• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.4
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• pp.460-466
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• 2018

With the development of information technology, the scale of computer software system is constantly expanding. Reliability and cost of software development have a great impact on software quality. In this study, based on the software failure interval time data, a comparative analysis was performed on the characteristics of the software development cost model based on the lifetime distribution following the Type-2 Gumbel and Erlang distribution in the NHPP model. As a result, the trends of the cost curves for the Go-Okumoto model and the proposed Erlang model and the Type-2 Gumble model both decreased in the initial stage and gradually increased in the latter half of the failure time. Also, Comparing the Erlang model with the Type-2 Gumble model, we found that the Erlang model is faster and more cost-effective at launch. Through this study, Software operators should remove possible defects from the testing phase rather than the operational phase to reduce defects after the software release date, it is expected to be able to study the prior information needed to understand the characteristic of software development cost.

• Journal of Korean Society of Rural Planning
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• v.15 no.4
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• pp.161-172
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• 2009

This study focuses on the application of landscape planning(i.e. including rural landscape character area designation and rural landscape planning etc.). That application of landscape planning provides the probably most operable and comprehensive version of what is generally accepted by the discipline. According to the planning discipline the schemes of planning are to; Firstly, we derived the improvement of landscape and the methods of landscape characterization subsequent to analyze the present condition and grasp the landscape resources in Yesan via reviewing the current study and field survey. Secondly, in order to achieve environmentally friendly rural landscape plan and characteristic rural landscape creation, we planed the draft landscape area such as woodland, hydrology area, urbanized area, rural communities, etc. which was classified by sphere of life moreover, we planed partly outdoor facilities, road and colour suchlike. Thirdly, we tried to seek the programme of conservation and utilization for scenic and characteristic rural landscape area via rural landscape character area designation. Lastly, it is proposed that rural landscape planning lead to inhabitant participation, system improvement, subject performance for carrying out efficient rural landscape planning.

• Journal of Powder Materials
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• v.20 no.3
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• pp.215-220
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• 2013

In the present work, 6061 Al-$B_4C$ sintered composites containing different $B_4C$ contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with $B_4C$ various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to $660^{\circ}C$. Above sintering temperature of $640^{\circ}C$, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-$B_4C$ composite material was lowered with increasing $B_4C$ content, resulting in the decrease in its real density and at the same time in the increment of porosity.

• Journal of the Korean Institute of Rural Architecture
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• v.13 no.1
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• pp.63-70
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• 2011

This study is about characteristic of rural areas development project considering Rural Areas Migration. As a Rural Economy is getting worse for a rapid decrease in population and a rapid aging of the population, Decline in Rural areas has become more serious. So, Each local government is promoting rural areas development project, like Culture Village Project, Rural Village Project, Happiness Village Project, and Farming and Fishing New-town Project, to attract inhabitants in the Urban Area. This study examines the change of policy about rural areas development project in Corea through theoretical study, and analyzes the Implementation of rural village Project supported or implemented by local community to characterize the project.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.393-395
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• 2005

Super In Plane Switching (S-IPS) technology is applied for large TFT-LCD panels used in TV applications. It has a lot of advantages in comparison to the alternative, VA technology. S-IPS shows excellent viewing angle properties and fast response time between intermediate gray levels. If the performance parameters which describe the actual visual performance are considered, S-IPS is much more $advantageous.^{1)}$ However, it shows relatively low contrast ratio in diagonal direction compared to viewing angle characteristic in upper/down direction in S-IPS. In order to compensate the relatively low diagonal contrast ratio, Super-IPS applying for optical film developed, but Super-IPS still has the problem of color shift in black $pattern.^{2)}$ So we improved this problem by developing Enhanced Super-IPS.

• Korean Journal of Computational Design and Engineering
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• v.12 no.5
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• pp.354-365
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• 2007

We present novel methods to generate a sequence of shapes that represents the pattern of morphological development or transformation of Bezier curves. The presented methods utilize the intrinsic geometric structures of a Bezier curve that are derived from rib and fan decomposition (RFD). Morphological development based on RFD shows a characteristic pattern of structural growth of a Bezier curve, which is the direct consequence of development path defined by fans. Morphological transformation based RFD utilizes development patterns of source and target curves to mimic the theory of evolutionary developmental biology: although the source and target curves are quite different in shapes, we can easily find similarities in their younger shapes, which makes it easier to set up feature correspondences for blending them. We also show that further controls on base transformation for intensity of feature blending, and extrapolation can compensate the immaturity of blended curves. We demonstrate the experimental results where transformation patterns are smoother and have unique geometric style that cannot be generated using conventional methods based on multi-linear blending.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2010.03a
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• pp.169-170
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• 2010

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2003.10a
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• pp.257-262
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• 2003

This study is aimed to research the management methodology for the process of GIS database construction. In general, used methodologies are made for the purpose of application program development. And the methodologies reflected GIS characteristics are also applied for GIS software development. But the software methodologies are never introduced to construction of GIS database. In this study, various common methodologies are investigated and analyzed, and the methodology which include the characteristic of GIS database construction process as work steps and detail paths is developed and suggested.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.656-658
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• 1992

Electronically controlled magnetic bearings offer two major advantages over conventional ball bearings: there is no mechanical wear, and the shaft position is under precision control. The former characteristic is useful in rotary systems, which require reliability under maintenance-free conditions. In this paper, we introdue development tendency and technology of magnetic bearing.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.5B no.1
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• pp.1-5
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• 2005

The vector magnetic property is defined as the relationship between the magnetic field strength vector H and the magnetic flux density vector B. It is very important for the development of high efficiency and the high-density electric machines. The electrical steel sheet for the machine core shows the remarkable vector behavior by the high magnetic flux density level. In this paper, the magnetic characteristic analysis using E&S2 model is introduced as the useful technology for the design and development.