• 한국환경과학회지
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• 제8권4호
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• pp.473-477
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• 1999

The purpose of this study was to investigate the characteristics of removal efficiency for aromatic hydrocarbons using a high-temperature fiber filter on a laboratory scale. The main elemental compositions of a high-temperaure fiber filter are aluminium and silica, which can act as the catalysts. Benzene, toluene and o-xylene among aromatic hydrocarbons were used in this experiment. For 3cm thickness of fiber filter, these compounds were removed more than 90% at the face velocities of 3cm/sec and 5cm/sec above 45$0^{\circ}C$. For 4cm thickness of it, the removal efficiencies of these compounds were almost 90% from 40$0^{\circ}C$ at the same face velocities, suggesting that it may be due to increasing the contact time between the fiber filter and aromatic hydrocarbons. The pressure droop ranged from 22 to 48mmH2O for 3cm thickness of fiber filter. However, for 4cm thickness of it, it was about two times(41~89mm$H_2O$) higher than that for 3cm fiber thickness.

• 기술혁신연구
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• 제23권3호
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• pp.373-396
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• 2015

본 연구는 기술보증기금의 기술평가자료를 활용하여 고성장기업의 결정요인에 대하여 분석하였다. 본 연구가 기존 연구와 다른 점은 3가지이다. 첫째, 현재 고성장 기업이 아닌, 향후 고성장기업으로 성장할 기업의 결정요인을 분석하였다. 둘째, 고성장기업을 매출과 고용 2가지 측면에서 각각 구분하여 분석하였다 즉, 매출증가와 고용창출에서 모두 고성장을 달성한 경우, 고용창출 측면에서는 고성장을 기록했지만 매출증가 측면에서는 저성장인 경우, 그리고 매출증가만 고성장을 달성하고 고용창출은 저성장을 기록한 경우의 세 가지 유형으로 구분하여 분석하였다. 셋째, 기술보증기금 기술평가모형(KTRS)의 기술평가지표를 설명변수로 적용하였다. 분석결과, 기술의 수명주기상 위치가 적절하고 기술의 완성도가 높을 경우에는 향후 매출과 고용이 모두 고성장하고 있다. 기술인력관리가 잘 되는 기업은 고용측면에서는 고성장을 하지만 매출측면에서는 오히려 저성장하고 있다. 이러한 결과는 고용고성장기업이 주로 기술인력관리가 중요한 하이테크산업에서 발생될지도 모른다는 추론을 가능케 한다. 이에 하이테크산업 여부를 나타내는 더미변수를 추가하여 분석한 결과, 하이테크산업에 속한 기업은 고용고성장의 가능성이 높은 것으로 나타나 이러한 추론을 뒷받침하는 결과를 보였다.

• 한국정보통신학회논문지
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• 제19권3호
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• pp.674-682
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• 2015

RnD Service기업은 혁신을 지원하는 기업이며 비즈니스생태계를 촉진하는 바, 우리는 첨단산업의 활성화를 선도하는 RnD Service기업에 대한 사례연구를 통하여 독립경제로서 RnD Service기업을 확인할 수 있었다. 기업보고서 및 제반 인터뷰 통해서 RnD Service기업의 역할을 파악하고 RnD Service기업의 생성과 혁신과정을 분석하였다. RnD Service기업은 독립된 경제이지만 비용 극복이 어려워서 대학이나 연구기관에 종속될수록 지역의 혁신이 늦어진다는 우려도 있기 때문에 지역혁신의 주체로서 RnD Service분야는 제반 산업과 동반하여 성장할 수 있도록 RnD Service기업의 독립적인 기술사업화에 관심을 두어야 한다. 연구결과에 의하면 대전의 RnD Service의 비즈니스 모델은 대학이나 공공기관에 종속된 발전이 아니라 기업과 기업 간의 독립된 기술개발모델로서 혁신을 가져오는 주체로 성장해가는 고무적인 결과가 나타난다.

• 기술혁신학회지
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• 제1권2호
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• pp.231-244
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• 1998

The purpose of this analysis is to clarify the direction and nature of the future leading industries in Korea. Existing studies were analyzed in depth and their implications are as follows. Existing studies have not given a careful consideration for the structural adjustment of Korean economy and the atmosphere for the growth of prospective leading industries. In relation to the structural adjustment, the accomplishment of high value-added in existing industries and the promotion for high-tech industries as well as service industries should be the future direction of the future leading industries. In order to create atmosphere for the growth, it is crucial to achieve a social consensus about the nature of the prospective leading industries and is necessary to continue a concrete research on the related industries.

