• KIISE Transactions on Computing Practices
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• v.21 no.9
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• pp.610-615
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• 2015

The accuracy and precision of video-based remote gaze trackers is affected by numerous factors (e.g. the head movement of the participant). However, it is challenging to control all factors that have an influence, and doing so (e.g., using a chin-rest to control geometry) could lead to losing the benefit of using gaze trackers, i.e., the ecological validity of their unobtrusive nature. We propose an adaptive zoom-based gaze tracking technique, ZoomTrack that addresses this problem by improving the resolution of the gaze tracking results. Our approach magnifies a region-of-interest (ROI) and retrieves gaze points at a higher resolution under two different zooming modes: only when the gaze reaches the ROI (temporary) or whenever a participant stares at the stimuli (omnipresent). We compared these against the base case without magnification in a user study. The results are then used to summarize the advantages and limitations of our technique.

• Journal of KIISE
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• v.42 no.7
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• pp.910-918
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• 2015

This paper presents a parameter visualization technique to overcome the limitation of the naked eye in contrast-enhanced ultrasonography. A method is also proposed to compensate for the distortion and noise in ultrasound image sequences. Meaningful parameters for diagnosing liver disease can be extracted from the dynamic patterns of the contrast enhancement in ultrasound images. The visualization technique can provide more accurate information by generating a parametric image from the dynamic data. Respiratory motions and noise from micro-bubble in ultrasound data may cause a degradation of the reliability of the diagnostic parameters. A multi-stage algorithm for respiratory motion tracking and an image enhancement technique based on the Markov Random Field are proposed. The usefulness of the proposed methods is empirically discussed through experiments by using a set of clinical data.

• Korean Journal of Social Welfare Studies
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• no.36
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• pp.253-280
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• 2008

Previous research indicates that depressive symptoms and alcohol consumption are highly correlated with each other. However, there is lack of consensus on the causal relationship between depressive symptoms and alcohol use. In order to address this limitation, this paper examines causal relationship between the two variables using non-recursive structural equation modeling, controlling sociodemographic and psycho-socio-behavioral variables. Data included 14,469 community dwelling individuals who participated in Korea Welfare Panel Study in 2006. Results showed that the effects of alcohol consumption on depressive symptoms was statistically significant, whereas the effects of depressive symptoms on alcohol consumption was not. Significant portions of the effects of psycho-socio-behavioral variables on depressive symptoms were indirect through their effects on alcohol consumption. Based on the results, implications for intervention and future research were discussed.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.207-207
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• 2016

최근 2년 간 한반도에 내린 강수량은 평년에 비해 60%정도 밖에 내리지 않았다. 이로 인해 2015년에는 전국 곳곳에서 가뭄이 발생하였고, 농작물피해, 이수부분에서 어려움을 겪었다. 지역적으로 가뭄피해를 해소하고자 여러 대책이 강구되고 있고, 국가적으로 가뭄을 극복하기 위해 국가가뭄정보분석센터의 개소 등 기상, 수문정보를 바탕으로 한 가뭄 해소 노력이 증대되고 있다. 기상청에서는 기상확률예보를 통해 단기적인 강수, 가뭄 예측자료를 제공하고 있으며, 전지구모델을 상세화 한 지역기후모델을 통해 한반도 전 지역에 대해 기후변화시나리오에 의한 강수, 기온자료를 제공하고 있다. 가뭄을 예측하고, 가뭄정도를 파악하기 위해서 가뭄지수를 보편적으로 이용하고 있다. 강수와 기온은 기상학적 가뭄지수 산정에 가장 중요한 인자로 이용되고 있다. SPI는 강수자료를 이용하여 가뭄정도를 파악할 수 있는 지수이고, RDI는 강수와 기온자료를 통해 잠재 증발산량을 산정하고, 이를 고려하는 가뭄지수이다. 한반도 내 주요 관측소지점에 대해 RCP 8.5 시나리오에 의한 장래 2100년까지 가뭄지수를 산정한 결과 RDI의 경우 가뭄발생빈도와 강도가 점차 증가하는 것으로 나타났다. 장래 한반도의 연 강수량은 크게 감소하지 않는데 비해 기온은 점차 증가하는 경향이 발생함에 따라 기온상승에 의한 증발산량의 증가가 극한가뭄이 발생하는 주요요인으로 판단되었다. 수도권지역의 경우 예측기간이 2100년에 가까울수록 SPI에 의한 가뭄지수는 점차 증가하여 가뭄 강도가 약해지는 것으로 예측되었고, RDI지수에 의한 가뭄지수는 점차 감소하여 극한가뭄이 발생할 가능성이 증가하는 것으로 나타났다. 본 연구 결과를 통해 장래 가뭄에 의한 피해지역 예측, 수자원 계획, 이수분야에 활용될 수 있을 것으로 기대된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.5
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• pp.187-194
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• 2019

Traditional demand forecasting methods are difficult to meet the needs of companies due to rapid changes in the market and the diversification of individual consumer needs. In a diversified production environment, the right demand forecast is an important factor for smooth yield management. Many of the existing predictive models commonly used in industry today are limited in function by little. The proposed model is designed to overcome these limitations, taking into account the part where each model performs better individually. In this paper, variables are extracted through Gray Relational analysis suitable for dynamic process analysis, and statistically predicted data is generated that includes characteristics of historical demand data produced through ARIMA forecasts. In combination with the LSTM model, demand forecasts can then be calculated by reflecting the many factors that affect demand forecast through an architecture that is structured to avoid the long-term dependency problems that the neural network model has.

