• Journal of the Korean Wood Science and Technology
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• v.31 no.2
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• pp.77-83
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• 2003

In this research, in order to investigate the effect of hot-pressing condition, properties of bamboo zephyr boards (target density 0.7 g/cm³, 400×400×12 mm) produced by different hot-pressing time and temperature were compared through Korean Standard(KS) F 3104 and F 3113, and the results were summarized as follows: All of the boards had comparatively high values in bending properties (MOR, MOE) irrespective of hot-pressing condition, and the boards hot-pressed by 160℃ and 12 min showed the highest strength in parallel direction of board-surface to span. Internal bond (IB) strength of the boards generally increased with the increase of hot pressing temperature. Boards produced by hot pressing temperature and time of 160℃ and 12 min and 180℃ and 10 min exhibited relatively higher wet-bending strength. Thickness swelling (TS) of all the boards showed good dimensional stability of 6% or less.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.31-37
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• 2018

When an IoT system is constructed, a dashboard is also developed to monitor the values of sensors in the IoT System. Much time and money, however, are spent in developing the dashboard software. This paper presents design and implementation details of a dashboard maker called as YellowPeach, which helps to create a dashboard easily and fast without programming. Using YellowPeach, the user can author a dashboard by putting predefined charts to display values of sensors in it, and store the dashboard as a JSON file. Also an web application has been developed to run the dashboard on the web browser. The dashboard viewer web application connects on MQTT-based IoT system, receives values from the sensors, and displays the values on charts in real-time.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1619-1622
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• 2002

최근에 생산되는 디지털 VLSI칩들은 그 집적도가 계속 높아지고 있으며, 이러한 칩들을 장착한 보드의 경우도 그 복잡성이 점차 높아지고 있다. 이에 따라 칩 및 보드에 대한 철저한 테스트 과정이 요구된다. 지금까지 보드 테스트 방법으로 널리 쓰였던 ICT(In-Circuit Test)는 칩의 고집적화에 따른 핀 간격의 조밀화와 SMT(Surface Mount Technology), BGA(Ball Grid Array), MCM(Multi Chip Module) 등의 새로운 패키징 방식의 등장에 따라 테스트 방법으로의 한계성을 드러내고 있다. 이에 대한 대안으로 등장한 IEEE Std 1149.1 은 ICT의 한계성을 극복할 수 있는 기술일 뿐 아니라 여러 가지 장점을 가지고 있으며 그 활용 분야도 다양하다. 본 논문에서는 IEEE Std 1149.1에 따라 설계된 보드 상에서 발생 가능한 고장들에 대한 고장 모델을 제시한다. 또한 각 고장 모델들의 양상과 진단 기법을 제시한다. 이를 통해 IEEE Std 1149.1에 따라 설계된 보드 상에서 발생한 고장들을 검출할 수 있으며, 고장의 종류 및 성격, 그리고 고장의 발생 위치 등의 정보를 얻을 수 있다. IEEE Std 1149.1에 따른 보드 설계가 보드의 신뢰성 보장에 긴요함을 인식하는 계기가 되기를 기대하며 제시된 고장 모델 및 진단 기법이 기술적으로 중요한 참고자료가 되기를 기대한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.1
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• pp.355-363
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• 2012

The Integration of multi-agent architecture and blackboard architecture may lead to a new architecture to cope with new application areas which need some good and strong points of both the architectures. This paper suggests an integrated architecture of blackboard architecture and multi-agent architecture by using event-based implicit invocation pattern and a blackboard event detection mechanism based on Rete network. From the viewpoints of weak couplings of system components and flexible control of knowledge source agents, it is desirable to use the event-based implicit invocation pattern in the integrated architecture. But the pattern itself does not concern the performance of the architecture, and it is very critical to the performance of the integrated architecture to detect efficiently the blackboard events which can activate knowledge source agents which can contribute to the problem-solving processes of the integrated architecture. The integrated architecture suggested in this paper uses a blackboard event detection mechanism based on Rete network to detect efficiently blackboard events which can activate knowledge source agents.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.6
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• pp.525-534
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• 2018

Camera calibration is the process of determining the parameters such as the focal length of a camera, the position of a principal point, and lens distortions. For this purpose, images of checkerboard have been mainly used. When targets were automatically recognized in checkerboard image, the existing studies had limitations in that the user should have a good understanding of the input parameters for recognizing the target or that all checkerboard should appear in the image. In this study, a methodology for automatic target recognition was proposed. In this method, even if only a part of the checkerboard image was captured using rectangles including eight blobs, four each at the central portion and the outer portion of the checkerboard, the index of the target can be automatically assigned. In addition, there is no need for input parameters. In this study, three conditions were used to automatically extract the center point of the checkerboard target: the distortion of black and white pattern, the frequency of edge change, and the ratio of black and white pixels. Also, the direction and numbering of the checkerboard targets were made with blobs. Through experiments on two types of checkerboards, it was possible to automatically recognize checkerboard targets within a minute for 36 images.

