• Journal of Information Technology Applications and Management
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• 제12권1호
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• pp.213-229
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• 2005

Cost overrun or schedule delay of the software development project happens frequently despite that software developers continue to make every effort for the effective management of the projects. Previous researches have ascertained that these problems are ascribed to the uncertainty of projects and the improper management of the projects. The purposes of this research are to investigate the impacts of user participation and task interdependence on the performance of the projects and also to find out the appropriate project management method to improve the project performance. Even though the model fitness of the path model is proved to be very high, the verification of the hypotheses showed a variety of results including the four verifications and the one refutation of the hypotheses as well as the suggestion of one alternative hypothesis. The contribution of this research is that the integration model is proposed and verified, comprising the relationship among the user participation, the task interdependence, and the performance of software development projects. A project manager can utilize the implication of this research for an effective management of software development project.

• 아동학회지
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• 제34권3호
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• pp.21-38
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• 2013

The purpose of this study was to examine the path model of mothers' optimism, parenting behaviors and a child's optimism and the effects on their child's subjective well-being. The subjects of this study consisted of 331 pairs of mothers and their children from 5th and 6th elementary school students in Seoul. Data were gathered via four questionnaires on mothers' optimism reported by mothers and their parenting behaviors, child optimism, and child subjective well-being as reported by the children. Data were analysed by Structural Equation Model using AMOS 19.0. The results indicated the following, the hypothesized model yielded an acceptable model fit and most of the hypothesized path coefficients were found to be significant. Specifically, mothers' optimism and parenting behaviors influence their children's subjective well-being indirectly through children's optimism. It is concluded that the more optimistic the mothers, the more likely the children themselves will share that optimism and in turn, they will also have higher levels of subjective well-being.

• 유통과학연구
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• 제20권11호
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• pp.99-108
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• 2022

Purpose: The wide distribution of smartphones has changed life and user behavior. This phenomenon has both advantages and disadvantages for users. As smartphones become a part of our daily lives, smartphone addiction has recently become a social issue in many countries. This study explores factors that affect smartphone addiction and the consequences of addictive behaviors. Research design, data and methodology: Our model hypothesizes that four key factors determine addictive behavior: flow, enjoyment, preference for online social life, and escape reality. Commitment and compulsive use are mediating variables that connect key drivers and addictive results. Based on the SEM (structural equation model) analysis of 497 survey responses, these four driving factors each have a significant effect on the compulsive use of smartphones directly or indirectly; the compulsive use of smartphones directly influences the three results Results: We conducted a reliability and validity analysis, and the results were successful. In the hypothesis test, every path is accepted as expected at the significance level of 0.05. Conclusions: Among the four driving factors, escape reality is the vital factor influencing smartphone addiction and its consequences. And anxiety is the number one consequence influenced by the compulsive use of smartphones.

• 한국심리학회지 : 문화 및 사회문제
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• 제19권1호
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• pp.45-68
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• 2013

본 연구는 자기애와 성폭력의 관계에서 경로모형을 설정하고 검증하고자 하였다. 이를 위해 자기애가 특권 분노에 영향을 미치고 특권 분노가 성적 지배에 영향을 미쳐 성폭력으로 연결되는 경로와, 자기애가 허용적 성태도에 영향을 미치고 허용적 성태도가 성적 대상화에 영향을 미쳐 성폭력으로 연결되는 경로로 구성된 이중 경로모형을 설정하였다. 또한 각 경로의 2차 매개변인인 성적 지배와 성적 대상화가 성폭력에 영향을 미치는 경로에서 알콜사용과 강간통념수용의 조절효과를 검증하고자 하였다. 모형적합성과 조절효과 검증을 위해, 충청지역 4개 대학교에서 수집한 368명의 질문지 자료를 사용하여 구조방정식 모형분석을 하였다. 모형검증 결과, 다양한 대안모형과 적합도 비교에서 1, 2차 매개변인들이 완전 매개하는 연구모형이 가장 적합한 것으로 나타났다. 또한 연구모형의 성적 지배가 성폭력에 영향을 미치는 경로에서, 성적 지배동기가 높으면 알콜사용 수준이 높을 때 또는 강간통념수용 수준이 높을 때 성폭력이 대폭 증가하는 것으로 나타났다. 논의에서는 본 연구 결과의 시사점 및 제언이 기술되었다.

