• Journal of the Korean Society for Precision Engineering
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• v.21 no.2
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• pp.52-59
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• 2004

In this paper, the automatic system generation algorithm based on the element combination algorithm discussed in the first part of this paper for designing an arbitrary type of the automatic transmissions is proposed. The powertrain design software using these algorithms is developed. This automotive powertrain design software with user-friendly graphic user interface has two main modules. The first module, the automatic power flow generation module, is already discussed in the previous paper. The second module dealing with the automatic system generation algorithm is discussed in this paper. The power-flow simulation software fur the arbitrary type of powertrain is then developed. The simulation and experimental results of the vehicle equipped with two planetary gear type automatic transmission are compared to validate the proposed algorithms and developed software. The simulation results demonstrate the good agreement with the experimental results.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.2
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• pp.60-66
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• 2004

Increased energy costs have placed demands for improved combustion efficiency, high equipment availability, low maintenance and safe operation. Simultaneously low NOx modification, installed due to stricter environmental legislations, require very careful combustion management. The flame diagnostics system has been developed specially to meet these requirements. We aimed at gaining the relationship between burner flame image and emissions such as NOx and unburned carbon in furnace by utilizing the image processing method. For the first step of development, its possibility test was undertaken with bench furnace. The test proceeded to the second step with pilot furnace, the system was observed to be effective for evaluating the combustion conditions.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.301-304
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• 2002

Powertrain simulation is important fur the analysis of a vehicle performance. Automotive powertrain has been considered as the unified system and should be remodeled, whenever a powertrain system is changed. In this study, a new method is proposed for the synthetic modeling for the automotive powertrain. Components are separated from the powertrain system and constructed the matrix through dynamic relationships. The dynamic equation of the total powertrain system can be driven from the combination of each component. In order to combine each component, the superposition method is modified for the powertrain composition.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.333-338
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• 1993

In this paper, we introduce an industrial three degree of freedom manipulator which loads/unloads various freight on an AGV(automated Guided Vehicle). We design and implement the industrial controller for the manipulator with P-I) gain variation method. Since this battery-powered manipulator is opten driven in an instufficient power condition, the gravity effects on the robot joints can be a significant problem. The objectives of this paper are twofold : the presentation of a PI)-controller which can compensate the gravity effects, and the design and implementation of an industrial three degree of freedom manipulator for loading/unloading.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.100-104
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• 2005

본 연구에서는 도시의 급격한 발달로 인해 왜곡된 물순환을 나타내고 있는 도림천 유역에 대해서 물순환 회복을 위한 대안 중 침투증진시설의 효과에 대한 모의를 수행하였다. 물순환 모의는 도시유역의 물순환 정량화를 목적으로 개발된 WEP(Water and Energy transfer Processes) 모형을 이용하였으며, 침투증진시설로는 침투트랜치와 투수성 포장재의 설치효과를 분석하였다. 물순환 회복효과는 도시개발 이전의 유출특성과의 비교를 통해 평가하였으며, 이를 위해 1975년의 토지이용도로 도시개발 이전의 물순환 모의를 수행하였다. 모의결과 도시화에 의해 불투수율이 과거보다 $18.7\%$ 증가한 것을 알 수 있었으며, 이로 인해 첨두시간은 감소하고, 첨두 및 총유출량은 증가한 것으로 나타났으며, 침투량과 기저유출량이 감소한 것을 확인할 수 있었다. 침투증진시설의 설치효과는 침투트랜치와 투수성 포장재의 개별적인 설치보다는 두 가지를 함께 적용했을 경우에 도시개발 이전의 유출특성에 근접하는 것을 알 수 있었다.

