• Title/Summary/Keyword: Data-driven simulation

Search Result 242, Processing Time 0.031 seconds

The effect of error sources on the results of one-way nested ocean regional circulation model

  • Sy, Pham-Van;Hwang, Jin Hwan;Nguyen, Thi Hoang Thao;Kim, Bo-ram
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2015.05a
    • /
    • pp.253-253
    • /
    • 2015
  • This research evaluated the effect of two main sources on the results of the ocean regional circulation model (ORCMs) during downscaling and nesting the results from the coarse data. The two sources should be the domain size, and temporal and spatial resolution different between driving and driven data. The Big-Brother Experiment is applied to examine the impact of them on the results of the ORCMs separately. Within resolution of 3km grid point ORCMs applying in the Big-Brother Experiment framework, it showed that the simulation results of the ORCMs depend on the domain size and specially the spatial and temporal resolution of lateral boundary conditions (LBCs). The domain size can be selected at 9.5 times larger than the interest area, and the spatial resolution between driving data and driven model can be up to 3 of ratio resolution and updating frequency of the LBCs can be up to every 6 hours per day.

  • PDF

A Development of Flood Mapping Accelerator Based on HEC-softwares (HEC 소프트웨어 기반 홍수범람지도 엑셀러레이터 개발)

  • Kim, JongChun;Hwang, Seokhwan;Jeong, Jongho
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.44 no.2
    • /
    • pp.173-182
    • /
    • 2024
  • In recent, there has been a trend toward primarily utilizing data-driven models employing artificial intelligence technologies, such as machine learning, for flood prediction. These data-driven models offer the advantage of utilizing pre-training results, significantly reducing the required simulation time. However, it remains that a considerable amount of flood data is necessary for the pre-training in data-driven models, while the available observed data for application is often insufficient. As an alternative, validated simulation results from physically-based models are being employed as pre-training data alongside observed data. In this context, we developed a flood mapping accelerator to generate flood maps for pre-training. The proposed accelerator automates the entire process of flood mapping, i.e., estimating flood discharge using HEC-1, calculating water surface levels using HEC-RAS, simulating channel overflow and generating flood maps using RAS Mapper. With the accelerator, users can easily prepare a database for pre-training of data-driven models from hundreds to tens of thousands of rainfall scenarios. It includes various convenient menus containing a Graphic User Interface(GUI), and its practical applicability has been validated across 26 test-beds.

Simulation Skills of RegCM4 for Regional Climate over CORDEX East Asia driven by HadGEM2-AO (CORDEX 동아시아 지역에서 HadGEM2-AO를 경계조건으로 처방한 RegCM4의 상세 지역기후 모의성능)

  • Oh, Seok-Geun;Suh, Myoung-Seok;Cha, Dong-Hyun;Choi, Suk-Jin
    • Journal of the Korean earth science society
    • /
    • v.32 no.7
    • /
    • pp.732-749
    • /
    • 2011
  • In this study, 27-year (1979-2005) regional climate over the CORDEX East Asia domain was reproduced using a regional climate model, RegCM4, driven by HadGEM2-AO output, and the model's simulation skill was evaluated in terms of surface air temperature and precipitation. The RegCM4 reasonably simulated the spatial distribution and interannual variability and seasonal variability of surface air temperature, while it had systematic biases in the simulation of precipitation. In particular, simulated rainband of East Asian summer monsoon was southward shifted below $30^{\circ}N$ as compared with the observation, thereby, summer mean precipitation over South Korea was significantly underestimated. Simulated temperature from the RegCM4 driven by the HadGEM2-AO output was comparable to that driven by the reanalysis. However, the RegCM4 driven by the HadGEM2-AO had prominently poor skill in the simulation of precipitation. This can be associated with the distorted monsoon circulations in the driving data (i.e., HadGEM2-AO) such as southward shifted low-level southwesterly, which resulted in the erroneous evolution of East Asian summer monsoon simulated by RegCM4.

Experiences with Simulation Software for the Analysis of Inverter Power Sources in Arc Welding Applications

  • Fischer W.;Mecke H.;Czarnecki T.K.
    • Proceedings of the KIPE Conference
    • /
    • 2001.10a
    • /
    • pp.731-736
    • /
    • 2001
  • Nowadays various simulation tools are widely used for the design and the analysis of power electronic converters. From the engineering point of view it is rather difficult to parameterize power semiconductor device models without the knowledge of basic physical parameters. In recent years some data sheet driven behavioral models or so called 'wizard' tools have been introduced to solve this problem. In this contribution some experiences with some user-friendly power semiconductor models will be discussed. Using special simulation test circuits it is possible to get information on the static and dynamic behavior of the parameterized models before they are applied in more complex schemes. These results can be compared with data sheets or with measurements. The application of these models for power loss analysis of inverter type arc welding power sources will be described.

  • PDF

Avoiding Inter-Leg Collision for Data-Driven Control (데이터 기반보행 제어를 위한 다리 간 충돌 회피 기법)

  • Lee, Yoonsang
    • Journal of the Korea Computer Graphics Society
    • /
    • v.23 no.2
    • /
    • pp.23-27
    • /
    • 2017
  • We propose an inter-leg collision avoidance method that compensates the disadvantage of the data-driven biped control method. The data-driven biped control technique proposed by Lee et. al [1] sometimes generates the movement that the two legs intersect with each other while walking, which can not be realized in walking of a real person or a biped robot. The proposed method changes the angle of the swing hip so that the swing foot can move inward only after passing the stance foot. This process introduces an additional angle adjustment algorithm to avoid collisions with the stance leg to the original feedback rule of the stance hip. It generates a stable walking simulation without any inter-leg collisions, by adding minimal changes and additional calculations to the existing controller behavior.

