• Title/Summary/Keyword: Variable Module

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Reconfiguration of PV Module Considering the Shadow Influence of Photovoltaic System (태양광 발전시스템의 그림자 영향을 고려한 PV 모듈의 재구성)

  • Ko, Jae-Sub;Chung, Dong-Hwa
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.2
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    • pp.36-44
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    • 2013
  • This paper proposes the reconfiguration of PV module considering shadow influence of photovoltaic system. The PV system is consisted series-parallel connection of PV module. The voltage and current between PV modules become unbalance when shadow occurs to PV module. If shadow occurs to the series connection PV module, the output current is limited to current of shaded PV module. Also if shadow occurs to the parallel connection PV module, the output voltage is limited to voltage of shaded PV module. These problems are caused power loss. Therefore, the PV module in this paper consist using the fixed module and variable module by shaded conditions. The reconfiguration of PV module can compensates the shadow influence by changing connection of a variable module when shadow is occurred to PV module. A validity of the reconfiguration of PV module proposed in this paper proves through comparing with performance of conventional PV module.

Development of An Optimal Design Program for Open-Chain Dynamic Systems (불구속연쇄 동적시스템을 위한 최적설계 프로그램 개발)

  • 최동훈;한창수;이동수;서문석
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.12-23
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    • 1994
  • This paper proposes an optimal design software for the open-chain dynamic systems whose governing equations are expressed as differential equation. In this software, an input module and an automatic creation module of the equation of motion are developed to contrive the user's convenience. To analyze the equation of motion of the dynamic systems, variable-order and variable-stepsize Adams-Bashforth-Moulton predictor-corrector method is used to improve the efficiency. For the optimization and the design sensitivity analysis, ALM(augmented lagrange multiplier)method and adjoint variable method are adopted respectively. An output module with which the user can compare and investigate the analysis and the optimization results through tables and graphs is also provided. The developed software is applied to three typical dynamic response optimization problems, and the results compare very well with those available in the literature, demonstrating its effectiveness.

Study of bidirectional DCDC converter to prevent circulating current between battery packs (배터리 팩 간의 순환전류 방지를 위한 양방향 DCDC 컨버터 연구)

  • Lee, Seunghyun;Joo, Sungjun
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.695-703
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    • 2019
  • In this paper, we propose a method to remove the circulating current which can occur in the parallel connection of the high voltage series connected battery module in the battery pack. The removal way is a method of inserting a module named VVSM (Variable Voltage Variable Module) using bidirectional DCDC converter and supercapacitor in place of one or some of the cascaded battery cells in the battery pack configuration. In this module, it operates like a battery cell that can be controlled at a desired voltage. VVSM is used to match the voltages of the cascaded battery modules very easily. To demonstrate the proposed method, a PSIM simulation for battery model is used. In addition, the module with only the battery cell connected in series and the module with the proposed VVSM are made, and the two modules were connected in parallel to measure the circulating current between the two modules. As a result, it was verified that the proposed method effectively suppressed the circulating current.

Small-Sized Variable Stiffness Actuator Module Based on Adjustable Moment Arm (가변 모멘트 암 기반의 소형 가변 강성 액추에이터 모듈)

  • Yu, Hong-Seon;Song, Jae-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.10
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    • pp.1195-1200
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    • 2013
  • In recent years, variable stiffness actuation has attracted much attention because interaction between a robot and the environment is increasingly required for various robot tasks. Several variable stiffness actuators (VSAs) have been developed; however, they find limited applications owing to their size and weight. For realizing their widespread use, we developed a compact and lightweight mini-VSA. The mini-VSA consists of a control module based on an adjustable moment arm mechanism and a drive module with two motors. By controlling the relative motion of cams in the control module, the position and stiffness can be simultaneously controlled. Experimental results are presented to show its ability to change stiffness.

A Study on the System Principle of PID Module Implementation (PID Module 구현 원리 시스템에 대한 연구)

  • 위성동;김태성;최창주;권병무
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.05a
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    • pp.183-192
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    • 1999
  • The derivative equation measured of a ${\Delta}MV=Kp*{(EVn-EVn-1)+\frac{1}{Ki/S}* EVn+(Kd/S)*(2PVn-1-PVn-PVn-1)}$ is used on the machine apparatus of industrial field, but this par doesn\`t able to educate now, because we didn\`t have the implementation device of PID module, so the principle implementation system of the PID Module is manufactured and developed. Through this system, the implementation system of PID Module is practiced with that the SV and the set of P, I, D is set on the derivative equation measured of PID. A things to be known of this experiment result is flow. 1)PID module is known that had to be used with the module of A/D and D/A. 2) In process of PV is approached to the SV to follow Kp, Ti and Td to cause a constant of set value on the $MVp=Kp*EV, MV=\frac{1}{Ki}{\int}EVdt, MVd=Td\frac{d}{dt}EV$, the variable rate of E and Kp, Td, Ti in that table 1 is analysed, is same as flow. (1)If Kp is high, PV is near fast to the SV, but Kp is small, PV is near slowly to the SV. (2)If Ki is shot, PV is close fast to the SV, but Ti is high, PV is close slowly to the SV (3)If Td is high, the variable rate of E press hardly when because it doesn\`t increase, but Td is small, the variable rate of E press not hardly, upper with 1), 2), PID module is supposed that be able to do the A/S and an implementation of that apparatus, and getting a success of aim that an engineer want, on control of temperature, tension, velocity, amount of flow, power of wind end so on, to get the principle of automatic implementation in industrial field with cooperation of A/D and D/A module.