• Journal of the Korean Wood Science and Technology
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• v.41 no.1
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• pp.64-76
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• 2013

In this study, eco-friendly hybrid composite boards were manufactured from green tea, three kinds of charcoals and wood fiber for developing interior materials to reinforce the strength performances and the functionalities in addition to performances of the green tea-wood fiber hybrid boards. The effects for the kind and the component ratio of raw materials on mechanical properties were investigated. Bending strength performances of hybrid composite boards were highest in the hybrid composite boards composed of green tea, fine charcoal and wood fiber on average. However, the difference caused by the kind of charcoals was not large. These values were was markedly improved than those of green tea - wood fiber hybrid composite boards reported in previous researches. And it was found that the bending strength performance decreased with increasing component ratios of green tea and charcoals. The difference between urea resins used as the binder showed the higher value in hybrid composite boards using $E_1$ grade urea resin than in those using $E_0$ grade urea resin, but the difference between hybrid composite boards manufactured by both resins decreased markedly than the green tea - wood fiber hybrid composite boards reported in previous research. The internal bond strength of hybrid composite boards was in the order of hybrid composite boards with fine charcoal, activated charcoal and black charcoal, and it was found that the hybrid composite boards with fine charcoal had a similar values to control boards composed of only wood fiber.

• Journal of Digital Convergence
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• v.20 no.1
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• pp.257-263
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• 2022

In the current era of Corona, the positive potential of board games is emerging as the 'untact' is accelerating. This situation can be seen as an opportunity to have a positive impact on the development of the board game industry depending on how to develop board games in a more interesting, high-quality and educational way than before. To this end, this study intends to present a methodology for deriving the relative importance of important factors in board game development among the preceding studies and methodologies for more advanced board game development by board game developers and experts. This study is to derive the relative importance of important factors in board game development. To this end, important factors in board game development for board game developers and experts were derived through the Delphi method, and the Delphi method in the ranking format was used to rank the relative importance of the derived factors. This study focused on the development model of playing cards among board games. Priority analysis result, development and planning composition, prior research analysis, draft production, production, validation, application, and review in order of importance were derived(were derived in the order of importance). The results of this study are expected to provide practical guidelines for companies to prioritize and utilize development according to their importance when developing board games.

• Proceedings of the KIEE Conference
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• 2008.04a
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• pp.135-136
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• 2008

본 연구에서는 USB(Universal Serial Bus)통신과 전기적 절연을 이용하여 생체신호계측이 가능한 USB 데이터 수집(DAQ, Data acquisition)보드를 설계 및 구현한 것이다. 대부분의 데이터 수집보드는 전기적 절연이 되어 있지 않기 때문에 의용계측에 있어서 적합하지 않다. 보드를 평가하기 위해 설계한 USB DAQ 보드와 PC를 사용하여 사인파와 램프신호 그리고 생체신호중 하나인 ECG 신호를 측정하였다. 제안한 USB 데이터 수집보드는 AD변환부, 전기적 절연부, 전송부, 디지털 입 출력부 그리고 DC-DC변환기(DC DC Convertor)로 구성되었고, 최대 1KHz의 샘플링 주파수와 12비트 분해능과 8채널의 성능을 가진다.

• Journal of the Korea Computer Graphics Society
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• v.13 no.2
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• pp.17-22
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• 2007

In early stages of film or animation production, storyboard is used to visually describe the outline of a story. Drawings or photographs, as well as the texts, are employed for character / item placements and camera pose. However, commercially available storyboard tools are mainly drawing and editing tools, not providing functionality for item placement and camera control. In this paper, an Augmented Reality based storyboard tool is presented, which provides an intuitive and easy-to-use interface for storyboard development. Using the presented tool, non-expert users may compose 30 scenes in his or her real environments through tangible building blocks which are used to fetch corresponding 3D models and their pose.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.728-730
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• 2016

드론 기반의 항공촬영 기법을 영화제작에 적용토록 하기 위해 드론 기반의 스토리보드 제작 시스템을 제안한다. 제작 시스템은 항공촬영 수행 전, 비행 시뮬레이션을 수행하여, 다양한 스토리보드 세트를 수집한다. 감독은 스토리보드 세트 중 가장 적합한 스토리보드를 선택한다. 선택된 스토리보드에는 촬영 영상정보와 함께, 드론 제어정보들이 포함된다. 드론의 제어정보를 실제 촬영에서 사용하여, 정밀한 항공촬영을 지원할 수 있다.