyze the behavior of impinging spray. And also experimental and numerical analysis were carried out. The spray behavior characteristics were investigated by changing injection pressure, ambient pressure and temperature. The behavior of impinging spray was strongly effected by the change of ambient pressure and temperature. The effects of evaporation and rebounding droplet should be considered.

대학 졸업예정자들의 직업탐색활동의 변화와 개인적 특성의 영향에 관한 연구

  • An, Gwan-Yeong
    • 한국산학경영학회:학술대회논문집
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    • 2005.11a
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    • pp.1-9
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    • 2005
  • Job search research has been criticized for failing to study the dynamics and change of the job search process. A lot of previous researches have used cross-sectional designs and treated job search as a static process. As a result, job search research has failed to examine how job seekers' behaviors change during the course of their search. This paper examined changes In job search behaviors(preparatory and active job search behavior, and job search intensity) and the effects of individual difference variables(self-esteem, self-efficacy, extroversion, agreeableness, conscientiousness, openness) on job search behaviors. Data were gathered from 404 university students who had not found employment at the time of beginning of second semester The results of t-test pairs indicated that job seeking students increased their preparatory job search behavior and active job search behavior, but didn't job search intensity. The results of multiple regression showed that self-efficacy had strong relationship with preparatory and active job search behavior, and job search intensity, but self-esteem had not any relationship with them. Among big-5 personality, extroversion had relationship with active job search behavior and job search intensity, and agreeableness only with job search intensity.

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A Comparison of Food and Nutrient Intake Status of Aged Females in A Rural Long Life Community by the Stage Model of Dietary Behavior Change (농촌 장수마을 여자 노인의 식행동 변화단계 모형에 따른 식품 및 영양소 섭취상태 비교)

  • Park, Mi-Yeon;Chun, Byung-Yeol;Jo, Soon-Jae;Jeong, Gu-Beom;Huh, Chul-Hyoi;Kim, Geum-Ran;Park, Phil-Sook
    • Korean Journal of Community Nutrition
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    • v.13 no.1
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    • pp.34-45
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    • 2008
  • For the correct dietary habit and balanced dietary intake of aged people, the nutrition management that fits to the dietary behavior change stage has to be accomplished. In order to do so, in this paper, we chose 175 women that are aged more than 65 years old who are rural long life community residents and surveyed the dietary intake for 2 days including a twice depth interview and the 24 hour recall method. Also, for the sake of our aim, using the transtheoretical model, the dietary behavior change stage group was divided into the contemplation stage group, the preparation stage group, the action stage group and the maintenance stage group. The results are as follows: In the intake amount of protein (p < 0.01), vitamin $B_1$ (p < 0.05) and vitamin $B_6$ (p < 0.05), the intake amount of these nutrients in the action stage group and the maintenance stage group were significantly larger than the intake amount in the contemplation stage group and the preparation stage group. The nutrition evaluation according to the dietary behavior change stage, the ratio of subjects who took insufficient amount of energy, protein, vitamin A, and vitamin C were low as the dietary behavior change stage was upgraded. The subjects of maintenance stage group were most likely to consume vegetables more than once a day, and consume fruits and milk and milk products more than 5 times/week. MAR [13], MAR [10] and MAR [4] of subjects in the action stage group and the maintenance stage group were significantly higher than MAR [13], MAR [10] and MAR [4] of subjects in the contemplation stage group and the preparation stage group (p < 0.001). From the above results, there were differences of nutrient intakes according to the dietary behavior change stage. Therefore, it is considered that the intervention for the dietary behavior motivation induction has to be advanced before accomplishing the individually fitting intervention at the time of nutrient management intervention.

Lane Change Behavior of Manual Vehicles in Automated Vehicle Platooning Environments (군집주행 환경에서 비자율차의 차로변경행태 분석)

  • LEE, Seol Young;OH, Cheol
    • Journal of Korean Society of Transportation
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    • v.35 no.4
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    • pp.332-347
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    • 2017
  • Analysis of the interaction between the automated vehicles and manual vehicles is very important in analyzing the performance of automated cooperative driving environments. In particular, the automated vehicle platooning can affect the driving behavior of adjacent manual vehicles. The purpose of this study is to analyze the lane change behavior of the manual vehicles in automated vehicle platonning environment and to conduct the experiment and questionnaire surveys in three stages. In the first stage, a video questionnaire survey was conducted, and responsive behaviors of manual vehicles were investigated. In second stage, the driving simulator experiments were conducted to investigate the lane change behaviors of in automated vehicle platonning environments. To analyze the lane change behavior of the manual vehicles, lane change durations and acceleration noise, which are indicators of traffic flow stability, were used. The driving behavior of manual vehicles were compared across different market penetration rates (MPR) of automated vehicles and human factors. Lastly, NASA-TLX (NASA Task Load Index) was used to evaluate the workload of the manual vehicle drivers. As a result of the analysis, it was identified that manual vehicle drivers had psychological burdens while driving in automated vehicle platonning environments. Lane change durations were longer when the MPR of the automated vehicles increased, and acceleration noise were increased in the case of 30-40 years old or female drivers. The results from this study can be used as a fundamental for more realistic traffic simulations reflecting the interaction between the automated vehicles and manual vehicles. It is also expected to effectively support the establishment of valuable transportation management strategy in automated vehicle environments.

