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신용희,정임국,이현주,신용철 한국농공학회 2019 한국농공학회논문집 Vol.61 No.1
Developing reliable soil moisture prediction techniques at agricultural regions is a pivotal issue for sustaining stable crop productions. In this study,a physically-based SWAP(Soil-Water-Atmosphere-Plant) model was suggested to estimate soil moisture dynamics at the study sites. ROSETTA was alsointegrated to derive the soil hydraulic properties( , , , , ) as the input variables to SWAP based on the soil information(Sand, Silt andClay-SSC, %). In order to predict the soil moisture dynamics in future, the mid-term TIGGIE(THORPEX Interactive Grand Global Ensemble) andlong-term S2S(Subseasonal to Seasonal) weather forecasts were used, respectively. Our proposed approach was tested at the six study sites ofRDA(Rural Development Administration). The estimated soil moisture values based on the SWAP model matched the measured data with the statisticsof Root Mean Square Error(RMSE: 0.034∼0.069) and Temporal Correlation Coefficient(TCC: 0.735∼0.869) for validation. When we predicted themid-/long-term soil moisture values using the TIGGE(0∼15 days)/S2S(16∼46 days) weather forecasts, the soil moisture estimates showed lessvariations during the TIGGE period while uncertainties were increased for the S2S period. Although uncertainties were relatively increased based onthe increased leading time of S2S compared to those of TIGGE, these results supported the potential use of TIGGE/S2S forecasts in evaluatingagricultural drought. Our proposed approach can be useful for efficient water resources management plans in hydrology, agriculture, etc.
신용희,이은정,임은순,정일원 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.1
Rice (Oryza sativa L.) is a very important staple crop, as it feeds more than half of the world’s population. Numerous studies have focused on the negative impacts of climate change on rice production. However, there is little debate on which region of the world is more vulnerable to climate change and how adaptation to this change can mitigate the negative impacts on rice production. We investigated the impacts of climate change on rice yield, based on simulations combining a global crop model, M-GAZE, and Coupled Model Intercomparison Project Phase 5 (CMIP5) multi-model projections. Our focus was the impact of mitigating emission forcings (representative concentration pathway RCP 4.5 vs. RCP 8.5) and autonomous adaptation (i.e., changing crop variety and planting date) on rice yield. In general, our results showed that climate change due to anthropogenic warming leads to a significant reduction in rice yield. However, autonomous adaptation provides the potential to reduce the negative impact of global warming on rice yields in a spatially distinct manner. The adaptation was less beneficial for countries located at a low latitude (e.g., Cambodia, Thailand, Brazil) compared to mid-latitude countries (e.g., USA, China, Pakistan), as regional climates at the lower latitudes are already near the upper temperature thresholds for acceptable rice growth. These findings suggest that the socioeconomic effects from rice production in lowlatitude countries can be highly vulnerable to anthropogenic global warming. Therefore, these countries need to be accountable to develop transformative adaptation strategies, such as adopting (or developing) heat-tolerant varieties, and/or improve irrigation systems and fertilizer use efficiency.
신용희,전효리,최문기,한억수,정성영 한국전자통신연구원 2013 ETRI Journal Vol.35 No.2
High-tech markets are unpredictable owing to rapid technology innovation, diverse customer needs, high competition, and other elements. Many scholars have attempted to explain the uncertainty in high-tech markets using their own various approaches. However, sufficiently clear ways to predict diverse changes and trends in hightech markets have yet to be presented. Thus, this paper proposes a new approach model, that is, systematic market segmentation, to give more accurate information. Using an empirical dataset from the mobile handset market in the Republic of Korea, we conduct our research model consisting of three steps. First, we categorize nine basic segments. Second, we test the stability of these segments. Finally, we profile the characteristics of the customers and products. We conclude that the approach is able to offer more diagnostic information to both practitioners and scholars. It is expected to provide rich information for an appropriate marketing mix in practice.
신용희 한국정보통신학회 2001 한국정보통신학회논문지 Vol.5 No.6
Recently the trends of telecommunications market is able to be explained by the shift of center from wire to and the rapid increase of data service. Not only all the world is tied one by emerging Internet and its fast spread, but also the degree of building If is the most important measure to evaluate national competence. In this point of view, next generation Internet is required for strengthening comparative advantage in industry and infrastructure in country. So in this paper, identifying the limitation of present Internet, and the concept of next generation Internet. Finally it is suggested in this paper that definition of optical Internet as next generation Internet of which technical situation and evolution direction, then provide to the implication for successful its establishment. 현재 정도통신시장의 추세는 유선의 무선화 현상과 데이터서비스의 급성장이라는 양축으로 압축하여 설명할 수 있다. 인터넷의 등장과 이의 급격한 파급은 전세계를 하나로 묶고 있고, 정보화 추 축의 정도가 국가의 경쟁력을 좌우하는 중요한 잣대가 되고 있다. 이러한 시점에서 통신 및 타 산업의 경쟁력 및 국가 기반의 체질적 강화를 위해서는 차세대 인터넷의 조기구축과 정착이 요구되고 있다. 따라서 본 논문에서는 현재 인터넷 환경의 변화를 살펴보고, 현재 인터넷의 한계와 문제점 을 질어된 후 차세대 인터넷의 개요를 파악하고자 한다. 그리고 차세대 인터넷의 대표주자격인 광인터넷의 정의와 기술현황 및 진화방향을 개괄해보고, 광인터넷의 성공적 구현을 위한 정책적 시사점을 조망해보고자 한다.
신용희,전효리,이명호 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.1
본 논문은 급변하는 정보통신 기술의 효율적 개발을 위한 진단적 정보의 제공을 목적으로 하고 있다. 즉 기술개발 전략을 제언하기 위한 선결작업으로써, 기술개발의 대상에 대한 직접적 분석과 전략에 대한 시사점을 제공하려 함이다. 따라서 본 논문에서는 기술의 유형 구분을 위한 양 설명축을 설정하고, 이에 따라서 기술의 유형을 구분하게 된다. 그 후 이상의 그룹 설정에 대한 타당성 검증을 위해 T-test 를 실시하고, 이 타당성을 바탕으로 판별분석을 실시하여, 기술유형의 구분을 위한 판별식을 도출하였다. 이 판별식을 통해 기업입장에서는 기술개발을 위한 기술의 효과적인 분석이 가능할 것이다.