• Journal of the military operations research society of Korea
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• v.30 no.1
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• pp.107-134
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• 2004

Today's Internet is providing a single service which is so-called "best-effort service". Now, multimedia and real-time applications are not only demanding large bandwidth but also requiring high QoS. For this, MPLS and DiffServ technology can be adopted to support more scalability and QoS for data traffic engineering. The DISN(Defense Information Systems Network) supports CBR service for voice traffic and VBR service for data traffic which is best-effort service. We propose how to adopt MPLS and DiffServ technology to support traffic engineering and guarantee QoS in the DISN. A traffic analysis according to prioritized traffic classes is done using OPNET simulation tool for assuring QoS. The result shows that low priority packets are delayed a little bit, but high priority packets are transferred more efficiently than without traffic engineering.gineering.

• New & Renewable Energy
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• v.3 no.4
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• pp.90-97
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• 2007

Gasification has been regarded as a very important technology to decrease environmental pollution and to obtain higher efficiency. The coal gasification process converts carbon containing coal into a syngas, composed primarily of CO and $H_2$. And the coal syngas can be used as a source for power generation or chemical material production. This paper illustrates the opeartion characteristics and results of pilot-scale coal syngas production facilities. The entrained-bed pilot scale coal gasifier was operated normally in the temperature range of $1,300{\sim}1,400^{\circ}C,\;2{\sim}3kg/cm^2$ pressure. And Indonesian KPC coal produced syngas that has a composition of $46{\sim}54%\;CO,\;20{\sim}26%\;H_2,\;and\;5{\sim}8%\;CO_2$.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.46-48
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• 2003

정보화 사회로의 급속한 전환으로 인해 고품질 소프트웨어에 대한 관심과 요구가 증대되었다. 따라서 양질의 소프트웨어를 확보하여 시스템의 안정성과 신뢰성을 높이 위해서는 개발활동의 전 단계에서 품질 보증 활동 및 평가가 이루어져야 한다. 개발 초기에는 프로젝트의 특성과 품질요구사항을 철저히 파악하여 품질목표를 설정하고 개발단계에서는 품질목표의 충족여부를 면밀히 점검하여야 한다. 본 논문에서는 소프트웨어 품질 평가의 기준이 되는 ISO 9126을 기반으로 소프트웨어 개발 전 단계에대한 품질특성의 상관관계와 가중치를 설정하고, 정량화된 품질평가 모텔을 제안하여 소프트웨어 개발의 성공에 실질적으로 지원할 수 있는 평가기준 정립 및 표준화를 위한 기초로 활용할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.196-198
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• 2004

국내에서는 고도의 정보인프라 구축을 위한 광대역통합망(BcN) 추진에 대한 관심이 점점 높아져 가고 있다. 한편, 미래의 전쟁수행개념은 정보우위 확보를 위한 네트워크 중심의 전투(Network Centric Warfare)수행이며 이러한 전쟁수행패러다임 변화에 대응하기 위한 통합망 연구가 중요하나 아키텍처 모델 제시 등 D-BcN을 위한 연구실적은 미흡한 실정이다. 따라서 본 논문에서는 D-BcN에 대한 하나의 아키텍처를 모덱링 하고자 한다. 이를 위해 BcN 개념 및 구조, 외국군 사례, 현 국방 정보통신망 문제점 분석을 통해 국방아키텍처 프레임워크(MND-AF) 지침에 의한 개발방법을 적용, 최상위 운용 및 체계관점에서 하나의 아키텍처 모델링을 제시하였다. 그리고 상용 BcN과 비교하여 주요 차이점을 제시하였다. 이러한 D-BcN 아키텍처 모델링은 보다 구체적인 D-BcN 아키텍처 설정에 도움이 될 것으로 기대된다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.11
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• pp.1943-1949
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• 1997

In this paper, the analysis of the shift transient characteristics for the Ravigneaux type automatic transmission has been carried out using dynamic models of the automatic trnasmission. It is necessary to understand the overall system including multi-plate clutch, band brake, one way clutch, and planetary gears. The equations of motion are derived from the dynamic models of the automatic transmission. The GUI computer simulation program has been developed to analyze the shift transient characteristics of the vehicle equipped with the Ravigneaux type automatic transmission.