• Title/Summary/Keyword: analog behavioral model

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Behavioral Current-Voltage Model with Intermediate States for Unipolar Resistive Memories

  • Kim, Young Su;Min, Kyeong-Sik
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.13 no.6
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    • pp.539-545
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    • 2013
  • In this paper, a behavioral current-voltage model with intermediate states is proposed for analog applications of unipolar resistive memories, where intermediate resistance values between SET and RESET state are used to store analog data. In this model, SET and RESET behaviors are unified into one equation by the blending function and the percentage volume fraction of each region is modeled by the Johnson-Mehl-Avrami (JMA) equation that can describe the time-dependent phase transformation of unipolar memory. The proposed model is verified by the measured results of $TiO_2$ unipolar memory and tested by the SPECTRE circuit simulation with CMOS read and write circuits for unipolar resistive memories. With the proposed model, we also show that the behavioral model that combines the blending equation and JMA kinetics can universally describe not only unipolar memories but also bipolar ones. This universal behavioral model can be useful in practical applications, where various kinds of both unipolar and bipolar memories are being intensively studied, regardless of polarity of resistive memories.

OLED Analog Behavioral Modeling Based on Physics

  • Lee, Sang-Gun;Hattori, Reiji
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.431-434
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    • 2008
  • The physical OLED analog behavioral model for SPICE simulation has been described using Verilog-A language. The model is based on the carrier-balance between the hole and electron injected through Schottky barrier at anode and cathode. The accuracy of this model was examined by comparing with the results from device simulation.

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PSPICE Modeling of Commercial ICs for Switch-Mode Power Supply (SMPS) Design and Simulation

  • Yi, Yun-Jae;Yu, Yun-Seop
    • Journal of information and communication convergence engineering
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    • v.9 no.1
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    • pp.74-77
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    • 2011
  • PSPICE modeling of a commercial LED driver IC (TOP245P) and PC817A optocoupler is proposed for the switch-mode power supply (SMPS) (applicable to LED driver) design and simulation. An analog behavioral model of the TOP245P IC including the shunt regulator, under-voltage(UV) detection, over-voltage(OV) shut-down and SR flip-flop is developed by using PSPICE. The empirical equation of PC817A current transfer ratio (CTR) is fitted from the datasheet of PC817A. Two types of SMPSs are simulated with the averaged-model and switching-model. The simulation results by the proposed PSPICE models are in good agreement with those in the data sheet and an experimental data.

Derivation of Current-Voltage Equation for OLED using Device Simulation

  • Lee, Sang-Gun;Hattori, Reiji
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1212-1215
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    • 2009
  • The theoretical equations for J-V characteristics in an OLED was derived according to the internal carrier emission equation based on a diffusion model at Schottky barrier contact and the mobility equation based on the Pool-Frenkel model. The J-V characteristics of OLED are presented using a behavioral model for analog systems (Verilog-A language), and the accuracy of this model was verified by comparing with the device simulation results.

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Simulation &Analysis of Conducted EMI in Switched Mode Power Supplies (스위치 모드 파워 서플라이에서의 전도 전자파 장애의 시뮬레이션과 분석)

  • Lee, Dong-Young;Lee, Jae-Ho;Min, Seung-Hyeon;Cho, Bo-Hyung
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.3
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    • pp.122-129
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    • 2001
  • Exact simulation of conducted EMI in switched mode power supplies is proposed. In order to achieve exact simulation, PSPICE active component ABM model and modified transformer model are proposed. Each model parameter is extracted from measurements and data-books. PSPICE simulation results with high frequency PCB pattern model are accordant with EMI measurements for a 50[W] isolated flyback converter. EMI relations of each component and EMI patterns are analyzed.

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A Business Process Redesign Method within an ERP Framework (ERP 기반의 비즈니스 프로세스 재설계 방법)

