• 디지털융복합연구
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• 제12권1호
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• pp.1-12
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• 2014

2020년 무렵 한국사회는 급속한 정보통신기술(ICT)발전에 따른 디지털 양극화의 심화문제와 함께, 100만 명에 이르는 본격적인 다문화사회가 시작될 것으로 예상되는 점에서, 본 연구는 이러한 시대도래에 적합한 정보격차를 해소하는 다문화정책에 대한 논의를 전개하였다. 따라서 이러한 새로운 패러다임 변화환경 아래에서의 한국 다문화 가족 관련 정보서비스가 확대 및 강화되는 미래전략방향을 탐색하였다. 본 논문에서는 이를 위해 바람직한 미래상을 시나리오플래닝을 통하여 고찰하여 보고 이의 달성을 위한 향후 추진방향을 모색하였다. 그 결과 ICT에 기반을 둔 데이터 서비스통합형의 개방된 플랫폼 전자정부 구축이 향후 한국 다문화사회에 있어서의 바람직한 미래상으로 제시되었다.

• 한국ITS학회 논문지
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• 제3권2호
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• pp.55-68
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• 2004

본 연구에서는 고속도로 교통정보의 적정 가치를 산정하고자 비 시장재의 가치 추정에 많이 적용되고 있으며 환경경제학 분야에서 발전되어온 조건부 가치측정법을 사용하였다. 비 시장재인 고속도로 교통정보의 적정한 가치를 추정하기 위하여 가상 시나리오를 설계하고 설문의 신뢰도를 높이기 위하여 교통관련 분야의 전공자를 설문자로 하였으며 일대일 면접을 실시하였다. 또한 질문 방법으로 개방형 질문과 지불카드 방법을 혼용하여 사용하였다. 교통정보의 가치추정식으로 다중회귀 모형을 사용하여 교통정보의 가치에 영향을 미치는 정도를 알아보았다. 연구결과 정보별 1회 이용시 지불하고자 하는 가격은 현재 제공되는 가격보다 다소 비싼 가격을 지불할 의사를 보였으나 전체적인 가격을 묻는 월정액은 낮게 지불의사를 표시하였다. 이는 개별적인 정보에 대한 가치나 유용성은 수긍하나 공공의 정보는 무료로 제공되어야 한다는 다수 이용객들의 인식이 지불 의사를 낮게 표시한 것으로 판단된다.

• 수산경영론집
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• 제42권3호
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• pp.31-39
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• 2011

This paper attempts to extend such analysis to the rather more difficult problem of optimal management of transnational fish stocks jointly owned by two countries. Transboundary fish such as Mackerel creates an incentive to harvest fish before a competitor does and leads to over-exploitation. This tendency is especially poignant for transnational stocks since, in the absence of an enforceable, international agreement, there is little or no reason for either government or the fishing industry to promote resource conservation and economic efficiency. In the current paper I examine a game theoretic setting in which cooperative management can provide more benefits than noncooperative management. A dynamic model of Mackerel fishery is combined with Nash's theory of two countries cooperative games. A characteristic function game approach is applied to describe the sharing of the surplus benefits from cooperation and noncooperation. A bioeconomic model was used to compare the economic yield of the optimal strategies for two countries, under joint maximization of net benefits in joint ocean. The results suggest as follows. First, the threat points represent the net benefits for two countries in absence of cooperation. The net benefits to Korea and China in threat points are 2,000 billion won(${\pi}^0_{KO}$) and 1,130 billion won(${\pi}^0_{CH}$). Total benefits are 3,130 billion won. Second, if two countries cooperate one with another, they reach the solution payoffs such as Pareto efficient. The net benefits to Korea and China in Pareto efficient are 2,785 billion won(${\pi}^0_{KO}$) and 1,605 billion won(${\pi}^0_{CH}$) or total benefits of 4,390 billion won : a gain of 1,260 billion won. Third, the different price effects under the two scenarios show that total benefit rise as price increases.

