• Optical Science and Technology
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• v.8 no.2
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• pp.27-29
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• 2004

카메라폰(카메라가 장착된 휴대폰)을 얘기하기 전에 휴대폰의 진화를 살펴보는 것이 타당하다. 최초의 휴대폰이 음성 통화를 기본으로 정보의 전달 속도에 의미를 부여한 것이라면 근래에 출시되는 다양한 부가기능의 다기능 핸드폰은 정보의 속도 뿐 아니라 디지털 스틸 카메라, 인터넷 서비스, 그리고 동영상 통화를 포함한 정보의 질에서도 괄목할 만한 진보를 보이고 있으며 이제 휴대폰은 컴퓨팅 환경과 데이터 통신을 가미하며 바야흐로 Hand held PC로 그 미래를 준비중이다. 휴대폰용 카메라 모듈이 주목을 받는 이유는 전술한 대로 지금부터 전개되는 휴대용통신의 핵심 부품으로 인정되기 때문이다. 그 중에서 렌즈의 역할은 매우 중요하여 카메라폰의 경박단소화에 결정적인 부품이라고 할 수 있다.(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.907-909
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• 2004

정보화 시대가 진전됨에 따라 휴대폰과 리모콘 등 휴대용 단말기에서 한글을 입력할 필요성이 증가하고 있다. 휴대용 단말기에서 한글 입력 방식은 단말기에 부착되어 있는 제한된 버튼만을 이용해야 한다는 제약이 있다. 이러한 제약 조건 하에서 한글 모음을 편리하고 빠르게 입력할 수 있는 방법으로 'ㅏ/ㅓ/ㅗ/ㅜ/ㅡ/ㅣ/ㅐ/ㅔ'를 기본 요소로 하여 조합되는 모음의 입력 방식을 다양화하였으며, 기존의 천지인, 나랏글 방식과 비교했을 때 사용자 편의성과 입력의 신속성 측면에서 매우 효율적임을 확인하였다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.27 no.5
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• pp.456-460
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• 1998

얼마 전 영국 왕실 소속의 과학 위원회에서 오랜 연구 결과를 토대로 작성된 보고서 "21세기 위생 백서"에 의하면 21세기에 가장 무서운 무기는 핵무기나, 에너지나, 식량이 아니라 "음료용 물"이 될 것이라고 결론을 맺고 있다. 우리 역시 이제까지 물은 흔하고 구하기 쉬워 값이 싼 것으로 알아 왔으며, 절약이라는 말을 많이 사용하면서도 물에 대해서만은 예외를 인정해 왔던 것이 사실이다. 최근 물에 대한 정책 당국에서도 우리나라는 "수자원이 부족한 나라이고, 머지않아 물 부족 사태가 발생할 것"임으로 물을 절약해야 한다는 홍보를 시작한 바 있다.

• Imaging Science in Dentistry
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• v.53 no.3
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• pp.265-266
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• 2023

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2005.11a
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• pp.235-240
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• 2005

This paper presents a dual band circularly polarized microstrip patch antenna. The antenna consists of two corner truncated patches implemented in one plane and single feed point. The input signal is directly excited to the patch 2 and the patch 1 is fed from patch 2 by coupling between two patches. The antenna is operated at 900 MHz and 2.45 GHz bands and has the right hand circularly polarized radiation pattern at all. The measured gains of the antenna are 2.95 dBic at 900 MHz band and 4.6 dBic at 2.45 GHz band.

• Journal of information and communication convergence engineering
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• v.6 no.2
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• pp.177-181
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• 2008

The more improved the Internet and the information technology, the stronger cryptographic system is required which can satisfy the information security on the platform of personal hand-held devices or smart card system. This paper introduces a case study of designing an elliptic curve cryptographic processor of a high performance that can be suitably used in a wireless communicating device or in an embedded system. To design an efficient cryptographic system, we first analyzed the operation hierarchy of the elliptic curve cryptographic system and then implemented the system by adopting a serial cell multiplier and modified Euclid divider. Simulation result shows that the system was correctly designed and it can compute thousands of operations per a second. The operating frequency used in simulation is about 66MHz and gate counts are approximately 229,284.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10b
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• pp.832-836
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• 1988

"Motion Stereo" is quite useful for visual guidance of the robot, but most range finding algorithms of motion stereo have suffered from poor accuracy due to the quantization noise and measurement error. In this paper, 3-D position estimation and refinement scheme is proposed, and its performance is discussed. The main concept of the approach is to consider the entire frame sequence at the same time rather than to consider the sequence as a pair of images. The experiments using real images have been performed under following conditions : hand-held camera, static object. The result demonstrate that the proposed nonlinear least-square estimation scheme provides reliable and fairly accurate 3-D position information for vision-based position control of robot. of robot.

• Journal of the Korea Computer Graphics Society
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• v.9 no.1
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• pp.19-27
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• 2003

Most interaction schemes in virtual environment are indirect in one way or another. ln particular, without a haptic device (which introduces its own problems due to its cumbersomeness), users must rely on visual (or/and aural) feedback, and can not directly appreciate the 3Dness of the interaction object even with stereoscopy. This causes a drop in object presence because people are used to, for instance, observing objects in one's hand, rotating and manipulating them with physical contact. To alleviate this problem, this paper proposes a hand-held cubic screen, named TangibleScreen, on which the appearance of the target interaction object is projected. We choose the Relief Texture Mapping as the rendering method to correctly generate the viewer dependent textures to be projected on the non-planar surfaces of the TangibleScreen.

• Physical Therapy Korea
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• v.8 no.2
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• pp.87-94
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• 2001

Dexterity is defined in the present study as interdigital manipulative skill or the fine manipulative movements of objects held between the thumb and fingers. The Grooved pegboard test has been used to evaluate dexterity requring visual-motor coordination. The purpose of this study was to standardize the completion time of the Grooved pegboard test in different age groups and gender. Normative values for the Grooved Pegboard Test was developed on the sample of 282 healthy volunteers (89 men and 183 women). Subjects were stratified according to gender and dominant hand and were subdivided into six groups by blocking. The results of this study were as follows: 1) There was a significant difference in completion time between dominant and nondominant hand in both men and women groups (p<.05). 2) There were significant differences in completion time between men and women group (p<.05) 3) There were significant differences in completion time among age groups (p<.05).

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.476-479
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• 2003

Recently, Bluetooth has been regarded as a new technology for short-range wireless connection. Although initial application of Bluetooth technology has been focused mainly on replacing cables between hand-held devices due to a limited packet size and short-range, general wireless telecommunication such as PAN and Ad hoc networks via Bluetooth-equipped devices is expected to be one of the most popular applications. Wireless equipments have been used to exchange data between host and mobile unit. The exchanging data may be several bytes of control command and the value of sensors with ultra-sonic, vision sensor, and encoder from mobile robot. However, most wireless equipments have some drawbacks such as lack of authentication, large size and high price. On the other hand, the benefits of Bluetooth are small size, low power, low price except short-range. Especially, there are some difficulties when wireless modules are used in indoor environments. In this paper, a method of using wire network in Bluetooth network is investigated as a solution to overcome the short-range problem of Bluetooth and difficulty in indoor environment.