• 제목/요약/키워드: Pulse mode

검색결과 755건 처리시간 0.021초

방사모드에 따른 레이저 치료 효과 (A Effect of Photo Dynamic Therapy for LAZER Wave Mode)

  • 최덕수;임현수;이병구;네클라 커나르
    • 대한의용생체공학회:의공학회지
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    • 제37권4호
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    • pp.134-139
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    • 2016
  • US Food and Drug Administration (FDA) approved as a innovative cure for cancer, 1996. The effect is death of cancer cells through necrosis, apoptosis. Mainly the Continuous Wave mode (CW) use for PDT Laser. It sting, the question including itch, and etc. Reportedly, the increase of temperature with the perforated edema, ulcer, necrosis. The Thermal relaxation time and Oxygen recovery time is necessary. To give a normal oxygen recovery time of the cell, used Pulse mode. Progress, it was Burst Pulse mode when easing the thermal wake, the simplicity was secured, the PDT effect is good. Excepted in control group CW, Pulse, Burst pulse mode were incubated with various concentrations of 5-aminolevulinic acid hydrochloride (ALA-5). The tumor size reduction CW mode (44%), Pulse mode (48%), Burst pulse mode (53%) at 4 week after PDT with 0.3, 0.3, 0.3 mg/ml of ALA-5. After 4 hours, investigation of 100, 100, $100J/cm^2$ laser irradiation. The pulse mode was superior in expirimental data analysis. And it was the Burst pulse mode edge head of a family effect.

모드 전환형 펄스충전기론 이용한 폐납축전지 재활용에 관한 연구 (An Study for reuse of the waste lead battery using Pulse Charger with mode conversion type)

  • 신춘식;안영주;김상동;신영미;김종달;김동완
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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    • pp.101-107
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    • 2007
  • In this paper, the pulse charger with mode consersion type is proposed that can reuse the waste lead battery. The pulse charger uses the switch mode of the forward convert method. The pulse charger maintain the constant voltage in state removing the lead battery and when it connected the pulse charger, it is converted the charge mode of the constant current immediately. It continues the rapid charge until the full state of the lead battery. After that the pulse charger is converted to the charge mode of constant voltage automatically, and then it continues the normal charge. The experiment results show that the effectiveness of pulse charger such as the good performance and the prolonged durability in lead battery according to capacity states.

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Effect of Power Mode of Plasma Anodization on the Properties of formed Oxide Films on AZ91D Magnesium Alloy

  • Lee, Sung-Hyung;Yashiro, Hitoshi;Kure-Chu, Song-Zhu
    • 한국재료학회지
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    • 제28권10호
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    • pp.544-550
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    • 2018
  • The passivation of AZ91D Mg alloys by plasma anodization requires deliberate choice of process parameters due to the presence of large amounts of structural defects. We study the dependence of pore formation, surface roughness and corrosion resistance on voltage by comparing the direct current (DC) mode and the pulse wave (pulse) mode in which anodization is performed. In the DC plasma anodization mode, the thickness of the electrolytic oxide film of the AZ91D alloy is uneven. In the pulse mode, the thickness is relatively uniform and the formed thin film has a three-layer structure. The pulse mode creates less roughness, uniform thickness and improved corrosion resistance. Thus, the change of power mode from DC to pulse at 150 V decreases the surface roughness (Ra) from $0.9{\mu}m$ to $0.1{\mu}m$ and increases the corrosion resistance in rating number (RN) from 5 to 9.5. Our study shows that an optimal oxide film can be obtained with a pulse voltage of 150 V, which produces an excellent coating on the AZ91D casting alloy.

SRM의 DC linke 전압리플을 고려한 단일 펄스 구동 방식의 특성 해석 (The Characteristic Analysis of SRM Dirven by Single-pulse Mode Considering the Voltage Ripple of DC Linke)

  • 이성구;정대성;이주
    • 전기학회논문지
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    • 제57권11호
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    • pp.1976-1980
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    • 2008
  • This paper deals the characteristic analysis of Switched Reluctance Motor(SRM) driven by single-pulse mode considering dc link voltage ripple. Two dimensional time-stepped Finite Element Method(FEM) is used to analyze the characteristic of SRM driven by single-pulse mode with dc link voltage ripple. The analysis results is verified by experimental test.

