• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.4
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• pp.343-354
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• 2021

The purpose of this study is to contribute to an understanding of the policy instruments used by the public sector to ensure cooperation with the private sector in the delivery of space policy. Despite the importance of public and private partnership in recent years, there has been a lack of research on policy instruments. This study categorized 16 policy instruments into 4 types: purchase contracts, capital subsidies, research and development support and input subsidies. In addition, 5 cases of public private partnership in the United State, Europe and Japan were studied to explore policy implications to strength industrial competition.

• Structural Engineering and Mechanics
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• v.51 no.6
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• pp.1067-1089
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• 2014

In this paper, three dimensional static and dynamic analyses of two dimensional functionally graded annular sector plates have been investigated. The material properties vary through both the radial and axial directions continuously. Graded finite element and Newmark direct integration methods have been used to solve the 3D-elasticity equations in time and space domains. The effects of power law exponents and different boundary conditions on the behavior of FGM annular sector plate have been investigated. Results show that using 2D-FGMs and graded elements have superiority over the homogenous elements and 1D-FGMs. The model has been compared with the result of a 1D-FGM annular sector plate and it shows good agreement.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.819-824
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• 2008

Energy consumption in Korea and Japan has already progressed to high level. Especially, it will be important to take up the effort to achieve further energy savings in residential sector that has significant increase both nations. For this reason, research for energy consumption and saving method in residential sector compare Korea with Japan that of similar data to grasps the direction for energy savings. In addition for introduction of distributed energy system to residential sector, such as apartment house, the electricity and gas demand was simulated. To be more specific, several key characteristics were studied, such as housing type housing scale and width of common space.

• Journal of Astronomy and Space Sciences
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• v.36 no.3
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• pp.133-147
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• 2019

Challenging Minisatellite Payload (CHAMP) satellite magnetic data are used to investigate the latitudinal variation of the storm-time meso-scale field-aligned currents by defining a new metric called the FAC range. Three major geomagnetic storm events are considered. Alongside SymH, the possible contributions from solar wind dynamic pressure and interplanetary magnetic field (IMF) $B_Z$ are also investigated. The results show that the new metric predicts the latitudinal variation of FACs better than previous studies. As expected, the equatorward expansion and poleward retreat are observed during the storm main phase and recovery phase respectively. The equatorward shift is prominent on the northern duskside, at ${\sim}58^{\circ}$ coinciding with the minimum SymH and dayside at ${\sim}59^{\circ}$ compared to dawnside and nightside respectively. The latitudinal shift of FAC range is better correlated to IMF $B_Z$ in northern hemisphere dusk-dawn magnetic local time (MLT) sectors than in southern hemisphere. The FAC range latitudinal shifts responds better to dynamic pressure in the duskside northern hemisphere and dawnside southern hemisphere than in southern hemisphere dusk sector and northern hemisphere dawn sector respectively. FAC range exhibits a good correlation with dynamic pressure in the dayside (nightside) southern (northern) hemispheres depicting possible electrodynamic similarity at day-night MLT sectors in the opposite hemispheres.

• The Bulletin of The Korean Astronomical Society
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• v.33 no.1
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• pp.37.1-37.1
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• 2008

• Journal of the Architectural Institute of Korea Planning & Design
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• v.34 no.3
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• pp.11-21
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• 2018

This paper explores the structure of space in architecture from a viewpoint that individual unitized spaces are gathered to form the whole. To understand the spatial structure of architecture, firstly we need to understand each unitized spaces, and secondly, one must understand how the following adjacent spaces are connected to form the whole building. this gives salience to a fact that understanding the whole comprehensively. It is the most fundamental bases that must be understood and unitized when understanding the spatial structure of an existing building and designing a new one. It is necessary to hypostatize space as an abstract notion. In regards to this space examines the logical flow of structure within actual space. Hypostasieren process includes the process of shaping space and the shape information. In this process we need to refer to the properties of space and the morphological characteristics of physical elements. The segment of the unitized space is the realization process of the basic space. This study aims to provide a theoretical basis for analysis and design of spatial structure by comparing several representative methods of segmenting unitized space.

• Korean Institute of Interior Design Journal
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• v.18 no.5
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• pp.128-136
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• 2009

This study analyzed and defines the property of visual perception throughout the revision of the observation time of the original space and the rotating space. The conclusions of this study are as fellows: First, based on the existing theory and experiment, the study obtained the basis which decides the sector data originating fixation-gaze after staring the specific sector over 300ms time. It will become the turning point hereafter for our research to fix the time in this way. Second, in analyzing the minute data, the study built a revision method of the observation time by analyzing the meanings and the reasons of the revision of the original data. Third, according to the difference of revision quantity, female testee have more increases in the amount of data than male testee from the original screen. On the other hand, the opposite tendency appears from the previous data. This shows there is a difference in the observation properly by sex. Last, we could grasp Information about the property of the observation time throughout eyeball fixations, and the revision and analysis of the 'controlled observation data'. These data can be used in design element arrangement of interior space, hereafter.

• Journal of Institute of Control, Robotics and Systems
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• v.5 no.1
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• pp.1-10
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• 1999

We consider the problem of synthesizing an internally stabilizing linear time-invariant controller for a linear tune-Invariant plant such that a given closed loop transfer function is strictly sector bounded. We show that the standard $H{\infty}$ control problem and the $\tau$ -positive real control problem are special cases of sector bounded control problem. Necessary and sufficient conditions for the existence of a controller are obtained. The state-space representation for strictly proper controllers are given in terms of solutions to ARIs or AREs.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2224-2226
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• 1997

공간벡터 펄스폭변조법과 관련하여 과변조시의 전류제어성능을 향상시킬 수 있는 벡터 과변조의 새로운 연산 알고리즘으로 유효전압벡터를 반지름으로 하는 원을 이용하여 수정된 기준전압벡터가 위치할 섹터를 구하고, 전압제한 6각형을 나타내는 전압벡터식을 이용하여 동일한 수식으로 벡터과변조하는 간결한 새로운 알고리즘을 제시하고, 이를 전류제어 시뮬레이션에 적용하였다.

• 한국항공우주법학회:학술대회논문집
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• 2008.05a
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• pp.19-30
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• 2008

This paper is intended to identify the main problems for attracting inbound tourists in Korea in conjunction with aviation sector. This paper mainly deals with policy issues of tourism-aviation sector. The major impediments in the aviation sector for attracting inbound tourists can be lack of flight seat supply at peak season, flight time schedule, and cooperation of Airlines. Policy suggestions for international tourism promotion in Korea can be summarized as: re-adjustment of flight time schedule between Japan-Korea routes, market promotion for attracting Chinese visitors, development of Korea-China-Japan triangular tourism product, efficient provision of airport facility, and in particular collaboration between government sectors of countries and private sectors of Airlines and travel agencies.