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High accuracy, Low Power Spread Spectrum Clock Generator to Reduce EMI for Automotive Applications
Lee, Dongsoo,Choi, Jinwook,Oh, Seongjin,Kim, SangYun,Lee, Kang-Yoon The Institute of Electronics and Information Engin 2014 IEIE Transactions on Smart Processing & Computing Vol.3 No.6
This paper presents a Spread Spectrum Clock Generator (SSCG) based on Relaxation oscillator using Up/Down Counter. The current is controlled by a counter and the spread spectrum of the Relaxation Oscillator. A Relaxation Oscillator with temperature compensation using the BGR and ADC is presented. The current to determine the frequency of the Relaxation Oscillator can be controlled. The output frequency of the temperature can be compensated by adjusting the current according to the temperature using the code that is the output from the ADC and BGR. EMI Reduction of SSCG is 11 dB, and Spread down frequency is 150 kHz. The current consumption is $600{\mu}A$ from 5V and the operating frequency is from 2.3 MHz to 5.75 MHz. The rate of change of the output frequency with temperature was approximately ${\pm}1%$. The SSCG is fabricated in a 0.35um CMOS process with active area $250um{\times}440um$.
Effect of 42 amino acid long amyloid-β peptides on Arabidopsis plants
Lee, HanGyeol,Kim, Ji Woo,Jeong, Sangyun,An, Jungeun,Kim, Young-Cheon,Ryu, Hojin,Lee, Jeong Hwan The Korean Society of Plant Biotechnology 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.4
Although the evolution of Arabidopsis thaliana and humans diverged approximately 1.6 billion years ago, recent studies have demonstrated that protein function and cellular processes involved in disease response remain remarkably conserved. Particularly, γ-secretase, a multisubunit protein complex that participates in intramembrane proteolysis (RIP) regulation, is also known to mediate the cleavage of more than 80 substrates including the amyloid precursor protein (APP) and the Notch receptor. Although the genes (PS1/2, APH-1, PEN-2, and NCT) coding for the γ-secretase complex components are present in plant genomes, their function remains largely uncharacterized. Given that the deposition of 42 amino acid long amyloid-β peptides (hAβ<sub>42</sub>) is thought to be one of the main causes of Alzheimer's disease, we aimed to examine the physiological effects of hAβ<sub>42</sub> peptides on plants. Interestingly, we found that Arabidopsis protoplast death increased after 24 h of exposure to 3 or 5 µM hAβ<sub>42</sub> peptides. Furthermore, transgenic Arabidopsis plants overexpressing the hAβ<sub>42</sub> gene exhibited changes in primary root length and silique phyllotaxy. Taken together, our results demonstrate that hAβ<sub>42</sub> peptides, a metazoan protein, significantly affect Arabidopsis protoplast viability and plant morphology.
Validation of an Acoustic Finite Element Model of an Automobile Passenger Compartment
Sangyun Lee(이상윤),Joohyung Lee(이주형),Kwangseo Park(박광서),Youngho Kim(김영호) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
An acoustic finite-element model of an automobile passenger compartment that represents the more complicated vehicle interior acoustic characteristics is developed and experimentally assessed using loudspeaker excitation. The acoustic finite-element model represents the passenger compartment cavity, trunk compartment cavity, front and rear seats, parcel shelf, door volumes, and IP (Instrument Panel) volume. The model accounts for the coupling between the compartment cavity and trunk cavity through the rear seat and parcel shelf, and the coupling between the compartment cavity and the door and IP panel volumes. Modal analysis tests of a vehicle were conducted using loudspeaker excitation to identify the compartment cavity modes and sound pressure response at a large number of interior locations. Comparisons of the predicted versus measured mode frequencies, mode shapes, and sound pressure response at the occupant ear locations are made to assess the accuracy of the model to 400 Hz.