  • Dong-Gill Jung
    • The Journal of Society for e-Business Studies
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    • v.7 no.1
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    • pp.87-106
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    • 2002
  • The behavioral and dynamic implications of an ERP implementation/installation are, to say the least, not well understood. Getting the switches set to enable the ERP software to go live is becoming straightforward. The really difficult part is understanding all of the dynamic interactions that accrue as a consequence. Dynamic causal and connectionist models are employed to facilitate an understanding of the dynamics and to enable control of the information-enhanced processes to take place. The connectionist model ran be analyzing (behind the scenes) the information accesses and transfers and coming If some conclusions about strong linkages that are getting established and what the behavioral implications of those new linkages and information accesses we. Ultimately, the connectionist model will come to an understanding of the dynamic, behavioral implications of the larger ERP implementation/installation per se. The underlying connectionist model will determine information transfers and workflow. Once a map of these two infrastructures is determined by the model, it becomes a relatively easy job for an analyst to suggest improvements in both. Connectionist models start with analog object structures and then use learning to produce mechanisms for managerial problem diagnoses. These mechanisms are neural models with multiple-layer structures that support continuous input/output. Based on earlier work performed and published by the author[10][11], a Connectionist ReasOning and LEarning System(CROLES) is developed that mimics the real-world reasoning infrastructure. Coupled with an explanation subsystem, this system can provide explanations as to why a particular reasoning structure behaved the way it did. Such a system operates in the backgmund, observing what is happening as every information access, every information response coming from each and every intelligent node (whether natural or artificial) operating within the ERP infrastructure is recorded and encoded. The CROLES is also able to transfer all workflows and map these onto the decision-making nodes of the organization.

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Pspice ABM MOSFET Model for Conducted EMI Analysis (전도 전자파 장애 분석을 위한 Pspice ABM MOSFET 모델)

  • Lee, J.H.;Lee, D.Y.;Cho, B.H.
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.1876-1878
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    • 1998
  • For an analysis and simulation of the conducted EMI of switching converters, an accurate simulation model for MOSFET is needed. This paper presents a new modeling approach, which incorporates DC output characteristics and AC dynamics especially the parasitic capacitances. It uses Pspice ABM(Analog Behavioral Model) and the MOSFET parameters can be obtained from the Data sheet in the frequency range of interest for EMI analysis. The model verified with an experimental setup and the EMI for a test converter is analyzed with respect to the MOSFET switching waveforms.

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Driver IC Modeling Technique for LED Driver Simulation (LED 드라이버 시뮬레이션을 위한 드라이버 IC 모델링 기법)

  • Yun, Jae-Yi;Choi, Bum-Ho;Yu, Yun-Seop
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.222-223
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    • 2010
  • TOP245P driver IC modeling technique are proposed for the LED Driver design. Analog behavioral model of TOP245P IC including the shunt regulator, under-voltage(UV) detection, over-voltage(OV) shut-down and SR flip-flop is developed by using PSPICE. The averaged-model and switching-model is applied to the LED driver simulation. The simulation results by the proposed TOP245P IC modeling technique are in good agreement with that in the data sheet and an experiment data.

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Dual mechanisms for the regulation of brain-derived neurotrophic factor by valproic acid in neural progenitor cells

  • Ko, Hyun Myung;Jin, Yeonsun;Park, Hyun Ho;Lee, Jong Hyuk;Jung, Seung Hyo;Choi, So Young;Lee, Sung Hoon;Shin, Chan Young
    • The Korean Journal of Physiology and Pharmacology
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    • v.22 no.6
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    • pp.679-688
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    • 2018
  • Autism spectrum disorders (ASDs) are neurodevelopmental disorders that share behavioral features, the results of numerous studies have suggested that the underlying causes of ASDs are multifactorial. Behavioral and/or neurobiological analyses of ASDs have been performed extensively using a valid model of prenatal exposure to valproic acid (VPA). Abnormal synapse formation resulting from altered neurite outgrowth in neural progenitor cells (NPCs) during embryonic brain development has been observed in both the VPA model and ASD subjects. Although several mechanisms have been suggested, the actual mechanism underlying enhanced neurite outgrowth remains unclear. In this study, we found that VPA enhanced the expression of brain-derived neurotrophic factor (BDNF), particularly mature BDNF (mBDNF), through dual mechanisms. VPA increased the mRNA and protein expression of BDNF by suppressing the nuclear expression of methyl-CpG-binding protein 2 (MeCP2), which is a transcriptional repressor of BDNF. In addition, VPA promoted the expression and activity of the tissue plasminogen activator (tPA), which induces BDNF maturation through proteolytic cleavage. Trichostatin A and sodium butyrate also enhanced tPA activity, but tPA activity was not induced by valpromide, which is a VPA analog that does not induce histone acetylation, indicating that histone acetylation activity was required for tPA regulation. VPA-mediated regulation of BDNF, MeCP2, and tPA was not observed in astrocytes or neurons. Therefore, these results suggested that VPA-induced mBDNF upregulation was associated with the dysregulation of MeCP2 and tPA in developing cortical NPCs.