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Approximate Computing Platform Maximizing Computating Efficiency of Near-Threshold Circuits

Research Project

Project/Area Number 20K19768
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 60040:Computer system-related
Research InstitutionOsaka University (2021-2023)
Kyoto University (2020)

Principal Investigator

Shiomi Jun  大阪大学, 大学院情報科学研究科, 准教授 (40809795)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords計算機システム / 省エネルギー / 低消費電力化 / ニアスレッショルドコンピューティング / 近似コンピューティング
Outline of Research at the Start

定格値の半分以下の電源電圧で集積回路を稼働させるニアスレッショルドコンピューティングと,多少の計算誤りを許容する近似コンピューティングを融合させた高効率コンピューティング基盤を明らかにする.小規模画像処理プロセッサなどを例とし,具体的には以下の3テーマに取り組む.
1. 極低電圧領域において顕著に生じる演算器の遅延ばらつき(遅延故障率)をモデル化し,与えられた遅延制約のもと,演算器が実現する演算精度をフィールドテスト(モニタ)する技術.
2. 要求される演算精度を満たしつつ,演算器を稼働させ続ける性能保証技術.
3. 実チップ測定を通した前述の2テーマの検証.

Outline of Final Research Achievements

This project developed a high-efficiency computing platform combining Near-Threshold Computing (NTC), where integrated circuits operate at less than half of the nominal supply voltage, and Approximate Computing (AC), which can tolerate small computational errors. However, NTC has a drawback that it can cause partial operation failures in the target circuit. This project developed NTC circuit design methods that absorb this drawback with AC. Specifically, this project was divided into brain-inspired computer design, low-voltage on-chip memory design, and dynamic voltage optimization methods. This project results in three publications in international journals, three presentations at international conferences, two presentations at domestic conferences, and three awards. The research concept of combining NTC and AC has been successfully demonstrated. Its impact is thus very significant.

Academic Significance and Societal Importance of the Research Achievements

あらゆるヒトやモノにIoT (Internet of Things)デバイスが組み込まれ、多種多様な情報を絶え間なく通信する次世代情報化社会が到来している。リアルタイム性、バッテリ駆動時間、CO2排出量の問題から、自動運転・ファクトリオートメーションなどの新サービスを支える集積回路の省エネルギー化・高性能化が喫緊の課題となっている。同時に、AC技術適用先の典型例である人工知能技術が急速に発展している。この社会トレンドをおさえ、NTCの欠点である動作技術をAC技術で克服し、NTC回路の利点である省エネルギー動作を享受できた意義は大きい。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Approximation-Based System Implementation for Real-Time Minimum Energy Point Tracking over a Wide Operating Performance Region2023

    • Author(s)
      SONODA Shoya、SHIOMI Jun、ONODERA Hidetoshi
    • Journal Title

      IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

      Volume: E106.A Issue: 3 Pages: 542-550

    • DOI

      10.1587/transfun.2022VLP0006

    • ISSN
      0916-8508, 1745-1337
    • Year and Date
      2023-03-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Robust and Energy Efficient Hyperdimensional Computing System for Voltage-scaled Circuits2023

    • Author(s)
      Liang Dehua、Awano Hiromitsu、Miura Noriyuki、Shiomi Jun
    • Journal Title

      ACM Transactions on Embedded Computing Systems

      Volume: - Issue: 6 Pages: 1-20

    • DOI

      10.1145/3620671

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Supply and Threshold Voltage Scaling for Minimum Energy Operation over a Wide Operating Performance Region2021

    • Author(s)
      SONODA Shoya、SHIOMI Jun、ONODERA Hidetoshi
    • Journal Title

      IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

      Volume: E104.A Issue: 11 Pages: 1566-1576

    • DOI

      10.1587/transfun.2020KEP0013

    • NAID

      130008109851

    • ISSN
      0916-8508, 1745-1337
    • Year and Date
      2021-11-01
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] DependableHD: A Hyperdimensional Learning Framework for Edge-Oriented Voltage-Scaled Circuits2023

    • Author(s)
      Dehua Liang, Hiromitsu Awano, Noriyuki Miura, Jun Shiomi
    • Organizer
      28th Asia and South Pacific Design Automation Conference (ASP-DAC)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] [記念講演]DependableHD: A Hyperdimensional Learning Framework for Edge-oriented Voltage-scaled Circuits2023

    • Author(s)
      Dehua Liang, Hiromitsu Awano, Noriyuki Miura, Jun Shiomi
    • Organizer
      信学技報
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Zero-Aware Fine-Grained Power Gating for Standard-Cell Memories in Voltage-Scaled Circuits2022

    • Author(s)
      Jun Shiomi, Shogo Terada, Tohru Ishihara, Hidetoshi Onodera
    • Organizer
      IEEE 35th International System-on-Chip Conference (SOCC)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Approximation-Based Implementation for a Minimum Energy Point Tracking Algorithm over a Wide Operating Performance Region2022

    • Author(s)
      Shoya Sonoda, Jun Shiomi, Hidetoshi Onodera
    • Organizer
      13th Latin American Symposium on Circuits and Systems (LASCAS)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 幅広い動作性能領域で最小エネルギー動作点を追跡するアルゴリズムの近似演算に基づく高効率実装2021

    • Author(s)
      園田翔也, 塩見準, 小野寺秀俊
    • Organizer
      DAシンポジウム2021
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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