• Information and Communications Magazine
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• v.30 no.9
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• pp.13-18
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• 2013

본 고에서는 n-Screen을 이용한 클라우드 기반 서비스들이 활용하는 대표적인 비즈니스 모델의 패턴을 살펴보고, 통신/방송 사업자, 단말 사업자, 서비스 사업자 및 OS 사업자별로 어떤 부분을 특화하여 비즈니스모델을 구성하고 있는지를 분석하여 정리하였다. 본 연구는 그 동안 n-Screen에 대한 기술적 측면과 서비스 측면에 대한 논의는 많이 있어왔지만 본격적으로 이와 관련된 비즈니스모델 측면의 검토를 했다는 것에 가치가 존재한다. 본 연구를 위해 비즈니스모델 젠1)에 포함된 툴킷 중 하나인 4by4 비즈니스 모델 매트릭스를 활용하였다. 이를 통해 n-Screen을 이용한 클라우드 서비스들이 주로 상품 측면에서는 번들링, 교차보조금 방식을 채택하고 있고, 채널 측면에서는 채널통합과 채널분화, 수익모델 측면에서는 프리미엄과 구독을 주로 활용함을 알 수 있었다. 이는 각 사업자별로 조금씩 다르게 특화되어 활용되고 있는데 이러한 차이를 유발하는 가장 큰 요인은 각 사업자들의 근거하고 있는 주요 수익원과 핵심역량의 차이에 기인한다. 결론적으로 n-Screen을 이용한 클라우드 서비스를 제공하려는 기업들은 먼저 비즈니스 모델을 이해하고 자사의 고유역량을 극대화하여 수익원을 강화하고, 부가 수익을 창출하는 방향으로 기본전략을 잡아야 할 것으로 보인다. 본 연구를 통해 기존에 n-Screen을 사업에 활용하던 기업이나 신규로 n-Screen 사업을 시작하려고 하는 기업에게 비즈니스모델 측면에서의 인사이트를 제공하고 이를 기반으로 사업을 기획하는데 활용할 수 있을 것으로 기대한다.

• The Journal of Korean Physical Therapy
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• v.18 no.6
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• pp.23-32
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• 2006

Purpose: The purpose of this study is to suggest new strategies available for the physical therapy curriculum development. Method: The curriculum of 4 Universities in 4 countries; America, Australia, Canada and Korea was compared to suggest new curriculum. Results: Overall, curriculum in Korea emphasized skill and technique areas and didn't showed many subjects to take foundation of subject for understanding principles. The experience in clinic is not enough to satisfy international recommendation. Conclusion: We suggest that a new curriculum should be based on the three part which are foundation, essential and selection subject, and extended clinical experience to essentially need to be physical therapy in the world-standard.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.4
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• pp.111-117
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• 2004

An analytical study was carried out to evaluate the regenerative cooling characteristics in the liquid rocket engine of a 10tf-thrust level using kerosene as a fuel. As a supplementary cooling method, a radiative cooling was applied to the nozzle extension. It was found out from this work that the cooling system with the regenerative and radiation cooling only is not adaptable for the liquid rocket engine of a 10tf-thrust level using kerosene as a fuel for the $2^{nd}$ stage of the space launch vehicle, with the viewpoint of the thermal and thermo-structural instability and the excessive pressure drop in the cooling channel.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2002.10a
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• pp.18-18
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• 2002

A project where the TPUs(Turbo Pump Units) for 10tf-thrust oxygen/methane LRE (Liquid Rocket Engine) are under development is being implemented to include an experimental combustion chamber developed. In the process of it, we introduced the power-balanced engine cycles in order to substantiate concepts of the engine using the combinations of the propellants. Accordingly, the main engine parameters of nominal operating mode are resulted from the 1-Dcalculations and it is found that the regulators are needed for controlling the expected pressure levels in the characteristics of propellant mixture ratio and thrust supposing the regulator is set to analogue-typed one which is easy to develop.The technical requirements like the nominal flow rate, its deviations expected and the pressure difference In need helped the several main characteristics of regulators to be determine in this stage. Here, a dozen of deviation values in the main parameters related to engineoperation are taken into independent consideration and accepted to the results for additional regimes of the regulators.Finally, we can determine the scheme and the primary dimensions along with the calculation design of the spring acceptable for general configuration which can definitely forwarded to the autonomous tests of the aggregates, The obtained data in further will be used for successive refinement of operating mode of the engine.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.554-557
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• 2011

