• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3371-3376
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• 2007

The design of a ground-source heat pump system includes specifications for a ground loop heat exchanger where the heat transfer rate depends on the thermal conductivity of the ground. To evaluate this heat transfer property, in-situ thermal response tests on four vertical test boreholes with different grouting materials were conducted by adding a monitored amount of heat to water over various test lengths. By measuring the water temperatures entering and exiting the loop, water flow rate, and heat load, effective thermal conductivity values of the ground were determined. The effect of increasing thermal conductivity of grouting materials from 0.82 to 1.05 W/m$^{\circ}C$ resulted in overall increases in effective ground thermal conductivity by 25.8% to 69.5%.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2713-2718
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• 2003

Some of manufacturing tasks such as sawing task often requires continuous impulsive motion. In case of sawing task, such impulsive motions can be observed between the teeth of the saw and the object. The amount of the external impulse exerted on the object has been treated as an important control parameter. The purpose of this work is to introduce a new concept of an effective mass in sawing task and to suggest an external impulse model in sawing task. A normalized impulse ellipsoid reflecting the velocity direction is employed to visualize the impact geometry. Experiments are performed for soft and hard workpieces to justify the external impulse model in the sawing task. It is demonstrated through simulation and experiment that the proposed external impulse model is effective to characterize the impact property.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.1
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• pp.45-54
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• 2020

One of the typical characteristics of smart media is that it is interactive, which shows a different form and property from the existing mass media, and also changes the way users use it. This change requires a different system from the existing method in the advertising process strategic model for effective interactive advertising in smart media. We attempted to derive an effective smart media interactive advertising process strategic model by understanding the interactive advertising processin smart media that is expected to continue to grow asthe main market of the advertising market and identifying the constituent factors. To this end, We analyzed the preminiary research results of interactive advertising and organized expert panels for the Delphi method and reflected their opinions and evaluations. The components and factors of interactive advertising were found and the effective interactive advertising process strategy model in smart media was derived from this study.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.9
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• pp.713-719
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• 2008

Most of the MEMS parts are made of multi-grain silicon wafer, which is the orthotropic material and its material direction is arbitrary. The reliability of the parts must be guaranteed in order to use for the commercial usage. The need of the structural analysis of its parts emerges an important factor. The material properties of the MEMS parts are calculated by the numerical method in order to reduce a material test. In this study, the effective elastic modulus and its Poisson's ratio are calculated by the boundary element method(BEM) and are compared with the results by the finite element method(FEM).

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2001.10a
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• pp.175-182
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• 2001

Effective length factor approach for framed column design has long played an important design-aid role. This approach, however, is effective only when the columns are in the form of prismatic or uniform cross sections. Structural engineers who have to design or analyse framed columns with variable cross sections need some means to do their job. By using the finite element method, the stability analysis of the isolated compression members with variable cross sections and that of the framed columns are performed. The parameters considered in the stability analysis are taper and sectional property parameters of the columns, the second moment of inertia ratio of beam to column, and beam span to column height ratio. On the basis of the stability analysis results, effective length factor formulas for the columns with variable sections are derived.

• Bulletin of the Korean Chemical Society
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• v.9 no.2
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• pp.101-105
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• 1988

The ab initio effective valence shell Hamiltonian method, based on quasidegenerate many-body perturbation theory, is generalized to calculate molecular properties as well as the valence state energies which have previously been determined for atoms and small molecules. The procedure requires the evaluation of effective operator for each molecular property. Effective operators are perturbatively expanded in powers of correlation and contain contributions from excitations outside of the multireference valence space. To demonstrate the validity of this method, calculations for dipole moments of several low lying valence states of OH, $OH^+$, and $OH^-$ to first order in the correlations have been performed and compared with configuration interaction calculations.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.3
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• pp.402-405
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• 2012

In this paper, we proposed a novel metamaterial unit cell utilizing an interdigital capacitor(IDC) with non-bianisotropic property. Due to the induced magnetic resonance of an IDC unit cell, exotic effective constitutive parameters can be realized like a split ring resonator(SRR). Furthermore, the proposed unit cell is electrically smaller than a conventional SRR unit cell. The effective parameters retrieved from the transmission responses of waveguide measurement method and simulated results show good agreement.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.4
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• pp.455-467
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• 2001

In this study, the stacking phase shift effect on the effective property and stress distribution was investigated for 8-harness satin weave textile composites under uni-axial tension. Textile configurations with varied phase shifts were modeled by unit cells and repeating boundary conditions were applied at the outer periodic surfaces. The effective property and stress were calculated by the unit cell analysis using macro-element to reduce the computational resource. It was found that stresses were dependent on the variation of tow arrangement of adjacent layers. The in-phase and the shifted configurations showed large differences in the stress distribution pattern. The stress level was very high in the resin region and the distribution of the maximum stresses was widely scattered.

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.5
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• pp.17-23
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• 2007

This study aims to investigate the property of engine performance and the material property of exhaust gas by application of the intake swirler The fuel of BDF 20 was made by mixing 80% of diesel fuel and 20% of biodiesel fuel. These fuels were used and tested in the diesel engine of CRDI type used currently. The swirler was made by streamlined shape to lessen the intake resistance, The three types of its wing angle are $20^{\circ}$, $40^{\circ}$ and $60^{\circ}$. From experimental results, we found that the characteristics of engine performance, soot was effective in wing angle of $20^{\circ}$ and NOx was effective in $60^{\circ}$.

• Korean Institute of Interior Design Journal
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• v.23 no.3
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• pp.134-143
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• 2014

The protection of Design is very important issues in these days. Even though Interior Design is also one of important design sections, it is relatively unprotected by formal intellectual property laws, yet creativity and innovation flourish. The needs for protection of Interior Design have been creased. The aim of this study is to suggest the weakness of the system for protection of Interior Design. The proposed research is comprised of two themes. One is to research Acts related to protection of Interior Design. The second is to study the registered cases under the Design Protection Acts. These two theme is generated by the comparative review between ROK and U.S.A. Through these comparative results, this study propose some considerations for an effective protection for Interior Design. Design need to be registered in the hole image of the space not a partial element. The concept needs to be protected because it is more effective way to respond the copying. Exterior for facade and Interior Design need to be registered in one registration to use the protection system actively.