• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.578-582
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• 2008

The domestic construction companies have implemented a various of management methodology and tools for time management. However, the work completion rate versus work plan have a big difference with the planned work completion rate previously despite of implementing the time management methodology and tools. The research searches the problems that the previous time management process and tools focusing on the management factors that can be controlled. Also, It suggest the improvement direction for these limits.

• Transactions of the Korean Society of Automotive Engineers
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• v.13 no.6
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• pp.93-98
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• 2005

The purpose of this study is to confirm the improvement of formability of AZ31 magnesium alloy sheet by using local heating and cooling technique. For this, the experiments of warm deep drawing were done under the temperatures of $100^{\circ}C\~400^{\circ}C$, and the punch velocity of 10, 100mm/min. Also FE analysis under the temperatures of blankholder and die of $150^{\circ}C,\;225^{\circ}C\;and\;300^{\circ}C$ for tools(holder and die) was executed with considering heat teansfer. From the results, the formability of AZ31 magnesium alloy, espicially the temperatures of $225^{\circ}C\~250^{\circ}C$ for tools(holder and die)improved remarkably. And the experiments and simulations showed that necking under room temperature for tools occured under the part of punch shoulder while at $300^{\circ}C$ for tools, at the part of die shoulder.

• IE interfaces
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• v.16 no.1
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• pp.8-15
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• 2003

With rapid growth of internet technology, companies have developed an information system such as the electronic catalog for product data in the E-Business. Due to the heuristic nature of the catalog search for proper tools in the specific process, the intelligent and user friendly methods residing in the search process give a comfortable environment even for the beginners in the field. In this paper, we develop a web based catalog for machining tools especially in Milling process. It has two distinct procedures for the users of the catalog; Search and Analysis. The Search is to select a proper cutter, insert, component combination in the developed relational database based on the cutting process and material. The Analysis is to suggest a recommended optimal cutting conditions based on the machining tools and selected materials. All of these procedures are stored in a server with a program based on the ASP and Java Script where the procedure is initiated by the client using the internet which is accessed through insert. With the success on implementing the above engineering database in the internet, we can provide the foundation for developing PDM with heuristic procedure.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.1
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• pp.120-128
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• 2000

One of the major limitations of productivity and quality in metal cutting is the machining accuracy of machine tools. The machining accuracy is affected by geometric errors, thermally-induced errors, and the deterioration of the machine tools. Geometric and thermal errors of machine tools should be measured and compensated to manufacture high quality products. In metal cutting, the machining accuracy is more affected by thermal errors than by geometric errors. This paper models of the thermal errors for error analysis and develops on-the-machine measurement system by which the volumetric error are measured and compensated. The thermal error is modeled by means of angularity errors of a column and thermal drift error of the spindle unit which are measured by the touch probe unit with a star type styluses and a designed spherical ball artifact (SBA). Experiments, performed with the developed measurement system, show that the system provides a high measuring accuracy, with repeatability of $\pm$2${\mu}{\textrm}{m}$ in X, Y and Z directions. It is believed that the developed measurement system can be also applied to the machine tools with CNC controller. In addition, machining accuracy and product quality can be improved by using the developed measurement system when the spherical ball artifact is mounted on the modular fixture.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.10
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• pp.1717-1722
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• 2008

A number of tools and equipment can measure the degree of stress. Stress measurement includes both psychological and physiological measurements. Considering only one of these elicits subjective or objective deficiency. Overcoming this problem requires a new stress index that combines these two measurements. Following people's personal traits, the measurement results also appear in diverse ways, but we can consider and study the general case obtained on the basis of the measurement tool. By using the index obtained by the psychological and physiological measurement tools, we obtain an integrated stress index. Therefore, we choose to use four stress measurement tools. The index of the result of each measurement tools is referred to as the multi-index. These indices are plotted on coordinates to analyze and diagnose the balance and tendency of the stress.

• Journal of the Korean Society of Safety
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• v.37 no.3
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• pp.60-70
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• 2022

The use rate of sports facilities in Korea is increasing every year, which means that accidents are also increasing. However, it is difficult to determine the level of safety management necessary to prevent accidents because there are no measurement tools to evaluate such management of sports facilities. Accordingly, in this study, tools and models to evaluate the safety management level of public sports facilities were developed based on public company management evaluation guidelines and the EFQM Excellence Model. A comparative analysis of the proposed tools and models between local governments showed no difference in awareness of safety management by group. This means that active safety management activities are needed to improve the low level of interest in safety of public sports facilities. We hope that this model will be widely used for the safety management of public sports facilities and to identify improvements and priorities in safety management.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.79-80
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• 2012

• Journal of the Korean institute of surface engineering
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• v.31 no.6
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• pp.400-406
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• 1998

Tool life characteristics were investigated for the TiN coated (PVD) tungsten carbide cutting tools to improve the tool life Experimental variables for Tin coating were coating time and cathode bias voltage and cuting variables were cutting speed and feel rate. As a experiment result, TiN coated tool was extended about from 2.14 to 2.7 times than that of not coated tungsten carbide tools. Also, coating thinkness is much affected to tool life.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.41-42
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• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.720-723
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• 1995

As a part of the configuration design expert system of machine tools, inference mechanisms are constructed in this paper. In addition to procedural inference, the method of multivariable inference is considered as an efficient approach to deal with the cases of highly coupled condition. We propose a generalized multivariable inference procedure. The procedure is applied to the type selection module of the configuration design expert system of machine tools in order to demonstrate the efficiency and validity.