Jae-Woo Choi

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Fast storage devices are an emerging solution to satisfy data-intensive applications. They provide high transaction rates for DBMS, low response times for Web servers, instant on-demand paging for applications with large memory footprints, and many similar advantages for performance-hungry applications. In spite of the benefits promised by fast hardware,(More)
BACKGROUND The prevalence and economic burden of chronic diseases are increasing worldwide. Nevertheless, little information is available on catastrophic health expenditures (CHE) associated with chronic diseases in Korea. This study explored the burden of household out-of-pocket health expenditures among the Korean population for different chronic(More)
Emerging non-volatile memory technologies as a disk drive replacement raise some issues of software stack and interfaces, which have not been considered in disk-based storage systems. In this work, we present new cooperative schemes including software and hardware to address performance issues with deploying storage-class memory technologies as a storage(More)
All Rights Reserved iii To my wife, Lun iv v Acknowledgements First, I would like to express my sincere gratitude to my advisor, Professor Demetri Psaltis, for his support and guidance throughout my graduate studies at Caltech. I'll be forever indebted to him for offering me the opportunity to pursue my PhD degree at the same school as my wife, not to(More)
Recently, the demand for fast storages is rapidly increasing in HPC environments such as cloud platforms, social network services and desktop users. But HDD-based storages cannot satisfy these demands, and a variety of high performance storages providing lower I/O latency and higher I/O bandwidth have been eagerly developed. Although merely adopting these(More)
The application of electrical fields within a microfluidic channel enables many forms of manipulation necessary for lab-on-a-chip devices. Patterning electrodes inside the microfluidic channel generally requires multi-step optical lithography. Here, we utilize an ion-implantation process to pattern 3D electrodes within a fluidic channel made of(More)
Free-standing lithium niobate nanowires ͑LiNbO 3 ͒ are synthesized by the hydrothermal route. The polarization response of the second harmonic generation ͑SHG͒ signal is measured in a single nanowire and used to identify the crystal orientation by matching with bulk LiNbO 3 nonlinear optical susceptibility. The electrical manipulation of a LiNbO 3 nanowire(More)
Storage area network (SAN) is one of the most popular solutions for constructing server environments these days. In these kinds of server environments, HDD-based storage usually becomes the bottleneck of the overall system, but it is not enough to merely replace the devices with faster ones in order to exploit their high performance. In other words, proper(More)
OBJECTIVES We examined correlations between number and gender of offspring and health-related quality of life (HRQoL) and quality of life (QoL) in older adults. SETTING We used data from the 2006-2012 data sets of the Korean Longitudinal Study of Aging. PARTICIPANTS There were 10,242, 8680, 7907 and 7480 participants in 2006, 2008, 2010 and 2012,(More)