플라이백 컨버터방법에 의한 태양광발전설비의 납축전지 스위칭모드 전환형 펄스충전기 개발 (Development of the Switching Mode Conversion Type Pulse Charger for the Lead Battery of Solar Cell Generator Equipment by Fly-Back Converter Method)

  • 신춘식;안영주;김동완
    • 전기학회논문지P
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    • 제58권1호
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    • pp.20-26
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    • 2009
  • In this paper, the switching mode conversion type pulse charger by fly-back converter method for lead battery of the solar cell generator equipment is proposed. And we propose the control circuit and design method of insulated switching mode convert type pulse charger by fly-back convert method in the lead battery. The proposed system can minimize the current consumption by digital pulse. Also the proposed system can generate the constant 10[KHz] frequency, transmit the signal with main control system in the power control system. And it supervises the state of lead battery using one chip micro processor. The proposed the switching mode conversion type pulse charger by the fly-back converter method can charge fast and stabilize lead battery with nominal value 12[V], 20[AH]. Also we propose the design procedure of the power control circuit for turn ratio of fly-back inductor and determining method of values such as the charging current, bulk current, partial current, over current value and fixed charging voltage. The experiment results for the voltage and current wave for partial, bulk, over and fixed charging period show the good charging effect and performance. And the PCB and internal coupling diagram of the switching mode conversion type pulse charger by fly-back converter method is presented.

광섬유와 회절격자쌍을 이용한 Additive-Pulse Mode-Locking된 CW Nd:YLF 레이저의 광펄스 압축 (Pulse Compression of an Additive-Pulse Mode-Locked CW Nd:YLF Laser by Using an Optical Fiber and a Grating Pair)

  • 안승준
    • 한국광학회지
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    • 제4권1호
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    • pp.66-72
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    • 1993
  • 파장이 $1.053{\mu}m$에서 연속 발진하는 Nd:YLF 레이저에, 비선형 매질로서 단일모드 광섬유를 이용한 외부 공진기를 연결하여 additive-pulse mode-locking(APM)된 펄스를 얻었다. APM 펄스의 펄스폭은 4.5 ps이며 평균 출력은 1.5W이다. APM 펄스를 광섬유와 회절격자쌍을 이용하여 peak power가 17 kW인 210 fs의 극초단 펄스로 압축하였다.

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글라스 레이저 발진기의 출력펄스특성의 개선에 관한 연구 (Improvement of pulse characteristics of glass laser oscillator)

  • 강형부
    • 전기의세계
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    • 제29권5호
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    • pp.321-328
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    • 1980
  • The Q-switching oscillator of TE $M_{00}$ mode was constructed in order to improve the properties of energy focusing and amplification, and prevent laser materials from breakdown. The Q-switching was done by means of electro-optical effect using Glan prism and KDP Pockels cell. Sharp laser pulse of risetime-1 ns and variable pulse width 2-10 ns was obtained from Q-switching laser pulse by PTM method using a laser triggered spark gap (LTSG), Glan prism and Pockels cell. A single ultra-short pulse (picosec order in pulse width) was obtained from mode-locked pulse train in combination of a mode-locked oscillator using saturable dye cell with pulse shaping system using PTM method.d.

