• Mycobiology
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• 제31권4호
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• pp.251-254
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• 2003

To select active bacterial strains to control plant diseases, 57 bacterial strains were isolated from the rhizosphere of the plants growing in various areas such as coast, middle and top of Halla Mountain in Jeju Island. Anti-fungal effect of isolated bactrial strains was tested in vitro by incubating in potato dextrose agar with isolates of four fungal plant pathogens Rhizoctonia solani, Fusarium oxysporum, Colletotrichum gloeosporioides and C. orbiculare, respectively. Thirty-four bacterial strains inhibited the hyphal growth of the plant pathogens, from which 17 strains inhibited one of the tested fungi, 10 strains two fungi, six strains three and a strain TRL2-3 inhibited all of the tested fungi. Some bacterial strains could inhibit weakly the hyphal growth of the plant pathogens, whereas some did very strongly with apparent inhibition zone between the plant pathogens and bacterial strains indicating the unfavorable condition for hyphal growth. Although there was no apparent inhibition zone, some bacterial strains showed a strong suppression of hyphal growth of plant pathogens. Especially, the inhibition by TRL2-3 was remarkably strong in all cases of the tested plant pathogens in this study that could be a possible candidate for biological control of various plant diseases.

• 한국군사과학기술학회지
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• 제6권2호
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• pp.73-82
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• 2003

For measurements and analysis of dielectric characteristics of planar slabs of microwave absorbing materials, I have applied a free-space method in the frequency range of 8~14 GHz. The measurement system for free-space method consists of transmit and receive antennas, mode transitions, precision coaxal cables, the network analyzer, and a computer Special Spot-focused horn lens antenna was used to eliminate diffraction effects. Diffraction effects at the edges of the sample are minimized by satisfying the condition for minimum transverse dimension of the plate and the beamwidth of the antennas at the focus. The time-domain gating feature of the network analyzer and the thru, reflect, and line(TRL) calibration technique were used to eliminate the effects of undesirable multiple reflections. The complex coefficients of reflection and transmission, $S_{11}$ and $S_{21}$, of planar samples were measured for standard materials such as Teflon, Rexolite$\textregistered$ 2200. The results were compared with existing measurement method. And I applied a free-space method for measurement to measure dielectric constants of some electromagnetic absorbing materials. Dielectric properties for the same samples were also measured with a 7mm coxial transmission line method for purposes of comparison with the free-space method.

• 신재생에너지
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• 제19권1호
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• pp.41-52
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• 2023

Various carbon upcycling technologies have been proposed and are under development to achieve Korea's carbon neutrality target. Many chemical reactions are under development through various chemical reaction pathways, and different technological maturity levels are shown for each country and company. In this situation, it is essential to establish investment decisions such as research funds and human resources allocation through technological and economic analysis for close commercialization technologies and basic technologies with low technology readiness levels (TRL). Therefore, in this study, the technology development priority for developing carbon upcycling items was selected according to the domestic Carbon Capture & Utilization (CCU) technology roadmap using the stakeholder selection tool released by EU CarbonNext. As a result of the analysis, the TRL level of Korea's major carbon upcycling technologies was analyzed to be lower than that of other carbon resource technologies, and it was considered desirable to invest in mineral carbonization technologies among various candidate technologies.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2002년도 추계기술심포지움논문집
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• pp.147-151
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• 2002

We fabricated and characterized a millimeter-wave ceramic package in a frequency range from 6 to 40㎓ using the LTCC(Low Temperature Cofired Ceramic) Technology and TRL(Thru-Reflect-Line) calibration method. From these measurement results, the fabricated feed-through structure achieved 0.5 dB, 14 dB of the insertion loss and the return loss at 30 GHz respectively. This ceramic package will be useful for MMIC(Monolithic Microwave Integrated Circuit) modules.

• 한국산학기술학회논문지
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• 제17권3호
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• pp.57-65
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• 2016

산학협력은 국가경쟁력 강화를 위해 필요한 정책이나 기업 수요가 지속적으로 감소하고 있어 산학협력 활동이 위축받고 있다. 특히 산학협력의 범위를 일부로 한정하여 판단함으로서 전문직업인 양성을 위해 노력하는 전문대학이 일반대학에 비하여 산학협력에 기여하는 바가 미흡하다는 인식이 있고 이것은 전문대학 산학협력 활성화를 저해하고 있다. 전문대학 산학협력을 활성화하기 위해서는 기업 수요를 정확히 파악하는 것이 무엇보다도 중요하다. 본 연구는 기업을 대상으로 설문조사를 실시하고 3D 프린팅과 전문대학 졸업생의 활동분야를 비교분석하여 3D 프린팅을 활용한 전문대학 산학협력 활성화 방안을 제안한다. 그리고 전문대학과 일반대학의 주요역할을 기술사업화 절차에 따라 기업 수요를 분석하여 기업과 전문대학 그리고 일반대학의 협력모델을 제안한다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 춘계학술대회
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• pp.88-88
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• 2020

