• 제목/요약/키워드: Logic Simulation

검색결과 1,445건 처리시간 0.031초

나노선 기반 논리 회로의 이차원 시뮬레이션 연구 (Two-dimensional numerical simulation study on the nanowire-based logic circuits)

  • 최창용;조원주;정홍배;구상모
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
    • /
    • pp.82-82
    • /
    • 2008
  • One-dimensional (1D) nanowires have been received much attention due to their potential for applications in various field. Recently some logic applications fabricated on various nanowires, such as ZnO, CdS, Si, are reported. These logic circuits, which consist of two- or three field effect transistors(FETs), are basic components of computation machine such as central process unit (CPU). FETs fabricated on nanowire generally have surrounded shapes of gate structure, which improve the device performance. Highly integrated circuits can also be achieved by fabricating on nano-scaled nanowires. But the numerical and SPICE simulation about the logic circuitry have never been reported and analyses of detailed parameters related to performance, such as channel doping, gate shapes, souce/drain contact and etc., were strongly needed. In our study, NAND and NOT logic circuits were simulated and characterized using 2- and 3-dimensional numerical simulation (SILVACO ATLAS) and built-in spice module(mixed mode).

  • PDF

MOS 로직 및 타이밍 시뮬레이션을 위한 데이타구조 및 알고리즘 (A data structure and algorithm for MOS logic-with-timing simulation)

  • 공진흥
    • 전자공학회논문지A
    • /
    • 제33A권6호
    • /
    • pp.206-219
    • /
    • 1996
  • This paper describes a data structure and evaluation algorithm to improve the perofmrances MOS logic-with-timing simulation in computation and accuracy. In order to efficiently simulate the logic and timing of driver-load networks, (1) a tree data structure to represent the mutual interconnection topology of switches and nodes in the driver-lod network, and (2) an algebraic modeling to efficiently deal with the new represetnation, (3) an evaluation algorithm to compute the linear resistive and capacitive behavior with the new modeling of driver-load networks are developed. The higher modeling presented here supports the structural and functional compatibility with the linear switch-level to simulate the logic-with-timing of digital MOS circuits at a mixed-level. This research attempts to integrate the new approach into the existing simulator RSIM, which yield a mixed-klevel logic-with-timing simulator MIXIM. The experimental results show that (1) MIXIM is a far superior to RSIM in computation speed and timing accuracy; and notably (2) th etiming simulation for driver-load netowrks produces the accuracy ranged within 17% with respect ot the analog simulator SPICE.

  • PDF

무선 센서 네트워크에서 에너지 균일 소비를 위해 퍼지로직을 이용한 전송 중계 (Transmission Relay Method for Balanced Energy Depletion in Wireless Sensor Networks Using Fuzzy Logic)

  • 백승범;조대호
    • 한국시뮬레이션학회:학술대회논문집
    • /
    • 한국시뮬레이션학회 2005년도 춘계학술대회 논문집
    • /
    • pp.5-9
    • /
    • 2005
  • One of the imminent problems to be solved within wireless sensor network is to balance out energy dissipation among deployed sensor nodes. In this paper, we present a transmission relay method of communications between BS (Base Station) and CHs (Cluster Heads) for balancing the energy consumption and extending the average lifetime of sensor nodes by the fuzzy logic application. The proposed method is designed based on LEACH protocol. The area deployed by sensor nodes is divided into two groups based on distance from BS to the nodes. RCH (Relay Cluster Head) relays transmissions from CH to BS if the CH is in the area far away from BS in order to reduce the energy consumption. RCH decides whether to relay the transmissions based on the threshold distance value that is obtained as a output of fuzzy logic system. Our simulation result shows that the application of fuzzy logic Provides the better balancing of energy depletion and Prolonged lifetime of the nodes.

  • PDF

기계시각과 퍼지논리를 이용한 스피드스프레이어의 자율주행(I) -그래픽 시뮬레이션- (Autonomous SpeedSprayer Using Machine Vision and Fuzzy Logic (I) -Graphic Simulation-)

  • 조성인;기노훈
    • Journal of Biosystems Engineering
    • /
    • 제21권2호
    • /
    • pp.167-174
    • /
    • 1996
  • A Fuzzy Logic Controller(FLC) was developed for the autonomous operation of speedsprayer in an orchard. The autonomous operation with the FLC was graphically simulated under the real condition of the orchard. Image processing was used to find out the direction of running and four ultrasonic sensors were used to detect obstacles for the running. The simulation results showed that the speedsprayer could be operated autonomously with the FLC combined with the image processing and the ultrasonic sensors.

  • PDF

MDPS 해석 소프트웨어 개발 (MDPS Analysis Software Development)

  • 장봉춘;김정훈;양성모
    • 한국산학기술학회논문지
    • /
    • 제15권9호
    • /
    • pp.5480-5486
    • /
    • 2014
  • 조향계 엔지니어들에게 전동 조향 시스템의 시뮬레이션 및 분석을 위한 새로운 방식의 소프트웨어를 소개한다. 이 소프트웨어 MSAS는 전동 조향 시스템의 시뮬레이션, 분석 및 종합 기능을 제공하며, 기본적으로 조향계 모델과 차량모델 및 제어로직에 기초한다. 부품 공급회사들은 제어로직을 블랙박스 형태로 제공하기 때문에 이 소프트웨어는 로직 설계자의 의도에 따라 블랙박스 형태이든지 또는 화이트박스 형태이든지 모두 사용가능하다. 또한 이 소프트웨어는 공급회사들의 에스함수 제어로직 및 RMDPS와 함께 통합될 수 있다.

