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이대형(Daehyung Lee),유승환(Senghwan Yoo),김영배(Yeongbae Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Kinematic sensitivity analysis of suspension systems is usually performed in absolute coordinates. Design of a suspension system requires detailed specification of the interconnection point (hard point) and characteristic values of compliance elements. During the design process. these design variables are determined to meet some prescribed performance targets expressed in tenms of SDF(Suspension Design Factors), such as toe. camber. caster, etc. When some designer want to modify the dynamic characteristic of designed vehicle, it has been taken a lot of time. effect and inconveniences. To solve these inconveniences, this paper elaborates on a systematic approach to achieve optimum design of suspension systems through making an analysis of sensitivity for multi-body systems.<br/>
이대형(Daehyung Lee),김영배(Yeongbae Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Walking robot is classified into biped, quadruped and hexaped, etc., according to the number of leg linked to the robot body. In this study a quadruped robot is developed and stability of the robot is analyzed. Using the WBO(Weight Balancing Oscillator) built in the body is proposed and the control method of it is studied. Walking is classified into static and dynamic walking according to the duty factor. In dynamic walking, one of the very important issues is stability that is influenced by the position of ZMP. The WBO is mounted on the body of the robot developed in this study. That is designed to linearly move from side to side when the robot walk dynamically. Robot body is without sacrifice of the walking speed by control the WBO. This means improvement of the stability.
안성민(Sungmin Ahn),이호택(Hotaek Lee),이대형(Daehyung Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The head restraints is a safety device to protect head and neck from a car crash. Although, the rear-seat head restraints should be designed with the comfort of head as well as the clear vision of back side for driver. These goals conflict with each other because the smaller size is much better for the vision but the certain size is essential for the comfort of head. In this study, I focused on finding the factors influences to the comfort of occupant"s head and neck in a car by using the subjective comfort evaluation, step-wise regression analysis and correlation analysis. Furthermore, I suggest the minimum size of head restraints satisfies with key factors of comfort by analyzing the vehicles on the market.
조선 블록조립공장에서 용접 정보를 이용한 실적집계 및 모니터링 방안
안의국(Eui Koog Ahn),이호윤(HoYoon Lee),이대형(DaeHyung Lee),윤태혁(Tae Hyuck Yoon),강용우(Yong Woo Kang),왕지남(Gi Nam Wang),박상철(Sang Chul Park) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
During this time of global recession, the shipbuilding industry is exerting much effort to make profits, gradually intensifying the competition. In shipbuilding, however, the Engineering To Order (ETO) production method and production process are difficult and frequently changeless. Thus, the shipbuilding process must be actively reflected on the schedule plan rather than setting up a fixed plan once and sticking to it. For this purpose, a monitoring system must be developed, which obtains field performance data as accurately and quickly as possible. However performance data collection are difficult without a performance data collecting and monitoring system. In this paper, a method for identifying the progress of detailed processes for blocks by facilitating the data input into the block erection process, and for differentiating fitting and welding using the current values obtained from the welding machine, present. Furthermore, this paper propose a method of identifying the work progress of blocks through a correlation equation between the welding length and arc time of the block based on the acquired current data. Then the proposed method verify through experiments and suggest for progress management in block assembly shop of shipbuilding.
Fuzzy-FMEA를 이용한 동적위치제어 시스템의 고장유형 우선순위 도출
백경동(Gyeongdong Baek),김성신(Sungshin Kim),천성표(Seongpyo Cheon),서흥원(Heungwon Suh),이대형(Daehyung Lee) 한국지능시스템학회 2015 한국지능시스템학회논문지 Vol.25 No.2
동적 위치제어 시스템(Dynamic Positioning System)의 위험성과 신뢰성 평가에 FMEA(Failure Mode and Effect Analysis)를 적용하고 있으나, 해양 프로젝트가 가진 특징으로 인해 다음과 같은 한계를 가진다. 1) SCADA(Supervisory Control and Data Acquisition) 시스템을 통해 수집되는 고장 데이터의 일부는 환경의 영향으로 인한 오작동이나 단순한 센서고장으로 인해 생성되는 데이터를 포함하고 있으므로 불완전하고 신뢰할 수 없다. 따라서, FMEA의 세 가지 변수인 심각도(Severity), 발생빈도(Occurrence), 검출빈도(Detection)의 평가는 전문가 지식에 근거한다. 2) 전문가들의 주관적인 판단에 전적으로 의존할 경우 위험 요소들을 정밀하게 평가하기 어렵다. 3) 위험 요소들 사이의 상대적인 중요도는 고려되지 않아 위험우선순위가 명료하게 표현되지 않는다. 4) 서로 다른 고장모드에 대해 동일한 위험 우선순위 값을 가질 경우 상대적인 중요도를 판단하기 어렵다. 이러한 문제점을 극복하고 기존의 FMEA의 효과를 높이기 위해, Fuzzy-FMEA를 제안하고, 선박/해양 프로젝트의 동적 위치제어 시스템의 FMEA 문서에 적용하였다. 본 논문은 DP FMEA, DP FMEA 입증 시험서(DP FMEA Proving Trials)에 나타낸 전문가 지식을 퍼지 모델로 구현하여 FMEA 위험우선순위(RPN; Risk Priority Number)에 위험요소들의 상대적인 중요성을 포함시켰다. 제안한 방법은 해양 프로젝트의 동적 위치제어 시스템의 기계 및 전장 장비에 적용하여 기존의 FMEA와 비교하였다. Failure Mode and Effects Analysis (FMEA) has been used by Dynamic Positioning (DP) system for risk and reliability analysis. However, there are limitations associated with its implementation in offshore project. 1) since the failure data measured from the SCADA system is missing or unreliable, assessments of Severity, Occurrence, Detection are based on expert`s knowledge; 2) it is not easy for experts to precisely evaluate the three risk factors. The risk factors are often expressed in a linguistic way. 3) the relative importance among three risk factors are rarely even considered. To solve these problems and improve the effectiveness of the traditional FMEA, we suggest a Fuzzy-FMEA method for risk and failure mode analysis in Dynamic Positioning System of offshore. The information gathered from DP FMEA report and DP FMEA Proving Trials is expressed using fuzzy linguistic terms. The proposed method is applied to an offshore Dynamic Positioning system, and the results are compared with traditional FMEA.
이대형 洌上古典硏究會 2002 열상고전연구 Vol.16 No.-
A lot of plays and novels were written about Cho-mue(趙武). The Cho-mue story originated in Chin(晉) during the era of Ch'un-ch'iu(春秋). In the Choson Kingdom of the 19th century, the Chinese-transcription named Cho-mue jun(趙武傳) was created mainly through adaptin Tung-Chou Lieh-Guk Chih(東周列國持) and addign more text. This is a type of kun-dam soseol(軍談小說). The only Cho-mue jun text might not have affected other works written after it. The hangul-transcription named Jung-young jeu-gue jun(程영杵臼準) strengthened magical characters. Jung-young() and Jeu-gue() became the main characters of Jung-young jeu-gue jun, contrary to their roles in Cho-mue jun. Jung-young jeu-gue jun is closely related to Jung yeulsa jun() which was based on historical facts. It is said that there are both a handwritten and a printed book of Jung yeulsa jun. But both are in north Korea now, so I sould not review them. Myungsasypli(), Bosymlok() and Keumnang-isan() were published in the early 20th century. These works altered the character's names and the period of the Cho-mue story. It also used the traditional narrative techniques of Choson writers.