• Bulletin of the Korean Mathematical Society
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• v.47 no.1
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• pp.53-61
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• 2010

In this article, we discuss the reflective function which can be represented by three exponential matrixes and apply the results to studying the existence of periodic solutions of these systems. The obtained conclusions extend and improve the foregoing results.

• Magazine of the Korea Concrete Institute
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• v.18 no.2 s.91
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• pp.46-51
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• 2006

• Journal of the Korean Institute of Educational Facilities
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• v.27 no.2
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• pp.14-17
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• 2020

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.1
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• pp.33-38
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• 2010

This paper examines the feasibility of using periodically varying dielectric layers with dielectric constant ${\epsilon}_1$ and ${\epsilon}_2$ at millimeter wave frequency for implementing the frequency-selective reflectors that permit feed separation in large aperture reflecting antenna systems. For oblique incidence, it is found that the total reflection can be obtained at different frequencies for proper choices of ${\epsilon}_1$, ${\epsilon}_2$ and the geometric parameters. In the frequency-selective reflector designed, the bandwidth for 90% reflection is always found to be much narrower than that for 90% transmission.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.15 no.5
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• pp.19-29
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• 2012

The purpose of this study is to suggest improvements of Eco-Natural map preparation guideline by presenting assessment methods that can be applied to the result of river ecosystem health survey and assessment, using the Geographic Information System. The area for studying is the main stream of the Hwang River where is easy to collect data and available to compare before and after of river assessment. It was reevaluated by reflecting the result of river ecosystem health assessment of the Ministry of Environment. As the result, Eco-Natural map of the study area reflecting the river assessment, the changes in the area ratio by grade have been increased from 1.14% to 14.03% in the first-grade and from 24.64% to 43.91% in the second-grade. It is considered to present more realistic grade due to the assessment of the rivers that have not been reflected in the meantime. Consequently, the result of this study will be useful for establishing the development projects on the rivers, providing the foundation for more realistic and active protection.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.10
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• pp.940-948
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• 2007

The Advanced Spent Fuel Conditioning Process(ACP), which is the process of the reduction of uranium oxide by lithium metal in a high temperature molten salt bath for spent fuel, was developed at Korea Atomic Energy Research Institute (KAERI). Since the ACP equipment is located in an intense radiation field (hot cell) as well as in a high temperature, it must be remotely operated and maintained. The ACP hot cell is very narrow so the workspace of the wall-mounted mechanical Master-Slave Manipulators(MSMs) is restricted. A Bridge Transported Servo Manipulator(BTSM) system has been developed to overcome the limitation of an access that is a drawback of the mechanical MSMs. The BTSM system consists ot a bridge crane with telescoping tubeset, a slave manipulator, a master manipulator, and a control system. We applied a bilateral position-position control scheme with friction compensation as force-reflecting controller. In this paper, the transmission characteristics on the tendon-and-pulley train is numerically formulated and analyzed. Also, we evaluate the performance of the force-reflecting servo manipulator.

• Journal of KIBIM
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• v.7 no.3
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• pp.21-30
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• 2017

In order to meet current AEC(Architecture, Engineering, Construction) industrial demand, BIM related NCS(National Competency Standards)'s study module in architectural design and construction has been created and it has been applied into the NCS-based curriculum of Specialized High Schools and Meister High Schools from March 2016. Therefore, the goal of this study is to identify the limitations BIM education in the Specialized High School and to find out the improvement plan for activation. Analysis of previous research literature and current education curriculums in the Specialized High School, and questionnaire survey of related teachers have been conducted. Finally, this paper investigated the case of BIM education in 'S' Technical High School where BIM education is carried out. This paper suggests the following three points in conclusion: 1) Updated curriculum reflecting NCS and industrial demand is necessary, 2) Continuing BIM education for teachers and financial support is necessary to get the qualified teaching capacity, 3) Curriculum reflecting BIM's possibilities needs to be developed across the interdisciplinary subjects to maximize its effect.

• The Journal of Asian Finance, Economics and Business
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• v.6 no.3
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• pp.9-18
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• 2019

The purpose of this study is to investigate the relation between conservative loan loss accounting practice of banks, defined as accounting behavior that increases loan loss allowances against expected credit losses, and bank lending. Furthermore, we specify the macroeconomic conditions reflecting debtors' borrowing environments and analyze how these conditions affect the relation between conservative loan loss allowances and bank lending. Although existing literature reports that accounting conservatism has a direct effect on non-financial firms' investment behavior, there is little evidence about an effect of conservatism on banks' lending behavior. By exploiting data showing the links between individual Japanese firms and their individual lenders to control both loan demand and supply, we estimate OLS regressions to test the relationships among conservative loan loss allowance, bank lending, and macroeconomic conditions using a unique dataset containing bank-firm-year observations between 2001 and 2013. We find banks that have conservative loan loss allowances tend to provide fewer loans to firms with financing needs when macroeconomic conditions are good and these conservative banks are likely to provide more loans to firms when macroeconomic conditions are bad. Our findings suggest that reflecting expected credit loss into loan loss allowances can mitigate the procyclical behavior of banks.

• Journal of architectural history
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• v.13 no.1 s.37
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• pp.71-81
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• 2004

The $18^{th}$ century's Industrial Revolution brought about influx of commerce, industry, and agricultural population into the urban areas, entering the $19^{th}$ century. Quality of rural communities declined, and the exploding population in the cities gave rise to various problems. 'Mietskaserne' Blockhousing was constructed by the 'Hobrechtplan', but led to social problems such as poor living conditions, insufficient sunshine due to overcrowding, slums due to incomplete urban infrastructure, epidemics, and so on. Starting in the early $20^{th}$ century, Berlin has driven forward a remodeling plan under the motto of 'critical reconstruction (kritische Rekonstruktion)'. It is performed in the place, which represents the vicissitudinous history of Berlin with site plans coexisting past with presence, using modern vocabulary of architectural forms. Reconstructing a city is a process which not only raises the economic value of each building consisting a city, but also a redevelopment process that brings out cultural value of an era. When a new era emerges buildings get reconstructed or rebuilt, and thereby form the identity of a city by reflecting its society, culture, politics, economy, and history. Old German architecture were not destroyed or rebuilt recklessly just by the fact that they are functionally or aesthetically outdated. Each building is treated as precious cultural heritage reflecting the history. This is how Berlin is being transformed today.

• Journal of Fashion Business
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• v.7 no.1
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• pp.72-83
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• 2003

The purpose of this study is to understand the history of 20th century fashion and make-up culture, analyze trend of the modern fashion and make-up, creat a cyber make-up model according to themes and also it will find out how to use make-up as a part of fashion genre. As a result of this study is 1. Looking over change-process in 20th century fashion and make-up history, we can find the popular make-up color and pattern reflecting the society and cultural environments. And also make-up culture reflecting their sense of values and way of thinkings. 2. Analyzing fashion and make up color trend of 2002 F/W, we can find a similarity between fashion and make-up color trend by comparing with hue&tone chart. All of theme have a tendency to be natural, veiled, feminine by neutral color and artifical highlighted, illuminate, transparant by clear-high saturation color. 3. Creating imagemaps, color palletes and cyber model of 4 trend themes by computer graphic, It can give more visual and interesting effect on the cyber space, and also it can help to expect make-up will be dizitalized, visualized and informationalized.