• 건축역사연구
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• 제13권2호
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• pp.71-81
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• 2004

This paper discusses of the problem of direction and orientation of site design of a traditional Korean village. The research focus on how the directional orientation of each houses adapt the direction of the flow of surrounding mountains. The direction of mountains worked as a prime rule which most of the houses( 76.6%) observed the same direction as their own orientation. While the central part of the village followed the direction of mountains more strictly, however the houses on the periphery area tend to be more free from the direction of mountains. This houses of the periphery respect either the direction of the mountain flow right behind the house or faces toward the south.

• 로봇학회논문지
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• 제10권3호
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• pp.154-161
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• 2015

Conventional path tracking methods designed for two-wheeled differential drive robots are not suitable for omni-directional robots. In this study, we present a controller which can accomplish more accurate path tracking and orientation correction by exploiting the unconstrained movement capability of omni-directional robots. The proposed controller is proven to be stable using a Lyapunov stability criterion. Various experiments in real environments show that performance of path tracking and orientation correction has improved in the proposed controller.

• 건축역사연구
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• 제18권3호
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• pp.27-44
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• 2009

In Korea, the direction of houses are typically determined by considering the directional orientation and shape of the mountain range rather than ignoring the geographical feature of the mountain range. Traditional villages of Korea are known to have very particular ways of adopting the geomantic surroundings of natural environment. This is very true especially have a high mountain in the back and a lower mountain in front. At the same time, most of the houses tend to prefer south as a man direction so that they can receive more sun light. However, if the mountain range faces north, it will not be easy to determine the directional orientation of houses. This paper, therefore, tries to identify how the houses of villages facing north, direst the orientation. This, the northern village, solves the problem by facing all direction rather than one major direction. The houses of the villages facing north, tend to revise the direction by changing the back mountain(주산) or front mountain(인산) that helps them change the direction towards he range of eastern or western direction. As a result, the houses tend to the direction towards east and wes compared to north and south. The directional orientation of houses was clearly distributed or concentrated by depending of the shape and directional orientation of the mountain range. This kind of research let us know the relationship between the natural north direction, the direction of geomantic surrounding, and the direction of houses in traditional Korean villages.

• 한국농촌건축학회논문집
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• 제11권3호
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• pp.45-52
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• 2009

This study is about the co-relationship between the directional orientation of the houses and the geometric direction in the Korean traditional villages. The major mountain in the back of the village and the front mountain ranges give the most important influence for the direction of the houses. This paper, therefore, tries to identify how the houses of villages facing South-west direct the orientation. The village, where the natural environment face the South-west village, solves the problem by facing major direction rather than one all direction. All houses observe and respect the circumstance of geomantic surrounding to the extant that almost no houses revise its direction without any geomantic reference. This kind of research let us know the relationship between the natural direction, the direction of geomantic surrounding, and the direction of houses in traditional Korean villages.

• Composites Research
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• 제16권5호
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• pp.39-44
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• 2003

복합재료에 삽입된 점탄성 재료는 복합재구조물의 감쇠물성을 크게 증가시킨다. 일반적으로 점탄성 재료는 등방성이므로 모든 방향의 감쇠물성이 동일하다. 최근 재료의 방향에 따라 감쇠물성이 변하는 이방성 감쇠재료의 개발이 요구되고 있다. 이방성 감쇠재료는 점탄성 재료 내부에 얇은 섬유를 삽입하여 제작한다. 삽입된 섬유는 댐핑재료의 강성에 큰 영향을 주며 강성은 고전 적층판 이론을 따르게 된다. 본 논문에서는 Ni와 Adams의 이론을 이용하여 손실계수를 평가하였다. 그리고 방향성 있는 감쇠재료의 영향을 평가하기 위해 저속충격 거동해석을 수행하였다. 해석결과로부터 방향성 있는 감쇠재료는 복합적층판의 진동 및 감쇠특성에 큰 영향을 줌을 보였다

• 한국농촌건축학회논문집
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• 제15권4호
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• pp.69-78
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• 2013

The location of villages differs by position, and the method to form the conditions of location varies greatly. This study has comprehensively investigated village layout in the riverside and directional relations in houses. With changes in riverside landscape and transition to an agriculture-oriented village, there have been changes in road and the size, shape and direction of houses as well. In terms of the direction of houses situated along the river, a house facing the river accounts for more than half of all houses in the village. As traditional houses are transformed into modern houses over time, houses have become bigger, and the number of the houses facing south or southeast has been on the rise. As described above, riverside landscape and preference for the house facing south have an effect on determination of the facing direction of houses. However, the direction of geographical features of the village was first followed, and other conditions have been reflected, and the characteristics for the facing direction of houses have been observed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.302-305
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• 2003

