2,603 research outputs found
Accelerating Large-Scale Graph-based Nearest Neighbor Search on a Computational Storage Platform
K-nearest neighbor search is one of the fundamental tasks in various
applications and the hierarchical navigable small world (HNSW) has recently
drawn attention in large-scale cloud services, as it easily scales up the
database while offering fast search. On the other hand, a computational storage
device (CSD) that combines programmable logic and storage modules on a single
board becomes popular to address the data bandwidth bottleneck of modern
computing systems. In this paper, we propose a computational storage platform
that can accelerate a large-scale graph-based nearest neighbor search algorithm
based on SmartSSD CSD. To this end, we modify the algorithm more amenable on
the hardware and implement two types of accelerators using HLS- and RTL-based
methodology with various optimization methods. In addition, we scale up the
proposed platform to have 4 SmartSSDs and apply graph parallelism to boost the
system performance further. As a result, the proposed computational storage
platform achieves 75.59 query per second throughput for the SIFT1B dataset at
258.66W power dissipation, which is 12.83x and 17.91x faster and 10.43x and
24.33x more energy efficient than the conventional CPU-based and GPU-based
server platform, respectively. With multi-terabyte storage and custom
acceleration capability, we believe that the proposed computational storage
platform is a promising solution for cost-sensitive cloud datacenters.Comment: Extension of FCCM 20201 and Accepted in Transaction on Computer
MOF-Derived Cu@Cu2O Nanocatalyst for Oxygen Reduction Reaction and Cycloaddition Reaction
Research on the synthesis of nanomaterials using metal-organic frameworks (MOFs), which are characterized by multi-functionality and porosity, as precursors have been accomplished through various synthetic approaches. In this study, copper and copper oxide nanoparticles were fabricated within 30 min by a simple and rapid method involving the reduction of a copper(II)-containing MOF with sodium borohydride solution at room temperature. The obtained nanoparticles consist of a copper core and a copper oxide shell exhibited catalytic activity in the oxygen reduction reaction. The as-synthesized Cu@Cu2O core-shell nanocatalyst exhibited an enhanced limit current density as well as onset potential in the electrocatalytic oxygen reduction reaction (ORR). Moreover, the nanoparticles exhibited good catalytic activity in the Huisgen cycloaddition of various substituted azides and alkynes under mild reaction conditions
In situ-generated metal oxide catalyst during CO oxidation reaction transformed from redox-active metal-organic framework-supported palladium nanoparticles
The preparation of redox-active metal-organic framework (ra-MOF)-supported Pd nanoparticles (NPs) via the redox couple-driven method is reported, which can yield unprotected metallic NPs at room temperature within 10 min without the use of reducing agents. The Pd@ra-MOF has been exploited as a precursor of an active catalyst for CO oxidation. Under the CO oxidation reaction condition, Pd@ra-MOF is transformed into a PdOx-NiOy/C nanocomposite to generate catalytically active species in situ, and the resultant nanocatalyst shows sustainable activity through synergistic stabilization.open4
- …