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Jae Man Kim(김재만),Yoon Ho Choi(최윤호),Jin Bae Park(박진배) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, We present the wavelet neural network (WNN) controller as an active queue management(AQM) in end-to-end TCP network. AQM is important to regulate the queue length and short round trip time by passing or dropping the packets at the intermediate routers. As the role of AQM, the WNN controller adaptively controls the dropping probability of the TCP network and is trained by gradient-descent algorithm. We illustrate our result that WNN controller is superior to PI controller via simulations.
가솔린 직접 분사 기관에서 가변 밸브 타이밍 시스템에 의한 내부 유동 특성에 관한 수치 해석적 연구
김재만(Jae Man Kim),백두성(Doo Sung Baik),유승화(Seung Wha Yoo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This research on the characteristics of internal flow by variable valve timing system was simulated by a commercial Fluent code and an optimized shape of intake/exhaust port or valves was discussed. The simulation was made by various valve timings with respect to crank angles. Complicated flow was visualized inside a cylinder and this may provide fundamental data in designing lean burn engine in future.
휘발성 질소화합물 감응형 색변환 센서를 활용한 연어 신선도 모니터링
김재만 ( Jae Man Kim ),이현지 ( Hyeonji Lee ),현정호 ( Jung-ho Hyun ),박준식 ( Joon-shik Park ),김용신 ( Yong Shin Kim ) 한국센서학회 2020 센서학회지 Vol.29 No.2
A colorimetric paper sensor was used to detect volatile nitrogen-containing compounds emitted from spoiled salmon filets to determine their freshness. The sensing mechanism was based on acid-base reactions between acidic pH-indicating dyes and basic volatile ammonia and amines. A sensing layer was simply fabricated by drop-casting a dye solution of bromocresol green (BCG) on a polyvinylidene fluoride substrate, and its color-change response was enhanced by optimizing the amounts of additive chemicals, such as polyethylene glycol, p-toluene sulfonic acid, and graphene oxide in the dye solution. To avoid the adverse effects of water vapor, both faces of the sensing layer were enclosed by using a polyethylene terephthalate film and a gas-permeable microporous polytetrafluoroethylene sheet, respectively. When exposed to basic gas analytes, the paper-like sensor distinctly exhibited a color change from initially yellow, then to green, and finally to blue due to the deprotonation of BCG via the Brønsted acid-base reaction. The use of ammonia analyte as a test gas confirmed that the sensing performance of the optimized sensor was reversible and excellent (detection time of < 15 min, sensitive naked-eye detection at 0.25 ppm, good selectivity to common volatile organic gases, and good stability against thermal stress). Finally, the coloration intensity of the sensor was quantified as a function of the storage time of the salmon filet at 28°C to evaluate its usefulness in monitoring of the food freshness with the measurement of the total viable count (TVC) of microorganisms in the food. The TVC value increased from 3.2 × 10<sup>5</sup> to 3.1 × 10<sup>9</sup> cfu/g in 28 h and then became stable, whereas the sensor response abruptly changed in the first 8 h and slightly increased thereafter. This result suggests that the colorimetric response could be used as an indicator for evaluating the degree of decay of salmon induced by microorganisms.