• 인터넷정보학회논문지
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• 제20권3호
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• pp.85-92
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• 2019

In this paper, we extract the quantitative relation data of activities from the workflow event log file recorded in the XES standard format and connect them to rediscover the workflow process model. Extract the workflow process patterns and proportions with the rediscovered model. There are four types of control-flow elements that should be used to extract workflow process patterns and portions with log files: linear (sequential) routing, disjunctive (selective) routing, conjunctive (parallel) routing, and iterative routing patterns. In this paper, we focus on four of the factors, disjunctive routing, and conjunctive path. A framework implemented by the authors' research group extracts and arranges the activity data from the log and converts the iteration of duplicate relationships into a quantitative value. Also, for accurate analysis, a parallel process is recorded in the log file based on execution time, and algorithms for finding and eliminating information distortion are designed and implemented. With these refined data, we rediscover the workflow process model following the relationship between the activities. This series of experiments are conducted using the Large Bank Transaction Process Model provided by 4TU and visualizes the experiment process and results.

• 대한간호학회지
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• 제23권4호
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• pp.678-693
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• 1993

The purposes of this study were to describe the level of vision and hearing impairments, depression and functional capacity, among Korean institutionalized elderly and to examine the relation-ship between sensory impairments, depression, and functional capacity in these people. The final pupose was to test the cognitive function path model using sensory competencies as predictors. A convenience sample of thirty nine male and 90 female subjects with a mean age of 80.5 were the subjects of this study. The subjects were tested for cognitive function, and vision and hearing impairments. Physical function and social function were measured by observation of designated task performance by the subjects. Their level of de-pression was measured using a Geriatric Depression Scale administered through an interview. Individual subjective ratings of hearing and vision were marked by the subjects, on a ladder scale. The results of the study showed that 48.8% of the subjects had a hearing impairment, 63.5% had a vision impairement, and 36.4% had both a vision and hearing impairement. The four sensory groups (no sensory impairement, hearing impairement, vision impairement, hearing and vision impairement) were tested for differences in depression, physical function, social behavior and cognitive function. The only significant difference that was found was in cognitive function, between the no sensory impairement group and the hearing and vision impairement group(F=3.25, P<.05), Subjective ratings of hearing showed a significant correlation with cognitive function(r=.34, p<.001) and with social behavior(r=.31, p<.001). There was no correlation between subjective vision ratings and cognitive function or social behavior. However there was a significant correlation between vision and hearing(r=.49, p<.001). There was also a significant negative correlation between age and vision(r=-.21, p<.01) and between age and hear-ing(r=-.34, p<.001). There was a significant correlation between depression and physical function (r=-.32, p<.001) but there was no correlation between depression and cognitive function or social behavior. Based on the literature review and the result, this study, a path model of sensory competence-> cognitive function- >social behavior was developed and tested : Perceived vision and perceived hearing were the exogenous variahles and cognitive function and social behavior were the endogeneous variables in the model. The path analysis result demonstrated an accept-able fit (GFI=.997, AGFI=.972, X$^2$=.72 (p=.396), RMSR=.019) between the data and the model. There was a significant direct effect($\beta$=.38) of perceived hearing on cognitive function. There was a significant direct effect ($\beta$=.32) of cognitive function on social behavior. The total effect of hearing on social behavior was $\beta$=.32 including the indirect effect ($\beta$=.12) . However perceived vsion had little effect ($\beta$=-.08) on cognitive function. The result of path analysis confirms that hearing levels influence cognitive function, and both hearing and cognitive function levels influence social behavior. However, vision has little effect on cognitive function or on social behavior. For the next study, a combined model of the pre viously developed environment - >depression- > physical and social function model, and the present cognitive function model, should be tested to further refine the functional capacity model. There also a need for longitudinal study of functional capacity and sencory competence in order to better understand how declining sensory competence influences functional capacity and how it effects in-creasing dependency and nursing needs in the elderly.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권3호
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• pp.243-257
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• 2010

