Hyeon-Cheol Lee

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N-Acyl phospholipids are atypical components of cell membranes that bear three acyl chains and serve as potential biosynthetic precursors for lipid mediators such as endocannabinoids. Biochemical studies have implicated ABHD4 as a brain N-acyl phosphatidylethanolamine (NAPE) lipase, but in vivo evidence for this functional assignment is lacking. Here, we(More)
Serine hydrolase inhibitors, which facilitate enzyme function assignment and are used to treat a range of human disorders, often act by an irreversible mechanism that involves covalent modification of the serine hydrolase catalytic nucleophile. The portion of mammalian serine hydrolases for which selective inhibitors have been developed, however, remains(More)
There will come someday when UAVs can fly into the airspace of manned aircraft in the near future because of the increasing number of operational UAVs together with technologies development. Since pilots of UAVs are on the ground, the equipment for sensing and avoiding obstacles in front is indispensable. In this paper, the TCAS II, a collision avoidance(More)
BACKGROUND Airway hyperresponsiveness (AHR) to direct stimuli, such as methacholine (MCh), is observed not only in asthma but other diseases. AHR to indirect stimuli is suggested to be more specific for asthma. The purpose of this study was to determine whether asthmatic airway inflammation is more closely related to AHR to hypertonic saline (HS), an(More)
The bacterial twin-arginine translocation (Tat) pathway is well known to translocate correctly folded monomeric and dimeric proteins across the tightly sealed cytoplasmic membrane. We identified a naturally occurring heterotrimer, the Escherichia coli aldehyde oxidoreductase PaoABC, that is co-translocated by the Tat translocase according to a ternary(More)
We introduce the image acquisition from X-band Inverse Synthetic Aperture Radar (ISAR) system using measurement instruments for chirp generation and signal modulation in this paper. We design and develop a power amplifier and a signal demodulator, but we use an Arbitrary Waveform Generator (N8241A, Keysight) for chirp generation and a Vector Signal(More)
We consider the calculating performance of a robust estimator for the variance of a generalized Gaussian distribution. In detail, we apply an unbiased ML estimator and a robust estimator for the variance of a Gaussian distribution to the variance of a generalized Gaussian distribution and calculate the mean square error. Then, we determine how the(More)
A SAR payload in Satellite transmits a ground station its SAR raw data by wireless datalink for post-processing, then the efforts of reducing its SAR raw data have been studied much. Vector Quantization (VQ) among these efforts is used much with block adaptive quantization. Due to heavy data search load of Vector Quantization between codebook and image(More)
We propose the study of robustness measures for signal detection in noise in conjunction with an empirical distribution approach. We compare stationary to non-stationary noise in the form of three samples/six dimensions and our approach shows that robustness is barely reduced by admitting non-stationarity. In addition, this paper shows that robustness(More)