• Journal of Wetlands Research
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• v.13 no.3
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• pp.603-611
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• 2011

In order to enhance cutting efficiency of reed culms, we had assessed diverse methodology in cutting and applied better conditions among them into three vigorous eco-types of common reed. From the results, differences in a eco-type, a sampling area in reed population and substrata affected the shoot emergence slightly. On the other hand, differences in a type of burying culms and a burying part among whole culm affected shoot emergence strongly. Our results suggest that not only methodological condition but also appropriate kind of eco-types must be considered in using reed culms for better cutting. In addition that, sampling timing according to the geological and climatic condition of certain area should be considered for better cutting efficiency as well. We also recommend that the sampling area such as expanding area in a population, burying a middle part of the culm, substratum such as well-ventilated sand and vertical burying method for better cutting efficiency. Lastly, for more enhancement of cutting efficiency of reed culms, potential damages by blight and harmful insects such like aphids should be concerned very carefully.

• Korean Journal of Plant Resources
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• v.23 no.1
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• pp.38-46
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• 2010

Phenolic compound contents and scavenging activity on DPPH and ABTS radicals in twelve fern species were studied by analysing ultrasonification extraction of dried aerial parts and rhizomes using methanol solvent. Total polyphenol content ranged from 2.97 to 140.1 mg per 1 g dried sample and 0.80 to $49.58\;mg{\cdot}g^{-1}$ fresh sample. Highest polyphenol content was obtained with aerial part of Davallia mariesii and Polystichum lepidocaulon. Total flavonoid content of dried sample was $2.56{\sim}34.91\;mg{\cdot}g^{-1}$ and fresh sample $0.71{\sim}11.49\;mg{\cdot}g^{-1}$. Higher flavonoids were obtained with dried aerial part of Dryopteris crassirhizoma, but with fresh aerial part of P. lepidocaulon. In general, total polyphenol content was higher in rhizomes, except in case of total flavonoid. Scavenging effects on DPPH and ABTS radicals was higher with rhizome extracts compared to aerial parts. The rhizome of Polystichum polyblepharum showed highest effects on both radicals. However, the amount of fresh sample for $RC_{50}$ with consideration of water content and extraction yield. P. lepidocaulon aerial part was more advantageous than P. polyblepharum rhizome. All the fern extracts except for the Coniogramme japonica extract demonstrated superior scavenging effects on ABTS radicals, being similar activity of ascorbic acid and BHT.

• Broadcasting and Media Magazine
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• v.23 no.1
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• pp.26-32
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• 2018

본 고에서는 지상파 8K UHD 방송 통신 융합 서비스 기술을 소개한다. 8K UHD 서비스를 위한 최근 동향을 살펴보고 지상파 방송에서도 8K UHD 서비스 할 수 있도록 제안된 방송 통신 융합 시스템을 소개하고자 한다. 방송망과 통신망에서 동시에 전송할 수 있는 MMT(MPEG Media Transport) 기술과 차세대 비디오 코덱인 SHVC(Scalable High-efficiency Coding) 기술을 살펴본다. 그리고 이 기술들이 적용된 8K 방송 통신 융합 송수신 시스템과 서비스 기술을 소개하고 향후 지상파 방송의 새로운 방송 서비스로 방송 통신 융합 서비스의 가능성을 제시하며 마무리 짓는다.

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.33-36
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• 2007

토지피복분류， 식생분류， 식물피복도 분류 등 원격탐사 영상자료의 주된 이용분야에서 지상자료는 매우 중요한 부분을 차지하고 있다. 가령 감독분류를 위한 training site 에 대한 측정이나 또는 분류 정확도 검증을 위한 측면에서도 지상측정은 반드시 필요한 부분이다. 본 논문에서는 피복분류 과정에서 반드시 필요한 지상측정을 위한 표본조사에서 유의하여야 할 통계학적 측면에서 고려해야 할 사항을 검토한다.

• Broadcasting and Media Magazine
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• v.4 no.4
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• pp.29-37
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• 1999

우리나라는 금년 5월부터 KBS를 시작으로 방송 3사에서 지상파 디지털 TV 실험방송을 실시하고 있다. 이에 따라 정보통신부에서는 기존의 NTSC TV 방송의 효율적인 디지털 방송으로의 전환을 지원하기 위해 지상파 디지털 TV 실험방송 전담반을 구성하여 방송사와 국책 연구소 그리고 관련 업체 대부분이 참여한 가운데 DTV 송출, 송수신 정합, 필드테스트 등을 수행하고 있다. 본 논문에서는 현재 실험방송 전담반에서 작성, 계획중인 우리나라의 지상파 DTV 필드테스트에 대하여 서술한다.

