• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.9 no.1
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• pp.97-107
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• 1991

This paper was suggested the detailed methods on the integration of Remote Sensing and GIS for various application of two functions at the one system with making the most use of respective merits rather than make use of independent systems. It developed of algorithm about simultaneous overlay of raster and vector data for remote sensing and GIS for these objects. For test application on integration of remote sensing and GIS, it used of remote sensing data of satellite and used to topographic map of the same area for vector data acquisition of GIS application. For the practical application, it proved of effective value of integration of raster and vector data by present of useful technique with multilateral approach method through data conversion about thematic application for major application fields of remote sensing and GIS and it suggested that new application technique for integrated application of remote sensing GIS through synthetic situation analysis.

• Journal of Korea Water Resources Association
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• v.49 no.2
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• pp.83-94
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• 2016

Geomorphological, bed material and hydraulic characteristics are basis informations for the planning, design and management of the river in the aspect of flood control and environmental conservation, and it is very important to use these informations for the design of stable channel. In this study, dominant discharge was selected, geomorphological and hydraulic characteristics were analyzed using that discharge and also the characteristics of bed materials distribution were analyzed and bed materials-flow resistance relationship was evaluated, for the upstream section of Namgang dam. The dominant discharge was estimated a return period of approximately 1.5 year and stream type were classified Segment 1 and Segment 2 in this stream. Also, the frequency of riffle-pool showed 4.4 because this study area has the characteristics of natural channel that have not channel-crossing structures. In dominant discharge, according to the results that analyzed relationship between $h/d_{50}$ and $V/u_*$ to calculate flow resistance by bed materials, Julian's formula showed to appropriate in channel where is relatively close to natural river and is predominantly consisted of gravel, cobble, boulder and rock in mountain, and it was confirmed that the image processing methodology will be easily applied to the analysis of bed materials distribution in future.

• Journal of Korean Society for Geospatial Information Science
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• v.6 no.2 s.12
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• pp.105-117
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• 1998

The main object of this study was to prove the effectiveness of satellite Image data for extraction of the pine needle gall midge damaged area in the part of Kangwon-do area, and to present the detailed procedure of a digital image processing for extraction of those damaged area. The effectiveness of extraction of damaged area was improved by using the BRCT(Backwards Radiance Correction Transformation) with DEM for the normalization of topographic effects. The topographic surface analysis of the extracted damaged area revealed that the general damaged area was at south-west and south-east aspect with the slope of 31 to 38 degrees, the temperature of 21 to 25, and 23% to 39% of the highest altitude mountains. The new damaged area in which expanded area was at 27 to 30 degree of slope, the aspect of 46 to 180 degrees, the temperature of $11^{\circ}C\;to\;12^{\circ}C$ and 27% to 39% of the highest altitude mountains. The NDI(New Damaged Index) was developed using the environment factor and simple vegetation index.

• Journal of the Korean Association of Geographic Information Studies
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• v.2 no.2
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• pp.79-86
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• 1999

This study was carried out to estimate the area of damaged forest and the volume of stand tree in burned area, Mt. Weol-A in eastern Chinju, Korea using digital maps derived from supervised classification of Landsat thematic mapper(TM) imagery as reference data. Criterion laser estimator and WinDENDRO$^{tm}$(v. 6.3b) system as a computer-aided tree ring measuring system were used to measure a volume and age of sampled tree. The sample site had been chosen in unburned areas having the same terrain condition and forest type of burned areas. The tree age, diameter at breast height, tree height and volume of the sample tree selected from sample site in unburned area were 27years, 20.9cm, 9.7m and $0.1396m^3$ respectively. Total stand volume of sample site was estimated $2.9316m^3$/0.04ha, Damaged stand volume evaluated to about $16,007m^3$ in the burned area of 218.4ha.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.1
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• pp.54-62
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• 2009

The present study investigates the behaviour of overtopping flows falling on the leeside of a caisson breakwater with dissipating blocks through laboratory measurements. The falling overtopping flows in the leeside are expected to directly affect the leeside stability of the breakwater. This study focuses on not the resultant stability but the characteristic pattern of the overtopping flows depending on wave conditions through examining front velocity and plunging distance in the leeside. Regular waves were used to investigate the dependence of the overtopping flow pattern on wave conditions and a modified image velocimetry combining the shadowgraphy and cross-correlation method was employed for measurements of image and velocity. From the measurements, it is shown that the plunging distance and front velocity of the overtopping flow in the breakwater leeside increase as the wave period or height increases. From non-dimensional relationships between the variables, empirical formula for the velocity and overtopping distance are suggested.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.05a
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• pp.152-155
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• 1999

