Chung-Yi Chang

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A construction of 64-QAM Golay complementary sequences was proposed by Lee and Golomb, where three QPSK Golay-Davis-Jedwab complementary sequences (GDJ sequences, or standard Golay sequences) related by a pair of offsets were combined to form each 64-QAM Golay sequence. Feasible offset pairs were given as first order generalized Boolean functions in(More)
Recent studies have shown that computerized clinical case management and decision support systems can be used to assist surgeons in the diagnosis of disease, optimize surgical operation, aid in drug therapy and decrease the cost of medical treatment. Therefore, medical informatics has become an extensive field of research and many of these approaches have(More)
We compared live/real time three-dimensional transesophageal echocardiography (3D TEE) with real time two-dimensional transesophageal echocardiography (2D TEE) in the assessment of individual mitral valve (MV) segment/scallop prolapse and associated chordae rupture in 18 adult patients with a flail MV undergoing surgery for mitral regurgitation. 2D TEE was(More)
BACKGROUND Disturbances in intracellular pH (pHi) of the heart can trigger major changes in the strength and rhythm of the heartbeat. It is well known that two extruders, Na+/H+ exchange (NHE) and Na+/HCO3- symporter (NHS), and a monocarboxylic acid transporter (MCT) are involved in acid-equivalent extruding in the human heart. Drinking alcohol has been(More)
BACKGROUND Perioperative monitoring of mitral valve (MV) anatomy, function, and pathology is essential for surgical management of different MV disease. AIMS To overcome the several potential pitfalls of two-dimensional transesophageal echocardiography (2D TEE) and offline 3D TEE. METHODS Live 3D TEE was used to assess 73 patients (44 men and 29 women)(More)
OBJECTIVE To improve the surgical results of aortic dissection, we used a novel vascular ring connector for anastomosis. METHODS The vascular ring connector is a titanic ring used as a stent in the vascular graft to achieve a quick, blood-sealed, and sutureless anastomosis. From November 2007 to December 2008, 19 consecutive patients (age range 36-77(More)
In this report, we present 34 patients in whom surgical intervention was undertaken for severe mitral insufficiency due to mitral valve prolapse (MVP). Location and severity of MVP and regurgitation were assessed preoperatively by live/real time three-dimensional transthoracic echocardiography and closely agreed with the surgical findings.
Endovascular stent grafts have become increasingly used in the management of arterial trauma, chronic vascular occlusive diseases, and deep vein thrombosis (DVT). Here, we describe a case of stent migration to the right heart due to a motor vehicle accident in a patient with iliac venous stent implanted for venous stenosis. Computed tomography (CT) scan(More)
Many queries sent to search engines refer to specific locations in the world. Location-based queries try to find local services and facilities around the user’s environment or in a particular area. This paper reviews the specifications of geospatial queries and discusses the similarities and differences between location-based queries and other queries. We(More)
Aorto-left ventricular tunnel (ALVT) is a rare congenital malformation. We report an unusual case of ALVT with a large interventricular septal aneurysm causing severe aortic regurgitation and left ventricular outflow obstruction diagnosed with real time three-dimensional transesophageal echocardiography (3D TEE). Real time 3D TEE allows for assessment and(More)