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As flash memory technologies quickly improve, NAND flash memory-based storage devices are becoming a viable alternative as a secondary storage solution for general-purpose computing systems such as personal computers and enterprise server systems. Most existing flash translation layer (FTL) schemes are, however, ill-suited for such systems because they were(More)
For robust spoken conversational interaction, many dialog state tracking algorithms have been developed. Few studies, however, have reported the strengths and weaknesses of each method. The Dialog State Tracking Challenge (DSTC) is designed to address this issue by comparing various methods on the same domain. In this paper, we present a set of techniques(More)
The cost-per-bit of NAND flash memory has been continuously improved by semiconductor process scaling and multi-leveling technologies (e.g., a 10 nm-node TLC device). However, the decreasing lifetime of NAND flash memory as a side effect of recent advanced technologies is regarded as a main barrier for a wide adoption of NAND flash-based storage systems. In(More)
The multi-level cell (MLC) NAND flash memory technology enables multiple bits of information to be stored on a single cell, thus making it possible to increase the density of the memory without increasing the die size. For most MLC flash memories, each cell can be programmed as a single-level cell or a multi-level cell during runtime. Therefore, it has a(More)
Many dialog state tracking algorithms have been limited to generative modeling due to the influence of the Partially Observable Markov Decision Process framework. Recent analyses, however, raised fundamental questions on the effectiveness of the generative formulation. In this paper, we present a structured discriminative model for dialog state tracking as(More)
In this paper we describe BlueSSD, an open platform for exploring hardware and software for NAND flash-based SSD architectures. We introduce the overall architecture of BlueSSD from a hardware and software perspective and briefly explain our design methodology. Preliminary evaluation shows that BlueSSD delivers performance comparable to commercially(More)
During the recent Dialog State Tracking Challenge (DSTC), a fundamental question was raised: “Would better performance in dialog state tracking translate to better performance of the optimized policy by reinforcement learning?” Also, during the challenge system evaluation, another nontrivial question arose: “Which evaluation metric and schedule would best(More)
Recently Network Mobility(NEMO) is being concerned as new mobility issue. Lots of NEMO issues are already being touched in IETF NEMO WG but the solution is still premature especially to the Route Optimization (RO). NEMO has several problem spaces that need RO such as nested tunnels problem. Unfortunately, there is no solution that can be universally applied(More)
Complex data queries, because of their need for random accesses, have proven to be slow unless all the data can be accommodated in DRAM. There are many domains, such as genomics, geological data and daily twitter feeds where the datasets of interest are 5TB to 20 TB. For such a dataset, one would need a cluster with 100 servers, each with 128GB to 256GBs of(More)