• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.05a
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• pp.36-40
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• 2006

An analysis is made of flow and rocket motion during a supersonic separation stage of air-launching rocket(ALR) from the mother plane. Three-dimensional compressible Navier-Stokes equations is numerically solved to analyze the steady/unsteady flow field around the rocket which is being separated from the mother plane configuration(F-4E Phantom). The simulation results clearly demonstrate the effect of shock-expansion wave interaction between the rocket and the mother plane. To predict the behavior of the ALR according to the change of the C.G., three cases of numerical analysis are performed. As a result, a design-guideline of supersonic air-launching rocket for the safe separation is proposed.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.4
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• pp.17-26
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• 2005

Numerical investigation has been made on the aerodynamic characteristics of supersonic air-launching rocket, as a new concept launching mechanism. Parametric study on the variations of launching velocity, incident angle and mounting location of the rocket has been performed using three dimensional Euler equations. Influential factors at separating stage of the rocket were extracted through comprehensive analyses, and, the response surface models were constructed for those factors. From the study, the aerodynamic behavior of the air-launching rocket at supersonic speed and useful guidelines for the optimal mounting location of the rocket have been obtained.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.35 no.6
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• pp.474-482
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• 2007

An analysis is made for flow and rocket motion during a supersonic separation stage of an air-launching rocket(ALR) from the mother plane. Three-dimensional compressible Navier-Stokes equations are numerically solved to analyze the steady/unsteady flow fields around the rocket which is being separated from the mother plane configuration(F-4E Phantom). Simulation results clearly demonstrate the effect of shock-expansion wave interaction around both of the rocket and the mother plane. To predict the behavior of the ALR by the change of the center-of-gravity, three cases of numerical analysis are performed. As a result, a design-guideline of supersonic air-launching rockets for safe separation is proposed.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.8
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• pp.18-25
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• 2005

This paper describes a supersonic separation of air-launching rocket from the mother plane. Three dimensional Euler equations were numerically solved to analyze steady/unsteady state fluid flows. The results of simulation clearly demonstrate effect of shock-expansion wave interaction between the rocket and the mother plane. Moreover, important influential factors at separating stage of the rocket were extracted with a comprehensive analysis. Finally, from the consideration of supersonic-separation, a guideline to safety-separation is given to the design of supersonic air-launching rocket.

• 한국전산유체공학회:학술대회논문집
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• 2005.10a
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• pp.255-259
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• 2005

An analysis is made of flow and rocket motion during a supersonic separation stage of air-launching rocket from the mother plane. Three-dimensional Euler and Navier-Stokes equations are numerically solved to analyze the steady/unsteady flow field around the rocket which is being separated from two cases of mother plane configuration: one is an idealized ogive-cylinder body and the other is a real F-4E Phantom. The simulation results clearly demonstrate the effect of shock-expansion wave interaction between the rocket and the mother plane. As a result, a design-guideline of supersonic air-launching rocket for the safe separation is proposed.

• 유체기계공업학회:학술대회논문집
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• 2006.08a
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• pp.423-426
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• 2006

An analysis is made of flow and rocket motion during a supersonic separation stage of air-launching rocket(ALR) from the mother plane. Three-dimensional compressible Navier-Stokes equations is numerically solved to analyze the steady/unsteady flow field around the rocket which is being separated from the mother plane configuration(F-4E Phantom). The simulation results clearly demonstrate the effect of shock-expansion wave interaction between the rocket and the mother plane. To predict the behavior of the ALR according to the change of the C.G., three cases of numerical analysis are performed. As a result, a design-guideline of supersonic air-launching rocket for the safe separation is proposed.

• 한국전산유체공학회:학술대회논문집
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• 2004.10a
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• pp.155-160
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• 2004

This paper describes a supersonic separation of air-launching rocket from the mother plane. Three dimensional Euler equations were numerically solved to analyze steady/unsteady state fluid flows. To solve the Euler equations, named CFD-FASTRAN that is commercial computation code. The results of simulation clearly demonstrate effect of shock-expansion wave interaction between the rocket and the mother plane. Moreover, important influential factors at separating stage of the rocket were extracted with a comprehensive analysis. Finally, from the consideration of supersonic-separation, a guideline to safety-separation is given to the design of supersonic air-launching rocket.

• 한국항공운항학회:학술대회논문집
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• 2004.11a
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• pp.182-187
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• 2004

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.323-324
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• 2008

전력계통 운영업무를 담당하고 있는 전력거래소는 계통운영방안 수립시 상정고장을 대비한 과도한 과부하 방지 또는 고장용량 초과 해소, 계통안정도 향상방법으로 변전소 모선분리 또는 승전선로 개방, 고장파급방지시스템 등을 적응하긴 있으며, 특히 인천지역에는 많은 발전기가 집중되어 있기 때문에 차단기 고장전류 해소를 위하여 345kV 인천T/P 등 여러 변전소를 모선 분리하여 운영하고 있다. 본 논문에서는 인천화력T/L이 자연재해로 인한 철탑이 도피되어 인천화력#1,2T/L 2회선 정지 및, 1회선 가복구 후 인천화력T/L회선으로 인천지역 및 경인지역 전력계통을 안정적으로 운영하기 위한 방안을 수립하여 계통운영업무 종사자에게 계통운영의 중요성을 보여주고자 한다.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.298-300
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• 2005

본 논문은 Part 2로서 배전계통을 위한 분산형 조류계산의 알고리즘을 제안하고, 결합 조류계산을 수행하기 위하여 경계상의 정보를 이용하고 송전과 배전계통에서 조류계산의 수렴 이후에 교환하는 알고리즘이다. 이는 각각의 조류계산 해법들이 송전과 배전계통에 사용될 수 있기 때문이다. 송전과 배전계통의 조류계산은 네트웍의 토폴로지와 파라메터 값들에서 큰 차이가 있기 때문에 분리하여 수행하여야 한다. 그러나, 두 계통이 물리적으로 연계되어 있거나 정확한 조류계산 해를 동시에 풀 수 있기 때문에 두 계통의 경계모선들에서 전력 오차를 계산하는 데 있어 약간의 오차가 있을 수 있다. 송전과 배전 계통의 경계 모선에서 전력 조류는 송전계통의 조류 계산에 대하여 부하로서 나타낼 수 가 있다. 다중 조류 기법들이 상호 존재하므로 이를 분산처리에 이용하는 이점이 된다. 특히, 분산전원 출현으로 인한 이러한 분산형 조류계산 기법의 필요성이 점점 증가하고 있다. 분산형 조류계산 알고리즘은 비동기 분산형과 동기화 분산 알고리즘으로 분류할 수 있다. 분리 계산 기법이 하나 이상의 배전계통을 가진 계통의 결합 조류계산에 사용된다면, 스칼라 경계 변수들은 상태 변수 벡터로 대체 할 수 있다.