• 제목/요약/키워드: surface program

검색결과 2,064건 처리시간 0.032초

개인용 컴퓨터를 이용한 3차원 유한요소 등가곡선 프로그램 개발 (Equi-Value Line Program Development for 3-Dimensional Finite Element Models using Personal Computer)

  • 이석순
    • 한국정밀공학회지
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    • 제9권1호
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    • pp.44-52
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    • 1992
  • A post-processor is developed to be effectively usable in the personal computer. 3-dimensional controur lines are shown on the surface of the finite element model and also on the 3-dimensional cutting plane, using the function linearly interpolated onto the triangular elements which are constructed on the surface or sectional polygons. And these polygons are originated from the finite element model, 3-dimensional model is projected on the plane with hidden line removal by comparision technique[6]. The graphic data file is used to increase the protability of the program. It is easy to use in the other computer system if the graphic routine adopted that computer system is developed. The developed program has wide applications in 3-dimensional finite element analysis.

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다기능 표면실장기의 공정계획 프로그램 개발 (Development of the Process Planning Program for a Multi-functional Surface Mounting Device)

  • 손진현;유성열;강장하;박성수;오병준;성필영
    • 산업공학
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    • 제10권1호
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    • pp.155-167
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    • 1997
  • The purpose of this study is to develop the program for efficient operation of a multi-functional surface mounting device(SMD) which mount various components on a printed circuit board(PCB). These components are provided by diverse types of feeders such as cassette, stick and tray feeders. The SMD has one or two heads. In the SMD, the positions of PCB and feeders and fixed, and the head moves to pick up a component from a feeder and to mount it on the PCB. The number of lanes occupied by each feeder and the nozzle used for each component can be different. We develop an off-line program to minimize the cycle-time of the SMD by studying the optimal assignment of feeders and the optimal mounting sequence of components. Graphical User Interface(GUI) is also developed. Additionally, we consider the line balancing problem which appears when two SMDs are used sequentially.

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알루미늄 돔 구조물에서 표면의 삼각형 최적 형상 모델링 (Modeling of the triangle optimum shape in the surface of an Aluminum dome structure)

  • 이성철;조종두
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.647-650
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    • 1997
  • A complete dome structure is based on a basic dome modeling, and the basic dome modeling affects safety of the dome structure. In other to save the manufacture expenses, an optimum shape modeling of a dome structure is necessary work of before manufacture of the dome. In this study, modeling of the triangle optimum shape in the surface of an aluminum dome is more focused to optimize shape of the dome and save manufacture expenses. After being made the systematic procedure of the basic modeling, the programming work of the procedure is performed. The program is made by C language, and the trust of the program is proved by comparison between output data of the program and basic modeling in PATRAN.

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감조하천에서의 저수위 유량산정 다중회귀식 개발 (Development of Regression Equation for Water Quantity Estimation in a Tidal River)

  • 이상진;류경식;이배성;윤종수
    • 한국물환경학회지
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    • 제23권3호
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    • pp.385-390
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    • 2007
  • Reliable flow measurement for dry season is very important to set up the in-stream flow exactly and total maximum daily load control program in the basin. Especially, in the points which tidal current effects are dominant because reliability of the low measurement decrease. The reliable measuring methods are needed. In this study, we analysis the water surface elevation difference of water surface elevation. Quantity relationship to consider tidal currents in these regions. It is known that tidal current effects from Nakdong river barrage are dominant in Samrangjin measuring station. We developed multiple regression equation with water surface elevation, quantity, and difference of water surface elevation and compared these results water measured rating curve. All of these regression equation including linear regression equation and log regression equation fits better measured data them existing water surface elevation quantity line and Among three equations, the log regression equation is best to represent the measured the rating curve in Samrangjin point. The log regression equation is useful method to obtain the quantity in the regions which tidal currents are dominant.

실시간 야지주행 시뮬레이션을 위한 3차원 가상노면의 구성 및 적용에 대한 연구 (Study on the 3D Virtual Ground Modeling and Application for Real-time Vehicle Driving Simulation on Off-road)

  • 이정한;유완석
    • 한국자동차공학회논문집
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    • 제18권4호
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    • pp.92-98
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    • 2010
  • Virtual ground modeling is one of key topic for real-time vehicle dynamic simulation. This paper discusses about the virtual 3D road modeling process using parametric surface concept. General road data is a type of lumped position vector so interpolation process is required to compute contact of internal surface. The parametric surface has continuity and linearity within boundaries and functions are very simple to find out contact point. In this paper, the parametric surface formula is adopted to road modeling to calculate road hight. Position indexing method is proposed to reduce memory size and resource possession, and a simple mathematical method for contact patch searching is also proposed. The developed road process program is tested in dynamic driving simulation on off-road. Conclusively, the new virtual road program shows high performance of road hight computation in vast field of off-road simulation.

