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프로세서 노드 상황을 고려하는 저비용 파이프라인 브로드캐스트 하드웨어 엔진
Park, Jongsu 한국정보통신학회 2020 한국해양정보통신학회논문지 Vol.24 No.8
This paper presents a low cost hardware message passing engine of enhanced atomic pipelined broadcast based on processing node status. In this algorithm, the previous atomic pipelined broadcast algorithm is modified to reduce the waiting time until next broadcast communication. For this, the processor change the transmission order of processing nodes based on the nodes' communication channel. Also, the hardware message passing engine architecture of the proposed algorithm is modified to be adopted to multi-core processor. The synthesized logic area of the proposed hardware message passing engine was reduced by about 16%, compared by the pre-existing hardware message passing engine.
프로세서 노드 상황을 고려하는 효율적인 메시지 스캐터 및 개더 알고리즘
Park, Jongsu 한국정보통신학회 2022 한국해양정보통신학회논문지 Vol.26 No.4
To maximize performance in a high-performance multicore processor system. it is essential to enable effective data communication between processing cores. Data communication between processor nodes can be broadly classified into collective and point-to-point communications. Collective communication comprises scattering and gathering. This paper presents a efficient message scattering and gathering based on processing node status. In the proposed algorithms, the transmission order is changed according to the data size of the pre-existing communication, to reduce the waiting time required until the collective communications begin. From the simulation, the performances of the proposed message scattering and gathering algorithms were improved by approximately 71.41% and 69.84%.
프로세서 노드 상황을 고려하는 저비용 파이프라인 브로드캐스트 하드웨어 엔진
Park, Jongsu 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.8
This paper presents a low cost hardware message passing engine of enhanced atomic pipelined broadcast based on processing node status. In this algorithm, the previous atomic pipelined broadcast algorithm is modified to reduce the waiting time until next broadcast communication. For this, the processor change the transmission order of processing nodes based on the nodes' communication channel. Also, the hardware message passing engine architecture of the proposed algorithm is modified to be adopted to multi-core processor. The synthesized logic area of the proposed hardware message passing engine was reduced by about 16%, compared by the pre-existing hardware message passing engine.
Hybrid Dynamic Branch Prediction to Reduce Destructive Aliasing
Park, Jongsu The Korea Institute of Information and Commucation 2019 한국정보통신학회논문지 Vol.23 No.12
This paper presents a prediction structure with a Hybrid Dynamic Branch Prediction (HDBP) scheme which decreases the number of stalls. In the application, a branch history register is dynamically adjusted to produce more unique index values of pattern history table (PHT). The number of stalls is also reduced by using the modified gshare predictor with a long history register folding scheme. The aliasing rate decreased to 44.1% and the miss prediction rate decreased to 19.06% on average compared with the gshare branch predictor, one of the most popular two-level branch predictors. Moreover, Compared with the gshare, an average improvement of 1.28% instructions per cycle (IPC) was achieved. Thus, with regard to the accuracy of branch prediction, the HDBP is remarkably useful in boosting the overall performance of the superscalar processor.
Processing-Node Status-based Message Scattering and Gathering for Multi-processor Systems on Chip
Park, Jongsu The Korea Institute of Information and Commucation 2019 Journal of information and communication convergen Vol.17 No.4
This paper presents processing-node status-based message scattering and gathering algorithms for multi-processor systems on chip to reduce the communication time between processors. In the message-scattering part of the message-passing interface (MPI) scatter function, data transmissions are ordered according to the proposed linear algorithm, based on the processor status. The MPI hardware unit in the root processing node checks whether each processing node's status is 'free' or 'busy' when an MPI scatter message is received. Then, it first transfers the data to a 'free' processing node, thereby reducing the scattering completion time. In the message-gathering part of the MPI gather function, the data transmissions are ordered according to the proposed linear algorithm, and the gathering is performed. The root node receives data from the processing node that wants to transfer first, and reduces the completion time during the gathering. The experimental results show that the performance of the proposed algorithm increases at a greater rate as the number of processing nodes increases.
Provisioning of Subscriber-Level QoS Guarantees on Ethernet
Jongsu Park,Tae-Hyun Kwon,Won-Young Chung,Dae-Geun Park,Yong-Surk Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
A novel subscriber-based quality-of-service provisioning scheme on Ethernet LANs is proposed. Our proposal can measure the bandwidths being used by subscribers by classifying Ethernet frames for the subscribers in real-time. Therefore, this scheme easily provides not only equal bandwidths for all subscribers, but also different bandwidths for each of the subscribers on Ethernet LANs.
Analysis of Adhesion Strength of Laminated Copper Layers in Roll-to-Roll Lamination Process
Lee, Jongsu,Park, Sungsik,Park, Janghoon,Cho, Young Seek,Shin, Kee-Hyun,Lee, Dongjin Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.9
The roll-to-roll (R2R) lamination process is a promising technology for the fabrication of flexible electronic devices on large areas such as solar cells or organic light emitting diodes. In this study, mechanical factors in the R2R lamination process that affect the adhesion strength of laminated composite were studied by finite-element simulation based on a theoretical model. Moreover, the effect of mechanical factors on the attenuation of adhesion strength was evaluated by using a full factorial design of experiment. The results show that the adhesive strength of the laminated composite decreases as the operating tension and strain rate increase. However, the radius of the roller has the opposite tendency to the operating tension. Non-linear regression model was developed to express the adhesion strength according to the mechanical factors, followed by the determination of their ranges to minimize peel-off. The suggested analysis method, devices and non-linear regression model could be used as a guideline to pre-determine the operating conditions in the R2R lamination process before manufacturing laminated composites.