• Journal of Korea Port Economic Association
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• v.23 no.2
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• pp.41-61
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• 2007

After the joining in the WTO of China, the container throughputs have begun to increase notably and Continuous developments of China ports are influencing operation and policy of Korea ports. At this point Pyeongtaek Dangjin port which has potency as China trading port confronts with turning point of port development as new port. To this, correct need grasping of North China shippers is important strategic element of PyeongTaek Dangjin Port activation. In this study, there is purpose to present Pyeongtaek Port's activation strategy by grasping customer needs executing questionnaire to China local company about Pyeongtaek Dangjin Port. As a research result, Pyeongtaek Dangjin Port possesses high geographical strength but has problems like development delay, tribe of various route, absence of marketing strategy. To solve this problem, this paper proposes expansion of port and logistics physical distribution equipment, improvement of services, foundation of joint logistics center, establishment of marketing organization etc. Namely, it may overcome only new port's limitation though develop to port of cargo creation style that is not simple cargo dependence style port.

• Journal of Advanced Navigation Technology
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• v.25 no.5
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• pp.415-425
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• 2021

In line with the trend of the digital transformation, the financial sector is providing financial services with new technologies. Among them, the open banking, which is drawing attention from global financial industry, is a service environment that maximizes customers' convenience and data utilization. In addition, the shift in the digital paradigm has also increased anxiety that security problems such as hacking and information leakage caused by data sharing are also concerned. A failure to overcome the negative view will hinder the development of financial services. This study presents a security governance system that can safely and comprehensively manage data in a digital financial ecosystem. This prepares a technical application plan by presenting a digital financial security architecture to field workers, focusing on the open banking service environment. It can be seen that this study is worthwhile by presenting a comprehensive information protection system that allows financial IT to introduce and utilize open banking services in a changing environment.

• Journal of Korea Technology Innovation Society
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• v.21 no.4
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• pp.1237-1267
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• 2018

After independence in 1945, the South Korean economy rose steadily from a developing country to a developed country while, after independence in 1960, Nigeria is still a developing country with poverty on the increase, despite its large amount of natural resources. This research seeks to find a viable solution to this issue while studying the relationship that exist amongst Economic Development Plans (EDPs), National Innovation System (NIS) and economic development in Korea. The methodology used herein is a mixture of a systematic literature review and a semi-structured interview. The results of this study show that EDPs are essential to the enhancement of communication, and the flow of knowledge and innovation of the NIS. Furthermore, our result shows that the efficiency of the NIS is relevant to drive economic growth and development. Therefore, based on our analysis of the current situation in Nigeria and the development trajectory of Korea, we developed, introduced and recommended a theoretical framework called the "Multiple skipping" development trajectory as a model for development in Nigeria.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.7
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• pp.801-806
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• 2019

Recently, each university has been lecturing a lot on the liberal arts subject by emphasizing software education. However, students are often motivated by the difficulty of learning programming, the inability to recognize why they should learn programming, or even the fact that they do not try. The reason for the resilience is to guide programming learning to have the power to recover from the point of abandonment to proceed with the learning again. In this study, recovery elasticity pre-post-examination was conducted on the parts that learned scratches and those that learned Python. Studies have shown that while Scratch appears to be trying to accept and work harder, Python has been relatively more difficult than Scratch. It is expected that this study will help identify the factors that can sustain programming learning.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.6
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• pp.690-696
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• 2019

New companies expecting market penetration by adopting technology commercialization process could face high uncertainty and constraints. In particular, ICT-based firms that enter competitive markets must deal with more complex situations. Although in-depth research has been done to solve the problem, there is still a lack of understanding of how startups' technology commercialization process is successful. To discuss the issue, this paper presents the technology commercialization model and determinants.(policy, finance, work team, organizational culture, overcoming the difficulties etc.) the suitability of the framework. From this analysis it emerged that the sustainability of organizational capabilities is as important as the adherence to the technology commercialization process for companies. As the organizational capacity has decreased, the driving force for technology commercialization has weakened. Therefore, the technology commercialization process does not guarantee the success of the market entry but is understood as a means of market access. If the organizational capacity is not strengthened, there is no successful technology commercialization process.