• Title/Summary/Keyword: virtual cell

Search Result 231, Processing Time 0.037 seconds

A study of Multiple parallel Characteristics of 50[W] Virtual Implement of 50[W] Solar Cell modules Using Droop-Method (Droop Method를 이용한 50[W]급 태양전지 가상구현장치의 다중병렬연결 출력특성에 관한 연구)

  • Lee Byung-In;Lee Sang-Yong;Jung Byung-Hwan;Choe Gyu-Ha
    • Proceedings of the KIPE Conference
    • /
    • 2003.11a
    • /
    • pp.81-84
    • /
    • 2003
  • For increasing power of photovoltaic systems, serial and parallel connection needed. In parallel connection, a desirable characteristic of parallel-connected supply system is that individual converters share the load current equally and stably. The current sharing(CS) can be implemented using two approaches. The first one, known as a Droop method, and the other is Active current-sharing. In Droop method, current distribution characteristics relies on the high output impedance of each converter. This scheme is more simple and no need interconnections. but also has a disadvantages of degrading current sharing characteristics. In this paper, using droop method at multiful-parallel connection with it's convenience and simplicity.

  • PDF

Wind Tunnel Test of MRP Model using External Balance

  • Chung, Jindeog;Sung, Bongzoo;Cho, Taehwan
    • International Journal of Aeronautical and Space Sciences
    • /
    • v.1 no.2
    • /
    • pp.68-74
    • /
    • 2000
  • A comparative wind tunnel testing of an airplane model was performed at the Korea Aerospace Research Institute Low Speed Wind tunnel(KARI LSWT). The model used for the comparative test was a seaplane model from the Glenn L. Martin Wind(GLM) Tunnel of University of Maryland, U.S.A. The 6-component external balance used in force and moment measurement is pyramidal type, which is a precision device that has strain gauge-type load cell inside of balance and the virtual center of the balance coincides with the tunnel centerline. Image method is adopted to eliminate the tare and interference of the model support, and to correct the flow angularity to the model also. Test results from KARI LSWT were compared with the results from GLM tunnel.

  • PDF

Measurement of Formation Free Energy of $Y_2Cu_2O_5$ by EMF Method (EMF 방법에 의한 $Y_2Cu_2O_5$의 생성자유에너지 측정)

  • 김수권
    • Journal of the Korean Ceramic Society
    • /
    • v.32 no.9
    • /
    • pp.1040-1046
    • /
    • 1995
  • The formation free energy of Y2Cu2O5 was measured by the partial ion exchanged (Cu2+, Na+)-$\beta$/$\beta$"-Al2O3 as solid state electrolyte. The formation cell was built as follows: Pt(O2)/Y2Cu2O5+Y2O3//(Cu2+, Na+)-$\beta$/$\beta$"-Al2O3//CuO/(O2)Pt The virtual formation formation formula, and the calculated formation free energy of Y2Cu2O5 as a function of temperature are as follows: 2CuO+Y2O3=Y2Cu2O5 ΔfG0/kJ.mol-1=13.19-16.25*10-3T/K.5*10-3T/K.

  • PDF

The Study on Activity Star Problem and Optimum Construction Method Through the Defect Case of Zero Energy House in the Existing Building (기축건물의 제로에너지 하우스 하자 사례를 통한 공종별 문제점 및 최적구축 방안에 관한 연구)

  • Kim, Sun-Geun;Kwon, Soon-Wook
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.28 no.4
    • /
    • pp.262-270
    • /
    • 2015
  • In this paper existing buildings, not a new buildings and house for living people not just a displaying and a viewing, created by the imagine effect or virtual simulation was applied various Active and Passive elements. After constructing zero-energy houses, through default case happened during operation period it is described problems and solutions about field part, work classification, installation by Location part, and Installation equipment part. Since then, to take advantage of this thesis, it's the purpose of this paper using as the baseline data for building a zero-energy house in another similar case.

Quantitative Analysis of Biological Models under the Internet Environment (인터넷 환경을 통한 생물학적 모델의 정량적 분석)

  • Yun, Choa-Mun;Lee, Dong-Yup;Cho, A-Youn;Lee, Sang-Yup;Park, Sun-Won
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.11 no.10
    • /
    • pp.837-842
    • /
    • 2005
  • The computational modeling and simulation of complex biological systems are indispensable for new knowledge extraction from huge experimental data and ever growing vast amount of information in systems biology. Moreover, gathering and sharing of the existing information and newly-generated knowledge can speed up this research process. In this regard, several modeling projects have been undertaken for quantitatively analyzing the biological systems via the internet. They include Virtual Cell, JWS and OBIYagns. We also develop an integrated web-based environment, which facilitate investigation of dynamic behavior of cellular systems.