ATM은 다양한 종류의 실시간 및 비실시간 트래픽을 지원할 수 있도록 기존의 회선 교환망과 패킷 교환망의 장점을 수용하여 셀이라는 일정한 크기의 패킷을 비동기식 시분할 방식으로 전송하는 방식이다. 이와 같은 ATM은 STM가 달리 대역폭의 효율적인 할당이 가능하므로 기존의 망에서 다루고 있는 데이터 통신 서비스 외에도 고화질의 화상이나 동영상, 멀티미디어 트래픽 제어는 실시간 접속에 대한 서비스 품질(QoS)의 보장이 요구되므로 본 논문은 망내에서 트래픽 왜곡과 CBR/VBR 접속에 대한 트래픽의 일반적 패턴과 셀 큐잉 지연 범위를 획득하여 최악의 규잉 분석을 모델링할 수 있는 비트 스트림 트래픽 모델에 기반을 둔 트래픽 제어 기법이 비트 스트림 제어 알고리즘을 제안한다. 제안된 알고리즘은 정적 우선순위스케줄링과 FIFO 큐잉 스위치를 갖는 ATM 망에서 엄격한 실시간 통신 서비스를 제공할 수 있다.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.5
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• pp.609-619
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• 1999

본 논문은 멀티캐스트 통신환경의 관리 문제들을 해결하기 위한 통합관리 플랫폼(IPME)을 기술한다. IPME는 멀티캐스트 통신환경을 관리하기위해서 전형적인 망 관리 기법을 적용하여 기존의 멀티캐스트 환경의 문제들을 해결하기위한 플랫폼이다. 본 논문은 멀티캐스트 통신환경의 문제점을 분석하고, 관리플랫폼의 구현을 위한 설계시 고려 요건들을 기술한다. 또한 이를 기반으로 멀티캐스트 통신환경을 통합관리하기 위한 관리플랫폼의 구조를 제안한다. 제안된 구조를 검증하기 위해서 IPME는 멀티캐스트 통신환경에서 중요한 문제로 대두되고있는 다자간 응용에 대한 서비스 질의 관리 구조 (IPME-QoS) 로 확장된다. 확장의 IPME-QoS 의 구현을 위해서 제공 서비스 정의, 구성 모듈들의 설계, QoS 설정단계, QoS 관리 정책 알고리즘 및 관리구조 등을 구체적으로 기술한다. IPME-QoS 의 타당성을 검증하기 위해서 최근 멀티캐스트 통신환경 서비스를 이용하는 대표적인 응용인 화상회의 시스템의 QoS관리에 적용한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.7A
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• pp.766-774
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• 2004

The future mobile communication system can support not only voice but also multimedia applications such as data, image and video. It requires greater resources than the voice-oriented mobile system. Efficient resource reservation and hand-over schemes are necessary to maintain the same QoS of transmitted multimedia traffic because the QoS may be defected by some delay and information loss during hand-over. This paper proposes a resource reservation scheme to accommodate multimedia traffics in mobile multimedia networks. In our scheme the position of mobile is estimated in two steps, that is, sector estimation and zone estimation. With this position information, the moving direction is determined. According to simulation results, our scheme provides a better performance than conventional methods.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.8
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• pp.1683-1690
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• 2005

This study examines dynamic flow control method in UDP, analyzes packet loss which is frequently used element in measuring existing dynamic flow control and characteristics of round trip time, and proposes a new method of measurement, RSST. The algorithm that uses the proposed RSST enables accurate measurement of network status by considering both the currently measured network status and the past history of network status in controlling the transmission rate. For comparison study, a network status measurement software program that displays detailed information about volume of transmission generation of network status, and flow pattern of network was developed. The performance test shows that the proposed algorithm can better adjust to network condition in terms of low pack loss rate over existing algorithms.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.146-149
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• 2005

Confusion of network traffic is increased by increasing of internet user and large of network, Specially olded one and one communication caused loss of bandwidth because of redundant packet by increasing video conference and internet broadcasting. Thereupon multicast technique, method reducing loss of bandwith, for multimedia data transmission was proposed. This paper proposes method to solve overhead problem in the middle router through group management and capsuling with the Xcast technique added Disignated Router(DR). To solve the middle router not supporting IPv6, Xcast using tunneling technique in the IPv6 design and analyze the performance through a simulated examination.