• Proceedings of the Korea Water Resources Association Conference
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• 2002.05a
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• pp.123-127
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• 2002

• Proceedings of the Korea Water Resources Association Conference
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• 2003.05b
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• pp.631-634
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• 2003

• Proceedings of the Korea Water Resources Association Conference
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• 2003.05b
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• pp.635-638
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• 2003

• Proceedings of the Korea Water Resources Association Conference
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• 2003.05b
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• pp.639-642
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• 2003

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1032-1036
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• 2004

수자원계획수립시 가장 큰 문제점 중의 하나는 관심대상유역의 관측자료가 없는 경우이다. 이와 같은 미계측유역의 경우 통상 단순히 인근관측소 자료를 면적비로 전이시켜 사용하거나, 인근 계측유역에서 유출모형의 매개변수를 추정하여 매개변수를 전이시키는 방법을 사용하고 있다. 본 연구에서는 계측유역에서 추정한 장기유출모형의 매개변수를 미계측유역으로 전이시킬 때 유역별 토양수분보유능을 이용하여 보다 객관적으로 매개변수를 전이하는 방법을 제시하였다. 방법으로는 정교한 토양수분모의가 가능한 PRMS 모형을 이용하여 자료의 정도가 높은 5개 댐지점에서 매개변수를 검${\cdot}$보정한 다음, 소양강댐과 충주댐유역을 미계측유역으로 가정하여 계측유역의 토양수분보유능과 가장 유사한 유역에 매개변수를 전이하여 결과를 분석하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.157-159
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• 2001

인터넷 화상전화는 저렴한 가격으로 통신이 가능하게 하는 기술로 최근에 주목을 받고 있다. 인터넷은 제한적인 대역폭과 가변적인 손실을 나타내므로, 인터넷을 통해 전송되는 화상은 오류 전파에 의해 품질이 크게 떨어지게 된다. 일반적으로 화상은 움직임 예측, 보상기법을 이용하여 압축되기 때문에 한 프레임에서 발생한 오류가 그 프레임을 참조하는 프레임으로 전파되는 데 이를 오류 전파라고 한다. 기존의 오류 전파를 방지하는 기법에는 Error Tracking, NEWPRED, PFEC등이 있다. 본 논문에서는 인터넷 화상 전화에서 화상의 움직임이 적은 특성을 고려하여 Motion Vector의 중복전송을 이용한 PRMS기법을 제안한다. PFEC에 비해 부호화 효율을 높이면서 MB단위로 참조 프레임을 선택하여 오류 전파를 효과적으로 방지하는 기법이다. 실험을 통하여 PRMS기법이 기존치 PFEC나 NEWPRED에 비해 성능이 우수함을 보인다.

• Journal of Korea Water Resources Association
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• v.44 no.8
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• pp.683-694
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• 2011

To analyze the regional impact of air temperature increase and precipitation variation on water resources, the variability of precipitation-effectiveness (P-E) ratio which is estimated using precipitation and air temperature data of 59 weather stations operated by the Korean Meteorological Administration (KMA) during 1973~2009 was analyzed. Also runoff data resulting from the Precipitation-Runoff Modelling System (PRMS) modelling were analyzed during 1966~2007. The overall spatio-temporal variability of P-E ratio and runoff data in South Korea is corresponding to the variability of precipitation amount. However some region shows that the P-E ratio decreases even though the trend of precipitation amount increases which may be caused by the air temperature increase. Runoff trend is similar to that of P-E ratio. Precipitation and P-E ratio have decreased all seasons except summer season and it means the reduction of available water resources during those seasons. These variability should be reflected in the spring, fall, and winter water supply strategy.

• Journal of Korea Water Resources Association
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• v.43 no.10
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• pp.851-864
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• 2010

We investigated the sensitivity of Korean streamflows to climate variation. Historical dam inflows and climate data for eight multi-purpose dam sites were collected and examined to determine key factors affecting streamflow change. The results show that annual streamflow primarily responds to change in precipitation rather than temperature. However, the combination of less precipitation and high temperature induces a more serious decrease in streamflow than does similar precipitation and with low temperature. This result indicates that Korean water resources could be more vulnerable to drought due to increasing temperature caused by global warming. To estimate spatial differences in climate sensitivity, we also calculated climate elasticity for 109 mid-size watersheds using streamflow simulated by the Precipitation Runoff Modeling System (PRMS). Climate elasticity ranges over 1.5~1.9, indicating that a +20% increase in annual precipitation leads to a +30~+38% increase in annual streamflow.

• Journal of the Korean Association of Geographic Information Studies
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• v.11 no.3
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• pp.1-12
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• 2008

This study was to develop the analyzing system for watershed characteristics data. The developed system has laid the foundation for preparing the input data in various hydrological models. The algorithms and items included in the system were derived from benchmarking of the GIS WEASEL, which used to prepare the input data of PRMS (Precipitation-Runoff Modeling System). The system was designed to develop and maintain the organized system using both object-oriented UML (Unified Modeling Language) and GIS component-based ArcObjects.

• Nuclear Engineering and Technology
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• v.26 no.4
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• pp.555-561
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• 1994

The program of performing a fast and automatic analysis of gamma ray spectra obtained by a Multi-Channel Analyzer (MCA) is developed for the surveillance of the nuclear fuel integrity. The integrity of the nuclear fuel is confirmed by the measurement of the radiation level of the reactor coolant through the real time monitoring and the periodic sampling analysis. In Yonggwang nuclear power plane 3 and 4, the Process Radiation Monitoring System (PRMS), which is a real time monitoring system, provides a measure of the fuel integrity. Currently, its spectrometer channel can identify only one radionuclide at a time since the signal processing unit of the spectrometer channel is a Single Channel Analyzer (SCA). To improve the PRMS, it is necessary to substitute the MCA for the SCA The program is operated in a real time mode and an on-demand mode, and automatically performed for all procedures. The test results by using the National Bureau of Standards (NBS) mixed standard source are in good agreement with those from Canberra System 100 which is a commercial MCA Consequently, the developed program seems to be employed for automatic monitoring of gamma rays in nuclear power plants.