• Journal of Bio-Environment Control
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• v.21 no.3
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• pp.213-219
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• 2012

Improving the physico-chemical properties of used media by mixing ratio of new plug media (NPM), used plug media (UPM) and perlite is necessary to improve seedling quality. In this study, five treatments were designed to investigate mixing ratio of UPM and NPM by ratio of volume 0 : 100, 25 : 75, 50 : 50, 75 : 25, 100 : 0, respectively. On the other hand, nine treatments were designed to investigate of perlite volumes were added to UPM and mixed media (UPM : NPM (50 : 50)) with 0, 5, 10, and 20% of ratio volume. The physicochemical properties of all mediums and their effect on growth response of tomato and cucumber seedlings were determined. The result indicates that physical properties was improved when NPM was mixed with UPM and at mixed ratio of volume 50 : 50 (v : v) has similar pore spare, bulk density and water retention to NPM. Seedling quality of tomato and cucumber in mixed media (50 : 50) are better than other mixed ratio and similar to NPM. Addition perlite to UPM and mixed media 50 : 50 (v : v) increased the pore space and water retention. Physical properties such as particle density, pore space and bulk density were increased when perlite volume increased. However, the best of seedling quality was observed by the addition at 10% volume of perlite. These results suggested that optimum of mixed ratio for recycled used media is new media and used media 1 : 1 mixed.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.804-809
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• 2004

Intelligence is thought to be related to interaction rather than a deep but passive thinking. Interactive tangible media "iT_Media" is proposed to explore these issues. Personal robotics is a major area to investigate these ideas. A new design methodology for personal and emotional robotics is proposed. Sciences of the artificial and intelligence have been investigated. A short history of artificial intelligence is presented in terms of logic, heuristic, and mobility; a science of intelligence is presented in terms of imitation and understanding; intelligence issues for robotics and intelligence measures are described. A design methodology for personal robots based on science of emotion is investigated. We investigate three different aspects of design: visceral, behavioral, reflective. We also discuss affect and emotion in robots, robots that sense emotion, robots that induce emotion in people, and implications and ethical issues of emotional robots. Personal robotics for the elderly seems to be a major area in which to explore these ideas.

• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.107-110
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• 2004

IEEE 802.15.3 is wireless Medium Access Control(MAC) and Physical Layer(PHY) specification for high rate WPAN (Wireless Personal Area Network). IEEE 802.15.3 MAC Layer provides Qos with three kinds of acknowledgements; No acknowledgement, Immediate acknowledgement, and Delayed acknowledgement. This paper presents how to improve QoS with new acknowledgement method called Delayed Negative acknowledgement. This paper describes the method of using Delayed Negative acknowledgement and presents the calculation of QoS improvement by using Delayed Negative acknowledgement.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.3 no.1
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• pp.19-28
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• 1973

The author has studied maxillo-facial anatomical landmarks using Status X with two methods. The one has performed by application of contrast media on the human dry skull, the other has performed on living human skull as control group. Comparing the panagraphs taken by two methods, the author has drawn following results: 1. The panagraphs revealed the undistorted, highly sharp panoramic shadows of each jaw on a film. 2. Diminishing the inserted anode tube overlapping-free representation of the anterior teeth was taken. 3. Alternating the head position of the objects, direction of anode tube and film placing, the shadows of temporo-mandibular joint and zygomatic arch were taken without overlapping the other bone tissues. 4. In the panagraphs applied various shaped contrast media to each anatomical landmark, a radio-anatomical atlas which is necessary to interpret various bone tissues was taken. 5. In order to interpret panagraphic shadows easily, the author has tried this study by comparing the films of the living human skull with the films of the human dry skull applied contrast media.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.214-220
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• 2009

Recent advanced technologies enable multiple users to share the virtual environment and work together as they are collocated. Additional sensory information such as haptic could improve the cooperation. In this paper, we propose a server-client architecture with multi-rate haptic control to support a tangible cooperation. Using our approach, the system is able to maintain a consistent simulation state across multiple users as well as to provide a highfidelity stable haptic interaction. To verify our approach, we have developed an experimental application and tested the cooperation among multiple users. The results confirm that our system is able to provide coherency among clients as well as haptic transparency.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.245-248
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• 2004

