• 대한공간정보학회지
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• 제15권4호
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• pp.51-58
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• 2007

대축척(1:50,000)지도의 산림 정보는 산림지역 보호에 중요한 자료로 이용된다. 그러나 대상지역인 인도 Tamil Nadu의 Eastern Ghats(EG) 지역에는 대축척 지도를 사용할 수 없기 때문에 위성 데이터를 이용한 산림의 변화 탐지를 적용하여 분석하였다. 대상지역의 1990년과 2003년의 산림의 변화에 대한 연구 결과 약 10가지의 산림종류가 관측되었으며 가장 변화가 큰 지역은 상록수와 낙엽수지역에서 관측되었다.

• 대한인간공학회지
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• 제31권4호
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• pp.567-575
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• 2012

Objective: The aim of this study is to get an optimal mental model by investigating user's natural behavior for controlling smart TV by mid-air gestures and to identify which factor is most important for controlling behavior. Background: A lot of TV companies are trying to find simple controlling method for complex smart TV. Although plenty of gesture studies proposing they could get possible alternatives to resolve this pain-point, however, there is no fitted gesture work for smart TV market. So it is needed to find optimal gestures for it. Method: (1) Eliciting core control scene by in-house study. (2) Observe and analyse 20 users' natural behavior as types of hand-held devices and control scene. We also made taxonomies for gestures. Results: Users' are trying to do more manipulative gestures than symbolic gestures when they try to continuous control. Conclusion: The most natural way to control smart TV on the remote with gestures is give user a mental model grabbing and manipulating virtual objects in the mid-air. Application: The results of this work might help to make gesture interaction guidelines for smart TV.

• Journal of Power Electronics
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• 제10권6호
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• pp.628-634
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• 2010

The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learning process is based on "Learning by Doing" paradigm supported by several learning tools: electronic course materials, interactive simulation, laboratory plants and real experiments accessed by Web Publishing Tools under LabVIEW. Built on LabVIEW and accompanied by a robust, flexible and versatile hardware, the experiment allows a comprehensive study by remote controlling and performing real measurements on the inverters. The study is offered in a gradual manner, according to the Leonardo da Vinci project EDIPE ($\b{E}$-learning $\b{D}$istance $\b{I}$nteractive $\b{P}$ractical $\b{E}$ducation) philosophy: theoretical aspects followed by simulations, while in the end the real experiments are investigated. Studying and experimenting access is opened for 24 hours a day, 7 days a week under the Moodle booking system.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.633-633
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• 2002

We investigated the distributions of sea ice using various microwave remote sensing techniques in the part of Drake passage, Antarctica, between the area 45-75$^{\circ}$W and 55-66$^{\circ}$S. We used Topex/Poseidon(T/P) radar altimeter, ERS-1 altimeter, ERS-2 scatterometer, Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), and DMSP Special Sensor Microwave/Imager(SSM/I) data. The sea ice distributions were estimated between May and Jun., 1995 and Oct. and Nov., 1998. The two altimeter measurements (T/P and ERS-1) showed good coherence with the results from the radiometer data in the given period when the ice concentration of 20% and greater was selected. The scatterometer data also showed good correlation with altimetry-implied sea ice surface. The maximum and minimum values of sea ice distribution were appeared in Aug. and Feb., respectively. In general, the sea ice distributions estimated from radar altimeter, radioneter, and scatterometer are well correlated.

• 대한공간정보학회지
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• 제17권3호
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• pp.3-12
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• 2009

지구상에서 가장 중요한 자원 중 하나인 토양은 지형조건에 따라 서로 다른 다양한 형태를 가지고 있기 때문에 최적화되고 지속 가능한 토양 자원의 활용을 위해서는 정확하고 포괄적인 정보가 필요하게 된다. 그러나 연구대상지역인 인도 Tamil Nadu지역의 경우 지형적인 영향으로 토양에 대한 정보가 많이 누락되어 있었다. 따라서 본 연구에서는Tamil Nadu 지역 Eastern Ghat의 Kolli Hill에 대한 지형 측량과 원격탐측을 통한 토양조사와 지도제작이 이루어졌으며 토양 샘플의 물리화학적 특성은 미국 농무부 (USDA) 기준에 따라 분석이 이루어졌다. 연구 결과로 토양을 5개의 대분류와 10개의 부분류로 구분할 수 있었으며 토양의 분포 특성을 보면 Entisol, Inseptisol 그리고 Alfisol의 세 계층 중 Entisol의 경우 전체 지역에 대하여 75%의 분포를 보였으며 5개의 대분류에 대해 Ustorthent 가 73% 로서 대부분 지역에 나타나고 있다. 또한 Lithic Ustorthents(40%), Typic Ustorthents(26%)의 분포를 나타내었다. 앞으로도 대상지역에 대한 토양자원에 대한 지속적인 연구가 요구되며 이를 통하여 토양에 대한 많은 정보를 활용할 수 있을 것이다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.72-74
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• 2003

Forest canopy density is an ideal representative of the forest habitat situations. It can directly or indirectly depict the canopy structure and gap size in the forestland, thus could be applied to assessment of wildlife’s diversit y. Since population survey of vegetation and wildlife diversities is a key issue for sustainable forest ecosystem management, many research efforts have been focused on forest canopy density using multispectral data in the last two decades. Unfortunately, prediction of canopy density using large scaling remote sensing data remains a challenging issue. Due to recent advances in hyperspectral image sensors hyperspectral imagery is now available for environmental monitoring. In this paper, we conduct experiments to monitor complicated environments of forestland that can be captured by using hyperspectral imagery and further be analyzed to test a prediction model of forest canopy density. The results show that 95% of canopy density could be well described by using 2 difference vegetation indices (DVIs), which are difference of blue and green reflectances rband_100-rband_150 and difference of 2 short wave infrared reflectancse rband_406-rband_410 With the wavelengths of band no. 100, 150, 406, and 410 specified by 462.39 nm, 534.40 nm, 918.22 nm and 924.41 nm respectively.

