• Journal of Digital Convergence
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• v.14 no.8
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• pp.47-56
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• 2016

This study is on the actual analysis of R&D investment effect through DEA in terms of efficiency resulted from forestry sector climate change response R&D project. Namely, it is clarifying the mechanism of the scientific, technological, social performance result and output, depending on research development cost, employment size as same input. Also, it is in-depth analysis on which performance operates more efficiently in any detailed business. With the study result, we seek political implications to enhance investment effect and core element to consider R&D business project in the future.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.47 no.6
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• pp.1-9
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• 2010

In this paper, we propose an efficient compression method of the integral images. The integral imaging is a well-known technique to represent and record three-dimensional images. The proposed method is based on three dimensional discrete cosine transform (3D-DCT). The 3D-DCT techniques for the integral images have been reported as an efficient coding method for the integral images which reduces the redundancies between adjacent elemental images. The proposed method is a compression method efficient to integral images using adaptive block mode(ABM), based on the 3D-DCT technique. In the ABM, 3D-DCT blocks adaptive to the characteristics of integral images are constructed, which produces variable block size 3D-DCT blocks, and then 3D-DCTs for the 3D blocks are performed. Experimental results show that the proposed method gives significant improvement in coding efficiency. Especially, at the high bit-rates, the proposed method is more excellent since the overhead incurred by the proposed method take less part of the total bits.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.15 no.2
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• pp.27-48
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• 2004

Research and development projects in Research and development projects in Korea are ineffectively conducted due to the lack of a system for effectively planning, conducting and disseminating the result of the research projects. In this study, we have designed a framework for system that can be used in the planning and managing stage of National R & D information to guarantee standardization and extendability of the information. A national R & D technology information portal system for managing the distributed national R & D information on a single database is suggested based on this framework for the construction of a more effective information support system and the dissemination of national R & D information between researchers.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.59.1-59.1
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• 2011

BSF 후면전계효과는 태양전지의 개방전압 증가를 결정하며 효율에 매우 중요한 요인이다. 본 연구에서는 p-type에서의 후면전계효과를 확인하기 위해 PC1D 시뮬레이션(Simulation)을 통해 p+ 영역의 표면농도와 깊이에 따른 전기적 특성을 분석 하였다. 최적효율을 찾기위해 면저항을 $30{\Omega}/{\square}$으로 고정하고 깊이와 표면 농도값을 가변하였다. 최적화 결과 표면농도값이 작아지고 깊이가 커질수록 효율이 좋아지는 경향이 나타났으며 Peak doping=$5{\times}10^{18}cm^{-3}$, Juction depth=12.52um에서 최고효율 19.14%를 얻을 수 있었다. 본 시뮬레이션을 바탕으로 실제 태양전지 제작 과정에 적용 가능하다. p-type 태양전지 제작에서 후면의 p+ 영역의 깊이를 증가시키고, 표면 농도를 낮추는 공정을 통해 효율향상을 기대 할 수 있다.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.291-305
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• 2017

대전은 전국에서 R&D투자가 많은 지역으로 이는 출연연 및 출연연 출신 연구원의 기술창업의 증가로 나타나는 현상으로 볼 수 있다. R&D가 많이 투자됨에 따라 이에 따른 효율성에 대한 분석들이 많이 이루어지고 있으며, 주로 R&D 투자가 대한 지역내총생산, 기업의 생산성 등에 미치는 영향 즉 R&D투자의 효율성 분석을 많이 하고 있다. 본고에서는 지역 R&D투자가 기업의 생산성에 어느 정도 영향을 미치는 지를 분석하였다. 특히 지역특화(전략)산업 분야별로 분석하여 지역 R&D 투자의 효율적 배분을 위한 전략방안을 제시하고자 한다. 이러한 분석을 위해서 생산성에 대한 대리변수로 종업원 1인당 매출액 종업원 1인당 부가가치를 종속변수로 설정하였고, 독립변수로 연구개발비, 종업원 1인당 영업이익, 종업원 1인당 자본집약도 등의 변수를 다중회귀모형으로 실증분석 하였다. 분석결과 R&D투자가 매출액과 부가가치에 유의한 영향을 미치지만, 연구개발비가 매출액이나 부가가치 등 생산성 증가에 결정적인 요인으로 나타나지 않았다. 산업별 분석결과 정보통신, 바이오산업보다 부품소재 산업에서 결정계수가 높게 나왔다. 또한 조절회귀모형을 설정하여 조절효과를 분석한 결과 R&D투자는 매출액에 영향을 미치지만, 부가가치는 조절효과가 발생하지 않았다. 이는 지역 R&D투자의 효율적 배분 측면에서 투자의 활성화를 이루고 연구개발 투자가 실질적으로 기업의 생산성 증가에 기여할 수 있도록 견인해야 할 것이다.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.538-539
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• 2012

