• 한국정보시스템학회지:정보시스템연구
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• 제24권2호
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• pp.1-22
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• 2015

Purpose This study identified the factors influencing on the continuous purchase of social commerce and analyzed the proposed model empirically using structural model. Design/methodology/approach Five independent factors such as economic benefit, social pressure, personal innovativeness, security and reputation and two mediating factors such as value perception and trust were extracted and relationships were explored. This study was carried out through customer survey and statistical analysis on the survey. Findings The result showed that three independent variables such as economic benefit, social pressure and security significantly affected on value perception and trust. Moreover, personal innovativeness and reputation did not have significant influence on customer purchase intention showing different result from the cases of traditional electronic commerce. The results of this study are meaningful in that factors affecting customer purchase intention in social commerce were identified from comprehensive perspective and the importance of customer profit and social influence was verified through empirical study in social commerce.

• 경영과학
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• 제12권1호
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• pp.111-124
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• 1995

With the increasing interest of reducing process variation, statistical process control has served the pivotal tool in most industrial quality programs. In this study, system analyses have been performed associated with a cost incorporated version of a process control, a quadratic loss-based X over bar control chart model. Specifically, two issues, the capital/research investments for improvement of a system and the precision of a parameter estimation, have been addressed and discussed. Through the analysis of experimental results, we show that process variability is seen to be one of the most important sources of loss and quality improvement efforts should be directed to reduce this variability. We further derive the results that, even if the optimal designs may be sensitive, the model appears to be robust with regard to misspecification of parameters. The approach and discussion taken in this study provide a meaningful guide for proper process control. We conclude this study with providing general comments.

• 대한산업공학회지
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• 제25권4호
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• pp.517-526
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• 1999

This paper deals with two economic optimal designs of constant-stress accelerated life test(ALT) where failure distribution follows one of location-scale family, i. e., exponential, Weibull, and lognormal distributions which have been ones of the popular choices of failure distributions. Two optimization criteria to develop ALT plans are the statistical efficiency per unit expected cost which consists of the fixed test cost, cost being proportional to the number of test units, and variable test cost depending on test period and stress level, and the expected loss which combines Taguchi's quadratic loss function and expected test cost. Optimum plan determines the low stress level, test units allocated to each stress, and censoring times at two stress levels under Type I censoring. The proposed ALT plans are illustrated with a numerical example and sensitivity analyses are conducted to study effects of pre-estimates of design parameters.

• 품질경영학회지
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• 제30권4호
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• pp.1-14
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• 2002

Traditional SPC techniques are looking out variation of process by fixed sampling interval and fixed sample size about every hour, the process of in-control or out-of-control couldn't be detected actually when the sample points are plotted near control limits, and it takes no notice of expense concerned with such sample points. In this paper, to overcome that, consider VSI(variable sampling interval) EWMA control charts which VSI method is applied. The VSI control charts use a short sampling internal if previous sample points are plotted near control limits, then the process has high probability of out-of-control. But it uses a long sampling interval if they are plotted near centerline of the control chart, since process has high possibility of in-control. And then a comparison and analysis between FSI(fixed sampling interval) and VSI EWMA in the statistical aspect and economic aspect is studied. Finally, we show that VSI EWMA control chart is more efficient than FSI EWMA control chart in the both aspects.

• 패션비즈니스
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• 제25권6호
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• pp.13-24
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• 2021

In the current economic downturn, it is easy for consumers to be emotional and regret their fashion product purchases. The purpose of this paper was to understand the effect of customer regret on the dissatisfaction and repurchase intention of fashion consumers in China, which is the world's largest fashion trading country. A total of 275 participants were recruited from a Chinese online survey system (www.sojump.com). The SPSS 22.0 statistical package was used for various data analyses. This study conceptualized the positive relationship between customer regret and dissatisfaction and the negative relationship between dissatisfaction and the repurchase intention of fashion goods. The findings indicated that customer regret could be categorized into two distinct types, chosen and forgone regrets. Chosen regret had a greater effect than forgone regret on dissatisfaction. The negative influence of dissatisfaction on repurchase intention was weak in consumers with a high level of regret-solving effort. The results of this study will help fashion businesses retain their customers, thus gaining long-term and repurchase economic value for the fashion industry.

