• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.7 no.5
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• pp.127-133
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• 1998

This research intends to gain the sight for the qualitative characteristics of precision cutting by using the CNC lathe with a mono-crystal diamond(MCD) and a poly-crystal diamond(PCD) tool on the cutting distance. In case of an MCD tool, as the cutting distance increases, the surface roughness becomes worse and the standard deviation of surface roughness is small. In case of a PCD tool, as the cutting distance increases, the surface roughness becomes stable with a large standard deviation. The cutting force ratio(Ft/Fn) decreases as the nose radius increases and the decreasing ratio becomes larger for small nose radius.

• Journal of Engineering Education Research
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• v.19 no.2
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• pp.70-75
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• 2016

This paper deals with a result of case study for the development of CEA(Course-Embedded Assessment) design tool for engineering education accreditation implementing programs. Many programs have been devoting efforts to apply CEA to their engineering education. In order to effectively apply the CEA to educational program, it is required to develop the standardized form or scheme for CEA application. As a preliminary approach, we propose the design tool and the result of a case study for CEA application in engineering education.

• Journal of the Korea Institute of Military Science and Technology
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• v.6 no.3
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• pp.22-35
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• 2003

This paper describes system technical requirement development process from operational concept using computer-aided Systems Engineering tool(CASysE Tool-CORE). The army tactical missile system-ATACMS's technical requirements are developed by the process as a case-study The scope of the work is context analysis and requirement definition process. The proposed process is as follows. At first, an integrated architecture could be developed from the operational concept. From the integrated architecture a capability needs, which includes KPPs, are generated. And the capability needs expanded according to the Mil-Std-961D format. Lastly, a system technical requirement could be generated automatically from the CASysE Tool-CORE.

• The Journal of Society for e-Business Studies
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• v.9 no.1
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• pp.1-19
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• 2004

The systematic testing is frequently regretted in recent web applications because of time and cost pressure. Moreover developers have difficulties with applying the traditional testing techniques to testing web application. The approach of creating test cases for a web application from a sequence model is proposed for the rapid and efficient testing. Test cases for web application are extracted from call messages (including self-call messages) of UML (Unified Modeling Language) sequence diagram. A test case consists of messages, script functions, or server pages and additional values. Moreover a simple testing tool for web application is proposed. A URL for testing web application is created and executed by this testing tool. The URL consists of server page address and additional values. This test tool is made using Microsoft Visual Basic. The efficiency of proposed method and tool has been shown using a practical case study which reflects the development project of the web application for supporting member management.

• The Transactions of the Korea Information Processing Society
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• v.7 no.1
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• pp.20-28
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• 2000

In distributed data processing environments, heterogeneous data sources should corporate each other. The CORBA standards proposed by OMG solve this problem by the integration of platform independent applications. In this paper, we design and implement a CASE tool that help linking CORBA applications to relational databases by interface method. This CASE tool manipulates the database schema and generates IDL and $C^{++}$ stubs corresponding to the schema. We explain the code generation process and evaluate the data access performance of the interface method compared to adapter method and various implementation languages. The implemented tool can be used for developing applications that need relational database corporation environments such as distributed information systems or data warehousing. etc.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2007.05a
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• pp.42-47
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• 2007

The characteristics of the tool system give many effects into the costs and qualities for the finished components. Therefore, a tool life is one of the important issues on cold forging industry. However, since variables related with tool life are many complicated, the studies for solution should be investigated by the systematic research approach. The shape and process changes of die, the hardness changes of material and the tolerance of dies to decrease the die stress are analyzed by the FEM software. The heat-treatment of tool material is investigated to improve the tool life. Deep cryogenic treatment of tool steel is very efficient to improve the wear resistance due to the fine carbide. And, it is investigated that the shape and dimension of tool give effect into both tool life and quality of forged product..

• Journal of Computational Design and Engineering
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• v.2 no.4
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• pp.197-205
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• 2015

Bladed disk (BLISK) is a vital part in jet engines with a complicated shape which is exclusively machined on a five-axis machine and requires high accuracy of machining. Poor quality of tool orientation (e.g., false tool positioning and unsmooth tool orientation transition) during the five-axis machining may cause collision and machine vibration, which will debase the machining quality and in the worst case sabotage the BLISK. This paper presents a reference plane based algorithm to generate a set of smoothly aligned tool orientations along a tool path. The proposed method guarantees that no collision would occur anywhere along the tool path, and the overall smoothness is globally optimized. A preliminary simulation verification of the proposed algorithm is conducted on a BLISK model and the tool orientation generated is found to be stable, smooth, and well-formed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.05a
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• pp.898-901
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• 2000

In this paper, the theoretical tool displacement and surface roughness are analyzed based on the tool locus of a 2-dimensional tool vibrator. At first, the effects assuming no structural deformation of such variables as frequency, amplitude and phase difference that determine tool loci are simulated. The results show that larger amplitude and/or higher frequency makes better surface. However, a real tool vibrator has the structural deformation, much or less, depending on the excitation frequency. Applying FEM analysis to the deformation of a designed 2D tool vibrator according to the excitation, it has been proved that in this case the displacement is 5${\mu}{\textrm}{m}$ at 1KHz and almost 0 at 20KHz even under the same excitation amplitude.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.179-181
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• 1998

공간 정보를 저장하고 관리하여 분석과 응용을 할 수 있게 해주는 공간 데이터는 그 제작 기관에 따라 모델링 방법과 포맷이 서로 다르다. 이처럼 서로 다른 형식의 데이터들 간의 상호 변환이 필요함에 따라 공간 데이터 변환을 위한 표준안들이 제시되었고 우리나라에서는 교환 표준으로 SDTS를 채택하였다. 하지만 사용자의 데이터 포맷을 SDTS 교환 포맷으로 바꾸어 ISO8211 파일로 전환하는 작업은 많은 노력과 시간을 필요로 한다. 따라서 본 논문은 다양한 사용자의 데이터 포맷과 SDTS 교환 포맷 사이에 쉽게 변환해 줄 수 있는 응용 프로그램을 설계하고 구현하고자 한다.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1998.04a
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• pp.292-299
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• 1998

Case hardening behavior of tool steel(SK5) was investigated after YAG laser irradiation. In the case of beam passes, martensite formed in the melt zone and in former pearlite regions of the austenization zone exhibited very high Vickers Hardness values. The molten depth and radius, micro structure, hardness were investigated as a function of defocusing distance, pulse width, and power density.