• Title/Summary/Keyword: 피크파워

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Peak Power Control for Improvement of Stability in Multi-core System (멀티코어 시스템의 안정성 향상을 위한 피크파워 제어 알고리즘)

  • Park, Sung-Hwan;Kim, Jae-Hwan;Ahn, Byung-Gyu;Jung, Il-Jong;Lee, Seok-Hee;Chong, Jong-Wha
    • Proceedings of the IEEK Conference
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    • pp.747-748
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    • 2008
  • In this paper, we propose a new algorithm for task scheduling consisting of subtask partitioning and subtask priority scheduling steps in order to keep the peak power under the system specification. The subtask partitioning stepis performed to minimize the idle operation time for processors by dividing a task into multiple subtasks using the least square method developed with power consumption pattern of tasks. In the subtask priority scheduling step, a priority is assigned to a subtask based on the power requirement and the power variation of subtask so that the peak power violation can be minimized and the task can be completed within the execution time deadline.

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The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [ I ] - The Effect of Processing Parameter on Weldability of Laser - (펄스 Nd:YAG 레이저를 이용한 모터용 스테이터 적층코어의 용접특성 [ I ] - 레이저 용접성에 미치는 가공변수의 영향 -)

  • Kim Jong-Do;Yoo Seung-Jo;Kim Jang-Soo
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.5
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    • pp.629-635
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    • 2006
  • Manufacture of motor by laser has been studying realization that was demands on market for lightening and miniaturization. Moreover. early in the 1980s. manufacture of parts for automobiles by laser welding was already successfully introduced. The purpose of this study was to develop production technology of the high quality laminated stator core for motor by pulsed Nd:YAG laser heat source. In the event of adjusting defocus and voltage to control humping in laser welding of the laminated core. sound bead could be obtained. but deep penetration was not. Therefore. explosive evaporating plasma was controlled by adjustment of peak power on pulse width. Particularly, because explosive evaporating plasma induced high peak power, made molten metal in keyhole scatter. a suitable adjustment of peak power was required to obtain sound bead. As a results of experiment. sound bead and deep penetration could be obtained.

Effect of Nurida-Ball exercise on muscle function, spinal alignment, and dynamic balance capacity in Middle-Aged Men (누리다 볼 운동이 중년 남성의 근기능, 척추정렬 및 동적 균형능력에 미치는 영향)

  • Choi, Dong-Hun;Kim, Tae-Kyung;Park, Jae-Myoung;Jung, Jong-Hwan;Yeom, Dong-Chul;Cho, In-Ho;Cho, Joon-Yong;Koo, Jung-Hoon
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.6
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    • pp.1556-1566
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    • 2020
  • The purpose of this study was to investigate the effect of Nurida-Ball exercise on isokinetic muscle function, spinal alignment, and dynamic balance capacity in middle-aged men. All middle-aged men(n=16) were divided into 2 groups: Ball exercise(BE, n=8) and control(CON, n=8) group. BE group performed the Nurida-Ball exercise(30 min/day, 3 days/week, 8 weeks) and isokinetic knee and trunk muscle function, spinal alignment, and dynamic balance capacity were measured. All of the measured variables calculated the mean and standard deviation and verified normality using the Shapiro-Wilk test. The independent t-test method and the Paired t-test method were then analyzed to identify differences between groups. This study found that isokinetic knee and trunk muscle function was significantly strengthened in the BE compared with CON group by increasing peak torque(PT) of right and left knee extension(60°/sec, p<0.01, respectively), average power(AP) of right and left knee extension(60°/sec, p<0.05, p<0.01, respectively), and PT of right knee flexion(180°/sec, p<0.05) and AP of right knee extension(180°/sec, p<0.05). In the change of isokinetic trunk muscle function, only PT of trunk extension(180°/sec) was increased in the BE compared with the CON group(p<0.05). In addition, Nurida-ball exercise can improve the spinal alignment by reducing the trunk inclination(p<0.05) in the BE compared with the CON group. Finally, dynamic balance capacity was also enhanced in the BE compared with the CON group by decreasing the score of overall balance index(OBI, p<0.01) and Antero-posterior balance index(p<0.05) in the Stage-6, and OBI(p<0.05) in the Stage-1. This result demonstrated that Nurida-ball exercise may improve spinal alignment, dynamic balance capacity, and isokinetic muscle function, which might be an effective way for the improvement of health-related fitness in middle-aged men.