Immobilization of Horseradish Peroxidase to Electrochemically Deposited Gold-Nanoparticles on Glassy Carbon Electrode for Determination of H2O2

  • Ryoo, Hyun-woo;Kim, You-sung;Lee, Jung-hyun;Shin, Woon-sup;Myung, No-seung;Hong, Hun-Gi
    • Bulletin of the Korean Chemical Society
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    • 제27권5호
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    • pp.672-678
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    • 2006
  • A new approach to fabricate an enzyme electrode was described based on the immobilization of horseradish peroxidase (HRP) on dithiobis-N-succinimidyl propionate (DTSP) self-assembled monolayer (SAM) formed on gold-nanoparticles (Au-NPs) which were electrochemically deposited onto glassy carbon electrode (GCE) surface. The overall surface area and average size of Au-NPs could be controlled by varying deposition time and were examined by Field Emission-Scanning Electron Microscope (FE-SEM). The $O_2$ reduction capability of the surface demonstrated that Au-NPs were thermodynamically stable enough to stay on GCE surface. The immobilized HRP electrode based on Au-NPs/GCE presented faster, more stable and sensitive amperometric response in the reduction of hydrogen peroxide than a HRP immobilized on DTSP/gold plate electrode not containing Au-NPs. The effects of operating potential, mediator concentration, and pH of buffer electrolyte solution on the performance of the HRP biosensor were investigated. In the optimized experimental conditions, the HRP immobilized GCE incorporating smaller-sized Au-NPs showed higher electrocatalytic activity due to the high surface area to volume ratio of Au-NPs in the biosensor. The HRP electrode showed a linear response to $H_2O_2$ in the concentration range of 1.4 $\mu$M-3.1 mM. The apparent Michaelis-Menten constant ($K _M\; ^{app}$) determined for the immobilized HRP electrodes showed a trend to be decreased by decreasing size of Au-NPs electrodeposited onto GCE.

Submental Surface EMG during Dry and Wet Swallowing in Normal Women

  • Yun, Young-Sun;Kim, Hyang-Hee;Baek, Chung-Hwan;Son, Young-Ik
    • 음성과학
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    • 제13권1호
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    • pp.85-94
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    • 2006
  • The aim of this study was to examine the characteristics in duration and amplitude of the submental muscle activities during dry and wet swallowing. We examined the middle suprahyoid muscle activities in 32 normal adult women during three swallowing conditions, that is, dry as well as 5 mL & 10 mL water swallowings, using a surface EMG. From the results, there were significant differences in duration: the longest in dry swallowing and shortest in 5 mL water swallowing. However, the mean amplitude per msec increased as the duration decreased. This may imply motor equivalence in swallowing stating that duration and amplitude are complementary in order to achieve a given swallowing goal.

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단거리 지대공 유도무기에서의 시선지령식 유도법칙과 비례항법 유도법칙의 성능비교 (Performance Comparisons between Command to Line-of-Sight Guidance Law and Proportional Navigation Guidance Law in Short Range Surface-to-Air Missile)

  • 이연석;유악환;김양우
    • 제어로봇시스템학회논문지
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    • 제13권3호
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    • pp.273-278
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    • 2007
  • In this paper, a performance comparison between CLOS(Command to Line-of-Sight) guidance law and PN(Proportional Navigation) guidance law is made, based on a short range surface-to-air missile simulation program called KNUCLOS. This simulation program has a full nonlinear aerodynamic missile model, a tracker model for missile and target, and target model. According to the simulation results, the PN guidance law has a better performance than CLOS guidance law under various target speed.

삼차원 곡면에 대한 접촉해석기법의 개발 (Development of Contact Algorithms for Three Dimensional Surfaces)

  • 박채현;박종진
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1994년도 추계학술대회 논문집
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    • pp.157-164
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    • 1994
  • Finite element analysis of material deformation is successfully utilized to understand metal forming processes such as forging, extrusion and deep drawing. However, such analysis involves contact problems; a free node touches a die surface and a contact node slips along the die surface. In the present investigation, appropriate contact algorithms were developed assuming that a three dimensional surface can be divided into bilinear patches and that nodal velocities are linear during an incremental time. The algorithms were coded into a computer program and tested for a simple surface. Comparison of the test result with that obtained from a commercial code is presented and discussed.

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AC 서보모터 제어 프로그램 구조 설계 및 구현 (Structure Design and Implementation of AC Servo Motor Control Program)

  • 김경아;최준영
    • 대한임베디드공학회논문지
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    • 제18권5호
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    • pp.209-215
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    • 2023
  • This study proposes an AC servo motor control program structure and its implementation method to efficiently integrate 13 types of additional compensation algorithms into the basic FOC (field-oriented control) algorithm program. Various compensation algorithms are necessary to enhance the stability and performance of machine tools by compensating for interference from disturbances and vibrations. Each compensation algorithm is implemented as a separate, independent function and called from a switch-case statement in the ISR (interrupt service routine) of the PWM (pulse-width modulation) device. The advantages of this approach include facilitating not only debugging and testing but also reducing the possibility of errors during the program development phase. Thus, it is easy to add and activate each specific compensation algorithm for the program update during the program operation phase. The implemented motor control program was experimented with a single-axis feed shaft testbed driven by a commercial AC servo motor control drive board and a 750 Watts SPMSM (surface-mounted permanent magnet synchronous motor), and the results verified its normal operation and performance improvement.