• Journal of the Society of Naval Architects of Korea
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• v.32 no.4
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• pp.48-54
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• 1995

A new propeller open water testing device is developed and tested in a tow tank. The devised dynamometer consists of a torque measuring part, a thrust measuring part and a driving motor with an RPM counter. Torque is designed to be measured directly from the torsion of the structure holding the motor by using strain gauges and, consequently, conventional slip ring is removed. Also, in order to make the device fit in relatively small model ships, the weight and the size of the whole integrated structure are reduced in various ways. The developed tester is proved to be easily utilized in small circulating water channel experiments and is believed to have provided us with essential information for future design of various types of conventional or object oriented force measuring device.

• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.2
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• pp.9-22
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• 2008

This paper presents an integrated optimal design technique of a hybrid structure-damper system for improving the seismic performance of the structure. The proposed technique corresponds to the optimal distribution of the stiffness and dampers. The multi-objective optimization technique is introduced to deal with the optimal design problem of the hybrid system, which is reformulated into the multi-objective optimization problem with a constraint of target reliability in an efficient manner. An illustrative example shows that the proposed technique can provide a set of Pareto optimal solutions embracing the solutions obtained by the conventional sequential design method and single-objective optimization method based on weighted summation scheme. Based on the stiffness and damping capacities, three representative designs are selected among the Pareto optimal solutions and their seismic performances are investigated through the parametric studies on the dynamic characteristics of the seismic events. The comparative results demonstrate that the proposed approach can be efficiently applied to the optimal design problem for improving the seismic performance of the structure.

• Journal of the Korean Association of Geographic Information Studies
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• v.11 no.3
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• pp.127-135
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• 2008

Intermodal or transfer facilities is always necessary wherever different modes meet at one place and exchanges of passengers among the modes take place. Design of intermodal or transfer facilities requires a careful consideration of numerous legal and technical factors. This study intends to suggest the fundamental principles needed for design the intermodal facilities to enhance the level-of-service for transfer passengers as well as the efficiency of operation. Previous studies and relevant legal documentation are reviewed and examined. Steps in the design procedures are suggested, and data necessary for designing the facility is suggested. The above principles are applied to the real design of Busan KTX station in order to identify the problems.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.5
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• pp.367-379
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• 2022

In this paper, a multilayer radar absorbing structure was designed using the Particle Swarm Optimization (PSO) algorithm, and the characteristics of the multilayer radar absorbing structure were analyzed. It was shown that design values can be derived quickly and accurately by applying PSO to the design of a multilayer radar absorbing structure, and it is also shown that the optimal multilayer radar absorbing structure can be designed especially for an oblique incident. In addition, it was shown that the optimal value that meets the performance requirements can be determined even in a combination of various design parameters. It is presented through a comprehensive flowchart including the equations and detailed descriptions of all variables for each step. From the results of this paper, it is possible to omit complex and many calculations for designing a multilayer radar absorbing structure, and it is possible to use various composite materials. It can be utilized in the design and development of multilayer radar absorbing structures.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.6
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• pp.1412-1422
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• 1993

As a part of development of process planning system for mold die manufaturing, a software system is developed, which recognizes features and extracts parameters of the shape from design data produced by solid modeller. The recognized feature date is fed to process planning and operation planning system. Low level geometry and topology data from commercial CAD system is transformed to high level machining feature data which used to be done by using a dedicated design system. The recognition algorithm is applied to the design data with boundary representation produced by a core modeller ACIS which has object oriented open architecture and is expected to become a common core modeller of next generation CAD system. The algoritm of recognition has been formulated for 21 features on prismatic components, but the feature set can be expanded by adding rules for the additional features.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.3 no.4
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• pp.1-10
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• 1983