• 한국전산유체공학회지
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• 제21권4호
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• pp.40-45
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• 2016

The numerical simulation has been performed to predict the performance of the fire suppression system for cabin of shipboard enclosure. The present study aims ultimately at finding the optimal parametric conditions of the mist-injecting nozzles using the CFD methods. The open numerical code was used for the present simulation named as FDS (Fire Dynamics Simulator). Application has been done to predict the interaction between water mist and fire plume. In this study, the passenger cabin was chosen as simulation space. The computational domains for simulation in the passenger cabin were determined following the fire scenario of IMO rules. The full scale of the flow field is $W{\times}L{\times}H=4{\times}3{\times}2.4m^3$ with a dead zone of $W{\times}L{\times}H=1.22{\times}1.1{\times}2.4m^3$. The water mist nozzle is installed in ceiling center of 2.3 m height from the floor, and there are six mattresses and four cushions in the simulation space. The combination patterns of orifices to the main nozzle and the position to install nozzles were chosen as the simulation parameters for design applications. From the present numerical results, the centered-located nozzles having evenly combined orifices were shown as the best performance of fire suppression.

• 한국산학기술학회논문지
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• 제16권3호
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• pp.1824-1831
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• 2015

본 연구에서는 가치혁신역량 진단툴(VIQ)를 활용하여 중소기업의 가치혁신역량을 진단하고 조직혁신전략의 방향을 설정한 사례를 고찰하여 시사점을 도출한다. 조직내 가치혁신을 이루기 위하여 조직내 가치혁신역량이 어느 정도 되는지 측정하는 툴이 바로 가치혁신역량 진단툴인 VIQ(Value Innovation Quotient)이다. 조직내에서는 이러한 가치혁신툴을 통하여 조직혁신역량을 진단하는 것을 넘어서 조직혁신 방향을 설정할 수 있다. 본 연구에서는 이러한 진단툴을 활용하여 실제로 대덕특구 내에서 성장하고 있는 IT기업을 선정하여 분석하고 이를 바탕으로 혁신전략을 수립한다. VIQ결과를 반영하여 혁신전략은 3가지로 도출되었다. 첫째, 급변하는 외부환경에 대응하기 위하여 비즈니스 인텔리스전스 활동 및 시나리오 플래닝 등 유연한 전략계획 체계를 구축한다. 둘째, 의사결정 차원에서 신속한 의사결정 체계를 구축한다. 셋째, 이러한 전략실행의 기반이 될 수 있도록 유연한 조직체계를 구축한다. 즉, 임파워먼트 및 유연한 의사소통체계를 구축한다. 본 기업분석 사례와 같이 변화와 혁신의 중요성은 많은 기업이 인지하면서도 이러한 변화와 혁신의 잠재력을 측정하기는 쉽지 않으나 VIQ를 활용하여 기업의 현재 혁신역량을 진단하고 향후 대응방안을 모색할 수 있다.

• 한국도로학회논문집
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• 제20권2호
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• pp.57-65
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• 2018

PURPOSES : The study aims to predict the service life of national highway asphalt pavements through deep learning methods by using maintenance history data of the National Highway Pavement Management System. METHODS : For the configuration of a deep learning network, this study used Tensorflow 1.5, an open source program which has excellent usability among deep learning frameworks. For the analysis, nine variables of cumulative annual average daily traffic, cumulative equivalent single axle loads, maintenance layer, surface, base, subbase, anti-frost layer, structural number of pavement, and region were selected as input data, while service life was chosen to construct the input layer and output layers as output data. Additionally, for scenario analysis, in this study, a model was formed with four different numbers of 1, 2, 4, and 8 hidden layers and a simulation analysis was performed according to the applicability of the over fitting resolution algorithm. RESULTS : The results of the analysis have shown that regardless of the number of hidden layers, when an over fitting resolution algorithm, such as dropout, is applied, the prediction capability is improved as the coefficient of determination ($R^2$) of the test data increases. Furthermore, the result of the sensitivity analysis of the applicability of region variables demonstrates that estimating service life requires sufficient consideration of regional characteristics as $R^2$ had a maximum of between 0.73 and 0.84, when regional variables where taken into consideration. CONCLUSIONS : As a result, this study proposes that it is possible to precisely predict the service life of national highway pavement sections with the consideration of traffic, pavement thickness, and regional factors and concludes that the use of the prediction of service life is fundamental data in decision making within pavement management systems.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
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• pp.231-236
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• 2001

Virtual Reality (VR) is a new technology that enables humans to communicate with a computer, It allows the user to see, hear, fuel and interact in a three-dimensional virtual world created graphically. Virtual Reality Therapy (VRT), based on this sophisticated technology, has been recently used in the treatment of subjects diagnosed with acrophobia. Acrophobia is a disorder that is characterized by marked anxiety upon exposure to heights, avoidance of heights, and a resulting impairment in functioning. Conventional virtual reality systems for the treatment of acrophobia have limitations, such as overly expensive devices or somewhat unrealistic graphic scenes. The goal of this study is to develop an inexpensive and more realistic virtual environment in which to perform an exposure therapy fur acrophobia. It runs on a personal computer, and a virtual scene ova bunge-jump tower in the middle of a large city. The virtual scenario includes an open tin surrounded by props beside a tower, which allows the patient to feel a sense of heights. The effectiveness of the VR environment was evaluated through the clinical treatment of a subject who was suffering from the fear of heights. Based on pre- and post- questionnaires and subjective comments from the subject. This virtual reality environment proved to be an effective and realistic tool fur the treatment of acrophobia.