Ginseng (Panax ginseng Meyer) is a very well-known traditional herbal medicine that has long been used to enhance the body's immunity. Because it is a type of ginseng, it is believed that wild simulated ginseng (WSG) also has immune-enhancing activity. However, study on the immune-enhancing activity of WSG is quite insufficient compared to ginseng. In this study, we evaluated immune-enhancing activity of WSG through macrophage activation to provide a scientific basis for the immune enhancing activity of WSG. WSG increased the production of immunomodulators such as NO, iNOS, COX-2, IL-1β, IL-6 and TNF-α and activated phagocytosis in mouse macrophages RAW264.7 cells. Inhibition of TLR2 and TLR4 reduced the production of immunomodulators induced by WSG. WSG activated MAPK, NF-κB and PI3K/AKT signaling pathways, and inhibition of such signaling activation blocked WSG-mediated production of immunomodulators. In addition, activation of MAPK, NF-κB and PI3K/AKT signaling pathways by WSG was reversed by TLR2 or TLR4 inhibition. Based on the results of this study, WSG is thought to activate macrophages through the production of immunomodulators and phagocytosis activation through TLR2/4-dependent MAPK, NF-κB and PI3K/AKT signaling pathways. Therefore, it is thought that WSG have the potential to be used as an agent for enhancing immunity.

• 전자통신동향분석
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• 제29권3호
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• pp.118-130
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• 2014

전문 서비스로봇인 국방 무인 로봇은 무기체계 개발 시, 소요군의 운용개념 미확정, 국내 로봇 기술수준(TRL) 및 기술성숙도 미흡 등으로 무인체계의 소요기획 및 전력화 소요 반영이 되지 않고 장기적인 획득 대안으로 생각하고 있으나, 미국의 미래 전투체계(Future Combat System)에서 보듯이 네트워크 중심전(NCW)으로의 전장 환경변화 등 무인전투체계의 통신 및 소프트웨어(복합체계 공통운용환경(SOSCOE: System of Systems Common Operating Environment))의 중요성은 더욱 커지고 있다. 국가적으로는 국방 무인 로봇을 시장확산분야로 인식하고 있으며, 그동안 해외 도입 위주의 국방 무인 로봇 시장에 대한 중요성이 부각되고 있어, 우리나라 창조경제 발전의 견인차 역할로 무인체계 시장의 선점 및 새로운 고용시장을 창출할 수 있는 기반으로 투자를 확대하고 있다. 따라서, 본 논고를 통하여 무인체계에 대한 체계개발 활성화 방안에 기여하기 위한 선제적인 방법으로 연구개발 방향을 설정하고, 기술개발 방향 및 획득 우선순위 등 개발전략을 수립하고 그 대안을 제시하고자 한다.

• 시스템엔지니어링워크숍
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• 통권4호
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• pp.123-134
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• 2004

This paper deals with the feasibility analysis and alternatives for infrared detector development. The purpose of this paper analyze development requirement and feasibility study in both technology and cost. We get raw input data for system engineering process from development and technical expert, and then analyze cost and technology for development feasibility, and alternative study. Infrared Detector is core component of Thermal Imaging System and developed by ADD from 2006 to 2008 year. Technical level is analyzed by TRL(Technical Readiness Level) and AOA(Analysis of Alternative) is done by development and production cost estimate. We use SEER-H tool for cost estimate, that is parametric cost estimate tool based on Knowledge Base. Also this paper presents risk analysis for project management because it is necessary to risk driver management during the infrared detector development. The result of IR Detector feasibility and alternative study will be used in technical and cost analysis. This study can help those who are related to the cost analysis and development feasibility of other weapons

• 자동차안전학회지
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• 제6권2호
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• pp.43-48
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• 2014

The flexible pedestrian legform impactor(Flex-PLI) consisting of a flexible femur and tibia will be tested for pedestrian protection by global technical regulation(GTR) within the next couple of years as a replacement for the existing transport research laboratory(TRL) legform impactor. In this study, a computer aided engineering(CAE) model was used to perform the effect analysis of each injury with regard to the changes in tolerance factors with the baseline results without tolerance. The tolerance factors were the height of impactor from ground reference line, initial velocity of impactor and rotation of impactor.

• Journal of electromagnetic engineering and science
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• 제2권2호
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• pp.59-64
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• 2002

In this paper, 10$\mu$ m-elevated MEMS CPWs on various substrates are presented. Effective dielectric constants of elevated CPW(ECPW) on polyimide-loaded silicon or alumina substrate are examined and characteristic impedances are also computed versus elevation height. Dispersive property of ECPW and its electromagnetic field distributions are studied through 3-D FDTD algorithm for optimum design. Attenuation of ECPW is measured with TRL calibration procedure and revealed about 3.2 43 lower than that of conventional CPW on the same low-resistivity silicon at 40 CHz. ECPW on polyimide-loaded silicon with overlapped configuration reveals 0.2 dB/mm. Especially, alumina substrate imposes better attenuation than silicon.