• 제목/요약/키워드: Performance benchmark

검색결과 853건 처리시간 0.027초

Generation of Super-Resolution Benchmark Dataset for Compact Advanced Satellite 500 Imagery and Proof of Concept Results

  • Yonghyun Kim;Jisang Park;Daesub Yoon
    • 대한원격탐사학회지
    • /
    • 제39권4호
    • /
    • pp.459-466
    • /
    • 2023
  • In the last decade, artificial intelligence's dramatic advancement with the development of various deep learning techniques has significantly contributed to remote sensing fields and satellite image applications. Among many prominent areas, super-resolution research has seen substantial growth with the release of several benchmark datasets and the rise of generative adversarial network-based studies. However, most previously published remote sensing benchmark datasets represent spatial resolution within approximately 10 meters, imposing limitations when directly applying for super-resolution of small objects with cm unit spatial resolution. Furthermore, if the dataset lacks a global spatial distribution and is specialized in particular land covers, the consequent lack of feature diversity can directly impact the quantitative performance and prevent the formation of robust foundation models. To overcome these issues, this paper proposes a method to generate benchmark datasets by simulating the modulation transfer functions of the sensor. The proposed approach leverages the simulation method with a solid theoretical foundation, notably recognized in image fusion. Additionally, the generated benchmark dataset is applied to state-of-the-art super-resolution base models for quantitative and visual analysis and discusses the shortcomings of the existing datasets. Through these efforts, we anticipate that the proposed benchmark dataset will facilitate various super-resolution research shortly in Korea.

사용자 관점에서의 조인 연산 평가 방법론 (A Join Operations Benchmark in Users' Perspective)

  • 정회진;이상호
    • 정보처리학회논문지D
    • /
    • 제12D권1호
    • /
    • pp.13-20
    • /
    • 2005
  • 조인 연산은 데이터베이스 시스템의 가장 기본적이고 중요한 연산이며, 큰 수행 비용을 필요로 하는 연산이다. 지금까지 효율적인 조인 연산의 구현과 평가를 위한 다양한 연구가 진행되었다. 기존의 조인 연산 평가는 구현자 관점에서 우수한 알고리즘을 규명하기 위해 개발되었다. 본 논문은 사용자 관점에서 조인 연산 성능을 평가하는 조인 연산 평가 방법론을 기술한다. 본 성능 평가는 사용자가 자신의 업무에 적합한 조인 연산을 수행하는 데이터베이스 시스템을 선택하는데 도움을 준다. 본 논문에서는 두 가지 조인 범주와 여섯 가지의 조인 성능 영향 요소를 고려하여 42개의 평가 질의를 제안한다. 마지막으로 제안된 방법론에 따라 두 개의 상용 데이터베이스 시스템을 대상으로 구현하고 성능 평가 결과를 기술하였다.

A response matrix method for the refined Analytic Function Expansion Nodal (AFEN) method in the two-dimensional hexagonal geometry and its numerical performance

  • Noh, Jae Man
    • Nuclear Engineering and Technology
    • /
    • 제52권11호
    • /
    • pp.2422-2430
    • /
    • 2020
  • In order to improve calculational efficiency of the CAPP code in the analysis of the hexagonal reactor core, we have tried to implement a refined AFEN method with transverse gradient basis functions and interface flux moments in the hexagonal geometry. The numerical scheme for the refined AFEN method adopted here is the response matrix method that uses the interface partial currents as nodal unknowns instead of the interface fluxes used in the original AFEN method. Since the response matrix method is single-node based, it has good properties such as good calculational efficiency and parallel computing affinity. Because a refined AFEN method equivalent nonlinear FDM response matrix method tried first could not provide a numerically stable solution, a direct formulation of the refined AFEN response matrix were developed. To show the numerical performance of this response matrix method against the original AFEN method, the numerical error analyses were performed for several benchmark problems including the VVER-440 LWR benchmark problem and the MHTGR-350 HTGR benchmark problem. The results showed a more than three times speedup in computing time for the LWR and HTGR benchmark problems due to good convergence and excellent calculational efficiency of the refined AFEN response matrix method.

