• ETRI Journal
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• 제33권3호
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• pp.415-422
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• 2011

In this paper, we present a novel vision-based method of recognizing finger actions for use in electronic appliance interfaces. Human skin is first detected by color and consecutive motion information. Then, fingertips are detected by a novel scale-invariant angle detection based on a variable k-cosine. Fingertip tracking is implemented by detected region-based tracking. By analyzing the contour of the tracked fingertip, fingertip parameters, such as position, thickness, and direction, are calculated. Finger actions, such as moving, clicking, and pointing, are recognized by analyzing these fingertip parameters. Experimental results show that the proposed angle detection can correctly detect fingertips, and that the recognized actions can be used for the interface with electronic appliances.

• Journal of Power Electronics
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• 제2권1호
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• pp.25-31
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• 2002

Servo drives with microcomputer control provide the possibility of using modern and sophisticated control algorithms. As an additional feature it is possible to implement parallel and/or redundant software and hardware structures to realise safe motion or similar security functions. Unfortunately microcomputer control also has some impact on the behaviour of servo drives. Control algorithm, cycle time, sensors and interface have to be perfectly synchronised. Special control schemes are necessary on the line side (power supply) to meet the actual requirements concerning EMC. This contribution presents experiences and results obtained from a modern digital drive system pointing out the influences of low and high accuracy position sensors and the interdependencies mentioned above.

• 디자인학연구
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• 제17권4호
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• pp.61-68
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• 2004

근래 작은 크기의 하드웨어 안에 첨단기능을 탑재한 다양한 ㅎ대용 기기들이 시장에 등장하고 있다. 이러한 기기들은 그 성능을 극대화하기 위하여 서로 다른 입력방법의 특성을 이해하고 충분한 방법안에서 그것들을 활용해야 한다. 본 연구의 목적은 각 입력방법의 특성을 이해함으로서 휴대용 기기의 사용자 인터페이스를 좀 더 효과적으로 디자인할 수 있게 하는 것이다. 이를 위해 본 연구에서는 휴대용 기기의 소형 표시창에서 팬과 커서키를 이용한 타겟 포인팅 수행도를 비교하기 위하여 두가지 실험을 실시하였다. 첫 번째 실험에서 우리는 서로 다른 타겟 크기에서 두가지 입력방법에 의한 타겟 포인팅 수행도를 조사하였다. 타겟의 크기가 5mm보다 작을 경우 펜을 이용한 이력이 하드웨어키를 이용한 입력보다 더 에러가 많지만 타겟크기가 5mm일때 에러율이 키입력과 같은 수준으로 감소한다는 것을 발견했다. 두 번째 실험에서 우리는 타겟의 개수가 미치는 영향을 조사하였다. 그 결과 타겟의 크기가 5mm일때 타겟의 거리가 3단계 경로길이을 초과할 경우 펜 입력이 하드웨어키 입력보다 더 빨리 타겟 포인팅할 수 있다는 것을 알았다.

• 인터넷정보학회논문지
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• 제4권4호
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• pp.9-14
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• 2003

GUI(Grophic User Interface) 기반의 상호작용은 컴퓨터를 더 사용하기 간단하고 쉽게 만들었다. 그러나 GUI 기반의 상호작용은 자연스럽고 직관적이며 적응적인 사용자의 요구사항을 만족시키기 위해 필요한 상호 작용 기능을 쉽게 지원하지는 못한다. 본 연구에서는 이미지 시퀀스에서 손을 추적하고 가상 현실에서 포인팅 장치로 마우스를 대체하기 위해 각 비디오 프레임에서 손을 인식하는데 유용한 방법인 수정 BMA를 제안했으며 이를 이용해 초당 30 프레임의 HCI 시스템을 구현했다. HCI 시스템을 구현하는데 가장 중요한 기준은 정확한 움직임 벡터 포착과 그의 실시한 처리이다. 수정 BMA는 실시간 처리를 위해 손의 위치, 움직임 방향을 고려한 손 영역을 분할, 손 영역의 색상 분포를 예측하는데 적용했다. 실험 결과는 YCbCr 좌표를 이용한 수정 BMA가 실시간 처리와 인식율을 보장함을 보여 준다. YCbCr 색상 좌표는 각 픽셀 색상의 휘도를 제거한 RGB 색상 좌표보다 더 적은 비트로 코딩 가능하며 주변 상황에 덜 민감하다. 수정 BMA를 이용한 손 추적은 가상현실, 게임과 장애인을 위한 HCI시스템 적용가능하다.

• 한국환경과학회지
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• 제9권6호
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• pp.443-447
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• 2000

Chonan and Asan city have been a focal point due to rapid development as the first station for Express Railroad and key cities West Coast Development Region. Gokgyo stream adjacent to the cities plays an important role as a drainage channel for an agriculture and a discharger of urban storm water. Waster quality of the stream has been deteriorating caused by pollution sources such as a untreated wastewater discharge and runoff from the watershed. In the study, we conducted 4 surveys in April, May, July, and September to understand the current state of water quality for the stream and to make it possibe to predict future water-quality variation for future development. The system runs on a personal computer under the windows enviroment and provides extensive graphic user interface(GUI) for user-friendly assessment. Using the pull-down menus provided by the GUI panel, the user is able to operate the system by pointing and clicking the icon to identify the state of water-quality at locations concerned. Furthermore, we developed an integrated watershed management system. The constructed system could be a useful tool as a decesion maker for pollution source control strategy.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.456-460
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• 2008

