Search

Your search keyword '"Yoon, Jongho"' showing total 18 results
Start Over Author "Yoon, Jongho" Search Limiters Available in Library Collection
18 results on '"Yoon, Jongho"'

1. Design and Evaluation Frameworks for Advanced RISC-based Ternary Processor

Author

Kam, Dongyun, Min, Jung Gyu, Yoon, Jongho, Kim, Sunmean, Kang, Seokhyeong, and Lee, Youngjoo

Subjects
Computer Science - Hardware Architecture, Computer Science - Emerging Technologies
Abstract

In this paper, we introduce the design and verification frameworks for developing a fully-functional emerging ternary processor. Based on the existing compiling environments for binary processors, for the given ternary instructions, the software-level framework provides an efficient way to convert the given programs to the ternary assembly codes. We also present a hardware-level framework to rapidly evaluate the performance of a ternary processor implemented in arbitrary design technology. As a case study, the fully-functional 9-trit advanced RISC-based ternary (ART-9) core is newly developed by using the proposed frameworks. Utilizing 24 custom ternary instructions, the 5-stage ART-9 prototype architecture is successfully verified by a number of test programs including dhrystone benchmark in a ternary domain, achieving the processing efficiency of 57.8 DMIPS/W and 3.06 x 10^6 DMIPS/W in the FPGA-level ternary-logic emulations and the emerging CNTFET ternary gates, respectively., Comment: Accepted to DATE 2022

Published
2021

5. Mobile Transformer Accelerator Exploiting Various Line Sparsity and Tile-Based Dynamic Quantization

Author

Kwon, Eunji, Yoon, Jongho, and Kang, Seokhyeong

Abstract

Transformer models are difficult to employ in mobile devices due to their memory- and computation-intensive properties. Accordingly, there is ongoing research on various methods for compressing transformer models, such as pruning and quantization. However, general computing platforms, such as central processing units (CPUs) and graphics processing units (GPUs), are not energy-efficient to accelerate the pruned model because the unstructured sparsity they exhibit causes degradation of parallelism. In this article, we propose a low-power accelerator for transformers that can handle various levels of structured sparsity induced by line pruning with different granularity. Our approach accelerates pruned transformers in a head-wise and line-wise manner. We present a head reorganization and shuffling method that supports head-wise skip operations and resolves the load imbalance problem among processing engines (PEs) caused by the varying number of operations in each head. Furthermore, we implemented a sparse quantized general matrix-to-matrix multiplication (SQ-GEMM) module that supports line-wise skipping and on-the-fly tile-based dynamic quantization of activations. As a result, compared to mobile GPU and CPU, the proposed accelerator improved the energy efficiency by $2.9\times $ and $12.3\times $ for the detection transformer (DETR), and $3.0\times $ and $12.4\times $ for the vision transformer (ViT) models, respectively. In addition, our proposed mobile accelerator achieved the highest-energy efficiency among the current state-of-the-art FPGA-based transformer accelerators.

Published
2024
Full Text
View/download PDF

15. Performance evaluation of flexible CIGS modules based on operational data under outdoor conditions.

Author

Lee, Ruda, Lee, Hyomun, Kim, Dongsu, and Yoon, Jongho

Subjects
GREEN New Deal (United States), DATABASES, CLOUDINESS, INCLINED planes, INDUSTRIALIZED building
Abstract

As a major driver to achieve feasible long‐term goals of the Korean Green New Deal policy, a renewable system application in a building, such as the building‐integrated photovoltaics (BIPV) system, has been expedited by raising a BIPV installation subsidy to 70%. Among the technology of BIPV modules, the CuInGaSe2 (CIGS) type module has been drawing attention and considered as one of the effective alternatives because of its benefits, including its flexibility, lightweights, and relative ease to use as a building material. However, the lack of information understanding of its real application to buildings has still existed under various outdoor experimental conditions. In response to this gap, this study analyzed the power generation performance of flexible CIGS modules under outdoor exposure conditions to evaluate their applicability to BIPV buildings. To conduct the test, the CIGS module was installed on an inclined plane (30°) and vertical plane (90°) using a mock‐up installed facing the south. In particular, this study assessed performance ratio (PR) values to analyze the power generation performance behaviors under direct/diffuse irradiance conditions along with diverse cloud cover conditions. Results from this experimental case study indicated that the power generation performance of the vertical CIGS module decreased compared with that of the inclined CIGS module during all analysis periods, except for the February period. This phenomenon became more distinct as the solar altitude angle increased, and the power generation performance of the vertical module became similar to that of the inclined module as the altitude angle decreased. By experimenting with the diffuse irradiance condition depending on the change in cloud cover, the PR decreased by approximately 12%. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results