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제작성을 고려한 복합재 로터 블레이드 단면 이산최적설계
원유진,이수용 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
본 논문에서는 제작성을 고려한 복합재 로터 블레이드 단면 이산최적설계가 수행되었다. 제작성을 반영하기위해 스킨두께, 토션박스 두께 그리고 스킨적층각은 이산설계변수로 고려되며 토션박스 위치 및 폭은 연속설계변수가 적용되었다. 목적함수로는 블레이드 질량을 설정하며 응력 파손지수, 질량중심, 전단중심, 고유진동수, 단위길이당 블레이드 최소질량과 같은 다양한 구속조건을 적용하였다. 본 연구를 통해서 작성된 로터 블레이드 단면 최적설계 통합 프로그램을 이용하여 스킨 적층각 및 스킨 두께 그리고 토션박스 두께, 토션박스 위치, 토션박스 폭과 같은 블레이드 단면 설계변수들이 결정되었다. In this paper, the disctrete optimal design of composite rotor blade cross-section considering manufacturability was performed. Skin thickness, torsion box thickness and skin lay-up angle were adopted as discrete design variables to consider manufacturability. The position and width of a torsion box were considered as continuous variables. An object function of optimal design is to minimize the mass of a rotor blade, and various constraints such as failure index, center mass, shear center, natural frequency and blade minimum mass per unit length were adopted. Finally, design variables such as the thickness and lay-up angles of a skin, and the thickness, position and width of a torsion box were determined by using an in-house program developed for the optimal design of rotor blade cross-section.
Structure of Direct RF Sampling Receivers for GNSS Signals
원유진,안우현,이민준,박찬식,서보석 사단법인 항법시스템학회 2014 Journal of Positioning, Navigation, and Timing Vol.3 No.3
A direct RF sampling method refers to a technique that directly converts a passband signal to an intermediate band or a baseband without using a mixer. This method is less complicated than an existing RF receiver because a mixer is not used. It uses digital processing after sampling, and thus can flexibly process signals in a number of bands using software. In this process, it is important to select an appropriate sampling frequency so that a number of signals can be converted to an intermediate band that is easy to process. In this study, going beyond previously studied direct RF sampling frequency selection methods, conditions that need to be additionally considered during receiver design were examined, and the structure of a direct RF sampling receiver that satisfies these conditions was suggested.
2016년도 서울과학수사연구소 검안사례들에 대한 통계분석
원유진,박정우,최승규,엄나현,김동영,서원준,최승우,이민제,유미영,박종필,최민성,김성호,이수경,윤웅재,김유훈,김이석,박성환,김장한,유성호,이숭덕,김재용,양경무,이한영,최영식 대한법의학회 2017 대한법의학회지 Vol.41 No.3
From January 1, 2016 to December 31, 2016, a total of 1147 postmortem inspection cases in Area 8, Seoul Metropolitan Police Agency (Gangseo, Yangcheon, and Guro police stations) were statistically analyzed. Autopsies were performed in 205 cases (17.9%), and the autopsy rates were 17.6% (75/426 cases) in the Gangseo police station, 9.5% (34/357 cases) in the Yangcheon police station, and 24.3% (82/337 cases) in the Guro police station. For 288 cases with an unknown cause of death, the autopsy rates were 70.0% (60/87 cases) in the Gangseo police station, 28.6% (26/91 cases) in the Yangcheon police station, and 63.1% (65/103 cases) in the Guro police station. For 65 cases due to fall from height, the autopsy rate was 7.7% (n=5). Of the 187 cases due to hanging, 155 cases were classified as suicide at the scene with a 4.5% (n=7) autopsy rate and 32 cases were classified as an undetermined manner of death at the scene with a 15.6% (n=5) autopsy rate. The distribution of the “manner of death” was natural death, 45% (n=516); unnatural death, 29.9% (n=343); and other and undetermined, 25.1% (n=288). Proportions of dispatch times were 50.9% (584 cases) during work hours (09:00-18:00), 13.8% (n=158) during evening hours (18:00-21:00), 13.4% (n=154) at night (21:00-00:00), 11% (n=126) at dawn (00:00-06:00), and 10.9% (n=125) during morning hours (06:00-09:00). The male-to-female ratio was 1.86:1 (746:401). These statistics are valuable for the evaluation of postmortem inspections by experts.
원유진,강경식 대한안전경영과학회 2019 대한안전경영과학회지 Vol.21 No.4
When the foundation work of the underground part of the building structure or the excavation work of the civil engineering structure is carried out, there is the earthwork work by the inevitable process. As the economic situation continues to develop, construction in urban areas is becoming bigger and higher in scale due to the expansion of infrastructure and the rescue of urban dwellings in urban areas, and excavation of underground roads is inevitable. Excavation of the underground part may cause problems in the process difficulty and safety of the earthworks due to the complexity and various characteristics of the ground selected without consideration of the ground characteristics and site conditions. In order to complete the required facilities, it is necessary to secure the design and construction of the retaining walls. In order to complete the required construction, It is an important factor satisfying construction period and economical efficiency.
이산설계변수를 고려한 복합재 로터블레이드 단면 최적설계
원유진,이수용,Won, You-Jin,Lee, Soo-Yong 항공우주시스템공학회 2014 항공우주시스템공학회지 Vol.8 No.1
In this paper, optimal design of composite rotor blade cross-section to consider manufacturability was performed. Skin thickness, torsion box thickness and skin lay-up angle were adopted as discrete design variables and The position and width of a torsion box were considered as continuous variables. An object function of optimal design is to minimize the mass of a rotor blade, and various constraints such as failure index, center mass, shear center, natural frequency and blade minimum mass per unit length were adopted. Finally, design variables such as the thickness and lay-up angles of a skin, and the thickness, position and width of a torsion box were determined by using an in-house program developed for the optimal design of rotor blade cross-section.