Neural network analysis program for prediction of shelf life of soymilk by using electronic nose was developed. Known data of soymilk were used as database to learn the neural network system. Input pat- terns and target patterns were programmed for back propagation of learning algorithm. The input data- base was constructed from the determinations of volatile compounds in soymilk by using six sensors of the electronic nose at 5, 20, 35 and 50 o C during storage. After learning the input database by neural network system, the measured data of unknown sample by electronic nose were analyzed by the learned neural network analysis program for prediction of shelf life of soymilk. The correct probability which predicted shelf life of unknown soymilk samples were 97, 87, 97 and 67 percentages at 5, 20, 35 and 50 o C, respectively.
본 연구에서는 할랄 인증을 위한 고추장 중 에탄올 분석 시 1차 스크리닝 절차로서 전자코가 적용 가능한지를 알아보고자 하였다. 먼저 공인된 알코올 분석법인 GC-FID를 사용하여 25개의 재래식 고추장을 분석한 결과 모든 고추장에서 에탄올이 검출되었으며 그 함량은 0.14-2.7%이었다. 이 중 8개 고추장을 선별하여 전자코 분석한 결과, 에탄올 함량이 비슷한 고추장끼리 유사한 패턴을 나타내는 것을 확인하였다. 또한 시판 고추장 2개를 대상으로 전자코 분석을 통해 할랄 인증기관이 요구하는 에탄올 기준을 준수하는지를 1차적으로 신속하게 스크리닝이 가능함을 확인하였다. The purpose of this study was to investigate whether the electronic nose can be applied as a primary screening procedure to detect ethanol in gochujang for halal certification. First, ethanol content in 25 traditional gochujang was measured by gas chromatography with flame ion detector, widely accepted as the conventional method of alcohol detection. The content ranged from 0.14 to 2.7%. Then, 8 gochujangs selected from among the initial 25 samples were analyzed by electronic nose. Similar ethanol content patterns were observed between the two detection methods. In addition, commercial gochujang products were examined by electronic nose to ensure that they complied with the required ethanol standard of the halal certification authority. Consequently, it was confirmed that electronic nose analysis can be applied as a primary screening method for halal certification.
The objective of this study was to analyze the flavor patterns of commercial Korean distilled spirits using a mass spectrometry-based electronic nose and an electronic tongue. Thirteen types of domestic distilled spirits were used for analysis. The flavor patterns of the distilled spirits were clearly identified through discriminant function analysis of the raw materials. The obtained data of the electronic nose analysis showed that the flavor pattern of the distilled spirits aged in oak barrels was not significantly different from that of the general distilled spirits. According to the results of the electronic tongue, the distilled spirits made with rice had a stronger flavor than those made with foxtail millet. Compared to the sensitivity value of each taste sensor, the distilled spirits showed various intensities of sourness and umami. Therefore, an electronic nose and electronic tongue could be successfully used for quality evaluation and new product development of distilled spirits.
As the wireless power transfer (WPT) technology based on strongly resonance coupled method realizes large power charging without any wires through the air, there are advantages compared with the wired counterparts, such as convenient, safety and fearless transmission of power. From this reason, the WPT systems have started to be applied to the wireless charging for various power applications such as transportations (train, underwater ship, electric vehicle). Especially, in the case of high speed magnetic levitation (MAGLEV) train, The MAGLEV systems inherently have advantages in higher efficiency due to smaller air gap for wireless power transfer system between guidance and train. Even though it makes possible a convenient power charging system based on strong resonance coupling method, the transfer efficiency is limited structurally. This study aims for the design of inserted resonance coil (Sx) between antenna (Tx) and receiver (Rx) coils with high efficiency and stability in wireless power charging system for high speed MAGLEV train. In this study, authors described design methodology of inserted resonance coils to improve the efficiency for form of different sizes of Sx coil with radio frequency (RF) power of 370 kHz 400 W.
The wireless power transfer (WPT) using magnetic resonance coupling method has been known to have the advantage of being able to transfer power across large air gap with considerably high efficiency. As well as, as such a method can eliminate the physical contact loss in the system, it provides an ideal solution for the problem of contact losses in the power applications. Especially, since it is difficult to reduce the energy loss at connectors in the high temperature superconducting (HTS) magnet system, the WPT technology has been promisingly expected as a noble option to transfer electric power without physical contact from room temperature to very low temperature cooling vessel. From this point of view, authors proposed the combination WPT technology with HTS coils, it is called as, superconducting wireless power transfer (SUWPT) system. The SUWPT technique can be expected to solve the problem of the contact loss in the HTS joints, as well as, use with high levels of and low study, safety maintenance. In this authors examined transfer profiles between copper enameled antenna and HTS receiver coil with the usable frequency range at 13.56 MHz of RF power amplifier as long as the receiver is within 1.5 m distance under Styrofoam and stainless cooling vessels, respectively.
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