A Multi-physics Simulation and Measurement for Buoyancy of Nonmagnetic Solid Object Submerged in Magnetic Liquid (자성유체에 잠긴 비자성체 부상현상의 다중물리수치해석 및 실험)

  • Choi, Hong-Soon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.1
    • /
    • pp.43-48
    • /
    • 2013
  • In this paper, magnetic buoyancy force on nonmagnetic solid object submerged in magnetic liquid was simulated and measured. For the evaluation of the force, a multi-physics approach of hydrostatic equilibrium considering magnetic body force as well as gravity is presented. The magnetic body force should be regarded as an additional forcing term in the momentum equation of hydrodynamics. It is also shown that the virtual air-gap based Kelvin's force formula is a useful method for the calculation of force distribution in the magnetic liquid. The experimental result which was performed by a load-cell measurement system agreed quantitatively well with the numerical one.

A Study of 3-Dimension Graphic Monitoring System for Spent Fuel Dismantling Process

  • Kim, Sung-Hyun;Song, Tae-Gil;Lee, Jong-Youl;Yoon, Ji-Sup
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2001.10a
    • /
    • pp.73.1-73
    • /
    • 2001
  • To utilize the uranium resources contained in the spent nuclear fuel generated from the nuclear power plants, the remote handling and dismantling technology is required. The dismantling process of the sport fuel is the most common process involved in the spent fuel recycling, the rod consolidation and the disposal processes. Since the machine used in the dismantling process are located and operated in isolated space, so called a hot cell, the reliability of machines is very important. To enhance the reliability of the process, in this research, the graphical monitoring system is developed for the fuel dismantling process. The graphic model of each machine is composed of many parts and every parts of the graphic model are given their own kinematics. Using the kinematics and simulating the graphic model in the virtual environment, the validity of the conceptual design can be verified before ...

  • PDF

A Lossless Multicast Handoff Method for Wireless ATM Networks (무선 ATM 망을 위한 손실없는 멀티캐스트 핸드오프 기법)

  • 하은용
    • The KIPS Transactions:PartC
    • /
    • v.8C no.1
    • /
    • pp.88-96
    • /
    • 2001
  • Future mobile communication networks, which consist of ATM-based B-ISDN backbone networks and wireless ATM networks, will provide u user with broadband connection and QoS service. These network systems need the lossless handoff methods which support user mobility, satisfy ATM features such as ATM cell ordering and no ATM cell duplication and minimize buffer requirement for ATM cell buffering. In this paper we suggest a multicast-based handoff method to supp$\alpha$t lossless connection as well as to minimize buffer overhead. It establishes a dynamic multicast connection between source terminal and wireless member AP (access point)s. When the mobile terminal receives data packet correctly, it notifies the positive acknowledgement of the packet to all member APs. And member APs then release the MT related temporary buffer space for MT's future movement. Therefore member APs can eliminate unnecessary buffer usage and manage the buffer space efficiently. Analysis result shows that our handoff method has better performance in buffer requirement for lossless and seamless connection services over VCT (virtual connection tree) method and other dynamic multicast-based handoff methods.

  • PDF

Conservative Visibility Preprocessing by Expressing 4-D visibility Information on 2-D Spaces (2차원 평면상에 4차원 가시성 정보의 표현을 통한 포괄적 가시성 전처리)

  • Heo, Jun-Hyeok;Wohn, Kwang-Yun
    • Journal of the Korea Computer Graphics Society
    • /
    • v.5 no.2
    • /
    • pp.9-23
    • /
    • 1999
  • Visibility preprocessing is a useful method to reduce the complexity of scenes to be processed in real-time, and so enhances the overall rendering performance for interactive visualization of virtual environments. In this paper, we propose an efficient visibility preprocessing method. In the proposed method, we assume that navigatable areas in virtual environments are partitioned into rectangular parallelpiped cells or sub-worlds. To preprocess the visibility of each polygon for a given partitioned cell, we should determine at least the area-to-area visibility. This is inherently a four-dimensional problem. We efficiently express four-dimensional visibility information on two-dimensional spaces and keep it within a ternary tree, which is conceptually similar to a BSP(Binary Space Partitioning) tree, by exploiting the characteristics of conservative visibility. The proposed method is able to efficiently handle more general environments like urban scenes, and remove invisible polygons jointly blocked by multiple occluders. The proposed method requires O(nm) time and O(n+m) space. By selecting a suitable value for m, users can select a suitable level of trade-off between the preprocessing time and the quality of the computational result.

  • PDF

Cell-based Participant Management Model in Distributed Virtual Environment (셀분할 모델에 기반한 가상공간 다중참여자 관리기법)

  • 유석종
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2003.10a
    • /
    • pp.527-531
    • /
    • 2003
  • Previous researches on scalability problem of distributed virtual environment (DVE) have been mainly focused on spatial partitioning of area of interest (AOI). Congestion phenomena by avatar groups in AOI have been neglected relatively. However, AOI congestion is highly related to scalability of DVT because it exhausts system resources such as network bandwidth and rendering time, and could be a bar to perform collaboration among participants. In this paper, this will be defined as the problem that must be solved for the realization of the scalable DVE, and a model will be proposed to measure and control congestion situation in AOI. The purposes of the proposed model are to prevent high density of participants in AOI, and to protect stable collaboration in DVE. For evaluation of the performance it is compared with a previous method by defining the resource cost model which is dynamically activated to AOI congestion.

  • PDF