• Aerospace Engineering and Technology
• /
• v.8 no.1
• /
• pp.117-131
• /
• 2009

In this study, a detail design was conducted for KSLV-1 1st stage Rear Fuselage Upper Compartment assembly. A basic structural sizing was done by the aircraft fuselage sizing in-house program. The frame structural design and the interface check were conducted by the FE and the CAD program. The structural margin of safety was conformed by FE analysis for the normal section model and duct cut-out section models which are the weakest parts of the rear fuselage. The shear stress analysis was performed for a fastener design of the skin-stringer which is most affected by the shear stress induced by the shear load.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.33 no.4
• /
• pp.209-216
• /
• 2020

In this paper, parametric structural analysis is presented utilizing the co-rotational(CR) shell analysis utilizing EDISON. CR shell analysis shows faster convergence than the commercial software, NASTRAN, does. The 1st natural frequency of the rear frame is obtained, which is close to that of the engine during high speed cruise. Three cases under two design variables are presented and analyzed. Gusset is shown to be more effective among those which feature the same weight change. The results presented in this paper will be applicable for further researches to improve the durability of a motorcycle rear frame.

• Digital Contents
• /
• no.1 s.80
• /
• pp.87-91
• /
• 2000

지난 호에는 인터넷 유통업의 대표적인 형태인 인터넷 쇼핑몰 운영을 위한 내부 프로세스 에이전트를 정의하였다. 또한 인터넷 쇼핑몰의 후방 프로세스를 분석해 보았으며 이를 토대로 다양한 운영층 프로세스 에이전트 유형과 특성을 정의하였다. 또한, 다수의 에이전트로 구성된 프로세스 에이전트팀 조직과 활동 원칙도 제시하였다. 이번호에는 인터넷 쇼핑몰 후방 프로세스 에이전트의 참조 구축 프레임 워크를 제시한다

• Journal of IKEEE
• /
• v.23 no.1
• /
• pp.235-241
• /
• 2019

In this paper, we propose a new algorithm to detect rear-approaching vehicle using the frame similarity of ROI(Region of Interest) based on deep learning algorithm for use in agricultural machinery systems. Since the vehicle detection system for agricultural machinery needs to detect only a vehicle approaching from the rear. we use Faster R-CNN model that shows excellent accuracy rate in deep learning for vehicle detection. And we proposed an algorithm that uses the frame similarity for ROI using constrained conditions. Experimental results show that the proposed method has a detection rate of 99.9% and reduced the false positive values.

• Journal of Korean Society for Geospatial Information Science
• /
• v.17 no.3
• /
• pp.49-56
• /
• 2009

Recently, a generation of high quality mosaic images from video sequences has been attempted by a variety of investigations. Among the matter of investigation, in this paper, generation on stereo mosaic utilizing airborne-video sequence images is focused upon. The stereo mosaic is made by creating left and right mosaic which are fabricated by front and rear slices having different viewing angle in consecutive video frames. For making the stereo mosaic, motion parameters which are able to define geometric relationship between consecutive video frames are determined. For determining motion parameters, affine model which is able to explain relative motion parameters is applied by this paper. The mosaicing method using relative motion parameters is called by free mosaic. The free mosaic proposed in this paper consists of 4 step processes: image registration with reference to first frame using affine model, front and rear slicing, stitching line definition and image mosaicing. As the result of experiment, the left and right mosaic image, anaglyphic image for stereo mosaic images are showed and analyzed y-parallax for checking accuracy.

• Industry Promotion Research
• /
• v.4 no.2
• /
• pp.1-8
• /
• 2019

This research is a technology for cutting the insulation of the busbar (busbar) installed in the distribution panel or switchboard, the results of the study, first, the cutting unit and frame of the cutting unit including a housing attached to the upper and lower cutters, respectively Busbar coating laser cutting machine is installed on the top, characterized by consisting of a stopper for adjusting the coating cutting distance of the busbar. Second, the frame is installed with the guide bar in the longitudinal direction at the top so as to be located at the rear side end of the table, the post is installed vertically at the front and rear at the upper middle part, respectively, and cut to the table at the outer side of the front post. It is characterized by the formation of holes. Third, the supporter is fixedly installed on the upper part of the guide bar arranged in the frame, and is characterized by consisting of a cylinder and a support plate. The meaning of this study is to prevent the safety accidents of workers, to improve the efficiency of cutting work, and to prevent the occurrence of scratches on the surface of the busbar.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 1998.10a
• /
• pp.17-17
• /
• 1998

1970년대에 개발된 Ti-15-3 합금은 상온에서 우수한 성형성을 가지고 있어 Ti-6-4 합금보다 성형 공정을 대폭 감소시킬 수 있어 생산비용을 크게 감소시킬 수 있는 장점이 있는 합금이다. 또한, 냉간 성형성이 우수하고 강화 범위가 폭넓기 때문에 항공기의 프레임, 항공기 압력 용기 및 고장력 유압 튜브 등에 많이 사용하고 있으나, 열간 성형성이 Ti-6-4 티타늄 합금보다 좋지 않기 때문에 이제까지의 적용 분야는 판재 성형 등의 한정된 분야에만 적용되어 오고 있는 실정이다.

• Digital Contents
• /
• no.12 s.79
• /
• pp.60-66
• /
• 1999

인터넷 유통업은 기본적으로 대량 트랜잭션 발생을 목표로 한다. 본 글에서는 인터넷 유통업의 대표적인 형태인 인터넷 쇼핑몰 운영을 위한 내부 프로세스 에이전트를 정의하고 다음호에는 이들이 참조 구축 프레임워크를 제시한다. 인터넷 쇼핑몰의 후방 프로세스를 분석해보고 이를 토대로 다양한 운영층 프로세스 에이전트 유형과 특성을 정의한다. 또한 다수의 에이전트로 구성된 프로세스 에이전트팀 조직과 활동 원칙도 제시한다. 에이전트의 구현을 위해 멀티쓰레딩 기법을 사용한다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.19 no.4
• /
• pp.47-53
• /
• 2011

Firstly, FEM model for the body frame of a fuel cell vehicle was built up and design optimization results based on different schemes were exhibited. One scheme was to minimize weight while maintaining the normal mode frequencies and the other was to increase the frequencies without weight change. Next, for a rear frame model, shape parameter study on collapse characteristics such as peak resistance load and absorbed energy was carried out. Also, the stiffness of frame mounting brackets was predicted using inertance calculation and the durability of those mounting brackets for vehicle system loads was evaluated. Finally, for a representative mounting model, the influence on durability due to thickness change was analyzed.

• Journal of the Korean Society for Precision Engineering
• /
• v.18 no.10
• /
• pp.76-83
• /
• 2001

This paper is concerned with the analysis of the forming characteristics of radial-backward extrusion. The single action pressing is analyzed by using the rigid-plastic FEM. The design factors such as die corner radius, gap height, and friction factor are involved in the simulation. The analysis is focused on the influences of the design factors on the maximum punch farce and metal flow into can and flange region. As a result of analysis, the gap height among the design factors is known to have a major effect on the metal flow of radial-backward extrusion for single action pressing compared with other design factors. As is expected, forming load and volume of flange increase as gap height and die corner radius increase, respectively.