• Journal of the Korean Society for Aviation and Aeronautics
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• v.24 no.3
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• pp.55-61
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• 2016

Among the method of aerial fire firefighting, the indirect attack is efficiency way to protect main facilities and it is the aerial fire line construction. According to this study is suggested the fire line construction strategy of indirect attack by helicopter suitable Korea forest fire on theory consideration of indirect attack and experience in practical scene. This study defined that main key points of the fire line construction are accuracy, large quantity, and quickness. Main protection facilities are devided as caution area, warning area, danger area and concern area. Also, it suggested stage-by-stsge from 1 step to 3 step for the aerial fire firefighting correspondence strategy and the fire line construction model. I regard that this study's indirect attack method of the aerial fire firefighting of the fire line construction may be understand about indirect attack tactics and application of indirect attack which is assistance to raise of capability of the aerial fire firefighting with effectiveness and efficiency.

• Korean Journal of Computational Design and Engineering
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• v.3 no.2
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• pp.87-102
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• 1998

Given a sequence of cross-sectional curves, the skinning method generates a freeform surface that interpolates the given curves in that sequence. This thesis presents a construction method of a B-spline skinning surface that is fair and satisfies volume constraints. The fairness metric is based on the parametric energy functional of a surface. The degrees of freedom in surface control are closely related lo control points in the skinning direction. The algorithm fur finding a skinning surface consists of two step. In the first step, an initial fair surface is generated without volume constraints and one coordinate of each control point is fixed. In the second step, a final surface that meets all constraints is constucted by rearranging the other coordinates of each control point that defines the initial surface A variational Lagrange optimization method produces a system of nonlinear equations, which can be solved numerically. Moreover, the reparametrization of given sectional curves is important for the construction of a reasonable skinning surface. This thesis also presents an intuitive metric for reparametrization and gives some examples that are optimized with respect to that metric.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.8 no.4
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• pp.269-273
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• 1996

A new type of perforated block is presented to be used in the construction of a step seawall. Two-dimensional hydraulic model test is performed to compare the overtopping rates between the traditional non-perforated step seawall and the perforated step seawall constructed with the new type of perforated blocks. The overtopping rate of the perforated step seawall is lower than that of the traditional non-perforated step seawall. The new type of perforated step seawall may be used as an alternative for water-amenity seawall in the future.

• Structural Engineering and Mechanics
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• v.15 no.1
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• pp.71-81
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• 2003

The governing differential equation for buckling of a one-step bar with the effect of shear deformation is established and its exact solution is obtained. Then, the exact solution is used to derive the eigenvalue equation of a multi-step bar. The new exact approach combining the transfer matrix method and the closed form solution of one step bar is presented. The proposed methods is convenient for solving the entire and partial buckling of one-step and multi-step bars with various end conditions, with or without shear deformation effect, subjected to concentrated axial loads. A numerical example is given explaining the proposed procedure and investigating the effect of shear deformation on the critical buckling force of a multi-step bar.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.464-467
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• 2002

In Korea construction project case, architectural construction project is curtailed production because information network process within multidisciplinary isn't smooth. Particularly, the construction is not insufficient about performance, cost and material, construction process, etc. in result various question arises because of design error in construction step. And various mistake is made because communication path within multidisciplinary isn't smooth in architectural design and design change process. This research proposed the optimization method of building system which is satisfied with performance of building, cost, constructability, and proposed the information management plan which is connected with that. And The construction information in this research is restricted to design/construction information which is considerate in design step.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.1242-1247
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• 2009

This study presents limitations for the roles and the responsibilities of the related business entities because it is very important that the controversy is minimized during a progressive period of the project. In this study, we analyze several Ubiquitous city projects undertaken by the local governments and raised some issues. We construct the step-by-step procedures for the Ubiquitous city construction business management from the business plan to management after completion of the Ubiquitous city construction and establish the clear-cut duty ranges for the related business entities at each step.

• Korean Journal of Computational Design and Engineering
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• v.9 no.4
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• pp.315-324
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• 2004

The purpose of this study is to suggest the way of automatic building code checking for architectural drawings in the web environment to enhance the utility of CALS/EC standard drawings and efficiency of construction industry business. To fulfil this aim, the authors seek to standardize the architectural drawing automatic checking system by linked drawing information to the STEP based CALS/EC standard format. Therefore, the automatic building code checking system can represent a way of utilizing the relationship between the construction CALS/EC standard drawings and the related study as well as improve the efficient of the construction work by sharing a variety of drawing information.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.453-458
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• 2004

This study proposes a new two-level condensation scheme for the construction of a reduced system. In the first step, the candidate area is selected for the construction of the reduced system by energy estimation in element-level. In the second step, primary degrees of freedom are selected by sequential elimination from the candidate degrees of freedom linked to the selected elements. Numerical examples demonstrate that the proposed method saves the computational cost effectively and provides a reduced system which predicts the eigenvalues accurately. Moreover, the well-constructed reduced system can present the reliable behavior of the structure under arbitrary dynamic loads comparing to that of global system. Time integration in a reduced system can save the computing time remarkably. Through a few numerical examples, the efficiency and reliability of the proposed scheme are verified.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.317-318
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• 2012

Although installations and usages of gang-form that has advantages of preventing fall disaster, the serious disasters from gang-form occur every year. This research focused on the continuous prevention of disasters in construction of outer wall of apartment working site through step by step safety management worker's checking table. The result is the worker's checking table for safety management in apartment gang-form works, through safety guidelines case studies, interviews with safety management experts and then extracting a check list.

• Journal of the Korean Institute of Rural Architecture
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• v.16 no.1
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• pp.27-34
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• 2014

This study is to understand fallible point on the step of design, construction and management, and suggest an improvement measure for the convenience of elderly through the field survey. The field survey on convenience facilities for the disabled of Senior Welfare Center in Chung-Buk Area was performed on approach to main entrance, parking lot, main entrance area, entrance door, passage, stair, elevator and toilet. It was discussed that barrier free design should be considered of main user's group and use pattern. Consequently, important points requiring circumspection at the step of design and construction was suggested.