• Korean Journal of Fisheries and Aquatic Sciences
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• v.22 no.4
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• pp.169-176
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• 1989

Volatile flavor components in powdered Katsuobushi were simultaneous trapped by steam distillation-extraction method, and these were fractionated into the neutral, the phenolic, the acidic and the basic fraction. Volatile flavor components in these fraction were analyzed by the high-resolution GC and GC-MS equipped with a fused silica capillary column. The whole steam volatile concentrate consisted of $48\%$ neutral fraction(NF), $35\%$ phenolic fraction(PF), $12\%$ acidic fraction(AF) and $5\%$ basic fraction(BF). Thirty components such as 8 hydrocarbons, 8 aldehydes, 6 furans, 5 alcohols and 3 ketones were identified from NF. And sixteen components such as phenol, guaiacol, dimethoxy phenol, eugenol in PF, twelve components such as propionic, butanoic, isopentanoic, n-hexanoic, heptanoic, octanoic acid in AF, ten components such as 2,6-dimethylpyrazine, 2-nethylpyridine, 2,4-dimethylthiaBole in BF were identified. NF and PF gave a much higher yield than others and were assumed to be indispensable for the reproduction of aroma of powdered Katsuobushi. It was also identified eight components of volatile carbonyl compounds such as ethanal, propanal, butanal, pentanal by 2,4-DNPH method.

• Applied Chemistry for Engineering
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• v.23 no.1
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• pp.100-104
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• 2012

Oligosaccharides production showed various biological activities in vivo like functional foods and industrial materials utilized available within many practical applications which have obtained from the degradation of alginate. Alginate is rich in the main component of seaweeds especially the brown algae. We investigated what degrading alginate from seaweeds to make alginate oligosaccharides can utilize in various fields using enzyme secreting Erwinia tasmaniensis. In this study, we observed an optimal culture condition of E. tasmaniensis, and characteristics of alginate lyase secreting E. tasmaniensis. These bacteria, E. tasmaniensis, were isolated from Nuruk. In this case, a suitable growth factor for E. tasmaniensis was culture it for 36 h in broth media on concentration of 1.0% (w/v) alginate. The enzyme showed the highest level of alginate lyase activity when cultured on broth media containing 1.0% (w/v) sodium alginate for 72 h. Optimal condition of pH, temperature and duration time for alginate lyase activity were found to be pH 6.0, $20^{\circ}C$ and 60 min, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.459-459
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• 2007

VHF ICP (Very High Frequency Inductively Coupled Plasma) 반응기에서 반응기 압력, 수증기 유량, 플라즈마 출력, 반응기온도 등의 공정변수에 따른 수증기 분해특성과 수소생성거동을 실험하였다. 플라즈마 분해 특성은 OES(Optical Emission Spectroscopy)를 사용하여 분석하였으며, QMS(Quadrapole Mass Spectroscopy)를 이용하여 배기가스 성분을 분석하여, 수증기 분해거동 및 수소생성 효율을 조사하였다. 본 연구실에서 설계한 초고주파 유도결합 플라즈마는 고밀도 플라즈마 생성과 낮은 압력에서도 안정된 플라즈마 발생 특징을 나타내었다. 플라즈마 출력의 증가에 따른 수증기의 분해와 수소생성 거동은 개시영역, 선형증가영역, 포화영역의 세 영역으로 구분되는 특징을 나타내었다. 유량 및 압력의 증가에 따라 포화에 필요한 플라즈마의 출력이 증가되는 경향을 나타내었다. 본 실험의 온도범위에서는 온도 증가에 따른 수증기 분해 및 수소생성 증가효과는 플라즈마 출력의 영향에 비하여 매우 미미한 정도로 플라즈마의 높은 에너지 전달효과를 확인할 수 있었다. 따라서, 낮은 반응기 온도에서도, 유량 및 압력에 따른 포화 플라즈마조건을 설정할 경우, 높은 에너지 효율의 수소 제조가 가능함을 알 수 있었으며, 물분해 플라즈마를 이용한 저온 산화물 박막증착에의 적용도 기대된다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.5 no.1
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• pp.29-38
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• 1972

The protein composition of abalone muscle was estimated with the following result: on a series of samples analyzed, water-soluble protein, $19\~22\%$, salt-soluble protein, $27\~39\%$: alkali-soluble protein, $20\~26\%$ : and stroma $20\~28\%$ : respectively. It was demonstrated by ultracentrifugal analysis that approximately $65\%$ of the salt-soluble protein is accounted for by paramyosin, $30\%$ by actomyosin, and $5\%$ by myosin, respectively. The ultracentrifugally homogenous paramyosin was prepared by BAILEY's ethanol-dried method. It showed a $S^{\circ}\;_{20,\;{\omega}$ of 3.14s, and was completely salted in with KCl beyond $0.35{\mu}$. The intrinsic viscosity at $25^{\circ}C$ was estimated at 3.1. The paramyosin is rich in several amino acids such as arginine, aspartic acid, glutamic acid, etc., and lacking of both proline and tryptophane, in rough accord with other paramyosins reported. The abalone paramyosin did not show ATPase activity over a pH range of 5 to 9,5 even in the presence of Ca++ or Mg++. So was the case with the paramyosin specimen prepared by BAILEY's wet-extraction method.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.4
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• pp.115-119
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• 2023

The natural language processing models used in current artificial intelligence are huge, causing various difficulties in processing and analyzing data in real time. In order to solve these difficulties, we proposed a method to improve the efficiency of processing by using less memory and checked the performance of the proposed model. The technique applied in this paper to evaluate the performance of the proposed model is to divide the large corpus by adjusting the number of attention heads and embedding size of the BERT[1] model to be small, and the results are calculated by averaging the output values of each forward. In this process, a random offset was assigned to the sentences at every epoch to provide diversity in the input data. The model was then fine-tuned for classification. We found that the split processing model was about 12% less accurate than the unsplit model, but the number of parameters in the model was reduced by 56%.