수냉형 인버터는 냉각 시 칠러를 사용하게 되는데 칠러는 입력 냉각수의 온도가 높을수록 열교환 효율이 높아져 소비전력이 감소한다. 하지만 인버터는 입력 냉각수의 온도가 높을수록 손실이 증가하게 되므로 수냉형 인버터는 각각의 출력 부하에 따라 최대 효율 점이 존재한다. 본 논문에서는 각각의 출력 부하에서 냉각수 온도 제어를 통해 수냉형 인버터의 최대 효율점을 추적하는 방법을 제안한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.4
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• pp.31-37
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• 2010

In this paper, highly efficient dual-band class-F power amplifiers(PAs) for cellular and WLAN bands are suggested and implemented. For the first step, single-band class-F amplifiers at 840MHz, 2.4GHz are designed using commercial E-pHEMT FETs. The performance of two single band PAs are as much as 81.2% of efficiency with the output power of 24.4dBm with 840MHz PA and 93.5% of efficiency with 22.4dBm from the 2.4GHz. For the dual-band class-F PA, the harmonic controlling circuit with ideal SPDT switch was suggested. The length of transmission line is variable by a SPDT switch. As a results, the operation in 840MHz showed the peak efficiency of 60.5% with 23.5dBm, while in 2.4GHz mode the efficiency was 50.9% with the output power of 19.62dBm. Besides, it is shown that the harmonic controller of class-F above 2Ghz could be implemented on the low cost FR-4 substrate.

• Journal of Energy Engineering
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• v.24 no.4
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• pp.97-104
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• 2015

The performance in scientific contribution of renewable energy R&D has been overlooked, as it is shown in terms of industrial aspect. This paper analyzed the R&D efficiency of scientific aspects of each renewable energy resource in 2008-2012. Total R&D fund and the number of supported projects are selected as input variables, and the number of patents and papers as output variables to analyze the direct efficiency using DEA method. Through the analysis, it determines the efficiency of each energy resource R&D, and investigated the causes of inefficiency. This study has meaning to include entire renewable energy sources for the analysis, and is expected to serve as an important reference in policy making.

• Journal of Technology Innovation
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• v.28 no.3
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• pp.1-28
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• 2020

This study examines whether the firm with high innovation efficiency realizes high operating performance. We measured innovation efficiency by the ratio of patent applications for R&D expenditure or R&D stock and measured operating performance by the ratio of operating income or operating cash flow to total assets for the following year. The sample consists of 1,880 manufacturing firm-years, which listed on the Korean Exchange between 2014 and 2017. We analyze the effect of innovation efficiency on operating performance using a model of Hirshleifer et al. (2013) results show that both innovation efficiency variables have a significantly positive relationship with the total asset operating margin. Besides, the following year's performance, measured by the total asset operating cash flow ratio, also shows a positive relationship with the two innovation efficiency variables at the 5% and 1% significance levels, respectively. The results indicate that high innovation efficiency firms that link the outcomes of R&D to more patent applications realize higher operating performance. Also, we divided the R&D-intensive and non-R&D-intensive industries and performed the same analysis. As a result, the innovation efficiency has a significant positive effect on operating margin in both industries. However, the effect of innovation efficiency on the operating cash flow is only significant in R&D-intensive industries. This study suggests that the effects of innovation efficiency are more consistent in the R&D-intensive industry. Additionally, we divided the high patent application and low patent applications industries and performed the same analysis. As a result, the innovation efficiency has a significant positive effect on operating margin in both industries. This study suggests that the effects of innovation efficiency are more consistent in the high patent application industry. We show that a firm's innovation efficiency is a critical factor for a firm's performance, while prior studies on the R&D performance have not considered the innovation efficiency of each firm. The evidence suggests that firms not only consider R&D expenditures but also improve the performance of companies by increasing innovation efficiency. Investors need to consider their innovation efficiency when evaluating the value of firms.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.9
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• pp.41-45
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• 2014

In this paper, a high-efficiency power amplifier is implemented by using a drain bias control circuit operated at low input power for WPT(Wireless Power Transfer). Adaptive bias control circuit was added to high-efficiency class-E amplifier. It was possible to obtain the overall improvement in efficiency by adjusting the drain bias at low input power. The proposed adaptive class-E amplifier is implemented by using the input and output matching network and serial resonant circuit for improvement in efficiency. Drain bias control circuit consists of a directional coupler, power detector, and operational amplifier for adjusting the drain bias according to the input power. The measured results show that output powers of 41.83 dBm were obtained at 13.56 MHz. At this frequency, we have obtained the power added efficiency(PAE) of 85.67 %. It was confirmed increase of PAE of an average of 8 % than the fixed bias from the low input power level of 0 dBm ~ 6 dBm.