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이유경 ( Yukyoung Lee ),김현지 ( Hyeonji Kim ),홍기재 ( Ki-jae Hong ),강혁규 ( Hyuk Kyu Kang ),한욱신 ( Wook-shin Han ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2
데이터로그는 논리형 선언형 프로그래밍 언어로, 특히 재귀적인(recursion) 알고리즘을 표현하기 편리한 언어이다. 대표적인 데이터로그 시스템으로는 CORAL, LogicBlox, XSB, Soufflé 가 있다. 본 논문에서는 이 네 가지 시스템의 특징을 설명하고, 세 가지 벤치마크, 이행적 폐쇄(Transitive closure), 동세대(same generation), 포인터 분석(pointer analysis)으로 데이터로그 시스템들의 재귀 질의 (recursive query) 처리 성능을 비교하였다.
항공기 외부 장착물 장착 경계조건의 중력 방향에 따른 동특성 영향 분석
박지환(Jihwan Park),정회인(Hoein Jeong),이유경(Yukyoung Lee),안선규 (Sungyu Ahn) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.5
In order to verify durability in the vibration environment of the Swaybrace-Lug mounting type aircraft external store, vibration testing was carried out in accordance with the MIL-STD-810. The vibration test fixture transmits vibrations that began at the bottom of the test fixture in contrast to direct vibrations in the Swaybrace-Lug mounting structure. Therefore, the inherent frequency of vibration may vary due to the influence of the test fixture and the vibration applied to the store may become excessive. Additionally, reverse mount vibration test fixture was designed for direct attachment to the Swaybrace-Lug mounting structure. To confirm this hypothesis, the resonant frequency and resonant response of the forward mounting and reverse mounting were compared at the frequency of interest. Additionally, confirmation was done by applying the Modal Assurance Criterion to objectively identify dynamic differences in mode frequencies.
항공기 탑재 발사대의 발사관 장입 로켓의 로켓 장입 상태에 따른 동특성 변화 분석
정회인(Hoein Jeong),박지환(Jihwan Park),남규빈(Guebin Nam),이유경(Yukyoung Lee) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.5
This paper presents an analysis of a change in the dynamic characteristics with respect to the loading status of the rocket which is loaded in a launch tube of an airborne launcher. In addition, it determines the procedures for durability test. It was confirmed that the acceleration response of rockets depends on the distance of the airborne launcher from the mount, and the number of rockets loaded in the airborne launcher. The acceleration response increased with an increase in the distance of the airborne launcher from the mount, while it decreased with an increase in the number of rockets loaded in the airborne launcher. Consequently, it is proved that the most efficient test to verify the durability of the rocket is through loading one rocket at a suitable distance between the launcher and the mount. Moreover, frequency analysis showed that the natural frequency decreases and damping ratio increases as the number of rockets increases. This observation is expected to help in the design to avoid natural frequency.