Seung-Hyun Yoon

Learn More
OBJECTIVE The purpose of this study was to show the usefulness of dynamic contrast-enhanced MRI (DCE-MRI) and to determine the optimal time window in MRI for differentiating between septic arthritis and transient synovitis in painful hip joints. MATERIALS AND METHODS Eighteen patients who underwent DCE-MRI were enrolled, and the final diagnoses were(More)
We present a sweep-based approach to human body modeling and deformation. A rigid 3D human model, given as a polygonal mesh, is approximated with control sweep surfaces. The vertices on the mesh are bound to nearby sweep surfaces and then follow the deformation of the sweep surfaces as the model bends and twists its arms, legs, spine and neck. Anatomical(More)
We present a real-time algorithm for computing the precise Hausdorff Distance (HD) between two planar freeform curves. The algorithm is based on an effective technique that approximates each curve with a sequence of G 1 biarcs within an arbitrary error bound. The distance map for the union of arcs is then given as the lower envelope of trimmed truncated(More)
We propose a sweep-based approach to the freeform deformation of three-dimensional objects. Instead of using a volume enclosing the whole object, we approximate only its deformable parts using sweep surfaces. The vertices on the object boundary are bound to the sweep surfaces and follow their deformation. Several sweep surfaces can be organized into a(More)
OBJECTIVES To investigate (1) the relation between needle diameter and treatment efficacy of myofascial pain syndrome and (2) the relation between needle diameter and pain intensity during injection. DESIGN Randomized controlled trial. SETTING University-affiliated tertiary-care hospital. PARTICIPANTS Volunteers (N=77) with myofascial pain syndrome(More)
Android is one of the most widely spread mobile platform. Many people are using Android mobile devices and many developers are creating Android applications at this moment. When developing applications, the differences in performance between Java and C/C++ are a well-known issue. Because this is also true in Android, many Android application developers(More)
BACKGROUND The proximal tibiofibular joint (PTFJ) can be considered the fourth compartment of the knee joint. However, there have been no studies of the T2 values (T2 relaxation time) of PTFJ cartilage. PURPOSE To assess the T2 values of PTFJ cartilage at 3T magnetic resonance imaging (MRI), and to show the clinical utility of T2 values of PTFJ cartilage(More)
OBJECTIVE To determine whether subacromial injection with high-dose corticosteroid in patients with periarticular shoulder disorders is better than low-dose corticosteroid or placebo in improving pain, function, and active range of motion (AROM). DESIGN Multicenter, randomized, triple-blind, placebo-controlled trial. SETTING Primary (n=2) and(More)
The aim of this study was to evaluate the correlations between T2 value, T2* value, and histological grades of degenerated human articular cartilage. T2 mapping and T2* mapping of nine tibial osteochondral specimens were obtained using a 3-T MRI after total knee arthroplasty. A total of 94 ROIs were analyzed. Histological grades were assessed using the(More)
We present a new approach to the modeling and deformation of a human or virtual character’s arms and legs. Each limb is represented as a set of ellipsoids of varying size interpolated along a skeleton curve. A base surface is generated by approximating these ellipsoids with a swept ellipse, and the difference between that and the detailed shape of the arm(More)