The deformation and crack width of concrete walls of slabs, plates, panels and shells reinforced by a regular rectangular net of reinforcing bars and subjected to in-plane (membrane) internal forces is analyzed on the basis of a realistic model which takes into account the frictional-dilatant behavior of rough interlocked cracks, the effect of tension stiffening, and the dowel action of bars at crack crossings. Extensive numerical computer studies are carried out, and the reinforcement designs obtained from equilibrium conditions alone on the basis of either the classical frictionless approach or the recent frictional approach are compared in terms of the resulting crack widths. It is found that the use of frictional equilibrium design based on a low friction coefficient leads to a much smaller crack width than the classical frictionless design. The influences of bar diameter and crack spacing on the crack width are also studied. The model allows more realistic deformation analysis of reinforced concrete structures.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.33 no.6
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• pp.268-275
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• 2023

This paper delves into the crucial realm of support structures in metal additive manufacturing (AM) processes and their direct impact on the stiffness of printed components. With the continuous evolution of AM technologies, optimizing support structures has become imperative to enhance the overall quality and performance of manufactured metal parts. Therefore, in this study, tensile specimens were manufactured using various representative support design variables such as support type, spacing, and penetration depth, and the differences in displacement-load curve were analyzed though tensile test. Using additively manufactured support shaped tensile specimen, the paper presents a comprehensive examination of the effect of support parameters on their stiffness. The findings contribute to advancing the understanding how to design supports to suppress thermal deformation of metal parts during AM process, thereby paving the way for enhanced design freedom and functional performance in the ever-expanding field of AM.

• The Korean Journal of Archival Studies
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• no.46
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• pp.189-231
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• 2015

This study is for establishing an appraisal methodology to ensure the accountability of the parliament and to documentation the contemporary historical events related to the National Assembly. It is impossible to documentation comprehensively the activities of the National Assembly through the records schedule of the National Assembly, the current the disposal guidelines of the National Assembly. In particular, this is designed focusing on four affiliated organizations such as the National Assembly Secretariat, so there is a fundamental limit to documentation the outputs of various external agencies and areas where have relationships with the National Assembly. Therefore, it is hard to documentation comprehensively the various issues and historical events occurring in the National Assembly under the current appraisal system. In this situation, this study presents the appraisal methodology, the institutional functional analysis to ensure the accountability of the institution as a first step. However, only with the institutional functional analysis methodology, it is difficult to organize collectively the contemporary historical events or social events ongoing in relation to the fundamental functions of the National Assembly. For this reason, the subject oriented documentation methodology is designed that is the appraisal methodology of selecting the records related to the contemporary social phenomena and historical events according to the functional areas of the National Assembly derived from the institutional functional analysis methodology. Thereby, it is designed that the model of the documentation strategy applicable to the National Assembly in reality.

• Journal of the Korean Society for information Management
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• v.24 no.3
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• pp.43-65
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• 2007

Automatic recommendation system of panel pool should be designed to support universal, expertness, fairness, and reasonableness in the process of review of proposals. In this research, we apply the theory of probabilistic ontology to measure relatedness between terms in the classification of academic domain, enlarge the number of review candidates, and rank recommendable reviewers according to their expertness. In addition, we construct a researcher network connecting among researchers according to their various relationships like mentor, coauthor, and cooperative research. We use the researcher network to exclude inappropriate reviewers and support fairness of reviewer recommendation process. Our methodology recommending proper reviewers is verified from experts in the field of proposal examination. It propose the proper method for developing a resonable reviewer recommendation system.

• The Korean Journal of Archival Studies
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• no.52
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• pp.39-58
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• 2017

It is the responsibility of the government organization in the field of history and archives to control preproduction of records and their production sphere. Moreover, it should also manage all kinds of archives and presidential records as its function is to manage and share public information, and carry out compilations of historical records. With this, this study explains how having all these functions would make the ideal reorganization of the government. It should correspond to principle of Government's reorganization such as transparency, responsibility, communication. A plan for reformation needs two-track approach. I would like to propose the establishment of the 'Ministry of National Archives' or the 'National Memory Committee' at the organization that is in charge of national records and memory management. It means that the National memory isn't limited to public sphere. In terms of Total archives, the organizations should contain the whole community's memory. This organization should be formed independently.