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.283-286
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• 2000

The effects of dissolved oxygen and pH on the cell growth and mass production of high-molecular weight pullulan by A. pullulans ATCC 42023 were evaluated. For the production of commercially useful pullulan with high-molecular weight, the influence of pH control on the pullulan production and growth of A. pullulans was studied in batch fermentation. It was found that the productivity of high-molecular weight pullulan with pH control at 6.5 was higher than that with no pH control. The influence of dissolved oxygen on the pullulan production and growth was studied. It was found that pullulan yield and synthesis rate increased with oxygen availability.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.4
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• pp.370-376
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• 2000

In this paper, a communication system that is not using the communication line but power line is presented. It will be very useful for an information-oriented society with tele-metering and home automation. Conventional system has a difficulty in transmitting information due to decreasing communication voltage and increasing carrier current. Proposed idea is a special type switching amplifier system which has a low inner resistance. It can provide reactive power and does not have low impedance between the transceivers. This new system is proposed to overcome the loss of conductor load in a PLC system.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.05a
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• pp.150-155
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• 2010

Liquid rocket injectors play crucial roles on propulsive performance, combustion stability, and heat transfer characteristics. Nevertheless, their developments have mainly relied on empirical methods and expensive hot-firing tests due to lack of fundamental understanding of high pressure combustion phenomena in the near-injector regions. The present study was motivated by recent efforts to develop reliable modeling of liquid rocket combustion. The turbulent combustion model based on the flamelet concept has been extended to take into account real-fluid behaviors occurred at supercritical pressures, and validated against measurements for a cryogenic nitrogen injection, a non-premixed turbulent jet flame at atmospheric pressure, and a LOx/$GH_2$ coaxial shear injector at a supercritical pressure.

• Korean Chemical Engineering Research
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• v.56 no.1
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• pp.61-65
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• 2018

In this study, the conversion of glucosamine, which is a major monomer in chitin/chitosan of crustacean shell, using solid acid catalyst was performed to obtain chemical intermediates such as levulinic acid and 5-hydroxymethyl furfural (5-HMF). The conversion reaction was optimized with four reaction factors of selection of ionic resin catalyst, reaction temperature, catalyst amount, and reaction time. As an optimized result, the highest levulinic acid yield was achieved approximately 36.86% under the determined conditions (Amberlyst 15 as a solid-acid catalyst, $180^{\circ}C$, 5% catalyst amount and 60 min). On the other hand, 5-HMF yield was found to be 0.91% at the condition.

• Journal of Korean Theatre Studies Association
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• no.53
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• pp.57-87
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• 2014

This article re-reads the messages of the text, 'Incendies', the uncanny actions and the strange words of protagonist Nawal, through the ideas of Jacques Lacan, particularly his notion of sexuation with posing questions about most of the previous reviews which are based on femininity or motherhood. For Lacan, masculinity and femininity are not biological essences but symbolic positions, and the assumption of one of these two positions is fundamental to the construction of subjectivity. So 'man' and 'woman' are merely signifiers that stand for these two subjective positions. Each side is defined by both an affirmation and a negation of the phallic function, by both an inclusion and exclusion of absolute non-phallic jouissance. Unlike the man, the woman is 'not-all' identified with the phallic function, demonstrating the undecidability and impossibility of totalising the woman. Although the woman is bound to do castration through being subject to the phallic function, she is also related to the signifier of the barred Other, S(Ⱥ) which stands for a gap or lack in the Other. Thus, as a consequence of not being entirely within the symbolic, she has an Other Jouissance, Feminine Jouissance, because it's possible to face emptiness of the Symbolic, the Real only in the place of the woman for new Ethics/Politics. This paper finds that Nawal is not completely defined by the phallic function and she is a subject of death drive that practices the signifying cut with passing through the fantasy as a screen for the desire of the Other. Nawal is situated on the position of the woman as 'not-all' unlike masculinity in Lacanian sexuation. This article shows that her strange acts are love, that is the true ethical acts. Above all her acts are related to the ethics of pure desire beyond the ethics of the Good of Aristotle. In that sense the character of Nawal of 'Incendies' is similar to the one of 'Antigone' as a character in all aspects. In psychoanalysis they all are true subjects that face a void, emptiness in a symbolic structure. They assume underlying impossibility of being/the Symbolic. They don't represent the images of compromise and peace in the normally accepted meaning of the word. A love that they show is not compassion but blind recognition of the excluded, embracing uniqueness of the excluded. This thesis finds resultingly Nawal's acts which can't be understood from viewpoint of feminism practice the ethics of the real, the politics of the real.