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OpenCL을 활용한 CPU와 GPU 에서의 CMMB LDPC 복호기 병렬화
박주열,홍정현,정기석,Park, Joo-Yul,Hong, Jung-Hyun,Chung, Ki-Seok 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.6
Recently, Open Computing Language (OpenCL) has been proposed to provide a framework that supports heterogeneous computing platforms. By using an OpenCL framework, digital communication systems can support various protocols in a unified computing environment to achieve both high portability and high performance. This article introduces a parallel software decoder of Low Density Parity Check (LDPC) codes for China Multimedia Mobile Broadcasting (CMMB) on a heterogeneous platform. Each step of LDPC decoding has different parallelization characteristics. In this paper, steps suitable for task-level parallelization are executed on the CPU, and steps suitable for data-level parallelization are processed by the GPU. To improve the performance of the proposed OpenCL kernels for LDPC decoding operations, explicit thread scheduling, loop-unrolling, and effective data transfer techniques are applied. The proposed LDPC decoder achieves high performance by using heterogeneous multi-core processors on a unified computing framework.
박주열 한국아동교육학회 1993 아동교육 Vol.3 No.1
This study is aimed at examining the effects of career exploration group counseling for middle school students on the ego-identy. The subjects were twenty-four middle school students who volunteered to participate in this group counseling. They were randomly assigned to the experimental(N=12) and control(N=12) groups. The career exploration group counseling was given one ession a week for twelve weeks. Each session lasted for 90 minutes. However, subjects in control group did not receive any treatment. The instrument used in this study was Ego-Identity Scale (by Park, A-Chung, 1984) included 48 statements and composed of eight subscales : stability, goal-directedness, uniqueness, interpersonal role expectation, self-acceptance, self-assertiveness, sense of self and interpersonal relation. And the pretest-posttest control group design used as a study plan of this study. The data were analyzed by t-test to find out the significant difference between the marks of experimental group and control group, Conclusions from the results and discussions of this study are as follows 1. Career exploration group counseling for middle school students is effective for increasing ego-identity. 2. Career exploration group counseling for middle school students is effective particularly on Self-Acceptance.
SNR 예측 정보 기반 적응형 Modified UMP-BP LDPC 복호기 설계
박주열,조걸,정기석,Park, Joo-Yul,Cho, Keol,Chung, Ki-Seok 대한임베디드공학회 2009 대한임베디드공학회논문지 Vol.4 No.4
As 4G mobile communication systems require high transmission rates with reliability, the need for efficient error correcting code is increasing. In this paper, a novel LDPC (Low Density Parity Check) decoder is introduced. The LDPC code is one of the most popular error correcting codes. In order to improve performance of the LDPC decoder, we use SNR (Signal-to-Noise Ratio) estimation results to adjust coefficients of modified UMP-BP (Uniformly Most Probable Belief Propagation) algorithm which is one of widely-used LDPC decoding algorithms. An advantage of Modified UMP-BP is that it is amenable to implement in hardware. We generate the optimal values by simulation for various SNRs and coefficients, and the values are stored in a look-up table. The proposed decoder decides coefficients of the modified UMP-BP based on SNR information. The simulation results show that the BER (Bit Error Rate) performance of the proposed LDPC decoder is better than an LDPC decoder using a conventional modified UMP-BP.