In this paper, dynamic behaviors of a small-sized flying robot with 4 rotors propelled by DC motor are discussed, and a control scheme based on the dynamic model to make stable flying motions, i.e., hovering, take-off, cruising behavior, etc. is proposed. The experimental results via some flying tests show good performances for practical use. The flying robot with 6DOF is controlled only 4 DOF, and the rest of two DOF are remained under the dynamic constraints. How to give the stability of all positions and orientations and to make the omni-directional motions in spite of such restrictions is analyzed. The proposed control scheme composes of two stages. First, PD control inputs for the trust-force and orientation are calculated, next the control inputs are distributed to each rotor by using a sort of Jacobian matrix. To design and control of a low cost - small sized flying robot, vibrated gyro sensor, cheap accelerometer, IR, and ultra sonic sensors are selected.

• 제어로봇시스템학회논문지
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• 제14권5호
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• pp.483-488
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• 2008

An active omni-directional raging system using an omni-directional vision with structured light has many advantages compared to the conventional ranging systems: robustness against external illumination noise because of the laser structured light and computational efficiency because of one shot image containing $360^{\circ}$ environment information from the omni-directional vision. The omni-directional range data represents a local distance map at a certain position in the workspace. In this paper, we propose a matching algorithm for the local distance map with the given global map database, thereby to localize a mobile robot in the global workspace. Since the global map database consists of line segments representing edges of environment object in general, the matching algorithm is based on relative position and orientation of line segments in the local map and the global map. The effectiveness of the proposed omni-directional ranging system and the matching are verified through experiments.

• 한국분말재료학회지
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• 제25권4호
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• pp.331-335
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• 2018

This study investigates the directional recrystallization behavior of Ni based oxide dispersion strengthened (ODS) alloy according to the zone annealing velocity. The zone annealing temperature is set as $1390^{\circ}C$, while the zone velocities are set as 2.5, 4, 6, and 10 cm/h, respectively. The initial microstructure observation of the as-extruded sample shows equiaxed grains of random orientation, with an average grain size of 530 nm. On the other hand, the zone annealed samples show a large deviation in grain size depending on the zone velocities. In particular, grains with a size of several millimeters are observed at 2.5-cm/h zone velocity. It is also found that the preferred orientation varies with the zone annealing velocity. On the basis of these results, this study discusses the role of zone velocities in the directional recrystallization of Ni base ODS alloy.

• 과학교육연구지
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• 제38권1호
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• pp.103-119
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• 2014

이 연구의 목적은 중학교 일정성분비의 법칙 수업에서 드러난 과학교사의 교수지향과 이의 형성에 영향을 준 요인을 알아보는 것이었다. 이를 위해 이 연구에 참여한 과학 교사 8명의 수업을 녹화 및 분석하고 면담, CoRe 질문지 등을 통하여 자료를 수집하였다. 수업 과정에서 드러난 교사의 활동으로부터 그의 과학교수 지향을 알아내고, 수집한 자료의 분석을 통하여 각 교사의 교수지향 형성에 영향을 준 요인을 추출하였다. 연구 결과, 과학교사들의 교수지향은 크게 활동 지향과 강의 지향으로 구분되었으며, 활동 지향은 다시 탐구적 혹은 비탐구적, 강의 지향은 상호작용 중심 혹은 내용전달 중심으로 범주화 되었다. 과학교사들의 교수지향 형성에 영향을 준 요인은 수업경험을 통한 반성적 사고, 동료교사와의 상호작용, 교육환경에 대한 고려, 학습자로서의 수업 및 연수내용, 교사 자신의 흥미와 호기심이었는데, 그 중에서 수업 경험을 통한 반성적 사고가 가장 큰 영향을 주었고, 교사 자신의 흥미와 호기심은 제한적이지만 긍정적인 과학교수 지향 형성에 강력한 영향을 주었다. 반면에 교육환경에 대한 고려는 다른 요인들과는 달리 교사들의 과학교수 지향 형성에 부정적인 영향을 미치는 것으로 나타났다. 동료교사와의 상호작용, 대학이나 대학원에서의 수업 내용 및 현직 교사를 위한 연수 내용은 과학교수 지향 형성에 일정 부분 영향을 주었으나, 주로 교과내용 지식의 형성에 영향을 주는 수준으로 나타났다.