Jun-Bae Lee

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This paper represents a novel short-circuit detecting scheme using turn-on switching characteristic of IGBT. The proposed scheme has a simple protection circuit, fast fault detection time, and low-cost devices to protect IGBT under short-circuit faults such as fault under load (FUL) and hard switching fault (HSF). The proposed short-circuit detecting scheme(More)
Optical properties and molecular composition of humic substances (HS) can provide valuable information on the sources and the history of the associated biogeochemical processes. In this study, many well-known spectral and molecular characteristics were examined in eight different HS samples, which were extracted from soils and sediments located in a(More)
Many drinking water supplies are located in forested watersheds, which operate as an important source of dissolved organic matter (DOM). In this study, monthly sampling campaigns were conducted from a reservoir (Daecheong Reservoir, South Korea) and its forested tributaries for five consecutive months (June to October) to examine the variations of DOM(More)
Direct injection and solid-phase extraction methods for the determination of diquat and paraquat in surface and drinking water were developed using liquid chromatography with tandem mass spectrometry. The signal intensities of analytes based on six ion-pairing reagents were compared with each other, and 12.5 mM nonafluoropentanoic acid was selected as the(More)
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