• Korean Journal of Construction Engineering and Management
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• v.19 no.1
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• pp.3-11
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• 2018

In order to find methods to encourage active private participation for efficient road maintenance, this study examined the status of the road improvement project and the development of the private capital utilization improvement project. Based on this, the study conducted a case study and a financial feasibility study that applied the new business method and selected the applicable business method. As a result, it is analyzed that the method of using Crowd Funding is more advantageous than the private scheme of the private capital utilization improvement project. This is because it will be highly effective in raising funds from users of highway users, especially users of improvement projects. In addition, it can also mean that the road users who suffer from inconvenience due to the construction can return the toll profit of road construction to the user.

• Journal of the Korean Society of Propulsion Engineers
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• v.26 no.6
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• pp.86-100
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• 2022

In this paper, the concept and characteristics of the nuclear propulsion system were introduced and the state of the art for the nuclear-powered space propulsion in abroad were summarized. Since uranium used in nuclear propulsion has a very high energy density per unit mass, it has exceptional specific impulse performance compared to the existing chemical propulsion method and can reduce the amount of fuel loaded, thereby having advantage for long-distance exploration. For this reason, advanced countries in space development are recently spurring to the research of nuclear propulsion technology, and it is judged that the development of a propulsion engine using nuclear power is absolutely necessary in order to gain an competitive edge on the space development.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.780-783
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• 2006

본 논문에서는 KT 서비스 단말을 위한 문자 입력 방식 표준화 전략에 대해 기술한다. KT 표준 문자 입력 방식은 문자 입력을 필요로 하는 KT 서비스 단말기에 탑재되어, 고객의 서비스 이용 편의성 증대와 사업 효율성 증대를 위한 통일된 문자 입력 인터페이스로 사용된다. 대표적인 30 개의 문자 입력 방식에 대해, 문자 입력 방식의 우수성, KT 사업 추진 기여도, 지적재산권 확보 여부 등의 3 가지 평가 기준을 적용하여, KT 사업에 가장 적합한 문자 입력 방식을 KT 표준 문자 입력 방식으로 선정한다. 선정된 표준 문자 입력 방식은 KT 서비스 단말의 특성 및 단말 제조업체와의 관계 등을 고려하여, KT 주도형 단말에 대해 우선 적용할 계획이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.693-696
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• 2002

이동전화시장은 제공되는 서비스와 거래주체 등에 따라 소매시장과 도매시장으로 분류된다. 특별히 도매시장에 해당되는 이동착신요금은 최종수요자에게 이동전화서비스를 제공하기 위한 사업자간 거래로서 원가에 근거하여 산정 되도록 규제되고 있다. 그리고 원가에 근거한 방식으로는 장기증분원가방식(TSLRIC: total service long run incremental costs)에 따른 요금산정방식이 최근 통신선진국을 비롯하여 도입 추진 중에 있다. 한편 호주에서는 이러한 추세와 다르게 최근 이동착신요금을 장기증분원가방식이 아닌 소매가격벤치마킹 (retail benchmarking)방식을 적용토록 하였다. 이러한 이유는 호주의 이동망 시장이 다른 통신선진국과 달리 경쟁의 정도나 상황이 다름에 기인한다. 따라서 본 고에서는 이동망 착신요금산정방식으로 고려될 수 있는 적절한 방식들에 대한 검토와 호주의 이동망시장상황과 이에 적합한 요금산정방식을 검토 분석하여 국내 이동망 시장에 주는 시사점을 도출한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.04a
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• pp.245-248
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• 2011

A multi pulse rocket motor(MPRM) has several advantages compared to the single one. The range and the terminal velocity of the guided missile can be remarkably increased by the application of the pulse separation device(PSD) to the solid rocket motor which resulted in appropriate thrust distribution. In this study, the full scale heavy type dual pulse rocket motor with the bulkhead type PSD was designed, manufactured, and fire-tested. The bursting time and pressure of PSD were analyzed by the pressure, thrust and vibration results of static fire tests. As a result, the design requirement was verified that bursting pressure is lower than 30% of 2nd pulse operating pressure.

