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RISS 인기검색어
- 검색키워드
- 저자 : 조성철(Seongcheol Cho) (검색결과 7 건)
- 무료
- 기관 내 무료
- 유료
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조성철(Seongcheol Cho),모동헌(Dongheon Mo),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objectives of this study was to examine experimentally the microexplosion phenomena of single droplet W/O(water-in-oil) type emulsified fuel and to measure the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition.<br/> The larger quantity of adding water makes microexplosion phenomenon with higher intensity of sound level because larger water droplet has better coalescence for emulsified fuel. The small quantity of adding water makes puffing with lower sound level intensity. In latter period of extinction, large size droplet of the emulsified fuel breaks down rapidly to small size droplet, and microexplosion phenomenon occurs with multi step combustion.<br/>
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유화단일액적의 특성에 관한 실험연구 (2) - 액적직경 변화에 관하여-
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jeongin Ryu) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objectives of this study was to examine experimentally the variation droplet diameter of single droplet W/O type emulsified fuel. We measured the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition.<br/> Larger initial droplet diameter makes combustion rate constant(Cb) higher because the water droplet diameter of emulsified fuel increases by coalescence. It proves that the larger diameter fuel droplet has shorter time from ignition to extinction.<br/> In latter period of extinction, large size droplet of the emulsified fuel breaks down rapidly to small size droplet, and Microexplosion phenomenon occurs with multi step combustion. The combustion time is reduced as equivalence diameter of the emulsified fuel droplet decreases. This phenomenon occurs substantially with increase of adding water.<br/>
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조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The capacitance sensor design and emulsified fuel manufacturing verify characteristics of emulsified fuel, so it concluded the following conclusions.<br/> The first 24 hours after emulsified fuel manufacturing reveals separation ratio of 1.5%,maintains stable status, and verifies the stability of emulsified fuel.<br/> Adding more water increases the separation ratio rapidly, and adding more surfactant displays stable emulsification using by microscope. 10% added water displays 1㎛ of water droplet diameter distributed on oil droplet, and 30% water does 2㎛, In 6 hours after adding water, I % surfactant mixture makes water diameter 4 to 5 times bigger, and 2% does 2 times, and 3% does 2 times.<br/> In general, adding water makes the density of water diameter bigger, and adding surfactant mixture makes the size of water diameter smaller.<br/> In conclusion, the size of W/O type emulsified fuel water diameter is directly related to the volume of surfactant, and density of water diameter changes the distribution according to water content.
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W/O형 유황연료의 안정성 측정을 위한 정전용량 센서개발
조성철(Seongcheol Cho),모동헌(Dongheon Mo),윤면근(Myunkeun Yoon),류정인(Jungin Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
We designed capacitance sensor for measuring capactance of W/O type emulsified fuel. Capacitance sensor consists of two conductors isolated by an insulator. The characteristics nature of a capacitance sensor is its ability to accept and store an electric charge. From using this concept, we carried out With manufacturing of capacitance sensor, the test results for validity of sensor and stability of 6 emulsified fuel conclude the followings.<br/> The result of capacitance measurement for 6 test fuels indicates design error range is within 4% max, so this fact proves the validity of capacitance sensor.<br/> Capacitance value of 6 emulsified fuel, with the aid of capacitance sensor, increases as water volume increases, but it decreases as surfactant increases when water is given equally.<br/> As a result, cylindrical type capacitance sensor proves validity of sensor and emulsified fuel which produce seperation ratio proves the stability of capacitance value.
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조성철 ( Cho¸ Seong Cheol ) 한국복음주의선교신학회 2021 복음과 선교 Vol.55 No.-
로잔 운동의 전개는 선교의 개념을 전통적인 복음 전도에서 삶의 모든 영역을 포괄하는 총체적 선교로 확대하였고, 선교 현장에 서는 비즈니스 선교 활성화의 배경이 되었다. 경영 관리적 관점에서 이러한 변화는 선교 서비스의 공급과 수요 모든 면에서 다양한 변화가 일어나서 선교전략의 기본적인 의사결정인 선교사 배치의 복잡성을 증가시킨 것이다. 이러한 복잡성의 증가로 인해 전통적 인 개별 선교사나 개교회 중심의 선교관리보다는 다수의 선교사와 선교지를 통합적으로 관리하는 통합기구의 역할이 강조된다. 그러나 다변화하며 증가하는 다수의 선교사를 다수의 선교지에 최적으로 배치하는 안을 찾는 일은 체계적인 방법론의 도움 없이는 현실 적으로 불가능하다. 이러한 상황을 배경으로 이 논문에서는 선교사 배치 모형(MAP, Missionary Assignment Planning)이라는 의사 결정 모형을 개발하여 다수의 선교사를 다수의 선교지에 최적으로 배치하는 방법을 제안한다. 제안된 의사결정 모형은 현대 경영 과학의 최적화 개념을 활용하여 개발되었다. 개발된 모형의 활용을 보이기 위해 선교사 5명이 2개의 선교지에 배치되는 문제와 10 명의 선교사가 4개의 선교지에 배치되는 가상적인 상황을 실험하였다. 이 실험을 위해서는 오늘날 PC 사용자들이 쉽게 사용할 수 있는 마이크로소프트 엑셀의 ‘해 찾기(Solver)’를 사용하였다. 제안된 기본 모형에 선교사 배치를 위한 예외적인 정책이나 세부 상황을 쉽게 반영하는 모형의 변형 가능성도 예시하였다. 또한 제안된 의사결정 모형은 이 논문에서 다룬 선교사 배치를 포함하여 더 넓게 포괄적인 선교자원 배치를 위해서도 확대할 수 있다는 가능성을 부가하였다. The evolution of the Lausanne Movement has enlarged the concepts of Christian mission from traditional evangelism to all aspects of human life. This broadened view has triggered the so-called BAM (Business as Mission) movement, which also embraces the applications of the professional management attitude and knowledge to mission activities. Various new emerging challenges of Christian missions have constantly increased the strategic complexity of assigning missionaries to mission fields beyond the ability of conventional mission management approaches. As an attempt to overcome this increasing complexity, this study develops a decision-making model for assigning missionary applicants to mission fields to maximize mission performance. The management science model, developed and defined as MAP (Mission Assignment Planning) in this study, can efficiently compare all the possible assignments of the missionaries to their mission fields and provide an optimal assignment for maximizing the overall expected mission performance. The implementation of MAP will not require any professional understanding of the mathematical details involved in the model but simply a basic understanding of using the spreadsheet software familiar to PC users these days. This study has illustrated how MAP works in practice by testing two hypothetical examples of assigning 5 missionaries to 2 mission fields, and 10 to 4, respectively. The Microsoft Excel Solver was used to test the examples. A few easy modifications for MAP to reflect exceptional minor considerations are added. A possible extended application is also added for MAP to assign all the mission resources including the human resources, especially as new virtual mission resources are growing fast due to the recent rapid development of information and communication technology.
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