Rapid developments in wireless sensor networks have extended many applications, hence, many studies have developed wireless sensor network positioning systems for indoor environments. Among those systems, the Global Position System (GPS) is unsuitable for indoor environments due to Line-Of-Sight (LOS) limitations, while the wireless sensor network is more suitable, given its advantages of low cost, easy installation, and low energy consumption. Due to the complex settings of indoor environments and the high demands for precision, the implementation of an indoor positioning system is difficult to construct. This study adopts a low-cost positioning method that does not require additional hardware, and uses the received signal strength (RSS) values from the receiver node to estimate the distance between the test objects. Since many objects in indoor environments would attenuate the radio signals and cause errors in estimation distances, knowing the path loss exponent (PLE) in an environment is crucial. However, most studies preset a fixed PLE, and then substitute it into a radio propagation loss model to estimate the distance between the test points; such method would lead to serious errors. To address this problem, this study proposes a Path Loss Exponent Estimation Algorithm, which uses only four beacon nodes to construct a radio propagation loss model for an indoor environment, and is able to provide enhanced positioning precision, accurate positioning services, low cost, and high efficiency.

• 경영과학
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• 제26권2호
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• pp.71-89
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• 2009

The purpose of this research is to identify the factors affecting user acceptance of e-learning site. To more precisely explain an individual's behavior of accepting e-learning site, Perceived Interactivity is divided into four components; User Control, Responsiveness, Personalization and Connectedness. This research investigates the causal relationship among four components and basic factors of TAM. This research uses structural equation modeling (SEM) to confirm the validity and analyzes the causal relationship of the suggested model. The results indicates strong support for the validity of proposed model with 54.8% of the variance in behavioral intention to e-learning site. The result finds that all the basic casuality of TAM are significant and most components of Perceived Interactivity are significant. However the path Connectedness to Perceived Ease of Use and User Control to Perceived Playfulness is not significant. Among components of Perceived Interactivity, Personalization is the strongest antecedent of TAM. Perceived Usefulness is the strongest antecedent of behavioral intention of e-learning site.

• 한국자동차공학회논문집
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• 제5권3호
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• pp.209-219
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• 1997

A fuzzy driver model based on a preview-predictor and yaw rate is developed. The model is used to investigate the handling performance of two wheel steering system(2WS) and four wheel steering system(4WS) vehicles. The two degree-of- freedom model which has yaw and lateral motion predicts the path of the vehicles. Based upon the yaw rate and lateral deviations, the fuzzy engine describes the human driver's complicated control behavior which is adjusted for the driving environment. Both typical single lane change maneuver and double lane change maneuver are adopted to demonstrate the feasibility of fuzzy driver model.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.311-320
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• 2018

본 연구는 간호대학생의 전공만족도, 임상수행능력, 진로결정 자기효능감, 진로결정 수준 간의 관계를 확인하고 이들 변수가 진로결정 수준에 영향을 미치는 영향과 경로를 파악하였다. 3개 간호대학 3,4학년 307명을 대상으로 자기기입식설문지를 사용하여 자료수집하였으며, IBM SPSS Amos 21을 이용하여 연구 모형과 변수간의 인과관계를 경로분석하였다. 연구결과 간호대학생의 진로결정 수준은 일반대학생에 비해 높았으며, 학년이 높고, 대인관계가 좋으며, 전공선택 동기가 적성과 취미에 맞을 경우 진로결정 수준이 높았다. 본 연구에서는 진로결정 자기효능감과 진로결정 수준이 전공만족도와 임상수행능력에 영향을 받고 있는 것으로 모형을 구성하였다. 초기모형의 적합도를 향상시키기 위해 모형을 수정하여 설명력을 향상시켰다. 수정모형의 모든 적합도 지수가 수용수준에 미치는 것으로 나타났다($x^2=2412$, GFI=.996, AGFI=.961, RMSEA=.068). 또한 총 5개 중 4개 경로의 계수가 통계적으로 유의미하였다. 진로결정 자기효능감과 진로결정 수준에 영향을 미치는 요인을 확인해 본 결과 전공만족도와 임상수행능력아 진로결정 자기효능감에 직접효과가 있었다. 전공만족도와 진로결정 자기효능감은 진로결정 수준에 직접효과가 있었으며, 임상수행능력은 진로결정 자기효능감을 통하여 진로결정 수준에 영향을 미치는 간접효과가 있는 것으로 나타났다. 진로결정 수준에 영향을 미치는 요인들의 전체효과는 진로결정 자기효능감, 전공만족도, 임상수행능력 순으로 높았다. 이상의 연구결과를 바탕으로 간호대학생의 특성에 맞는 진로지도 프로그램을 개발, 그 효과를 파악하는 연구를 제언한다.