• Communications for Statistical Applications and Methods
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• 제16권6호
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• pp.1031-1036
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• 2009

Under recent dramatic declines in response rates, various procedures have been considered among survey practitioners to reduce nonresponse in order to avoid its potential impairment to the inference. In the random digit dialing telephone surveys, substantial efforts are often required to obtain the initial contact for the screener interview. To reduce a burden with higher data collection costs, refusal conversion can be administered only to a random portion of the sample, reducing nonresponse (bias) with an expense of sample variability increment due to the associated weight adjustment. In this paper, we provide ways to determine the optimal subsampling rate using a linear cost model. Our approach for refusal subsampling is to predetermine a random portion from the full sample and to apply refusal conversion efforts if needed only to the subsample.

• Asian Journal of Business Environment
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• 제13권2호
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• pp.9-20
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• 2023

Purpose: This study aims to map the spatial distribution of poverty using nighttime light satellite images as a proxy indicator of economic activities and infrastructure distribution in D.I Yogyakarta, Indonesia. Research design, data, and methodology: This study uses official poverty statistics (National Socio-economic Survey (SUSENAS) and Poverty Database 2015) to compare satellite imagery's ability to identify poor urban areas in D.I Yogyakarta. National Socioeconomic Survey (SUSENAS), as poverty statistics at the macro level, uses expenditure to determine the poor in a region. Poverty Database 2015 (BDT 2015), as poverty statistics at the micro-level, uses asset ownership to determine the poor population in an area. Pearson correlation is used to identify the correlation among variables and construct a Support Vector Regression (SVR) model to estimate the poverty level at a granular level of 1 km x 1 km. Results: It is found that macro poverty level and moderate annual nighttime light intensity have a Pearson correlation of 74 percent. It is more significant than micro poverty, with the Pearson correlation being 49 percent in 2015. The SVR prediction model can achieve the root mean squared error (RMSE) of up to 8.48 percent on SUSENAS 2020 poverty data.Conclusion: Nighttime light satellite imagery data has potential benefits as alternative data to support regional poverty mapping, especially in urban areas. Using satellite imagery data is better at predicting regional poverty based on expenditure than asset ownership at the micro-level. Light intensity at night can better describe the use of electricity consumption for economic activities at night, which is captured in spending on electricity financing compared to asset ownership.

• 교육녹색환경연구
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• 제7권2호
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• pp.30-46
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• 2008

In this study, were prepared after statistical analysis was conducted of assessment items and marks distribution for the selection of executors of the BTL project. When tests of the degree of dispersion and degree of appropriateness for each assessment item were analyzed, it was found that the degree of dispersion among assessment points has the power of discrimination since it is highly marked in the design field and operation management field. In contrast, 'business management plan' and 'investment composition for economic quality assessment' have a low level of the power of discrimination since points given to them have smaller difference between business projects.

• 품질경영학회지
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• 제36권1호
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• pp.7-19
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• 2008

During the past two decades, a huge amount of research on adaptive control charts has been accomplished. Especially, variable sampling interval (VSI), variable sample size (VSS), and variable sample size and sampling interval (VSSI) charts have been focused by many researchers due to their simplicity and efficiency. On the other hand, the difference among notations, assumptions, methodologies may cause confusions in per forming further studies or practical implementations. This research analyses and compares diverse models so as to provide a unified view on statistical and economical characteristics. As a result, we perform comparative study on economical design models of VSI, VSS, and VSSI charts, respectively, We also present practical guidelines to utilize those adaptive control charts.

• 한국의류학회지
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• 제10권1호
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• pp.19-26
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• 1986

The purpose of this study is to investigate the relationship between clothing behaviors, background and popularity for a group of junior-high school girls in seoul, Korea. background : father's education, type of housing and economic level. popularity : Sociometric test. For statistical analyses of the data from 446 respondents, F-test, t-test, $x^2$-test, M. and S.D. were used. The findings were as follows : 1. (1) Father's education correlated significantly with $\ulcorner$Awareness$\lrcorner$at p<.05, and with $\ulcorner$satisfaction$\lrcorner$ at P<.005. (2) Type of housing correlated significantly with $\ulcorner$conformity$\lrcorner$-at p<.005, and with significantly $\ulcorner$satisfaction$\lrcorner$ at p<.01. (3) Economic level correlated significantly $\ulcorner$conformity$\lrcorner$ at p<.05, and with significantly $\ulcorner$satisfaction$\lrcorner$ at p<.005. 2. A significantly positive relationship was found between popularity and background. The higher the economic level and father's education are, the more popular are they- in their classroom. They also were found to have their own houses. On the contrary, the less the economic level and father's education are, the less popular are they in their classroom. They, in most cases, live in rent houses. 3. A positive relationship was not found between popularity and clothing behaviors.