Byoung-Wook Choi

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The efficient compression of radiographic images is of importance for improved storage and network utilization in support of picture archiving and communication systems (PACS) applications. The DICOM Working Group 4 adopted JPEG2000 as an additional compression standard in Supplement 61 over the existing JPEG. The wavelet-based JPEG2000 can achieve higher(More)
AIMS High calcium (Ca), phosphate (P), and Ca-P product (CPP) are associated with cardiovascular disease in patients with chronic kidney disease. Whether this relationship persists in individuals with normal kidney function is not yet elucidated. We explored the relationship of serum Ca, P, and CPP to coronary atherosclerosis assessed by cardiac computed(More)
Sargassum hemiphyllum (SH) has long been used in Korean folk medicine for the therapeutic treatment of various allergic diseases. The effects of SH in previous experimental models, however, have been inconclusive. We studied the effects of methanol extract of SH on mast cells. Our experiments showed that SH significantly inhibited compound 48/80-induced(More)
AIMS Right ventricular (RV) failure is known to be the main cause of mortality and is closely related to prognosis in patients with pulmonary arterial hypertension (PAH). A decrease in the duration of tricuspid regurgitation corrected for heart rate (TRDc) has recently been shown to be associated with advanced RV failure and poor clinical outcomes. The aim(More)
In this paper, we describe implementation and test result for a LonWorks based control system in which air conditioner is handled by LonWorks node. The LonWorks based control system for handling air conditioner remotely is integration of control nodes because LonWorks is a communication protocol which is adopted as a standard protocol in building automation(More)
This paper presents a real-time motion control system using EtherCAT protocol and its application on a differential drive mobile robot. The motion controller is designed from open-source components consisting of dual kernel approach using standard Linux and real-time extension of Xenomai, and the EtherCAT Master stack, IgH. In order to validate feasibility(More)
PURPOSE To evaluate the ability of coronary computed tomographic angiography (CCTA) to predict the need of coronary revascularization in symptomatic patients with stable angina who were referred to a cardiac catheterization laboratory for coronary revascularization. MATERIALS AND METHODS Pre-angiography CCTA findings were analyzed in 1846 consecutive(More)
This paper presents a development of automatic complementary metal-oxide-semiconductor (CMOS) camera inspection system to examine defects. The image capture board based on embedded linux using system-on-a-chip (SoC) and a complex programmable logic device (CPLD) is developed to capture CMOS sensor data. The captured sensor data is transferred to the host(More)
PURPOSE To investigate the feasibility of blood pressure difference measurement, ΔP, across the coronary artery using phase contrast (PC)-MRI for potential noninvasive assessment of the functional significance of coronary artery stenosis. METHODS Three-directional velocities in the coronary arteries acquired using 2D-PC-MRI were used with the(More)
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