• Journal of the Economic Geographical Society of Korea
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• v.13 no.2
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• pp.159-180
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• 2010

Research on regional innovation has recently emphasized the significance and necessities of global networks. However, theoretical arguments have not provided the answers for how global networks are actually formed and work, and the related discussions have not been cohesive while introducing separate concepts originated from diverse disciplines without connecting them with each other. This paper intends to critically review theoretical concepts on spatialities of regional innovation networks and demonstrate limits of each concept, arguing that a synthetic perspective is necessary for understanding how global innovation networks work. The author introduces, specifically, the concept of transnational ethnic communities, which has been recently given much attention to investigate global innovation networks, and provide its theoretical and policy implications.

• Journal of the Korean Society of Propulsion Engineers
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• v.22 no.4
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• pp.12-17
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• 2018

A natural cavitation-type high-speed underwater vehicle with solid rocket motor is tested, and its speed and running distance are measured. The outputs from pressure sensors on the surface of the vehicle reveal a pressure-time history reflecting the development of supercavitation. Underwater cameras installed on the wall of the test pool record the entire process from the onset of supercavitation to its full development. CNU-SuperCT, based on two-dimensional inviscid theoretical analysis, is used to simulate test results. Considering CNU-SuperCT does not include the control fins of the vehicle, simulation results agree with test results very well. Additionally, pictures from underwater cameras support the test results.

• The Journal of Sustainable Design and Educational Environment Research
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• v.18 no.4
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• pp.21-32
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• 2019

In this study, we the characteristics of the spatial layout have been analyzed focusing on the case of compulsory schools, which are the forms of elementary and middle integrated schools in Japan. Thus, according to the development stage of the elementary·middle students, we derived the characteristics of the space structure and layout of the classrooms of each class. and derived spatial arrangement of private and shared space of elementary and middle integrated schools. In addition, we analyzed the characteristics of subject classroom collaboration by beginner, intermediate and advanced level, derived a desirable subject classroom placement plan, and suggested the basic direction of Korean elementary and middle integrated schools focusing on the direction of space layout composition.

• 중국학논총
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• no.66
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• pp.189-209
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• 2020

本研究是通过实证分析论证中国朝鲜族企业成长发展是通过与韩国建立社会网络关系获得了企业的竞争力, 同时企业社会资本成就是为企业家所居住城市朝鲜族社会共同体提供了社会基础资本。得出论证结果:第一, 中国朝鲜族企业家具有中国人的国民性同时又具有朝鲜族的民族性。为了进入中国上曾主流社会他们更体现出中国国民性。第二, 他们积极参与居住区域的本民族社会活动以及与本民族成员之间相互交流是为了企业的利益。第三, 他们所获得的成就为企业家所居住城市朝鲜族社会共同体提供了社会基础资本。通过以上研究结果可以为抽象的离散韩国民族概念用超国境的社会网络民族共同体实证分析提供了具体说明。

• Journal of the Society of Naval Architects of Korea
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• v.52 no.3
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• pp.236-247
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• 2015

In this paper, the experimental equipments for ventilated supercavitation in cavitation tunnel is constructed and the basic data of ventilated supercavitation regard to the entrainment coefficient and Froude number is fulfilled. The experiments are conducted for the disk cavitator with injecting air and the pressure inside cavity and the shape of cavity are measured. As the entrainment coefficient increases while the Froude number is kept constant, the ventilated cavitation number decreases to a minimum value which decreases no more even with increasing the air entrainment. The minimum value of ventilated cavitation number, caused by the blockage effect, decreases according to increasing the diameter ratio of test section to cavitator. The cavity length is rapidly enlarged near the minimum cavitation number. In low Froude numbers, the cavity tail is floating up due to buoyancy and the air inside the cavity is evacuated from its rear end with twin-vortex hollow tubes. However, in high Froude numbers, the buoyancy effect is almost negligible and there is no more twin-vortex tubes so that the cavity shape becomes close to axisymmetric. In order to measure the cavity length and width, the two methods, which are to be based on the cavity shapes and the maximum width of cavity, are applied. As the entrainment coefficient increases after the ventilated cavitation number gets down to the minimum cavitation number, the cavity length still increases gradually. These phenomenon can be confirmed by the measurement using the method based on the cavity shapes. On the other hand, when the method based on the maximum width of cavity is used, the length and width of the cavity agree well with a semi-empirical formular of natural cavity. So the method based on the maximum width of cavity can be a valid method for cavitator design.

