정보시스템 아키턱처 시뮬레이션에 관한 연구

이병상 ( Byung Sang Lee ),조경섭 ( Kyoung Sup Cho ),양재권 ( Jae Kwon Yang ),안병찬 ( Byung Chan Ahn ),서용원 ( Yong Won Seo ) (주)엘지씨엔에스(구 LGCNS 엔트루정보기술연구소) 2010 Entrue Journal of Information Technology Vol.9 No.2

시뮬레이션은 비즈니스 운영 시스템 및 유효성과 성능을 검증하기 위한 일반적인 방법으로 활용되고 있다. 정보시스템의 아키텍처 설계 시에도 시뮬레이션을 적용하면 생산성 향상을 도모할 수 있으나, 정보시스템 아키텍처 설계를 위해 개발된 시뮬레이션 도구는 찾아보기 어려운 실정이다. 이에 따라, 본 연구는 정보시스템 아키텍처 시뮬레이션 도구를 개발하는 것을 목적으로 한다. 시뮬레이션 도구를 개발하기 위해 시스템 모델을 별도로 개발하였으며 시뮬레이션 결과의 정확성을 확보하기 위해 실제 프로젝트에서의 성능 테스트 결과를 이용하였다. 본 연구에서 개발된 시뮬레이션 도구는 다양한 조건에서 아키텍처 구성의 적합성을 검증하고 시스템 성능을 시뮬레이션 할 수 있어 아키텍처 구성 및 용량 산정 등에 활용함으로써 아키텍처 작업에 실질적인 도움이 될 것으로 기대된다. Simulation is a popular method in verifing validity and performance of business operation systems. While similar benefits of simulation can be expected in information system architecture design, there have been few practical simulation tools that can be applied to information system architecture design. Thus, the purpose of this research is to develop a system architecture simulation tool, which is named “the architecture simulator.” This tool can verify the validity of the architectural configurations and simulate the performance of the system in various settings. To implement the simulation tool, the system model has been developed and field-test results are used to secure the accuracy of the simulation results. The architecture simulator is expected to be practically utilized in the architectural configuration and the capacity planning.

시스템수준 시뮬레이션과 디스크 I/O수준 시뮬레이션 연동을 위한 DEVSim++과 DiskSim 사이의 인터페이스 설계 및 구현

송해상(Hae Sang Song),이순주(Sun Ju Lee) 한국컴퓨터정보학회 2013 韓國컴퓨터情報學會論文誌 Vol.18 No.4

본 논문은 분산 스토리지 시스템과 같이 디스크를 내장하고 있는 다수의 컴퓨터 노드로 구성되어 있는 스토리지 시스템에서 개개의 디스크 스펙 변화에 따른 전체 성능을 분석하고자 할 때 잘 알려져 있는 블록 I/O 수준의 디스크 시뮬레이터인 DiskSim과 시스템수준의 시뮬레이터와의 연동을 위한 인터페이스의 설계 및 구현에 관한 기법을 제안하였다. 본 연구에서 시스템수준 시뮬레이션 엔진으로는 계층적이고 모듈러한 모델링 기법을 지원하는 DEVS 형식론을 지원하는 범용 이산사건시스템 시뮬레이션 엔진인 DEVSim++을 목표로 하였고 이식성을 위해 DiskSim과 DEVSim++ 시뮬레이션 엔진의 내부는 수정하지 않는 것을 가정하였다. 이를 만족하기 위해 I/O 수준의 DiskSim 시뮬레이터와 시스템 수준의 DEVSim++ 기반 시뮬레이터 사이의 연동 인터페이스 구조를 제안하였다. 이 구조에서는 여러 인스턴스의 DiskSim을 관리하는 DiskSimManager의 개념을 도입하여 I/O 수준 시뮬레이션과 시스템 수준 시뮬레이션 간의 시간과 사건(데이터) 동기화를 담당하도록 설계하였고, 시스템 수준의 DEVS 모델에서 간편하게DiskSim을 접근할 수있도록 감싸는 DEVS wrapper 모델을 제안하였다. 벤치마크 실험결과 설계 구현된 연동 인터페이스를 사용한 시뮬레이션 결과는 DiskSim만의 단독 시뮬레이션 결과와 정확히 일치함을 확인함으로써 설계 구현된 연동 인터페이스가 목적에 맞게 잘 동작함을 입증하였다. This paper deals with the design and implementation of an interface for interoperation between DiskSim, a well-known disk simulator, and a system-level simulator based on DEVSim++. Such inter-operational simulation aims at evaluation of an overall performance of storage systems which consist of multiple computer nodes with a variety of I/O level specifications. A well-known system-level simulation framework, DEVSim++ environment is based on the DEVS formalism, which provides a sound semantics of modular and hierarchical modeling methodology at the discrete event systems level such as multi-node computer systems. For maintainability we assume that there is no change of the source codes for two heterogeneous simulation engines. Thus, we adopt a notion of simulators interoperation in which there should be a means to synchronize simulation times as well as to exchange messages between simulators. As an interface for such interoperation DiskSimManager is designed and implemented. Various experiments, comparing the results of the standalone DiskSim simulation and the interoperation simulation using the proposed interface of DiskSimManager, proved that DiskSimManager works correctly as an interface for interoperation between DEVSim++ and DiskSim.

