• Title/Summary/Keyword: Space Power

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A Study on Interweaving phenomena in contemporary space design with post-structualism (후기 구조주의 관점에서 본 현대 공간디자인에 나타나는 인터위빙(interweaving)현상에 관한 연구)

  • Jung Jae-Won;Kim Moon-Duck
    • Korean Institute of Interior Design Journal
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    • v.15 no.4 s.57
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    • pp.156-164
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    • 2006
  • One of frequent phenomena in the contemporary cultural field is the alternative or accompanying interweaving phenomena which happens in the relative connection of A, B, and C. The power of interweaving mixture is one of energies which unify the contemporary cultural phenomena, and it appears as a major phenomena in the recent popular digital architecture. In this study, the mixture, shape, and contents in the contemporary space design is analyzed as a point of view of Post-Structuralism. Namely, the digital part and non-digital part of alternative and circulating existence in the space are classified and the interweaving phenomena in the contemporary space design are proved. It is studied for digital part and physical space to conjunct the hole space and smooth space of Deleuze as part of interweaving phenomena. It is clear that the compatible concept of the hole space and smooth space is crossed complexly or is coexisting in circulating and extending, and is showed as interweaving phenomena in one space.

Cathode Power Development of Hall Thruster for Small Satellite using Microwave cathode (마이크로웨이브 음극을 이용한 소형 인공위성의 홀 추력기용 음극전원 개발)

  • Kang, Seokhyun;Choo, Wongyo;Choi, Junku;Jeong, Yunhwang;Kim, Younho;Kang, Seongmin;Kuninaka, Hitoshi;Cha, Hanju
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.11
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    • pp.974-980
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    • 2014
  • A power supply of cathode has been developed for hall-effect thruster for small satellite. A microwave cathode has been applied to the electric propulsion system and cathode power is necessary in oder to work securely. Anode current is varied by a flow rate controlled by anode tank pressure. Then cathode current has to be controled in proportion by anode current. So cathode power supply has been designed to offer a current proportional to anode current. Also cathode power has been tuned to work securely for cathode to emit more electron than anode within 0.03A. The function test of cathode power was performed by constructing an equivalent load for anode and cathode. It has been tested in a vacuum chamber in order to ensure a stable operation of the thruster. And it was confirmed that thruster normally has been operated in the space environment after the launch.

Comparative Study of DC Breakdown and Space Charge Characteristics of Insulation Paper Impregnated with Natural Ester and Mineral Oil

  • Hao, Jian;Zou, Run-Hao;Liao, Rui-Jin;Yang, Li-Jun;Liao, Qiang;Zhu, Meng-Zhao
    • Journal of Electrical Engineering and Technology
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    • v.13 no.4
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    • pp.1682-1691
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    • 2018
  • Natural ester is a suitable substitute for mineral oil and has been widely used in AC transformer in many countries. In order to further application of natural ester in direct current (DC) equipment, it is needed to investigate its long term insulation property under DC condition. In this paper, a thermal ageing experiment was conducted for both mineral oil-paper and natural ester-paper insulation. The DC breakdown and space charge characteristics of insulation paper impregnated with natural ester and mineral oil was compared. Results show that the resistivity of the paper immersed in natural ester and mineral oil both increase as the ageing goes on. While insulation paper impregnated with natural ester has higher resistivity and DC breakdown voltage than the paper impregnated with mineral oil. The DC breakdown voltage for the oil impregnated insulation paper being DC pre-stressing is higher than that without pre-stressing. The average DC breakdown field strength difference between the test with pre-stressing and without pre-stressing clearly shows that there is an apparent enhancement effect for the homo-charge injection on the DC breakdown.

Adaptation of Space Vector Modulation to Single-Phase High Power PWM Converters (단상 PWM 컨버터에 적용한 공간 벡터 PWM)

  • Lee, Hee-Myun;Lee, Dong-Myung
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.442-443
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    • 2011
  • In this paper, a voltage control method based on DQ transformation and Space Vector Pulse Width Modulation (SVPWM) for a single phase three-level converter is proposed. This control method is designed to use DC values instead of using instantaneous values of current which are usually used in single-phase application, so that it results in a fast and robust voltage control response. Simulation results demonstrate the validity of the control strategies.