Simulation of the Air Conditioning System Using Fuzzy Logic Control

  • Mongkolwongrojn, M.;Sarawit, W.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2003년도 ICCAS
    • /
    • pp.2270-2273
    • /
    • 2003
  • Fuzzy logic control has been widely implemented in air conditioning and ventilation systems which has uncertainty or high robust system. Since the dynamic behaviors of the systems contain complexity and uncertainty in its parameters , several fuzzy logic controllers had been implemented to control room temperature in the field of air conditioning system. In this paper, the fuzzy logic control has been developed to control room temperature and humidity in the precision air conditioning systems. The nonlinear mathematical model was formulated using energy and continuity equations. MATLAB was used to simulate the fuzzy logic control of the multi-variable air conditioning systems. The simulation results show that fuzzy logic controller can reduce the steady-state errors of the room temperature and relative humidity in multivariable air conditioning systems. The offset are less than 0.5 degree Celsius and 3 percent in relative humidity respectively under random step disturbance in heating load and moisture load respectively

  • PDF

탄두 기폭실험 결과를 활용한 워게임모델 모의논리 개발 (Development of Simulation Logic for Wargame Model Based on Warhead Detonation Test Data)

  • 안세일;이용선;최성호;한상우
    • 한국시뮬레이션학회논문지
    • /
    • 제33권2호
    • /
    • pp.13-25
    • /
    • 2024
  • 무기체계의 연구개발에 앞서 예상되는 효과를 분석하는 것은 개발의 목표와 방향 설정을 위해 중요한 요소이다. 하지만 개발 과정에서 완성 단계를 가정하고 효과를 분석하는 것은 쉬운 일이 아니며, 특히 기존에는 없던 새로운 개념의 무기체계의 경우 이러한 어려움은 더욱 크다. 본 연구에서는 기준 시점에서 완료된 설계내용과 개발된 파편탄두의 기폭실험결과를 반영하여 개인용 소형 유도무기에 대한 효과분석을 하였다. 전투효과 분석을 위해 모의도구에서 요구되는 탄의 정확도 도출을 위하여 설계된 탄 형상이 반영된 6-DOF 시뮬레이터를 활용한 몬테카를로 시뮬레이션을 통해 정확도를 산출하였으며, 대인 효과도 도출을 위하여 파편탄두 기폭실험을 수행 후 대인효과도를 도출하였다. 이후 전투모의 도구인 OneSAF(One Semi-Automated Forces)에 도출된 결과를 반영하기 위한 모의논리 개발 방법론을 제시하였다. 제안된 방법론의 적용성을 확인하여 위하여, 적용 무기체계의 테스트 시나리오들로 모의실험을 진행하여 반영한 모의논리가 의도한 대로 작동함을 확인하였다.

병렬처리 논리 시뮬레이션에서 클럭 진행의 개선 (Enhancement of Clock Advancement in Parallel Logic Simulation)

  • 정연모
    • 한국시뮬레이션학회논문지
    • /
    • 제3권2호
    • /
    • pp.15-25
    • /
    • 1994
  • Efficient event evaluation and propagation techniques are proposed to enhance the advancement of simulation clocks of conservative and optimistic logic simulation protocols on parallel processing environments. The first idea of the techniques proposed in this paper is to allow more than one event evaluation per simulation cycle and to pack more than one propagation event in a single message. The second idea is to use advancement windows resulted in good performance in parallelism and execution times.

  • PDF

퍼지 로직 알고리듬을 이용한 차량 구동력 제어 (Vehicle traction control using fuzzy logic algorithm)

  • 박성훈;권동수
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
    • /
    • pp.680-683
    • /
    • 1996
  • The dynamics of the vehicle system has highly nonlinear components such as an engine, a torque converter and variable road condition. This thesis proposes a Fuzzy Logic Algorithm that shows better control performance than Antiwindup PI in the highly nonlinear vehicle system. Traction Control System(TCS), which adjusts throttle valve opening by Fuzzy Logic Algorithm improves vehicle drivability, steerability and stability when vehicle is starting and cornering. When a throttle valve is opened at large degree, Fuzzy Logic Algorithm shows better performances like a small settling time and a small oscillation than Antiwindup PI in simulation. The decreased desired slip ratio improves steerability in the simulation when a vehicle is cornering. The Fuzzy Logic Algorithm has been tested by a 1/5-scale vehicle for tracking the constant desired velocity.

  • PDF

Development of Intelligently Unmanned Combine Using Fuzzy Logic Control -(Graphic Simulation)-

  • N.H.Ki;Cho, S.I.
    • 한국농업기계학회:학술대회논문집
    • /
    • 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
    • /
    • pp.1264-1272
    • /
    • 1993
  • The software for unmanned control of three row typed rice combine has been developed using fuzzy logic. Three fuzzy variables were used : operating status of combine, steering, and speed. Eleven fuzzy rules were constructed and the eleven linguistic variables were used for the fuzzy rules. Six sensors were use of to get input values and sensor input values were quantified into 11 levels. The fuzzy output was infered with fuzzy inferrence which uses the correlation product encoding , and it must have been defuzzified by the method of center of gravity to use it for the control. The result of performance test using graphic simulation showed that the intelligently unmanned control of a rice combine was possible using fuzzy logic control.

  • PDF