• 한국산업정보학회논문지
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• 제17권3호
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• pp.95-104
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• 2012

기업은 SNS를 홍보 및 마케팅, 고객관리에 적극 이용하고 있다. 그러나 SNS는 고객의 의견과 아이디어를 수집하고 기업 내 외 관계자들의 협업을 도모하는 Co-creation을 실현하기에는 부족한 기능이 있다. 본 연구의 목적은 기업과 소비자의 상호연계를 통한 가치를 공동 창출하는 Co-creation을 위한 SNS의 플랫폼을 설계하는 것이다. 이를 위해 기존의 SNS의 문제점을 파악하고 SNS의 플랫폼 설계를 위한 고려사항으로 애플리케이션의 활용, 클라우드 서비스와의 연동, 기업 시스템과의 연동을 설계의 주요 요소로 정의 하고 각 요소별로 플랫폼을 설계하였으며 이를 통합한 플랫폼의 모형을 제시하였다. 설계된 플랫폼은 가상의 시나리오를 통해 그 타당성을 살펴보았다. 본 연구의 시사점으로는 Co-creation을 SNS와 접목하여 기업과 소비자 간의 공동 가치창출을 위해 소통의 효과와 효율을 극대화 시킬 수 있는 SNS의 플랫폼 설계에 관한 연구가 처음으로 시도되어 후속 연구를 유발하였다는 점이다.

• Ocean and Polar Research
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• 제34권2호
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• pp.239-251
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• 2012

The food web dynamics in a coastal ecosystem of Korea were predicted with Ecosim, a trophic flow model, under various scenarios of primary productivity due to ocean warming and ocean acidification. Changes in primary productivity were obtained from an earth system model 2.1 under A1B scenario of IPCC $CO_2$ emission and replaced for forcing functions on the phytoplankton group during the period between 2020 and 2100. Impacts of ocean acidification on species were represented in the model for gastropoda, bivalvia, echinodermata, crustacean and cephalopoda groups with effect sizes of conservative, medium and large. The model results show that the total biomass of invertebrate and fish groups decreases 5%, 11~28% and 14~27%, respectively, depending on primary productivity, ocean acidification and combined effects. In particular, the blenny group shows zero biomass at 2080. The zooplankton group shows a sudden increase at the same time, and finally reaches twice the baseline at 2100. On the other hand, the ecosystem attributes of the mean trophic level of the ecosystem, Shannon's H and Kempton's Q indexes show a similar reduction pattern to biomass change, indicating that total biomass, biodiversity and evenness shrink dynamically by impacts of climate change. It is expected from the model results that, after obtaining more information on climate change impacts on the species level, this study will be helpful for further investigation of the food web dynamics in the open seas around Korea.

• Journal of Power Electronics
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• 제16권5호
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• pp.1904-1917
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• 2016

The moving average filter (MAF) is widely utilized to improve the disturbance rejection capability of phase-locked loops (PLLs). This is of vital significance for the grid-integration and stable operation of power electronic converters to electric power systems. However, the open-loop bandwidth is drastically reduced after incorporating a MAF into the PLL structure, which makes the dynamic response sluggish. To overcome this shortcoming, some new techniques have recently been proposed to improve the transient response of MAF-based PLLs. In this paper, a comprehensive performance comparison of advanced MAF-based PLL algorithms is presented. This comparison includes HPLL, MPLC-PLL, QT1-PLL, and DMAF-PLL. Various disturbances, such as grid voltage sag, voltage flicker, harmonics distortion, phase-angle and frequency jumps, DC offsets and noise, are considered to experimentally test the dynamic performances of these PLL algorithms. Finally, an improved positive sequence extraction method for a HPLL under the frequency jumps scenario is presented to compensate for the steady-state error caused by non-frequency adaptive DSC, and a satisfactory performance has been achieved.