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다목적실용위성 1호 Maneuver Mode에서의 지상관제 DATA 분석

  • Suk, Byong-Suk
    • Aerospace Engineering and Technology
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    • v.1 no.1
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    • pp.65-71
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    • 2002
  • KOMPSAT-1 AOCS mode divided into three major mode like Sun, Maneuver, Science Mode. The Maneuver mode consist of attitude hold and Δ-V Burn submode. This paper focus on the analysis of AOCS Maneuver Mode characteristics based on on-orbit playback data. The nadir pointing performance of attitude hold submode and the process for Δ-V Burn firing with plus/ minus 90 degree pitch/ roll maneuvering was verified. And also verified that the on-orbit performance meets the AOCS subsystem specification as designed.

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An analysis of the lateral first-order mode characteristics for the semiconductor laser diodes (반도체 레이저 다이오드의 횡방향 1차모드의 특성 해석)

  • 김형래;곽계달
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.12
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    • pp.91-100
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    • 1995
  • This paper represents the lateral first-order mode characteristics for the semiconductor laser diodes using a two-dimensional numerical simulator. In order to analyze the lateral first-order mode characteristics, Helmholtz wave equation is solved twice for the lateral fundamental and the first-order mode considering the mode gain, total losses, and the recombination rate due to the stimulated emission radiation for the each mode independantly. Through this procedure, we find that the lateral first-order mode was easily guided as increasing the stripe width for the index-guiding structures, and that the lateral first-order mode seems to be dominated in the distribution of total light intensity when its output power reaches nearly half of that of the lateral fundamental mode. This results may be used to design the device structure which guides only the lateral fundamental mode.

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Analysis of dual-mode hybrid by using mode change parameter (모드 전환 상수를 이용한 듀얼 모드 하이브리드 해석 방법)

  • Kim, Nam-Wook;Yang, Ho-Rim;Ahn, Kuk-Hyun;Cho, Sung-Tae;Park, Yoeng-Il;Lee, Jang-Moo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.539-542
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    • 2006
  • Many researches about next generation vehicles are trending toward HEV which has better fuel economy than an internal-combustion engine. But existing HEV has some defects at specific running states(eg. highway running It is possible that dual-mode hybrid system overcomes that defects. Mode change parameter, ${\gamma}$ helps to analyse the mode changing of dual mode hybrid and is applied at a numerical analysis on testing the performance. There is an additional constraint when vehicles drive on engine mode. No power assistance of battery applies on engine mode. Because vehicles must be sustained by only engine power while vehicle drives on constant speed mode. At the conclusion of this paper, graphs show the ability of motors that satisfy the equilibrium of the lever system. Designers can roughly determine capacities of the motors, parameters of the lever system by this analysing method.

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Hysteresis and Mode Transition in Electrodeless Lamp (무전극램프 에서의 Hysteresis와 모드 변환 특성)

  • Lee, Joo-Ho;Yang, Jong-Kyung;Lee, Jong-Chan;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • pp.1560-1561
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    • 2007
  • Electrodeless fluorescent lamp exhibit two modes of operation : a low density mode in which the power is capacitively coupled to the plasma and which is known as the E-mode, and a higher density mode which is an inductive discharge known as the H-mode. The transition between these two(E to H) mode exhibits hysteresis. It is observed that transition currents change at different frequencies and hysteresis exists not only between the starting and minimum maintaining currents of the electromagnetic mode (H mode) discharge but also between the starting and minimum maintaining currents of the electrostatic mode (E mode) discharge. Hysteresis effect can be important role in dimming system.

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Investigation on Forced Vibration Behavior of Composite Main Wing Structure Excited by Engine and Propeller (엔진 및 프로펠러 가진에 의한 위그선 복합재 날개 진동 해석)

  • Kong, Chang-Duk;Yoon, Jae-Huy;Park, Hyun-Bum
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.217-221
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    • 2007
  • In this study, forced vibrations analysis was performed for main wing of small scale WIG vehicle which is equipped two-stroke pusher type propeller engine, in terms of structural. for the frequency response analysis, excitations were assumed by H-mode(Horizontal mode), X-mode(Twisted mode) which is main vibration mode of engine, and for the transient response analysis, excitations were assumed by L-mode(Longitudinal mode) with propeller thrust which is occurred when it revolution.

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Current Sliding Mode Control with a Load Sliding Mode Observer for Permanent Magnet Synchronous Machines

  • Jin, Ningzhi;Wang, Xudong;Wu, Xiaogang
    • Journal of Power Electronics
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    • v.14 no.1
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    • pp.105-114
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    • 2014
  • The sliding mode control (SMC) strategy is applied to a permanent magnet synchronous machine vector control system in this study to improve system robustness amid parameter changes and disturbances. In view of the intrinsic chattering of SMC, a current sliding mode control method with a load sliding mode observer is proposed. In this method, a current sliding mode control law based on variable exponent reaching law is deduced to overcome the disadvantage of the regular exponent reaching law being incapable of approaching the origin. A load torque-sliding mode observer with an adaptive switching gain is introduced to observe load disturbance and increase the minimum switching gain with the increase in the range of load disturbance, which intensifies system chattering. The load disturbance observed value is then applied to the output side of the current sliding mode controller as feed-forward compensation. Simulation and experimental results show that the designed method enhances system robustness amid load disturbance and effectively alleviates system chattering.

