• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2008.11a
• /
• pp.863-867
• /
• 2008

Value Engineering is one of the most effective too13 to achieve the required cost and time reduction, quality and safety improvement. The role and importance of design value engineering is expected to be high, so the research is needed for its effective accomplishment. Therefore, in this research we have suggested the method of checklist development for the effective accomplishment of design value engineering work. Also, the way of development is that derives major elements from drawing information category and from the base of the derived elements, the research lists up the checklist items. At last, it developed design value engineering checklist based the item that listed up throughout the experts.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2008.11a
• /
• pp.405-408
• /
• 2008

It is increased concerns that review the design based on the economic efficiency, VE(Value Engineering), in construction industry. Also, the effectiveness of VE case study has reported very variously in the domestic and foreign construction industry. The phase of drawing idea VE process is important because of real cost saving effect. The design review checklist in the phase of drawing idea make more effective VE. The research suggests the method and process of design review checklist focusing on the construction work in this study. Also, it proposes the useful process with the exited VE procedure.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2005.05a
• /
• pp.73-77
• /
• 2005

In this work, the influences of tool temperature on the formability of AZ31 sheet material in warm deep drawing processes of square cup were investigated. Deep drawing tests under different tool temperatures for magnesium alloy sheet at elevated temperature $250^{\circ}C$, where AZ31 sheet shows a good formability, and FE analyses were carried out. The successfully formed part without any defects was obtained when temperature of tool was over $100^{\circ}C$ while the fracture was occurred at the corner of the square cup below $100^{\circ}C$. It is shown that lower temperature of tool than that of magnesium sheet causes the temperature drop of the material by heat transfer and thus Interrupts the dynamic recrystallization of it. Therefore, in order to obtain successful part of magnesium alloys, it is necessary that the tool temperature is limited to the same or slightly lower temperature than sheet material.

• 한국HCI학회:학술대회논문집
• /
• 2008.02b
• /
• pp.417-423
• /
• 2008

It produced a movie to show spectators by interacting the existing famous drawings. It tried a new concept of binding a famous drawing with a person. It recognizes the color of a spectator and the drawings are changed. A spectator is reflected in the work of Marc Chagall. At the same time it is expressed with different BGM that meets the identity of a work. When a spectator moves, the motion is reflected on a work. But without a motion, a work is naturally shown. The four famous drawings are produced to response to Red, Green and Blue of a spectator according to color tracking.

• Korean Journal of Materials Research
• /
• v.15 no.10
• /
• pp.632-638
• /
• 2005

To investigate the effect of Mo and Cu contents on tensile strength of cold drawn stainless steel 304H wires, metallographical and mechanical tests were performed for the wire specimens drawn to different drawing strains at room temperature. It was confirmed that the contents of Mo ana Cu have little influence on the tensile strength of drawn specimens, even though the strain induced martensite transformation decreased with increasing the contents of Mo and Cu. These results were explained by the strengthening of the formed martensite itself due to the solid solution effect of interstitial solutes, carbon and nitrogen. The contents of these elements were slightly higher in the specimens containing additionally added Mo and Cu.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.20 no.6
• /
• pp.1810-1818
• /
• 1996

A new finite elemetn approach is introduced for direct prediction of bland shapes and strain distributions from desired final shapes in sheet metal forming. The approach deals with the geometric compatibility of finite elements, plastic deformation theory, minimization of plastic work with constraints, and a proper initial guess. The algorithm developed is applied to cylindrical cup drawing, square cup drawing, and fron fender forming to confirm its validity by demonstratin reasonable accurate numerical results of each problems. Rapid calculation with this algorithm enables easy determination of various process variables for design of sheet metal forming process.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 1999.03a
• /
• pp.18-21
• /
• 1999

The wrinkling of thin sheet metal induced by compressive instability is one of major defects in sheet metal forming processes. compressive instability is influence by many factors such as mechanical properties of the sheet material geometry of the sheet contact conditions and plastic anisotropy. The analysis of compressive instability in a plastically deforming body is rather difficult because the effects of the above-mentioned factors are rather complex and the instability behavior may show swide variations even for small deviations of the factors. in this work the bifurcation theory is introduced for the finite elemental analysis of the instability behavior of a thin sheet with initially sound geometry and property. All the above-mentioned factors are conveniently considered by the finite element method. The instability limit is found by introducing a criterion scheme into the incremental analysis and the post-bifurcation behavior is analyzed by introducing the branching scheme. Wrinkling initiation and growth in the deep drawing process are analyzed.

• Journal of the Korean Society for Precision Engineering
• /
• v.14 no.5
• /
• pp.22-33
• /
• 1997

This paper describes a research work of developing a computer-aided design of blanking and piercing for stator and rotor parts. Based on knowledge-based rules, the die design system, STRTDES2, is designed by considering several factors, such as complexities of blank geometry and punch profile, and availability of press equipment and standard parts. Therefore this system can carry out a die design for each process which is obtained from the result of an automated process planning system, STRTDES1 and generate part drawing and the assembly drawing of die set in graphic forms. Knowledges for die layout are extracted from plasticity theories, relevant references and empirical know-hows of experts in blanking industries.

• Proceedings of the KSME Conference
• /
• 2000.11b
• /
• pp.674-679
• /
• 2000

An air handling unit(AHU) has been usually designed by manual calculations. Drawing works together with design calculations should be redone far every designing work, and also be needed to make some corrections of them. In order to design the AHU more efficiently, an AHU program has been developed. The developed program on the Windows environment is operated by the graphic user interface(GUI) realized using the Visual Basic Interpreter. The program provides calculation sheet of coils, weights and pressures in a MS-Excel file format as well as design drawing of the AHU in a Auto CAD file format idealized by AutoLISP. Those files of the commercial softwares make easier for a designer to transfer design results to the another company for bid via e-mail.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.15 no.5
• /
• pp.1407-1416
• /
• 1991

본 연구에서는 Liu의 수식화를 바탕으로 가공 경화성을 고려하여 수식화를 재 구성하고, 유한요소 프로그램을 개발하여 평면 변형 인발문제를 극한 해석함으로써, 성형에 필요한 한계 하중 및 최적 속도장을 직접적으로 구하였다.수렴되어진 최적 속도장으로 각 요송에서의 변형률 속도, 변형률 및 격자 변형등을 수치적으로 계산함 으로써 가공에 따른 변형 특성도 파악하였다. 한계 하중은 항공기 구조용 소재인 알 루미늄 6061 재료를 이용하여 판재 인발 실험을 행함으로써 얻은 결과치와 비교 검토 하였으며, 유동 특성을 관찰하기 위하여 격자 왜곡(grid distortion) 실험을 하여 얻 은 변형 패턴과 수치 계산에서 구한 격자변형 패턴을 상호 비교하였다.