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치은연하치석제거술시 Nd : YAG 레이저를 이용한 효과에 관한 주사전자현미경적 연구 (The Scanning Electron Microscopic study on the effect during subgingival calculus removal using Nd:YAG laser)

  • 전용선;최병선;이석초;김형섭
    • Journal of Periodontal and Implant Science
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    • 제27권2호
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    • pp.411-424
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    • 1997
  • The purpose of this study was to evaluate in vitro the effects during subgingival calculus removal using Nd:YAG laser. The study group was consisted of 30 teeth with advanced periodontal disease extracted before the start of periodontal therapy. The specimens were divided into 8 different groups : 1) untreated control 2) scaling and root planing only 3) laser treated using 150mJ/pulse, 1sec, 5sec, contact mode 4) laser treated using 200mJ/pulse, 5sec, contact mode 5) laser treated using 150mJ/pulse, 1sec, non-contact mode 6) laser treated using 200mJ/pulse, 5sec, non-contact mode 7) laser treated using l5OmJ/pulse, 1sec, contact mode with water irrigation 8) laser treated using 200mJ/pulse, 5sec, contact mode with water irrigation. All specimens were prepared for evaluation by scanning electron microscopy(SEM). Specimens from Group 2 exhibited a smear layer of scale like texture with parallel instrument tracks resulting from curet use. Specimens treated by contact mode, Group 3 and 4 featured surface changes not observed· in controls such as charring, randomly distributed pitting and crater formation, and melting down of the tooth material and calculus. Specimens treated by noncontact mode, Group 5 and 6 featured similar surface changes observed in contact mode. However, the differences between contact and non-contact groups not significant. Specimens treated by contact mode with water irrigation, Group 7 and 8 featured slight surface change compared to other groups. The results suggested that Nd: YAG laser did not completely remove the subgingival calculus but was possible the application as adjunctive method.

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Higher-mode effects for soil-structure systems under different components of near-fault ground motions

  • Khoshnoudian, Faramarz;Ahmadi, Ehsan;Sohrabi, Sina;Kiani, Mahdi
    • Earthquakes and Structures
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    • 제7권1호
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    • pp.83-99
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    • 2014
  • This study is devoted to estimate higher-mode effects for multi-story structures with considering soil-structure interaction subjected to decomposed parts of near-fault ground motions. The soil beneath the super-structure is simulated based on the Cone model concept. Two-dimensional structural models of 5, 15, and 25-story shear buildings are idealized by using nonlinear stick models. The ratio of base shears for the soil-MDOF structure system to those obtained from the equivalent soil-SDOF structure system is selected as an estimator to quantify the higher-mode effects. The results demonstrate that the trend of higher-mode effects is regular for pulse component and has a descending variation with respect to the pulse period, whereas an erratic pattern is obtained for high-frequency component. Moreover, the effect of pulse component on higher modes is more significant than high-frequency part for very short-period pulses and as the pulse period increases this phenomenon becomes vice-versa. SSI mechanism increases the higher-mode effects for both pulse and high-frequency components and slenderizing the super-structure amplifies such effects. Furthermore, for low story ductility ranges, increasing nonlinearity level leads to intensify the higher-mode effects; however, for high story ductility, such effects mitigates.

폐납축전지 재활용을 위한 펄스전류에 의한 전압조정기와 펄스충전기의 개발 (Development of Voltage Regulator and Pulse Charger Using Pulse Current for Reuse of the Waste Lead Acid Battery)

  • 신춘식;안영주;김동완
    • 전기학회논문지P
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    • 제56권2호
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    • pp.65-73
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    • 2007
  • In this study, the pulse charger and voltage regulator are proposed that can reuse the waste lead acid battery. The first we develop the voltage regulator that can reuse the waste lead battery. And the pulse current is applied to the terminal of the waste lead acid battery. The voltage regulator is available principle of the pulse current which can reduce the sulfate to incipient material such as Pb and PbO2. Therefore the internal resistance of the lead acid battery is decreased, the performance of the lead acid battery is improved and the durability is prolonged. The second we develop the pulse charger using the voltage regulator. The pulse charger uses the switch mode of the forward convert method. The pulse charger maintain the constant voltage in state removing the lead acid battery and when it connected the pulse charger, it is converted the charge mode of the constant current immediately. It continues the rapid charge until the full state of the lead acid battery. After that the pulse charger is converted to the charge mode of constant voltage automatically, and then it continues the normal charge. The experiment results show that the effectiveness of the voltage regulator and pulse charger such as the good performance and the prolonged durability in lead acid battery of the small and large capacity.