• The Korean Journal of Air & Space Law and Policy
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• v.20 no.1
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• pp.87-107
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• 2005

Land Remote Sensing' is defined as the science (and to some extent, art) of acquiring information about the Earth's surface without actually being in contact with it. Narrowly speaking, this is done by sensing and recording reflected or emitted energy and processing, analyzing, and applying that information. Remote sensing technology was initially developed with certain purposes in mind ie. military and environmental observation. However, after 1970s, as these high-technologies were taught to private industries, remote sensing began to be more commercialized. Recently, we are witnessing a 0.61-meter high-resolution satellite image on a free market. While privatization of land remote sensing has enabled one to use this information for disaster prevention, map creation, resource exploration and more, it can also create serious threat to a sensed nation's national security, if such high resolution images fall into a hostile group ie. terrorists. The United States, a leading nation for land remote sensing technology, has been preparing and developing legislative control measures against the remote sensing industry, and has successfully created various policies to do so. Through the National Oceanic and Atmospheric Administration's authority under the Land Remote Sensing Policy Act, the US can restrict sensing and recording of resolution of 0.5 meter or better, and prohibit distributing/circulating any images for the first 24 hours. In 1994, Presidential Decision Directive 23 ordered a 'Shutter Control' policy that details heightened level of restriction from sensing to commercializing such sensitive data. The Directive 23 was even more strengthened in 2003 when the Congress passed US Commercial Remote Sensing Policy. These policies allow Secretary of Defense and Secretary of State to set up guidelines in authorizing land remote sensing, and to limit sensing and distributing satellite images in the name of the national security - US government can use the civilian remote sensing systems when needed for the national security purpose. The fact that the world's leading aerospace technology country acknowledged the magnitude of land remote sensing in the context of national security, and it has made and is making much effort to create necessary legislative measures to control the powerful technology gives much suggestions to our divided Korean peninsula. We, too, must continue working on the Korea National Space Development Act and laws to develop the necessary policies to ensure not only the development of space industry, but also to ensure the national security.

• TTA Journal
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• s.94
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• pp.39-46
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• 2004

• 베이커리
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• no.7 s.408
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• pp.126-129
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• 2002

• Journal of IKEEE
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• v.15 no.1
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• pp.104-112
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• 2011

During the ground operation of Korean army, the voice message is mainly used for exchanging informations related to the surveillance and reconnaissance, command and control, and precision strike. However, in order to the battlefield visualization among fighting powers participating in the ground force operation, automatic situational awareness and variable message format (VMF) for command and control are required. For securing core technologies necessary for the battlefield visualization, message standard and message handler are established through several applied researches. Besides, the VMF for equipping a weapon system is in development. In this paper, a study on the Korean variable message format (KVMF), where interoperability of integrated battle management system (BMS) is guaranteed due to performing joint, ground, and combined operations so that the situation awareness and strike system can be automated in almost real time, is presented. From the modeling and simulation (M&S) results of the message processor, delay time is varied in accordance with the number of nodes in unit platoon network, message length, and generation interval of routine messages. Therefore, it is shown that the system performance can be optimized by establishing proper network protocol for each situation.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.139-140
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• 2008

지상라이다는 고정도의 3차원 영상을 제공하고 레이저 빔을 현장이나 대상물에 발사하여 짧은 시간에 수백만점의 3차원좌표를 기록할 수 있는 최신 측량장비로서 다양한 응용분야에서 두각을 나타내고 있다. 본 연구에서는 지상라이다를 이용한 건축물의 3자윈 자동 윤곽선 추출을 다룬다. 지상라이다는 건축물의 3차원 윤곽선을 신속하게 추출할 수 있지만 지상기반 시스템이므로 여러 가지 장애물 때문에 건국물의 하단부에서는 추출이 쉽지 않다. 기존 항공라이다를 이용한 알고리즘에서는 사진의 색상차나 모폴로지 특성에 의존하여 범위를 제한하고, 이를 기반으로 윤곽선을 추출하였다. 하지만 지상라이다의 경우 항공라이다에 비해 분해능이 월등히 높다. 또한, 지상라이다는 지상에서 측정하기 때문에 항공라이다에서 어려운 건축물의 측면이나 정면도 윤곽선 추출이 가능하기 때문에 본 논문에서는 사진을 이용하지 않고 전처리를 하지 않은 데이터를 직접 이용하여 건물의 정면 윤곽선을 추출하는 것을 제안한다. 건물의 크기와 데이터 수 즉, 라이다로 측정한 포인트 수를 고려한 효율적인 Decimation방법을 제안하고 또한, Decimation된 데이터이서 지역적으로 제일 큰 값과 작은 값을 찾아낸다. 그 중 많이 벗어난 점을 편차를 이용하여 제거한다. 이렇게 찾아낸 건축물의 외곽점들을 이어 만든 윤곽선을 최종적으로 보간하여 좀 더 현실과 가까운 윤곽선 추출 방법을 제안한다.