• 지식경영연구
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• 제20권2호
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• pp.197-216
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• 2019

The Korean government has been focusing on supporting technology startups to solve social and economic problems such as low growth, declining economic growth rate, rising youth unemployment rate and lack of new growth engine. Although the failure rate of young technology startups is very high, relevant researches are still scant. On the basis of previous researches, this study has identified four growth factors of technology startups: characteristics of entrepreneurs, technical superiority and originality of business items, focused marketing strategy, and follow-up government support projects. Five young technology startup cases were selected and analyzed in the cosmetics industry which were supported by the Six-month Challenge Platform project of Chungbuk Creation Economic Innovation Center. The main findings of the case study were as follows: First, product development through inhouse R&D rather than external contracted R&D was beneficial to acquiring follow-up government support projects and external investment. Second, choosing a small niche market and concentrating marketing efforts on the target market had a positive effect on firm performance. And, third, relevance of entrepreneurs' college major and technological originality of business items were confirmed to influence firm performance positively in the early stage. The results are expected to help young technology startups survive successfully and establish a foothold for growth in their early stage.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2005년도 제24회 춘계학술대회논문집
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• pp.23-26
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• 2005

LOx와 Kerosene을 연료로 사용하는 LRE(Liquid Rocket Engine) Block에서 지상연소시험을 수행할 경우에 발생하는 위험도를 감소시키는 방법을 연구하였다. 추진제누출로 이어지는 위험한 상황에 대한 원인분석도와 추진제 유출시 사고로 이어지는 발전 양상 및 발전 프로세스, 사고시 손실을 줄이기 위한 기술적인 해결방법을 제시함으로써 기존의 확률적인 통계 값을 바탕으로 하는 것과는 또 다른 방법으로써 위험을 감소하기 위한 대안으로 사용하고자 한다.

• 동력기계공학회지
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• 제21권3호
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• pp.85-92
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• 2017

Global air traffic is forecast to grow at an average annual rate of around 5% in the next 20 years. The continuous growth of air traffic and raised environmental awareness put increasing pressure on aero engine manufacturers to reduce fuel burn and emissions. NEWAC are a new integrated program of the European Union with focus on innovative core engine concepts to achieve this problem. In this paper, Within NEWAC, active core engine configurations will be investigated. the investigation is focused on the optimal design of the CAC heat exchanger for active core. For optimal design of he CAC heat exchanger, the HTFS of basic design of heat exchanger are analyzed so as to proceed an optimization routines based on Response Surface Method(RSM) and Design of Experiment(DOE). As a result, CAC heat exchanger optimized by 1.0314 lb/s mass flow rate and 3.9058 mm TP of tube layout and 206.8181 mm height of heat exchanger and 918 tube number for heat transfer and pressure drop. We confirm the design optimization using RSM and DOE is useful on complex structure of heat exchanger.

• 대한기계학회논문집B
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• 제23권2호
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• pp.288-298
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• 1999

In spark ignited engines, the electrical spark not only sets the time for the onset of combustion but also is able to greatly influence the character of the initial flame growth and the subsequent combustion, and thereby can influence engine performance. The relative importance of the ignition energy is particularly high under lean or high residual gas or exhaust gas recirculation (EGR). In this study, a modeling of flame Initiation and its development is proposed. Submodels consist in representing of cylinder pressure and temperature, heat transfer to cylinder wall, and flame kernel heat transfer to ambient air and to spark plug electrodes. The breakdown process and the subsequent electrical power input initially control the kernel growth while intermediate growth is mainly dominated by diffusion or conduction. Then, the flame propagates by the chemical energy, and laminar and turbulent flame velocity.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2019년도 춘계학술대회
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• pp.228-229
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• 2019

자율운항선박은 전통적인 제조중심, 단순 화물 운송의 조선해운산업에서 패러다임을 전환시키는 게임 체인저로 부상하고 있다. 이에 정부에서도 자율운항선박 산업을 혁신성장동력으로 육성하고, 시장 경쟁력 확보에 필요한 핵심기술을 개발하기 위한 구체적인 추진계획을 소개한다.

