Kwang-Yul Kim

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The principal mode of the seasonal variation of the Asian summer monsoon (ASM) and the temporal and spatial evolution of the corresponding synoptic fields are investigated via cyclostationary EOF analysis. This study uses the 21-year (1979-99) Xie-Arkin precipitation pentad data and National Center for Environmental Prediction daily reanalysis data focusing(More)
The impact of model microphysics on the relationships among hydrometeor profiles, latent heating, and derived satellite microwave brightness temperatures T B have been examined using a nonhydrostatic, adap-tive-grid cloud model to simulate a mesoscale convective system over water. Two microphysical schemes (each employing three-ice bulk parameterizations)(More)
We use the CSIRO-Mk3.6 coupled climate model to examine the impact of anthro-pogenic aerosols (AAs) and long-lived greenhouse gases (GHGs) on aspects of the global ocean circulation. Focusing on the second half of the twentieth century, we compare multiple ten member ensembles of historical climate change, which are forced by different combinations of(More)
From a system perspective, cost effectiveness and high-precision location information are important in wireless sensor networks (WSNs). Since a weighted centroid localization (WCL) algorithm can reduce hardware installation cost and guarantee localization accuracy, this algorithm is considered as one of the promising localization algorithms for WSNs. In(More)
Sea ice loss is accelerating in the Barents and Kara Seas (BKS). Assessing potential linkages between sea ice retreat/thinning and the region's ancient and unique social-ecological systems is a pressing task. Tundra nomadism remains a vitally important livelihood for indigenous Nenets and their large reindeer herds. Warming summer air temperatures have been(More)
Since conventional relay system is based on orthogonal two-phase transmission, where time slots for source and relay are exclusively allocated to avoid interference, the conventional relay schemes suffer from the reduction in spectral efficiency. In this paper, we propose cognitive radio (CR) based parallelized relaying scheme which maximizes spectral(More)
In cognitive radios, SUs (Secondary Users) coexist with PUs (Primary Users). The SUs detect those bands not used by the PUs through spectrum sensing, and transmit signals only within the limit not to interfere with the PUs. If we merely use the spectrum sensing information only in a cell with multiple PUs and SUs, the number of subcarriers that can be(More)