Modeling and simulation of VERA core physics benchmark using OpenMC code

  • Abdullah O. Albugami;Abdullah S. Alomari;Abdullah I. Almarshad
    • Nuclear Engineering and Technology
    • /
    • 제55권9호
    • /
    • pp.3388-3400
    • /
    • 2023
  • Detailed analysis of the neutron pathway through matter inside the nuclear reactor core is exceedingly needed for safety and economic considerations. Due to the constant development of high-performance computing technologies, neutronics analysis using computer codes became more effective and efficient to perform sophisticated neutronics calculations. In this work, a commercial pressurized water reactor (PWR) presented by Virtual Environment for Reactor Applications (VERA) Core Physics Benchmark are modeled and simulated using a high-fidelity simulation of OpenMC code in terms of criticality and fuel pin power distribution. Various problems have been selected from VERA benchmark ranging from a simple two-dimension (2D) pin cell problem to a complex three dimension (3D) full core problem. The development of the code capabilities for reactor physics methods has been implemented to investigate the accuracy and performance of the OpenMC code against VERA SCALE codes. The results of OpenMC code exhibit excellent agreement with VERA results with maximum Root Mean Square Error (RMSE) values of less than 0.04% and 1.3% for the criticality eigenvalues and pin power distributions, respectively. This demonstrates the successful utilization of the OpenMC code as a simulation tool for a whole core analysis. Further works are undergoing on the accuracy of OpenMC simulations for the impact of different fuel types and burnup levels and the analysis of the transient behavior and coupled thermal hydraulic feedback.

High performance 3D pin-by-pin neutron diffusion calculation based on 2D/1D decoupling method for accurate pin power estimation

  • Yoon, Jooil;Lee, Hyun Chul;Joo, Han Gyu;Kim, Hyeong Seog
    • Nuclear Engineering and Technology
    • /
    • 제53권11호
    • /
    • pp.3543-3562
    • /
    • 2021
  • The methods and performance of a 3D pin-by-pin neutronics code based on the 2D/1D decoupling method are presented. The code was newly developed as an effort to achieve enhanced accuracy and high calculation performance that are sufficient for the use in practical nuclear design analyses. From the 3D diffusion-based finite difference method (FDM) formulation, decoupled planar formulations are established by treating pre-determined axial leakage as a source term. The decoupled axial problems are formulated with the radial leakage source term. To accelerate the pin-by-pin calculation, the two-level coarse mesh finite difference (CMFD) formulation, which consists of the multigroup node-wise CMFD and the two-group assembly-wise CMFD is implemented. To enhance the accuracy, both the discontinuity factor method and the super-homogenization (SPH) factor method are examined for pin-wise cross-section homogenization. The parallelization is achieved with the OpenMP package. The accuracy and performance of the pin-by-pin calculations are assessed with the VERA and APR1400 benchmark problems. It is demonstrated that pin-by-pin 2D/1D alternating calculations within the two-level 3D CMFD framework yield accurate solutions in about 30 s for the typical commercial core problems, on a parallel platform employing 32 threads.

Development and validation of FRAT code for coated particle fuel failure analysis

  • Jian Li;Ding She;Lei Shi;Jun Sun
    • Nuclear Engineering and Technology
    • /
    • 제54권11호
    • /
    • pp.4049-4061
    • /
    • 2022
  • TRISO-coated particle fuel is widely used in high temperature gas cooled reactors and other advanced reactors. The performance of coated fuel particle is one of the fundamental bases of reactor safety. The failure probability of coated fuel particle should be evaluated and determined through suitable fuel performance models and methods during normal and accident condition. In order to better facilitate the design of coated particle fuel, a new TRISO fuel performance code named FRAT (Fission product Release Analysis Tool) was developed. FRAT is designed to calculate internal gas pressure, mechanical stress and failure probability of a coated fuel particle. In this paper, FRAT was introduced and benchmarked against IAEA CRP-6 benchmark cases for coated particle failure analysis. FRAT's results agree well with benchmark values, showing the correctness and satisfactory applicability. This work helps to provide a foundation for the credible application of FRAT.

