• Knowledge Management Research
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• v.25 no.2
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• pp.193-218
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• 2024

The current study investigated the factors influencing the buyer's repurchase intention for second-hand products. This study first identified perceived risk and purchase value as the two primary influencing variables. Additionally, some exogenous variables influencing these two variables were examined. Statistical analysis using Partial Least Squares (PLS) revealed that product uncertainty, seller uncertainty, and site trust had statistically significant relationships with perceived transaction risk. However, while economic benefit showed a significant impact on purchase value, product scarcity and resale value did not exhibit a significant relationship with purchase value. Perceived transaction risk was found to have an insignificant relationship with repurchase intention, but indirectly influenced repurchase intention through purchase value. Purchase value was identified as having a significant influence on repurchase intention. Therefore, it was concluded that purchase value is the most important factor influencing repurchase intention in the purchase of second-hand products, while transaction risk indirectly influences repurchase intention through purchase value. The study indicates that product uncertainty and economic benefit are the most significant exogenous factors influencing transaction risk and purchase value, respectively.

• Journal of Korea Technology Innovation Society
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• v.18 no.3
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• pp.492-515
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• 2015

Consideration of uncertainty has been considered to be an important factor in technology planning due to the fast changes of technologies and customer needs. Therefore, how to consider uncertainty has been a promising issue in developing and utilizing the technology roadmap, a prominent tool for the technology planning. However, previous studies regarding technology roadmaps are based on practical case studies for specific certain industries, which are of course useful but sometimes lack systematic frameworks and methodologies. In response, this study suggests a framework to identify possible scenario elements, analyze the impact of each scenario element and reflect the results to the technology roadmapping process. For this purpose, this study suggests a QFD-based framework that evaluates the relationship between scenario elements and the planning elements, and proposes a basic structure of scenario-based technology roadmaps to reflect the evaluation results to the technology roadmapping process.

• Journal of the Korea Computer Graphics Society
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• v.23 no.4
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• pp.21-29
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• 2017

Previous visual analytics researches has focused on reducing the uncertainty of predicted results using a variety of interactive visual data exploration techniques. The main purpose of the interactive search technique is to reduce the quality difference of the predicted results according to the level of the decision maker by understanding the relationship between the variables and choosing the appropriate model to predict the unknown variables. However, it is difficult to create a predictive model which forecast time series data whose overall trends is unknown such as youth physical growth data. In this paper, we pro pose a novel predictive analysis technique to forecast the physical growth value in small pieces of time series data with un certain trends. This model estimates the distribution of data at a particular point in time. We also propose a visual analytics system that minimizes the possible uncertainties in predictive modeling process.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.12 no.4
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• pp.335-344
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• 2014

The safety case program has been prepared for the development of the disposal facility of low- and intermediate-level radioactive waste in Korea. For the development of the radioactive waste disposal facility, this program can be applied for the safety demonstration of the facility and for the safety judgment of development step based on the international standards and domestic development environment. Systematic safety approach of this program includes the safety strategies such as optimization, robustness, demonstrability and defense-in-depth principle which are based on the safety principle and objectives. From the quality of assessment basis, safety arguments focused on the uncertainty management and the confidence building can assure the disposal safety during the step-wise safety assessment.

• Journal of Information Technology and Architecture
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• v.10 no.4
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• pp.537-552
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• 2013

Software-as-a-Service (SaaS) has led to paradigm shifts in the information management area by combining it with SOA and Mashup. System developers now have more chances to access various high-quality functions through API opened on the web. But external resources are controlled by service providers so that it raises the component's uncertainty in system management which is related to external resources. In the cloud environment, components related to external resources causes negative effects on system's maintainability by making them dependant on service providers. This study proposes a way to enhance maintainability by using stable external resources. For this work, we suggest the N+1-tier model in which an external resource tier is added to the N-tier model. After that, we analyze how adding an external resource tier affects the decreasing complexity of maintainability and improving maintainability on web application.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.65-65
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• 2023

최근 기후변화로 인해 홍수, 가뭄 등 수재해가 세계 곳곳에서 빈번하게 발생하고 있다. 이로 인해 정확한 강우-유출 해석의 중요도는 높아지고 있으며 강우-유출 해석에 따라 수자원 관리 및 계획수립의 정도가 달라질 수 있다. 본 연구 대상 지역인 메콩강 유역은 중국과 동남아시아 5개국(라오스, 태국, 미얀마, 베트남, 캄보디아)을 관통하는 국가공유하천으로 기초자료의 획득이 어렵고 국가별로 구축된 자료가 질적, 양적 품질이 상이하여 수문해석에서의 기초자료로 사용하기에 불확실성이 있다. 최근 기술의 발달로 글로벌 격자형 강수자료 획득이 용이함에 있어 미계측 대유역에서의 다양한 연구들이 수행되고 있지만, 지점강수자료와 시·공간적 오차로 인한 불확실성을 내포하고 있다. 이에 본 연구에서는 글로벌 격자형 강수자료의 적용성을 평가하기 위하여 지점 격자형 강수자료(APHRODITE)와 4개의 위성강수자료(CHIRPS, CMORPH, PERSIANN-CDR, TRMM)를 수집하고 합성곱 신경망 모형인 ConvAE 기법을 이용하여 위성강수자료의 시·공간 편의 보정을 수행하였다. 또한, 하천 수위에 대한 장기간 정보 수집이 가능한 메콩강 본류 4개 관측소(Luang Prabang, Pakse, Stung Treng, Kratie)를 선정하였으며 SWAT 모형을 이용하여 매개변수 보정(2004~2013)과 격자형 강수자료의 보정 전·후의 유출모의(2014~2015) 결과를 비교·분석하였다. 격자형 강우를 이용한 보정 및 유출 분석 결과 4개의 위성강수자료 모두 성능이 향상되었으며 그 중 보정된 TRMM이 가장 우수한 성능을 보여 해당 유역에서의 APHRODITE를 대체할 수 있다고 판단하였다. 따라서 본 연구에서 제시하는 ConvAE를 이용한 보정기법과 이를 이용한 강우-유출 해석은 향후 다양한 격자형 강수자료를 활용한 미계측 대유역에서의 수문해석에서 활용이 가능할 것으로 판단된다.