Crack Growth Behavior by Fatigue Load under Mixed Mode(I+II) (혼합모드(I+II)에서 피로 하중에 의한 균열진전 거동)

  • Gong, B.C.;Choi, S.D.
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.21 no.2
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    • pp.276-282
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    • 2012
  • This study looked for Mode status of each for fatigue crack growth behavior about the repeat load of mode I and the static load of mode II. The experiment was performed in the state of the repetition frequency of the sine wave 10Hz, the stress ratio 0.1, maximum load 300kg.f, a static load 0, 100, 200, 300kg.f, As the experimental results, in mode of static load, while the load value increases, the crack growth rate is slower as the energy of a crack mixing grows. Mode I and the power mode II get an influence each other in the direction of crack propagation path, but as they eventually get closer to the breaking point of the crack growth, it is dominated by the mode I.

How Does the Presentation Mode of Product Information Affect Product Evaluation? : The Mediation of Construal Level and the Moderation of Response Time

  • Cho, Hyun Young
    • International Journal of Contents
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    • v.16 no.1
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    • pp.44-56
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    • 2020
  • The purpose of this study was to examine how the presentation mode (sequential- vs. simultaneous-mode) of information influences its evaluation. Three experiments revealed the interaction effect between the presentation mode and the valence of the product information. When respondents read about the positive aspects of the product, the evaluation was higher in the simultaneous presentation mode than in the sequential presentation mode. For negative product information, respondents' evaluation was higher in the sequential presentation mode than in the simultaneous presentation mode. The simultaneous presentation mode intensified the impact of the information valence on evaluation. This study proposed that the sequential and the simultaneous presentation modes prime high and low construal levels, respectively. The mediation analysis provides support for such a prediction. Finally, the mediating effect of construal levels in evaluation was shown to disappear when respondents focused on the product information for a longer duration, while the mediation effect remained when the response time was short.

A High-Efficiency, Robust Temperature/voltage Variation, Triple-mode DC-DC Converter (고효율, Temperature/voltage 변화에 둔감한 Triple-mode CMOS DC-DC Converter)

  • Lim, Ji-Hoon;Ha, Jong-Chan;Kim, Sang-Kook;Wee, Jae-Kyung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.6
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    • pp.1-9
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    • 2008
  • This paper suggests the triple-mode CMOS DC-DC converter that has temperature/voltage variation compensation techniques. The proposed triple-mode CMOS DC-DC converter is used to generate constant or variable voltages of 0.6-2.2V within battery source range of 3.3-5.5V. Also, it supports triple modes, which include Pulse Width Modulator (PWM) mode, Pulse Frequency Modulator (PFM) mode and Low Drop-Out (LDO) mode. Moreover, it uses 1MHz low-power CMOS ring oscillator that will compensate malfunction of chip in temperature/voltage variation condition. The proposed triple-mode CMOS DC-DC converter, which generates output voltages of 0.6-2.2V with an input voltage sources of 3.3-5.5V, exhibits the maximum output ripple voltage of below 10mV at PWM mode, 15mV at PFM mode and 4mV at LDO mode. And the proposed converter has maximum efficiency of 93% at PWM mode. Even at $-25{\sim}80^{\circ}C$ temperature variations, it has kept the output voltage level within 0.8% at PWM/PFM/LDO modes. For the verification of proposed triple-mode CMOS DC-DC converter, the simulations are carried out with $0.35{\mu}m$ CMOS technology and chip test is carried out.

A New Criterion of Cell Discard in an ATM Switch with Input and Output Buffers (입출력버퍼형 ATM 교환기의 셀 폐기 방법에 대한 새로운 기준 제안 및 성능 분석)

  • Gwon, Se-Dong;Park, Hyeon-Min;Choe, Byeong-Seok;Park, Jae-Hyeon
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.4
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    • pp.1246-1264
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    • 2000
  • An input-output buffering switch operates in either of tow different cell loss modes; Backpressure mode and Queueloss mode. In the previous studies, the Backpressrue mode is more effective at low traffic loads, and the Queueloss mode performs better at high traffic. We propose a new operation mode, called Hybrid mode, which adopts the advantages of he Backpressure and the Queueloss mode. Backpressure and Queueloss modes are distinguished from whether a cell loss occurs at the output buffer or not when output buffer overflows, irrespective of input buffer status. In order to simply combine Backpressure and Queueloss mode, the change of input traffic load must be measured. However, in the Hybrid mode, simply both of the input and output buffer overflow and checked out to determine the cell discard. The performance of the Hybrid mode is compared with those of the Backpressure and the Queueloss mode under random and bursty traffic. This paper show that the Hybrid mode always gives the best performance results for most ranges of load values.

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