RecurDyn과 Matlab/Simulink를 연동한 전동기 구동시스템의 시뮬레이션

김상훈 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A

For an accurate computer simulation to motor drive systems, the target mechanical load system driven by a motor needs to be model its characteristics accurately. In general, a load system is modeled simply with system parameters such as approximated system inertia and friction. So, simulation results have some errors compared with experimental results for a real load system. RecurDyn is a mechanics simulation program for 3-dimension analysis to mechanical load systems. From this program, parameters such as a load torque, a system inertia and a viscous friction can be obtained accurately which are required to model a mechanical system. Also, this program operates together Matlab/Simulink which is used to simulate electrical motor drive systems. So, an accurate simulation for the whole system with a motor drive system and a mechanical load is possible. This paper introduces an application of RecurDyn program to an electric forklift drive system using IPMSM(Interior Permanent Magnet Synchronous Motor) and examines the feasibility of co-simulation it with Matlab/Simulink.

Development of Simulation Model for Hydraulic System of Rice Transplanter using AMESim

( Abu Ayub Siddique ),( Wan-soo Kim ),( Seung-yun Beak ),( Taek-jin Kim ),( Jong-yeal Shim ),( Tae-ho Han ),( Chang-hyun Choi ),( Hae-yoon Tak ),( Yong-joo Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

Rice transplanter is an inevitable advanced technology in agricultural machinery sector. Nowadays, several problems like lower sustainability, brittleness are facing with existing electronic control devices applied in the hydraulic system of rice transplanters. In addition, mechanized transplanters are gradually decreasing its demand due to the technological gap with developed countries like USA, Japan, and so on. Hence, it is emergency to upgrade those mechanized technologies for the longevity of the machine using advanced electronic control devices. At present, performance evaluation of machinery is performed by simulation because of being cost-effective, time-consuming, and required lower labors. Therefore, the objectives of this study are to develop and simulate a transplanter simulation model using commercial simulation software, and optimization of the model for the quality enhancement, and finally performance evaluation of rice transplanter. The hydraulic system of rice transplanter (Yanmar YR6D) is composed of the engine, hydrostatic transmission (HST), hydraulic pump, power assisted steering mechanism, horizontal control system, and ascending/descending system. The parameters of the simulation were the input and output torque, power, and the rotational speed of hydraulic pump and motor. The simulation was performed in three conditions of the engine power like the ideal, rated, and maximum. The efficiency of the HST was determined by operating the transplanter. The engine power was calculated on the basis of the engine torque and rotational speed. All the parameters of the simulation model are considered with respect to real agricultural machinery and actual design criteria. The simulation results were performed in the simulation environment according to the hydraulic pump discharge rate. It is accounted that the highest displacement of the piston for ascending/descend and horizontal control systems were approximately 0.007 m and 0.07 m, respectively. In case of ascending/descending system, it can be noticed that actuator pressure at point 1 was slightly unstable due to the leakage coefficient of the actuator. It was also found that the efficiency of HST was about 71.82%. The simulation model was performed well under the simulation environment. In the future study, it is required to develop control algorithm for the hydraulic system of rice transplanter, and also needed field test for the validation of the model.

