• Journal of Radiation Protection and Research
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• v.38 no.4
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• pp.242-245
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• 2013

Monte Carlo method was applied to discriminate the external contamination on radiation workers in nuclear power plants for internal dose assessment generally used with a bed type scanning detector whole body counter. Korean voxel model with internal contamination was used to estimate the detection patterns of whole body scanning. Also, the BOMAB model with various external contamination was assumed to compare with detection of radionuclides inside the human body. From the comparison of detection efficiency between front and back side up, external contamination was easily distinguished.

• KDI Journal of Economic Policy
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• v.34 no.2
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• pp.17-40
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• 2012

We study externality costs of capital investment under limited commitment. We solve for the constrained efficient allocation with a limited commitment environment and find positive externality costs of capital investment provided that full-risk-sharing is not feasible. In a decentralized version of limited commitment environment, a one unit increase of capital investment by an agent increases all individuals' autarky values in the economy and generates externality costs in the economy. This externality cost provides a rationale for positive capital taxation even in the absence of government expenditure. In order to internalize this costs, the government use a positive rate of linear capital tax in the decentralized economy.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.425-428
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• 2002

To understand and forecast the wireless internet market in Korea, we will analyse the network externalities in wireless internet market into communication network externalities and hardware/software network externalities. The wireless market has two competing streams, one is mobile internet and the other is wireless fan internet. Both are characterized by strong network externalities which lead to increasing return to stale. Mobile internet is supposed more suitable for communication and WLAN for data. However these two system will compete in some area, and the critical factor to deride the winner is supposed to be the network externalities as in so many other high-tech industries had showed.

• Journal of Biomedical Engineering Research
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• v.20 no.1
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• pp.69-73
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• 1999

In this paper, an algorithm based on Snakes is proposed to detect the boundary of 3D images. From the first-slice MR image, the boundary of an object is detected manually. The detected boundary points are used as initial control points for detecting the boundary of the next MR image. To detect the boundary from the rest of MR images automatically, an energy term using spatial correlation between adjacent images is added to the Greedy Snakes energy formulation. A measure of shape similarity called BMD was used to evaluate the accuracy of the proposed algorithm. The average BMD value for the proposed algorithm's result is higher than Greedy algorithm's showing the utility of the proposed method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.7B
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• pp.806-817
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• 2011

This paper constructed a model estimating mobile nework externalities based on Ofcom model and estimated externalities mark-up. The main results are as follows: 1) there are 15,626,711 marginal subscribers in mobile network irrespective of its maturity. 2) the value of network externalities ranges 2.1 billions won to 435.4 billions won. 3) the extrenalities mark-up to support marginal subscribers ranges 0.03 won to 6.47 won. This results provide useful implications to policy about mobile network terminations fee as well as externalities mark-up disputes.

• 한국벤처창업학회:학술대회논문집
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• 2018.11a
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• pp.225-230
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• 2018

본 연구는 기술사업화 역량과 외부기술획득활동이 신제품개발성과에 미치는 영향에 대한 연구이다. 최근의 기술창업기업은 기존 조직 내부의 기술들 이외에 외부의 다양한 기술들을 들여와 기존 기술과 융 복합하여 기술 사업화를 도모하여 치열한 글로벌 경제 환경 속에서 경쟁력을 갖추기 위해 노력하고 있다. 정책적으로도 글로벌 경쟁력과 첨단기술을 갖춘 중소 벤처기업 육성 안이 대거 포함되어 기술기반의 기술창업기업을 창출하고 육성하여 기술사업화를 촉진하고 있다. 이와 더불어 기술사업화의 핵심적 요소로 간주되고 있는 기술사업화역량 및 외부기술획득활동은 여러 측면에서 연구되고 있다. 따라서 현 시점에서 기술기반의 기술창업기업의 창출과 지속적인 성장을 위해 기술사업화 역량과 외부기술획득활동이 신제품개발 성과에 미치는 영향을 검증함으로써 궁극적으로 기술창업기업의 신제품개발성과 향상을 위하여 어떤 노력을 해야 하는가를 규명하고자 하였다. 이를 위하여 기술창업기업을 대상으로 자료를 수집, 실증분석을 실시하였다. 본 연구결과는 향후 기술기반의 기술창업 기업의 기술사업화 역량과 외부기술획득활동이 신제품개발성과 향상을 위한 시사점을 제공할 뿐만 아니라 성공적인 기술사업화에 미치는 효과에 대한 연구 확산에도 기여할 수 있을 것이라고 판단된다.