• The Optical Journal
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• s.97
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• pp.81-84
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• 2005

흑백, 컬러 프린터(잉크젯 포함), 복합기들의 토너카트리지, 잉크카트리지에 대한 공정하고 객관적인 프린트 매수 측정을 위한 규격제정을 통해 소비자에게 정확한 정보를 제공하고자 지난해 한국광학기기협회에서는 기술표준원에서 ISO 관련 규격을 토대로 KS규격제정 용역을 받아 추진한 바 있다. 이번호부터는 KS제정고시된 규격내용을 4회에 걸쳐 연재하고자 하며 금번에는 첫 번째 시간으로‘전자사진방식의 컬러프린터와 프린터를 포함하는 복합기에서의 토너카트리지 수명 결정방식’에 대해 소개하고자 한다.

• Journal of the Korean Society of Propulsion Engineers
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• v.10 no.1
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• pp.64-71
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• 2006

For SUAV is required to have the capacity of VTOL and fast forward flight, the SUAV development program has decided to adopt the tiltrotor mechanism which includes helicopter and turboprop mechanisms. From the engine point of view, the key engine parameters such as engine operating mechanism, engine control scheme, the dynamics characteristic of power train, engine intake/exhaust concept, and engine installation requirements should fulfill the requirements of the two different mechanisms, helicopter and turboprop. And for the maximum efficiency of the rotor, rotational speed for the two modes are 20% different, the power train shall find a way to make it so. Meeting these specific requirements for the tiltrotor mechanism, this research begins with a conventional OTS(off-the-shelf) turboshaft engine survey and minimizes engine modification to develop an economical propulsion system. The engine technical review has been performed on the basis of those requirements and capabilities.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.10
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• pp.858-869
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• 2014

Most of the aerospace propulsion is based on the Brayton cycle, in which the combustion is held through the constant pressure process, but further improvement of performance by increasing compression ratio is challenged by mechanical limits. Detonation propulsions, regarded promising for high-speed propulsion for a lase decade, is more rigorously studied in these days as a game-changer for the improvement of thermodynamic efficiency of propulsion and power generation systems. Since, the additional compression by the strong shock of the detonation wave is considered increasing thermodynamics efficiency that is hardly achievable by the conventional compression systems. Present paper will give an introduction the latest technical trends on the Pulse Detonation Engines(PDEs) and the activities on the Pressure Gain Combustion (PGC) based on Constant Volume Combustion (CVC).

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.10 no.5
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• pp.63-71
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• 2015

Lean six sigma has to be utilized considering irrational system or defects based on features of organization beforehand. Otherwise, it won't improve anything but burden another heavy responsibilities to the people in charge. Therefore, a survey was conducted in addition to a literature review and a case study about lean six sigma to verify effective deployment method for lean 6sigma tools. The survey was conducted across for 96 interviewees who have MBB or BB was selected from 15 companies which have been running six sigma projects over 10 years and SPSS 16.0 was used for verifying reliability and validity of the research. In conclusion, some issues occurred in the process of six sigma projects were identified and effective deployment method of lean six sigma tools by integrating lean manufacturing into 6sigma were suggested based on those issues.

• The Transactions of the Korean Institute of Power Electronics
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• v.16 no.5
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• pp.494-502
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• 2011

Bimodal tram is designed to run on a dedicated path in automatic mode using a magnetic track system in order to realize a combination of the accessibility of a bus and the constant regularity of a railroad. This paper presents design and test results of the series hybrid propulsion system of the bimodal tram on both test track and public road, which uses CNG (Compressed Natural Gas) engine and Lithium polymer battery pack. This paper describes the real-time data measuring equipment for the series hybrid propulsion system of the bimodal tram. Using this measurement equipment, the performance of the prototype vehicle's driving on test track and public road was verified and the fuel consumption and the efficiency of CNG engine have been investigated.