• 한국산학기술학회논문지
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• 제8권2호
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• pp.324-332
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• 2007

본 연구에서는 원격 실험실에서 사용될 수동소자인 저항, 인덕터, 캐패시터의 소자값을 원격으로 제어할 수 있는 소자를 개발하였으며, 이 소자를 이용한 회로이론 원격 실험실을 구현하였으며, 원격제어용 수동소자 R, L, C를 사용한 RLC 직렬회로 원격실험실의 예로 실험의 효용성을 보였다. 따라서 제안한 원격 실험실을 통해 학생들은 원격으로 다양한 소자값을 변경시켜가면서 실제 실험을 수행할 수 있게 되므로, 가상실험실이 안고 있는 실제 실험값을 얻을 수 없는 문제점을 해결할 수 있으며, 특히 학생 개개인이 실험할 수 없는 어떤 환경에서도 실험을 할 수 있는 환경을 제시하였다.

• Nuclear Engineering and Technology
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• 제36권4호
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• pp.346-356
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• 2004

14 Pressurized Water Reactors (PWR) in Korea use a remote monitoring system (RMS), which have been used in Korea since 1998. A Memorandum of Understanding on Remote Monitoring, based on Enhanced Cooperation on PWRs, was signed at the 10th Safeguards Review Meeting in October 2001 between the International Atomic Energy Agency (IAEA) and Ministry Of Science and Technology (MOST). Thereafter, all PWR power plants applied for remote monitoring systems. However, the existing method is high cost (involving expensive telephone costs). So, it was eventually applied to an Internet system for Remote Monitoring. According to the Internet-based Virtual Private Network (VPN) applied to Remote Monitoring, the Korea Atomic Energy Research Institute (KAERI) came to an agreement with the IAEA, using a Member State Support Program (MSSP). Phase I is a Lab test. Phase II is to apply it to a target power plant. Phase III is to apply it to all the power plants. This paper reports on the penetration testing of Phase I. Phase I involved both domestic testing and international testing. The target of the testing consisted of a Surveillance Digital Integrated System (SDIS) Server, IAEA Server and TCNC (Technology Center for Nuclear Control) Server. In each system, Virtual Private Network (VPN) system hardware was installed. The penetration of the three systems and the three VPNs was tested. The domestic test involved two hacking scenarios: hacking from the outside and hacking from the inside. The international test involved one scenario from the outside. The results of tests demonstrated that the VPN hardware provided a good defense against hacking. We verified that there was no invasion of the system (SDIS Server and VPN; TCNC Server and VPN; and IAEA Server and VPN) via penetration testing.

• 한국산학기술학회논문지
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• 제11권1호
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• pp.101-106
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• 2010

인터넷기술의 눈부신 발전으로, 대학 및 교육기관에서는 인터넷을 통하여 많은 e-learning 강좌를 제공하고 있어 시간과 거리상 제약을 받고 있는 많은 학생들에게 혜택을 주고 있다. 그럼에도 불구하고, 대부분의 웹기반 강좌는 공학기술교육의 필요성을 충족시킬 수 없었다. 본 논문에서는 산업 자동화 교육 훈련을 위한 웹기반 PLC 실험실의 설계와 구현을 제안하였다. 제안된 웹기반 PLC 실험실 시스템은 가상실험실과 원격실험실로 구성하였다. 웹기반 PLC 실험실은 많은 추가 비용 없이 교육의 질을 높이면서 등록된 학생들이 집에서 접속이 가능하다. 학생들은 웹 카메라의 도움으로 인터넷을 통하여 실제와 같은 PLC 실험을 보다 잘 경험 할 수 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.98-100
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• 2007

Tropical forests have variety of biodiversity values, which provide invaluable services to the living being on earth. In the recent years, tropical forests are regarded as valuable global resources that act as sink for carbon dioxide in order to mitigate global climatic change. In many parts of the world, tropical forests are being rapidly cleared by various means. Soil organic carbon (SOC) is concentrated in the upper 12 inches of the soil. So it is readily depleted owing to the degradation activities. In the present study, it was aimed to assess the magnitude of disturbance in the availability of SOC in a semi- evergreen forest, situated in the Eastern Ghats of Tamil Nadu, India. The forest density of this region was mapped with QuickBird satellite data. Intensive field soil sampling and floristic study were conducted to estimate the SOC status in different density classes and to identify the species availability. The SOC density ranged from 274.06 t/ha to 147.84 t/ha in the very dense and degraded semi-evergreen forest respectively. The SOC content was also varied from 3.70 to 1.83 % in the very dense semi-evergreen and medium semi-evergreen forests respectively. The species composition in different density classes was also varied considerably. As a result of this study, it was identified that the disturbance to forests by various means not only affect the density of forests but also affect the below ground SOC status proportionately.