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근사 1차원 솔버를 이용한 이중모드 램제트 연소실 해석
양재훈(Jaehoon Yang),남재현(Jaehyun Nam),강상훈(Sanghun Kang),여재익(Jai-ick Yoh) 한국항공우주학회 2021 韓國航空宇宙學會誌 Vol.49 No.11
본 연구에서는 스크램제트 제어모델 정립을 위한 1차원 연소기 해석 솔버가 구축되었다. 유체에 대한 지배방정식 및 아레니우스 식 기반의 연소모델, 연료분사모델이 솔버 내에 구현되었으며, 해석이 수행되었다. 솔버의 검증을 위하여 0차원 점화지연 문제 및 1차원 스크램제트 연소해석 문제가 도입되었으며, 현 솔버가 선행 문헌의 결과들을 성공적으로 재현해 내고 있음을 확인하였다. 이어서 아음속 조건에서의 해석을 위한 램제트 해석 알고리즘이 구축되었으며, 열질식 위치를 통해 램제트 조건에서 연소기 입구 마하수를 확정하는 해석이 수행되었다. 램조건에서 PCST (precombustion shock train) 해석을 위한 모델이 도입되었으며, 천이구간 해석을 위한 알고리즘이 도입되었다. 또한 코드 내 램모드 해석의 적절성을 판단하기 위해 격리부 내 의사충격파 길이를 통해 불시동 발생 여부가 분석되었다. In this work, a one-dimensional combustor solver was constructed for the scramjet control model. The governing equations for fluid flow, Arrhenius based combustion kinetics, and the injection model were implemented into the solver. In order to validate the solver, the zero-dimensional ignition delay problem and one-dimensional scramjet combustion problem were considered and showed that the solver successfully reproduced the results from the literature. Subsequently, a ramjet analysis algorithm under subsonic speed conditions was constructed, and a study on the inlet Mach number of the combustor was carried out through the thermal choking locations at ram conditions. In such conditions, a model for precombustion shock train analysis was implemented, and the algorithm for transition section analysis was introduced. In addition, in order to determine the appropriateness of the ram mode analysis in the code, the occurrence of an unstart was studied through the length of the pseudo-shock in the isolator. A performance analysis study was carried out according to the geometry of the combustor.
스크램제트 추진 시스템의 비행 제어를 통한 연소기의 추력 분석
고효상(Hyosang Ko),양재훈(Jaehoon Yang),여재익(Jai ick Yoh),최한림(Hanlim Choi) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.1
The PID controller with fin angle and thrust as control input was designed based on the aerodynamic data of scramjet system. Flight simulation following a given trajectory which strike the target point after climb and cruise with constant dynamic pressure was conducted. After that, the required thrust for the climb and cruise was calculated and the required fuel flow rate for the hydrogen fuel dual mode scramjet combustor was analyzed. The combustor analysis of this study which conducted on integrated model of independently developed inlet, combustor, nozzles and external aerodynamic models, laying the foundation for the integrated design of the air breathing hypersonic system.
유아 특성을 고려한 AI 윤리 프레임워크와 규제 방향 도출에 관한 연구
정광식(Kwang Sik Jeong),양재훈(Jaehoon Yang),박건철(Keon Chul Park) 한국디지털콘텐츠학회 2024 한국디지털콘텐츠학회논문지 Vol.25 No.8
Various organizations worldwide have issued artificial intelligence (AI) principles to address ethical issues arising from AI development. However, there is a lack of research on AI principles that consider the characteristics of young children, who are particularly vulnerable to misuse of AI. This study aimed to propose an ethics framework for child-centered AI and suggest regulatory directions for the safe and sound use of AI by young children. To achieve this, we reorganized elements from existing AI principles with a focus on childhood characteristics and applied the Analytic Network Process, a multi-criteria decision-making methodology, to prioritize important ethical elements. The study further explored suitable regulatory directions for AI ethics considering children and examined changes in element priorities and regulatory directions in response to shifts in social awareness using sensitivity analysis. The results of this study are expected to provide academic, industrial, and policy-related implications for preventing misuse and promoting sound use of AI, which ultimately aids AI companion technology advancement for enhancing socio-emotional development in young children.