One of the issues that occurs in development of a combustor using Metal Powder as a fuel is an alumina slag processing. A water film formed inside the combustor is expected to be able to solve this issue. The experiments about the formation of a water film were carried out as a preliminary study. As the tangential velocity of water jet is increasing, the angle derivation from horizontal is decreasing for the test model. Results of the experiments showed that the thin water film on the inner surface appeared at the velocity of 10~15 m/s.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.299-302
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• 2011

In the supersonic jet of a solid rocket motor, various noise is investigated. The purpose of this study is to attain and evaluating a design and manufacturing technique of the SRM noise reduction. In this study, the water is injected into the supersonic jet of the SRM to reduce the noise. Furthermore, the diffuser and stack are installed to suppress the SRM noise. Through the SRM ground tests, the noise is reduced approximately 20dBA with application of the diffuser/stack with water injection.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.404-407
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• 2011

The fluidic thrust vector control using co-flowing coanda effect of secondary jet at the nozzle exit is a new concept for efficient thrust vectoring of supersonic jet exhausts. Flow visualization of the flow fields in previous studies have shown some pros and cons of the technique, however, most of the observations were somewhat limited as qualitative data. The present study was designed to evaluate the quantitative performance-characteristics of the thrust-vectoring technique utilizing coanda effects of the secondary jet. Details of design of the test device and calibration/data reduction procedure are provided.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2003.10a
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• pp.83-88
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• 2003

An analytical study was carried out to evaluate the regenerative cooling characteristics in the liquid rocket engine of a 10tf-thrust level using kerosene as a fuel. As a supplementary cooling method, a radiative cooling was applied to the nozzle extension. It was found out from this work that the cooling system with the regenerative and radiation cooling only is not adaptable as a cooling method for the liquid rocket engine of a 10tf-thrust level using kerosene as a fuel for the 2nd stage of the space launch vehicle. So, additional cooling method, curtain cooling was introduced and analyzed. Curtain cooling was very effective to reduce the thermal and thermo-structural instability.

• Journal of ILASS-Korea
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• v.11 no.4
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• pp.220-227
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• 2006

Experimental studies has been conducted to investigate the effect of orifice diameter ratio on the mixing characteristics of the split element of doublet and triplet elements. The spray characteristics of non-reacting immiscible liquids have been investigated using a patternator. The local volume fraction is measured by use of mean value of each component. This volume measurement represents the mixing characteristics of the liquid, which affect the overall combustion efficiency. The ratio of the orifice diameter, ranging from 1 to 1.5, and that of the jet-momentum, ranging from 0.5 to 6.0, we used. The jet impinging behavior with use of various ratios exhibits substantially different mixing characteristics. Mixing efficiency is maximized when the jet-momentum ratio is increased; this behavior is particularly prominent when the orifice diameter ratio is greater than unity. The split of the triplet element yields better mixing characteristics and is more effective than that of the doublet element in regard to achieving high combustion efficiency. The optimum mixing factor for the triplet element is found to be 0.75, according to our measurement.

• The Korean Journal of Community Living Science
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• v.23 no.4
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• pp.441-446
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• 2012

The aim of this study was to evaluate the effect of application of the contents of Korean Information Center of Agricultura Safety and Health (KICASH) with 80 subjects(male: 60, female: 20) from different provinces nationwide in 2011. Subjects were classified according to their sex and familiarity of computer and then categorized into 3 groups with poor, medium and good by self-evaluation. The test for the effectiveness and satisfaction about KICASH was conducted with likert scale from very bad (1point) to very good (5point). Subjects generally tended to give 4 points to contents. And they gave support to KICASH in that they showed about 4 point with intention of application of KICASH for safety and health irrespective of familiarity of computer. However, as they received the information passively, it will be needed to develop more interesting and various contents which they could get more helpful information for their health and safety actively using two-way information communication system in future. Therefore the study can helps improve farmer's health and safety through developing advanced health and safety information system.