UltraSPARC(64bit-RISC processor)을 위한 고성능 컴퓨터 리눅스 클러스터링 (HPC(High Performance Computer) Linux Clustering for UltraSPARC(64bit-RISC processor))

  • 김기영;조영록;장종권
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
    • /
    • pp.45-48
    • /
    • 2003
  • We can easily buy network system for high performance micro-processor, progress computer architecture is caused of high bandwidth and low delay time. Coupling PC-based commodity technology with distributed computing methodologies provides an important advance in the development of single-user dedicated systems. Lately Network is joined PC or workstation by computers of high performance and low cost. Than it make intensive that Cluster system is resembled supercomputer. Unix, Linux, BSD, NT(Windows series) can use Cluster system OS(operating system). I'm chosen linux gain low cost, high performance and open technical documentation. This paper is benchmark performance of Beowulf clustering by UltraSPARC-1K(64bit-RISC processor). Benchmark tools use MPI(Message Passing Interface) and NetPIPE. Beowulf is a class of experimental parallel workstations developed to evaluate and characterize the design space of this new operating point in price-performance.

  • PDF

Benchmark tests of MITC triangular shell elements

  • Jun, Hyungmin;Mukai, Paul;Kim, San
    • Structural Engineering and Mechanics
    • /
    • 제68권1호
    • /
    • pp.17-38
    • /
    • 2018
  • In this paper, we compare and assess the performance of the standard 3- and 6-node MITC shell elements (Lee and Bathe 2004) with the recently developed MITC triangular elements (Lee et al. 2014, Jeon et al. 2014, Jun et al. 2018) which were based on the partitions of unity approximation, bubble node, or both. The convergence behavior of the shell elements are measured in well-known benchmark tests; four plane stress tests (mesh distortion test, cantilever beam, Cook's skew beam, and MacNeal beam), two plate tests (Morley's skew plate and circular plate), and six shell tests (curved beam, twisted beam, pinched cylinder, hemispherical shells with or without hole, and Scordelis-Lo roof). To precisely compare and evaluate the solution accuracy of the shell elements, different triangular mesh patterns and distorted element mesh are adopted in the benchmark problems. All shell finite elements considered pass the basic tests; namely, the isotropy, the patch, and the zero energy mode tests.

프로세싱 인 메모리 시스템에서의 PolyBench 구동에 대한 동작 성능 및 특성 분석과 고찰 (Performance Analysis and Identifying Characteristics of Processing-in-Memory System with Polyhedral Benchmark Suite)

  • 김정근
    • 반도체디스플레이기술학회지
    • /
    • 제22권3호
    • /
    • pp.142-148
    • /
    • 2023
  • In this paper, we identify performance issues in executing compute kernels from PolyBench, which includes compute kernels that are the core computational units of various data-intensive workloads, such as deep learning and data-intensive applications, on Processing-in-Memory (PIM) devices. Therefore, using our in-house simulator, we measured and compared the various performance metrics of workloads based on traditional out-of-order and in-order processors with Processing-in-Memory-based systems. As a result, the PIM-based system improves performance compared to other computing models due to the short-term data reuse characteristic of computational kernels from PolyBench. However, some kernels perform poorly in PIM-based systems without a multi-layer cache hierarchy due to some kernel's long-term data reuse characteristics. Hence, our evaluation and analysis results suggest that further research should consider dynamic and workload pattern adaptive approaches to overcome performance degradation from computational kernels with long-term data reuse characteristics and hidden data locality.

  • PDF

CMFston:유닉스 기반의 합성 사용자 프로그래밍 벤치마크 (CMFston : Synthetic User Programming Benchmark Based on UNIX)

  • 이시진;박성욱;권혁인
    • 한국정보처리학회논문지
    • /
    • 제3권5호
    • /
    • pp.1215-1228
    • /
    • 1996
  • 벤치마크는 컴퓨터 시스템의 성능을 측정하기 위한 프로그램이며, 컴퓨터 시스템 의 성능은 사용자가 실행하는 응용 프로그램의 실행되는 속도에 의해서 결정 된다. 따라서, 컴퓨터 시스템의 성능을 정확히 측정하기 위한 벤치마크 프로그램은 사용자가 실행시키는 응용 프로그램과 동일한 동작 특성을 가져야 한다. 본 연구에 서는, Chaustone, Mchaustone, Fhsstone으로 이루어진 벤치마크 프로그램인 CMFstone을 구현 한다. CNFstone을 구현·실행한 결과, 다른 여러 벤치마크를 실행한 결과의 평균과 유사한 측정 결과를 보였다. 따라서, 컴퓨터 시스템의 성능 측정을 위해서 여러 벤치 마크를 실행할 필요 없이, CMFstpme을 실행시키는 것만으로도 다양한 성능 측정이 가능하다.

  • PDF