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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.
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.
조경잡지의 광고로 살펴 본 퍼걸러 디자인의 유형변화 연구
이동화 ( Lee Dong-hwa ),이재용 ( Kim Choong-sik ) 한국경관학회 2021 한국경관학회지 Vol.13 No.2
본 연구는 당대 조경의 정보를 총망라하는 전문잡지인 「환경과 조경」의 광고면에 나타난 퍼걸러의 자료를 수집하여 시기별, 형태별 디자인의 전개 과정과 변화양상을 고찰하였다. 총 362권의 「환경과 조경」에 나타난 광고를 분석한 결과는 다음과 같다. 일반형이 355개로 전통형의 58개에 비해 큰 비중을 차지하였다. 전통형 퍼걸러는 1990년대에 36개로 가장 높았으나 2000년대 21개로 축소되었으며 2010년대에 이르러 광고에서 전통형 퍼걸러가 사라졌다. 반면에 일반형 퍼걸러는 2000년대 168개, 2010년대에 147개 등으로 빈도가 증가하였다. 유형 분류를 통해, 전통형에서 4개, 일반형에서 6개의 유형이 도출되었다. 전통형 퍼걸러는 마루와 난간 모두 갖춘 형태가 가장 많이 등장하였으며 기둥 또는 마루만 존재하는 형태는 지속적으로 감소하였다. 일반형에서는 사각기둥형이 가장 우세하게 나타났다. 1990년대까지 단일사주형과 복합사주형이 크게 양분했었다. 그러나 2000년대부터 일주형, 일체형, 폐쇄형 등 형태가 다양해졌다. 전통형과 일반형을 통틀어 목재는 미송, 하드우드, 합성목재 등이 주로 사용되었다. 이중 합성목재와 하드우드는 주로 철재 구조물과 결합하여 기둥 또는 서까래에 사용되었다. 본 연구는 잡지에 등장한 기성품의 광고를 중심으로 살펴보았기 때문에 창의적으로 설계된 퍼걸러의 경향을 살피지 못한 것과, 광고에 나온 기성품의 실제 설치된 경향을 분석하지 못한 것에 한계가 있다. 그러나 대량의 수요와 공급이 이루어지는 기성품에 대한 고찰을 통해서 퍼걸러의 시대적 변화와 이에 따른 휴게공간의 경관 변화요인을 살펴본 것으로 의의가 있다. This study collected Pergola’s data on the advertisement page of 「Environment and Landscape」, a specialized magazine covering the information of landscape Architecture at the time, and examined the development process and change of design by period and form. The results of analyzing the advertisements shown in a total of 362 volumes of 「Environment and Landscape」 are as follows. There were 355 general types, accounting for a larger proportion than 58 traditional types. Traditional pergolas were the highest at 36 in the 1990s, but were reduced to 21 in the 2000s, and by the 2010s, traditional pergolas disappeared from advertisements. On the other hand, the frequency of general pergolas increased to 168 in the 2000s and 147 in the 2010s. Through the classification of types, four types were derived from the traditional type and six types from the general type. Traditional pergolas had the most shapes with both floors and railings, and the shape in which only pillars or floors existed continued to decrease. In the general type, the square column type was the most dominant. Until the 1990s, single-4pillars and complex-4pillars types were largely divided. However, since the 2000s, forms such as single pillar, integral, and closed types have diversified. Throughout the traditional and general types, wood such as american pine, hardwood, and artificial timber were mainly used. Among them, artificial timber and hardwood were mainly combined with steel structures and used for pillars or rafters. Since this study focused on advertisements of ready-made products appearing in magazines, there is a limit to not being able to examine the trend of creatively designed pergolas. However, it is meaningful to examine the changes in the times of Pergola and the consequent landscape changes in rest areas through consideration of ready-made products that are supplied with a large amount of demand.
경량화에 대한 안전성을 고려한 로우컨트롤암의 다목적 최적설계
이동화(Dong Hwa Lee),박영철(Young Chul Park),허선철(Sun Chul Huh) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.4
Recently, miniaturization and weight reduction is getting more attention due to various benefits in automotive components design. It is a trend that the design of experiment(DOE) and statical design method are frequently used for optimization. In this research, the safety of lower control arm is evaluated according to its material change form S45C to AI6061 for the reduction of arm's weight. The variance analysis on the basis of structure analysis and DOE is applied to the lower control arm. We have proposed a statistical design model to evaluate the effect of structural modification by performing the practical multi-objective optimization considering mass, stress and deflection.