• Proceedings of the KIEE Conference
• /
• 2004.04a
• /
• pp.21-23
• /
• 2004

In this paper, an optimal design method to have good performance is researched. The parameters which are sensitive to the performance are examined and selected by using evolutionary computations and commercial CAD program to have good performance. Design method Simulated are compared with conrrentional procedure.

• Proceedings of the KSR Conference
• /
• 2002.10a
• /
• pp.666-671
• /
• 2002

All work related to maintenance of track has been impletemented on the basis of the measured result from EM series cars in Korea. However, since these types of cars measure only versine value of the track irregularities instead of the real ones, this method will cause the confusion to maintenance operators if commercial speed should increase. This study was showing and explaining the program developed to get the real irregularities from the versine value. Finally, the reconstruction profiles completed by two different methods were compared with artificial track irregularities to confirm the their practicality.

• Current Industrial and Technological Trends in Aerospace
• /
• v.6 no.1
• /
• pp.65-73
• /
• 2008

As the system requirements of performance, weight, cost are increasing, the needs of electronic parts which have high performance and efficiency are growing. To satisfy such requirements, demand of high performance and rapid upgraded commercial parts is also increasing compared to NASA or ESA standard parts. Especially, commercial PEM(Plastic Encapsulated Microcircuit) parts are applied in many space programs and research is continuing to broaden its application area. In this paper, concerns and verification trends of commercial PEM parts in space applications are introduced.

• New & Renewable Energy
• /
• v.7 no.4
• /
• pp.50-57
• /
• 2011

A wind turbine simulation program for the coupled dynamics of aerodynamics, elasticity, multi-body dynamics and controls of turbine is newly developed by combining an aero-elastic code and a multi-body dynamics code. The aero-elastic code, based on the blade momentum theory and generalized dynamic wake theory, is developed by NREL(National Renewable Energy Laboratory, USA). The multi-body dynamics code is commercial one which is capable of accounting for geometric nonlinearity and twist deflection. A turbulent wind load case is simulated for the NREL 5-MW baseline wind turbine model by the developed program and FAST. As a result, the two results agree well enough to verify the reliability of the developed program.

• 제어로봇시스템학회:학술대회논문집
• /
• 1997.10a
• /
• pp.848-851
• /
• 1997

A graphic simulation program is developed to assimilate the remote dismantling process of research nuclear reactors. This program makes extensive use of a commercial robot graphic instruction program. Firstly, a realistic graphic model of research reactors are built along with various dismantling equipments. Using the graphic instruction languages provided by IGRIP, then, a graphic process simulation program is developed that operates interactively with the user. Consequently, it is made possible for a process designer to visualize an arbitrary dismantling sequence and interactively modify the process. It is expected that the developed system will be utilized as an effective operator aid in both design and execution phases of remote dismantling of research reactor.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.6 no.4
• /
• pp.89-99
• /
• 2003

Smoothed particle hydrodynamics, SPH, is a gridless Lagrangian technique which is a useful alternative numerical analysis method to simulate high velocity deformation problems as well as astrophysical and cosmological problems. The SPH method brings about some difficulties such as tensile Instability and stress oscillation. A new SPH method, so called normalized algorithm, was introduced to overcome these difficulties. In this paper we aimed to estimate this method and have developed an one-dimensional normalized SPH program. The high velocity impact model of an aluminum bar has been analysed by using the developed program and a commercial hydrocode, LS-DYNA. The obtained numerical results showed good agreement with the results of the same model in reference. The program also showed more stable results than those of LS-DYNA in stress oscillation. We hopefully expect that the developed one-dimensional normalized SPH program can be used to solve hydrodynamic problems especially for explosive detonation analysis.

• Proceedings of the KIEE Conference
• /
• 2005.05a
• /
• pp.54-56
• /
• 2005

Analysis of the voice and its corresponding studies are examined from the recording of the voice through microphone and various calculation processes of the signals by using computer. Voice analyser include data acquisition and analyzing program. Since oath program uses different voice signal processing algorithm, thorough understanding of the operation is essential. In this study, analysis result of patient voice were compared by using four different voice analysis programs such as MDVP, Praat, TF32, and the program developed in this study. Pitch, jitter and shimmer were selected as comparison analysis factors. As a result, pitch, jitter and shimmer showed different result since each program uses different pitch computation algorithm.

• 한국전산유체공학회:학술대회논문집
• /
• 2010.05a
• /
• pp.524-529
• /
• 2010

In the present study, a CFD program is developed for the Fluid-Structure Interaction(FSI) analysis. The non-staggered, non-orthogonal, and unstructured grid system was also used to handle the complicated geometries in the program. In order to validate the capabilities of the developed CFD program, various models are investigated by using unstructured and nonorthogonal meshes. The predicted results are a good agreement with analytic solution, experimental data and commercial software. And also PISO algorithm is applied for transient flow analysis. The cyclic boundary condition and baffle cell are developed in order to improve the effectiveness of the calculation for complex geometry.

• 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.

• Proceedings of the Ginseng society Conference
• /
• 1998.06a
• /
• pp.138-145
• /
• 1998

A validated and reproducible HPLC method was developed for the profiling and quantitative analysis of ginsenosides in commercial products available in North America. Analysis of 280 Panax ginseng and Panax quinquefolius products showed profiles indicative of the presence of ginsenosides in the majority of these products. However, the quantitative contents of the products vary greatly, not only in products of different formulations, but also of products within each of the fromulations examined.