공간 시스템 시뮬레이션의 다층화를 위한 동적모델의 특성 분석과 비교

김석태 한국실내디자인학회 2024 한국실내디자인학회논문집 Vol.33 No.4

When designing space remodeling, it is essential to evaluate various scenarios that reflect the demands of project stakeholders and users in terms of cost and efficiency. Preliminary verifications are necessary to minimize the economic and time costs caused by rework and operational shutdowns due to design errors. Historically, preliminary reviews relied on personal experience, which lacked objectivity and scientific basis, resulting in low reliability. However, advancements in dynamic system analysis theories and system simulation technologies now offer new potential as verification tools. This study serves as preliminary research to develop a multilayer simulation optimized for interior design practice. It compares and analyzes Discrete Event Simulation(DES), Agent based Modeling(AB), System Dynamics(SD), and Pedestrian based Event Model(PED), which are widely used in academia and industry, to identify their characteristics. A medium-sized hospital’s health check-up center was used as a case model to perform quantitative and qualitative analyses of the simulation results of these four models under the same conditions, thereby assessing the efficacy and limitations of each model. The study found that DES, PED, and AB showed consistent results, suggesting potential for integration. However, SD exhibited time discrepancies with the other models, indicating limitations in integration and its abstract nature posed challenges for practical application in architectural systems. AB excels in simulating interactions between entities but struggles with spatial object recognition, whereas PED can recognize spatial objects but has difficulty controlling individual entity behaviors. Therefore, a multilayer design that combines AB and PED for mutual complementarity is deemed the most effective approach for realistic architectural space system modeling. Through this research, a theoretical foundation was established for the concept of multilayer system simulation and its application in the field of interior design. To practically apply such complex system simulations, it is essential to prepare accurate base data and set reasonable precision. The use of Monte Carlo simulations to generalize data could be one solution to this challenge.

전문가 시스템에 기반을 둔 교육용 모의 시스템에 관한 연구

김은경 韓國技術敎育大學校 1995 論文集 Vol.2 No.1

This paper proposes an educational simulation system based on an expert system. Firstly, a renal-disease diagnosis expert system called RDES has been developed. RDES diagnoses 10 renal diseases such as chronic renal failure, acute renal failure, acute nephritis, etc. Secondly, an educational simulation system has been designed and implemented using RDES. This educational simulation system consists of graphical user interface, inference engine, knowledge base, database subsystem, diagnosis module, explanation module, simulation diagnosis module, and simulation diagnosis explanation module. The purpose of this simulation system is to assist interns so that they may acquire clinical knowledge within short term. This system has been implemented by using Nexpert Object, dBASEⅢ+, and Open Interface.

Hardware-in-the-loop simulations of an electrohydraulic power steering system for developing the motor speed map of heavy commercial vehicles

Kim, Seong Han,Chu, Chong Nam Professional Engineering Publishing Ltd 2015 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>This study proposes hardware-in-the-loop simulations to develop the motor speed map of electrohydraulic power steering systems for heavy commercial vehicles. The current method that relies on the test driver’s hands and feet to obtain electrohydraulic power steering motor speed maps causes a number of problems, such as inaccurate steering rates and vehicle speeds and the risk of rollover during tests. In order to overcome these weaknesses, this study employs a hardware-in-the-loop simulation system, a vehicle model, and an experimental development method. A hardware-in-the-loop simulation system was set up to simulate a steering system on the road. The system includes a system drive, data acquisition, system controller sets, and an electrohydraulic power steering system. This hardware-in-the-loop simulation system is controlled in real time because the amount of the torque from the resistant torque motor, which applies the self-aligning moments generated between the ground and the tires to the steering system, is affected by the steering angle of the steering-wheel motor. For calculation of the resistant torque with respect to various driving conditions, a vehicle model was employed in this study. It includes calculation of the self-aligning moments with the tire property data, the moments due to the kingpin inclination, the vehicle dynamics, and the steering-system modeling. The resultant values were input into the resistant torque motor. In addition to the hardware-in-the-loop simulation system and the vehicle model, the concept of a desirable steering torque which parameterizes the steering feel was introduced in this study. Using the desirable steering torque, the steering feel could be quantified, and desirable steering feels were established. In this study, in order to validate the hardware-in-the-loop simulations, a heavy commercial vehicle was designated as the target vehicle. The target vehicle’s tire and specifications such as the dimensions, the weight, the steering system, and the mechanical links were adopted, and a desirable steering-torque map was established by a professional test driver. The development results were presented.</P>

레일기반 컨테이너 이송 시스템의 교착에 관한 시뮬레이션 연구

서정훈(Jeong-Hoon Seo),이상혁(․,Sang-Hyuk Yi),김갑환(Kap-Hwan Kim) 한국항해항만학회 2018 한국항해항만학회지 Vol.42 No.1