• Journal of Korean Society for Quality Management
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• v.42 no.4
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• pp.617-632
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• 2014

Purpose: This study aims to explore the relationship between the focal firm's interdepartmental cooperation and new product development (NPD) performance with focus on the moderating effect of environmental uncertainty. The basic hypothesized model is that there are positively associated relationships. Methods: The proposed research model was tested using structural equation modeling with 601 responses from multi-functional and multiple respondents in Korean manufacturing firms. Multi-group SEM analyses were conducted to explore the degree to which the hypothesized model was equivalent for different levels of environmental uncertainty. Results: Interdepartmental cooperation between R&D and production is positively associated with NPD performance under both higher and lower environmental uncertainties, while one between R&D and marketing is positively associated under only higher environmental uncertainty. Conclusion: This paper determined that NPD performance is positively correlated with R&D-production cooperation in a focal firm, and the relationship between R&D-marketing cooperation and NPD performance is positively moderated by level of environmental uncertainty. Consequently, this study suggests that it is always important for firms to put much effort on R&D-production cooperation for a better NPD performance, while R&D-marketing cooperation should be enhanced especially under higher environmental uncertainty than lower.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.259-265
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• 2011

유량조사 자료는 하천유역의 물순환 구조 파악, 하천시설의 설치, 각종 수공 구조물의 설계, 하천 주변지역의 이용 및 관리 등 수자원 계획을 위한 기초자료로 다방면에서 활용되고 있다. 국토해양부는 전국 수위관측소를 대상으로 매년 100여개 지점에서 유량조사을 실시하고 있으며, 측정된 성과에 대한 체계적인 품질관리와 연구개발을 통해 유량자료의 품질향상 및 안정화를 위해 노력하고 있다. 본 연구는 2010년도 유량조사사업에서 수행한 4대강 권역 12개 수계 153개 지점에서 수행된 유량 측정성과에 대해서 수리특성 분석, 최대구간유량비 분석, 하천폭에 따른 측선수 비교, 불확실도 분석을 수행하였다. 또한 개발된 수위-유량관계곡선식을 통하여 산정된 유량자료에 대하여 연유출률 평가, 상 하류간 유량 비교, 연유출총량 등을 비교하여 산정된 유량자료의 적절성을 검토하였다. 2010년 조사자료의 측선수 평균은 유속계 36.7개, 부자 14.3개, 최대구간유량비는 유속계 6.7%, 부자 13.9%, 불확실도는 유속계 4.0%, 부자 7.7%로 나타났다. 개발된 수위-유량관계곡선식을 활용해 산정된 유출률의 전체 평균값은 61%로 2009년에 비해 약 10% 크게 나타났다.

• Journal of Korea Water Resources Association
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• v.50 no.3
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• pp.155-167
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• 2017

Accurate QPE (Quantitative Precipitation Estimation) and the quality of the rainfall data for hydrological analysis are very important factors. Especially, the quality has a great influence on flood runoff result. It needs to know characteristics of the uncertainties in radar QPE for the reliable flood analysis. The purpose of this study is to present a probabilistic approach which defines the range of possible values or probabilistic distributions rather than a single value to consider the uncertainties in radar QPE and evaluate its applicability by applying it to radar rainfall. This study generated radar rainfall ensemble for the storms by the typhoon 'Sanba' on Namgang dam basin, Korea. It was shown that the rainfall ensemble is able to simulate well the pattern of the rain-gauge rainfall as well as to correct well the overall bias of the radar rainfall. The suggested ensemble technique represented well the uncertainties of radar QPE. As a result, the rainfall ensemble model by a probabilistic approach can provide various rainfall scenarios which is a useful information for a decision making such as flood forecasting and warning.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.566-573
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• 2005

Quality function deployment (QFD) is a useful tool for ensuring quality throughout each stage of the product development and production process. Since the focus of QFD is placed on the early stage, the uncertainty in the input information of QFD is inevitable. If the uncertainty is neglected, the QFD analysis results are likely to be misleading. This paper classifies the sources of uncertainty in QFD, and proposes a new approach to model and analyze the effects of uncertainty in QFD.