• International Commerce and Information Review
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• v.15 no.3
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• pp.3-24
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• 2013

This study has examined the relationship between entrepreneurial orientation(EO), dynamic capability(DC) and export performance of international new ventures(INVs). Also, the moderating effect of external environment factors(the hostility at domestic markets and the industrial dynamics) were analysed. Empirical analysis was performed on 101 INVs. It was conducted using the PLS(Partial Least Square). The result of empirical analysis showed that there is a positive relationship between EO, DC and export performance. The result of moderating effect showed that two external environment factors have positive moderating effect on the relationship between EO and DC. However, there was not moderating effect of external environment factors on the relationship between DC and export performance.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.13 no.2
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• pp.101-113
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• 2018

This paper investigates the relationship between external search strategy and radical innovation performance. As the discrepancies that can exist among the varying sources of external knowledge is overlooked, the existing literature on the effect of external search strategy on radical innovation performance remains inconclusive. This study aims to reconcile such mixed findings by recognizing that external knowledge can be distinctive depending on the environment in which its source is embedded in; specifically, this paper examines the relationship between external search strategy and radical innovation performance by distinguishing external search from 'market' and 'non-market' relationships. We test our hypotheses with a sample of 431 firms from the manufacturing industries from the 2010 STEPI survey. Our empirical findings suggest that external search strategy from market relationships positively influences radical innovation performance, while the influence of external search strategy from non-market relationships is found to be not significant. Our research suggests that in order to improve radical innovation performance, firms must be able to maintain a cooperative relationship with other actors connected with market relationships and to effectively exploit the market knowledge obtained from these actors.

• Journal of Mushroom
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• v.11 no.4
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• pp.214-218
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• 2013

This study was carried out to find out suitable input method for air exchange about bottle cultivation of oyster mushroom. There was no difference of average temperature in cultivation room, but T1(direct introduction of outside air) was higher than T2(heat exchanger) and T3(air buffer) in the standard deviation. The ratio of cooling operating was the highest in August and in the descending order, T1 54%, T3 43%, T2 33%. At ratio of energy reduction, T2 and T3 were higher than T1. The operating ratio of heater was highest in January and in the descending order, T1 53%, T3 37%, T2 30%. At ratio of energy reduction(%), T2 and T3 were higher than T1 similar to result of cooling operating. Therefore there were largest in August about Cooling Degree-Hour and in January about Heating Degree-Hour. And fruitbody yields quality was excellent in T2 and T3 than T1. The suitable effective type of air exchange in oyster mushroom cultivation are heat exchange and air buffer system.

• Journal of Korea Technology Innovation Society
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• v.21 no.3
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• pp.1077-1100
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• 2018

The present study analyzed the effect of firms' external research and development (R&D) on corporate productivity, while investigating the moderating effect of firm size on the external R&D-productivity nexus. In the empirical analysis, we estimated South Korean manufacturing firms' total factor productivity (TFP) using the firm level data drawn from the Survey of Business Activities (Korea National Statistical Office) for the years 2006-2015. Thereafter, focusing on the role of external R&D and its interaction with the firm size in determining firms' TFP, the productivity function was estimated as well. To this end, we used ordinary least squares (OLS) and quantile regression to highlight the heterogeneous impacts of external R&D by companies' productivity level. Empirical results confirmed that firms' external R&D significantly enhanced corporate productivity in all manufacturing industries, from high-tech to low-tech. The moderating effect of firm size in determining the productivity effect of external R&D was not as prominent as in the case for internal R&D, which exhibited some degree of the size premium in the productivity-enhancing effect. These results suggest that regardless of the firm size, external R&D can be an important channel for corporate productivity improvement, and can be a particularly effective strategy for SMEs with relatively limited internal R&D capacities.