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The Design of Student Module for Web-Based Instruction System using Fuzzy Theory (웹기반 교육 시스템에서 퍼지이론을 이용한 학습자 모듈의 설계)

  • 백영태;서대우;왕창종
    • Journal of Korea Society of Industrial Information Systems
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    • v.6 no.3
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    • pp.35-43
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    • 2001
  • This thesis proposes a diagnostic formula for student's responses based on linguistic variable concept of fuzzy that makes domain expert to input the kernel elementeasily that constructs domain independent student module. And the domain expert can construct the rule with linguistic variable that is used to inference student's recognition state. This study designs a student module that can inference student's recognition state using this rule represented by linguistic variable.

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Variable apartment building planning by using combinable container house module (가변적 평면이 가능한 컨테이너 모듈형 조립식 공동주택의 건축계획)

  • Cho, Tae-heum;Chin, Kyung-Il
    • KIEAE Journal
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    • v.17 no.4
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    • pp.95-100
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    • 2017
  • Purpose: Now a day, Most of the residential house in Korea consists of apartment buildings. However, in the case of old apartment buildings, dwelling environment condition depends on management effort by residents. But we can't rebuild or restructure only old single dwelling unit in apartment buildings. And we can't move every single dwelling unit in the apartment building. Therefore, this study suggests a prototype of combinable container dwelling module apartment. Method: The method of research is exploring the case of previously constructed containers. Based on the case, This study suggests prototypes to create a variable apartment design with dwelling container units. Based on the prototype, various combinations are proposed to produce various types of dwelling space. Finally, this study makes an example plan for the apartment by using the container unit modules. Results: This study suggests combinable container apartment building prototypes. And it may be a fundamental study of changing the apartment building concept.

Development of the Wire EDM CAM System Considering a Variab1e Taper Wire-cut and an Unmanned Wire EDM During the Night (상하이형상 및 야간 무인가공을 고려한 와이어 EDM 전용 CAM 시스템 개발)

  • 유우식;정회민
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.3
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    • pp.206-214
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    • 2001
  • This paper describes the wire EDM (Electric Discharge Machining) CAM system considering a variable taper wire-cut and an unmanned wire EDM during the night. Wire EDM is applicable to all materials that are fairly good electrical conductors, including metals, alloys and most carbide. Thus it provides a relatively simple method for making holes of any desired cross section in materials that are too hard or brittle to be machined by most other methods. In this paper we classify variable taper wire-cut machining patterns and variable taper wire-cut geometries. Also we determine unmanned wire EDM patterns fur the productivity of wire EDM industry. Developed system consists of two modules: 1) Variable taper wire EDM module guarantees the length ratio machining function, the parametric ratio machining function and the marking function. 2) Unmanned wire EDM module guarantees the automatic wire EDM during the night. The proposed system has been tested in the fields and found to be a useful system.

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Study on the 3D Assembly Inspection of Two-Step Variable Valve Lift Modules Using Laser-Vision Technology (레이저 비전을 이용한 2단 가변밸브 리프트 모듈의 3D 조립검사에 대한 연구)

  • Nguyen, Huu-Cuong;Kim, Do-Joong;Lee, Byung-Ryong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.10
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    • pp.949-957
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    • 2017
  • A laser-vision-based height measurement system is developed and implemented for the inspection of two-step variable valve lift module assemblies. The proposed laser-vision sensor module is designed based on the principle of laser triangulation. This paper summarizes the work on 3D point cloud data collection and height difference measurements. The configuration of the measurement system and the proposed height measurement algorithm are described and analyzed in detail. Additional measurement experiments on the height differences of valves and lash adjusters of a two-step variable valve lift module were implemented repeatedly to evaluate the accuracy and repeatability of the proposed measurement system. Experimental results show that the proposed laser-vision-based height measurement system achieves high accuracy, repeatability, and stabilization for the inspection of two-step variable valve lift module assemblies.

Construction of Combinational MVL Function Based on T-Gate Integrated Module (T-게이트 통합 모듈에 의한 조합 MVL 함수의 구성)

  • 박동영;최재석;김흥수
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.11
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    • pp.1839-1849
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    • 1989
  • An optimal variable assignment algorithm is presented as a decomposition method of MVL functions. A given 3-valued combinational logic function is disintegrated into subfunction composed of the function dependant relation, then extracted implicant output elements from subfunctions are assigned to a T-gates. As a circuit implementation tool, a programmable integarated T-gate module is proposed, and the construction procedure of combinational MVL functions is systematized in each step. This method is expected to give properties of the systematic procedure, possibility of T-gate number reduction, unification of module, and flexibility of module composition. Specially variable decomposition method can be pointed out as an approach to solving the limitation problem of the input and output terminal number in VLSI implementations.

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