• 한국자동차공학회논문집
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• 제10권3호
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• pp.36-43
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• 2002

The characteristics of spray has much effect on performance and emissions for automobile, diesel engine, gas turbine and combustion engines. So spray behavior after impinging the wall is very important for prediction the engine performance. This studies examined about impingement spray considering ambient density(18,24,30kg/ms), temperature(293,473K), impingement angle(0,30,45°). The images of impingement spray were obtained by the high speed video camera. After that we analyzed impingement spray characteristics to use this images. In this experiment, we found that 1) The spray width is reduced by increasing the ambient gas density and temperature,2) The growth of downstream is increased by increasing the impingement angle.

• 한국분무공학회지
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• 제2권4호
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• pp.1-6
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• 1997

In the case of analyzing the combustion phenomena in a small high speed DI diesel engine, one demands the experimental results of the impinging spray on the wall as a basic characteristics. In the experiments presented here, diesel fuel oil was injected into a high pressure chamber in which compressed air at room temperature was charged. The single spray was impinged on a flat wall. The growth of the spray was photographed with transmitted light or scattered light. The effect of the spray axis angle to the wall on the impinging spray was revealed. Finally, the experimental results was presented, that is, the radius and height of the impinging spray was influenced by above mentioned variable.

• 소성∙가공
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• 제8권3호
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• pp.265-265
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• 1999

The development of mechanical alloying (MA)-oxide dispersion strengthened (ODS) heat-resistant ferritic alloys of Fe-12%Cr with W, Ti and Y₂O₃additions were carried out. Fe-12%Cr alloys with 3%W, 0.4%Ti and 0.25% Y₂O₃additions showed a much finer and more uniform dispersion of oxide particles among the alloy system studied. Nano-sized oxides dispersed in the alloys suppress the grain growth during annealing at a high temperature and resulted in the remarkable improvement of creep strength. The oxide phase was identified as a complex oxide type of Y-Ti-O.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 박판성형기술의 진보
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• pp.99-118
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• 1994

In recent years reduction in noise and vibration in automobile has been strongly required not only from the standpoint of environmental regulations but also for raising the commercial value and ride comfort. Vibration damping steel sheets, which are composites made by sandwitching a visco-elastic resin layer between two steel sheets, have been developed as effective noise-abating materials and have found a growth of use in automobile industries. Vibration damping steel sheets for commercial use must be excellent in vibration damping property, press formability and spot weldability, but are inferior to ordinary steel sheets. In this study, the mechanical properties of vibration damping steel are evaluated, and press formability is analysed on the basis of those properties and shear bonding strength. The development of engine oil pan using damping steel sheets are also reported, focusing on serious problems in oil pan drawing.

• 한국방사선학회논문지
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• 제9권7호
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• pp.495-500
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• 2015

의료민영화는 의료서비스의 질, 의료비의 억제 그리고 소득재분배 및 위험분산 등에 매우 중대한 영향을 미치게 될 것이다. 본 연구는 의료민영화에 대한 본질을 이해하지 못한 채 너무 많은 주장들이 난무한 상황을 개선하고자 실시되었다. 본 연구에서는 현재 논란이 되는 의료민영화에 대한 의미를 파악하고, 그에 따른 주장들을 다루고 있다. 의료민영화 정책에 대한 찬성 및 반대의 주장을 동시에 살펴봄으로서 객관적인 관점수립에 도움을 주고자 한다. 보건의료가 자본주의적 시장접근을 통하여 다각화 되고 산업의 일환으로 전환되어 신성장 동력으로 바라보아지는 과정이다. 그러나 보건의료서비스는 사람의 생명을 다루는 실천적 행위이기 때문에 보편적인 방법으로의 접근 및 성장에 제약이 따른다. 더불어 정부의 이익 또는 의료기관의 이익만을 위한 서비스에 해당하지 않는다. 올바른 의료민영화 정책의 수립을 통하여 공공서비스로 자리 잡은 우리나라 의료시스템의 변화방향을 제시하고 국민의 의료비 부담을 증가하지 않는 정책적 논의의 필요성을 제시한다.