• 제목/요약/키워드: versatile

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멀티모드 이동 통신 모뎀을 위한 전력 효율적 다기능 캐리스킵 가산기 (A Power Efficient Versatile Carry Skip Adder Architecture for the Multimode Mobile Modem)

  • 한태희
    • 대한전자공학회논문지SD
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    • 제45권3호
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    • pp.86-93
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    • 2008

  • 다양한 무선 통신 표준 규격을 수용하는 멀티모드 단말기 모뎀은 가변적인 워드 길이와 광범위한 데이터율을 처리한 수 있는 다기능 산술 연산 회로를 필요로 한다. 일반적으로 이런 목표를 위한 하드웨어는 요구되는 최고 성능을 달성하도록 설계되어지므로 종종 전력 소모 측면에서 낭비적인 요소가 있으며 특히 낮은 데이터율에서 심화되는 경향이 있다. 따라서 동작 속도와 전력에 적합한 산술 연산 치로는 무선 통신 응용 분야에서 매우 필수적인 요소이다. 본 논문에서는 계층적인 캐리스킵 로직을 기본 구성 블록으로 하는 전력 효율적 다기능 가산기 구조를 제안하고 다양한 동작 모드에서의 면적, 성능, 전력 효율을 보임으로써 효과를 입증하였다.

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CNN-based Fast Split Mode Decision Algorithm for Versatile Video Coding (VVC) Inter Prediction

  • Yeo, Woon-Ha;Kim, Byung-Gyu
    • Journal of Multimedia Information System
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    • 제8권3호
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    • pp.147-158
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    • 2021

  • Versatile Video Coding (VVC) is the latest video coding standard developed by Joint Video Exploration Team (JVET). In VVC, the quadtree plus multi-type tree (QT+MTT) structure of coding unit (CU) partition is adopted, and its computational complexity is considerably high due to the brute-force search for recursive rate-distortion (RD) optimization. In this paper, we aim to reduce the time complexity of inter-picture prediction mode since the inter prediction accounts for a large portion of the total encoding time. The problem can be defined as classifying the split mode of each CU. To classify the split mode effectively, a novel convolutional neural network (CNN) called multi-level tree (MLT-CNN) architecture is introduced. For boosting classification performance, we utilize additional information including inter-picture information while training the CNN. The overall algorithm including the MLT-CNN inference process is implemented on VVC Test Model (VTM) 11.0. The CUs of size 128×128 can be the inputs of the CNN. The sequences are encoded at the random access (RA) configuration with five QP values {22, 27, 32, 37, 42}. The experimental results show that the proposed algorithm can reduce the computational complexity by 11.53% on average, and 26.14% for the maximum with an average 1.01% of the increase in Bjøntegaard delta bit rate (BDBR). Especially, the proposed method shows higher performance on the sequences of the A and B classes, reducing 9.81%~26.14% of encoding time with 0.95%~3.28% of the BDBR increase.

  • https://doi.org/10.33851/JMIS.2021.8.3.147 인용 PDF KSCI HTML

Applicability of the induction bending process to the P91 pipe of the PGSFR

  • Kim, Nak Hyun;Kim, Jong Bum;Kim, Sung Kyun
    • Nuclear Engineering and Technology
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    • 제53권5호
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    • pp.1580-1586
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    • 2021

  • The application of induction bending processes to industrial pipe production is increasing. The induction bending process has the effect of reducing the number of inspections and preventing leaks by reducing the weld of the pipe. For these reasons, efforts have been made to apply an induction bending process to the pipe of the PGSFR under development in Korea and this is the first attempt in the SFR design. Since the PGSFR pipe has a relatively large diameter-to-thickness ratio, it is difficult to fabricate an induction bending pipe that meets the requirements. In addition, the material properties may change because the pipe heats to a very high temperature during the induction bending process. In this study, P91 pipes were fabricated by induction bending, and the results from analyzing the induction bending process' applicability to the P91 pipe of the PGSFR are examined. The various dimensional measurements of the pipes fabricated by the induction bending process were surveyed to determine whether the requirements of the ASME Code were met. The minimum thickness, ovality, and wall buckling measured in the fabricated pipe met all the requirements. Tensile, impact, and hardness tests at various locations of the fabricated pipe also satisfied the requirements.

  • https://doi.org/10.1016/j.net.2020.10.021 인용 PDF KSCI