An Experimental Study on Shear Strength of Girder Ledge of Precast Girder-Beam Connection (프리캐스트 Girder-Beam 접합부에서 Girder Ledge의 전단내력에 관한 실험적 연구)

  • 배준우;박성무
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.408-415
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    • 1996
  • This study is aimed to define the behavior of the girder ledge of precast girder-beam joint in rame type precast concrete construction method. The variable of this study is followed : 1) The change of the maximum shear strength depended on the transformation of concrete compressive strength 2) The change of the behavior of ledge depended on the transformation of shear-span ratio 3) The change of maximum shear strength and ductility by the type of reinforcement. The results of this study show the behavior of ledge is affected by shear-span ratio and the maximum shear strength is depended on the concrete compressive strength, reinforcement ratio and effective section area. In addition, through the investigation of the established study, the results of this study suggest the shear friction formula of Raths.

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An Analysis about the Moving Behavior of Students by Simulation on Variation Type in Middle School (시뮬레이션을 활용한 교과교실형 운영 중학교 학생 이동행태 분석)

  • Jeong, Joo-Seong
    • Journal of the Korean Institute of Educational Facilities
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    • v.21 no.3
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    • pp.11-18
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    • 2014
  • This study was carried out to observe movement behavior of students about a change of physical condition in moving space of variation type using simulation technique. The moving pattern of students was checked by SIMULEX program. The width of corridor was adjusted to 2.4m, 3.0m and 3.9m and a flow coefficient of simulation was estimated with the change of width. The wider the width of corridor was, the lower a flow coefficient was, and the difference was large when the width of corridor was narrow. It was also observed that the flow coefficient was relatively high in all types of corridor setup individual locker. Unit occupation area with the change of width was additionally measured, as shown in the results, the occupation density was low when the width of corridor was wide and a stationary time was short.

Roles of Threat and Coping Appraisal in Adoption of Green Information Technology: Ordered Protection Motivation Theory Perspective

  • Lee, Namyeon;Jin, Yanshou;Kwon, Ohbyung
    • Asia pacific journal of information systems
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    • v.23 no.2
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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.

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Provider's Behavior Change after the Public Release of the Information on the Cesarean Section Rate (제왕절개 분만율 공표 후 요양기관의 분만행태 변화)

  • 고수경;신순애;김기영;김창엽
    • Health Policy and Management
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    • v.11 no.3
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    • pp.121-150
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    • 2001
  • This study was conducted to investigate provider's behavior change after releasing the information on the Cesarean section rate. Claims data filed at the National Health Insurance Corporation was used for this analysis and the focus of this study was the change of cesarean rate after the public disclosure of information. Average rates of the year 1999 and 2000 were compared, on the institutional basis, and range and coefficient of variation were estimated. For the last decade, Cesarean section rate has been increased dramatically. Clinical or demographic factors could not adequately explain the increase. Instead, nonclinical factors, such as financial incentive, physician's convenience, practice characteristics, etc., were more significant in explaining the increasing rate. Providers' behavior was significantly affected by the public release of information: after the release, average rate was decreased by 10.2%, and variations were also decreased. In particular, the extent of decrease was explained mainly by nonclinical factor rather than clinical ones. The results suggest that disseminating practice information to providers and consumers could contribute to reducing unnecessary medical service.

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Factors Associated with the Preparation Stage to Quit Smoking among College Smokers (대학생 흡연자의 금연 준비단계 관련 요인)

  • Paek, Kyung-Shin;Kwon, Young-Sook
    • Research in Community and Public Health Nursing
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    • v.22 no.2
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    • pp.173-183
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    • 2011
  • Purpose: This study was to compare the Transtheoretical Model components according to the stage of change in smoking cessation behavior and identify factors associated with preparation to quit smoking among college smokers. Methods: Data were collected from 224 undergraduate students using the self-report questionnaire. The survey variables comprised the stage of change in smoking cessation, self-efficacy, and decisional balance and process of change in smoking cessation. Results: There were significant differences in self-efficacy, cons of smoking, and the process of change according to the stage of change in smoking cessation behavior. Cons of smoking and self liberation were significant factors related to the preparation stage of smoking cessation. Conclusion: Strategies to enhance cons of smoking and self liberation in college smokers will be an important intervention component to prepare and plan smoking cessation in future studies.

A Post-analysis of the Association Rule Mining Applied to Internee Shopping Mall

  • Kim, Jae-Kyeong;Song, Hee-Seok
    • Proceedings of the Korea Inteligent Information System Society Conference
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    • 2001.06a
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    • pp.253-260
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    • 2001
  • Understanding and adapting to changes of customer behavior is an important aspect for a company to survive in continuously changing environment. The aim of this paper is to develop a methodology which detects changes of customer behavior automatically from customer profiles and sales data at different time snapshots. For this purpose, we first define three types of changes as emerging pattern, unexpected change and the added / perished rule. Then we develop similarity and difference measures for rule matching to detect all types of change. Finally, the degree of change is evaluated to detect significantly changed rules. Our proposed methodology can evaluate degree of changes as well as detect all kinds of change automatically from different time snapshot data. A case study for evaluation and practical business implications for this methodology are also provided.

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