Data driven approach for information system adoption: Applied in CRM case (데이터 중심의 정보 시스템 도입 방법론: 고객관계관리 시스템에의 적용 사례)

  • Park, Jong-Han;Lee, Seok-Kee
    • Journal of the Korean Data and Information Science Society
    • /
    • v.21 no.2
    • /
    • pp.251-262
    • /
    • 2010
  • While outsourcing has become a basic strategy of the information system adoption, there is an emerging needs to analyze the gap between the required data and the existing data for the new system from an adopting company's perspective. In CRM adoption failure cases, the first reason is adopting company pay no attention to the data that will support investment and systems. So far, there is no attempt to consider data driven approach in information system adoption field. Hence, we propose Information System Adoption Model based on Data (ISAMD) and show how to use in real world by simulation. By using ISAMD, information system adoption decision maker can simulate the needed data and related cost with various information system alternatives in short term, and long term planning. ISAMD can prevent the possible threat of unexpected data cost in adopting new system at the adopting decision stage.

Improving Inspection Systems for Radio Stations: An Emphasis on the ISO 2859-1 Sampling Method (무선국 검사제도 개선방안에 관한 연구: ISO 2859-1 샘플링 검사기법을 중심으로)

  • Hyojung Kim;Yuri Kim;Sina Park;Seunghwan Jung;Seongjoon Kim
    • Journal of Korean Society for Quality Management
    • /
    • v.51 no.4
    • /
    • pp.515-530
    • /
    • 2023
  • Purpose : This research aims to develop a data-driven inspection policy for radio stations utilizing the KS Q ISO 2859-1 sampling method, addressing potential regulatory relaxations and impending management challenges. Methods : Using radio station inspection big data from the past six years, we established a simulation model to evaluate the current policy. A new inspection sampling policy framework was designed based on the KS Q ISO 2859-1 method. The study compares the performance of the current and proposed inspection systems, offering insights for an improved inspection strategy. Results : This study introduced a simulation model for inspection system based on the KS Q ISO 2859-1 sampling method. Through various experimental designs, key performance indicators such as non-detection rate and sample proportion were derived, providing foundational data for the new inspection policy. Conclusion : Using big data from radio station inspections, we evaluated current inspection systems and quantitatively compared a new system across diverse scenarios. Our simulation model effectively verified the feasibility and efficiency of the proposed framework. For practical implementation, essential factors such as lot size, inspection cycle, and AQL standards need precise definition and consideration. Enhancing radio station inspections requires a policy-driven approach that factors in socio-economic impacts and solicits feedback from industry participants. Future study should also explore various perspectives related to legislative, institutional, and operational aspects of inspection organizations.

Wind-Driven Circulation Using a Curvilinear Hydrodynamic Three-Dimensional Model (곡선형격자 삼차원 수치모형을 이용한 바람에 의한 물의 순환)

  • Lee, Hye-Keun
    • Journal of Korean Society of Coastal and Ocean Engineers
    • /
    • v.6 no.1
    • /
    • pp.1-11
    • /
    • 1994
  • A curvilinear hydrodynamic three-dimensional model is presented for the study of wind-driven circulation in a shallow lake. Numerical results are compared with field data. Thermal stratification effects were found to be critical to the successful simulation of circulation under increasing winds. When there ate insufficient meteorological data, the so-called inverse method can be used for the estimation of heat flux.

  • PDF

A Data-Driven Activity Monitoring Method for Abnormal Sales Behavior Detection (이상 판매활동을 탐지하기 위한 데이터 기반 활동 모니터링 기법)

  • Park, Sungho;Kim, Seoung Bum
    • Journal of Korean Institute of Industrial Engineers
    • /
    • v.40 no.5
    • /
    • pp.492-500
    • /
    • 2014
  • Activity monitoring has been widely recognized as important and critical tools in system monitoring for detection of abnormal behavior. In this research, we propose a data-driven activity monitoring method to measure relative sales performance which is not sensitive to special event which frequently occur in marketing area. Moreover, the proposed method can automatically updates the monitoring threshold that accommodates a drastically changing business environment. The results from simulation and practical case study from sales of electronic devices demonstrate the usefulness and applicability of the proposed activity monitoring method.

A Buoy Drifting Simulation in the Korea Strait (대한해협의 부표표류 시뮬레이션)

  • 최병호;김경환;김영규;방인권
    • Journal of Korean Society of Coastal and Ocean Engineers
    • /
    • v.7 no.4
    • /
    • pp.379-392
    • /
    • 1995
  • An initial attempt to establish predictive system of sea surface current and trajectories of drifting bodies for seas adjacent to Korea is described. A predictive system for the Korea Strait area was first set up based on Data Tables for surface tidal currents, surface wind-driven currents and density-driven currents. Simulations thus performed were in general agreements with satellite tracking buoy observations available in this region.

  • PDF