• Journal of the Korean Wood Science and Technology
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• 제30권3호
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• pp.91-96
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• 2002

This study was carried out to estimate the property of dimensional stability of heat compression of italian poplar wood with low density. Firstly, two levels of pressure conditions were applied using the closed and open-press system. The thermal treatment temperatures were 180℃ and 200℃, respectively. Water absorption tests were conducted in water bath at 25℃ and 100℃ for 35 hours and 1 hour, respectively. The compression rates of wood were 47 percent, 60 percent, and 73 percent, respectively. From these tests, it was found that the dimensional stability of the closed-press system was superior to that of the open-press system. Furthermore, the dimensional stability of compressed wood in the closed-press system was better at 200℃ than 180℃. In compression rate, dimensional stability of 73 percent compression rate was the best result. Considering these results, the best conditions for the dimensional stability of compressed wood were those of the closed-compressing system at high temperatures above 200℃ and larger compression rate. Therefore, it was concluded that the dimensional stability of wood is improved at higher temperature and larger deformation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.98-101
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• 1988

The purpose of the paper is to operate a high-dynamic-performance for ac servo system. It is describes a characteristics and stability regions by linearized control system of squarriel-cage induction motor. Designed control system are compose to slip-frequency vector control for controlled a scandary interlinked flux by PWM inverter.

• Journal of the Korean Physical Society
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• 제73권12호
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• pp.1827-1833
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• 2018

X-ray grating interferometry has been an active area of research in recent years. In particular, various studies have been carried out for the practical use of the x-ray grating interferometer in medical and industrial fields. For the commercialization of the system, it needs to be optimized for its application. In this study, we have developed a prototype of the compact high energy x-ray grating interferometer of which the high effective energy and compactness is of our primary feature of design. We have designed the Talbot-Lau x-ray interferometer in a symmetrical geometry with an effective energy of 54.3 keV. The system has a source-to-analyzer grating distance of 788.4 mm, which is compact enough for a commercial product. In a normal operation, it took less than ten seconds to acquire a set of phase stepping images. The acquired images had a maximum visibility of about 15%, which is relatively high compared with the visibilities of the other high-energy grating interferometric systems reported so far.

• Asian Journal of Business Environment
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• 제9권2호
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• pp.17-25
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• 2019

Purpose - This study uses the 'Galapagos Effect' theory proposed by Japanese researchers to investigate if there is a basis for applying the theory to South Korea, specifically in the High-Tech Service area. Research Design, Data, and Methodology - The underlying characteristics of Japanese business environment that led to the Galapagos Effect are identified, and then Korea is investigated to see if these characteristics are also evident. The case studies of three South Korean companies are explored to see if they can be considered as examples of the Galapagos Effect Results - The findings illustrate that some evidence for the existence of the Galapagos Effect does exist in Korean companies, but more research is required to systemize the phenomenon. Conclusions - The study concludes that proactive measures at a Government and business level should be implemented to mitigate the effects of the Galapagos Effect in Korea. The existence of evidence suggests that there may be grounds for more comprehensive studies in order to try and make a generalization. In addition, more study needs to be done to establish exactly which kinds of high-tech service companies are most likely to hit barriers due to the Galapagos Effect as it is not clear from the existing evidence.

• 수산해양기술연구
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• 제29권3호
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• pp.191-199
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• 1993

In order to analysis creep characteristics and elastic recovery of the high-tech fibers for fishing gear materials, creep and elasticity tests were carried out on netting twines made of nylon, kevlar 29 and techmilon respectively. After creep tests, the rupture surface of raw materials was observed by scanning electron microscope(SEM). The results obtained are as follows: 1. Netting twines were arranged in order of creep rupture time as follow: techmilon, kevlar 29, nylon. The creep progressive pace was the fastest in techmilon. 2. In order of the creep elongating, netting twines were arranged as follows: nylon, techmilon, kevlar 29. 3. The rupture time T sub(r) decreased almost linearly with the increase of applied load L on the log-log scaled graph. The empirical equations computed for kevlar 29 and techmilon are as follows: T sub(r kevlar 29)=1.9512$\times$1037L super(-15.773). T sub(r techmilon)=2.7146$\times$1016L super(-6.831). 4. It was observed by SEM that creep was progressed in all netting twines. The difference of rupture morphology was recognized clearly in tensile and creep tests. 5. In order of the elastic recovery, netting twines were arranged as follows: techmilon, kevlar 29, nylon.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.307-312
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• 1998

The paper first describes the atmospheric correction algorithm for the Ocean Color and Temperature Scanner (OCTS) visible band data used at Earth Observation Center (EOC) of National Space Development Agency of Japan (NASDA). It uses 10 candidate aerosol models including "Asian dust model" introduced in consideration of the unique feature of aerosols over the east Asian waters. Based on the observations at 670 and 865 nm bands where the reflectance of the water body can be discarded, the algorithm selects a pair of aerosol models that accounts best for the observed spectral reflectances to synthesize the aerosol reflectance in other bands. The paper also evaluates the performance of the algorithm by comparing the satellite estimates of water-leaving radiance and chlorophyll-a concentration with selected buoy-and ship-measured data. In comparison with the old CZCS-type atmospheric correction algorithm where the aerosol reflectance is as-sumed to be spectrally independent, the OCTS algorithm records factor 2-3 less error in estimating the normalized water-leaving radiances. In terms of chlorophyll-a concentration estimation, however, the accuracy stays vey similar compared to that of the CZCS-type algorithm. This is considered to be due to the nature of in-water algorithm which relies on spectral ratio of water-leaving radiances.