• The Korean Publising Journal, Monthly
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• s.238
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• pp.16-16
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• 1998

서울출판인포럼은 지난 10일 서울 조선호텔에서 가진 조찬모임에 이해찬 교육부 장관을 초청, '교육과 출판' 을 둘러싼 광범위한 의견을 나눴다. 이장관은 교육부가 초.중.고 권장도서목록을 올해 안에 선정할 수 있도록 30명으로 이뤄진 '새로운공동체추진위원회'(가칭)를 이달 25일까지 발족시키고, 이를 강력히 실천할 수 있도록 지역단위의 '새교육공동체 시민모임'의 정착에 간접지원하겠으며, 독서가 학교 교과과정의 한 형태로 자리잡을 수 있도록 제도화하겠다고 밝혔다. 교육의 입장에서 바라본 이장관의 독서와 출판에 대한 시각과 함께 출판인과 나눈 대화 내용을 정리해 싣는다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1998.10a
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• pp.10-10
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• 1998

천음속 익형에서 발생하는 응축충격파와 경계층의 간섭을 피동제어 하여 항력감소에 대한 연구를 2.5$\times$7$\textrm{cm}^2$ 천음속 풍동에서 수행하였다. 익형표면에 설치한 정압공으로 정압을, 익형후방에 설치한 8개의 Pitot probe로 전압을 동시에 측정하여 충격파를 통한 에너지의 손실과 항력의 변화를 계산하였고, 또한 유동장과 충격파의 형상을 가시화하기 위해 슈리렌 가시화 시스템을 사용하였다. 실험은 NACA 0012 익형에서 기공률 변화에 따른 피동제어의 항력감소 초과를 조사한 다음 NACA 64-018 익형에서는 기공률과 공동의 크기의 변화가 미치는 효과를 연구하였다. 피동제어의 개념은 충격파가 발생하는 하부벽을 다공벽으로 만들고 그 아래를 공동으로 만들면 충격파 후방의 상대적으로 높은 압력이 기류의 일부를 공동으로 자연스럽게 유입시키고 다시 공동에서 낮은 압력의 충격파 상류로 유출시키는 것이다.

• Journal of the Korea Institute of Military Science and Technology
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• v.24 no.4
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• pp.435-448
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• 2021

This study describes the depth and straight motion control performance depending on control surface combinations of a supercavitating underwater vehicle. When an underwater vehicle experiences supercavitation, friction resistance can be minimized, thus achieving the effect of super-high-speed driving. Six degrees of freedom modeling of the underwater vehicle are performed and the guidance and control loops are designed with not only a cavitator and an elevator, but also a rudder and a differential elevator to improve the stability of the roll and yaw axis. The control performance based on the combination of control surfaces is analyzed by the root-mean-square error for keeping depth and straight motion.

• Journal of Broadcast Engineering
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• v.28 no.2
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• pp.178-184
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• 2023

Finding texts in general scene images and recognizing their contents is a very important task that can be used as a basis for robot vision, visual assistance, and so on. However, for the low-resolution text images, the degradations, such as noise or blur included in text images, are more noticeable, which leads to severe performance degradation of text recognition accuracy. In this paper, we propose a new Korean text image super-resolution based on a Transformer-based model, which generally shows higher performance than convolutional neural networks. In the experiments, we show that text recognition accuracy for Korean text images can be improved when our proposed text image super-resolution method is used. We also propose a new Korean text image dataset for training our model, which contains massive HR-LR Korean text image pairs.

• Proceedings of the Costume Culture Conference
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• 2004.04a
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• pp.59-62
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• 2004

조형예술은 의상디자인 창작에 있어서 디자이너들에게 가장 큰 영감을 주는 분야라 해도 과언이 아니다 많은 디자이너들이 자신의 영감을 조형예술에서 찾는다고 볼 수 있는데 20세기 초부터 Paul Poiret를 선두로 하여 디자이너들이 예술작품에서 영감을 얻었을 뿐만 아니라 예술가들과 공동작업을 벌여왔고 예술가들의 의상디자인 직접적 관여는 의상을 예술의 위치에 놓는데 한 몫을 담당하였다. (중략)