• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1581-1582
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• 2007

본 컨트롤러는 기존 고속인쇄기 인쇄 속도인 250 [mpm]의 두 배 속도인 500 [mpm]의 고속 인쇄에서도 사용할 수 있는 고성능 레지스터 컨트롤러를 개발해 오차 보정을 좀 더 정확하고 신속하게 하는 것에 그 목적이 있다. 즉, 고속 인쇄기에서 인쇄물의 인쇄오차 보상을 위한 고속 인쇄기용 레지스터 컨트롤러의 특성을 분석하고, 고성능 DSP를 이용하여 기존의 하드웨어에 의존하던 기능의 상당 부분을 소프트웨어로 처리함으로써 간단한 하드웨어 구조와 고성능 오차 보상 기능을 갖는 레지스터 컨트롤러를 개발하였다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2003.05a
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• pp.8-11
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• 2003

본 연구는 AC서보 모터의 벡터 제어를 구현하는데 있어 디지털 제어에 의한 시간 지연 및 Af) 변환기, QEP(Quadrature Encoder Pulse Circuit)등 주변 소자의 시간 지연에 의한 노이즈를 최소화하지 위하여 고성능 저 전압형 DSP인 TMX320F2812를 사용하였다. TMX320F2812는 150MIPS의 빠른 연산 속도와 12비트의 AD 컨버터, QEP회로는 물론 공간 전압 벡터 PWM을 발생시킬 수 있는 기능을 가진 모터 제어용 원친 DSP이다. 이와 같이 주변 회로들을 내장한 고성능 DSP의 사용은 모터 제어부의 하드웨어적인 구성을 간소화 시키고 이로 인한 비용 절감을 얻을 수 있다. 또한 전류 샘플을 위한 필터 부분을 디지털 필터화 하여 전류 샘플링 노이즈를 제거하였고, 옵셋 전압을 이용한 SVPWM을 구현하여 연산 시간을 대폭 단축 하였다. TMX320F2812의 단점인 고정 소수점 연산에 대해서는 각 변수에 대한 스케일링을 통해 유효 자리를 확보하였다.

• Annual Conference of KIPS
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• 2023.05a
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• pp.386-388
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• 2023

본 논문은 고성능 스토리지를 사용하는 환경에서 대규모 그래프를 분석을 위한 GPU 기반 그래프 분석 엔진의 I/O 최적화 전략을 제안한다. 사전 실험을 통해 최신 GPU 기반 그래프 엔진인 RealGraph^GPU 가 고성능 스토리지의 대역폭을 충분히 활용하지 못하고 있음을 발견하였다. 이를 개선하기 위해 (1) User-space I/O, (2) Asynchronous I/O 두 가지 최적화 전략을 적용하였으며, 실험을 통해 두 전략이 RealGraphGPU 의 그래프 분석 성능 향상시키는 데 효과적임을 확인하였다.

• Annual Conference of KIPS
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• 2023.11a
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• pp.50-52
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• 2023

ML/DL과 같은 AI의 연구가 HPC 환경에서 수행되면서 데이터 병렬화, 분산 학습 및 대규모 데이터 세트를 처리를 위한 요구사항이 급격히 증가하였다. 또한, 병렬처리 연산에 특화된 가속기 기반 이기종 아키텍처 환경 변화로 I/O 처리에 고대역폭, 저지연의 스토리지 기술을 필요로 하고 있다. 본 논문에서는 고집적의 병렬 컴퓨팅 환경에 고성능 HPC, AI 애플리케이션을 처리하기 위한 티어링 스토리지 기술을 논한다. 나아가 실제 고성능 NVMe 기반의 플래시 티어링 계층 구성에서 액세스 패턴에 따른 데이터 처리 환경을 구축하고 성능을 검증한다. 이로써 다양한 사용자 어플리케이션의 I/O 패턴을 특성에 맞게 지원할 수 있다.

• Annual Conference of KIPS
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• 2024.05a
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• pp.534-537
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• 2024

Single-machine-based 그래프 엔진은 단일 머신을 이용해 고성능의 그래프 분석을 가능하게 하지만 distributed-system-based 그래프 엔진보다 확장성이 낮다. 본 논문은 single-machine-based 그래프 엔진 중 state-of-the-art 인 RealGraph 에 NVMe-oF 기술을 이용한 고성능 원격 스토리지를 연결해 성능을 확인했다. 실험으로 우리는 고성능 원격 스토리지를 이용한 single-machine-based 그래프 엔진의 확장가능성이 있음을 확인하고 향후 연구에서 고성능 원격 스토리지를 사용할 경우 구조개선이 필요함을 제시한다.