Characteristics of 32 × 32 Photonic Quantum Ring Laser Array for Convergence Display Technology (디스플레이 융합 기술 개발을 위한 32 × 32 광양자테 레이저 어레이의 특성)

  • Lee, Jongpil;Kim, Moojin
    • Journal of the Korea Convergence Society
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    • v.8 no.5
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    • pp.161-167
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    • 2017
  • We have fabricated and characterized $32{\times}32$ photonic quantum ring (PQR) laser arrays uniformly operable with $0.98{\mu}A$ per ring at room temperature. The typical threshold current, threshold current density, and threshold voltage are 20 mA, $0.068A/cm^2$, and 1.38 V. The top surface emitting PQR array contains GaAs multiquantum well active regions and exhibits uniform characteristics for a chip of $1.65{\times}1.65mm^2$. The peak power wavelength is $858.8{\pm}0.35nm$, the relative intensity is $0.3{\pm}0.2$, and the linewidth is $0.2{\pm}0.07nm$. We also report the wavelength division multiplexing system experiment using angle-dependent blue shift characteristics of this laser array. This photonic quantum ring laser has angle-dependent multiple-wavelength radial emission characteristics over about 10 nm tuning range generated from array devices. The array exhibits a free space detection as far as 6 m with a function of the distance.

The Q-switched $1.3\mum$ Nd:YAG laser using sautrable absorber Nd:LSB (포화흡수체 Nd:LSB를 이용한 $1.3\mum$ Q-스위칭 Nd:YAG 레이저)

  • 지명훈;이재명;오세용;이영우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.329-332
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    • 2001
  • In this paper, it's shown that the saturable absorber Nd:LSB has a capability as a saturable absorber in Q-switching system. In the passively Q-switched 1.3${\mu}{\textrm}{m}$ Nd:YAG laser with saturable absorber, we theoretically investigated the optimized output mirror, peak power, output power, pulse width and output efficiency. The passively Q-switched Nd:YAG laser with saturable absorber Nd:LSB gives peak power of 30MW and pulse width of 6.23 ps at 30cm resonator length and output mirror reflectivity 98%. Consequently the output energies are 143, 200 and 209 $\mu$J at loss of 2.2%, 2.1% and 1.5%, respectively.

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Output Characteristics of a Diode-Pumped, Actively Q-Switched, Mode-Locked 1064 nm Nd:YAG Laser and an Extracavity Frequency Doubled 532 nm Laser with a Lithium Triborate (다이오드로 펌핑하는 능동형 Q-스위칭 및 모드-동기된 1064 nm Nd:YAG 레이저와 LBO를 이용한 외부공진기 주파수 배가에 의한 532 nm 레이저의 출력특성)

  • Rhyee, Kun Hee;Choo, Han Tae;Park, Cha Gon;Lee, Hyung Man
    • New Physics: Sae Mulli
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    • v.67 no.4
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    • pp.491-498
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    • 2017
  • The output characteristics of a diode-pumped actively Q-switched and mode-locked (QML) 1064 nm Nd:YAG laser with a Z-type cavity and of an extracavity frequency-doubled 532 nm QML laser with a Lithium Triborate (LBO) were invesgated. At a Q-switching repetition rate of 2 kHz and an incident pump power of 10.5 W, the maximum output powers of a Q-switched laser and a QML laser, both at 1064 nm were 1.21 W and 1.0 W corresponding to optical conversion efficiencies of 11.5% and 9.5%, respectively. Also, the pulse widths of the Q-switched envelope and the mode-locked pulse inside the Q-switched envelope at 78 MHz were 215 ns and 990 ps, respectively. The maximum peak power of the only Q-switched and QML laser was 2.8 kW and 10 kW, respectively. In the case of two, the maximum conversion efficiencies of second harmonic generation (SHG) with a LBO were 14% and 35.5% corresponding to maximum output powers of 170 mW and 330 mW, respectively. The $M^2$ of a 532 nm QML laser about the x-axis and the y-axis at 532 nm were 2.25 and 2.58, respectively.