• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.1070-1072
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• 2003

In this paper, Firstly, it is shown that the high vibration source of piping system is the pulsation transmission of pipe line element ,such as, orifice plate, valves and the control valve is a broad band source and the branch wall and the cavity have vortex frequency Secondly, in order to decrese the turbulence vibration of piping system, the practical analysis of piping flow by EFD have been developed and its effectiveness is investigated as applying it at piping system practically.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.184-190
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• 2003

In this study, several methods for measuring floor impact sound were introduced. Among them, the simple methods (impedance method and diffuse index method) which can be easily applied to site works were investigated. Moreover, the comparison between the calculation results using diffuse index method and the experimental results measured in real apartment structures was conducted. Consequently, the modified diffuse index method, which can be practically used for predicting the performance of to the floor impact sound of apartment structures and can meet the allowable tolerance of Grade I (${\pm}$5㏈), was proposed.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.10b
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• pp.897-902
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• 2000

In most of large panel pre-cast concrete system, the narrow joints have inefficiency to assemble several panels and structural problems due to their complicated process after construction. To improve, practically, structural performance and inefficiency to assemble, the behavior and strength of new wide joints method should be investigated experimentally. The result is that the shear force of wide joints is similar to that of loop joints, or more than. It seems that the use of wide joints is the possible methods in a construction field.

• IE interfaces
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• v.9 no.1
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• pp.73-82
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• 1996

The purpose of this research is to construct real-time image acquisition system for a line-scan inspection system as a computer vision system. To construct the line-scan inspection system, many problem arise. However, problems of image acquisitions using linear CCD are practically studied in this paper. These problems are concerned to proper lighting systems, relations with handling system, camera systems, and impacts due to the noise of environment. These problems are examined separately, and proper configurations for each case are suggested to construct the line-scan image acquisition system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.7 no.2
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• pp.66-70
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• 1982

A data communication protocol and interface between a minicomputer and remote microprocessor-based real-time controllers are proposed and designed. Practically this method was implemented on a real-time data acquisition and on-line control system with a good performance.

• Journal of the Korean Institute of Educational Facilities
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• v.3 no.1
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• pp.31-38
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• 1996

In this thesis, we will theoratically and practically study and analyze how the heat flows through an opaque wall, which is by the new material insulated, of a school building in Korea. It will be an important information for the effective using guidelines of the new light throughable insulation materials in Korea.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1998.10a
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• pp.258-265
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• 1998

Seismic isolation has developed to the point where it may be considered as a viable design alternate for a wide range of building structures. However, it needs to consider various aspects to adopt a suitable isolation system for buildings practically. This report presents the basis for the preliminary design procedure which has been developed for the seismic isolation system using the lead rubber bearings. The design procedures have been developed to ensure that the bearings will safely support the maximum gravity load throughout the life of the structure while they provide a period shift and hysteretic damping during the design earthquake.

• Structural Engineering and Mechanics
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• v.4 no.6
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• pp.717-729
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• 1996

This paper presents the concepts of Process Innovation and Concurrent Engineering in view of their use within Integrated CAD Systems. It follows by proposing process models that support an effective implementation. The work is practically founded on the authors' experience in performing the initial steps of implementation of some of such integrated systems for the construction industry.

• Journal of Magnetics
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• v.3 no.1
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• pp.15-20
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• 1998

A newly designed magnetic annealing apparatus was used for the treatment of Fe-3%Si steels. With the help of this device, the effect of magnetic annealing on magnetostriction was studied in a wide spectrum of external elastic stresses. It was shown that magnetostriction properties of Fe-Si steels were improved in the compressed state through magnetic annealing, while those in the unstressed state or under tensiion were found to be practically unchanged.

• ETRI Journal
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• v.31 no.2
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• pp.140-150
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• 2009

Although mutation testing is potentially powerful, it is a computationally expensive testing method. To investigate how we can reduce the cost of object-oriented mutation testing, we have conducted empirical studies on class mutation operators. We applied class mutation operators to 866 classes contained in six open-source programs. An analysis of the number and the distribution of class mutants generated and preliminary data on the effectiveness of some operators are provided. Our study shows that the overall number of class mutants is smaller than for traditional mutants, which offers the possibility that class mutation can be made practically affordable.