• The Korean Journal of Malacology
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• v.28 no.3
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• pp.233-244
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• 2012

Goseong bay, located in southeast sea of Korea with an area of 2,100 ha, is a semi-enclosed bay well-known for oyster farming cultured in an extended range of 148 ha. The objective of this study is to provide the fundamental data in order to manage the effective sea area. A total 26 of surface sediment were collected from Goseong bay to evaluate their sedimentary environment and heavy metals. The loss on Ignition (LOI), C/N ratio, acid volatile sulfide (AVS) and heavy metals were analyzed. loss on ignition (LOI) of surface sediment range from 1.00% to 3.03% (average 2.00%). The carbonate content ranges from 0.52% to 4.29% (average 2.37%). C/N ratio of organic matter showed that most part of organic matter comes from neighboring continent. Acid volatile sulfide (AVS) value of surface sediment from 0.02 mg/g to 1.43 mg/g (average 0.24 mg/g). A ten element of surface sediments (Al, As, Cd, Cr, Cu, Hg, Ni, Pb, V, Zn) were calculated by enrichment factor (Ef) and the results show that some areas are highly polluted with respect Cu and Hg. The correlation matrix displays the existence of remarkable levels of correlation with both positive and negative values among different variable pairs. LOI and AVS showed both positive values. LOI and AVS values falls under 2% and 1%. Therefore, Goseong bay showed good in quality of sediment.

• Management & Information Systems Review
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• v.38 no.2
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• pp.139-163
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• 2019

The purpose of this study is to identify the influence of the high performance and the work system recognized by the organizational members participating in the NCS enterprise utilization consulting on the organizational effectiveness and the influence of the organizational performance. In order to achieve the purpose of this study, the research hypotheses were verified by applying multiple regression analysis and co-integration regression analysis on the 145 usable results from using the statistical program of SPSS 24.0. The results of this study are as follows. First, hypothesis 1, the analysis of positive(+) influence on organizational effectiveness on the characteristics of the system (selection system, evaluation and compensation, education and training opportunity, member participation system, job stability) was adopted due to its' positive(+) and significant relationship. Second, hypothesis 2, an analysis that the organizational effectiveness would have a positive impact on organizational performance was adopted due to its' proven work. However, its' effectiveness will need verification. Third, regression analysis was conducted to confirm the role of the hypothesis 3, personnel management effectiveness, between the high performance and the work system (selection system, evaluation/compensation, education/training opportunity, member participation system, job stability). As a result, Hypothesis 3 showed that the selection system (H3-1), evaluation and compensation(H3-2), education and career opportunities(H3-3), member participation system(H3-4), job stability(H3-4) showed that organizational effectiveness has a moderating role in HR effectiveness. The main implication of this study is that the positive and working system recognized by the organizational members has positive affects on organizational effectiveness and organizational performance. In order to enhance the substantiality management system through improvement of organizational performance, a regular implementation plan on a high-performance working system along with education & training system to improve organizational effectiveness is required so that the members of the organization could form a consensus. Second, as a result of confirming the moderating effects of HR management effectiveness, the moderating role of HR management system and organization effectiveness was verified positive. Therefore, this study shows that the part that verifies both organizational effectiveness and organizational performance through high-performance working system and the part that confirmed the role of control between high-performance work system and organizational effectiveness are the biggest difference from the previous research.

• Cement
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• s.152
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• pp.55-57
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• 2000

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.610-616
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• 2020

Recently, the application of a photocatalyst to road structures is being attempted to solve environmental problems caused by fine particulate matter and automobile exhaust. The purpose of this study was to develop a release agent with GST (low-cost, high-performance photocatalyst produced from wastewater sludge). For this, the method of mixing and dispersing GST with the release agent was used first, and the removal performance of nitrogen oxide (NOx) was then checked. The best performance without a precipitation reaction was achieved using a stabilizing agent at 20 % in an outdoor exposure test for four weeks. The NO and NOx removal rate of the specimen demolded by applying the GST release agent developed in this study showed excellent effects of 200 to 400 % compared to the Plain material. To increase the performance of the GST release agent, it is necessary to improve the dispersibility of GST in the release agent and increase the amount of the nano-sized photocatalyst. In addition, the use of GST release agent in road structures and exposed concrete is expected to increase the NOx removal efficiency.

• The Journal of the Korea Contents Association
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• v.8 no.5
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• pp.72-81
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• 2008

High Performance DSP usually supports cache and internal memory. For an optimal implementation of a multimedia stream application on such a high performance DSP, one needs to utilize the cache and internal memory efficiently. In this paper, we investigate performance analysis of cache, and internal memory configuration and placement necessary to achieve an optimal implementation of multimedia stream applications like motion picture encoder on high performance DSP, TMS320C6000 series, and propose strategies to improve performance for cache and internal memory placement. From the results of analysis and experiments, it is verified that 2-way L2 cache configuration with the remaining memory configured as internal memory shows relatively good performance. Also, it is shown that L1P cache hit rate is enhanced when frequently called routines and routines having caller-callee relationships with them are continuously placed in the internal memory and that L1D cache hit rate is enhanced by the simple change of the data size. The results in the paper are expected to contribute to the optimal implementation of multimedia stream applications on high performance DSPs.