초대형선박의 등장으로 컨테이너 터미널 생산성의 한계에 직면하고 있으며 이를 해결하기 위한 새로운 개념의 터미널시스템들이 제안되고 있다. 본 논문에서는 개념설계 중인 레일기반 컨테이너 이송시스템을 대상으로 연구한다. 이는 레일 위를 움직이는 무인반송차인 플랫카와 천장형 레일을 따라 움직이는 셔틀크레인으로 구성된 시스템이다. 자동화된 컨테이너 터미널에서 컨테이너 수송 기능을 담당하는 무인반송차의 운영 시 교착과 같은 병목현상은 오랫동안 중요한 문제로 잘 알려져 있다. 따라서 초대형 선박과 같이 대량의 컨테이너 취급하는 신개념의 레일기반 컨테이너 이송시스템에서 발생 가능한 교착 현상을 정의하고 해결방안에 대해 논한다. 교착 현상은 이종장비 간 교착과 플랫카 간 교착문제로 구분하여 소개한다. 본 연구는 시뮬레이션 접근법을 사용하여 레일기반 컨테이너 시스템 모델을 개발한다. 개발된 시뮬 레이션 모델의 실행을 통하여 수송구간에서 발생 가능한 교착 상태를 확인하고 이를 해소하기 위한 교착 회피 규칙을 개발한다. 시뮬레이션 실험을 통하여 교착발생 빈도를 기준으로 교착 회피 규칙들의 성능을 비교한다. In this study, the focus is on the issue of whether a container terminal is facing the limitation of its productivity for serving mega-vessels with numerous containers. In order to enhance the terminal operations, a new conceptual design of the container handling system have been proposed. This research focuses on the rail-based container transport system and its operations. This system consists of rail-based shuttle cranes and rail-based transporters called flatcars. The deadlock problem for managing automated transporters in container terminals has been an important issue for a long measurement of time. Therefore, this study defines the deadlock situation and proposes its avoidance rules at the rail-based container transport system, which is required to handle numerous container throughput operations. The deadlock in the rail-based container transport system is classified into two parts: deadlock between cranes and flatcars; deadlock between flatcars. We developed the simulation model for use with characterizing and analyzing the rail-based container transport system. By running the simulation, we derived possible deadlock situations, and propose the several deadlock avoidance algorithms to provide results for these identified situations. In the simulation experiments, the performances of the deadlock avoidance algorithms are compared according to the frequency of deadlocks as noted in the simulations.

고분자전해질 연료전지 특성 해석을 위한 열관리 계통 모델 기반 HILS 기초 연구

윤진원,한재영,김경택,유상석 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.4

A thermal management system of a proton exchange membrane fuel cell is taken charge of controlling the temperature of fuel cell stack by rejection of electrochemically reacted heat. Two major components of thermal management system are heat exchanger and pump which determines required amount of heat. Since the performance and durability of PEMFC system is sensitive to the operating temperature and temperature distribution inside the stack, it is necessary to control the thermal management system properly under guidance of operating strategy. The control study of the thermal management system is able to be boosted up with hardware in the loop simulation which directly connects the plant simulation with real hardware components. In this study, the plant simulation of fuel cell stack has been developed and the simulation model is connected with virtual data acquisition system. And HIL simulator has been developed to control the coolant supply system for the study of PEMFC thermal management system. The virtual data acquisition system and the HIL simulator are developed under LabVIEWTM Platform and the Simulation interface toolkit integrates the fuel cell plant simulator with the virtual DAQ display and HIL simulator.

링크 레벨 시뮬레이션과 시스템 레벨 시뮬레이션에 의한 WCDMA TDD시스템과 cdma2000시스템 간의 상호간섭분석

차인석,장경희,김성진,최용석 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.7

The capacity of WCDMA TDD system is limited mainly by the interference. So, to achieve the expected performance of WCDMA TDD system and to minimize the interference to cdma2000 system interferences, such as interference within WCDMA TDD system inter-cell interference, and interferences between cdma2000 systems, should be considered carefully. In this paper, by using System-level Simulation, we analyzed the interferences between WCDMA TDD system and cdma2000 system in practical situation based on the exact parameters of 3GPP TR 25.942 and by using System-level Simulation considering Link-level we analyze the interferences between WCDMA TDD system and cdam2000 system. From Simulation Results, we propose the condition for optimizing system capacity considering the interferences between WCDMA TDD system & cdam2000 system WCDMA TDD 시스템의 Capacity는 주로 간섭에 의하여 제한되기 때문에, WCDMA TDD 시스템내의 간섭뿐만 아니라 인접 셀 간섭, 그리고 cdma2000 시스템과의 상호 간섭 효과를 최소화하여야 만이 WCDMA TDD 시스템의 기대용량을 얻을 수 있고, 현재 사용하고 있는 cdma2000 시스템과의 상호간섭을 최소화 할 수 있다. 본 논문에서는 3GPP TR 25.942 를 토대로 보다 정확한 파라미터를 사용하고, 시스템 레벨 시뮬레이션을 통해 WCDMA TDD 시스템과 cdma2000 시스템간의 상호간섭을 다양하고 실질적인 상황 하에서 해석하고, 또한 링크레벨을 고려한 시스템 레벨 시뮬레이션 결과로부터 두 시스템간의 상호간섭을 분석한다. 시뮬레이션 결과로부터 WCDMA TDD 시스템과 cdma2000 시스템 간 상호간섭을 고려한 시스템 용량의 최적화를 위한 조건을 제시한다.