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A Survey on content-oriented networking for efficient content delivery
Jaeyoung Choi,Jinyoung Han,Eunsang Cho,Kwon, Ted,Yanghee Choi IEEE 2011 IEEE communications magazine Vol.49 No.3
<P>As multimedia contents become increasingly dominant and voluminous, the current Internet architecture will reveal its inefficiency in delivering time-sensitive multimedia traffic. To address this issue, there have been studies on contentoriented networking (CON) by decoupling contents from hosts at the networking level. In this article, we present a comprehensive survey on content naming and name-based routing, and discuss further research issues in CON. We also quantitatively compare CON routing proposals, and evaluate the impact of the publish/subscribe paradigm and in-network caching.</P>
Does AMSR2 produce better soil moisture retrievals than AMSR-E over Australia?
Cho, Eunsang,Su, Chun-Hsu,Ryu, Dongryeol,Kim, Hyunglok,Choi, Minha Elsevier 2017 Remote sensing of environment Vol.188 No.-
<P><B>Abstract</B></P> <P>The Advanced Microwave Scanning Radiometer 2 (AMSR2), a follow-up microwave sensor to the AMSR for Earth Observing System (AMSR-E), was launched on the Global Change Observation Mission 1 – Water (GCOM-W1) satellite in May 2012. It is as yet unclear if instrumental improvements in AMSR2 over AMSR-E have led to better soil moisture (SM) estimates, especially since there is no overlapping period of data between the sensors. This study focuses on comparing the results of AMSR2 and AMSR-E SM over Australia, distinguishing four Köppen climate zones to determine if AMSR2 is better than AMSR-E. This is achieved by selecting two year-long comparative time periods from the operating periods of AMSR-E and AMSR2, based on their statistical similarities in modeled SM as a proxy, using Modern Era Retrospective-analysis for Research and Applications-Land (MERRA-L). The AMSR2 and AMSR-E C- and X-band SM derived from the Land Parameter Retrieval Model (LPRM) was evaluated. Both AMSR2 C- and X-band SM products were found to show similar temporal patterns and spatial agreement with AMSR-E C- and X-band SM, supported by unbiased root mean square difference (ubRMSD) and R-values with MERRA-L SM, respectively. Using lag-based instrumental variable analysis to estimate the random error component of SM retrievals, the noise-to-signal ratios in AMSR2 X-band SM were found to be slightly higher than their AMSR-E counterparts. The improvements in AMSR2, such as the superior radiometric sensitivity and spatial resolution, have therefore not led to statistically significant differences in performance for LPRM retrievals at 1/2°×1/2° grid resolution, when compared with AMSR-E. However, similarities in the metrics for AMSR2 and AMSR-E SM suggest that AMSR2 provides a valuable continuation to AMSR-E.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Revised the manuscript to reflect several specific comments carefully </LI> <LI> Clearly improved in textual and structural things </LI> <LI> Proofread thoroughly by a native English colleague </LI> </UL> </P>
Cho, Eunsang,Zhang, Aoqi,Choi, Minha Chinese Geoscience Union 2016 TAO Vol.27 No.6
<P>This study focuses on the seasonal differences in soil moisture patterns considering the impact of meteorological variables (air/ground temperature, precipitation, and the amount of insolation) on soil moisture variability over the Korean peninsula between January 2012 and February 2013. We found that soil moisture spatial distributions changed differently with the mean soil moisture content according to the season using statistical metrics (skewness and kurtosis) (summer: 1 June to 31 August, winter: 1 November to 31 January). Daily variations in meteorological variables had different relationships with the changes in soil moisture for two seasons. Air and soil temperature changes clearly had negative relationships with the soil moisture change during the summer period while they had positive relationships during the winter period. Temporal stability testing showed that the representative soil moisture sites on a regional scale could be changed with seasonal periods, especially in the Asian monsoon region. In conclusion, these results provide evidence that there are clear differences in soil moisture patterns according to seasonal characteristics. This study might be useful for further researches relating to climate-meteorological effects on soil moisture patterns on a regional scale.</P>
유은상(Eunsang Yu),마종현(Jonghyeon Ma),최중식(Jungsik Choi) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.4
BIM-related policies are steadily being introduced in the construction industry. The 2030 architectural BIM activation roadmap includes BIM automation technology and intends to apply it to the design system certification system. Design certification evaluation is conducted with 2D drawings, and additional research is needed because certification evaluation using BIM technology is insufficient. In this study, a study for design certification automation application was conducted by analyzing the design certification system and BIM data. Design certification system analysis, cases and research trends were investigated, and BF certification was carried out first in various systems. Evaluable areas were classified using BIM data, and applicability was reviewed using IFC, which is BIM information. Based on BIM, a system for reviewing and evaluating items within the evaluation range was partially implemented. Through this study, the efficiency of work can be improved and reliable evaluation can be obtained by automating additional work for certification in the design certification stage.