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박중용,권혁종 한국음향학회 2022 韓國音響學會誌 Vol.41 No.4
A model is developed for the calculation of sea surface generated ambient noise in the range dependent ocean environment. The sources are located in the horizontal plane all around and their depths are at the near-surface. The receiver array is located in the range dependent ocean waveguide. One-way coupled mode method is used to model the acoustic propagation between the sources and receiver in the range dependent waveguide, and the cross spectral density matrix of noise is derived. In simulation, noise intensity, beamforming result and coherence function are calculated from the cross spectral density matrix. These results are compared with those in the range independent environment. The modeling result shows the effect of the vertical directionality and asymmetry characteristics of the horizontal plane. 본 논문에서는 거리 종속환경에서 해수면에 의한 배경소음 모델링을 수행하였다. 모델링 환경에서 음원은해수면 근처에서 수평 방향의 전 영역에서 위치하고, 수신기 배열은 거리 종속환경의 해양 도파관 내에 위치하였다. 거리 종속환경에서의 소음원과 수신기 간의 음파전달은 연성모드법을 사용하여 계산되었으며, 이를 이용하여 수신기간 상호 스펙트럴 밀도행렬 식을 유도하였다. 계산된 상호 스펙트럴 밀도행렬은 소음 인텐시티, 빔형성 결과, 코히런스함수를 계산하는 데 사용되었으며, 그 결과를 거리 독립환경에서의 결과와 비교하였다. 이를 통해 해저면 특성에 의한수직 방향성과 거리 종속환경에 의한 수평면상의 비대칭성 특성이 모델링 결과에 반영됨을 확인하였다.
박중용,황창전,김준호,안이기,이정훈 한국항공우주연구원 2012 항공우주산업기술동향 Vol.10 No.1
본 논문에서는 최근 활발한 고속회전익기 기술개발 현황을 살펴보기 위하여 미국 시콜스키사의 X2, 유럽 유로콥터사의 X3, 미국 DARPA (Defense Advanced Research Project Agency)-보잉의 디스크로터, 러시아의 AHSH(Advanced High Speed Helicopter) 개발현황을 조사하였다. 특히 프로그램 상황 및 기술적인 달성도 측면에서 살펴보았다. 아울러 수직이착륙 및 제자리비행의 특장점을 살린 회전익기의 고속화를 달성하기 위한기술적과제를조사하였다. This paper describes the survey results on major high speed rotorcraft development programs such as Sikorsky X2, Eurocopter X3, DARPA(Defense Advanced Research Project Agency)-Boeing DiscRotor, and Russian AHSH(Advanced High Speed Helicopter). Each development program is investigated especially in viewpoints of program status and technical achievement. And some technical issues are surveyed to develop a high speed rotorcraft without any penalty in VTOL(Vertical Takeoff or Landing) and hovering attributes.
박중용,Park, Joongyong 한국시스템엔지니어링학회 2012 시스템엔지니어링학술지 Vol.8 No.2
About 20 years have passed since Systems Engineering(SE) was introduced in Korea. KCOSE(Korean Council On Systems Engineering) and KOSSE(The Korean Society of Systems Engineering) were established during that period and Korean SE community has increased quantitatively. But We can not answer "Yes!" for the questions "Did Korean SE community increase qualitatively? and How about SE education or training?" Many participants at SE lecture classes said that they were not able to understand SE concept. I analyzed current SE lecture materials and then proposed new model of SE concept lecture for SE novices. The new model consists of Vee diagram, life cycle model, PMTE paradigm, technical review, SE sample and definition of SE. I expect that the proposed model will contribute to upgrade a quality of domestic SE education.
Modelica를 이용한 헬기 로터 블레이드 동적해석 M&S 모델 개발
박중용,Park, Joongyong 한국시스템엔지니어링학회 2015 시스템엔지니어링학술지 Vol.11 No.2
This paper describes modeling & simulation(M&S) model for dynamic analysis of helicopter rotor blades. Simulation model is developed using Dymola tool which implements the open source language - Modelica. Modelica is appropriate for developing multibody dynamic analysis model. To develop an M&S model efficiently, model based systems engineering(MBSE) is applied. Some diagrams such as requirement diagram, block definition diagram and sequence diagram etc. are drawn to capture the concept of M&S model. This activity is done utilizing the open source tool - Papyrus.
기능 안전과 모델기반 시스템엔지니어링 - ISO 26262/DO-178C 중심으로
박중용,백승길,Park, Joongyong,Paek, Seung-Kil 한국시스템엔지니어링학회 2017 시스템엔지니어링학술지 Vol.13 No.1
Recently, the ratio of electrical part and embedded software has grown in automotive industry. ISO 26262, 'Road Vehicles - Functional Safety', was published to guide development of automotive electrical and electronic part in 2011. This paper describes definition of functional safety and analyzes ISO 26262. The comparison of ISO 26262 and DO-178C is made, then difference between them is identified. DO-178C provides guidance for the production of software for airborne system and equipment. The core of DO-178C is a relatively minor update to the previous DO-178B, however, the big changes are captured in the supplemented documents such as DO-331, 'Model-Based Development and Verification Supplement to DO-178C and DO-278A'. Model-based design is important to develop automotive and aircraft meeting the guidelines of ISO 26262 and DO-178C. In this paper, the sample case of applying MBSE(Model-Based Systems Engineering) to AVCS(Active Vibration Control System) software development is discussed.
PLM(Product Lifecycle Management)과 시스템엔지니어링과의 관계 고찰
박중용,Park, Jung-Yong 한국시스템엔지니어링협회 2004 시스템엔지니어링워크숍 Vol.4 No.-
This paper introduces the concept and market status of PLM, then analyses PLM with an SEview I focus on relations beween SE and PLM. I propose some research topics about integration of SE and PLM and I expect growth of PLM market be a good chance of SE territorial expansion and marketing.
박중용,추영민,이근화,성우제,Park, Jungyong,Choo, Youngmin,Lee, Keunhwa,Seong, Woojae 한국음향학회 2016 韓國音響學會誌 Vol.35 No.4
본 논문에서는 연성 모드 기반의 양상태 비상관 잔향음 모델을 제안한다. 거리종속 환경에서 단방향 연성모드 기반의 음파전달모델을 사용하여 음원에서의 산란체에 도달하는 음압과 산란체에서 수신원에 도달하는 음압을 계산한다. 계산의 편의 상 각 산란체와 음원 또는 수신기 사이의 음파전달은 산란체와 음원 또는 수신기를 잇는 2차원 평면에서만 일어난다고 가정한다. 모델의 타당성을 검증하기 위해, 미 해군 잔향음 모델링 워크숍 I, II에 제시된 문제에 대해 계산하고, 그 결과를 음선 이론 기반의 비상관 잔향음 결과와 비교했다. In this paper, the incoherent reverberation model based on coupled normal mode method is presented. In the range dependent environment, one way coupled normal mode method is used to calculate the pressure from a source to a scatterer patch and the pressure from a scatterer patch to a receiver. For the computational efficiency, the sound propagation from a source/receiver to the scatterer patch is assumed to occur only in the 2D plane where a source/receiver and scatterer patch are located. For the model verification, problems of the reverberation modeling workshop I and II sponsored by the US office of Naval Research are calculated and the results are compared with the incoherent reverberation model results based on the ray method.