본 논문에서는 텔레비전 수신기에서 채널 변경에 따른 음량 자동 보정 방법에 대해서 기술하고자 한다. 지금까지 텔레비전 수상기에서는 사용자가 방송 채널을 전환하는 경우 각 방송 채널마다 음량 레벨이 조금씩 다르다는 것을 느끼게 된다. 그러므로 이러한 채널 변경에 따른 음량 변화를 조정하기 위해 청취자가 리모컨으로 볼률을 조절하는 불편함을 줄이기 위해 자동으로 음량 변화를 보정하는 것이 요구된다. 본 논문은 채널 변경에 따른 음량 변화와 Dynamic Range 가 너무 큰 오디오 신호에 대해 자동으로 음량을 보정함으로써 청취자가 볼륨을 조절하는 불편함을 줄이는 자동 음량 보정 알고리즘을 제안하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1911_1912
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• 2009

본 논문에서는 증강현실(Augmented Reality, 이하 AR)을 이용한 PLC 기술교육 시스템을 제안하였다. 제안된 시스템은 PLC 기술 교육 과정을 교사의 지도없이 교육생 스스로가 습득할 때까지 반복 실습이 가능한 시스템이다. 또한, 제안된 시스템은 기초적인 내용의 실습을 3단계로 구성하여 제공함으로써, 각 실습단계의 장비 사용법과 배선 방법이 포함된 교육 내용을 교육생이 자유롭게 실습하도록 하였다.

• BMB Reports
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• v.32 no.1
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• pp.25-27
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• 1999

Otitis media with effusion (OME) is an inflammatory disease of the middle ear cleft. Oxygen free radicals have been implicated in a variety of inflammatory disorders. Oxygen free radicals may also be involved in the pathogenesis of OME. To evaluate the involvement of oxygen free radicals in the pathogenesis of OME, the level of malondialdehyde, which gives an index of lipid peroxidation by oxygen free radicals, was measured by the reaction with thiobarbituric acid. Malondialdehyde level in the middle ear fluid from the OME group was higher than that in the normal control group. Malondialdehyde level in the middle ear fluid from a mucoid subgroup was higher than that in the serous subgroup. Malondialdehyde levels in the middle ear fluid from the serous subgroup was significantly correlated with symptom duration. The Pearson correlation coefficient between malondialdehyde levels in the middle ear fluid from the serous subgroup and symptom duration was 0.842 (P<0.05). These results indicate that lipid peroxidation by oxygen free radicals may be involved in the pathogenesis of human OME.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.94-95
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• 2017

최근 디지털 사이니지의 가격의 하락과 기술의 발달로 유명 관광지에서 정보전달을 위해 아날로그형 간판에서 디스플레이 등을 사용한 디지털 사이니지로 전환하고 있으며, 그 중 세로형 디지털 사이니지인 키오스크를 활용한 간판이 증가하고 있다. 하지만 키오스크의 경우 보통 내장되어 있는 콘텐츠만을 제공하는 경우가 많아 콘텐츠를 관리하고 변경하기 위하여 불가피하게 인력과 시간이 소요되며, 원격에서 콘텐츠 제어가 가능하더라도 콘텐츠를 제어하는 동안 리소스 문제로 인해 키오스크의 사용이 중단될 수 있다. 이에 본 논문에서는 독립형 키오스크에서 콘텐츠를 표출하고 있으며 동시에 원격에서 콘텐츠를 제어/관리 할 수 있는 비동기식 콘텐츠 제어 기법에 대하여 제안하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.719-721
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• 2016

본 논문에서는 프로젝션 맵팽 시에 요구되는 다양한 장비와 기술에 대한 학습시간을 최소화하여 초보자도 빠른 시간 안에 정교하면서도 다양한 연출이 가능한 맵핑 작업을 할 수 있도록 프로젝션 맵핑 프레임워크를 제안하였으며, 역동적인 연출을 위해서 여러 개의 비디오 클립을 동적으로 디스플레이하는 형태를 보다 쉽게 정의하고 수행할 수 있도록 하는 프레임워크를 설계하였다. 제안 프레임워크에서 구성 파일의 몇 가지 속성값을 간단히 변경하는 것만으로 다중 비디오 클립을 이용한 다양한 형태의 동적 디스플레이를 모드를 연출 할 수 있었다.