Chanyoung Park

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This paper investigates the effects of the number of coupon and element tests on uncertainty in element failure stress. In aircraft structural design, failure stress is first obtained from coupon tests, which is then used in predicting failure stress of structural element under combined loads. The mean and standard deviation of failure stress are expressed(More)
To evaluate the effects of botulinum toxin type A (BTX-A) on mandible skeletal development by inducing muscle hypofunction. Four-week-old Sprague-Dawley rats (n=60) were divided into three groups: Group 1 animals served as controls and were injected with saline; Group 2 animals were injected unilaterally with BTX-A (the contralateral side was injected with(More)
Spin-Transfer Torque Magnetoresistive RAM (STT-MRAM) is being intensively explored as a promising on-chip last-level cache (LLC) replacement for SRAM, thanks to its low leakage power and high storage capacity. However, the write penalties imposed by STT-MRAM challenges its incarnation as a successful LLC by deteriorating its performance and energy(More)
We compared the effects of an ethylene absorbent and the ethylene inhibitor 1-methylcyclopropene (1-MCP) on tomato (Solanum lycopersicum Mill. cv. Dotaerang) during storage. Tomato fruits at the ‘breaker’ stage were harvested and treated with an ethylene absorbent, 1 μL·L-1 1-MCP or 2 μL·L-1 1-MCP and stored at 20°C for 15 days. We then measured weight(More)
Sparseness of user-to-item rating data is one of the major factors that deteriorate the quality of recommender system. To handle the sparsity problem, several recommendation techniques have been proposed that additionally consider auxiliary information to improve rating prediction accuracy. In particular, when rating data is sparse, document modeling-based(More)
The goal of RecSys Challenge 2015 [2] is: (1) to predict which user will end up with a purchase and if so, (2) to predict items that he/she will buy given click/purchase data provided by YOOCHOOSE. It is hard to achieve the goal of this Challenge because (1) the data does not contain user demographics information and it contains a lot of missing values and(More)
In this article, we describe GCS, an acronym for Grammatical Coding System; GCS is designed as a general-use grammatical coding system appropriate for research on the language of normal and language-impaired children or adults. GCS is intended for use in any study concerned with grammatical development and is especially useful for studies in which a(More)
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