• 제목/요약/키워드: Charge comparison

검색결과 402건 처리시간 0.046초

Evaluation of a Fabricated Charge Sensitive Amplifier for a Semiconductor Radiation Detector

  • Kim, Han-Soo;Ha, Jang-Ho;Park, Se-Hwan;Lee, Jae-Hyung;Lee, Cheol-Ho
    • Journal of Radiation Protection and Research
    • /
    • 제35권2호
    • /
    • pp.81-84
    • /
    • 2010
  • A CSA(Charge Sensitive Amplifier) was designed and fabricated for application in a radiation detection system based on a semiconductor detector such as Si, SiC, CdZnTe and etc.. A fabricated hybrid.type CSA was evaluated by comparison with a commercially available CSA. A comparison was performed by using calculation of ENC (Equivalent Noise Charge) and by using energy resolutions of fabricated radiation detectors based on Si. In energy resolution comparison, a fabricated CSA showed almost the same performance compared with a commercial one. In this study, feasibility of a fabricated CSA was discussed.

Discrimination of neutrons and gamma-rays in plastic scintillator based on spiking cortical model

  • Bing-Qi Liu;Hao-Ran Liu;Lan Chang;Yu-Xin Cheng;Zhuo Zuo;Peng Li
    • Nuclear Engineering and Technology
    • /
    • 제55권9호
    • /
    • pp.3359-3366
    • /
    • 2023
  • In this study, a spiking cortical model (SCM) based n-g discrimination method is proposed. The SCM-based algorithm is compared with three other methods, namely: (i) the pulse-coupled neural network (PCNN), (ii) the charge comparison, and (iii) the zero-crossing. The objective evaluation criteria used for the comparison are the FoM-value and the time consumption of discrimination. Experimental results demonstrated that our proposed method outperforms the other methods significantly with the highest FoM-value. Specifically, the proposed method exhibits a 34.81% improvement compared with the PCNN, a 50.29% improvement compared with the charge comparison, and a 110.02% improvement compared with the zero-crossing. Additionally, the proposed method features the second-fastest discrimination time, where it is 75.67% faster than the PCNN, 70.65% faster than the charge comparison and 38.4% slower than the zero-crossing. Our study also discusses the role and change pattern of each parameter of the SCM to guide the selection process. It concludes that the SCM's outstanding ability to recognize the dynamic information in the pulse signal, improved accuracy when compared to the PCNN, and better computational complexity enables the SCM to exhibit excellent n-γ discrimination performance while consuming less time.

자기시스템의 Korteweg-Helmholtz 전자력 밀도와 자하 전자력 밀도의 비교 (Comparison of Korteweg-Helmholtz Electromagnetic Force Density and Magnetic Charge Force Density in Magnetic Systems)

  • 이세희;최명준;박일한
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제49권4호
    • /
    • pp.226-232
    • /
    • 2000
  • In magnetic systems, distribution of electromagnetic force density causes mechanical deformation, which results in noise and vibration. In this paper, Korteweg-Helmholtzs energy method and equivalent magnetic charge method are employed for comparison of their resulting distributions of force density. The force density from the Korteweg-Helmholtzs method is expresses with two Maxwell stresses on the inside and the outside fo magnetic material respectively. The other is calculated using the magnetic Coulombs law. In the numerical model of an electromagnet, their numerical results are compared. The distributions by the two methods are almost the same. And their total forces are also shown to be the same to the one calculated from the conventional Maxwell stress tensor. But the magnetic charge method is easier and more efficient in numerical calculation.

  • PDF

전기 자동차 배터리 충전 애플리케이션을 위한 무선 전력 전송 시스템의 CC/CV 충전의 구현 (Implementation of the CC/CV Charge of the Wireless Power Transfer System for Electric Vehicle Battery Charge Applications)

  • 부반빈;트란덕홍;팜반롱;최우진
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2015년도 추계학술대회 논문집
    • /
    • pp.25-26
    • /
    • 2015
  • Inductive Power Transfer (IPT) method becomes more and more popular for the Electric Vehicle (EV) battery charger due to its convenience and safety in comparison with plugged-in charger. In recent years, Lithium batteries are increasingly used in EVs and Constant Current/Constant Voltage (CC/CV) charge needs to be adopted for the high efficiency charge. However, it is not easy to design the IPT Battery Charger which can charge the battery with CC/CV charge under the wide range of load variation due to the wide range of variation in its operating frequency. This paper propose a new design and control method which makes it possible to implement the CC/CV mode charge with minimum frequency variation (less than 1kHz) during all over the charge process. A 6.6kW prototype charge has been implemented and 96.1% efficiency was achieved with 20cm air gap between the coils.

  • PDF

Comparison of Spray Characteristics between Conventional and Electrostatic Pressure-Swirl Nozzles

  • Laryea, G.N.;No, S.Y.
    • 한국분무공학회지
    • /
    • 제11권1호
    • /
    • pp.24-29
    • /
    • 2006
  • Spray characteristics produced by conventional and electrostatic pressure-swirl nozzles for an oil burner have been studied, using kerosine as a test liquid. The charge injection mechanism is used to design the electrostatic nozzle, where specific charge density, breakup length, spray angle and mean diameter are measured and analyzed. Three nozzles with orifice diameters of 0.256, 0.308 and 0.333mm at injection pressures of 0.7, 0.9, 1.1 and 1.3 MPa are used in the study. In case of the electrostatic nozzle, voltages ranging from -5 to -12kV are applied. Comparison of the spray characteristics is made between the conventional and electrostatic nozzles. The results showed that, the electrostatic nozzle is superior to the conventional nozzle. This is due the effect of voltage on the liquid surface tension.