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A correlation study of substorm injections and ULF power with relativistic electron events

  • Jeong-A Hwang;Gyeong-Uk Min;Ji-Na Lee;Dae-Yeong Lee
    • Bulletin of the Korean Space Science Society
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    • 2004.04a
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    • pp.88-88
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    • 2004
  • We demonstrate that the flux levels of post-storm relativistic electrons are well correlated with the amount of electrons of the energy about 100 keV injected during substorms, while the power of ULF is more or less related to the spectral hardening of these seed electrons. Hence, the existence of ULF alone during the storm time does not necessarily cause flux increase of relativistic electrons as storms do not always generate sufficient amount of seed electrons of this energy range. (omitted)

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The Development of Control Algorithms of D-STATCON for Compensations of AC Voltage and DC Link Voltage and Harmonics Improve the Qeality of Electric Power (전력 품질 향상을 위한 배전용 STATCON의 AC전압, 직류결합 전압 및 고조파 보상 제어알고리즘 개발)

  • 오관일;전영수;이기선;추진부
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.333-337
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    • 1999
  • This paper presents the DQ transfomation space space vector modulation method to devel control algorithm of distribu STATCON(STATic CONdenser) for line volt regulation, dc link voltage regulation harmonics compensation. The Performance an of a PI with ramp comparision and synchro reference frame current controller is carried Based on these analysis, the control perform are desirable to compensate the harmonics a regulate dc link and line voltage of Distrib line.

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APPROXIMATE PROJECTION ALGORITHMS FOR SOLVING EQUILIBRIUM AND MULTIVALUED VARIATIONAL INEQUALITY PROBLEMS IN HILBERT SPACE

  • Khoa, Nguyen Minh;Thang, Tran Van
    • Bulletin of the Korean Mathematical Society
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    • v.59 no.4
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    • pp.1019-1044
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    • 2022
  • In this paper, we propose new algorithms for solving equilibrium and multivalued variational inequality problems in a real Hilbert space. The first algorithm for equilibrium problems uses only one approximate projection at each iteration to generate an iteration sequence converging strongly to a solution of the problem underlining the bifunction is pseudomonotone. On the basis of the proposed algorithm for the equilibrium problems, we introduce a new algorithm for solving multivalued variational inequality problems. Some fundamental experiments are given to illustrate our algorithms as well as to compare them with other algorithms.

A plan to harmonize the equipments of power distribution with its environment (배전설비의 환경조화방안)

  • Lee, Jae-Gwan;Kim, Sang-Yul
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1206-1209
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    • 1998
  • For 21th Century, the assignment of power distribution will be the expansion of equipments to supply electric power and harmony with its environment, in process of approving value consciousness of land, space, and the preservation of surroundings. This paper proposes a plan to match with the requirement about equipments, having ability to supply electric power, being harmonized itself with its surroundings by applying a general concept of "Amenity" when we choose an established form of power distribution.

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A NEW METHOD FOR NORTH-SOUTH ASYMMETRY OF SUN SPOT AREA ANALYSIS

  • Chang, Heon-Young
    • Journal of Astronomy and Space Sciences
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    • v.24 no.4
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    • pp.261-268
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    • 2007
  • We have studied the temporal variation in the North-South asymmetry of the sunspot area during the period from 1874 to 2007. Though the 9-year periodicity is commonly reported, shorter periodicities is still under study. We employ the cepstrum analysis method to analyze the noisy power spectrum of the North-South asymmetry. We demonstrate that the cleaned power spectrum shows reduction of the spurious back-ground noise level. Some of short period peaks in the power spectrum disappear after deconvolution. It should be, however, pointed out that power spectrum might look less noisy because of a filtering process during deconvolution. We conclude by pointing out that a more sophisticate filtering algorithm is required to produce a precise and reliable periodicity estimate.

Matlab/Simulink based Realtime Simulation of Induction Motor Drives (Matlab/Simulink기반 유도전동기 벡터제어 시스템의 실시간 시뮬레이션)

  • Lee HakJu;Kwon SeongChul;Yang SeungKwon;Oh SungUp;Seong SeJin
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.19-22
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    • 2004
  • In this paper, we present a way that can implement the vector control Algorithm of induction motor and PWM signal generation on the basis of Matlab Simulink environment. The overall system model is designed by Simulink toolbox for vector control of induction motor, and then implement experiment with the DS1103 board of dSPACE. Although we are not coding the system, it is capable of doing simulation and experiment simultaneously. That is why Matlab and dSPACE board compiler can generate the '*.c' and '*.obj' files on the designed system automatically. After considering about hardware structure and driving system in Ds1103 board we verify the availability of Proposed method through in a comparison/analysis between simulation and experiment.

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