`디지로그 북 (Digilog Book)' 은 아날로그 책과 디지털 콘텐츠의 장점을 통합함으로써, 아날로그적 감성과 디지털 오감을 함께 느끼도록 한다. 본 논문에서는 디지로그 북의 한 예로써, 범종 체험 시스템 구현에 관한 기술적인 사항을 언급한다. 시스템 구현은 사용자에게 다감각 피드백 (multisensory feedback) 을 제공, 책에 마커를 그림 마커로 대체하는 것, 책의 2D 평면에서 범종이 나올 의 효과, 범종 관찰을 위한 가상버튼을 손으로 누를 수 있도록 하는 부분, 감각형 객체를 이용하여 범종을 타종하는 것, 그리고 마지막으로 감각형 객체를 이용하여 범종의 특정 부분을 포인팅하여 특정 설명을 볼 수 있는 것을 포함한다. 본 논문에서 구현된 범종 체험 시스템은 사용자에게 우리나라의 문화유산을 체험해 볼 수 있는 교육적인 콘텐츠를 제공할 수 있다.

• Asian review of World Histories
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• 제4권1호
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• pp.35-81
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• 2016

The objective of this essay is to propose a cultural history of cosmography and cartography from the thirteenth to the sixteenth centuries. It focuses on some of the processes that characterized these fields of knowledge, using mainly western European sources. First, it elucidates the meaning that the term cosmography held during the period under consideration, and the scientific status that this composite field of knowledge enjoyed, pointing to the main processes that structured cosmography between the thirteenth century and the sixteenth century. I then move on to expound the circulation of cosmographic knowledge among Portugal, Venice and Lisbon in the fourteenth and fifteenth centuries. This analysis will show how cartography and cosmography were produced at the interface of articulated commercial, diplomatic and scholarly networks; finally, the last part of the essay focuses on the specific and quite distinctive use of cosmography in fifteenth-century European culture: the representation of "geo-political" projects on the world through the reformulation of the very concepts of sea and maritime networks. This last topic will be developed through the study of Fra Mauro's mid-fifteenth-century visionary project about changing the world connectivity through the linking of several maritime and fluvial networks in the Indian Ocean, Central Asia, and the Mediterranean Sea basin, involving the circumnavigation of Africa. This unprecedented project was based on a variety of sources accumulated in the Mediterranean Sea basin as well as in Asia and in the Indian Ocean over the course of several centuries.

• 로봇학회논문지
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• 제15권3호
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• pp.240-247
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• 2020

This paper presents a novel knitted data glove system for pattern classification of hand posture. Several experiments were conducted to confirm the performance of the knitted data glove. To find better sensor materials, the knitted data glove was fabricated with stainless-steel yarn and silver-plated yarn as representative conductive yarns, respectively. The result showed that the signal of the knitted data glove made of silver-plated yarn was more stable than that of stainless-steel yarn according as the measurement distance becomes longer. Also, the pattern classification was conducted for the performance verification of the data glove knitted using the silver-plated yarn. The average classification reached at 100% except for the pointing finger posture, and the overall classification accuracy of the knitted data glove was 98.3%. With these results, we expect that the knitted data glove is applied to various robot fields including the human-machine interface.

• 통합자연과학논문집
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• 제11권4호
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• pp.192-196
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• 2018

The mobile agent paradigm can be exploited in a variety of ways, ranging from low-level system administration tasks to middle ware to user-level applications. Mobile agents can be useful in building middle-ware services such as active mail systems, distributed collaboration systems, etc. An active mail message is a program that interacts with its recipient using a multimedia interface, and adapts the interaction session based on the recipient's responses. The mobile agent paradigm is well suitable to this type of application, since it can carry a sender-defined session protocol along with the multimedia message. Mobile agent communication is possible via method invocation on virtual references. Agents can make synchronous, one-way, or future-reply type invocations. Multicasting is possible, since agents can be aggregated hierarchically into groups. A simple check-pointing facility has also been implemented. Another proposed solution is to use multi agent computer systems to access, filter, evaluate, and integrate this information. We will present the overall architectural framework, our agent design commitments, and agent architecture to enable the above characteristics. Besides, the each information needed a mobile agent system such as text, graphic, image, audio and video etc, constructed a great capacity multimedia database system. However, they have problems in establishing connections over multiple subnetworks, such as no end-to-end connections, transmission delay due to ATM address resolution, no QoS protocols. We propose a new connection management scheme in the thesis to improve the connection management involved of mobile agent systems.

• 천문학회보
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• 제44권1호
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• pp.82.2-82.3
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• 2019

Korea Astronomy and Space Science Institute (KASI), in collaboration with the NASA Goddard Sparce Flight Center (GSFC), will develop a next generation coronagraph for the International Space Station (ISS). COronal Diagnostic EXperiment (CODEX) uses multiple filters to obtain simultaneous measurements of electron density, temperature, and velocity within a single instrument. CODEX's regular, systematic, comprehensive dataset will test theories of solar wind acceleration and source, as well as serve to validate and enable improvement of space-weather/operational models in the crucial source region of the solar wind. CODEX subsystems include the coronagraph, pointing system, command and data handling (C&DH) electronics, and power distribution unit. CODEX is integrated onto a standard interface which provides power and communication. All full resolution images are telemeters to the ground, where data from multiple images and sequences are co-added, spatially binned, and ratioed as needed for analysis.