  • PDF

Analysis of the Charge Controlled Inductor Current Sensing Peak-Power-Tracking Solar Array Regulator

  • Lee, K.S.;Cho, Y.J.;Cho, B.H.
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
    • /
    • pp.982-986
    • /
    • 1998
  • The peak-power-tracking solar array regulator sensing the inductor current is proposed. Since it uses the inductor current as the solar array output power information, the PPT control scheme can be greatly simplified. The charge controlled two-loop scheme is presented to improve the dynamics due to the inductor current sensing. The comparison between the single-voltage loop controlled system and the two-loop controlled system employing the charge control is presented. This paper also contains the simulation results of that comparison.

  • PDF

Comparison of Alpha Particle Signals with respect to Incident Direction onto n-Si:H pin diodes

  • Kim, Ho-Kyung;Gyuseong Cho;Hur, Woo-Sung;Lee, Wanno;Hong, Wan-Shick
    • 한국원자력학회:학술대회논문집
    • /
    • 한국원자력학회 1996년도 춘계학술발표회논문집(4)
    • /
    • pp.133-138
    • /
    • 1996
  • For the application of hydrogenated amorphous silicon (a-Si:H) p-i-n structural diode as the alpha particle spectroscopy, the induced charge collection was simulated based on a relevant non-uniform charge generation model. The simulation was accomplished for two extreme cases of the incident direction of alpha particle, p-and n-side, respectively. As expected, for the complete charge collection, the hole collection should be severely considered due to its poor mobility and the full depletion bias required. For the comparison of signal corresponding to the detector configuration or structure, although n-i-p configuration shows a wider range of linearity to the energy, p-i-n configuration is more suitable in the viewpoint of linearity and signal value for the considering energy range.

  • PDF

A Comparison of the Experiment Results and the Radical Degradation Pathways in PCE through Atomic Charge Calculation

  • Lee, Byung-Dae
    • 한국응용과학기술학회지
    • /
    • 제33권3호
    • /
    • pp.492-497
    • /
    • 2016
  • The intermediate product resulting from the radical degradation experiment of PCE and the atomic charge gained through Gaussian03W were compared against each other. The result was that the ratio of PCE radical degradation was almost 98% or higher after the 9 hr point in reaction time. The reaction speed constant was $0.16hr^{-1}$ and it followed the first reaction. We could see that at each location of the PCE molecule, dechlorination happened at a point where the negative atomic charge was the greatest. Moreover, the intermediate product of PCE radical degradation that was confirmed in the experiment and literature coincided exactly with the intermediate product in the atomic charge calculation. Therefore, when the atomic charge is calculated, the radical degradation pathway of the organic chlorine compound could be forecast.

전하 제어 비대칭 하프 브리지 직류-직류 컨버터의 소신호 모델링과 페루프 특성 해석 (Small-Signal Modeling and Closed-Loop Analysis of Charge Control Employed to Asymmetrical Half-Bridge Dc-to-Dc Converter)

  • 임원석;차헌녕;최병조
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2004년도 하계학술대회 논문집 B
    • /
    • pp.1151-1153
    • /
    • 2004
  • In this paper, small-signal modeling and closed-loop performance of charge control employed to an asymmetrical half-bridge (ASHB) dc-to-dc converters are investigated. The charge control is selected as an alternative to the conventional voltage-mode control and peak current-mode (PCM) control, which have their respective limitations and problems when adapted to ASHB dc-to-dc converters. The current-loop dynamics of the charge control are presented in comparison with those of voltage-mode and PCM control. This paper demonstrates that the charge control offers better dynamic performance compared to voltage-mode control and superior noise characteristics compared to PCM control. The potential problem of charge control are also addressed.

  • PDF

DC μ-Grid 기반 배터리 충/방전 시스템의 에너지 효율에 관한 연구 (A Study on Energy Efficiency of Battery Charge/Discharge System based on DC μ-Grid)

  • 여성대;김종운;이경량;한철규;류태형;김경화;김성권
    • 한국전자통신학회논문지
    • /
    • 제10권12호
    • /
    • pp.1337-1344
    • /
    • 2015
  • Li-ion 배터리를 생산하는데 있어서 충/방전을 통한 formation 과정이 필요하다. 이 과정에서 방전기의 부하 저항을 통해 방전하게 되는데 이때 에너지 손실이 발생한다. 따라서 본 논문에서는 DC ${\mu}-Grid$ 기반의 충/방전 시스템에서 배터리를 효율적으로 운영하는 방안에 대해 연구하였다. 컴퓨터 시뮬레이션 결과, DC ${\mu}-Grid$ 기반의 충/방전 시스템에서 충전 배터리 set 3개 기준 대비 방전 배터리 set의 수가 133%를 초과하게 되면 망 전압이 안정화되는 과정에서 발생하는 전압 fluctuation 폭을 초과하기 때문에 시스템에 치명적인 손상을 야기한다. 따라서 충전 배터리 set 3개 기준 대비 방전 배터리 set의 수를 133%까지 운영할 수 있으며 획기적인 에너지 절감 효과를 확인할 수 있었다.