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고분자 세라믹 전구체를 이용한 반응 소결 탄화규소의 접합
이동화,김득중,Lee, Dong-Hwa,Kim, Deug-Jooug 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.1
Reaction bonded silicon carbide (RBSiC) is an important engineering ceramic because of its high strength and stability at elevated temperatures, and it is currently fabricated using reasonably cheap manufacturing processes, some of which have been used since the 1960s. However, forming complicated shapes from these materials is difficult because of their poor workability. The purpose of this work is to join the reaction-bonded SiC parts using a preceramic polymer as joint material. The manufacturing of ceramic material in the system Si-O-C from preceramic silicon containing polymers such as polysiloxanes has attained particular interest. The mixtures of preceramic polymer and filler materials, such as SiC, Si and MoSi, were used as a paste for the joining of reaction sintered SiC parts. The joining process during the annealing in Ar atmosphere at $1450^{\circ}C$ were described. The maximum strength of the joints was 63 MPa for the specimen joined with 10 vol.% of $MoSi_2$ and 30 vol.% of SiC as filler materials. Fracture occurred in the joining layer. This indicates that the joining strength is limited by the strength of the joint materials.
비협동 양상태 소나에서 적함 송신기의 단일 능동 신호와 해저 지형 정보를 이용한 송신기 정보 추정
이동화,남종근,정태진,이균경,Lee, Dong-Hwa,Nam, Jong-Geun,Jung, Tae-Jin,Lee, Kyun-Kyung 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2
The bistatic sonar operations using a spatially-separated source and receiver are classified into cooperative and non-cooperative operations. In the cooperative operation, an active signal of a friendly ship is used and the source information is known previously. In the non-cooperative operation, an active signal of the enemy is used and it is difficult to find out the source information. The source information consists of the range, speed, course and frequency of the source. It gives advantage to operating bistatic sonar. This paper suggests a method of estimating the source information with geographic information in the sea and the single-ping of the enemy. The source range is given using one geographic point. And the source speed, course and the frequency of the enemy's source signal are given using two geographic points. Finally, the validity of the scheme is confirmed through a simulation study.
이동화(Dong-hwa Lee),박영철(Young-chul),강창경(Chang-kyoung Kang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
Requirement terms in the development of automobile Part are progressed about light weight damage prevention by fatigue, and safety of product. Already, The before study was gained suitably the good result about light weight in the expected period of this time when they changed the metal of lower control arm. But in the case of automobile part, it was concerned with life of people. and in the result, the fatigue life is very important. In this requirement, when we: drive a car, our car is applied to the cycle load. Estimation of the fatigue properties must have respect to the design process. Estimation of the fatigue life by using the design of experiments give occasion to the decrease effect of the automobile part development time. In these days of rapidly growth, This new process is help to competition ability of automobile industry and this study will bring forth a large safety property and last development effect. finally, we wish to bring forth the one example about the fatigue life optimization of lower control arm.