Jeong-Soo Park

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Ray tracing naturally supports high-quality global illumination effects, but it is computationally costly. Traversal and intersection operations dominate the computation of ray tracing. To accelerate these two operations, we propose a hardware architecture integrating three novel approaches. First, we present an ordered depth-first layout and a traversal(More)
We present a hybrid architecture, inspired by asynchronous BVH construction [1], for ray tracing animated scenes. Our hybrid architecture utilizes heterogeneous hardware resources: dedicated ray-tracing hardware for BVH updates and ray traversal and a CPU for BVH reconstruction. We also present a traversal scheme using a primitive's axis-aligned bounding(More)
To predict antimicrobial activities i.e., minimal inhibitory concentration (MIC) and minimal biocidal concentration (MBC) for ionic liquids (ILs) against Escherichia coli, Staphylococcus aureus and Candida albicans, six quantitative structure-activity relationship (QSAR) models were developed using linear free energy relationship (LFER) descriptors(More)
PURPOSE Meta-analysis of this study was to analyze the character of adolescent smoking cessation programs, to calculate the effect size according to variables and to compare the weighted mean effect sizes on adolescent smoking cessation programs in Korea. METHODS Twenty two studies for meta-analysis were selected from dissertations, theses, articles and(More)
We present an ordered depth-first tree layout for ray tracing. Among two child nodes, a child node with the larger surface area is stored next to its parent node. Hence, the probabilities that a ray accesses to the same cache line increase. Our approach can be easily and widely used for various ray tracing systems with very small overheads, as it is based(More)
Many data sets obtained from surveys or medical trials often include missing observations. Since ignoring the missing information usually cause bias and inefficiency, an algorithm for estimating parameters is proposed based on the likelihood function of which the missing information is taken account. A binomial response and normal exploratory model for the(More)
OBJECTIVE To calculate the numbers of weekly infections and prevalence of malaria, and to predict future trend of malaria incidences in South Korea. METHODS Weekly incidences of malaria for 13 years from the period 2001-2013 in South Korea were analyzed. The back-calculation equations were used with incubation period distributions. The maximum likelihood(More)